*
* Copyright (C) 2004 Dmitry Yusupov
* Copyright (C) 2004 Alex Aizman
- * Copyright (C) 2005 Mike Christie
+ * Copyright (C) 2005 - 2006 Mike Christie
+ * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
* maintained by open-iscsi@googlegroups.com
*
* This program is free software; you can redistribute it and/or modify
*/
#include <linux/types.h>
-#include <linux/list.h>
#include <linux/inet.h>
+#include <linux/slab.h>
+#include <linux/file.h>
#include <linux/blkdev.h>
#include <linux/crypto.h>
#include <linux/delay.h>
#include <linux/kfifo.h>
#include <linux/scatterlist.h>
-#include <linux/mutex.h>
#include <net/tcp.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
-#include <scsi/scsi_eh.h>
-#include <scsi/scsi_request.h>
-#include <scsi/scsi_tcq.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi.h>
#include <scsi/scsi_transport_iscsi.h>
#include "iscsi_tcp.h"
-MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
+MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
+ "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
"Alex Aizman <itn780@yahoo.com>");
MODULE_DESCRIPTION("iSCSI/TCP data-path");
MODULE_LICENSE("GPL");
-MODULE_VERSION("0:4.445");
-/* #define DEBUG_TCP */
-/* #define DEBUG_SCSI */
-#define DEBUG_ASSERT
-
-#ifdef DEBUG_TCP
-#define debug_tcp(fmt...) printk(KERN_DEBUG "tcp: " fmt)
-#else
-#define debug_tcp(fmt...)
-#endif
-
-#ifdef DEBUG_SCSI
-#define debug_scsi(fmt...) printk(KERN_DEBUG "scsi: " fmt)
-#else
-#define debug_scsi(fmt...)
-#endif
-
-#ifndef DEBUG_ASSERT
-#ifdef BUG_ON
-#undef BUG_ON
-#endif
-#define BUG_ON(expr)
-#endif
-
-#define INVALID_SN_DELTA 0xffff
-static unsigned int iscsi_max_lun = 512;
-module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
-
-/* global data */
-static kmem_cache_t *taskcache;
-
-static inline void
-iscsi_buf_init_virt(struct iscsi_buf *ibuf, char *vbuf, int size)
-{
- sg_init_one(&ibuf->sg, (u8 *)vbuf, size);
- ibuf->sent = 0;
- ibuf->use_sendmsg = 0;
-}
-
-static inline void
-iscsi_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
-{
- ibuf->sg.page = virt_to_page(vbuf);
- ibuf->sg.offset = offset_in_page(vbuf);
- ibuf->sg.length = size;
- ibuf->sent = 0;
- ibuf->use_sendmsg = 1;
-}
-
-static inline void
-iscsi_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
-{
- ibuf->sg.page = sg->page;
- ibuf->sg.offset = sg->offset;
- ibuf->sg.length = sg->length;
- /*
- * Fastpath: sg element fits into single page
- */
- if (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg->page))
- ibuf->use_sendmsg = 0;
- else
- ibuf->use_sendmsg = 1;
- ibuf->sent = 0;
-}
-
-static inline int
-iscsi_buf_left(struct iscsi_buf *ibuf)
-{
- int rc;
-
- rc = ibuf->sg.length - ibuf->sent;
- BUG_ON(rc < 0);
- return rc;
-}
-
-static inline void
-iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
- u8* crc)
-{
- crypto_digest_digest(conn->tx_tfm, &buf->sg, 1, crc);
- buf->sg.length += sizeof(uint32_t);
-}
-
-static void
-iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
-{
- struct iscsi_session *session = conn->session;
- unsigned long flags;
-
- spin_lock_irqsave(&session->lock, flags);
- if (session->conn_cnt == 1 || session->leadconn == conn)
- session->state = ISCSI_STATE_FAILED;
- spin_unlock_irqrestore(&session->lock, flags);
- set_bit(SUSPEND_BIT, &conn->suspend_tx);
- set_bit(SUSPEND_BIT, &conn->suspend_rx);
- iscsi_conn_error(iscsi_handle(conn), err);
-}
-
-static inline int
-iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
-{
- uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
- uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
-
- if (max_cmdsn < exp_cmdsn -1 &&
- max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
- return ISCSI_ERR_MAX_CMDSN;
- if (max_cmdsn > session->max_cmdsn ||
- max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
- session->max_cmdsn = max_cmdsn;
- if (exp_cmdsn > session->exp_cmdsn ||
- exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
- session->exp_cmdsn = exp_cmdsn;
-
- return 0;
-}
-
-static inline int
-iscsi_hdr_extract(struct iscsi_conn *conn)
-{
- struct sk_buff *skb = conn->in.skb;
-
- if (conn->in.copy >= conn->hdr_size &&
- conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
- /*
- * Zero-copy PDU Header: using connection context
- * to store header pointer.
- */
- if (skb_shinfo(skb)->frag_list == NULL &&
- !skb_shinfo(skb)->nr_frags)
- conn->in.hdr = (struct iscsi_hdr *)
- ((char*)skb->data + conn->in.offset);
- else {
- /* ignoring return code since we checked
- * in.copy before */
- skb_copy_bits(skb, conn->in.offset,
- &conn->hdr, conn->hdr_size);
- conn->in.hdr = &conn->hdr;
- }
- conn->in.offset += conn->hdr_size;
- conn->in.copy -= conn->hdr_size;
- } else {
- int hdr_remains;
- int copylen;
-
- /*
- * PDU header scattered across SKB's,
- * copying it... This'll happen quite rarely.
- */
-
- if (conn->in_progress == IN_PROGRESS_WAIT_HEADER)
- conn->in.hdr_offset = 0;
-
- hdr_remains = conn->hdr_size - conn->in.hdr_offset;
- BUG_ON(hdr_remains <= 0);
-
- copylen = min(conn->in.copy, hdr_remains);
- skb_copy_bits(skb, conn->in.offset,
- (char*)&conn->hdr + conn->in.hdr_offset, copylen);
-
- debug_tcp("PDU gather offset %d bytes %d in.offset %d "
- "in.copy %d\n", conn->in.hdr_offset, copylen,
- conn->in.offset, conn->in.copy);
-
- conn->in.offset += copylen;
- conn->in.copy -= copylen;
- if (copylen < hdr_remains) {
- conn->in_progress = IN_PROGRESS_HEADER_GATHER;
- conn->in.hdr_offset += copylen;
- return -EAGAIN;
- }
- conn->in.hdr = &conn->hdr;
- conn->discontiguous_hdr_cnt++;
- conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- }
-
- return 0;
-}
-
-static inline void
-iscsi_ctask_cleanup(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct scsi_cmnd *sc = ctask->sc;
- struct iscsi_session *session = conn->session;
-
- spin_lock(&session->lock);
- if (unlikely(!sc)) {
- spin_unlock(&session->lock);
- return;
- }
- if (sc->sc_data_direction == DMA_TO_DEVICE) {
- struct iscsi_data_task *dtask, *n;
- /* WRITE: cleanup Data-Out's if any */
- spin_lock(&conn->lock);
- list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
- list_del(&dtask->item);
- mempool_free(dtask, ctask->datapool);
- }
- spin_unlock(&conn->lock);
- }
- ctask->xmstate = XMSTATE_IDLE;
- ctask->r2t = NULL;
- ctask->sc = NULL;
- __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
- spin_unlock(&session->lock);
-}
-
-/**
- * iscsi_cmd_rsp - SCSI Command Response processing
- * @conn: iscsi connection
- * @ctask: scsi command task
- **/
-static int
-iscsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- int rc;
- struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)conn->in.hdr;
- struct iscsi_session *session = conn->session;
- struct scsi_cmnd *sc = ctask->sc;
-
- rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
- if (rc) {
- sc->result = (DID_ERROR << 16);
- goto out;
- }
-
- conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
-
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
-
- if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
- sc->result = (DID_ERROR << 16);
- goto out;
- }
-
- if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION && conn->senselen) {
- int sensecopy = min(conn->senselen, SCSI_SENSE_BUFFERSIZE);
-
- memcpy(sc->sense_buffer, conn->data + 2, sensecopy);
- debug_scsi("copied %d bytes of sense\n", sensecopy);
- }
-
- if (sc->sc_data_direction == DMA_TO_DEVICE)
- goto out;
-
- if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
- int res_count = be32_to_cpu(rhdr->residual_count);
-
- if (res_count > 0 && res_count <= sc->request_bufflen)
- sc->resid = res_count;
- else
- sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
- } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
- sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
- else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
- sc->resid = be32_to_cpu(rhdr->residual_count);
-
-out:
- debug_scsi("done [sc %lx res %d itt 0x%x]\n",
- (long)sc, sc->result, ctask->itt);
- conn->scsirsp_pdus_cnt++;
- iscsi_ctask_cleanup(conn, ctask);
- sc->scsi_done(sc);
- return rc;
-}
-
-/**
- * iscsi_data_rsp - SCSI Data-In Response processing
- * @conn: iscsi connection
- * @ctask: scsi command task
- **/
-static int
-iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- int rc;
- struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)conn->in.hdr;
- struct iscsi_session *session = conn->session;
- int datasn = be32_to_cpu(rhdr->datasn);
-
- rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
- if (rc)
- return rc;
- /*
- * setup Data-In byte counter (gets decremented..)
- */
- ctask->data_count = conn->in.datalen;
-
- if (conn->in.datalen == 0)
- return 0;
-
- if (ctask->datasn != datasn)
- return ISCSI_ERR_DATASN;
-
- ctask->datasn++;
-
- ctask->data_offset = be32_to_cpu(rhdr->offset);
- if (ctask->data_offset + conn->in.datalen > ctask->total_length)
- return ISCSI_ERR_DATA_OFFSET;
-
- if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
- struct scsi_cmnd *sc = ctask->sc;
-
- conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
- if (rhdr->flags & ISCSI_FLAG_DATA_UNDERFLOW) {
- int res_count = be32_to_cpu(rhdr->residual_count);
-
- if (res_count > 0 &&
- res_count <= sc->request_bufflen) {
- sc->resid = res_count;
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
- } else
- sc->result = (DID_BAD_TARGET << 16) |
- rhdr->cmd_status;
- } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) {
- sc->resid = be32_to_cpu(rhdr->residual_count);
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
- } else
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
- }
-
- conn->datain_pdus_cnt++;
- return 0;
-}
-
-/**
- * iscsi_solicit_data_init - initialize first Data-Out
- * @conn: iscsi connection
- * @ctask: scsi command task
- * @r2t: R2T info
- *
- * Notes:
- * Initialize first Data-Out within this R2T sequence and finds
- * proper data_offset within this SCSI command.
- *
- * This function is called with connection lock taken.
- **/
-static void
-iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct iscsi_r2t_info *r2t)
-{
- struct iscsi_data *hdr;
- struct iscsi_data_task *dtask;
- struct scsi_cmnd *sc = ctask->sc;
-
- dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
- BUG_ON(!dtask);
- hdr = &dtask->hdr;
- memset(hdr, 0, sizeof(struct iscsi_data));
- hdr->ttt = r2t->ttt;
- hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
- r2t->solicit_datasn++;
- hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
- memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
- hdr->itt = ctask->hdr.itt;
- hdr->exp_statsn = r2t->exp_statsn;
- hdr->offset = cpu_to_be32(r2t->data_offset);
- if (r2t->data_length > conn->max_xmit_dlength) {
- hton24(hdr->dlength, conn->max_xmit_dlength);
- r2t->data_count = conn->max_xmit_dlength;
- hdr->flags = 0;
- } else {
- hton24(hdr->dlength, r2t->data_length);
- r2t->data_count = r2t->data_length;
- hdr->flags = ISCSI_FLAG_CMD_FINAL;
- }
- conn->dataout_pdus_cnt++;
-
- r2t->sent = 0;
-
- iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
- sizeof(struct iscsi_hdr));
-
- r2t->dtask = dtask;
-
- if (sc->use_sg) {
- int i, sg_count = 0;
- struct scatterlist *sg = sc->request_buffer;
-
- r2t->sg = NULL;
- for (i = 0; i < sc->use_sg; i++, sg += 1) {
- /* FIXME: prefetch ? */
- if (sg_count + sg->length > r2t->data_offset) {
- int page_offset;
-
- /* sg page found! */
-
- /* offset within this page */
- page_offset = r2t->data_offset - sg_count;
-
- /* fill in this buffer */
- iscsi_buf_init_sg(&r2t->sendbuf, sg);
- r2t->sendbuf.sg.offset += page_offset;
- r2t->sendbuf.sg.length -= page_offset;
-
- /* xmit logic will continue with next one */
- r2t->sg = sg + 1;
- break;
- }
- sg_count += sg->length;
- }
- BUG_ON(r2t->sg == NULL);
- } else
- iscsi_buf_init_iov(&ctask->sendbuf,
- (char*)sc->request_buffer + r2t->data_offset,
- r2t->data_count);
-
- list_add(&dtask->item, &ctask->dataqueue);
-}
-
-/**
- * iscsi_r2t_rsp - iSCSI R2T Response processing
- * @conn: iscsi connection
- * @ctask: scsi command task
- **/
-static int
-iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_r2t_info *r2t;
- struct iscsi_session *session = conn->session;
- struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)conn->in.hdr;
- int r2tsn = be32_to_cpu(rhdr->r2tsn);
- int rc;
-
- if (conn->in.ahslen)
- return ISCSI_ERR_AHSLEN;
-
- if (conn->in.datalen)
- return ISCSI_ERR_DATALEN;
-
- if (ctask->exp_r2tsn && ctask->exp_r2tsn != r2tsn)
- return ISCSI_ERR_R2TSN;
-
- rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
- if (rc)
- return rc;
-
- /* FIXME: use R2TSN to detect missing R2T */
-
- /* fill-in new R2T associated with the task */
- spin_lock(&session->lock);
- if (!ctask->sc || ctask->mtask ||
- session->state != ISCSI_STATE_LOGGED_IN) {
- printk(KERN_INFO "iscsi_tcp: dropping R2T itt %d in "
- "recovery...\n", ctask->itt);
- spin_unlock(&session->lock);
- return 0;
- }
- rc = __kfifo_get(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
- BUG_ON(!rc);
-
- r2t->exp_statsn = rhdr->statsn;
- r2t->data_length = be32_to_cpu(rhdr->data_length);
- if (r2t->data_length == 0 ||
- r2t->data_length > session->max_burst) {
- spin_unlock(&session->lock);
- return ISCSI_ERR_DATALEN;
- }
-
- r2t->data_offset = be32_to_cpu(rhdr->data_offset);
- if (r2t->data_offset + r2t->data_length > ctask->total_length) {
- spin_unlock(&session->lock);
- return ISCSI_ERR_DATALEN;
- }
-
- r2t->ttt = rhdr->ttt; /* no flip */
- r2t->solicit_datasn = 0;
-
- iscsi_solicit_data_init(conn, ctask, r2t);
-
- ctask->exp_r2tsn = r2tsn + 1;
- ctask->xmstate |= XMSTATE_SOL_HDR;
- __kfifo_put(ctask->r2tqueue, (void*)&r2t, sizeof(void*));
- __kfifo_put(conn->writequeue, (void*)&ctask, sizeof(void*));
-
- scsi_queue_work(session->host, &conn->xmitwork);
- conn->r2t_pdus_cnt++;
- spin_unlock(&session->lock);
-
- return 0;
-}
-
-static int
-iscsi_hdr_recv(struct iscsi_conn *conn)
-{
- int rc = 0;
- struct iscsi_hdr *hdr;
- struct iscsi_cmd_task *ctask;
- struct iscsi_session *session = conn->session;
- uint32_t cdgst, rdgst = 0;
-
- hdr = conn->in.hdr;
-
- /* verify PDU length */
- conn->in.datalen = ntoh24(hdr->dlength);
- if (conn->in.datalen > conn->max_recv_dlength) {
- printk(KERN_ERR "iscsi_tcp: datalen %d > %d\n",
- conn->in.datalen, conn->max_recv_dlength);
- return ISCSI_ERR_DATALEN;
- }
- conn->data_copied = 0;
-
- /* read AHS */
- conn->in.ahslen = hdr->hlength * 4;
- conn->in.offset += conn->in.ahslen;
- conn->in.copy -= conn->in.ahslen;
- if (conn->in.copy < 0) {
- printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
- "%d bytes\n", conn->in.ahslen);
- return ISCSI_ERR_AHSLEN;
- }
-
- /* calculate read padding */
- conn->in.padding = conn->in.datalen & (ISCSI_PAD_LEN-1);
- if (conn->in.padding) {
- conn->in.padding = ISCSI_PAD_LEN - conn->in.padding;
- debug_scsi("read padding %d bytes\n", conn->in.padding);
- }
-
- if (conn->hdrdgst_en) {
- struct scatterlist sg;
-
- sg_init_one(&sg, (u8 *)hdr,
- sizeof(struct iscsi_hdr) + conn->in.ahslen);
- crypto_digest_digest(conn->rx_tfm, &sg, 1, (u8 *)&cdgst);
- rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
- conn->in.ahslen);
- if (cdgst != rdgst) {
- printk(KERN_ERR "iscsi_tcp: itt %x: hdrdgst error "
- "recv 0x%x calc 0x%x\n", conn->in.itt, rdgst,
- cdgst);
- return ISCSI_ERR_HDR_DGST;
- }
- }
-
- /* save opcode for later */
- conn->in.opcode = hdr->opcode & ISCSI_OPCODE_MASK;
-
- /* verify itt (itt encoding: age+cid+itt) */
- if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
- if ((hdr->itt & AGE_MASK) !=
- (session->age << AGE_SHIFT)) {
- printk(KERN_ERR "iscsi_tcp: received itt %x expected "
- "session age (%x)\n", hdr->itt,
- session->age & AGE_MASK);
- return ISCSI_ERR_BAD_ITT;
- }
-
- if ((hdr->itt & CID_MASK) != (conn->id << CID_SHIFT)) {
- printk(KERN_ERR "iscsi_tcp: received itt %x, expected "
- "CID (%x)\n", hdr->itt, conn->id);
- return ISCSI_ERR_BAD_ITT;
- }
- conn->in.itt = hdr->itt & ITT_MASK;
- } else
- conn->in.itt = hdr->itt;
-
- debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
- hdr->opcode, conn->in.offset, conn->in.copy,
- conn->in.ahslen, conn->in.datalen);
-
- if (conn->in.itt < session->cmds_max) {
- ctask = (struct iscsi_cmd_task *)session->cmds[conn->in.itt];
-
- if (!ctask->sc) {
- printk(KERN_INFO "iscsi_tcp: dropping ctask with "
- "itt 0x%x\n", ctask->itt);
- conn->in.datalen = 0; /* force drop */
- return 0;
- }
-
- if (ctask->sc->SCp.phase != session->age) {
- printk(KERN_ERR "iscsi_tcp: ctask's session age %d, "
- "expected %d\n", ctask->sc->SCp.phase,
- session->age);
- return ISCSI_ERR_SESSION_FAILED;
- }
-
- conn->in.ctask = ctask;
-
- debug_scsi("rsp [op 0x%x cid %d sc %lx itt 0x%x len %d]\n",
- hdr->opcode, conn->id, (long)ctask->sc,
- ctask->itt, conn->in.datalen);
-
- switch(conn->in.opcode) {
- case ISCSI_OP_SCSI_CMD_RSP:
- BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
- if (!conn->in.datalen)
- rc = iscsi_cmd_rsp(conn, ctask);
- else
- /*
- * got sense or response data; copying PDU
- * Header to the connection's header
- * placeholder
- */
- memcpy(&conn->hdr, hdr,
- sizeof(struct iscsi_hdr));
- break;
- case ISCSI_OP_SCSI_DATA_IN:
- BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
- /* save flags for non-exceptional status */
- conn->in.flags = hdr->flags;
- /* save cmd_status for sense data */
- conn->in.cmd_status =
- ((struct iscsi_data_rsp*)hdr)->cmd_status;
- rc = iscsi_data_rsp(conn, ctask);
- break;
- case ISCSI_OP_R2T:
- BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
- if (ctask->sc->sc_data_direction == DMA_TO_DEVICE)
- rc = iscsi_r2t_rsp(conn, ctask);
- else
- rc = ISCSI_ERR_PROTO;
- break;
- default:
- rc = ISCSI_ERR_BAD_OPCODE;
- break;
- }
- } else if (conn->in.itt >= ISCSI_MGMT_ITT_OFFSET &&
- conn->in.itt < ISCSI_MGMT_ITT_OFFSET +
- session->mgmtpool_max) {
- struct iscsi_mgmt_task *mtask = (struct iscsi_mgmt_task *)
- session->mgmt_cmds[conn->in.itt -
- ISCSI_MGMT_ITT_OFFSET];
-
- debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
- conn->in.opcode, conn->id, mtask->itt,
- conn->in.datalen);
-
- switch(conn->in.opcode) {
- case ISCSI_OP_LOGIN_RSP:
- case ISCSI_OP_TEXT_RSP:
- case ISCSI_OP_LOGOUT_RSP:
- rc = iscsi_check_assign_cmdsn(session,
- (struct iscsi_nopin*)hdr);
- if (rc)
- break;
-
- if (!conn->in.datalen) {
- rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
- NULL, 0);
- if (conn->login_mtask != mtask) {
- spin_lock(&session->lock);
- __kfifo_put(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*));
- spin_unlock(&session->lock);
- }
- }
- break;
- case ISCSI_OP_SCSI_TMFUNC_RSP:
- rc = iscsi_check_assign_cmdsn(session,
- (struct iscsi_nopin*)hdr);
- if (rc)
- break;
-
- if (conn->in.datalen || conn->in.ahslen) {
- rc = ISCSI_ERR_PROTO;
- break;
- }
- conn->tmfrsp_pdus_cnt++;
- spin_lock(&session->lock);
- if (conn->tmabort_state == TMABORT_INITIAL) {
- __kfifo_put(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*));
- conn->tmabort_state =
- ((struct iscsi_tm_rsp *)hdr)->
- response == ISCSI_TMF_RSP_COMPLETE ?
- TMABORT_SUCCESS:TMABORT_FAILED;
- /* unblock eh_abort() */
- wake_up(&conn->ehwait);
- }
- spin_unlock(&session->lock);
- break;
- case ISCSI_OP_NOOP_IN:
- if (hdr->ttt != ISCSI_RESERVED_TAG) {
- rc = ISCSI_ERR_PROTO;
- break;
- }
- rc = iscsi_check_assign_cmdsn(session,
- (struct iscsi_nopin*)hdr);
- if (rc)
- break;
- conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
-
- if (!conn->in.datalen) {
- struct iscsi_mgmt_task *mtask;
-
- rc = iscsi_recv_pdu(iscsi_handle(conn), hdr,
- NULL, 0);
- mtask = (struct iscsi_mgmt_task *)
- session->mgmt_cmds[conn->in.itt -
- ISCSI_MGMT_ITT_OFFSET];
- if (conn->login_mtask != mtask) {
- spin_lock(&session->lock);
- __kfifo_put(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*));
- spin_unlock(&session->lock);
- }
- }
- break;
- default:
- rc = ISCSI_ERR_BAD_OPCODE;
- break;
- }
- } else if (conn->in.itt == ISCSI_RESERVED_TAG) {
- switch(conn->in.opcode) {
- case ISCSI_OP_NOOP_IN:
- if (!conn->in.datalen) {
- rc = iscsi_check_assign_cmdsn(session,
- (struct iscsi_nopin*)hdr);
- if (!rc && hdr->ttt != ISCSI_RESERVED_TAG)
- rc = iscsi_recv_pdu(iscsi_handle(conn),
- hdr, NULL, 0);
- } else
- rc = ISCSI_ERR_PROTO;
- break;
- case ISCSI_OP_REJECT:
- /* we need sth like iscsi_reject_rsp()*/
- case ISCSI_OP_ASYNC_EVENT:
- /* we need sth like iscsi_async_event_rsp() */
- rc = ISCSI_ERR_BAD_OPCODE;
- break;
- default:
- rc = ISCSI_ERR_BAD_OPCODE;
- break;
- }
- } else
- rc = ISCSI_ERR_BAD_ITT;
-
- return rc;
-}
-
-/**
- * iscsi_ctask_copy - copy skb bits to the destanation cmd task
- * @conn: iscsi connection
- * @ctask: scsi command task
- * @buf: buffer to copy to
- * @buf_size: size of buffer
- * @offset: offset within the buffer
- *
- * Notes:
- * The function calls skb_copy_bits() and updates per-connection and
- * per-cmd byte counters.
- *
- * Read counters (in bytes):
- *
- * conn->in.offset offset within in progress SKB
- * conn->in.copy left to copy from in progress SKB
- * including padding
- * conn->in.copied copied already from in progress SKB
- * conn->data_copied copied already from in progress buffer
- * ctask->sent total bytes sent up to the MidLayer
- * ctask->data_count left to copy from in progress Data-In
- * buf_left left to copy from in progress buffer
- **/
-static inline int
-iscsi_ctask_copy(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- void *buf, int buf_size, int offset)
-{
- int buf_left = buf_size - (conn->data_copied + offset);
- int size = min(conn->in.copy, buf_left);
- int rc;
-
- size = min(size, ctask->data_count);
-
- debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
- size, conn->in.offset, conn->in.copied);
-
- BUG_ON(size <= 0);
- BUG_ON(ctask->sent + size > ctask->total_length);
-
- rc = skb_copy_bits(conn->in.skb, conn->in.offset,
- (char*)buf + (offset + conn->data_copied), size);
- /* must fit into skb->len */
- BUG_ON(rc);
-
- conn->in.offset += size;
- conn->in.copy -= size;
- conn->in.copied += size;
- conn->data_copied += size;
- ctask->sent += size;
- ctask->data_count -= size;
-
- BUG_ON(conn->in.copy < 0);
- BUG_ON(ctask->data_count < 0);
-
- if (buf_size != (conn->data_copied + offset)) {
- if (!ctask->data_count) {
- BUG_ON(buf_size - conn->data_copied < 0);
- /* done with this PDU */
- return buf_size - conn->data_copied;
- }
- return -EAGAIN;
- }
-
- /* done with this buffer or with both - PDU and buffer */
- conn->data_copied = 0;
- return 0;
-}
-
-/**
- * iscsi_tcp_copy - copy skb bits to the destanation buffer
- * @conn: iscsi connection
- * @buf: buffer to copy to
- * @buf_size: number of bytes to copy
- *
- * Notes:
- * The function calls skb_copy_bits() and updates per-connection
- * byte counters.
- **/
-static inline int
-iscsi_tcp_copy(struct iscsi_conn *conn, void *buf, int buf_size)
-{
- int buf_left = buf_size - conn->data_copied;
- int size = min(conn->in.copy, buf_left);
- int rc;
-
- debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
- size, conn->in.offset, conn->data_copied);
- BUG_ON(size <= 0);
-
- rc = skb_copy_bits(conn->in.skb, conn->in.offset,
- (char*)buf + conn->data_copied, size);
- BUG_ON(rc);
-
- conn->in.offset += size;
- conn->in.copy -= size;
- conn->in.copied += size;
- conn->data_copied += size;
-
- if (buf_size != conn->data_copied)
- return -EAGAIN;
-
- return 0;
-}
-
-static inline void
-partial_sg_digest_update(struct iscsi_conn *conn, struct scatterlist *sg,
- int offset, int length)
-{
- struct scatterlist temp;
-
- memcpy(&temp, sg, sizeof(struct scatterlist));
- temp.offset = offset;
- temp.length = length;
- crypto_digest_update(conn->data_rx_tfm, &temp, 1);
-}
-
-static void
-iscsi_recv_digest_update(struct iscsi_conn *conn, char* buf, int len)
-{
- struct scatterlist tmp;
-
- sg_init_one(&tmp, buf, len);
- crypto_digest_update(conn->data_rx_tfm, &tmp, 1);
-}
-
-static int iscsi_scsi_data_in(struct iscsi_conn *conn)
-{
- struct iscsi_cmd_task *ctask = conn->in.ctask;
- struct scsi_cmnd *sc = ctask->sc;
- struct scatterlist *sg;
- int i, offset, rc = 0;
-
- BUG_ON((void*)ctask != sc->SCp.ptr);
-
- /*
- * copying Data-In into the Scsi_Cmnd
- */
- if (!sc->use_sg) {
- i = ctask->data_count;
- rc = iscsi_ctask_copy(conn, ctask, sc->request_buffer,
- sc->request_bufflen, ctask->data_offset);
- if (rc == -EAGAIN)
- return rc;
- if (conn->datadgst_en)
- iscsi_recv_digest_update(conn, sc->request_buffer, i);
- rc = 0;
- goto done;
- }
-
- offset = ctask->data_offset;
- sg = sc->request_buffer;
-
- if (ctask->data_offset)
- for (i = 0; i < ctask->sg_count; i++)
- offset -= sg[i].length;
- /* we've passed through partial sg*/
- if (offset < 0)
- offset = 0;
-
- for (i = ctask->sg_count; i < sc->use_sg; i++) {
- char *dest;
-
- dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
- rc = iscsi_ctask_copy(conn, ctask, dest + sg[i].offset,
- sg[i].length, offset);
- kunmap_atomic(dest, KM_SOFTIRQ0);
- if (rc == -EAGAIN)
- /* continue with the next SKB/PDU */
- return rc;
- if (!rc) {
- if (conn->datadgst_en) {
- if (!offset)
- crypto_digest_update(conn->data_rx_tfm,
- &sg[i], 1);
- else
- partial_sg_digest_update(conn, &sg[i],
- sg[i].offset + offset,
- sg[i].length - offset);
- }
- offset = 0;
- ctask->sg_count++;
- }
-
- if (!ctask->data_count) {
- if (rc && conn->datadgst_en)
- /*
- * data-in is complete, but buffer not...
- */
- partial_sg_digest_update(conn, &sg[i],
- sg[i].offset, sg[i].length-rc);
- rc = 0;
- break;
- }
-
- if (!conn->in.copy)
- return -EAGAIN;
- }
- BUG_ON(ctask->data_count);
-
-done:
- /* check for non-exceptional status */
- if (conn->in.flags & ISCSI_FLAG_DATA_STATUS) {
- debug_scsi("done [sc %lx res %d itt 0x%x]\n",
- (long)sc, sc->result, ctask->itt);
- conn->scsirsp_pdus_cnt++;
- iscsi_ctask_cleanup(conn, ctask);
- sc->scsi_done(sc);
- }
-
- return rc;
-}
-
-static int
-iscsi_data_recv(struct iscsi_conn *conn)
-{
- struct iscsi_session *session = conn->session;
- int rc = 0;
-
- switch(conn->in.opcode) {
- case ISCSI_OP_SCSI_DATA_IN:
- rc = iscsi_scsi_data_in(conn);
- break;
- case ISCSI_OP_SCSI_CMD_RSP: {
- /*
- * SCSI Sense Data:
- * copying the entire Data Segment.
- */
- if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
- rc = -EAGAIN;
- goto exit;
- }
-
- /*
- * check for sense
- */
- conn->in.hdr = &conn->hdr;
- conn->senselen = (conn->data[0] << 8) | conn->data[1];
- rc = iscsi_cmd_rsp(conn, conn->in.ctask);
- if (!rc && conn->datadgst_en)
- iscsi_recv_digest_update(conn, conn->data,
- conn->in.datalen);
- }
- break;
- case ISCSI_OP_TEXT_RSP:
- case ISCSI_OP_LOGIN_RSP:
- case ISCSI_OP_NOOP_IN: {
- struct iscsi_mgmt_task *mtask = NULL;
-
- if (conn->in.itt != ISCSI_RESERVED_TAG)
- mtask = (struct iscsi_mgmt_task *)
- session->mgmt_cmds[conn->in.itt -
- ISCSI_MGMT_ITT_OFFSET];
-
- /*
- * Collect data segment to the connection's data
- * placeholder
- */
- if (iscsi_tcp_copy(conn, conn->data, conn->in.datalen)) {
- rc = -EAGAIN;
- goto exit;
- }
-
- rc = iscsi_recv_pdu(iscsi_handle(conn), conn->in.hdr,
- conn->data, conn->in.datalen);
-
- if (!rc && conn->datadgst_en &&
- conn->in.opcode != ISCSI_OP_LOGIN_RSP)
- iscsi_recv_digest_update(conn, conn->data,
- conn->in.datalen);
-
- if (mtask && conn->login_mtask != mtask) {
- spin_lock(&session->lock);
- __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
- sizeof(void*));
- spin_unlock(&session->lock);
- }
- }
- break;
- case ISCSI_OP_ASYNC_EVENT:
- case ISCSI_OP_REJECT:
- default:
- BUG_ON(1);
- }
-exit:
- return rc;
-}
-
-/**
- * iscsi_tcp_data_recv - TCP receive in sendfile fashion
- * @rd_desc: read descriptor
- * @skb: socket buffer
- * @offset: offset in skb
- * @len: skb->len - offset
- **/
-static int
-iscsi_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
- unsigned int offset, size_t len)
-{
- int rc;
- struct iscsi_conn *conn = rd_desc->arg.data;
- int processed;
- char pad[ISCSI_PAD_LEN];
- struct scatterlist sg;
-
- /*
- * Save current SKB and its offset in the corresponding
- * connection context.
- */
- conn->in.copy = skb->len - offset;
- conn->in.offset = offset;
- conn->in.skb = skb;
- conn->in.len = conn->in.copy;
- BUG_ON(conn->in.copy <= 0);
- debug_tcp("in %d bytes\n", conn->in.copy);
-
-more:
- conn->in.copied = 0;
- rc = 0;
-
- if (unlikely(conn->suspend_rx)) {
- debug_tcp("conn %d Rx suspended!\n", conn->id);
- return 0;
- }
-
- if (conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
- conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
- rc = iscsi_hdr_extract(conn);
- if (rc) {
- if (rc == -EAGAIN)
- goto nomore;
- else {
- iscsi_conn_failure(conn, rc);
- return 0;
- }
- }
-
- /*
- * Verify and process incoming PDU header.
- */
- rc = iscsi_hdr_recv(conn);
- if (!rc && conn->in.datalen) {
- if (conn->datadgst_en) {
- BUG_ON(!conn->data_rx_tfm);
- crypto_digest_init(conn->data_rx_tfm);
- }
- conn->in_progress = IN_PROGRESS_DATA_RECV;
- } else if (rc) {
- iscsi_conn_failure(conn, rc);
- return 0;
- }
- }
-
- if (conn->in_progress == IN_PROGRESS_DDIGEST_RECV) {
- uint32_t recv_digest;
- debug_tcp("extra data_recv offset %d copy %d\n",
- conn->in.offset, conn->in.copy);
- skb_copy_bits(conn->in.skb, conn->in.offset,
- &recv_digest, 4);
- conn->in.offset += 4;
- conn->in.copy -= 4;
- if (recv_digest != conn->in.datadgst) {
- debug_tcp("iscsi_tcp: data digest error!"
- "0x%x != 0x%x\n", recv_digest,
- conn->in.datadgst);
- iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
- return 0;
- } else {
- debug_tcp("iscsi_tcp: data digest match!"
- "0x%x == 0x%x\n", recv_digest,
- conn->in.datadgst);
- conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- }
- }
-
- if (conn->in_progress == IN_PROGRESS_DATA_RECV && conn->in.copy) {
-
- debug_tcp("data_recv offset %d copy %d\n",
- conn->in.offset, conn->in.copy);
-
- rc = iscsi_data_recv(conn);
- if (rc) {
- if (rc == -EAGAIN) {
- rd_desc->count = conn->in.datalen -
- conn->in.ctask->data_count;
- goto again;
- }
- iscsi_conn_failure(conn, rc);
- return 0;
- }
- conn->in.copy -= conn->in.padding;
- conn->in.offset += conn->in.padding;
- if (conn->datadgst_en) {
- if (conn->in.padding) {
- debug_tcp("padding -> %d\n", conn->in.padding);
- memset(pad, 0, conn->in.padding);
- sg_init_one(&sg, pad, conn->in.padding);
- crypto_digest_update(conn->data_rx_tfm, &sg, 1);
- }
- crypto_digest_final(conn->data_rx_tfm,
- (u8 *) & conn->in.datadgst);
- debug_tcp("rx digest 0x%x\n", conn->in.datadgst);
- conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
- } else
- conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- }
-
- debug_tcp("f, processed %d from out of %d padding %d\n",
- conn->in.offset - offset, (int)len, conn->in.padding);
- BUG_ON(conn->in.offset - offset > len);
-
- if (conn->in.offset - offset != len) {
- debug_tcp("continue to process %d bytes\n",
- (int)len - (conn->in.offset - offset));
- goto more;
- }
-
-nomore:
- processed = conn->in.offset - offset;
- BUG_ON(processed == 0);
- return processed;
-
-again:
- processed = conn->in.offset - offset;
- debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
- processed, (int)len, (int)rd_desc->count);
- BUG_ON(processed == 0);
- BUG_ON(processed > len);
-
- conn->rxdata_octets += processed;
- return processed;
-}
-
-static void
-iscsi_tcp_data_ready(struct sock *sk, int flag)
-{
- struct iscsi_conn *conn = sk->sk_user_data;
- read_descriptor_t rd_desc;
-
- read_lock(&sk->sk_callback_lock);
-
- /* use rd_desc to pass 'conn' to iscsi_tcp_data_recv */
- rd_desc.arg.data = conn;
- rd_desc.count = 0;
- tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
-
- read_unlock(&sk->sk_callback_lock);
-}
-
-static void
-iscsi_tcp_state_change(struct sock *sk)
-{
- struct iscsi_conn *conn;
- struct iscsi_session *session;
- void (*old_state_change)(struct sock *);
-
- read_lock(&sk->sk_callback_lock);
-
- conn = (struct iscsi_conn*)sk->sk_user_data;
- session = conn->session;
-
- if ((sk->sk_state == TCP_CLOSE_WAIT ||
- sk->sk_state == TCP_CLOSE) &&
- !atomic_read(&sk->sk_rmem_alloc)) {
- debug_tcp("iscsi_tcp_state_change: TCP_CLOSE|TCP_CLOSE_WAIT\n");
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- }
-
- old_state_change = conn->old_state_change;
-
- read_unlock(&sk->sk_callback_lock);
-
- old_state_change(sk);
-}
-
-/**
- * iscsi_write_space - Called when more output buffer space is available
- * @sk: socket space is available for
- **/
-static void
-iscsi_write_space(struct sock *sk)
-{
- struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
- conn->old_write_space(sk);
- debug_tcp("iscsi_write_space: cid %d\n", conn->id);
- clear_bit(SUSPEND_BIT, &conn->suspend_tx);
- scsi_queue_work(conn->session->host, &conn->xmitwork);
-}
-
-static void
-iscsi_conn_set_callbacks(struct iscsi_conn *conn)
-{
- struct sock *sk = conn->sock->sk;
-
- /* assign new callbacks */
- write_lock_bh(&sk->sk_callback_lock);
- sk->sk_user_data = conn;
- conn->old_data_ready = sk->sk_data_ready;
- conn->old_state_change = sk->sk_state_change;
- conn->old_write_space = sk->sk_write_space;
- sk->sk_data_ready = iscsi_tcp_data_ready;
- sk->sk_state_change = iscsi_tcp_state_change;
- sk->sk_write_space = iscsi_write_space;
- write_unlock_bh(&sk->sk_callback_lock);
-}
-
-static void
-iscsi_conn_restore_callbacks(struct iscsi_conn *conn)
-{
- struct sock *sk = conn->sock->sk;
-
- /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
- write_lock_bh(&sk->sk_callback_lock);
- sk->sk_user_data = NULL;
- sk->sk_data_ready = conn->old_data_ready;
- sk->sk_state_change = conn->old_state_change;
- sk->sk_write_space = conn->old_write_space;
- sk->sk_no_check = 0;
- write_unlock_bh(&sk->sk_callback_lock);
-}
-
-/**
- * iscsi_send - generic send routine
- * @sk: kernel's socket
- * @buf: buffer to write from
- * @size: actual size to write
- * @flags: socket's flags
- */
-static inline int
-iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags)
-{
- struct socket *sk = conn->sock;
- int offset = buf->sg.offset + buf->sent;
-
- /*
- * if we got use_sg=0 or are sending something we kmallocd
- * then we did not have to do kmap (kmap returns page_address)
- *
- * if we got use_sg > 0, but had to drop down, we do not
- * set clustering so this should only happen for that
- * slab case.
- */
- if (buf->use_sendmsg)
- return sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
- else
- return conn->sendpage(sk, buf->sg.page, offset, size, flags);
-}
-
-/**
- * iscsi_sendhdr - send PDU Header via tcp_sendpage()
- * @conn: iscsi connection
- * @buf: buffer to write from
- * @datalen: lenght of data to be sent after the header
- *
- * Notes:
- * (Tx, Fast Path)
- **/
-static inline int
-iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
-{
- int flags = 0; /* MSG_DONTWAIT; */
- int res, size;
-
- size = buf->sg.length - buf->sent;
- BUG_ON(buf->sent + size > buf->sg.length);
- if (buf->sent + size != buf->sg.length || datalen)
- flags |= MSG_MORE;
-
- res = iscsi_send(conn, buf, size, flags);
- debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res);
- if (res >= 0) {
- conn->txdata_octets += res;
- buf->sent += res;
- if (size != res)
- return -EAGAIN;
- return 0;
- } else if (res == -EAGAIN) {
- conn->sendpage_failures_cnt++;
- set_bit(SUSPEND_BIT, &conn->suspend_tx);
- } else if (res == -EPIPE)
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-
- return res;
-}
-
-/**
- * iscsi_sendpage - send one page of iSCSI Data-Out.
- * @conn: iscsi connection
- * @buf: buffer to write from
- * @count: remaining data
- * @sent: number of bytes sent
- *
- * Notes:
- * (Tx, Fast Path)
- **/
-static inline int
-iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf,
- int *count, int *sent)
-{
- int flags = 0; /* MSG_DONTWAIT; */
- int res, size;
-
- size = buf->sg.length - buf->sent;
- BUG_ON(buf->sent + size > buf->sg.length);
- if (size > *count)
- size = *count;
- if (buf->sent + size != buf->sg.length || *count != size)
- flags |= MSG_MORE;
-
- res = iscsi_send(conn, buf, size, flags);
- debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n",
- size, buf->sent, *count, *sent, res);
- if (res >= 0) {
- conn->txdata_octets += res;
- buf->sent += res;
- *count -= res;
- *sent += res;
- if (size != res)
- return -EAGAIN;
- return 0;
- } else if (res == -EAGAIN) {
- conn->sendpage_failures_cnt++;
- set_bit(SUSPEND_BIT, &conn->suspend_tx);
- } else if (res == -EPIPE)
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-
- return res;
-}
-
-static inline void
-iscsi_data_digest_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- BUG_ON(!conn->data_tx_tfm);
- crypto_digest_init(conn->data_tx_tfm);
- ctask->digest_count = 4;
-}
-
-static int
-iscsi_digest_final_send(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct iscsi_buf *buf, uint32_t *digest, int final)
-{
- int rc = 0;
- int sent = 0;
-
- if (final)
- crypto_digest_final(conn->data_tx_tfm, (u8*)digest);
-
- iscsi_buf_init_virt(buf, (char*)digest, 4);
- rc = iscsi_sendpage(conn, buf, &ctask->digest_count, &sent);
- if (rc) {
- ctask->datadigest = *digest;
- ctask->xmstate |= XMSTATE_DATA_DIGEST;
- } else
- ctask->digest_count = 4;
- return rc;
-}
-
-/**
- * iscsi_solicit_data_cont - initialize next Data-Out
- * @conn: iscsi connection
- * @ctask: scsi command task
- * @r2t: R2T info
- * @left: bytes left to transfer
- *
- * Notes:
- * Initialize next Data-Out within this R2T sequence and continue
- * to process next Scatter-Gather element(if any) of this SCSI command.
- *
- * Called under connection lock.
- **/
-static void
-iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct iscsi_r2t_info *r2t, int left)
-{
- struct iscsi_data *hdr;
- struct iscsi_data_task *dtask;
- struct scsi_cmnd *sc = ctask->sc;
- int new_offset;
-
- dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
- BUG_ON(!dtask);
- hdr = &dtask->hdr;
- memset(hdr, 0, sizeof(struct iscsi_data));
- hdr->ttt = r2t->ttt;
- hdr->datasn = cpu_to_be32(r2t->solicit_datasn);
- r2t->solicit_datasn++;
- hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
- memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
- hdr->itt = ctask->hdr.itt;
- hdr->exp_statsn = r2t->exp_statsn;
- new_offset = r2t->data_offset + r2t->sent;
- hdr->offset = cpu_to_be32(new_offset);
- if (left > conn->max_xmit_dlength) {
- hton24(hdr->dlength, conn->max_xmit_dlength);
- r2t->data_count = conn->max_xmit_dlength;
- } else {
- hton24(hdr->dlength, left);
- r2t->data_count = left;
- hdr->flags = ISCSI_FLAG_CMD_FINAL;
- }
- conn->dataout_pdus_cnt++;
-
- iscsi_buf_init_virt(&r2t->headbuf, (char*)hdr,
- sizeof(struct iscsi_hdr));
-
- r2t->dtask = dtask;
-
- if (sc->use_sg && !iscsi_buf_left(&r2t->sendbuf)) {
- BUG_ON(ctask->bad_sg == r2t->sg);
- iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
- r2t->sg += 1;
- } else
- iscsi_buf_init_iov(&ctask->sendbuf,
- (char*)sc->request_buffer + new_offset,
- r2t->data_count);
-
- list_add(&dtask->item, &ctask->dataqueue);
-}
-
-static void
-iscsi_unsolicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_data *hdr;
- struct iscsi_data_task *dtask;
-
- dtask = mempool_alloc(ctask->datapool, GFP_ATOMIC);
- BUG_ON(!dtask);
- hdr = &dtask->hdr;
- memset(hdr, 0, sizeof(struct iscsi_data));
- hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
- hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
- ctask->unsol_datasn++;
- hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
- memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
- hdr->itt = ctask->hdr.itt;
- hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
- hdr->offset = cpu_to_be32(ctask->total_length -
- ctask->r2t_data_count -
- ctask->unsol_count);
- if (ctask->unsol_count > conn->max_xmit_dlength) {
- hton24(hdr->dlength, conn->max_xmit_dlength);
- ctask->data_count = conn->max_xmit_dlength;
- hdr->flags = 0;
- } else {
- hton24(hdr->dlength, ctask->unsol_count);
- ctask->data_count = ctask->unsol_count;
- hdr->flags = ISCSI_FLAG_CMD_FINAL;
- }
-
- iscsi_buf_init_virt(&ctask->headbuf, (char*)hdr,
- sizeof(struct iscsi_hdr));
-
- list_add(&dtask->item, &ctask->dataqueue);
-
- ctask->dtask = dtask;
-}
-
-/**
- * iscsi_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
- * @conn: iscsi connection
- * @ctask: scsi command task
- * @sc: scsi command
- **/
-static void
-iscsi_cmd_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct scsi_cmnd *sc)
-{
- struct iscsi_session *session = conn->session;
-
- BUG_ON(__kfifo_len(ctask->r2tqueue));
-
- ctask->sc = sc;
- ctask->conn = conn;
- ctask->hdr.opcode = ISCSI_OP_SCSI_CMD;
- ctask->hdr.flags = ISCSI_ATTR_SIMPLE;
- int_to_scsilun(sc->device->lun, (struct scsi_lun *)ctask->hdr.lun);
- ctask->hdr.itt = ctask->itt | (conn->id << CID_SHIFT) |
- (session->age << AGE_SHIFT);
- ctask->hdr.data_length = cpu_to_be32(sc->request_bufflen);
- ctask->hdr.cmdsn = cpu_to_be32(session->cmdsn); session->cmdsn++;
- ctask->hdr.exp_statsn = cpu_to_be32(conn->exp_statsn);
- memcpy(ctask->hdr.cdb, sc->cmnd, sc->cmd_len);
- memset(&ctask->hdr.cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
-
- ctask->mtask = NULL;
- ctask->sent = 0;
- ctask->sg_count = 0;
-
- ctask->total_length = sc->request_bufflen;
-
- if (sc->sc_data_direction == DMA_TO_DEVICE) {
- ctask->exp_r2tsn = 0;
- ctask->hdr.flags |= ISCSI_FLAG_CMD_WRITE;
- BUG_ON(ctask->total_length == 0);
- if (sc->use_sg) {
- struct scatterlist *sg = sc->request_buffer;
-
- iscsi_buf_init_sg(&ctask->sendbuf,
- &sg[ctask->sg_count++]);
- ctask->sg = sg;
- ctask->bad_sg = sg + sc->use_sg;
- } else {
- iscsi_buf_init_iov(&ctask->sendbuf, sc->request_buffer,
- sc->request_bufflen);
- }
-
- /*
- * Write counters:
- *
- * imm_count bytes to be sent right after
- * SCSI PDU Header
- *
- * unsol_count bytes(as Data-Out) to be sent
- * without R2T ack right after
- * immediate data
- *
- * r2t_data_count bytes to be sent via R2T ack's
- *
- * pad_count bytes to be sent as zero-padding
- */
- ctask->imm_count = 0;
- ctask->unsol_count = 0;
- ctask->unsol_datasn = 0;
- ctask->xmstate = XMSTATE_W_HDR;
- /* calculate write padding */
- ctask->pad_count = ctask->total_length & (ISCSI_PAD_LEN-1);
- if (ctask->pad_count) {
- ctask->pad_count = ISCSI_PAD_LEN - ctask->pad_count;
- debug_scsi("write padding %d bytes\n",
- ctask->pad_count);
- ctask->xmstate |= XMSTATE_W_PAD;
- }
- if (session->imm_data_en) {
- if (ctask->total_length >= session->first_burst)
- ctask->imm_count = min(session->first_burst,
- conn->max_xmit_dlength);
- else
- ctask->imm_count = min(ctask->total_length,
- conn->max_xmit_dlength);
- hton24(ctask->hdr.dlength, ctask->imm_count);
- ctask->xmstate |= XMSTATE_IMM_DATA;
- } else
- zero_data(ctask->hdr.dlength);
-
- if (!session->initial_r2t_en)
- ctask->unsol_count = min(session->first_burst,
- ctask->total_length) - ctask->imm_count;
- if (!ctask->unsol_count)
- /* No unsolicit Data-Out's */
- ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
- else
- ctask->xmstate |= XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
-
- ctask->r2t_data_count = ctask->total_length -
- ctask->imm_count -
- ctask->unsol_count;
-
- debug_scsi("cmd [itt %x total %d imm %d imm_data %d "
- "r2t_data %d]\n",
- ctask->itt, ctask->total_length, ctask->imm_count,
- ctask->unsol_count, ctask->r2t_data_count);
- } else {
- ctask->hdr.flags |= ISCSI_FLAG_CMD_FINAL;
- if (sc->sc_data_direction == DMA_FROM_DEVICE)
- ctask->hdr.flags |= ISCSI_FLAG_CMD_READ;
- ctask->datasn = 0;
- ctask->xmstate = XMSTATE_R_HDR;
- zero_data(ctask->hdr.dlength);
- }
-
- iscsi_buf_init_virt(&ctask->headbuf, (char*)&ctask->hdr,
- sizeof(struct iscsi_hdr));
- conn->scsicmd_pdus_cnt++;
-}
-
-/**
- * iscsi_mtask_xmit - xmit management(immediate) task
- * @conn: iscsi connection
- * @mtask: task management task
- *
- * Notes:
- * The function can return -EAGAIN in which case caller must
- * call it again later, or recover. '0' return code means successful
- * xmit.
- *
- * Management xmit state machine consists of two states:
- * IN_PROGRESS_IMM_HEAD - PDU Header xmit in progress
- * IN_PROGRESS_IMM_DATA - PDU Data xmit in progress
- **/
-static int
-iscsi_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
-{
-
- debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
- conn->id, mtask->xmstate, mtask->itt);
-
- if (mtask->xmstate & XMSTATE_IMM_HDR) {
- mtask->xmstate &= ~XMSTATE_IMM_HDR;
- if (mtask->data_count)
- mtask->xmstate |= XMSTATE_IMM_DATA;
- if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
- conn->stop_stage != STOP_CONN_RECOVER &&
- conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &mtask->headbuf,
- (u8*)mtask->hdrext);
- if (iscsi_sendhdr(conn, &mtask->headbuf, mtask->data_count)) {
- mtask->xmstate |= XMSTATE_IMM_HDR;
- if (mtask->data_count)
- mtask->xmstate &= ~XMSTATE_IMM_DATA;
- return -EAGAIN;
- }
- }
-
- if (mtask->xmstate & XMSTATE_IMM_DATA) {
- BUG_ON(!mtask->data_count);
- mtask->xmstate &= ~XMSTATE_IMM_DATA;
- /* FIXME: implement.
- * Virtual buffer could be spreaded across multiple pages...
- */
- do {
- if (iscsi_sendpage(conn, &mtask->sendbuf,
- &mtask->data_count, &mtask->sent)) {
- mtask->xmstate |= XMSTATE_IMM_DATA;
- return -EAGAIN;
- }
- } while (mtask->data_count);
- }
-
- BUG_ON(mtask->xmstate != XMSTATE_IDLE);
- return 0;
-}
-
-static inline int
-handle_xmstate_r_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- ctask->xmstate &= ~XMSTATE_R_HDR;
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
- if (!iscsi_sendhdr(conn, &ctask->headbuf, 0)) {
- BUG_ON(ctask->xmstate != XMSTATE_IDLE);
- return 0; /* wait for Data-In */
- }
- ctask->xmstate |= XMSTATE_R_HDR;
- return -EAGAIN;
-}
-
-static inline int
-handle_xmstate_w_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- ctask->xmstate &= ~XMSTATE_W_HDR;
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &ctask->headbuf, (u8*)ctask->hdrext);
- if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->imm_count)) {
- ctask->xmstate |= XMSTATE_W_HDR;
- return -EAGAIN;
- }
- return 0;
-}
-
-static inline int
-handle_xmstate_data_digest(struct iscsi_conn *conn,
- struct iscsi_cmd_task *ctask)
-{
- ctask->xmstate &= ~XMSTATE_DATA_DIGEST;
- debug_tcp("resent data digest 0x%x\n", ctask->datadigest);
- if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
- &ctask->datadigest, 0)) {
- ctask->xmstate |= XMSTATE_DATA_DIGEST;
- debug_tcp("resent data digest 0x%x fail!\n",
- ctask->datadigest);
- return -EAGAIN;
- }
- return 0;
-}
-
-static inline int
-handle_xmstate_imm_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- BUG_ON(!ctask->imm_count);
- ctask->xmstate &= ~XMSTATE_IMM_DATA;
-
- if (conn->datadgst_en) {
- iscsi_data_digest_init(conn, ctask);
- ctask->immdigest = 0;
- }
-
- for (;;) {
- if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->imm_count,
- &ctask->sent)) {
- ctask->xmstate |= XMSTATE_IMM_DATA;
- if (conn->datadgst_en) {
- crypto_digest_final(conn->data_tx_tfm,
- (u8*)&ctask->immdigest);
- debug_tcp("tx imm sendpage fail 0x%x\n",
- ctask->datadigest);
- }
- return -EAGAIN;
- }
- if (conn->datadgst_en)
- crypto_digest_update(conn->data_tx_tfm,
- &ctask->sendbuf.sg, 1);
-
- if (!ctask->imm_count)
- break;
- iscsi_buf_init_sg(&ctask->sendbuf,
- &ctask->sg[ctask->sg_count++]);
- }
-
- if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
- if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
- &ctask->immdigest, 1)) {
- debug_tcp("sending imm digest 0x%x fail!\n",
- ctask->immdigest);
- return -EAGAIN;
- }
- debug_tcp("sending imm digest 0x%x\n", ctask->immdigest);
- }
-
- return 0;
-}
-
-static inline int
-handle_xmstate_uns_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_data_task *dtask;
-
- ctask->xmstate |= XMSTATE_UNS_DATA;
- if (ctask->xmstate & XMSTATE_UNS_INIT) {
- iscsi_unsolicit_data_init(conn, ctask);
- BUG_ON(!ctask->dtask);
- dtask = ctask->dtask;
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &ctask->headbuf,
- (u8*)dtask->hdrext);
- ctask->xmstate &= ~XMSTATE_UNS_INIT;
- }
- if (iscsi_sendhdr(conn, &ctask->headbuf, ctask->data_count)) {
- ctask->xmstate &= ~XMSTATE_UNS_DATA;
- ctask->xmstate |= XMSTATE_UNS_HDR;
- return -EAGAIN;
- }
-
- debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
- ctask->itt, ctask->unsol_count, ctask->sent);
- return 0;
-}
-
-static inline int
-handle_xmstate_uns_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_data_task *dtask = ctask->dtask;
-
- BUG_ON(!ctask->data_count);
- ctask->xmstate &= ~XMSTATE_UNS_DATA;
-
- if (conn->datadgst_en) {
- iscsi_data_digest_init(conn, ctask);
- dtask->digest = 0;
- }
-
- for (;;) {
- int start = ctask->sent;
-
- if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->data_count,
- &ctask->sent)) {
- ctask->unsol_count -= ctask->sent - start;
- ctask->xmstate |= XMSTATE_UNS_DATA;
- /* will continue with this ctask later.. */
- if (conn->datadgst_en) {
- crypto_digest_final(conn->data_tx_tfm,
- (u8 *)&dtask->digest);
- debug_tcp("tx uns data fail 0x%x\n",
- dtask->digest);
- }
- return -EAGAIN;
- }
-
- BUG_ON(ctask->sent > ctask->total_length);
- ctask->unsol_count -= ctask->sent - start;
-
- /*
- * XXX:we may run here with un-initial sendbuf.
- * so pass it
- */
- if (conn->datadgst_en && ctask->sent - start > 0)
- crypto_digest_update(conn->data_tx_tfm,
- &ctask->sendbuf.sg, 1);
-
- if (!ctask->data_count)
- break;
- iscsi_buf_init_sg(&ctask->sendbuf,
- &ctask->sg[ctask->sg_count++]);
- }
- BUG_ON(ctask->unsol_count < 0);
-
- /*
- * Done with the Data-Out. Next, check if we need
- * to send another unsolicited Data-Out.
- */
- if (ctask->unsol_count) {
- if (conn->datadgst_en) {
- if (iscsi_digest_final_send(conn, ctask,
- &dtask->digestbuf,
- &dtask->digest, 1)) {
- debug_tcp("send uns digest 0x%x fail\n",
- dtask->digest);
- return -EAGAIN;
- }
- debug_tcp("sending uns digest 0x%x, more uns\n",
- dtask->digest);
- }
- ctask->xmstate |= XMSTATE_UNS_INIT;
- return 1;
- }
-
- if (conn->datadgst_en && !(ctask->xmstate & XMSTATE_W_PAD)) {
- if (iscsi_digest_final_send(conn, ctask,
- &dtask->digestbuf,
- &dtask->digest, 1)) {
- debug_tcp("send last uns digest 0x%x fail\n",
- dtask->digest);
- return -EAGAIN;
- }
- debug_tcp("sending uns digest 0x%x\n",dtask->digest);
- }
-
- return 0;
-}
-
-static inline int
-handle_xmstate_sol_data(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_session *session = conn->session;
- struct iscsi_r2t_info *r2t = ctask->r2t;
- struct iscsi_data_task *dtask = r2t->dtask;
- int left;
-
- ctask->xmstate &= ~XMSTATE_SOL_DATA;
- ctask->dtask = dtask;
-
- if (conn->datadgst_en) {
- iscsi_data_digest_init(conn, ctask);
- dtask->digest = 0;
- }
-solicit_again:
- /*
- * send Data-Out whitnin this R2T sequence.
- */
- if (!r2t->data_count)
- goto data_out_done;
-
- if (iscsi_sendpage(conn, &r2t->sendbuf, &r2t->data_count, &r2t->sent)) {
- ctask->xmstate |= XMSTATE_SOL_DATA;
- /* will continue with this ctask later.. */
- if (conn->datadgst_en) {
- crypto_digest_final(conn->data_tx_tfm,
- (u8 *)&dtask->digest);
- debug_tcp("r2t data send fail 0x%x\n", dtask->digest);
- }
- return -EAGAIN;
- }
-
- BUG_ON(r2t->data_count < 0);
- if (conn->datadgst_en)
- crypto_digest_update(conn->data_tx_tfm, &r2t->sendbuf.sg, 1);
-
- if (r2t->data_count) {
- BUG_ON(ctask->sc->use_sg == 0);
- if (!iscsi_buf_left(&r2t->sendbuf)) {
- BUG_ON(ctask->bad_sg == r2t->sg);
- iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
- r2t->sg += 1;
- }
- goto solicit_again;
- }
-
-data_out_done:
- /*
- * Done with this Data-Out. Next, check if we have
- * to send another Data-Out for this R2T.
- */
- BUG_ON(r2t->data_length - r2t->sent < 0);
- left = r2t->data_length - r2t->sent;
- if (left) {
- if (conn->datadgst_en) {
- if (iscsi_digest_final_send(conn, ctask,
- &dtask->digestbuf,
- &dtask->digest, 1)) {
- debug_tcp("send r2t data digest 0x%x"
- "fail\n", dtask->digest);
- return -EAGAIN;
- }
- debug_tcp("r2t data send digest 0x%x\n",
- dtask->digest);
- }
- iscsi_solicit_data_cont(conn, ctask, r2t, left);
- ctask->xmstate |= XMSTATE_SOL_DATA;
- ctask->xmstate &= ~XMSTATE_SOL_HDR;
- return 1;
- }
-
- /*
- * Done with this R2T. Check if there are more
- * outstanding R2Ts ready to be processed.
- */
- BUG_ON(ctask->r2t_data_count - r2t->data_length < 0);
- if (conn->datadgst_en) {
- if (iscsi_digest_final_send(conn, ctask, &dtask->digestbuf,
- &dtask->digest, 1)) {
- debug_tcp("send last r2t data digest 0x%x"
- "fail\n", dtask->digest);
- return -EAGAIN;
- }
- debug_tcp("r2t done dout digest 0x%x\n", dtask->digest);
- }
-
- ctask->r2t_data_count -= r2t->data_length;
- ctask->r2t = NULL;
- spin_lock_bh(&session->lock);
- __kfifo_put(ctask->r2tpool.queue, (void*)&r2t, sizeof(void*));
- spin_unlock_bh(&session->lock);
- if (__kfifo_get(ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
- ctask->r2t = r2t;
- ctask->xmstate |= XMSTATE_SOL_DATA;
- ctask->xmstate &= ~XMSTATE_SOL_HDR;
- return 1;
- }
-
- return 0;
-}
-
-static inline int
-handle_xmstate_w_pad(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_data_task *dtask = ctask->dtask;
- int sent;
-
- ctask->xmstate &= ~XMSTATE_W_PAD;
- iscsi_buf_init_virt(&ctask->sendbuf, (char*)&ctask->pad,
- ctask->pad_count);
- if (iscsi_sendpage(conn, &ctask->sendbuf, &ctask->pad_count, &sent)) {
- ctask->xmstate |= XMSTATE_W_PAD;
- return -EAGAIN;
- }
-
- if (conn->datadgst_en) {
- crypto_digest_update(conn->data_tx_tfm, &ctask->sendbuf.sg, 1);
- /* imm data? */
- if (!dtask) {
- if (iscsi_digest_final_send(conn, ctask, &ctask->immbuf,
- &ctask->immdigest, 1)) {
- debug_tcp("send padding digest 0x%x"
- "fail!\n", ctask->immdigest);
- return -EAGAIN;
- }
- debug_tcp("done with padding, digest 0x%x\n",
- ctask->datadigest);
- } else {
- if (iscsi_digest_final_send(conn, ctask,
- &dtask->digestbuf,
- &dtask->digest, 1)) {
- debug_tcp("send padding digest 0x%x"
- "fail\n", dtask->digest);
- return -EAGAIN;
- }
- debug_tcp("done with padding, digest 0x%x\n",
- dtask->digest);
- }
- }
-
- return 0;
-}
-
-static int
-iscsi_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- int rc = 0;
-
- debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
- conn->id, ctask->xmstate, ctask->itt);
-
- /*
- * serialize with TMF AbortTask
- */
- if (ctask->mtask)
- return rc;
-
- if (ctask->xmstate & XMSTATE_R_HDR) {
- rc = handle_xmstate_r_hdr(conn, ctask);
- return rc;
- }
-
- if (ctask->xmstate & XMSTATE_W_HDR) {
- rc = handle_xmstate_w_hdr(conn, ctask);
- if (rc)
- return rc;
- }
-
- /* XXX: for data digest xmit recover */
- if (ctask->xmstate & XMSTATE_DATA_DIGEST) {
- rc = handle_xmstate_data_digest(conn, ctask);
- if (rc)
- return rc;
- }
+static struct scsi_transport_template *iscsi_sw_tcp_scsi_transport;
+static struct scsi_host_template iscsi_sw_tcp_sht;
+static struct iscsi_transport iscsi_sw_tcp_transport;
- if (ctask->xmstate & XMSTATE_IMM_DATA) {
- rc = handle_xmstate_imm_data(conn, ctask);
- if (rc)
- return rc;
- }
+static unsigned int iscsi_max_lun = 512;
+module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
- if (ctask->xmstate & XMSTATE_UNS_HDR) {
- BUG_ON(!ctask->unsol_count);
- ctask->xmstate &= ~XMSTATE_UNS_HDR;
-unsolicit_head_again:
- rc = handle_xmstate_uns_hdr(conn, ctask);
- if (rc)
- return rc;
- }
+static int iscsi_sw_tcp_dbg;
+module_param_named(debug_iscsi_tcp, iscsi_sw_tcp_dbg, int,
+ S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug_iscsi_tcp, "Turn on debugging for iscsi_tcp module "
+ "Set to 1 to turn on, and zero to turn off. Default is off.");
- if (ctask->xmstate & XMSTATE_UNS_DATA) {
- rc = handle_xmstate_uns_data(conn, ctask);
- if (rc == 1)
- goto unsolicit_head_again;
- else if (rc)
- return rc;
- goto done;
- }
+#define ISCSI_SW_TCP_DBG(_conn, dbg_fmt, arg...) \
+ do { \
+ if (iscsi_sw_tcp_dbg) \
+ iscsi_conn_printk(KERN_INFO, _conn, \
+ "%s " dbg_fmt, \
+ __func__, ##arg); \
+ } while (0);
- if (ctask->xmstate & XMSTATE_SOL_HDR) {
- struct iscsi_r2t_info *r2t;
-
- ctask->xmstate &= ~XMSTATE_SOL_HDR;
- ctask->xmstate |= XMSTATE_SOL_DATA;
- if (!ctask->r2t)
- __kfifo_get(ctask->r2tqueue, (void*)&ctask->r2t,
- sizeof(void*));
-solicit_head_again:
- r2t = ctask->r2t;
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &r2t->headbuf,
- (u8*)r2t->dtask->hdrext);
- if (iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count)) {
- ctask->xmstate &= ~XMSTATE_SOL_DATA;
- ctask->xmstate |= XMSTATE_SOL_HDR;
- return -EAGAIN;
- }
- debug_scsi("sol dout [dsn %d itt 0x%x dlen %d sent %d]\n",
- r2t->solicit_datasn - 1, ctask->itt, r2t->data_count,
- r2t->sent);
- }
+/**
+ * iscsi_sw_tcp_recv - TCP receive in sendfile fashion
+ * @rd_desc: read descriptor
+ * @skb: socket buffer
+ * @offset: offset in skb
+ * @len: skb->len - offset
+ */
+static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
+ unsigned int offset, size_t len)
+{
+ struct iscsi_conn *conn = rd_desc->arg.data;
+ unsigned int consumed, total_consumed = 0;
+ int status;
- if (ctask->xmstate & XMSTATE_SOL_DATA) {
- rc = handle_xmstate_sol_data(conn, ctask);
- if (rc == 1)
- goto solicit_head_again;
- if (rc)
- return rc;
- }
+ ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
-done:
- /*
- * Last thing to check is whether we need to send write
- * padding. Note that we check for xmstate equality, not just the bit.
- */
- if (ctask->xmstate == XMSTATE_W_PAD)
- rc = handle_xmstate_w_pad(conn, ctask);
+ do {
+ status = 0;
+ consumed = iscsi_tcp_recv_skb(conn, skb, offset, 0, &status);
+ offset += consumed;
+ total_consumed += consumed;
+ } while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
- return rc;
+ ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
+ skb->len - offset, status);
+ return total_consumed;
}
/**
- * iscsi_data_xmit - xmit any command into the scheduled connection
- * @conn: iscsi connection
+ * iscsi_sw_sk_state_check - check socket state
+ * @sk: socket
*
- * Notes:
- * The function can return -EAGAIN in which case the caller must
- * re-schedule it again later or recover. '0' return code means
- * successful xmit.
- **/
-static int
-iscsi_data_xmit(struct iscsi_conn *conn)
+ * If the socket is in CLOSE or CLOSE_WAIT we should
+ * not close the connection if there is still some
+ * data pending.
+ */
+static inline int iscsi_sw_sk_state_check(struct sock *sk)
{
- if (unlikely(conn->suspend_tx)) {
- debug_tcp("conn %d Tx suspended!\n", conn->id);
- return 0;
- }
-
- /*
- * Transmit in the following order:
- *
- * 1) un-finished xmit (ctask or mtask)
- * 2) immediate control PDUs
- * 3) write data
- * 4) SCSI commands
- * 5) non-immediate control PDUs
- *
- * No need to lock around __kfifo_get as long as
- * there's one producer and one consumer.
- */
-
- BUG_ON(conn->ctask && conn->mtask);
-
- if (conn->ctask) {
- if (iscsi_ctask_xmit(conn, conn->ctask))
- goto again;
- /* done with this in-progress ctask */
- conn->ctask = NULL;
- }
- if (conn->mtask) {
- if (iscsi_mtask_xmit(conn, conn->mtask))
- goto again;
- /* done with this in-progress mtask */
- conn->mtask = NULL;
- }
-
- /* process immediate first */
- if (unlikely(__kfifo_len(conn->immqueue))) {
- struct iscsi_session *session = conn->session;
- while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
- sizeof(void*))) {
- if (iscsi_mtask_xmit(conn, conn->mtask))
- goto again;
-
- if (conn->mtask->hdr.itt ==
- cpu_to_be32(ISCSI_RESERVED_TAG)) {
- spin_lock_bh(&session->lock);
- __kfifo_put(session->mgmtpool.queue,
- (void*)&conn->mtask, sizeof(void*));
- spin_unlock_bh(&session->lock);
- }
- }
- /* done with this mtask */
- conn->mtask = NULL;
- }
-
- /* process write queue */
- while (__kfifo_get(conn->writequeue, (void*)&conn->ctask,
- sizeof(void*))) {
- if (iscsi_ctask_xmit(conn, conn->ctask))
- goto again;
- }
+ struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
- /* process command queue */
- while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask,
- sizeof(void*))) {
- if (iscsi_ctask_xmit(conn, conn->ctask))
- goto again;
- }
- /* done with this ctask */
- conn->ctask = NULL;
-
- /* process the rest control plane PDUs, if any */
- if (unlikely(__kfifo_len(conn->mgmtqueue))) {
- struct iscsi_session *session = conn->session;
-
- while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
- sizeof(void*))) {
- if (iscsi_mtask_xmit(conn, conn->mtask))
- goto again;
-
- if (conn->mtask->hdr.itt ==
- cpu_to_be32(ISCSI_RESERVED_TAG)) {
- spin_lock_bh(&session->lock);
- __kfifo_put(session->mgmtpool.queue,
- (void*)&conn->mtask,
- sizeof(void*));
- spin_unlock_bh(&session->lock);
- }
- }
- /* done with this mtask */
- conn->mtask = NULL;
+ if ((sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) &&
+ !atomic_read(&sk->sk_rmem_alloc)) {
+ ISCSI_SW_TCP_DBG(conn, "TCP_CLOSE|TCP_CLOSE_WAIT\n");
+ iscsi_conn_failure(conn, ISCSI_ERR_TCP_CONN_CLOSE);
+ return -ECONNRESET;
}
-
return 0;
-
-again:
- if (unlikely(conn->suspend_tx))
- return 0;
-
- return -EAGAIN;
}
-static void
-iscsi_xmitworker(void *data)
-{
- struct iscsi_conn *conn = data;
-
- /*
- * serialize Xmit worker on a per-connection basis.
- */
- mutex_lock(&conn->xmitmutex);
- if (iscsi_data_xmit(conn))
- scsi_queue_work(conn->session->host, &conn->xmitwork);
- mutex_unlock(&conn->xmitmutex);
-}
-
-#define FAILURE_BAD_HOST 1
-#define FAILURE_SESSION_FAILED 2
-#define FAILURE_SESSION_FREED 3
-#define FAILURE_WINDOW_CLOSED 4
-#define FAILURE_SESSION_TERMINATE 5
-
-static int
-iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
+static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
{
- struct Scsi_Host *host;
- int reason = 0;
- struct iscsi_session *session;
- struct iscsi_conn *conn = NULL;
- struct iscsi_cmd_task *ctask = NULL;
-
- sc->scsi_done = done;
- sc->result = 0;
-
- host = sc->device->host;
- session = iscsi_hostdata(host->hostdata);
- BUG_ON(host != session->host);
-
- spin_lock(&session->lock);
+ struct iscsi_conn *conn = sk->sk_user_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ read_descriptor_t rd_desc;
- if (session->state != ISCSI_STATE_LOGGED_IN) {
- if (session->state == ISCSI_STATE_FAILED) {
- reason = FAILURE_SESSION_FAILED;
- goto reject;
- } else if (session->state == ISCSI_STATE_TERMINATE) {
- reason = FAILURE_SESSION_TERMINATE;
- goto fault;
- }
- reason = FAILURE_SESSION_FREED;
- goto fault;
- }
+ read_lock(&sk->sk_callback_lock);
/*
- * Check for iSCSI window and take care of CmdSN wrap-around
+ * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
+ * We set count to 1 because we want the network layer to
+ * hand us all the skbs that are available. iscsi_tcp_recv
+ * handled pdus that cross buffers or pdus that still need data.
*/
- if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
- reason = FAILURE_WINDOW_CLOSED;
- goto reject;
- }
-
- conn = session->leadconn;
-
- __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
- BUG_ON(ctask->sc);
-
- sc->SCp.phase = session->age;
- sc->SCp.ptr = (char*)ctask;
- iscsi_cmd_init(conn, ctask, sc);
-
- __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*));
- debug_scsi(
- "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
- sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
- conn->id, (long)sc, ctask->itt, sc->request_bufflen,
- session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
- spin_unlock(&session->lock);
-
- scsi_queue_work(host, &conn->xmitwork);
- return 0;
-
-reject:
- spin_unlock(&session->lock);
- debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
- return SCSI_MLQUEUE_HOST_BUSY;
-
-fault:
- spin_unlock(&session->lock);
- printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n",
- sc->cmnd[0], reason);
- sc->sense_buffer[0] = 0x70;
- sc->sense_buffer[2] = NOT_READY;
- sc->sense_buffer[7] = 0x6;
- sc->sense_buffer[12] = 0x08;
- sc->sense_buffer[13] = 0x00;
- sc->result = (DID_NO_CONNECT << 16);
- sc->resid = sc->request_bufflen;
- sc->scsi_done(sc);
- return 0;
-}
-
-static int
-iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
-{
- if (depth > ISCSI_MAX_CMD_PER_LUN)
- depth = ISCSI_MAX_CMD_PER_LUN;
- scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
- return sdev->queue_depth;
-}
-
-static int
-iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
-{
- int i;
-
- *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
- if (*items == NULL)
- return -ENOMEM;
-
- q->max = max;
- q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
- if (q->pool == NULL) {
- kfree(*items);
- return -ENOMEM;
- }
-
- q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (q->queue == ERR_PTR(-ENOMEM)) {
- kfree(q->pool);
- kfree(*items);
- return -ENOMEM;
- }
-
- for (i = 0; i < max; i++) {
- q->pool[i] = kmalloc(item_size, GFP_KERNEL);
- if (q->pool[i] == NULL) {
- int j;
-
- for (j = 0; j < i; j++)
- kfree(q->pool[j]);
+ rd_desc.arg.data = conn;
+ rd_desc.count = 1;
+ tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
- kfifo_free(q->queue);
- kfree(q->pool);
- kfree(*items);
- return -ENOMEM;
- }
- memset(q->pool[i], 0, item_size);
- (*items)[i] = q->pool[i];
- __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
- }
- return 0;
-}
+ iscsi_sw_sk_state_check(sk);
-static void
-iscsi_pool_free(struct iscsi_queue *q, void **items)
-{
- int i;
+ read_unlock(&sk->sk_callback_lock);
- for (i = 0; i < q->max; i++)
- kfree(items[i]);
- kfree(q->pool);
- kfree(items);
+ /* If we had to (atomically) map a highmem page,
+ * unmap it now. */
+ iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
}
-static struct iscsi_cls_conn *
-iscsi_conn_create(struct Scsi_Host *shost, uint32_t conn_idx)
+static void iscsi_sw_tcp_state_change(struct sock *sk)
{
- struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
+ struct iscsi_tcp_conn *tcp_conn;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn;
struct iscsi_conn *conn;
- struct iscsi_cls_conn *cls_conn;
-
- cls_conn = iscsi_create_conn(hostdata_session(shost->hostdata),
- conn_idx);
- if (!cls_conn)
- return NULL;
- conn = cls_conn->dd_data;
-
- memset(conn, 0, sizeof(struct iscsi_conn));
- conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
- conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- conn->id = conn_idx;
- conn->exp_statsn = 0;
- conn->tmabort_state = TMABORT_INITIAL;
-
- /* initial operational parameters */
- conn->hdr_size = sizeof(struct iscsi_hdr);
- conn->data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
- conn->max_recv_dlength = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
-
- spin_lock_init(&conn->lock);
-
- /* initialize general xmit PDU commands queue */
- conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (conn->xmitqueue == ERR_PTR(-ENOMEM))
- goto xmitqueue_alloc_fail;
-
- /* initialize write response PDU commands queue */
- conn->writequeue = kfifo_alloc(session->cmds_max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (conn->writequeue == ERR_PTR(-ENOMEM))
- goto writequeue_alloc_fail;
-
- /* initialize general immediate & non-immediate PDU commands queue */
- conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (conn->immqueue == ERR_PTR(-ENOMEM))
- goto immqueue_alloc_fail;
-
- conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
- GFP_KERNEL, NULL);
- if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
- goto mgmtqueue_alloc_fail;
-
- INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
-
- /* allocate login_mtask used for the login/text sequences */
- spin_lock_bh(&session->lock);
- if (!__kfifo_get(session->mgmtpool.queue,
- (void*)&conn->login_mtask,
- sizeof(void*))) {
- spin_unlock_bh(&session->lock);
- goto login_mtask_alloc_fail;
- }
- spin_unlock_bh(&session->lock);
-
- /* allocate initial PDU receive place holder */
- if (conn->data_size <= PAGE_SIZE)
- conn->data = kmalloc(conn->data_size, GFP_KERNEL);
- else
- conn->data = (void*)__get_free_pages(GFP_KERNEL,
- get_order(conn->data_size));
- if (!conn->data)
- goto max_recv_dlenght_alloc_fail;
-
- init_timer(&conn->tmabort_timer);
- mutex_init(&conn->xmitmutex);
- init_waitqueue_head(&conn->ehwait);
-
- return cls_conn;
-
-max_recv_dlenght_alloc_fail:
- spin_lock_bh(&session->lock);
- __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
- sizeof(void*));
- spin_unlock_bh(&session->lock);
-login_mtask_alloc_fail:
- kfifo_free(conn->mgmtqueue);
-mgmtqueue_alloc_fail:
- kfifo_free(conn->immqueue);
-immqueue_alloc_fail:
- kfifo_free(conn->writequeue);
-writequeue_alloc_fail:
- kfifo_free(conn->xmitqueue);
-xmitqueue_alloc_fail:
- iscsi_destroy_conn(cls_conn);
- return NULL;
-}
-
-static void
-iscsi_conn_destroy(struct iscsi_cls_conn *cls_conn)
-{
- struct iscsi_conn *conn = cls_conn->dd_data;
- struct iscsi_session *session = conn->session;
- unsigned long flags;
-
- mutex_lock(&conn->xmitmutex);
- set_bit(SUSPEND_BIT, &conn->suspend_tx);
- if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE && conn->sock) {
- struct sock *sk = conn->sock->sk;
-
- /*
- * conn_start() has never been called!
- * need to cleanup the socket.
- */
- write_lock_bh(&sk->sk_callback_lock);
- set_bit(SUSPEND_BIT, &conn->suspend_rx);
- write_unlock_bh(&sk->sk_callback_lock);
-
- sock_hold(conn->sock->sk);
- iscsi_conn_restore_callbacks(conn);
- sock_put(conn->sock->sk);
- sock_release(conn->sock);
- conn->sock = NULL;
- }
-
- spin_lock_bh(&session->lock);
- conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
- if (session->leadconn == conn) {
- /*
- * leading connection? then give up on recovery.
- */
- session->state = ISCSI_STATE_TERMINATE;
- wake_up(&conn->ehwait);
- }
- spin_unlock_bh(&session->lock);
-
- mutex_unlock(&conn->xmitmutex);
+ struct iscsi_session *session;
+ void (*old_state_change)(struct sock *);
- /*
- * Block until all in-progress commands for this connection
- * time out or fail.
- */
- for (;;) {
- spin_lock_irqsave(session->host->host_lock, flags);
- if (!session->host->host_busy) { /* OK for ERL == 0 */
- spin_unlock_irqrestore(session->host->host_lock, flags);
- break;
- }
- spin_unlock_irqrestore(session->host->host_lock, flags);
- msleep_interruptible(500);
- printk("conn_destroy(): host_busy %d host_failed %d\n",
- session->host->host_busy, session->host->host_failed);
- /*
- * force eh_abort() to unblock
- */
- wake_up(&conn->ehwait);
- }
+ read_lock(&sk->sk_callback_lock);
- /* now free crypto */
- if (conn->hdrdgst_en || conn->datadgst_en) {
- if (conn->tx_tfm)
- crypto_free_tfm(conn->tx_tfm);
- if (conn->rx_tfm)
- crypto_free_tfm(conn->rx_tfm);
- if (conn->data_tx_tfm)
- crypto_free_tfm(conn->data_tx_tfm);
- if (conn->data_rx_tfm)
- crypto_free_tfm(conn->data_rx_tfm);
- }
+ conn = (struct iscsi_conn*)sk->sk_user_data;
+ session = conn->session;
- /* free conn->data, size = MaxRecvDataSegmentLength */
- if (conn->data_size <= PAGE_SIZE)
- kfree(conn->data);
- else
- free_pages((unsigned long)conn->data,
- get_order(conn->data_size));
+ iscsi_sw_sk_state_check(sk);
- spin_lock_bh(&session->lock);
- __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
- sizeof(void*));
- list_del(&conn->item);
- if (list_empty(&session->connections))
- session->leadconn = NULL;
- if (session->leadconn && session->leadconn == conn)
- session->leadconn = container_of(session->connections.next,
- struct iscsi_conn, item);
-
- if (session->leadconn == NULL)
- /* none connections exits.. reset sequencing */
- session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
- spin_unlock_bh(&session->lock);
+ tcp_conn = conn->dd_data;
+ tcp_sw_conn = tcp_conn->dd_data;
+ old_state_change = tcp_sw_conn->old_state_change;
- kfifo_free(conn->xmitqueue);
- kfifo_free(conn->writequeue);
- kfifo_free(conn->immqueue);
- kfifo_free(conn->mgmtqueue);
+ read_unlock(&sk->sk_callback_lock);
- iscsi_destroy_conn(cls_conn);
+ old_state_change(sk);
}
-static int
-iscsi_conn_bind(iscsi_sessionh_t sessionh, iscsi_connh_t connh,
- uint32_t transport_fd, int is_leading)
+/**
+ * iscsi_write_space - Called when more output buffer space is available
+ * @sk: socket space is available for
+ **/
+static void iscsi_sw_tcp_write_space(struct sock *sk)
{
- struct iscsi_session *session = iscsi_ptr(sessionh);
- struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = iscsi_ptr(connh);
- struct sock *sk;
- struct socket *sock;
- int err;
-
- /* lookup for existing socket */
- sock = sockfd_lookup(transport_fd, &err);
- if (!sock) {
- printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
- return -EEXIST;
- }
-
- /* lookup for existing connection */
- spin_lock_bh(&session->lock);
- list_for_each_entry(tmp, &session->connections, item) {
- if (tmp == conn) {
- if (conn->c_stage != ISCSI_CONN_STOPPED ||
- conn->stop_stage == STOP_CONN_TERM) {
- printk(KERN_ERR "iscsi_tcp: can't bind "
- "non-stopped connection (%d:%d)\n",
- conn->c_stage, conn->stop_stage);
- spin_unlock_bh(&session->lock);
- return -EIO;
- }
- break;
- }
- }
- if (tmp != conn) {
- /* bind new iSCSI connection to session */
- conn->session = session;
-
- list_add(&conn->item, &session->connections);
- }
- spin_unlock_bh(&session->lock);
-
- if (conn->stop_stage != STOP_CONN_SUSPEND) {
- /* bind iSCSI connection and socket */
- conn->sock = sock;
-
- /* setup Socket parameters */
- sk = sock->sk;
- sk->sk_reuse = 1;
- sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
- sk->sk_allocation = GFP_ATOMIC;
-
- /* FIXME: disable Nagle's algorithm */
-
- /*
- * Intercept TCP callbacks for sendfile like receive
- * processing.
- */
- iscsi_conn_set_callbacks(conn);
-
- conn->sendpage = conn->sock->ops->sendpage;
-
- /*
- * set receive state machine into initial state
- */
- conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- }
-
- if (is_leading)
- session->leadconn = conn;
-
- /*
- * Unblock xmitworker(), Login Phase will pass through.
- */
- clear_bit(SUSPEND_BIT, &conn->suspend_rx);
- clear_bit(SUSPEND_BIT, &conn->suspend_tx);
+ struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- return 0;
+ tcp_sw_conn->old_write_space(sk);
+ ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
+ iscsi_conn_queue_work(conn);
}
-static int
-iscsi_conn_start(iscsi_connh_t connh)
+static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
{
- struct iscsi_conn *conn = iscsi_ptr(connh);
- struct iscsi_session *session = conn->session;
- struct sock *sk;
-
- /* FF phase warming up... */
-
- if (session == NULL) {
- printk(KERN_ERR "iscsi_tcp: can't start unbound connection\n");
- return -EPERM;
- }
-
- sk = conn->sock->sk;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct sock *sk = tcp_sw_conn->sock->sk;
+ /* assign new callbacks */
write_lock_bh(&sk->sk_callback_lock);
- spin_lock_bh(&session->lock);
- conn->c_stage = ISCSI_CONN_STARTED;
- session->state = ISCSI_STATE_LOGGED_IN;
-
- switch(conn->stop_stage) {
- case STOP_CONN_RECOVER:
- /*
- * unblock eh_abort() if it is blocked. re-try all
- * commands after successful recovery
- */
- session->conn_cnt++;
- conn->stop_stage = 0;
- conn->tmabort_state = TMABORT_INITIAL;
- session->age++;
- wake_up(&conn->ehwait);
- break;
- case STOP_CONN_TERM:
- session->conn_cnt++;
- conn->stop_stage = 0;
- break;
- case STOP_CONN_SUSPEND:
- conn->stop_stage = 0;
- clear_bit(SUSPEND_BIT, &conn->suspend_rx);
- clear_bit(SUSPEND_BIT, &conn->suspend_tx);
- break;
- default:
- break;
- }
- spin_unlock_bh(&session->lock);
+ sk->sk_user_data = conn;
+ tcp_sw_conn->old_data_ready = sk->sk_data_ready;
+ tcp_sw_conn->old_state_change = sk->sk_state_change;
+ tcp_sw_conn->old_write_space = sk->sk_write_space;
+ sk->sk_data_ready = iscsi_sw_tcp_data_ready;
+ sk->sk_state_change = iscsi_sw_tcp_state_change;
+ sk->sk_write_space = iscsi_sw_tcp_write_space;
write_unlock_bh(&sk->sk_callback_lock);
-
- return 0;
}
static void
-iscsi_conn_stop(iscsi_connh_t connh, int flag)
+iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
{
- struct iscsi_conn *conn = iscsi_ptr(connh);
- struct iscsi_session *session = conn->session;
- struct sock *sk;
- unsigned long flags;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct sock *sk = tcp_sw_conn->sock->sk;
- BUG_ON(!conn->sock);
- sk = conn->sock->sk;
+ /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
write_lock_bh(&sk->sk_callback_lock);
- set_bit(SUSPEND_BIT, &conn->suspend_rx);
+ sk->sk_user_data = NULL;
+ sk->sk_data_ready = tcp_sw_conn->old_data_ready;
+ sk->sk_state_change = tcp_sw_conn->old_state_change;
+ sk->sk_write_space = tcp_sw_conn->old_write_space;
+ sk->sk_no_check = 0;
write_unlock_bh(&sk->sk_callback_lock);
+}
- mutex_lock(&conn->xmitmutex);
-
- spin_lock_irqsave(session->host->host_lock, flags);
- spin_lock(&session->lock);
- conn->stop_stage = flag;
- conn->c_stage = ISCSI_CONN_STOPPED;
- set_bit(SUSPEND_BIT, &conn->suspend_tx);
-
- if (flag != STOP_CONN_SUSPEND)
- session->conn_cnt--;
-
- if (session->conn_cnt == 0 || session->leadconn == conn)
- session->state = ISCSI_STATE_FAILED;
-
- spin_unlock(&session->lock);
- spin_unlock_irqrestore(session->host->host_lock, flags);
-
- if (flag == STOP_CONN_TERM || flag == STOP_CONN_RECOVER) {
- struct iscsi_cmd_task *ctask;
- struct iscsi_mgmt_task *mtask;
-
- /*
- * Socket must go now.
- */
- sock_hold(conn->sock->sk);
- iscsi_conn_restore_callbacks(conn);
- sock_put(conn->sock->sk);
+/**
+ * iscsi_sw_tcp_xmit_segment - transmit segment
+ * @tcp_conn: the iSCSI TCP connection
+ * @segment: the buffer to transmnit
+ *
+ * This function transmits as much of the buffer as
+ * the network layer will accept, and returns the number of
+ * bytes transmitted.
+ *
+ * If CRC hashing is enabled, the function will compute the
+ * hash as it goes. When the entire segment has been transmitted,
+ * it will retrieve the hash value and send it as well.
+ */
+static int iscsi_sw_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
+ struct iscsi_segment *segment)
+{
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct socket *sk = tcp_sw_conn->sock;
+ unsigned int copied = 0;
+ int r = 0;
+
+ while (!iscsi_tcp_segment_done(tcp_conn, segment, 0, r)) {
+ struct scatterlist *sg;
+ unsigned int offset, copy;
+ int flags = 0;
+
+ r = 0;
+ offset = segment->copied;
+ copy = segment->size - offset;
+
+ if (segment->total_copied + segment->size < segment->total_size)
+ flags |= MSG_MORE;
+
+ /* Use sendpage if we can; else fall back to sendmsg */
+ if (!segment->data) {
+ sg = segment->sg;
+ offset += segment->sg_offset + sg->offset;
+ r = tcp_sw_conn->sendpage(sk, sg_page(sg), offset,
+ copy, flags);
+ } else {
+ struct msghdr msg = { .msg_flags = flags };
+ struct kvec iov = {
+ .iov_base = segment->data + offset,
+ .iov_len = copy
+ };
- /*
- * flush xmit queues.
- */
- spin_lock_bh(&session->lock);
- while (__kfifo_get(conn->writequeue, (void*)&ctask,
- sizeof(void*)) ||
- __kfifo_get(conn->xmitqueue, (void*)&ctask,
- sizeof(void*))) {
- struct iscsi_r2t_info *r2t;
-
- /*
- * flush ctask's r2t queues
- */
- while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
- sizeof(void*)))
- __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
-
- spin_unlock_bh(&session->lock);
- local_bh_disable();
- iscsi_ctask_cleanup(conn, ctask);
- local_bh_enable();
- spin_lock_bh(&session->lock);
- }
- conn->ctask = NULL;
- while (__kfifo_get(conn->immqueue, (void*)&mtask,
- sizeof(void*)) ||
- __kfifo_get(conn->mgmtqueue, (void*)&mtask,
- sizeof(void*))) {
- __kfifo_put(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*));
+ r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
}
- conn->mtask = NULL;
- spin_unlock_bh(&session->lock);
-
- /*
- * release socket only after we stopped data_xmit()
- * activity and flushed all outstandings
- */
- sock_release(conn->sock);
- conn->sock = NULL;
- /*
- * for connection level recovery we should not calculate
- * header digest. conn->hdr_size used for optimization
- * in hdr_extract() and will be re-negotiated at
- * set_param() time.
- */
- if (flag == STOP_CONN_RECOVER) {
- conn->hdr_size = sizeof(struct iscsi_hdr);
- conn->hdrdgst_en = 0;
- conn->datadgst_en = 0;
+ if (r < 0) {
+ iscsi_tcp_segment_unmap(segment);
+ return r;
}
+ copied += r;
}
- mutex_unlock(&conn->xmitmutex);
+ return copied;
}
-static int
-iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
- char *data, uint32_t data_size)
+/**
+ * iscsi_sw_tcp_xmit - TCP transmit
+ **/
+static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
{
- struct iscsi_session *session = conn->session;
- struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
- struct iscsi_mgmt_task *mtask;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
+ unsigned int consumed = 0;
+ int rc = 0;
- spin_lock_bh(&session->lock);
- if (session->state == ISCSI_STATE_TERMINATE) {
- spin_unlock_bh(&session->lock);
- return -EPERM;
- }
- if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
- hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
+ while (1) {
+ rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
/*
- * Login and Text are sent serially, in
- * request-followed-by-response sequence.
- * Same mtask can be used. Same ITT must be used.
- * Note that login_mtask is preallocated at conn_create().
+ * We may not have been able to send data because the conn
+ * is getting stopped. libiscsi will know so propogate err
+ * for it to do the right thing.
*/
- mtask = conn->login_mtask;
- else {
- BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
- BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
+ if (rc == -EAGAIN)
+ return rc;
+ else if (rc < 0) {
+ rc = ISCSI_ERR_XMIT_FAILED;
+ goto error;
+ } else if (rc == 0)
+ break;
- if (!__kfifo_get(session->mgmtpool.queue,
- (void*)&mtask, sizeof(void*))) {
- spin_unlock_bh(&session->lock);
- return -ENOSPC;
+ consumed += rc;
+
+ if (segment->total_copied >= segment->total_size) {
+ if (segment->done != NULL) {
+ rc = segment->done(tcp_conn, segment);
+ if (rc != 0)
+ goto error;
+ }
}
}
- /*
- * pre-format CmdSN and ExpStatSN for outgoing PDU.
- */
- if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
- hdr->itt = mtask->itt | (conn->id << CID_SHIFT) |
- (session->age << AGE_SHIFT);
- nop->cmdsn = cpu_to_be32(session->cmdsn);
- if (conn->c_stage == ISCSI_CONN_STARTED &&
- !(hdr->opcode & ISCSI_OP_IMMEDIATE))
- session->cmdsn++;
- } else
- /* do not advance CmdSN */
- nop->cmdsn = cpu_to_be32(session->cmdsn);
+ ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
- nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
+ conn->txdata_octets += consumed;
+ return consumed;
- memcpy(&mtask->hdr, hdr, sizeof(struct iscsi_hdr));
-
- iscsi_buf_init_virt(&mtask->headbuf, (char*)&mtask->hdr,
- sizeof(struct iscsi_hdr));
+error:
+ /* Transmit error. We could initiate error recovery
+ * here. */
+ ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
+ iscsi_conn_failure(conn, rc);
+ return -EIO;
+}
- spin_unlock_bh(&session->lock);
+/**
+ * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
+ */
+static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
+{
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
- if (data_size) {
- memcpy(mtask->data, data, data_size);
- mtask->data_count = data_size;
- } else
- mtask->data_count = 0;
+ return segment->total_copied - segment->total_size;
+}
- mtask->xmstate = XMSTATE_IMM_HDR;
+static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
+{
+ struct iscsi_conn *conn = task->conn;
+ int rc;
- if (mtask->data_count) {
- iscsi_buf_init_iov(&mtask->sendbuf, (char*)mtask->data,
- mtask->data_count);
+ while (iscsi_sw_tcp_xmit_qlen(conn)) {
+ rc = iscsi_sw_tcp_xmit(conn);
+ if (rc == 0)
+ return -EAGAIN;
+ if (rc < 0)
+ return rc;
}
- debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
- hdr->opcode, hdr->itt, data_size);
+ return 0;
+}
- /*
- * since send_pdu() could be called at least from two contexts,
- * we need to serialize __kfifo_put, so we don't have to take
- * additional lock on fast data-path
- */
- if (hdr->opcode & ISCSI_OP_IMMEDIATE)
- __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
- else
- __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
+/*
+ * This is called when we're done sending the header.
+ * Simply copy the data_segment to the send segment, and return.
+ */
+static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
+ struct iscsi_segment *segment)
+{
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- scsi_queue_work(session->host, &conn->xmitwork);
+ tcp_sw_conn->out.segment = tcp_sw_conn->out.data_segment;
+ ISCSI_SW_TCP_DBG(tcp_conn->iscsi_conn,
+ "Header done. Next segment size %u total_size %u\n",
+ tcp_sw_conn->out.segment.size,
+ tcp_sw_conn->out.segment.total_size);
return 0;
}
-static int
-iscsi_eh_host_reset(struct scsi_cmnd *sc)
+static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
+ size_t hdrlen)
{
- struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
- struct iscsi_conn *conn = ctask->conn;
- struct iscsi_session *session = conn->session;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- spin_lock_bh(&session->lock);
- if (session->state == ISCSI_STATE_TERMINATE) {
- debug_scsi("failing host reset: session terminated "
- "[CID %d age %d]", conn->id, session->age);
- spin_unlock_bh(&session->lock);
- return FAILED;
- }
- spin_unlock_bh(&session->lock);
+ ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
+ "digest enabled" : "digest disabled");
- debug_scsi("failing connection CID %d due to SCSI host reset "
- "[itt 0x%x age %d]", conn->id, ctask->itt,
- session->age);
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ /* Clear the data segment - needs to be filled in by the
+ * caller using iscsi_tcp_send_data_prep() */
+ memset(&tcp_sw_conn->out.data_segment, 0,
+ sizeof(struct iscsi_segment));
- return SUCCESS;
-}
+ /* If header digest is enabled, compute the CRC and
+ * place the digest into the same buffer. We make
+ * sure that both iscsi_tcp_task and mtask have
+ * sufficient room.
+ */
+ if (conn->hdrdgst_en) {
+ iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen,
+ hdr + hdrlen);
+ hdrlen += ISCSI_DIGEST_SIZE;
+ }
-static void
-iscsi_tmabort_timedout(unsigned long data)
-{
- struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
- struct iscsi_conn *conn = ctask->conn;
- struct iscsi_session *session = conn->session;
+ /* Remember header pointer for later, when we need
+ * to decide whether there's a payload to go along
+ * with the header. */
+ tcp_sw_conn->out.hdr = hdr;
- spin_lock(&session->lock);
- if (conn->tmabort_state == TMABORT_INITIAL) {
- __kfifo_put(session->mgmtpool.queue,
- (void*)&ctask->mtask, sizeof(void*));
- conn->tmabort_state = TMABORT_TIMEDOUT;
- debug_scsi("tmabort timedout [sc %lx itt 0x%x]\n",
- (long)ctask->sc, ctask->itt);
- /* unblock eh_abort() */
- wake_up(&conn->ehwait);
- }
- spin_unlock(&session->lock);
+ iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
+ iscsi_sw_tcp_send_hdr_done, NULL);
}
+/*
+ * Prepare the send buffer for the payload data.
+ * Padding and checksumming will all be taken care
+ * of by the iscsi_segment routines.
+ */
static int
-iscsi_eh_abort(struct scsi_cmnd *sc)
+iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
+ unsigned int count, unsigned int offset,
+ unsigned int len)
{
- int rc;
- struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
- struct iscsi_conn *conn = ctask->conn;
- struct iscsi_session *session = conn->session;
-
- conn->eh_abort_cnt++;
- debug_scsi("aborting [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
-
- /*
- * two cases for ERL=0 here:
- *
- * 1) connection-level failure;
- * 2) recovery due protocol error;
- */
- mutex_lock(&conn->xmitmutex);
- spin_lock_bh(&session->lock);
- if (session->state != ISCSI_STATE_LOGGED_IN) {
- if (session->state == ISCSI_STATE_TERMINATE) {
- spin_unlock_bh(&session->lock);
- mutex_unlock(&conn->xmitmutex);
- goto failed;
- }
- spin_unlock_bh(&session->lock);
- } else {
- struct iscsi_tm *hdr = &conn->tmhdr;
-
- /*
- * Still LOGGED_IN...
- */
-
- if (!ctask->sc || sc->SCp.phase != session->age) {
- /*
- * 1) ctask completed before time out. But session
- * is still ok => Happy Retry.
- * 2) session was re-open during time out of ctask.
- */
- spin_unlock_bh(&session->lock);
- mutex_unlock(&conn->xmitmutex);
- goto success;
- }
- conn->tmabort_state = TMABORT_INITIAL;
- spin_unlock_bh(&session->lock);
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct hash_desc *tx_hash = NULL;
+ unsigned int hdr_spec_len;
- /*
- * ctask timed out but session is OK
- * ERL=0 requires task mgmt abort to be issued on each
- * failed command. requests must be serialized.
- */
- memset(hdr, 0, sizeof(struct iscsi_tm));
- hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
- hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
- hdr->flags |= ISCSI_FLAG_CMD_FINAL;
- memcpy(hdr->lun, ctask->hdr.lun, sizeof(hdr->lun));
- hdr->rtt = ctask->hdr.itt;
- hdr->refcmdsn = ctask->hdr.cmdsn;
-
- rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
- NULL, 0);
- if (rc) {
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- debug_scsi("abort sent failure [itt 0x%x]", ctask->itt);
- } else {
- struct iscsi_r2t_info *r2t;
-
- /*
- * TMF abort vs. TMF response race logic
- */
- spin_lock_bh(&session->lock);
- ctask->mtask = (struct iscsi_mgmt_task *)
- session->mgmt_cmds[(hdr->itt & ITT_MASK) -
- ISCSI_MGMT_ITT_OFFSET];
- /*
- * have to flush r2tqueue to avoid r2t leaks
- */
- while (__kfifo_get(ctask->r2tqueue, (void*)&r2t,
- sizeof(void*))) {
- __kfifo_put(ctask->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- }
- if (conn->tmabort_state == TMABORT_INITIAL) {
- conn->tmfcmd_pdus_cnt++;
- conn->tmabort_timer.expires = 3*HZ + jiffies;
- conn->tmabort_timer.function =
- iscsi_tmabort_timedout;
- conn->tmabort_timer.data = (unsigned long)ctask;
- add_timer(&conn->tmabort_timer);
- debug_scsi("abort sent [itt 0x%x]", ctask->itt);
- } else {
- if (!ctask->sc ||
- conn->tmabort_state == TMABORT_SUCCESS) {
- conn->tmabort_state = TMABORT_INITIAL;
- spin_unlock_bh(&session->lock);
- mutex_unlock(&conn->xmitmutex);
- goto success;
- }
- conn->tmabort_state = TMABORT_INITIAL;
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- }
- spin_unlock_bh(&session->lock);
- }
- }
- mutex_unlock(&conn->xmitmutex);
+ ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
+ conn->datadgst_en ?
+ "digest enabled" : "digest disabled");
+ /* Make sure the datalen matches what the caller
+ said he would send. */
+ hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
+ WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
- /*
- * block eh thread until:
- *
- * 1) abort response;
- * 2) abort timeout;
- * 3) session re-opened;
- * 4) session terminated;
- */
- for (;;) {
- int p_state = session->state;
-
- rc = wait_event_interruptible(conn->ehwait,
- (p_state == ISCSI_STATE_LOGGED_IN ?
- (session->state == ISCSI_STATE_TERMINATE ||
- conn->tmabort_state != TMABORT_INITIAL) :
- (session->state == ISCSI_STATE_TERMINATE ||
- session->state == ISCSI_STATE_LOGGED_IN)));
- if (rc) {
- /* shutdown.. */
- session->state = ISCSI_STATE_TERMINATE;
- goto failed;
- }
+ if (conn->datadgst_en)
+ tx_hash = &tcp_sw_conn->tx_hash;
- if (signal_pending(current))
- flush_signals(current);
-
- if (session->state == ISCSI_STATE_TERMINATE)
- goto failed;
-
- spin_lock_bh(&session->lock);
- if (sc->SCp.phase == session->age &&
- (conn->tmabort_state == TMABORT_TIMEDOUT ||
- conn->tmabort_state == TMABORT_FAILED)) {
- conn->tmabort_state = TMABORT_INITIAL;
- if (!ctask->sc) {
- /*
- * ctask completed before tmf abort response or
- * time out.
- * But session is still ok => Happy Retry.
- */
- spin_unlock_bh(&session->lock);
- break;
- }
- spin_unlock_bh(&session->lock);
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- continue;
- }
- spin_unlock_bh(&session->lock);
- break;
- }
+ return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
+ sg, count, offset, len,
+ NULL, tx_hash);
+}
-success:
- debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
- rc = SUCCESS;
- goto exit;
+static void
+iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
+ size_t len)
+{
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct hash_desc *tx_hash = NULL;
+ unsigned int hdr_spec_len;
-failed:
- debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
- rc = FAILED;
+ ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
+ "digest enabled" : "digest disabled");
-exit:
- del_timer_sync(&conn->tmabort_timer);
+ /* Make sure the datalen matches what the caller
+ said he would send. */
+ hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
+ WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
- mutex_lock(&conn->xmitmutex);
- if (conn->sock) {
- struct sock *sk = conn->sock->sk;
+ if (conn->datadgst_en)
+ tx_hash = &tcp_sw_conn->tx_hash;
- write_lock_bh(&sk->sk_callback_lock);
- iscsi_ctask_cleanup(conn, ctask);
- write_unlock_bh(&sk->sk_callback_lock);
- }
- mutex_unlock(&conn->xmitmutex);
- return rc;
+ iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
+ data, len, NULL, tx_hash);
}
-static int
-iscsi_r2tpool_alloc(struct iscsi_session *session)
+static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
+ unsigned int offset, unsigned int count)
{
- int i;
- int cmd_i;
-
- /*
- * initialize per-task: R2T pool and xmit queue
- */
- for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
- struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
+ struct iscsi_conn *conn = task->conn;
+ int err = 0;
- /*
- * pre-allocated x4 as much r2ts to handle race when
- * target acks DataOut faster than we data_xmit() queues
- * could replenish r2tqueue.
- */
+ iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
- /* R2T pool */
- if (iscsi_pool_init(&ctask->r2tpool, session->max_r2t * 4,
- (void***)&ctask->r2ts, sizeof(struct iscsi_r2t_info))) {
- goto r2t_alloc_fail;
- }
+ if (!count)
+ return 0;
- /* R2T xmit queue */
- ctask->r2tqueue = kfifo_alloc(
- session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
- if (ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
- iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
- goto r2t_alloc_fail;
- }
+ if (!task->sc)
+ iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
+ else {
+ struct scsi_data_buffer *sdb = scsi_out(task->sc);
- /*
- * number of
- * Data-Out PDU's within R2T-sequence can be quite big;
- * using mempool
- */
- ctask->datapool = mempool_create(ISCSI_DTASK_DEFAULT_MAX,
- mempool_alloc_slab, mempool_free_slab, taskcache);
- if (ctask->datapool == NULL) {
- kfifo_free(ctask->r2tqueue);
- iscsi_pool_free(&ctask->r2tpool, (void**)ctask->r2ts);
- goto r2t_alloc_fail;
- }
- INIT_LIST_HEAD(&ctask->dataqueue);
+ err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
+ sdb->table.nents, offset,
+ count);
}
- return 0;
-
-r2t_alloc_fail:
- for (i = 0; i < cmd_i; i++) {
- mempool_destroy(session->cmds[i]->datapool);
- kfifo_free(session->cmds[i]->r2tqueue);
- iscsi_pool_free(&session->cmds[i]->r2tpool,
- (void**)session->cmds[i]->r2ts);
+ if (err) {
+ /* got invalid offset/len */
+ return -EIO;
}
- return -ENOMEM;
+ return 0;
}
-static void
-iscsi_r2tpool_free(struct iscsi_session *session)
+static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
{
- int i;
+ struct iscsi_tcp_task *tcp_task = task->dd_data;
- for (i = 0; i < session->cmds_max; i++) {
- mempool_destroy(session->cmds[i]->datapool);
- kfifo_free(session->cmds[i]->r2tqueue);
- iscsi_pool_free(&session->cmds[i]->r2tpool,
- (void**)session->cmds[i]->r2ts);
- }
+ task->hdr = task->dd_data + sizeof(*tcp_task);
+ task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
+ return 0;
}
-static struct scsi_host_template iscsi_sht = {
- .name = "iSCSI Initiator over TCP/IP, v."
- ISCSI_VERSION_STR,
- .queuecommand = iscsi_queuecommand,
- .change_queue_depth = iscsi_change_queue_depth,
- .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
- .sg_tablesize = ISCSI_SG_TABLESIZE,
- .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
- .eh_abort_handler = iscsi_eh_abort,
- .eh_host_reset_handler = iscsi_eh_host_reset,
- .use_clustering = DISABLE_CLUSTERING,
- .proc_name = "iscsi_tcp",
- .this_id = -1,
-};
+static struct iscsi_cls_conn *
+iscsi_sw_tcp_conn_create(struct iscsi_cls_session *cls_session,
+ uint32_t conn_idx)
+{
+ struct iscsi_conn *conn;
+ struct iscsi_cls_conn *cls_conn;
+ struct iscsi_tcp_conn *tcp_conn;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn;
-static struct iscsi_transport iscsi_tcp_transport;
+ cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
+ conn_idx);
+ if (!cls_conn)
+ return NULL;
+ conn = cls_conn->dd_data;
+ tcp_conn = conn->dd_data;
+ tcp_sw_conn = tcp_conn->dd_data;
+
+ tcp_sw_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
+ CRYPTO_ALG_ASYNC);
+ tcp_sw_conn->tx_hash.flags = 0;
+ if (IS_ERR(tcp_sw_conn->tx_hash.tfm))
+ goto free_conn;
+
+ tcp_sw_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
+ CRYPTO_ALG_ASYNC);
+ tcp_sw_conn->rx_hash.flags = 0;
+ if (IS_ERR(tcp_sw_conn->rx_hash.tfm))
+ goto free_tx_tfm;
+ tcp_conn->rx_hash = &tcp_sw_conn->rx_hash;
-static struct Scsi_Host *
-iscsi_session_create(struct scsi_transport_template *scsit,
- uint32_t initial_cmdsn)
-{
- struct Scsi_Host *shost;
- struct iscsi_session *session;
- int cmd_i;
+ return cls_conn;
- shost = iscsi_transport_create_session(scsit, &iscsi_tcp_transport);
- if (!shost)
- return NULL;
-
- session = iscsi_hostdata(shost->hostdata);
- memset(session, 0, sizeof(struct iscsi_session));
- session->host = shost;
- session->state = ISCSI_STATE_LOGGED_IN;
- session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
- session->cmds_max = ISCSI_XMIT_CMDS_MAX;
- session->cmdsn = initial_cmdsn;
- session->exp_cmdsn = initial_cmdsn + 1;
- session->max_cmdsn = initial_cmdsn + 1;
- session->max_r2t = 1;
-
- /* initialize SCSI PDU commands pool */
- if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
- (void***)&session->cmds, sizeof(struct iscsi_cmd_task)))
- goto cmdpool_alloc_fail;
-
- /* pre-format cmds pool with ITT */
- for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++)
- session->cmds[cmd_i]->itt = cmd_i;
-
- spin_lock_init(&session->lock);
- INIT_LIST_HEAD(&session->connections);
-
- /* initialize immediate command pool */
- if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
- (void***)&session->mgmt_cmds, sizeof(struct iscsi_mgmt_task)))
- goto mgmtpool_alloc_fail;
-
-
- /* pre-format immediate cmds pool with ITT */
- for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
- session->mgmt_cmds[cmd_i]->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
- session->mgmt_cmds[cmd_i]->data = kmalloc(
- DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
- if (!session->mgmt_cmds[cmd_i]->data) {
- int j;
-
- for (j = 0; j < cmd_i; j++)
- kfree(session->mgmt_cmds[j]->data);
- goto immdata_alloc_fail;
- }
- }
+free_tx_tfm:
+ crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
+free_conn:
+ iscsi_conn_printk(KERN_ERR, conn,
+ "Could not create connection due to crc32c "
+ "loading error. Make sure the crc32c "
+ "module is built as a module or into the "
+ "kernel\n");
+ iscsi_tcp_conn_teardown(cls_conn);
+ return NULL;
+}
- if (iscsi_r2tpool_alloc(session))
- goto r2tpool_alloc_fail;
+static void iscsi_sw_tcp_release_conn(struct iscsi_conn *conn)
+{
+ struct iscsi_session *session = conn->session;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct socket *sock = tcp_sw_conn->sock;
- return shost;
+ if (!sock)
+ return;
-r2tpool_alloc_fail:
- for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
- kfree(session->mgmt_cmds[cmd_i]->data);
- iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
-immdata_alloc_fail:
-mgmtpool_alloc_fail:
- iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
-cmdpool_alloc_fail:
- return NULL;
+ sock_hold(sock->sk);
+ iscsi_sw_tcp_conn_restore_callbacks(conn);
+ sock_put(sock->sk);
+
+ spin_lock_bh(&session->lock);
+ tcp_sw_conn->sock = NULL;
+ spin_unlock_bh(&session->lock);
+ sockfd_put(sock);
}
-static void
-iscsi_session_destroy(struct Scsi_Host *shost)
+static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
{
- struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
- int cmd_i;
- struct iscsi_data_task *dtask, *n;
-
- for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
- struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
- list_for_each_entry_safe(dtask, n, &ctask->dataqueue, item) {
- list_del(&dtask->item);
- mempool_free(dtask, ctask->datapool);
- }
- }
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++)
- kfree(session->mgmt_cmds[cmd_i]->data);
+ iscsi_sw_tcp_release_conn(conn);
- iscsi_r2tpool_free(session);
- iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
- iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
+ if (tcp_sw_conn->tx_hash.tfm)
+ crypto_free_hash(tcp_sw_conn->tx_hash.tfm);
+ if (tcp_sw_conn->rx_hash.tfm)
+ crypto_free_hash(tcp_sw_conn->rx_hash.tfm);
- iscsi_transport_destroy_session(shost);
+ iscsi_tcp_conn_teardown(cls_conn);
}
-static int
-iscsi_conn_set_param(iscsi_connh_t connh, enum iscsi_param param,
- uint32_t value)
+static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
{
- struct iscsi_conn *conn = iscsi_ptr(connh);
- struct iscsi_session *session = conn->session;
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct socket *sock = tcp_sw_conn->sock;
- spin_lock_bh(&session->lock);
- if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
- conn->stop_stage != STOP_CONN_RECOVER) {
- printk(KERN_ERR "iscsi_tcp: can not change parameter [%d]\n",
- param);
- spin_unlock_bh(&session->lock);
- return 0;
+ /* userspace may have goofed up and not bound us */
+ if (!sock)
+ return;
+ /*
+ * Make sure our recv side is stopped.
+ * Older tools called conn stop before ep_disconnect
+ * so IO could still be coming in.
+ */
+ write_lock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock);
+ set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
+ write_unlock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock);
+
+ if (sk_sleep(sock->sk) && waitqueue_active(sk_sleep(sock->sk))) {
+ sock->sk->sk_err = EIO;
+ wake_up_interruptible(sk_sleep(sock->sk));
}
- spin_unlock_bh(&session->lock);
- switch(param) {
- case ISCSI_PARAM_MAX_RECV_DLENGTH: {
- char *saveptr = conn->data;
- gfp_t flags = GFP_KERNEL;
+ iscsi_conn_stop(cls_conn, flag);
+ iscsi_sw_tcp_release_conn(conn);
+}
- if (conn->data_size >= value) {
- conn->max_recv_dlength = value;
- break;
- }
+static int iscsi_sw_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock,
+ char *buf, int *port,
+ int (*getname)(struct socket *,
+ struct sockaddr *,
+ int *addrlen))
+{
+ struct sockaddr_storage *addr;
+ struct sockaddr_in6 *sin6;
+ struct sockaddr_in *sin;
+ int rc = 0, len;
- spin_lock_bh(&session->lock);
- if (conn->stop_stage == STOP_CONN_RECOVER)
- flags = GFP_ATOMIC;
- spin_unlock_bh(&session->lock);
-
- if (value <= PAGE_SIZE)
- conn->data = kmalloc(value, flags);
- else
- conn->data = (void*)__get_free_pages(flags,
- get_order(value));
- if (conn->data == NULL) {
- conn->data = saveptr;
- return -ENOMEM;
- }
- if (conn->data_size <= PAGE_SIZE)
- kfree(saveptr);
- else
- free_pages((unsigned long)saveptr,
- get_order(conn->data_size));
- conn->max_recv_dlength = value;
- conn->data_size = value;
- }
- break;
- case ISCSI_PARAM_MAX_XMIT_DLENGTH:
- conn->max_xmit_dlength = value;
- break;
- case ISCSI_PARAM_HDRDGST_EN:
- conn->hdrdgst_en = value;
- conn->hdr_size = sizeof(struct iscsi_hdr);
- if (conn->hdrdgst_en) {
- conn->hdr_size += sizeof(__u32);
- if (!conn->tx_tfm)
- conn->tx_tfm = crypto_alloc_tfm("crc32c", 0);
- if (!conn->tx_tfm)
- return -ENOMEM;
- if (!conn->rx_tfm)
- conn->rx_tfm = crypto_alloc_tfm("crc32c", 0);
- if (!conn->rx_tfm) {
- crypto_free_tfm(conn->tx_tfm);
- return -ENOMEM;
- }
- } else {
- if (conn->tx_tfm)
- crypto_free_tfm(conn->tx_tfm);
- if (conn->rx_tfm)
- crypto_free_tfm(conn->rx_tfm);
- }
- break;
- case ISCSI_PARAM_DATADGST_EN:
- conn->datadgst_en = value;
- if (conn->datadgst_en) {
- if (!conn->data_tx_tfm)
- conn->data_tx_tfm =
- crypto_alloc_tfm("crc32c", 0);
- if (!conn->data_tx_tfm)
- return -ENOMEM;
- if (!conn->data_rx_tfm)
- conn->data_rx_tfm =
- crypto_alloc_tfm("crc32c", 0);
- if (!conn->data_rx_tfm) {
- crypto_free_tfm(conn->data_tx_tfm);
- return -ENOMEM;
- }
- } else {
- if (conn->data_tx_tfm)
- crypto_free_tfm(conn->data_tx_tfm);
- if (conn->data_rx_tfm)
- crypto_free_tfm(conn->data_rx_tfm);
- }
- conn->sendpage = conn->datadgst_en ?
- sock_no_sendpage : conn->sock->ops->sendpage;
- break;
- case ISCSI_PARAM_INITIAL_R2T_EN:
- session->initial_r2t_en = value;
- break;
- case ISCSI_PARAM_MAX_R2T:
- if (session->max_r2t == roundup_pow_of_two(value))
- break;
- iscsi_r2tpool_free(session);
- session->max_r2t = value;
- if (session->max_r2t & (session->max_r2t - 1))
- session->max_r2t = roundup_pow_of_two(session->max_r2t);
- if (iscsi_r2tpool_alloc(session))
- return -ENOMEM;
- break;
- case ISCSI_PARAM_IMM_DATA_EN:
- session->imm_data_en = value;
- break;
- case ISCSI_PARAM_FIRST_BURST:
- session->first_burst = value;
- break;
- case ISCSI_PARAM_MAX_BURST:
- session->max_burst = value;
- break;
- case ISCSI_PARAM_PDU_INORDER_EN:
- session->pdu_inorder_en = value;
- break;
- case ISCSI_PARAM_DATASEQ_INORDER_EN:
- session->dataseq_inorder_en = value;
- break;
- case ISCSI_PARAM_ERL:
- session->erl = value;
- break;
- case ISCSI_PARAM_IFMARKER_EN:
- BUG_ON(value);
- session->ifmarker_en = value;
- break;
- case ISCSI_PARAM_OFMARKER_EN:
- BUG_ON(value);
- session->ofmarker_en = value;
+ addr = kmalloc(sizeof(*addr), GFP_KERNEL);
+ if (!addr)
+ return -ENOMEM;
+
+ if (getname(sock, (struct sockaddr *) addr, &len)) {
+ rc = -ENODEV;
+ goto free_addr;
+ }
+
+ switch (addr->ss_family) {
+ case AF_INET:
+ sin = (struct sockaddr_in *)addr;
+ spin_lock_bh(&conn->session->lock);
+ sprintf(buf, "%pI4", &sin->sin_addr.s_addr);
+ *port = be16_to_cpu(sin->sin_port);
+ spin_unlock_bh(&conn->session->lock);
break;
- default:
+ case AF_INET6:
+ sin6 = (struct sockaddr_in6 *)addr;
+ spin_lock_bh(&conn->session->lock);
+ sprintf(buf, "%pI6", &sin6->sin6_addr);
+ *port = be16_to_cpu(sin6->sin6_port);
+ spin_unlock_bh(&conn->session->lock);
break;
}
+free_addr:
+ kfree(addr);
+ return rc;
+}
+
+static int
+iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session,
+ struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
+ int is_leading)
+{
+ struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
+ struct iscsi_host *ihost = shost_priv(shost);
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct sock *sk;
+ struct socket *sock;
+ int err;
+ /* lookup for existing socket */
+ sock = sockfd_lookup((int)transport_eph, &err);
+ if (!sock) {
+ iscsi_conn_printk(KERN_ERR, conn,
+ "sockfd_lookup failed %d\n", err);
+ return -EEXIST;
+ }
+ /*
+ * copy these values now because if we drop the session
+ * userspace may still want to query the values since we will
+ * be using them for the reconnect
+ */
+ err = iscsi_sw_tcp_get_addr(conn, sock, conn->portal_address,
+ &conn->portal_port, kernel_getpeername);
+ if (err)
+ goto free_socket;
+
+ err = iscsi_sw_tcp_get_addr(conn, sock, ihost->local_address,
+ &ihost->local_port, kernel_getsockname);
+ if (err)
+ goto free_socket;
+
+ err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
+ if (err)
+ goto free_socket;
+
+ /* bind iSCSI connection and socket */
+ tcp_sw_conn->sock = sock;
+
+ /* setup Socket parameters */
+ sk = sock->sk;
+ sk->sk_reuse = 1;
+ sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
+ sk->sk_allocation = GFP_ATOMIC;
+
+ iscsi_sw_tcp_conn_set_callbacks(conn);
+ tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
+ /*
+ * set receive state machine into initial state
+ */
+ iscsi_tcp_hdr_recv_prep(tcp_conn);
return 0;
+
+free_socket:
+ sockfd_put(sock);
+ return err;
}
-static int
-iscsi_session_get_param(struct Scsi_Host *shost,
- enum iscsi_param param, uint32_t *value)
+static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, char *buf,
+ int buflen)
{
- struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_session *session = conn->session;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ int value;
switch(param) {
- case ISCSI_PARAM_INITIAL_R2T_EN:
- *value = session->initial_r2t_en;
- break;
- case ISCSI_PARAM_MAX_R2T:
- *value = session->max_r2t;
- break;
- case ISCSI_PARAM_IMM_DATA_EN:
- *value = session->imm_data_en;
- break;
- case ISCSI_PARAM_FIRST_BURST:
- *value = session->first_burst;
- break;
- case ISCSI_PARAM_MAX_BURST:
- *value = session->max_burst;
- break;
- case ISCSI_PARAM_PDU_INORDER_EN:
- *value = session->pdu_inorder_en;
- break;
- case ISCSI_PARAM_DATASEQ_INORDER_EN:
- *value = session->dataseq_inorder_en;
- break;
- case ISCSI_PARAM_ERL:
- *value = session->erl;
+ case ISCSI_PARAM_HDRDGST_EN:
+ iscsi_set_param(cls_conn, param, buf, buflen);
break;
- case ISCSI_PARAM_IFMARKER_EN:
- *value = session->ifmarker_en;
+ case ISCSI_PARAM_DATADGST_EN:
+ iscsi_set_param(cls_conn, param, buf, buflen);
+ tcp_sw_conn->sendpage = conn->datadgst_en ?
+ sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
break;
- case ISCSI_PARAM_OFMARKER_EN:
- *value = session->ofmarker_en;
+ case ISCSI_PARAM_MAX_R2T:
+ sscanf(buf, "%d", &value);
+ if (value <= 0 || !is_power_of_2(value))
+ return -EINVAL;
+ if (session->max_r2t == value)
+ break;
+ iscsi_tcp_r2tpool_free(session);
+ iscsi_set_param(cls_conn, param, buf, buflen);
+ if (iscsi_tcp_r2tpool_alloc(session))
+ return -ENOMEM;
break;
default:
- return ISCSI_ERR_PARAM_NOT_FOUND;
+ return iscsi_set_param(cls_conn, param, buf, buflen);
}
return 0;
}
-static int
-iscsi_conn_get_param(void *data, enum iscsi_param param, uint32_t *value)
+static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, char *buf)
{
- struct iscsi_conn *conn = data;
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ int len;
switch(param) {
- case ISCSI_PARAM_MAX_RECV_DLENGTH:
- *value = conn->max_recv_dlength;
- break;
- case ISCSI_PARAM_MAX_XMIT_DLENGTH:
- *value = conn->max_xmit_dlength;
- break;
- case ISCSI_PARAM_HDRDGST_EN:
- *value = conn->hdrdgst_en;
+ case ISCSI_PARAM_CONN_PORT:
+ spin_lock_bh(&conn->session->lock);
+ len = sprintf(buf, "%hu\n", conn->portal_port);
+ spin_unlock_bh(&conn->session->lock);
break;
- case ISCSI_PARAM_DATADGST_EN:
- *value = conn->datadgst_en;
+ case ISCSI_PARAM_CONN_ADDRESS:
+ spin_lock_bh(&conn->session->lock);
+ len = sprintf(buf, "%s\n", conn->portal_address);
+ spin_unlock_bh(&conn->session->lock);
break;
default:
- return ISCSI_ERR_PARAM_NOT_FOUND;
+ return iscsi_conn_get_param(cls_conn, param, buf);
}
- return 0;
+ return len;
}
static void
-iscsi_conn_get_stats(iscsi_connh_t connh, struct iscsi_stats *stats)
+iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
+ struct iscsi_stats *stats)
{
- struct iscsi_conn *conn = iscsi_ptr(connh);
-
- stats->txdata_octets = conn->txdata_octets;
- stats->rxdata_octets = conn->rxdata_octets;
- stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
- stats->dataout_pdus = conn->dataout_pdus_cnt;
- stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
- stats->datain_pdus = conn->datain_pdus_cnt;
- stats->r2t_pdus = conn->r2t_pdus_cnt;
- stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
- stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+
stats->custom_length = 3;
strcpy(stats->custom[0].desc, "tx_sendpage_failures");
- stats->custom[0].value = conn->sendpage_failures_cnt;
+ stats->custom[0].value = tcp_sw_conn->sendpage_failures_cnt;
strcpy(stats->custom[1].desc, "rx_discontiguous_hdr");
- stats->custom[1].value = conn->discontiguous_hdr_cnt;
+ stats->custom[1].value = tcp_sw_conn->discontiguous_hdr_cnt;
strcpy(stats->custom[2].desc, "eh_abort_cnt");
stats->custom[2].value = conn->eh_abort_cnt;
+
+ iscsi_tcp_conn_get_stats(cls_conn, stats);
}
-static int
-iscsi_conn_send_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, char *data,
- uint32_t data_size)
+static struct iscsi_cls_session *
+iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
+ uint16_t qdepth, uint32_t initial_cmdsn)
{
- struct iscsi_conn *conn = iscsi_ptr(connh);
- int rc;
+ struct iscsi_cls_session *cls_session;
+ struct iscsi_session *session;
+ struct Scsi_Host *shost;
- mutex_lock(&conn->xmitmutex);
- rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
- mutex_unlock(&conn->xmitmutex);
+ if (ep) {
+ printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
+ return NULL;
+ }
- return rc;
+ shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, 0, 1);
+ if (!shost)
+ return NULL;
+ shost->transportt = iscsi_sw_tcp_scsi_transport;
+ shost->cmd_per_lun = qdepth;
+ shost->max_lun = iscsi_max_lun;
+ shost->max_id = 0;
+ shost->max_channel = 0;
+ shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
+
+ if (iscsi_host_add(shost, NULL))
+ goto free_host;
+
+ cls_session = iscsi_session_setup(&iscsi_sw_tcp_transport, shost,
+ cmds_max, 0,
+ sizeof(struct iscsi_tcp_task) +
+ sizeof(struct iscsi_sw_tcp_hdrbuf),
+ initial_cmdsn, 0);
+ if (!cls_session)
+ goto remove_host;
+ session = cls_session->dd_data;
+
+ shost->can_queue = session->scsi_cmds_max;
+ if (iscsi_tcp_r2tpool_alloc(session))
+ goto remove_session;
+ return cls_session;
+
+remove_session:
+ iscsi_session_teardown(cls_session);
+remove_host:
+ iscsi_host_remove(shost);
+free_host:
+ iscsi_host_free(shost);
+ return NULL;
+}
+
+static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
+{
+ struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
+
+ iscsi_tcp_r2tpool_free(cls_session->dd_data);
+ iscsi_session_teardown(cls_session);
+
+ iscsi_host_remove(shost);
+ iscsi_host_free(shost);
+}
+
+static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
+{
+ set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
+ return 0;
+}
+
+static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
+{
+ blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_ANY);
+ blk_queue_dma_alignment(sdev->request_queue, 0);
+ return 0;
}
-static struct iscsi_transport iscsi_tcp_transport = {
+static struct scsi_host_template iscsi_sw_tcp_sht = {
+ .module = THIS_MODULE,
+ .name = "iSCSI Initiator over TCP/IP",
+ .queuecommand = iscsi_queuecommand,
+ .change_queue_depth = iscsi_change_queue_depth,
+ .can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
+ .sg_tablesize = 4096,
+ .max_sectors = 0xFFFF,
+ .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
+ .eh_abort_handler = iscsi_eh_abort,
+ .eh_device_reset_handler= iscsi_eh_device_reset,
+ .eh_target_reset_handler = iscsi_eh_recover_target,
+ .use_clustering = DISABLE_CLUSTERING,
+ .slave_alloc = iscsi_sw_tcp_slave_alloc,
+ .slave_configure = iscsi_sw_tcp_slave_configure,
+ .target_alloc = iscsi_target_alloc,
+ .proc_name = "iscsi_tcp",
+ .this_id = -1,
+};
+
+static struct iscsi_transport iscsi_sw_tcp_transport = {
.owner = THIS_MODULE,
.name = "tcp",
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
| CAP_DATADGST,
- .host_template = &iscsi_sht,
- .hostdata_size = sizeof(struct iscsi_session),
- .conndata_size = sizeof(struct iscsi_conn),
- .max_conn = 1,
- .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
- .create_session = iscsi_session_create,
- .destroy_session = iscsi_session_destroy,
- .create_conn = iscsi_conn_create,
- .bind_conn = iscsi_conn_bind,
- .destroy_conn = iscsi_conn_destroy,
- .set_param = iscsi_conn_set_param,
- .get_conn_param = iscsi_conn_get_param,
+ .param_mask = ISCSI_MAX_RECV_DLENGTH |
+ ISCSI_MAX_XMIT_DLENGTH |
+ ISCSI_HDRDGST_EN |
+ ISCSI_DATADGST_EN |
+ ISCSI_INITIAL_R2T_EN |
+ ISCSI_MAX_R2T |
+ ISCSI_IMM_DATA_EN |
+ ISCSI_FIRST_BURST |
+ ISCSI_MAX_BURST |
+ ISCSI_PDU_INORDER_EN |
+ ISCSI_DATASEQ_INORDER_EN |
+ ISCSI_ERL |
+ ISCSI_CONN_PORT |
+ ISCSI_CONN_ADDRESS |
+ ISCSI_EXP_STATSN |
+ ISCSI_PERSISTENT_PORT |
+ ISCSI_PERSISTENT_ADDRESS |
+ ISCSI_TARGET_NAME | ISCSI_TPGT |
+ ISCSI_USERNAME | ISCSI_PASSWORD |
+ ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
+ ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
+ ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
+ ISCSI_PING_TMO | ISCSI_RECV_TMO |
+ ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
+ .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
+ ISCSI_HOST_INITIATOR_NAME |
+ ISCSI_HOST_NETDEV_NAME,
+ /* session management */
+ .create_session = iscsi_sw_tcp_session_create,
+ .destroy_session = iscsi_sw_tcp_session_destroy,
+ /* connection management */
+ .create_conn = iscsi_sw_tcp_conn_create,
+ .bind_conn = iscsi_sw_tcp_conn_bind,
+ .destroy_conn = iscsi_sw_tcp_conn_destroy,
+ .set_param = iscsi_sw_tcp_conn_set_param,
+ .get_conn_param = iscsi_sw_tcp_conn_get_param,
.get_session_param = iscsi_session_get_param,
.start_conn = iscsi_conn_start,
- .stop_conn = iscsi_conn_stop,
+ .stop_conn = iscsi_sw_tcp_conn_stop,
+ /* iscsi host params */
+ .get_host_param = iscsi_host_get_param,
+ .set_host_param = iscsi_host_set_param,
+ /* IO */
.send_pdu = iscsi_conn_send_pdu,
- .get_stats = iscsi_conn_get_stats,
+ .get_stats = iscsi_sw_tcp_conn_get_stats,
+ /* iscsi task/cmd helpers */
+ .init_task = iscsi_tcp_task_init,
+ .xmit_task = iscsi_tcp_task_xmit,
+ .cleanup_task = iscsi_tcp_cleanup_task,
+ /* low level pdu helpers */
+ .xmit_pdu = iscsi_sw_tcp_pdu_xmit,
+ .init_pdu = iscsi_sw_tcp_pdu_init,
+ .alloc_pdu = iscsi_sw_tcp_pdu_alloc,
+ /* recovery */
+ .session_recovery_timedout = iscsi_session_recovery_timedout,
};
-static int __init
-iscsi_tcp_init(void)
+static int __init iscsi_sw_tcp_init(void)
{
if (iscsi_max_lun < 1) {
- printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
+ printk(KERN_ERR "iscsi_tcp: Invalid max_lun value of %u\n",
+ iscsi_max_lun);
return -EINVAL;
}
- iscsi_tcp_transport.max_lun = iscsi_max_lun;
-
- taskcache = kmem_cache_create("iscsi_taskcache",
- sizeof(struct iscsi_data_task), 0,
- SLAB_HWCACHE_ALIGN | SLAB_NO_REAP, NULL, NULL);
- if (!taskcache)
- return -ENOMEM;
- if (!iscsi_register_transport(&iscsi_tcp_transport))
- kmem_cache_destroy(taskcache);
+ iscsi_sw_tcp_scsi_transport = iscsi_register_transport(
+ &iscsi_sw_tcp_transport);
+ if (!iscsi_sw_tcp_scsi_transport)
+ return -ENODEV;
return 0;
}
-static void __exit
-iscsi_tcp_exit(void)
+static void __exit iscsi_sw_tcp_exit(void)
{
- iscsi_unregister_transport(&iscsi_tcp_transport);
- kmem_cache_destroy(taskcache);
+ iscsi_unregister_transport(&iscsi_sw_tcp_transport);
}
-module_init(iscsi_tcp_init);
-module_exit(iscsi_tcp_exit);
+module_init(iscsi_sw_tcp_init);
+module_exit(iscsi_sw_tcp_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff