*/
#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 "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");
-#undef DEBUG_TCP
-#define DEBUG_ASSERT
-
-#ifdef DEBUG_TCP
-#define debug_tcp(fmt...) printk(KERN_INFO "tcp: " fmt)
-#else
-#define debug_tcp(fmt...)
-#endif
-
-#ifndef DEBUG_ASSERT
-#ifdef BUG_ON
-#undef BUG_ON
-#endif
-#define BUG_ON(expr)
-#endif
-
-static struct scsi_transport_template *iscsi_tcp_scsi_transport;
-static struct scsi_host_template iscsi_sht;
-static struct iscsi_transport iscsi_tcp_transport;
-static unsigned int iscsi_max_lun = 512;
-module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
-
-static int iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment);
-
-/*
- * Scatterlist handling: inside the iscsi_segment, we
- * remember an index into the scatterlist, and set data/size
- * to the current scatterlist entry. For highmem pages, we
- * kmap as needed.
- *
- * Note that the page is unmapped when we return from
- * TCP's data_ready handler, so we may end up mapping and
- * unmapping the same page repeatedly. The whole reason
- * for this is that we shouldn't keep the page mapped
- * outside the softirq.
- */
-
-/**
- * iscsi_tcp_segment_init_sg - init indicated scatterlist entry
- * @segment: the buffer object
- * @sg: scatterlist
- * @offset: byte offset into that sg entry
- *
- * This function sets up the segment so that subsequent
- * data is copied to the indicated sg entry, at the given
- * offset.
- */
-static inline void
-iscsi_tcp_segment_init_sg(struct iscsi_segment *segment,
- struct scatterlist *sg, unsigned int offset)
-{
- segment->sg = sg;
- segment->sg_offset = offset;
- segment->size = min(sg->length - offset,
- segment->total_size - segment->total_copied);
- segment->data = NULL;
-}
-
-/**
- * iscsi_tcp_segment_map - map the current S/G page
- * @segment: iscsi_segment
- * @recv: 1 if called from recv path
- *
- * We only need to possibly kmap data if scatter lists are being used,
- * because the iscsi passthrough and internal IO paths will never use high
- * mem pages.
- */
-static inline void
-iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv)
-{
- struct scatterlist *sg;
-
- if (segment->data != NULL || !segment->sg)
- return;
-
- sg = segment->sg;
- BUG_ON(segment->sg_mapped);
- BUG_ON(sg->length == 0);
-
- /*
- * If the page count is greater than one it is ok to send
- * to the network layer's zero copy send path. If not we
- * have to go the slow sendmsg path. We always map for the
- * recv path.
- */
- if (page_count(sg_page(sg)) >= 1 && !recv)
- return;
-
- debug_tcp("iscsi_tcp_segment_map %s %p\n", recv ? "recv" : "xmit",
- segment);
- segment->sg_mapped = kmap_atomic(sg_page(sg), KM_SOFTIRQ0);
- segment->data = segment->sg_mapped + sg->offset + segment->sg_offset;
-}
-
-static inline void
-iscsi_tcp_segment_unmap(struct iscsi_segment *segment)
-{
- debug_tcp("iscsi_tcp_segment_unmap %p\n", segment);
-
- if (segment->sg_mapped) {
- debug_tcp("iscsi_tcp_segment_unmap valid\n");
- kunmap_atomic(segment->sg_mapped, KM_SOFTIRQ0);
- segment->sg_mapped = NULL;
- segment->data = NULL;
- }
-}
-
-/*
- * Splice the digest buffer into the buffer
- */
-static inline void
-iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest)
-{
- segment->data = digest;
- segment->digest_len = ISCSI_DIGEST_SIZE;
- segment->total_size += ISCSI_DIGEST_SIZE;
- segment->size = ISCSI_DIGEST_SIZE;
- segment->copied = 0;
- segment->sg = NULL;
- segment->hash = NULL;
-}
-
-/**
- * iscsi_tcp_segment_done - check whether the segment is complete
- * @segment: iscsi segment to check
- * @recv: set to one of this is called from the recv path
- * @copied: number of bytes copied
- *
- * Check if we're done receiving this segment. If the receive
- * buffer is full but we expect more data, move on to the
- * next entry in the scatterlist.
- *
- * If the amount of data we received isn't a multiple of 4,
- * we will transparently receive the pad bytes, too.
- *
- * This function must be re-entrant.
- */
-static inline int
-iscsi_tcp_segment_done(struct iscsi_segment *segment, int recv, unsigned copied)
-{
- static unsigned char padbuf[ISCSI_PAD_LEN];
- struct scatterlist sg;
- unsigned int pad;
-
- debug_tcp("copied %u %u size %u %s\n", segment->copied, copied,
- segment->size, recv ? "recv" : "xmit");
- if (segment->hash && copied) {
- /*
- * If a segment is kmapd we must unmap it before sending
- * to the crypto layer since that will try to kmap it again.
- */
- iscsi_tcp_segment_unmap(segment);
-
- if (!segment->data) {
- sg_init_table(&sg, 1);
- sg_set_page(&sg, sg_page(segment->sg), copied,
- segment->copied + segment->sg_offset +
- segment->sg->offset);
- } else
- sg_init_one(&sg, segment->data + segment->copied,
- copied);
- crypto_hash_update(segment->hash, &sg, copied);
- }
-
- segment->copied += copied;
- if (segment->copied < segment->size) {
- iscsi_tcp_segment_map(segment, recv);
- return 0;
- }
-
- segment->total_copied += segment->copied;
- segment->copied = 0;
- segment->size = 0;
-
- /* Unmap the current scatterlist page, if there is one. */
- iscsi_tcp_segment_unmap(segment);
-
- /* Do we have more scatterlist entries? */
- debug_tcp("total copied %u total size %u\n", segment->total_copied,
- segment->total_size);
- if (segment->total_copied < segment->total_size) {
- /* Proceed to the next entry in the scatterlist. */
- iscsi_tcp_segment_init_sg(segment, sg_next(segment->sg),
- 0);
- iscsi_tcp_segment_map(segment, recv);
- BUG_ON(segment->size == 0);
- return 0;
- }
-
- /* Do we need to handle padding? */
- pad = iscsi_padding(segment->total_copied);
- if (pad != 0) {
- debug_tcp("consume %d pad bytes\n", pad);
- segment->total_size += pad;
- segment->size = pad;
- segment->data = padbuf;
- return 0;
- }
-
- /*
- * Set us up for transferring the data digest. hdr digest
- * is completely handled in hdr done function.
- */
- if (segment->hash) {
- crypto_hash_final(segment->hash, segment->digest);
- iscsi_tcp_segment_splice_digest(segment,
- recv ? segment->recv_digest : segment->digest);
- return 0;
- }
-
- return 1;
-}
-
-/**
- * iscsi_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_tcp_xmit_segment(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment)
-{
- struct socket *sk = tcp_conn->sock;
- unsigned int copied = 0;
- int r = 0;
-
- while (!iscsi_tcp_segment_done(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_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
- };
-
- r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
- }
-
- if (r < 0) {
- iscsi_tcp_segment_unmap(segment);
- if (copied || r == -EAGAIN)
- break;
- return r;
- }
- copied += r;
- }
- return copied;
-}
-
-/**
- * iscsi_tcp_segment_recv - copy data to segment
- * @tcp_conn: the iSCSI TCP connection
- * @segment: the buffer to copy to
- * @ptr: data pointer
- * @len: amount of data available
- *
- * This function copies up to @len bytes to the
- * given buffer, and returns the number of bytes
- * consumed, which can actually be less than @len.
- *
- * If hash digest is enabled, the function will update the
- * hash while copying.
- * Combining these two operations doesn't buy us a lot (yet),
- * but in the future we could implement combined copy+crc,
- * just way we do for network layer checksums.
- */
-static int
-iscsi_tcp_segment_recv(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment, const void *ptr,
- unsigned int len)
-{
- unsigned int copy = 0, copied = 0;
-
- while (!iscsi_tcp_segment_done(segment, 1, copy)) {
- if (copied == len) {
- debug_tcp("iscsi_tcp_segment_recv copied %d bytes\n",
- len);
- break;
- }
-
- copy = min(len - copied, segment->size - segment->copied);
- debug_tcp("iscsi_tcp_segment_recv copying %d\n", copy);
- memcpy(segment->data + segment->copied, ptr + copied, copy);
- copied += copy;
- }
- return copied;
-}
-
-static inline void
-iscsi_tcp_dgst_header(struct hash_desc *hash, const void *hdr, size_t hdrlen,
- unsigned char digest[ISCSI_DIGEST_SIZE])
-{
- struct scatterlist sg;
-
- sg_init_one(&sg, hdr, hdrlen);
- crypto_hash_digest(hash, &sg, hdrlen, digest);
-}
-
-static inline int
-iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment)
-{
- if (!segment->digest_len)
- return 1;
-
- if (memcmp(segment->recv_digest, segment->digest,
- segment->digest_len)) {
- debug_scsi("digest mismatch\n");
- return 0;
- }
-
- return 1;
-}
-
-/*
- * Helper function to set up segment buffer
- */
-static inline void
-__iscsi_segment_init(struct iscsi_segment *segment, size_t size,
- iscsi_segment_done_fn_t *done, struct hash_desc *hash)
-{
- memset(segment, 0, sizeof(*segment));
- segment->total_size = size;
- segment->done = done;
-
- if (hash) {
- segment->hash = hash;
- crypto_hash_init(hash);
- }
-}
-
-static inline void
-iscsi_segment_init_linear(struct iscsi_segment *segment, void *data,
- size_t size, iscsi_segment_done_fn_t *done,
- struct hash_desc *hash)
-{
- __iscsi_segment_init(segment, size, done, hash);
- segment->data = data;
- segment->size = size;
-}
-
-static inline int
-iscsi_segment_seek_sg(struct iscsi_segment *segment,
- struct scatterlist *sg_list, unsigned int sg_count,
- unsigned int offset, size_t size,
- iscsi_segment_done_fn_t *done, struct hash_desc *hash)
-{
- struct scatterlist *sg;
- unsigned int i;
-
- debug_scsi("iscsi_segment_seek_sg offset %u size %llu\n",
- offset, size);
- __iscsi_segment_init(segment, size, done, hash);
- for_each_sg(sg_list, sg, sg_count, i) {
- debug_scsi("sg %d, len %u offset %u\n", i, sg->length,
- sg->offset);
- if (offset < sg->length) {
- iscsi_tcp_segment_init_sg(segment, sg, offset);
- return 0;
- }
- offset -= sg->length;
- }
-
- return ISCSI_ERR_DATA_OFFSET;
-}
-
-/**
- * iscsi_tcp_hdr_recv_prep - prep segment for hdr reception
- * @tcp_conn: iscsi connection to prep for
- *
- * This function always passes NULL for the hash argument, because when this
- * function is called we do not yet know the final size of the header and want
- * to delay the digest processing until we know that.
- */
-static void
-iscsi_tcp_hdr_recv_prep(struct iscsi_tcp_conn *tcp_conn)
-{
- debug_tcp("iscsi_tcp_hdr_recv_prep(%p%s)\n", tcp_conn,
- tcp_conn->iscsi_conn->hdrdgst_en ? ", digest enabled" : "");
- iscsi_segment_init_linear(&tcp_conn->in.segment,
- tcp_conn->in.hdr_buf, sizeof(struct iscsi_hdr),
- iscsi_tcp_hdr_recv_done, NULL);
-}
-
-/*
- * Handle incoming reply to any other type of command
- */
-static int
-iscsi_tcp_data_recv_done(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment)
-{
- struct iscsi_conn *conn = tcp_conn->iscsi_conn;
- int rc = 0;
-
- if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
- return ISCSI_ERR_DATA_DGST;
-
- rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr,
- conn->data, tcp_conn->in.datalen);
- if (rc)
- return rc;
-
- iscsi_tcp_hdr_recv_prep(tcp_conn);
- return 0;
-}
-
-static void
-iscsi_tcp_data_recv_prep(struct iscsi_tcp_conn *tcp_conn)
-{
- struct iscsi_conn *conn = tcp_conn->iscsi_conn;
- struct hash_desc *rx_hash = NULL;
-
- if (conn->datadgst_en &
- !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD))
- rx_hash = &tcp_conn->rx_hash;
-
- iscsi_segment_init_linear(&tcp_conn->in.segment,
- conn->data, tcp_conn->in.datalen,
- iscsi_tcp_data_recv_done, rx_hash);
-}
-
-/*
- * must be called with session lock
- */
-static void
-iscsi_tcp_cleanup_task(struct iscsi_conn *conn, struct iscsi_task *task)
-{
- struct iscsi_tcp_task *tcp_task = task->dd_data;
- struct iscsi_r2t_info *r2t;
-
- /* nothing to do for mgmt tasks */
- if (!task->sc)
- return;
-
- /* flush task's r2t queues */
- while (__kfifo_get(tcp_task->r2tqueue, (void*)&r2t, sizeof(void*))) {
- __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- debug_scsi("iscsi_tcp_cleanup_task pending r2t dropped\n");
- }
-
- r2t = tcp_task->r2t;
- if (r2t != NULL) {
- __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- tcp_task->r2t = NULL;
- }
-}
-
-/**
- * iscsi_data_in - SCSI Data-In Response processing
- * @conn: iscsi connection
- * @task: scsi command task
- **/
-static int
-iscsi_data_in(struct iscsi_conn *conn, struct iscsi_task *task)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_tcp_task *tcp_task = task->dd_data;
- struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
- int datasn = be32_to_cpu(rhdr->datasn);
- unsigned total_in_length = scsi_in(task->sc)->length;
-
- iscsi_update_cmdsn(conn->session, (struct iscsi_nopin*)rhdr);
- if (tcp_conn->in.datalen == 0)
- return 0;
-
- if (tcp_task->exp_datasn != datasn) {
- debug_tcp("%s: task->exp_datasn(%d) != rhdr->datasn(%d)\n",
- __func__, tcp_task->exp_datasn, datasn);
- return ISCSI_ERR_DATASN;
- }
-
- tcp_task->exp_datasn++;
-
- tcp_task->data_offset = be32_to_cpu(rhdr->offset);
- if (tcp_task->data_offset + tcp_conn->in.datalen > total_in_length) {
- debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
- __func__, tcp_task->data_offset,
- tcp_conn->in.datalen, total_in_length);
- return ISCSI_ERR_DATA_OFFSET;
- }
-
- conn->datain_pdus_cnt++;
- return 0;
-}
-
-/**
- * iscsi_solicit_data_init - initialize first Data-Out
- * @conn: iscsi connection
- * @task: 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_task *task,
- struct iscsi_r2t_info *r2t)
-{
- struct iscsi_data *hdr;
-
- hdr = &r2t->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, task->hdr->lun, sizeof(hdr->lun));
- hdr->itt = task->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_r2t_rsp - iSCSI R2T Response processing
- * @conn: iscsi connection
- * @task: scsi command task
- **/
-static int
-iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_task *task)
-{
- struct iscsi_r2t_info *r2t;
- struct iscsi_session *session = conn->session;
- struct iscsi_tcp_task *tcp_task = task->dd_data;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_r2t_rsp *rhdr = (struct iscsi_r2t_rsp *)tcp_conn->in.hdr;
- int r2tsn = be32_to_cpu(rhdr->r2tsn);
- int rc;
-
- if (tcp_conn->in.datalen) {
- iscsi_conn_printk(KERN_ERR, conn,
- "invalid R2t with datalen %d\n",
- tcp_conn->in.datalen);
- return ISCSI_ERR_DATALEN;
- }
-
- if (tcp_task->exp_datasn != r2tsn){
- debug_tcp("%s: task->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
- __func__, tcp_task->exp_datasn, r2tsn);
- return ISCSI_ERR_R2TSN;
- }
-
- /* fill-in new R2T associated with the task */
- iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
-
- if (!task->sc || session->state != ISCSI_STATE_LOGGED_IN) {
- iscsi_conn_printk(KERN_INFO, conn,
- "dropping R2T itt %d in recovery.\n",
- task->itt);
- return 0;
- }
-
- rc = __kfifo_get(tcp_task->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) {
- iscsi_conn_printk(KERN_ERR, conn,
- "invalid R2T with zero data len\n");
- __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- return ISCSI_ERR_DATALEN;
- }
-
- if (r2t->data_length > session->max_burst)
- debug_scsi("invalid R2T with data len %u and max burst %u."
- "Attempting to execute request.\n",
- r2t->data_length, session->max_burst);
-
- r2t->data_offset = be32_to_cpu(rhdr->data_offset);
- if (r2t->data_offset + r2t->data_length > scsi_out(task->sc)->length) {
- iscsi_conn_printk(KERN_ERR, conn,
- "invalid R2T with data len %u at offset %u "
- "and total length %d\n", r2t->data_length,
- r2t->data_offset, scsi_out(task->sc)->length);
- __kfifo_put(tcp_task->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- return ISCSI_ERR_DATALEN;
- }
-
- r2t->ttt = rhdr->ttt; /* no flip */
- r2t->solicit_datasn = 0;
-
- iscsi_solicit_data_init(conn, task, r2t);
-
- tcp_task->exp_datasn = r2tsn + 1;
- __kfifo_put(tcp_task->r2tqueue, (void*)&r2t, sizeof(void*));
- conn->r2t_pdus_cnt++;
-
- iscsi_requeue_task(task);
- return 0;
-}
-
-/*
- * Handle incoming reply to DataIn command
- */
-static int
-iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment)
-{
- struct iscsi_conn *conn = tcp_conn->iscsi_conn;
- struct iscsi_hdr *hdr = tcp_conn->in.hdr;
- int rc;
-
- if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
- return ISCSI_ERR_DATA_DGST;
-
- /* check for non-exceptional status */
- if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
- rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
- if (rc)
- return rc;
- }
-
- iscsi_tcp_hdr_recv_prep(tcp_conn);
- return 0;
-}
-
-/**
- * iscsi_tcp_hdr_dissect - process PDU header
- * @conn: iSCSI connection
- * @hdr: PDU header
- *
- * This function analyzes the header of the PDU received,
- * and performs several sanity checks. If the PDU is accompanied
- * by data, the receive buffer is set up to copy the incoming data
- * to the correct location.
- */
-static int
-iscsi_tcp_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
-{
- int rc = 0, opcode, ahslen;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_task *task;
-
- /* verify PDU length */
- tcp_conn->in.datalen = ntoh24(hdr->dlength);
- if (tcp_conn->in.datalen > conn->max_recv_dlength) {
- iscsi_conn_printk(KERN_ERR, conn,
- "iscsi_tcp: datalen %d > %d\n",
- tcp_conn->in.datalen, conn->max_recv_dlength);
- return ISCSI_ERR_DATALEN;
- }
-
- /* Additional header segments. So far, we don't
- * process additional headers.
- */
- ahslen = hdr->hlength << 2;
-
- opcode = hdr->opcode & ISCSI_OPCODE_MASK;
- /* verify itt (itt encoding: age+cid+itt) */
- rc = iscsi_verify_itt(conn, hdr->itt);
- if (rc)
- return rc;
-
- debug_tcp("opcode 0x%x ahslen %d datalen %d\n",
- opcode, ahslen, tcp_conn->in.datalen);
-
- switch(opcode) {
- case ISCSI_OP_SCSI_DATA_IN:
- spin_lock(&conn->session->lock);
- task = iscsi_itt_to_ctask(conn, hdr->itt);
- if (!task)
- rc = ISCSI_ERR_BAD_ITT;
- else
- rc = iscsi_data_in(conn, task);
- if (rc) {
- spin_unlock(&conn->session->lock);
- break;
- }
-
- if (tcp_conn->in.datalen) {
- struct iscsi_tcp_task *tcp_task = task->dd_data;
- struct hash_desc *rx_hash = NULL;
- struct scsi_data_buffer *sdb = scsi_in(task->sc);
-
- /*
- * Setup copy of Data-In into the Scsi_Cmnd
- * Scatterlist case:
- * We set up the iscsi_segment to point to the next
- * scatterlist entry to copy to. As we go along,
- * we move on to the next scatterlist entry and
- * update the digest per-entry.
- */
- if (conn->datadgst_en &&
- !(conn->session->tt->caps & CAP_DIGEST_OFFLOAD))
- rx_hash = &tcp_conn->rx_hash;
-
- debug_tcp("iscsi_tcp_begin_data_in(%p, offset=%d, "
- "datalen=%d)\n", tcp_conn,
- tcp_task->data_offset,
- tcp_conn->in.datalen);
- rc = iscsi_segment_seek_sg(&tcp_conn->in.segment,
- sdb->table.sgl,
- sdb->table.nents,
- tcp_task->data_offset,
- tcp_conn->in.datalen,
- iscsi_tcp_process_data_in,
- rx_hash);
- spin_unlock(&conn->session->lock);
- return rc;
- }
- rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
- spin_unlock(&conn->session->lock);
- break;
- case ISCSI_OP_SCSI_CMD_RSP:
- if (tcp_conn->in.datalen) {
- iscsi_tcp_data_recv_prep(tcp_conn);
- return 0;
- }
- rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
- break;
- case ISCSI_OP_R2T:
- spin_lock(&conn->session->lock);
- task = iscsi_itt_to_ctask(conn, hdr->itt);
- if (!task)
- rc = ISCSI_ERR_BAD_ITT;
- else if (ahslen)
- rc = ISCSI_ERR_AHSLEN;
- else if (task->sc->sc_data_direction == DMA_TO_DEVICE)
- rc = iscsi_r2t_rsp(conn, task);
- else
- rc = ISCSI_ERR_PROTO;
- spin_unlock(&conn->session->lock);
- break;
- case ISCSI_OP_LOGIN_RSP:
- case ISCSI_OP_TEXT_RSP:
- case ISCSI_OP_REJECT:
- case ISCSI_OP_ASYNC_EVENT:
- /*
- * It is possible that we could get a PDU with a buffer larger
- * than 8K, but there are no targets that currently do this.
- * For now we fail until we find a vendor that needs it
- */
- if (ISCSI_DEF_MAX_RECV_SEG_LEN < tcp_conn->in.datalen) {
- iscsi_conn_printk(KERN_ERR, conn,
- "iscsi_tcp: received buffer of "
- "len %u but conn buffer is only %u "
- "(opcode %0x)\n",
- tcp_conn->in.datalen,
- ISCSI_DEF_MAX_RECV_SEG_LEN, opcode);
- rc = ISCSI_ERR_PROTO;
- break;
- }
-
- /* If there's data coming in with the response,
- * receive it to the connection's buffer.
- */
- if (tcp_conn->in.datalen) {
- iscsi_tcp_data_recv_prep(tcp_conn);
- return 0;
- }
- /* fall through */
- case ISCSI_OP_LOGOUT_RSP:
- case ISCSI_OP_NOOP_IN:
- case ISCSI_OP_SCSI_TMFUNC_RSP:
- rc = iscsi_complete_pdu(conn, hdr, NULL, 0);
- break;
- default:
- rc = ISCSI_ERR_BAD_OPCODE;
- break;
- }
-
- if (rc == 0) {
- /* Anything that comes with data should have
- * been handled above. */
- if (tcp_conn->in.datalen)
- return ISCSI_ERR_PROTO;
- iscsi_tcp_hdr_recv_prep(tcp_conn);
- }
-
- return rc;
-}
-
-/**
- * iscsi_tcp_hdr_recv_done - process PDU header
- *
- * This is the callback invoked when the PDU header has
- * been received. If the header is followed by additional
- * header segments, we go back for more data.
- */
-static int
-iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment)
-{
- struct iscsi_conn *conn = tcp_conn->iscsi_conn;
- struct iscsi_hdr *hdr;
-
- /* Check if there are additional header segments
- * *prior* to computing the digest, because we
- * may need to go back to the caller for more.
- */
- hdr = (struct iscsi_hdr *) tcp_conn->in.hdr_buf;
- if (segment->copied == sizeof(struct iscsi_hdr) && hdr->hlength) {
- /* Bump the header length - the caller will
- * just loop around and get the AHS for us, and
- * call again. */
- unsigned int ahslen = hdr->hlength << 2;
-
- /* Make sure we don't overflow */
- if (sizeof(*hdr) + ahslen > sizeof(tcp_conn->in.hdr_buf))
- return ISCSI_ERR_AHSLEN;
-
- segment->total_size += ahslen;
- segment->size += ahslen;
- return 0;
- }
-
- /* We're done processing the header. See if we're doing
- * header digests; if so, set up the recv_digest buffer
- * and go back for more. */
- if (conn->hdrdgst_en) {
- if (segment->digest_len == 0) {
- /*
- * Even if we offload the digest processing we
- * splice it in so we can increment the skb/segment
- * counters in preparation for the data segment.
- */
- iscsi_tcp_segment_splice_digest(segment,
- segment->recv_digest);
- return 0;
- }
-
- if (!(conn->session->tt->caps & CAP_DIGEST_OFFLOAD)) {
- iscsi_tcp_dgst_header(&tcp_conn->rx_hash, hdr,
- segment->total_copied - ISCSI_DIGEST_SIZE,
- segment->digest);
-
- if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
- return ISCSI_ERR_HDR_DGST;
- }
- }
-
- tcp_conn->in.hdr = hdr;
- return iscsi_tcp_hdr_dissect(conn, hdr);
-}
-
-inline int iscsi_tcp_recv_segment_is_hdr(struct iscsi_tcp_conn *tcp_conn)
-{
- return tcp_conn->in.segment.done == iscsi_tcp_hdr_recv_done;
-}
-
-enum {
- ISCSI_TCP_SEGMENT_DONE, /* curr seg has been processed */
- ISCSI_TCP_SKB_DONE, /* skb is out of data */
- ISCSI_TCP_CONN_ERR, /* iscsi layer has fired a conn err */
- ISCSI_TCP_SUSPENDED, /* conn is suspended */
-};
-
-/**
- * iscsi_tcp_recv_skb - Process skb
- * @conn: iscsi connection
- * @skb: network buffer with header and/or data segment
- * @offset: offset in skb
- * @offload: bool indicating if transfer was offloaded
- */
-int iscsi_tcp_recv_skb(struct iscsi_conn *conn, struct sk_buff *skb,
- unsigned int offset, bool offloaded, int *status)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_segment *segment = &tcp_conn->in.segment;
- struct skb_seq_state seq;
- unsigned int consumed = 0;
- int rc = 0;
-
- debug_tcp("in %d bytes\n", skb->len - offset);
-
- if (unlikely(conn->suspend_rx)) {
- debug_tcp("conn %d Rx suspended!\n", conn->id);
- *status = ISCSI_TCP_SUSPENDED;
- return 0;
- }
-
- if (offloaded) {
- segment->total_copied = segment->total_size;
- goto segment_done;
- }
-
- skb_prepare_seq_read(skb, offset, skb->len, &seq);
- while (1) {
- unsigned int avail;
- const u8 *ptr;
-
- avail = skb_seq_read(consumed, &ptr, &seq);
- if (avail == 0) {
- debug_tcp("no more data avail. Consumed %d\n",
- consumed);
- *status = ISCSI_TCP_SKB_DONE;
- skb_abort_seq_read(&seq);
- goto skb_done;
- }
- BUG_ON(segment->copied >= segment->size);
+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;
- debug_tcp("skb %p ptr=%p avail=%u\n", skb, ptr, avail);
- rc = iscsi_tcp_segment_recv(tcp_conn, segment, ptr, avail);
- BUG_ON(rc == 0);
- consumed += rc;
+static unsigned int iscsi_max_lun = 512;
+module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
- if (segment->total_copied >= segment->total_size) {
- skb_abort_seq_read(&seq);
- goto segment_done;
- }
- }
+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.");
-segment_done:
- *status = ISCSI_TCP_SEGMENT_DONE;
- debug_tcp("segment done\n");
- rc = segment->done(tcp_conn, segment);
- if (rc != 0) {
- *status = ISCSI_TCP_CONN_ERR;
- debug_tcp("Error receiving PDU, errno=%d\n", rc);
- iscsi_conn_failure(conn, rc);
- return 0;
- }
- /* The done() functions sets up the next segment. */
+#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);
-skb_done:
- conn->rxdata_octets += consumed;
- return consumed;
-}
-EXPORT_SYMBOL_GPL(iscsi_tcp_recv_skb);
/**
- * iscsi_tcp_recv - TCP receive in sendfile fashion
+ * 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_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
- unsigned int offset, size_t len)
+ */
+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;
- debug_tcp("in %d bytes\n", skb->len - offset);
+ ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
do {
status = 0;
total_consumed += consumed;
} while (consumed != 0 && status != ISCSI_TCP_SKB_DONE);
- debug_tcp("read %d bytes status %d\n", skb->len - offset, status);
+ ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
+ skb->len - offset, status);
return total_consumed;
}
-static void
-iscsi_tcp_data_ready(struct sock *sk, int flag)
+/**
+ * iscsi_sw_sk_state_check - check socket state
+ * @sk: socket
+ *
+ * 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)
+{
+ struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
+
+ 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;
+}
+
+static void iscsi_sw_tcp_data_ready(struct sock *sk, int flag)
{
struct iscsi_conn *conn = sk->sk_user_data;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
*/
rd_desc.arg.data = conn;
rd_desc.count = 1;
- tcp_read_sock(sk, &rd_desc, iscsi_tcp_recv);
+ tcp_read_sock(sk, &rd_desc, iscsi_sw_tcp_recv);
+
+ iscsi_sw_sk_state_check(sk);
read_unlock(&sk->sk_callback_lock);
iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
}
-static void
-iscsi_tcp_state_change(struct sock *sk)
+static void iscsi_sw_tcp_state_change(struct sock *sk)
{
struct iscsi_tcp_conn *tcp_conn;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn;
struct iscsi_conn *conn;
struct iscsi_session *session;
void (*old_state_change)(struct sock *);
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);
- }
+ iscsi_sw_sk_state_check(sk);
tcp_conn = conn->dd_data;
- old_state_change = tcp_conn->old_state_change;
+ tcp_sw_conn = tcp_conn->dd_data;
+ old_state_change = tcp_sw_conn->old_state_change;
read_unlock(&sk->sk_callback_lock);
* 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)
+static void iscsi_sw_tcp_write_space(struct sock *sk)
{
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;
- tcp_conn->old_write_space(sk);
- debug_tcp("iscsi_write_space: cid %d\n", conn->id);
- scsi_queue_work(conn->session->host, &conn->xmitwork);
+ tcp_sw_conn->old_write_space(sk);
+ ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
+ iscsi_conn_queue_work(conn);
}
-static void
-iscsi_conn_set_callbacks(struct iscsi_conn *conn)
+static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct sock *sk = tcp_conn->sock->sk;
+ 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);
sk->sk_user_data = conn;
- tcp_conn->old_data_ready = sk->sk_data_ready;
- tcp_conn->old_state_change = sk->sk_state_change;
- tcp_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;
+ 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);
}
static void
-iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
+iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
{
- struct sock *sk = tcp_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;
/* 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 = tcp_conn->old_data_ready;
- sk->sk_state_change = tcp_conn->old_state_change;
- sk->sk_write_space = tcp_conn->old_write_space;
+ 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);
}
/**
- * iscsi_xmit - TCP transmit
+ * 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
+ };
+
+ r = kernel_sendmsg(sk, &msg, &iov, 1, copy);
+ }
+
+ if (r < 0) {
+ iscsi_tcp_segment_unmap(segment);
+ return r;
+ }
+ copied += r;
+ }
+ return copied;
+}
+
+/**
+ * iscsi_sw_tcp_xmit - TCP transmit
**/
-static int
-iscsi_xmit(struct iscsi_conn *conn)
+static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_segment *segment = &tcp_conn->out.segment;
+ 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;
while (1) {
- rc = iscsi_tcp_xmit_segment(tcp_conn, segment);
- if (rc < 0) {
+ rc = iscsi_sw_tcp_xmit_segment(tcp_conn, segment);
+ /*
+ * 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.
+ */
+ if (rc == -EAGAIN)
+ return rc;
+ else if (rc < 0) {
rc = ISCSI_ERR_XMIT_FAILED;
goto error;
- }
- if (rc == 0)
+ } else if (rc == 0)
break;
consumed += rc;
}
}
- debug_tcp("xmit %d bytes\n", consumed);
+ ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
conn->txdata_octets += consumed;
return consumed;
error:
/* Transmit error. We could initiate error recovery
* here. */
- debug_tcp("Error sending PDU, errno=%d\n", rc);
+ ISCSI_SW_TCP_DBG(conn, "Error sending PDU, errno=%d\n", rc);
iscsi_conn_failure(conn, rc);
return -EIO;
}
/**
* iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
*/
-static inline int
-iscsi_tcp_xmit_qlen(struct iscsi_conn *conn)
+static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_segment *segment = &tcp_conn->out.segment;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
return segment->total_copied - segment->total_size;
}
-static inline int
-iscsi_tcp_flush(struct iscsi_conn *conn)
+static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
{
+ struct iscsi_conn *conn = task->conn;
int rc;
- while (iscsi_tcp_xmit_qlen(conn)) {
- rc = iscsi_xmit(conn);
+ while (iscsi_sw_tcp_xmit_qlen(conn)) {
+ rc = iscsi_sw_tcp_xmit(conn);
if (rc == 0)
return -EAGAIN;
if (rc < 0)
* This is called when we're done sending the header.
* Simply copy the data_segment to the send segment, and return.
*/
-static int
-iscsi_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_segment *segment)
+static int iscsi_sw_tcp_send_hdr_done(struct iscsi_tcp_conn *tcp_conn,
+ struct iscsi_segment *segment)
{
- tcp_conn->out.segment = tcp_conn->out.data_segment;
- debug_tcp("Header done. Next segment size %u total_size %u\n",
- tcp_conn->out.segment.size, tcp_conn->out.segment.total_size);
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+
+ 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 void
-iscsi_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, size_t hdrlen)
+static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
+ size_t hdrlen)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- debug_tcp("%s(%p%s)\n", __func__, tcp_conn,
- conn->hdrdgst_en? ", digest enabled" : "");
+ ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
+ "digest enabled" : "digest disabled");
/* Clear the data segment - needs to be filled in by the
* caller using iscsi_tcp_send_data_prep() */
- memset(&tcp_conn->out.data_segment, 0, sizeof(struct iscsi_segment));
+ memset(&tcp_sw_conn->out.data_segment, 0,
+ sizeof(struct iscsi_segment));
/* If header digest is enabled, compute the CRC and
* place the digest into the same buffer. We make
* sufficient room.
*/
if (conn->hdrdgst_en) {
- iscsi_tcp_dgst_header(&tcp_conn->tx_hash, hdr, hdrlen,
+ iscsi_tcp_dgst_header(&tcp_sw_conn->tx_hash, hdr, hdrlen,
hdr + hdrlen);
hdrlen += ISCSI_DIGEST_SIZE;
}
/* Remember header pointer for later, when we need
* to decide whether there's a payload to go along
* with the header. */
- tcp_conn->out.hdr = hdr;
+ tcp_sw_conn->out.hdr = hdr;
- iscsi_segment_init_linear(&tcp_conn->out.segment, hdr, hdrlen,
- iscsi_tcp_send_hdr_done, NULL);
+ iscsi_segment_init_linear(&tcp_sw_conn->out.segment, hdr, hdrlen,
+ iscsi_sw_tcp_send_hdr_done, NULL);
}
/*
* of by the iscsi_segment routines.
*/
static int
-iscsi_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
- unsigned int count, unsigned int offset,
- unsigned int len)
+iscsi_sw_tcp_send_data_prep(struct iscsi_conn *conn, struct scatterlist *sg,
+ unsigned int count, unsigned int offset,
+ unsigned int 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;
- debug_tcp("%s(%p, offset=%d, datalen=%d%s)\n", __func__,
- tcp_conn, offset, len,
- conn->datadgst_en? ", digest enabled" : "");
+ 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_conn->out.hdr->dlength);
+ hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
if (conn->datadgst_en)
- tx_hash = &tcp_conn->tx_hash;
+ tx_hash = &tcp_sw_conn->tx_hash;
- return iscsi_segment_seek_sg(&tcp_conn->out.data_segment,
- sg, count, offset, len,
- NULL, tx_hash);
+ return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
+ sg, count, offset, len,
+ NULL, tx_hash);
}
static void
-iscsi_tcp_send_linear_data_prepare(struct iscsi_conn *conn, void *data,
+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;
- debug_tcp("%s(%p, datalen=%d%s)\n", __func__, tcp_conn, len,
- conn->datadgst_en? ", digest enabled" : "");
+ ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", 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_conn->out.hdr->dlength);
+ hdr_spec_len = ntoh24(tcp_sw_conn->out.hdr->dlength);
WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
if (conn->datadgst_en)
- tx_hash = &tcp_conn->tx_hash;
+ tx_hash = &tcp_sw_conn->tx_hash;
- iscsi_segment_init_linear(&tcp_conn->out.data_segment,
+ iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
data, len, NULL, tx_hash);
}
-/**
- * iscsi_solicit_data_cont - initialize next Data-Out
- * @conn: iscsi connection
- * @task: 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 int
-iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_task *task,
- struct iscsi_r2t_info *r2t)
-{
- struct iscsi_data *hdr;
- int new_offset, left;
-
- BUG_ON(r2t->data_length - r2t->sent < 0);
- left = r2t->data_length - r2t->sent;
- if (left == 0)
- return 0;
-
- hdr = &r2t->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, task->hdr->lun, sizeof(hdr->lun));
- hdr->itt = task->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++;
- return 1;
-}
-
-/**
- * iscsi_tcp_task - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
- * @conn: iscsi connection
- * @task: scsi command task
- * @sc: scsi command
- **/
-static int
-iscsi_tcp_task_init(struct iscsi_task *task)
+static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
+ unsigned int offset, unsigned int count)
{
- struct iscsi_tcp_task *tcp_task = task->dd_data;
struct iscsi_conn *conn = task->conn;
- struct scsi_cmnd *sc = task->sc;
- int err;
-
- if (!sc) {
- /*
- * mgmt tasks do not have a scatterlist since they come
- * in from the iscsi interface.
- */
- debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id,
- task->itt);
+ int err = 0;
- /* Prepare PDU, optionally w/ immediate data */
- iscsi_tcp_send_hdr_prep(conn, task->hdr, sizeof(*task->hdr));
+ iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
- /* If we have immediate data, attach a payload */
- if (task->data_count)
- iscsi_tcp_send_linear_data_prepare(conn, task->data,
- task->data_count);
+ if (!count)
return 0;
- }
-
- BUG_ON(__kfifo_len(tcp_task->r2tqueue));
- tcp_task->sent = 0;
- tcp_task->exp_datasn = 0;
- /* Prepare PDU, optionally w/ immediate data */
- debug_scsi("task deq [cid %d itt 0x%x imm %d unsol %d]\n",
- conn->id, task->itt, task->imm_count,
- task->unsol_count);
- iscsi_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
+ if (!task->sc)
+ iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
+ else {
+ struct scsi_data_buffer *sdb = scsi_out(task->sc);
- if (!task->imm_count)
- return 0;
+ err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
+ sdb->table.nents, offset,
+ count);
+ }
- /* If we have immediate data, attach a payload */
- err = iscsi_tcp_send_data_prep(conn, scsi_out(sc)->table.sgl,
- scsi_out(sc)->table.nents,
- 0, task->imm_count);
- if (err)
- return err;
- tcp_task->sent += task->imm_count;
- task->imm_count = 0;
+ if (err) {
+ /* got invalid offset/len */
+ return -EIO;
+ }
return 0;
}
-/*
- * iscsi_tcp_task_xmit - xmit normal PDU task
- * @task: iscsi command task
- *
- * We're expected to return 0 when everything was transmitted succesfully,
- * -EAGAIN if there's still data in the queue, or != 0 for any other kind
- * of error.
- */
-static int
-iscsi_tcp_task_xmit(struct iscsi_task *task)
+static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
{
- struct iscsi_conn *conn = task->conn;
struct iscsi_tcp_task *tcp_task = task->dd_data;
- struct scsi_cmnd *sc = task->sc;
- struct scsi_data_buffer *sdb;
- int rc = 0;
-
-flush:
- /* Flush any pending data first. */
- rc = iscsi_tcp_flush(conn);
- if (rc < 0)
- return rc;
- /* mgmt command */
- if (!sc) {
- if (task->hdr->itt == RESERVED_ITT)
- iscsi_put_task(task);
- return 0;
- }
-
- /* Are we done already? */
- if (sc->sc_data_direction != DMA_TO_DEVICE)
- return 0;
-
- sdb = scsi_out(sc);
- if (task->unsol_count != 0) {
- struct iscsi_data *hdr = &tcp_task->unsol_dtask.hdr;
-
- /* Prepare a header for the unsolicited PDU.
- * The amount of data we want to send will be
- * in task->data_count.
- * FIXME: return the data count instead.
- */
- iscsi_prep_unsolicit_data_pdu(task, hdr);
-
- debug_tcp("unsol dout [itt 0x%x doff %d dlen %d]\n",
- task->itt, tcp_task->sent, task->data_count);
-
- iscsi_tcp_send_hdr_prep(conn, hdr, sizeof(*hdr));
- rc = iscsi_tcp_send_data_prep(conn, sdb->table.sgl,
- sdb->table.nents, tcp_task->sent,
- task->data_count);
- if (rc)
- goto fail;
- tcp_task->sent += task->data_count;
- task->unsol_count -= task->data_count;
- goto flush;
- } else {
- struct iscsi_session *session = conn->session;
- struct iscsi_r2t_info *r2t;
-
- /* All unsolicited PDUs sent. Check for solicited PDUs.
- */
- spin_lock_bh(&session->lock);
- r2t = tcp_task->r2t;
- if (r2t != NULL) {
- /* Continue with this R2T? */
- if (!iscsi_solicit_data_cont(conn, task, r2t)) {
- debug_scsi(" done with r2t %p\n", r2t);
-
- __kfifo_put(tcp_task->r2tpool.queue,
- (void*)&r2t, sizeof(void*));
- tcp_task->r2t = r2t = NULL;
- }
- }
-
- if (r2t == NULL) {
- __kfifo_get(tcp_task->r2tqueue, (void*)&tcp_task->r2t,
- sizeof(void*));
- r2t = tcp_task->r2t;
- }
- spin_unlock_bh(&session->lock);
-
- /* Waiting for more R2Ts to arrive. */
- if (r2t == NULL) {
- debug_tcp("no R2Ts yet\n");
- return 0;
- }
-
- debug_scsi("sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n",
- r2t, r2t->solicit_datasn - 1, task->itt,
- r2t->data_offset + r2t->sent, r2t->data_count);
-
- iscsi_tcp_send_hdr_prep(conn, &r2t->dtask.hdr,
- sizeof(struct iscsi_hdr));
-
- rc = iscsi_tcp_send_data_prep(conn, sdb->table.sgl,
- sdb->table.nents,
- r2t->data_offset + r2t->sent,
- r2t->data_count);
- if (rc)
- goto fail;
- tcp_task->sent += r2t->data_count;
- r2t->sent += r2t->data_count;
- goto flush;
- }
+ task->hdr = task->dd_data + sizeof(*tcp_task);
+ task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
return 0;
-fail:
- iscsi_conn_failure(conn, rc);
- return -EIO;
}
static struct iscsi_cls_conn *
-iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
+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;
- cls_conn = iscsi_conn_setup(cls_session, sizeof(*tcp_conn), conn_idx);
+ cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*tcp_sw_conn),
+ conn_idx);
if (!cls_conn)
return NULL;
conn = cls_conn->dd_data;
- /*
- * due to strange issues with iser these are not set
- * in iscsi_conn_setup
- */
- conn->max_recv_dlength = ISCSI_DEF_MAX_RECV_SEG_LEN;
-
tcp_conn = conn->dd_data;
- tcp_conn->iscsi_conn = conn;
+ tcp_sw_conn = tcp_conn->dd_data;
- tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
- CRYPTO_ALG_ASYNC);
- tcp_conn->tx_hash.flags = 0;
- if (IS_ERR(tcp_conn->tx_hash.tfm))
+ 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_conn->rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
- CRYPTO_ALG_ASYNC);
- tcp_conn->rx_hash.flags = 0;
- if (IS_ERR(tcp_conn->rx_hash.tfm))
+ 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;
return cls_conn;
free_tx_tfm:
- crypto_free_hash(tcp_conn->tx_hash.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_conn_teardown(cls_conn);
+ iscsi_tcp_conn_teardown(cls_conn);
return NULL;
}
-static void
-iscsi_tcp_release_conn(struct iscsi_conn *conn)
+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 socket *sock = tcp_conn->sock;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct socket *sock = tcp_sw_conn->sock;
if (!sock)
return;
sock_hold(sock->sk);
- iscsi_conn_restore_callbacks(tcp_conn);
+ iscsi_sw_tcp_conn_restore_callbacks(conn);
sock_put(sock->sk);
spin_lock_bh(&session->lock);
- tcp_conn->sock = NULL;
+ tcp_sw_conn->sock = NULL;
spin_unlock_bh(&session->lock);
sockfd_put(sock);
}
-static void
-iscsi_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
+static void iscsi_sw_tcp_conn_destroy(struct iscsi_cls_conn *cls_conn)
{
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;
- iscsi_tcp_release_conn(conn);
+ iscsi_sw_tcp_release_conn(conn);
- if (tcp_conn->tx_hash.tfm)
- crypto_free_hash(tcp_conn->tx_hash.tfm);
- if (tcp_conn->rx_hash.tfm)
- crypto_free_hash(tcp_conn->rx_hash.tfm);
+ 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_conn_teardown(cls_conn);
+ iscsi_tcp_conn_teardown(cls_conn);
}
-static void
-iscsi_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
+static void iscsi_sw_tcp_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
{
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;
/* userspace may have goofed up and not bound us */
- if (!tcp_conn->sock)
+ 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_conn->sock->sk->sk_callback_lock);
+ write_lock_bh(&tcp_sw_conn->sock->sk->sk_callback_lock);
set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
- write_unlock_bh(&tcp_conn->sock->sk->sk_callback_lock);
+ 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));
+ }
iscsi_conn_stop(cls_conn, flag);
- iscsi_tcp_release_conn(conn);
+ iscsi_sw_tcp_release_conn(conn);
}
-static int iscsi_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock,
- char *buf, int *port,
- int (*getname)(struct socket *, struct sockaddr *,
- int *addrlen))
+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;
}
static int
-iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
- struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
- int is_leading)
+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;
* userspace may still want to query the values since we will
* be using them for the reconnect
*/
- err = iscsi_tcp_get_addr(conn, sock, conn->portal_address,
- &conn->portal_port, kernel_getpeername);
+ err = iscsi_sw_tcp_get_addr(conn, sock, conn->portal_address,
+ &conn->portal_port, kernel_getpeername);
if (err)
goto free_socket;
- err = iscsi_tcp_get_addr(conn, sock, ihost->local_address,
- &ihost->local_port, kernel_getsockname);
+ err = iscsi_sw_tcp_get_addr(conn, sock, ihost->local_address,
+ &ihost->local_port, kernel_getsockname);
if (err)
goto free_socket;
goto free_socket;
/* bind iSCSI connection and socket */
- tcp_conn->sock = sock;
+ tcp_sw_conn->sock = sock;
/* setup Socket parameters */
sk = sock->sk;
sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */
sk->sk_allocation = GFP_ATOMIC;
- iscsi_conn_set_callbacks(conn);
- tcp_conn->sendpage = tcp_conn->sock->ops->sendpage;
+ iscsi_sw_tcp_conn_set_callbacks(conn);
+ tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage;
/*
* set receive state machine into initial state
*/
return err;
}
-static int
-iscsi_r2tpool_alloc(struct iscsi_session *session)
-{
- 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_task *task = session->cmds[cmd_i];
- struct iscsi_tcp_task *tcp_task = task->dd_data;
-
- /*
- * pre-allocated x4 as much r2ts to handle race when
- * target acks DataOut faster than we data_xmit() queues
- * could replenish r2tqueue.
- */
-
- /* R2T pool */
- if (iscsi_pool_init(&tcp_task->r2tpool, session->max_r2t * 4, NULL,
- sizeof(struct iscsi_r2t_info))) {
- goto r2t_alloc_fail;
- }
-
- /* R2T xmit queue */
- tcp_task->r2tqueue = kfifo_alloc(
- session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
- if (tcp_task->r2tqueue == ERR_PTR(-ENOMEM)) {
- iscsi_pool_free(&tcp_task->r2tpool);
- goto r2t_alloc_fail;
- }
- }
-
- return 0;
-
-r2t_alloc_fail:
- for (i = 0; i < cmd_i; i++) {
- struct iscsi_task *task = session->cmds[i];
- struct iscsi_tcp_task *tcp_task = task->dd_data;
-
- kfifo_free(tcp_task->r2tqueue);
- iscsi_pool_free(&tcp_task->r2tpool);
- }
- return -ENOMEM;
-}
-
-static void
-iscsi_r2tpool_free(struct iscsi_session *session)
-{
- int i;
-
- for (i = 0; i < session->cmds_max; i++) {
- struct iscsi_task *task = session->cmds[i];
- struct iscsi_tcp_task *tcp_task = task->dd_data;
-
- kfifo_free(tcp_task->r2tqueue);
- iscsi_pool_free(&tcp_task->r2tpool);
- }
-}
-
-static int
-iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
- char *buf, int buflen)
+static int iscsi_sw_tcp_conn_set_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, char *buf,
+ int buflen)
{
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) {
break;
case ISCSI_PARAM_DATADGST_EN:
iscsi_set_param(cls_conn, param, buf, buflen);
- tcp_conn->sendpage = conn->datadgst_en ?
- sock_no_sendpage : tcp_conn->sock->ops->sendpage;
+ tcp_sw_conn->sendpage = conn->datadgst_en ?
+ sock_no_sendpage : tcp_sw_conn->sock->ops->sendpage;
break;
case ISCSI_PARAM_MAX_R2T:
sscanf(buf, "%d", &value);
return -EINVAL;
if (session->max_r2t == value)
break;
- iscsi_r2tpool_free(session);
+ iscsi_tcp_r2tpool_free(session);
iscsi_set_param(cls_conn, param, buf, buflen);
- if (iscsi_r2tpool_alloc(session))
+ if (iscsi_tcp_r2tpool_alloc(session))
return -ENOMEM;
break;
default:
return 0;
}
-static int
-iscsi_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
- enum iscsi_param param, char *buf)
+static int iscsi_sw_tcp_conn_get_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, char *buf)
{
struct iscsi_conn *conn = cls_conn->dd_data;
int len;
}
static void
-iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
+iscsi_sw_tcp_conn_get_stats(struct iscsi_cls_conn *cls_conn,
+ struct iscsi_stats *stats)
{
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->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;
stats->custom_length = 3;
strcpy(stats->custom[0].desc, "tx_sendpage_failures");
- stats->custom[0].value = tcp_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 = tcp_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 struct iscsi_cls_session *
-iscsi_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
- uint16_t qdepth, uint32_t initial_cmdsn,
- uint32_t *hostno)
+iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
+ uint16_t qdepth, uint32_t initial_cmdsn)
{
struct iscsi_cls_session *cls_session;
struct iscsi_session *session;
struct Scsi_Host *shost;
- int cmd_i;
if (ep) {
printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
return NULL;
}
- shost = iscsi_host_alloc(&iscsi_sht, 0, qdepth);
+ shost = iscsi_host_alloc(&iscsi_sw_tcp_sht, 0, 1);
if (!shost)
return NULL;
- shost->transportt = iscsi_tcp_scsi_transport;
+ 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;
if (iscsi_host_add(shost, NULL))
goto free_host;
- *hostno = shost->host_no;
- cls_session = iscsi_session_setup(&iscsi_tcp_transport, shost, cmds_max,
- sizeof(struct iscsi_tcp_task),
+ 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;
- for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
- struct iscsi_task *task = session->cmds[cmd_i];
- struct iscsi_tcp_task *tcp_task = task->dd_data;
-
- task->hdr = &tcp_task->hdr.cmd_hdr;
- task->hdr_max = sizeof(tcp_task->hdr) - ISCSI_DIGEST_SIZE;
- }
-
- if (iscsi_r2tpool_alloc(session))
+ if (iscsi_tcp_r2tpool_alloc(session))
goto remove_session;
return cls_session;
return NULL;
}
-static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
+static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
{
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
- iscsi_r2tpool_free(cls_session->dd_data);
+ iscsi_tcp_r2tpool_free(cls_session->dd_data);
iscsi_session_teardown(cls_session);
iscsi_host_remove(shost);
iscsi_host_free(shost);
}
-static int iscsi_tcp_slave_configure(struct scsi_device *sdev)
+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 scsi_host_template iscsi_sht = {
+static struct scsi_host_template iscsi_sw_tcp_sht = {
.module = THIS_MODULE,
.name = "iSCSI Initiator over TCP/IP",
.queuecommand = iscsi_queuecommand,
.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_target_reset,
+ .eh_target_reset_handler = iscsi_eh_recover_target,
.use_clustering = DISABLE_CLUSTERING,
- .slave_configure = iscsi_tcp_slave_configure,
+ .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_tcp_transport = {
+static struct iscsi_transport iscsi_sw_tcp_transport = {
.owner = THIS_MODULE,
.name = "tcp",
.caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
ISCSI_USERNAME | ISCSI_PASSWORD |
ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
- ISCSI_LU_RESET_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_tcp_session_create,
- .destroy_session = iscsi_tcp_session_destroy,
+ .create_session = iscsi_sw_tcp_session_create,
+ .destroy_session = iscsi_sw_tcp_session_destroy,
/* connection management */
- .create_conn = iscsi_tcp_conn_create,
- .bind_conn = iscsi_tcp_conn_bind,
- .destroy_conn = iscsi_tcp_conn_destroy,
- .set_param = iscsi_conn_set_param,
- .get_conn_param = iscsi_tcp_conn_get_param,
+ .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_tcp_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 "iscsi_tcp: Invalid max_lun value of %u\n",
return -EINVAL;
}
- iscsi_tcp_scsi_transport = iscsi_register_transport(
- &iscsi_tcp_transport);
- if (!iscsi_tcp_scsi_transport)
+ 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);
+ 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