*/
#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_sw_tcp_scsi_transport;
+static struct scsi_host_template iscsi_sw_tcp_sht;
+static struct iscsi_transport iscsi_sw_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_chunk *chunk);
-
-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)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-
- crypto_hash_digest(&tcp_conn->tx_hash, &buf->sg, buf->sg.length, crc);
- buf->sg.length += sizeof(u32);
-}
-
-/*
- * Scatterlist handling: inside the iscsi_chunk, 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_chunk_init_sg - init indicated scatterlist entry
- * @chunk: the buffer object
- * @idx: index into scatterlist
- * @offset: byte offset into that sg entry
- *
- * This function sets up the chunk so that subsequent
- * data is copied to the indicated sg entry, at the given
- * offset.
- */
-static inline void
-iscsi_tcp_chunk_init_sg(struct iscsi_chunk *chunk,
- unsigned int idx, unsigned int offset)
-{
- struct scatterlist *sg;
-
- BUG_ON(chunk->sg == NULL);
-
- sg = &chunk->sg[idx];
- chunk->sg_index = idx;
- chunk->sg_offset = offset;
- chunk->size = min(sg->length - offset, chunk->total_size);
- chunk->data = NULL;
-}
-
-/**
- * iscsi_tcp_chunk_map - map the current S/G page
- * @chunk: iscsi chunk
- *
- * 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_chunk_map(struct iscsi_chunk *chunk)
-{
- struct scatterlist *sg;
-
- if (chunk->data != NULL || !chunk->sg)
- return;
-
- sg = &chunk->sg[chunk->sg_index];
- BUG_ON(chunk->sg_mapped);
- BUG_ON(sg->length == 0);
- chunk->sg_mapped = kmap_atomic(sg->page, KM_SOFTIRQ0);
- chunk->data = chunk->sg_mapped + sg->offset + chunk->sg_offset;
-}
-
-static inline void
-iscsi_tcp_chunk_unmap(struct iscsi_chunk *chunk)
-{
- if (chunk->sg_mapped) {
- kunmap_atomic(chunk->sg_mapped, KM_SOFTIRQ0);
- chunk->sg_mapped = NULL;
- chunk->data = NULL;
- }
-}
-
-/*
- * Splice the digest buffer into the buffer
- */
-static inline void
-iscsi_tcp_chunk_splice_digest(struct iscsi_chunk *chunk, void *digest)
-{
- chunk->data = digest;
- chunk->digest_len = ISCSI_DIGEST_SIZE;
- chunk->total_size += ISCSI_DIGEST_SIZE;
- chunk->size = ISCSI_DIGEST_SIZE;
- chunk->copied = 0;
- chunk->sg = NULL;
- chunk->sg_index = 0;
- chunk->hash = NULL;
-}
-
-/**
- * iscsi_tcp_chunk_done - check whether the chunk is complete
- * @chunk: iscsi chunk to check
- *
- * Check if we're done receiving this chunk. 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_chunk_done(struct iscsi_chunk *chunk)
-{
- static unsigned char padbuf[ISCSI_PAD_LEN];
-
- if (chunk->copied < chunk->size) {
- iscsi_tcp_chunk_map(chunk);
- return 0;
- }
-
- chunk->total_copied += chunk->copied;
- chunk->copied = 0;
- chunk->size = 0;
-
- /* Unmap the current scatterlist page, if there is one. */
- iscsi_tcp_chunk_unmap(chunk);
-
- /* Do we have more scatterlist entries? */
- if (chunk->total_copied < chunk->total_size) {
- /* Proceed to the next entry in the scatterlist. */
- iscsi_tcp_chunk_init_sg(chunk, chunk->sg_index + 1, 0);
- iscsi_tcp_chunk_map(chunk);
- BUG_ON(chunk->size == 0);
- return 0;
- }
-
- /* Do we need to handle padding? */
- if (chunk->total_copied & (ISCSI_PAD_LEN-1)) {
- unsigned int pad;
-
- pad = ISCSI_PAD_LEN - (chunk->total_copied & (ISCSI_PAD_LEN-1));
- debug_tcp("consume %d pad bytes\n", pad);
- chunk->total_size += pad;
- chunk->size = pad;
- chunk->data = padbuf;
- return 0;
- }
-
- /*
- * Set us up for receiving the data digest. hdr digest
- * is completely handled in hdr done function.
- */
- if (chunk->hash) {
- if (chunk->digest_len == 0) {
- crypto_hash_final(chunk->hash, chunk->digest);
- iscsi_tcp_chunk_splice_digest(chunk,
- chunk->recv_digest);
- return 0;
- }
- }
-
- return 1;
-}
-
-/**
- * iscsi_tcp_chunk_recv - copy data to chunk
- * @tcp_conn: the iSCSI TCP connection
- * @chunk: 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_chunk_recv(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_chunk *chunk, const void *ptr,
- unsigned int len)
-{
- struct scatterlist sg;
- unsigned int copy, copied = 0;
-
- while (!iscsi_tcp_chunk_done(chunk)) {
- if (copied == len)
- goto out;
-
- copy = min(len - copied, chunk->size - chunk->copied);
- memcpy(chunk->data + chunk->copied, ptr + copied, copy);
-
- if (chunk->hash) {
- sg_init_one(&sg, ptr + copied, copy);
- crypto_hash_update(chunk->hash, &sg, copy);
- }
- chunk->copied += copy;
- copied += copy;
- }
-
-out:
- 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_chunk *chunk)
-{
- if (!chunk->digest_len)
- return 1;
-
- if (memcmp(chunk->recv_digest, chunk->digest, chunk->digest_len)) {
- debug_scsi("digest mismatch\n");
- return 0;
- }
-
- return 1;
-}
-
-/*
- * Helper function to set up chunk buffer
- */
-static inline void
-__iscsi_chunk_init(struct iscsi_chunk *chunk, size_t size,
- iscsi_chunk_done_fn_t *done, struct hash_desc *hash)
-{
- memset(chunk, 0, sizeof(*chunk));
- chunk->total_size = size;
- chunk->done = done;
-
- if (hash) {
- chunk->hash = hash;
- crypto_hash_init(hash);
- }
-}
-
-static inline void
-iscsi_chunk_init_linear(struct iscsi_chunk *chunk, void *data, size_t size,
- iscsi_chunk_done_fn_t *done, struct hash_desc *hash)
-{
- __iscsi_chunk_init(chunk, size, done, hash);
- chunk->data = data;
- chunk->size = size;
-}
-
-static inline int
-iscsi_chunk_seek_sg(struct iscsi_chunk *chunk,
- struct scatterlist *sg, unsigned int sg_count,
- unsigned int offset, size_t size,
- iscsi_chunk_done_fn_t *done, struct hash_desc *hash)
-{
- unsigned int i;
-
- __iscsi_chunk_init(chunk, size, done, hash);
- for (i = 0; i < sg_count; ++i) {
- if (offset < sg[i].length) {
- chunk->sg = sg;
- chunk->sg_count = sg_count;
- iscsi_tcp_chunk_init_sg(chunk, i, offset);
- return 0;
- }
- offset -= sg[i].length;
- }
-
- return ISCSI_ERR_DATA_OFFSET;
-}
-
-/**
- * iscsi_tcp_hdr_recv_prep - prep chunk 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_chunk_init_linear(&tcp_conn->in.chunk,
- 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_chunk *chunk)
-{
- struct iscsi_conn *conn = tcp_conn->iscsi_conn;
- int rc = 0;
-
- if (!iscsi_tcp_dgst_verify(tcp_conn, chunk))
- 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)
- rx_hash = &tcp_conn->rx_hash;
-
- iscsi_chunk_init_linear(&tcp_conn->in.chunk,
- conn->data, tcp_conn->in.datalen,
- iscsi_tcp_data_recv_done, rx_hash);
-}
-
-/*
- * must be called with session lock
- */
-static void
-iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_r2t_info *r2t;
- struct scsi_cmnd *sc;
-
- /* flush ctask's r2t queues */
- while (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*))) {
- __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n");
- }
-
- sc = ctask->sc;
- if (unlikely(!sc))
- return;
-
- tcp_ctask->xmstate = XMSTATE_IDLE;
- tcp_ctask->r2t = NULL;
-}
-
-/**
- * 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)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)tcp_conn->in.hdr;
- struct iscsi_session *session = conn->session;
- struct scsi_cmnd *sc = ctask->sc;
- int datasn = be32_to_cpu(rhdr->datasn);
-
- iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
- /*
- * setup Data-In byte counter (gets decremented..)
- */
- ctask->data_count = tcp_conn->in.datalen;
-
- if (tcp_conn->in.datalen == 0)
- return 0;
-
- if (tcp_ctask->exp_datasn != datasn) {
- debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->datasn(%d)\n",
- __FUNCTION__, tcp_ctask->exp_datasn, datasn);
- return ISCSI_ERR_DATASN;
- }
-
- tcp_ctask->exp_datasn++;
-
- tcp_ctask->data_offset = be32_to_cpu(rhdr->offset);
- if (tcp_ctask->data_offset + tcp_conn->in.datalen > scsi_bufflen(sc)) {
- debug_tcp("%s: data_offset(%d) + data_len(%d) > total_length_in(%d)\n",
- __FUNCTION__, tcp_ctask->data_offset,
- tcp_conn->in.datalen, scsi_bufflen(sc));
- return ISCSI_ERR_DATA_OFFSET;
- }
-
- if (rhdr->flags & ISCSI_FLAG_DATA_STATUS) {
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
- conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
- if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
- ISCSI_FLAG_DATA_OVERFLOW)) {
- int res_count = be32_to_cpu(rhdr->residual_count);
-
- if (res_count > 0 &&
- (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
- res_count <= scsi_bufflen(sc)))
- scsi_set_resid(sc, res_count);
- else
- sc->result = (DID_BAD_TARGET << 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 scsi_cmnd *sc = ctask->sc;
- int i, sg_count = 0;
- struct scatterlist *sg;
-
- 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, 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_iov(&r2t->headbuf, (char*)hdr,
- sizeof(struct iscsi_hdr));
-
- sg = scsi_sglist(sc);
- r2t->sg = NULL;
- for (i = 0; i < scsi_sg_count(sc); 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);
-}
-
-/**
- * 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_tcp_cmd_task *tcp_ctask = ctask->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) {
- printk(KERN_ERR "iscsi_tcp: invalid R2t with datalen %d\n",
- tcp_conn->in.datalen);
- return ISCSI_ERR_DATALEN;
- }
-
- if (tcp_ctask->exp_datasn != r2tsn){
- debug_tcp("%s: ctask->exp_datasn(%d) != rhdr->r2tsn(%d)\n",
- __FUNCTION__, tcp_ctask->exp_datasn, r2tsn);
- return ISCSI_ERR_R2TSN;
- }
-
- /* fill-in new R2T associated with the task */
- spin_lock(&session->lock);
- iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
-
- if (!ctask->sc || 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(tcp_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) {
- printk(KERN_ERR "iscsi_tcp: invalid R2T with zero data len\n");
- spin_unlock(&session->lock);
- 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_bufflen(ctask->sc)) {
- spin_unlock(&session->lock);
- printk(KERN_ERR "iscsi_tcp: invalid R2T with data len %u at "
- "offset %u and total length %d\n", r2t->data_length,
- r2t->data_offset, scsi_bufflen(ctask->sc));
- return ISCSI_ERR_DATALEN;
- }
-
- r2t->ttt = rhdr->ttt; /* no flip */
- r2t->solicit_datasn = 0;
-
- iscsi_solicit_data_init(conn, ctask, r2t);
-
- tcp_ctask->exp_datasn = r2tsn + 1;
- __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
- tcp_ctask->xmstate |= XMSTATE_SOL_HDR_INIT;
- conn->r2t_pdus_cnt++;
-
- iscsi_requeue_ctask(ctask);
- spin_unlock(&session->lock);
+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.");
- return 0;
-}
+#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);
-/*
- * Handle incoming reply to DataIn command
- */
-static int
-iscsi_tcp_process_data_in(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_chunk *chunk)
-{
- 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, chunk))
- 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.
+ * 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_hdr_dissect(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
+static int iscsi_sw_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
+ unsigned int offset, size_t len)
{
- int rc = 0, opcode, ahslen;
- struct iscsi_session *session = conn->session;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_cmd_task *ctask;
- uint32_t itt;
-
- /* verify PDU length */
- tcp_conn->in.datalen = ntoh24(hdr->dlength);
- if (tcp_conn->in.datalen > conn->max_recv_dlength) {
- printk(KERN_ERR "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 == ISCSI_ERR_NO_SCSI_CMD) {
- /* XXX: what does this do? */
- tcp_conn->in.datalen = 0; /* force drop */
- return 0;
- } else 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:
- ctask = session->cmds[itt];
- rc = iscsi_data_rsp(conn, ctask);
- if (rc)
- return rc;
- if (tcp_conn->in.datalen) {
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct hash_desc *rx_hash = NULL;
-
- /*
- * Setup copy of Data-In into the Scsi_Cmnd
- * Scatterlist case:
- * We set up the iscsi_chunk 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)
- rx_hash = &tcp_conn->rx_hash;
-
- debug_tcp("iscsi_tcp_begin_data_in(%p, offset=%d, "
- "datalen=%d)\n", tcp_conn,
- tcp_ctask->data_offset,
- tcp_conn->in.datalen);
- return iscsi_chunk_seek_sg(&tcp_conn->in.chunk,
- scsi_sglist(ctask->sc),
- scsi_sg_count(ctask->sc),
- tcp_ctask->data_offset,
- tcp_conn->in.datalen,
- iscsi_tcp_process_data_in,
- rx_hash);
- }
- /* fall through */
- 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:
- ctask = session->cmds[itt];
- if (ahslen)
- rc = ISCSI_ERR_AHSLEN;
- else if (ctask->sc->sc_data_direction == DMA_TO_DEVICE)
- rc = iscsi_r2t_rsp(conn, ctask);
- else
- rc = ISCSI_ERR_PROTO;
- 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) {
- printk(KERN_ERR "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;
- }
+ struct iscsi_conn *conn = rd_desc->arg.data;
+ unsigned int consumed, total_consumed = 0;
+ int status;
- /* 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;
- }
+ ISCSI_SW_TCP_DBG(conn, "in %d bytes\n", skb->len - offset);
- 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);
- }
+ 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;
-}
-
-static inline void
-partial_sg_digest_update(struct hash_desc *desc, struct scatterlist *sg,
- int offset, int length)
-{
- struct scatterlist temp;
-
- sg_init_table(&temp, 1);
- sg_set_page(&temp, sg_page(sg), length, offset);
- crypto_hash_update(desc, &temp, length);
+ ISCSI_SW_TCP_DBG(conn, "read %d bytes status %d\n",
+ skb->len - offset, status);
+ return total_consumed;
}
/**
- * iscsi_tcp_hdr_recv_done - process PDU header
+ * iscsi_sw_sk_state_check - check socket state
+ * @sk: socket
*
- * 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.
+ * If the socket is in CLOSE or CLOSE_WAIT we should
+ * not close the connection if there is still some
+ * data pending.
*/
-static int
-iscsi_tcp_hdr_recv_done(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_chunk *chunk)
-{
- 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 (chunk->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;
-
- chunk->total_size += ahslen;
- chunk->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 (chunk->digest_len == 0) {
- iscsi_tcp_chunk_splice_digest(chunk,
- chunk->recv_digest);
- return 0;
- }
- iscsi_tcp_dgst_header(&tcp_conn->rx_hash, hdr,
- chunk->total_copied - ISCSI_DIGEST_SIZE,
- chunk->digest);
-
- if (!iscsi_tcp_dgst_verify(tcp_conn, chunk))
- return ISCSI_ERR_HDR_DGST;
- }
-
- tcp_conn->in.hdr = hdr;
- return iscsi_tcp_hdr_dissect(conn, hdr);
-}
-
-/**
- * iscsi_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 inline int iscsi_sw_sk_state_check(struct sock *sk)
{
- struct iscsi_conn *conn = rd_desc->arg.data;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_chunk *chunk = &tcp_conn->in.chunk;
- 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);
- return 0;
- }
-
- 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)
- break;
- BUG_ON(chunk->copied >= chunk->size);
-
- debug_tcp("skb %p ptr=%p avail=%u\n", skb, ptr, avail);
- rc = iscsi_tcp_chunk_recv(tcp_conn, chunk, ptr, avail);
- BUG_ON(rc == 0);
- consumed += rc;
-
- if (chunk->total_copied >= chunk->total_size) {
- rc = chunk->done(tcp_conn, chunk);
- if (rc != 0) {
- skb_abort_seq_read(&seq);
- goto error;
- }
+ struct iscsi_conn *conn = (struct iscsi_conn*)sk->sk_user_data;
- /* The done() functions sets up the
- * next chunk. */
- }
+ 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;
}
-
- conn->rxdata_octets += consumed;
- return consumed;
-
-error:
- debug_tcp("Error receiving PDU, errno=%d\n", rc);
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
return 0;
}
-static void
-iscsi_tcp_data_ready(struct sock *sk, int flag)
+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);
/* If we had to (atomically) map a highmem page,
* unmap it now. */
- iscsi_tcp_chunk_unmap(&tcp_conn->in.chunk);
+ 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 *);
- 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);
- }
-
- tcp_conn = conn->dd_data;
- old_state_change = tcp_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;
- struct iscsi_tcp_conn *tcp_conn = 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);
-}
-
-static void
-iscsi_conn_set_callbacks(struct iscsi_conn *conn)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct sock *sk = tcp_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;
- write_unlock_bh(&sk->sk_callback_lock);
-}
-
-static void
-iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
-{
- struct sock *sk = tcp_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_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 iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct socket *sk = tcp_conn->sock;
- int offset = buf->sg.offset + buf->sent, res;
-
- /*
- * 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)
- res = sock_no_sendpage(sk, buf->sg.page, offset, size, flags);
- else
- res = tcp_conn->sendpage(sk, buf->sg.page, offset, size, flags);
-
- if (res >= 0) {
- conn->txdata_octets += res;
- buf->sent += res;
- return res;
- }
-
- tcp_conn->sendpage_failures_cnt++;
- if (res == -EAGAIN)
- res = -ENOBUFS;
- else
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- return res;
-}
-
-/**
- * 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) {
- if (size != res)
- return -EAGAIN;
- return 0;
- }
-
- 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) {
- *count -= res;
- *sent += res;
- if (size != res)
- return -EAGAIN;
- return 0;
- }
+ read_lock(&sk->sk_callback_lock);
- return res;
-}
+ conn = (struct iscsi_conn*)sk->sk_user_data;
+ session = conn->session;
-static inline void
-iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_tcp_cmd_task *tcp_ctask)
-{
- crypto_hash_init(&tcp_conn->tx_hash);
- tcp_ctask->digest_count = 4;
+ iscsi_sw_sk_state_check(sk);
+
+ tcp_conn = conn->dd_data;
+ tcp_sw_conn = tcp_conn->dd_data;
+ old_state_change = tcp_sw_conn->old_state_change;
+
+ read_unlock(&sk->sk_callback_lock);
+
+ old_state_change(sk);
}
/**
- * 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.
+ * iscsi_write_space - Called when more output buffer space is available
+ * @sk: socket space is available for
**/
-static void
-iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct iscsi_r2t_info *r2t, int left)
+static void iscsi_sw_tcp_write_space(struct sock *sk)
{
- struct iscsi_data *hdr;
- int new_offset;
-
- 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, 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_iov(&r2t->headbuf, (char*)hdr,
- sizeof(struct iscsi_hdr));
-
- if (iscsi_buf_left(&r2t->sendbuf))
- return;
+ 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;
- iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
- r2t->sg += 1;
+ tcp_sw_conn->old_write_space(sk);
+ ISCSI_SW_TCP_DBG(conn, "iscsi_write_space\n");
+ iscsi_conn_queue_work(conn);
}
-static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask,
- unsigned long len)
+static void iscsi_sw_tcp_conn_set_callbacks(struct iscsi_conn *conn)
{
- tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1);
- if (!tcp_ctask->pad_count)
- return;
+ 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;
- tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count;
- debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count);
- tcp_ctask->xmstate |= XMSTATE_W_PAD;
+ /* assign new callbacks */
+ write_lock_bh(&sk->sk_callback_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);
}
-/**
- * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
- * @conn: iscsi connection
- * @ctask: scsi command task
- * @sc: scsi command
- **/
static void
-iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
+iscsi_sw_tcp_conn_restore_callbacks(struct iscsi_conn *conn)
{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->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 = tcp_sw_conn->sock->sk;
- BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
- tcp_ctask->xmstate = XMSTATE_CMD_HDR_INIT;
+ /* 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_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_tcp_mtask_xmit - xmit management(immediate) task
- * @conn: iscsi connection
- * @mtask: task management task
+ * iscsi_sw_tcp_xmit_segment - transmit segment
+ * @tcp_conn: the iSCSI TCP connection
+ * @segment: the buffer to transmnit
*
- * Notes:
- * The function can return -EAGAIN in which case caller must
- * call it again later, or recover. '0' return code means successful
- * xmit.
+ * This function transmits as much of the buffer as
+ * the network layer will accept, and returns the number of
+ * bytes transmitted.
*
- * Management xmit state machine consists of these states:
- * XMSTATE_IMM_HDR_INIT - calculate digest of PDU Header
- * XMSTATE_IMM_HDR - PDU Header xmit in progress
- * XMSTATE_IMM_DATA - PDU Data xmit in progress
- * XMSTATE_IDLE - management PDU is done
- **/
-static int
-iscsi_tcp_mtask_xmit(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
-{
- struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
- int rc;
-
- debug_scsi("mtask deq [cid %d state %x itt 0x%x]\n",
- conn->id, tcp_mtask->xmstate, mtask->itt);
-
- if (tcp_mtask->xmstate & XMSTATE_IMM_HDR_INIT) {
- iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
- sizeof(struct iscsi_hdr));
-
- if (mtask->data_count) {
- tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
- iscsi_buf_init_iov(&tcp_mtask->sendbuf,
- (char*)mtask->data,
- mtask->data_count);
+ * 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 (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
- conn->stop_stage != STOP_CONN_RECOVER &&
- conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &tcp_mtask->headbuf,
- (u8*)tcp_mtask->hdrext);
-
- tcp_mtask->sent = 0;
- tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR_INIT;
- tcp_mtask->xmstate |= XMSTATE_IMM_HDR;
- }
-
- if (tcp_mtask->xmstate & XMSTATE_IMM_HDR) {
- rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
- mtask->data_count);
- if (rc)
- return rc;
- tcp_mtask->xmstate &= ~XMSTATE_IMM_HDR;
- }
-
- if (tcp_mtask->xmstate & XMSTATE_IMM_DATA) {
- BUG_ON(!mtask->data_count);
- tcp_mtask->xmstate &= ~XMSTATE_IMM_DATA;
- /* FIXME: implement.
- * Virtual buffer could be spreaded across multiple pages...
- */
- do {
- int rc;
-
- rc = iscsi_sendpage(conn, &tcp_mtask->sendbuf,
- &mtask->data_count, &tcp_mtask->sent);
- if (rc) {
- tcp_mtask->xmstate |= XMSTATE_IMM_DATA;
- return rc;
- }
- } while (mtask->data_count);
- }
-
- BUG_ON(tcp_mtask->xmstate != XMSTATE_IDLE);
- if (mtask->hdr->itt == RESERVED_ITT) {
- struct iscsi_session *session = conn->session;
-
- spin_lock_bh(&session->lock);
- list_del(&conn->mtask->running);
- __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask,
- sizeof(void*));
- spin_unlock_bh(&session->lock);
+ if (r < 0) {
+ iscsi_tcp_segment_unmap(segment);
+ return r;
+ }
+ copied += r;
}
- return 0;
+ return copied;
}
-static int
-iscsi_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+/**
+ * iscsi_sw_tcp_xmit - TCP transmit
+ **/
+static int iscsi_sw_tcp_xmit(struct iscsi_conn *conn)
{
- struct scsi_cmnd *sc = ctask->sc;
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ 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;
- if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_INIT) {
- tcp_ctask->sent = 0;
- tcp_ctask->sg_count = 0;
- tcp_ctask->exp_datasn = 0;
-
- if (sc->sc_data_direction == DMA_TO_DEVICE) {
- struct scatterlist *sg = scsi_sglist(sc);
+ while (1) {
+ 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;
+ } else if (rc == 0)
+ break;
- iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
- tcp_ctask->sg = sg + 1;
- tcp_ctask->bad_sg = sg + scsi_sg_count(sc);
+ consumed += rc;
- debug_scsi("cmd [itt 0x%x total %d imm_data %d "
- "unsol count %d, unsol offset %d]\n",
- ctask->itt, scsi_bufflen(sc),
- ctask->imm_count, ctask->unsol_count,
- ctask->unsol_offset);
+ if (segment->total_copied >= segment->total_size) {
+ if (segment->done != NULL) {
+ rc = segment->done(tcp_conn, segment);
+ if (rc != 0)
+ goto error;
+ }
}
-
- iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
- sizeof(struct iscsi_hdr));
-
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
- (u8*)tcp_ctask->hdrext);
- tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_INIT;
- tcp_ctask->xmstate |= XMSTATE_CMD_HDR_XMIT;
}
- if (tcp_ctask->xmstate & XMSTATE_CMD_HDR_XMIT) {
- rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
- if (rc)
- return rc;
- tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_XMIT;
-
- if (sc->sc_data_direction != DMA_TO_DEVICE)
- return 0;
+ ISCSI_SW_TCP_DBG(conn, "xmit %d bytes\n", consumed);
- if (ctask->imm_count) {
- tcp_ctask->xmstate |= XMSTATE_IMM_DATA;
- iscsi_set_padding(tcp_ctask, ctask->imm_count);
-
- if (ctask->conn->datadgst_en) {
- iscsi_data_digest_init(ctask->conn->dd_data,
- tcp_ctask);
- tcp_ctask->immdigest = 0;
- }
- }
+ conn->txdata_octets += consumed;
+ return consumed;
- if (ctask->unsol_count)
- tcp_ctask->xmstate |=
- XMSTATE_UNS_HDR | XMSTATE_UNS_INIT;
- }
- return rc;
+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;
}
-static int
-iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+/**
+ * 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_cmd_task *tcp_ctask = ctask->dd_data;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int sent = 0, rc;
-
- if (tcp_ctask->xmstate & XMSTATE_W_PAD) {
- iscsi_buf_init_iov(&tcp_ctask->sendbuf, (char*)&tcp_ctask->pad,
- tcp_ctask->pad_count);
- if (conn->datadgst_en)
- crypto_hash_update(&tcp_conn->tx_hash,
- &tcp_ctask->sendbuf.sg,
- tcp_ctask->sendbuf.sg.length);
- } else if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_PAD))
- return 0;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
+ struct iscsi_segment *segment = &tcp_sw_conn->out.segment;
- tcp_ctask->xmstate &= ~XMSTATE_W_PAD;
- tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_PAD;
- debug_scsi("sending %d pad bytes for itt 0x%x\n",
- tcp_ctask->pad_count, ctask->itt);
- rc = iscsi_sendpage(conn, &tcp_ctask->sendbuf, &tcp_ctask->pad_count,
- &sent);
- if (rc) {
- debug_scsi("padding send failed %d\n", rc);
- tcp_ctask->xmstate |= XMSTATE_W_RESEND_PAD;
- }
- return rc;
+ return segment->total_copied - segment->total_size;
}
-static int
-iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct iscsi_buf *buf, uint32_t *digest)
+static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task)
{
- struct iscsi_tcp_cmd_task *tcp_ctask;
- struct iscsi_tcp_conn *tcp_conn;
- int rc, sent = 0;
-
- if (!conn->datadgst_en)
- return 0;
-
- tcp_ctask = ctask->dd_data;
- tcp_conn = conn->dd_data;
+ struct iscsi_conn *conn = task->conn;
+ int rc;
- if (!(tcp_ctask->xmstate & XMSTATE_W_RESEND_DATA_DIGEST)) {
- crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest);
- iscsi_buf_init_iov(buf, (char*)digest, 4);
+ while (iscsi_sw_tcp_xmit_qlen(conn)) {
+ rc = iscsi_sw_tcp_xmit(conn);
+ if (rc == 0)
+ return -EAGAIN;
+ if (rc < 0)
+ return rc;
}
- tcp_ctask->xmstate &= ~XMSTATE_W_RESEND_DATA_DIGEST;
- rc = iscsi_sendpage(conn, buf, &tcp_ctask->digest_count, &sent);
- if (!rc)
- debug_scsi("sent digest 0x%x for itt 0x%x\n", *digest,
- ctask->itt);
- else {
- debug_scsi("sending digest 0x%x failed for itt 0x%x!\n",
- *digest, ctask->itt);
- tcp_ctask->xmstate |= XMSTATE_W_RESEND_DATA_DIGEST;
- }
- return rc;
+ return 0;
}
-static int
-iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf,
- struct scatterlist **sg, int *sent, int *count,
- struct iscsi_buf *digestbuf, uint32_t *digest)
+/*
+ * 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_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_conn *conn = ctask->conn;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int rc, buf_sent, offset;
-
- while (*count) {
- buf_sent = 0;
- offset = sendbuf->sent;
-
- rc = iscsi_sendpage(conn, sendbuf, count, &buf_sent);
- *sent = *sent + buf_sent;
- if (buf_sent && conn->datadgst_en)
- partial_sg_digest_update(&tcp_conn->tx_hash,
- &sendbuf->sg, sendbuf->sg.offset + offset,
- buf_sent);
- if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) {
- iscsi_buf_init_sg(sendbuf, *sg);
- *sg = *sg + 1;
- }
-
- if (rc)
- return rc;
- }
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- rc = iscsi_send_padding(conn, ctask);
- if (rc)
- return rc;
-
- return iscsi_send_digest(conn, ctask, digestbuf, digest);
+ 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_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+static void iscsi_sw_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr,
+ size_t hdrlen)
{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_data_task *dtask;
- int rc;
-
- tcp_ctask->xmstate |= XMSTATE_UNS_DATA;
- if (tcp_ctask->xmstate & XMSTATE_UNS_INIT) {
- dtask = &tcp_ctask->unsol_dtask;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_sw_tcp_conn *tcp_sw_conn = tcp_conn->dd_data;
- iscsi_prep_unsolicit_data_pdu(ctask, &dtask->hdr);
- iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)&dtask->hdr,
- sizeof(struct iscsi_hdr));
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
- (u8*)dtask->hdrext);
+ ISCSI_SW_TCP_DBG(conn, "%s\n", conn->hdrdgst_en ?
+ "digest enabled" : "digest disabled");
- tcp_ctask->xmstate &= ~XMSTATE_UNS_INIT;
- iscsi_set_padding(tcp_ctask, ctask->data_count);
- }
+ /* 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));
- rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
- if (rc) {
- tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
- tcp_ctask->xmstate |= XMSTATE_UNS_HDR;
- return rc;
+ /* 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;
}
- if (conn->datadgst_en) {
- dtask = &tcp_ctask->unsol_dtask;
- iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
- dtask->digest = 0;
- }
+ /* 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;
- debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
- ctask->itt, ctask->unsol_count, tcp_ctask->sent);
- return 0;
+ 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_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+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_cmd_task *tcp_ctask = ctask->dd_data;
- int rc;
+ 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;
- if (tcp_ctask->xmstate & XMSTATE_UNS_HDR) {
- BUG_ON(!ctask->unsol_count);
- tcp_ctask->xmstate &= ~XMSTATE_UNS_HDR;
-send_hdr:
- rc = iscsi_send_unsol_hdr(conn, ctask);
- if (rc)
- return rc;
- }
+ ISCSI_SW_TCP_DBG(conn, "offset=%d, datalen=%d %s\n", offset, len,
+ conn->datadgst_en ?
+ "digest enabled" : "digest disabled");
- if (tcp_ctask->xmstate & XMSTATE_UNS_DATA) {
- struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask;
- int start = tcp_ctask->sent;
+ /* 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));
- rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
- &tcp_ctask->sent, &ctask->data_count,
- &dtask->digestbuf, &dtask->digest);
- ctask->unsol_count -= tcp_ctask->sent - start;
- if (rc)
- return rc;
- tcp_ctask->xmstate &= ~XMSTATE_UNS_DATA;
- /*
- * Done with the Data-Out. Next, check if we need
- * to send another unsolicited Data-Out.
- */
- if (ctask->unsol_count) {
- debug_scsi("sending more uns\n");
- tcp_ctask->xmstate |= XMSTATE_UNS_INIT;
- goto send_hdr;
- }
- }
- return 0;
+ if (conn->datadgst_en)
+ tx_hash = &tcp_sw_conn->tx_hash;
+
+ return iscsi_segment_seek_sg(&tcp_sw_conn->out.data_segment,
+ sg, count, offset, len,
+ NULL, tx_hash);
}
-static int iscsi_send_sol_pdu(struct iscsi_conn *conn,
- struct iscsi_cmd_task *ctask)
+static void
+iscsi_sw_tcp_send_linear_data_prep(struct iscsi_conn *conn, void *data,
+ size_t len)
{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_session *session = conn->session;
- struct iscsi_r2t_info *r2t;
- struct iscsi_data_task *dtask;
- int left, rc;
-
- if (tcp_ctask->xmstate & XMSTATE_SOL_HDR_INIT) {
- if (!tcp_ctask->r2t) {
- spin_lock_bh(&session->lock);
- __kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
- sizeof(void*));
- spin_unlock_bh(&session->lock);
- }
-send_hdr:
- r2t = tcp_ctask->r2t;
- dtask = &r2t->dtask;
-
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &r2t->headbuf,
- (u8*)dtask->hdrext);
- tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR_INIT;
- tcp_ctask->xmstate |= XMSTATE_SOL_HDR;
- }
-
- if (tcp_ctask->xmstate & XMSTATE_SOL_HDR) {
- r2t = tcp_ctask->r2t;
- dtask = &r2t->dtask;
-
- rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
- if (rc)
- return rc;
- tcp_ctask->xmstate &= ~XMSTATE_SOL_HDR;
- tcp_ctask->xmstate |= XMSTATE_SOL_DATA;
-
- if (conn->datadgst_en) {
- iscsi_data_digest_init(conn->dd_data, tcp_ctask);
- dtask->digest = 0;
- }
-
- iscsi_set_padding(tcp_ctask, r2t->data_count);
- 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);
- }
+ 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;
- if (tcp_ctask->xmstate & XMSTATE_SOL_DATA) {
- r2t = tcp_ctask->r2t;
- dtask = &r2t->dtask;
+ ISCSI_SW_TCP_DBG(conn, "datalen=%zd %s\n", len, conn->datadgst_en ?
+ "digest enabled" : "digest disabled");
- rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg,
- &r2t->sent, &r2t->data_count,
- &dtask->digestbuf, &dtask->digest);
- if (rc)
- return rc;
- tcp_ctask->xmstate &= ~XMSTATE_SOL_DATA;
+ /* 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));
- /*
- * 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) {
- iscsi_solicit_data_cont(conn, ctask, r2t, left);
- goto send_hdr;
- }
+ if (conn->datadgst_en)
+ tx_hash = &tcp_sw_conn->tx_hash;
- /*
- * Done with this R2T. Check if there are more
- * outstanding R2Ts ready to be processed.
- */
- spin_lock_bh(&session->lock);
- tcp_ctask->r2t = NULL;
- __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
- sizeof(void*));
- if (__kfifo_get(tcp_ctask->r2tqueue, (void*)&r2t,
- sizeof(void*))) {
- tcp_ctask->r2t = r2t;
- spin_unlock_bh(&session->lock);
- goto send_hdr;
- }
- spin_unlock_bh(&session->lock);
- }
- return 0;
+ iscsi_segment_init_linear(&tcp_sw_conn->out.data_segment,
+ data, len, NULL, tx_hash);
}
-/**
- * iscsi_tcp_ctask_xmit - xmit normal PDU task
- * @conn: iscsi connection
- * @ctask: iscsi command task
- *
- * Notes:
- * The function can return -EAGAIN in which case caller must
- * call it again later, or recover. '0' return code means successful
- * xmit.
- * The function is devided to logical helpers (above) for the different
- * xmit stages.
- *
- *iscsi_send_cmd_hdr()
- * XMSTATE_CMD_HDR_INIT - prepare Header and Data buffers Calculate
- * Header Digest
- * XMSTATE_CMD_HDR_XMIT - Transmit header in progress
- *
- *iscsi_send_padding
- * XMSTATE_W_PAD - Prepare and send pading
- * XMSTATE_W_RESEND_PAD - retry send pading
- *
- *iscsi_send_digest
- * XMSTATE_W_RESEND_DATA_DIGEST - Finalize and send Data Digest
- * XMSTATE_W_RESEND_DATA_DIGEST - retry sending digest
- *
- *iscsi_send_unsol_hdr
- * XMSTATE_UNS_INIT - prepare un-solicit data header and digest
- * XMSTATE_UNS_HDR - send un-solicit header
- *
- *iscsi_send_unsol_pdu
- * XMSTATE_UNS_DATA - send un-solicit data in progress
- *
- *iscsi_send_sol_pdu
- * XMSTATE_SOL_HDR_INIT - solicit data header and digest initialize
- * XMSTATE_SOL_HDR - send solicit header
- * XMSTATE_SOL_DATA - send solicit data
- *
- *iscsi_tcp_ctask_xmit
- * XMSTATE_IMM_DATA - xmit managment data (??)
- **/
-static int
-iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+static int iscsi_sw_tcp_pdu_init(struct iscsi_task *task,
+ unsigned int offset, unsigned int count)
{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- int rc = 0;
+ struct iscsi_conn *conn = task->conn;
+ int err = 0;
- debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
- conn->id, tcp_ctask->xmstate, ctask->itt);
+ iscsi_sw_tcp_send_hdr_prep(conn, task->hdr, task->hdr_len);
- rc = iscsi_send_cmd_hdr(conn, ctask);
- if (rc)
- return rc;
- if (ctask->sc->sc_data_direction != DMA_TO_DEVICE)
+ if (!count)
return 0;
- if (tcp_ctask->xmstate & XMSTATE_IMM_DATA) {
- rc = iscsi_send_data(ctask, &tcp_ctask->sendbuf, &tcp_ctask->sg,
- &tcp_ctask->sent, &ctask->imm_count,
- &tcp_ctask->immbuf, &tcp_ctask->immdigest);
- if (rc)
- return rc;
- tcp_ctask->xmstate &= ~XMSTATE_IMM_DATA;
+ if (!task->sc)
+ iscsi_sw_tcp_send_linear_data_prep(conn, task->data, count);
+ else {
+ struct scsi_data_buffer *sdb = scsi_out(task->sc);
+
+ err = iscsi_sw_tcp_send_data_prep(conn, sdb->table.sgl,
+ sdb->table.nents, offset,
+ count);
}
- rc = iscsi_send_unsol_pdu(conn, ctask);
- if (rc)
- return rc;
+ if (err) {
+ /* got invalid offset/len */
+ return -EIO;
+ }
+ return 0;
+}
- rc = iscsi_send_sol_pdu(conn, ctask);
- if (rc)
- return rc;
+static int iscsi_sw_tcp_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
+{
+ struct iscsi_tcp_task *tcp_task = task->dd_data;
- return rc;
+ task->hdr = task->dd_data + sizeof(*tcp_task);
+ task->hdr_max = sizeof(struct iscsi_sw_tcp_hdrbuf) - ISCSI_DIGEST_SIZE;
+ return 0;
}
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, 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 = kzalloc(sizeof(*tcp_conn), GFP_KERNEL);
- if (!tcp_conn)
- goto tcp_conn_alloc_fail;
-
- conn->dd_data = tcp_conn;
- tcp_conn->iscsi_conn = conn;
-
- 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)) {
- printk(KERN_ERR "Could not create connection due to crc32c "
- "loading error %ld. Make sure the crc32c module is "
- "built as a module or into the kernel\n",
- PTR_ERR(tcp_conn->tx_hash.tfm));
- goto free_tcp_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)) {
- printk(KERN_ERR "Could not create connection due to crc32c "
- "loading error %ld. Make sure the crc32c module is "
- "built as a module or into the kernel\n",
- PTR_ERR(tcp_conn->rx_hash.tfm));
+ 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;
return cls_conn;
free_tx_tfm:
- crypto_free_hash(tcp_conn->tx_hash.tfm);
-free_tcp_conn:
- kfree(tcp_conn);
-tcp_conn_alloc_fail:
- iscsi_conn_teardown(cls_conn);
+ 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;
}
-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;
- conn->recv_lock = 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_conn_teardown(cls_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);
- kfree(tcp_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 (!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));
+ }
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;
case AF_INET:
sin = (struct sockaddr_in *)addr;
spin_lock_bh(&conn->session->lock);
- sprintf(buf, NIPQUAD_FMT, NIPQUAD(sin->sin_addr.s_addr));
+ sprintf(buf, "%pI4", &sin->sin_addr.s_addr);
*port = be16_to_cpu(sin->sin_port);
spin_unlock_bh(&conn->session->lock);
break;
case AF_INET6:
sin6 = (struct sockaddr_in6 *)addr;
spin_lock_bh(&conn->session->lock);
- sprintf(buf, NIP6_FMT, NIP6(sin6->sin6_addr));
+ sprintf(buf, "%pI6", &sin6->sin6_addr);
*port = be16_to_cpu(sin6->sin6_port);
spin_unlock_bh(&conn->session->lock);
break;
}
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;
/* lookup for existing socket */
sock = sockfd_lookup((int)transport_eph, &err);
if (!sock) {
- printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
+ iscsi_conn_printk(KERN_ERR, conn,
+ "sockfd_lookup failed %d\n", err);
return -EEXIST;
}
/*
* 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, conn->local_address,
- &conn->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;
- /* FIXME: disable Nagle's algorithm */
-
- /*
- * Intercept TCP callbacks for sendfile like receive
- * processing.
- */
- conn->recv_lock = &sk->sk_callback_lock;
- 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;
}
-/* called with host lock */
-static void
-iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
-{
- struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
- tcp_mtask->xmstate = XMSTATE_IMM_HDR_INIT;
-}
-
-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_cmd_task *ctask = session->cmds[cmd_i];
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->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_ctask->r2tpool, session->max_r2t * 4,
- (void***)&tcp_ctask->r2ts,
- sizeof(struct iscsi_r2t_info))) {
- goto r2t_alloc_fail;
- }
-
- /* R2T xmit queue */
- tcp_ctask->r2tqueue = kfifo_alloc(
- session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
- if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
- iscsi_pool_free(&tcp_ctask->r2tpool,
- (void**)tcp_ctask->r2ts);
- goto r2t_alloc_fail;
- }
- }
-
- return 0;
-
-r2t_alloc_fail:
- for (i = 0; i < cmd_i; i++) {
- struct iscsi_cmd_task *ctask = session->cmds[i];
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
-
- kfifo_free(tcp_ctask->r2tqueue);
- iscsi_pool_free(&tcp_ctask->r2tpool,
- (void**)tcp_ctask->r2ts);
- }
- return -ENOMEM;
-}
-
-static void
-iscsi_r2tpool_free(struct iscsi_session *session)
-{
- int i;
-
- for (i = 0; i < session->cmds_max; i++) {
- struct iscsi_cmd_task *ctask = session->cmds[i];
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
-
- kfifo_free(tcp_ctask->r2tqueue);
- iscsi_pool_free(&tcp_ctask->r2tpool,
- (void**)tcp_ctask->r2ts);
- }
-}
-
-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);
- if (session->max_r2t == roundup_pow_of_two(value))
+ if (value <= 0 || !is_power_of_2(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 (session->max_r2t & (session->max_r2t - 1))
- session->max_r2t = roundup_pow_of_two(session->max_r2t);
- 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;
return len;
}
-static int
-iscsi_tcp_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
- char *buf)
-{
- struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
- int len;
-
- switch (param) {
- case ISCSI_HOST_PARAM_IPADDRESS:
- spin_lock_bh(&session->lock);
- if (!session->leadconn)
- len = -ENODEV;
- else
- len = sprintf(buf, "%s\n",
- session->leadconn->local_address);
- spin_unlock_bh(&session->lock);
- break;
- default:
- return iscsi_host_get_param(shost, param, buf);
- }
- return 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_transport *iscsit,
- struct scsi_transport_template *scsit,
- 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;
- uint32_t hn;
- int cmd_i;
+ struct Scsi_Host *shost;
- cls_session = iscsi_session_setup(iscsit, scsit, cmds_max, qdepth,
- sizeof(struct iscsi_tcp_cmd_task),
- sizeof(struct iscsi_tcp_mgmt_task),
- initial_cmdsn, &hn);
- if (!cls_session)
+ if (ep) {
+ printk(KERN_ERR "iscsi_tcp: invalid ep %p.\n", ep);
return NULL;
- *hostno = hn;
-
- session = class_to_transport_session(cls_session);
- for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
- struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
-
- ctask->hdr = &tcp_ctask->hdr;
- }
-
- for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
- struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
- struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
-
- mtask->hdr = &tcp_mtask->hdr;
}
- if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
- goto r2tpool_alloc_fail;
+ 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;
-r2tpool_alloc_fail:
+remove_session:
iscsi_session_teardown(cls_session);
+remove_host:
+ iscsi_host_remove(shost);
+free_host:
+ iscsi_host_free(shost);
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)
{
- iscsi_r2tpool_free(class_to_transport_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_tcp_slave_configure(struct scsi_device *sdev)
+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,
.change_queue_depth = iscsi_change_queue_depth,
.can_queue = ISCSI_DEF_XMIT_CMDS_MAX - 1,
- .sg_tablesize = ISCSI_SG_TABLESIZE,
+ .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_host_reset_handler = iscsi_eh_host_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_TARGET_NAME | ISCSI_TPGT |
ISCSI_USERNAME | ISCSI_PASSWORD |
ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
- ISCSI_FAST_ABORT,
+ 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,
- .host_template = &iscsi_sht,
- .conndata_size = sizeof(struct iscsi_conn),
- .max_conn = 1,
- .max_cmd_len = ISCSI_TCP_MAX_CMD_LEN,
/* 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_tcp_host_get_param,
+ .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,
- .init_cmd_task = iscsi_tcp_cmd_init,
- .init_mgmt_task = iscsi_tcp_mgmt_init,
- .xmit_cmd_task = iscsi_tcp_ctask_xmit,
- .xmit_mgmt_task = iscsi_tcp_mtask_xmit,
- .cleanup_cmd_task = iscsi_tcp_cleanup_ctask,
+ .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",
iscsi_max_lun);
return -EINVAL;
}
- iscsi_tcp_transport.max_lun = iscsi_max_lun;
- if (!iscsi_register_transport(&iscsi_tcp_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