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Diffstat (limited to 'drivers/scsi/iscsi_tcp.c')
-rw-r--r--drivers/scsi/iscsi_tcp.c2075
1 files changed, 892 insertions, 1183 deletions
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 57ce2251abc8..e5be5fd4ef58 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -48,7 +48,7 @@ MODULE_AUTHOR("Dmitry Yusupov <dmitry_yus@yahoo.com>, "
"Alex Aizman <itn780@yahoo.com>");
MODULE_DESCRIPTION("iSCSI/TCP data-path");
MODULE_LICENSE("GPL");
-/* #define DEBUG_TCP */
+#undef DEBUG_TCP
#define DEBUG_ASSERT
#ifdef DEBUG_TCP
@@ -67,115 +67,429 @@ MODULE_LICENSE("GPL");
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_buf_init_iov(struct iscsi_buf *ibuf, char *vbuf, int size)
+iscsi_tcp_segment_init_sg(struct iscsi_segment *segment,
+ struct scatterlist *sg, unsigned int offset)
{
- sg_init_one(&ibuf->sg, vbuf, size);
- ibuf->sent = 0;
- ibuf->use_sendmsg = 1;
+ 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_buf_init_sg(struct iscsi_buf *ibuf, struct scatterlist *sg)
+iscsi_tcp_segment_map(struct iscsi_segment *segment, int recv)
{
- sg_init_table(&ibuf->sg, 1);
- sg_set_page(&ibuf->sg, sg_page(sg), sg->length, sg->offset);
+ struct scatterlist *sg;
+
+ if (segment->data != NULL || !segment->sg)
+ return;
+
+ sg = segment->sg;
+ BUG_ON(segment->sg_mapped);
+ BUG_ON(sg->length == 0);
+
/*
- * Fastpath: sg element fits into single page
+ * 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 (sg->length + sg->offset <= PAGE_SIZE && !PageSlab(sg_page(sg)))
- ibuf->use_sendmsg = 0;
- else
- ibuf->use_sendmsg = 1;
- ibuf->sent = 0;
+ 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 int
-iscsi_buf_left(struct iscsi_buf *ibuf)
+static inline void
+iscsi_tcp_segment_unmap(struct iscsi_segment *segment)
{
- int rc;
+ debug_tcp("iscsi_tcp_segment_unmap %p\n", segment);
- rc = ibuf->sg.length - ibuf->sent;
- BUG_ON(rc < 0);
- return rc;
+ 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_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
- u8* crc)
+iscsi_tcp_segment_splice_digest(struct iscsi_segment *segment, void *digest)
{
- 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);
+ 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_hdr_extract(struct iscsi_tcp_conn *tcp_conn)
+iscsi_tcp_segment_done(struct iscsi_segment *segment, int recv, unsigned copied)
{
- struct sk_buff *skb = tcp_conn->in.skb;
-
- tcp_conn->in.zero_copy_hdr = 0;
+ static unsigned char padbuf[ISCSI_PAD_LEN];
+ struct scatterlist sg;
+ unsigned int pad;
- if (tcp_conn->in.copy >= tcp_conn->hdr_size &&
- tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER) {
+ debug_tcp("copied %u %u size %u %s\n", segment->copied, copied,
+ segment->size, recv ? "recv" : "xmit");
+ if (segment->hash && copied) {
/*
- * Zero-copy PDU Header: using connection context
- * to store header pointer.
+ * If a segment is kmapd we must unmap it before sending
+ * to the crypto layer since that will try to kmap it again.
*/
- if (skb_shinfo(skb)->frag_list == NULL &&
- !skb_shinfo(skb)->nr_frags) {
- tcp_conn->in.hdr = (struct iscsi_hdr *)
- ((char*)skb->data + tcp_conn->in.offset);
- tcp_conn->in.zero_copy_hdr = 1;
+ 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 {
- /* ignoring return code since we checked
- * in.copy before */
- skb_copy_bits(skb, tcp_conn->in.offset,
- &tcp_conn->hdr, tcp_conn->hdr_size);
- tcp_conn->in.hdr = &tcp_conn->hdr;
+ 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);
}
- tcp_conn->in.offset += tcp_conn->hdr_size;
- tcp_conn->in.copy -= tcp_conn->hdr_size;
- } else {
- int hdr_remains;
- int copylen;
- /*
- * PDU header scattered across SKB's,
- * copying it... This'll happen quite rarely.
- */
+ 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;
+}
- if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER)
- tcp_conn->in.hdr_offset = 0;
+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;
- hdr_remains = tcp_conn->hdr_size - tcp_conn->in.hdr_offset;
- BUG_ON(hdr_remains <= 0);
+ sg_init_one(&sg, hdr, hdrlen);
+ crypto_hash_digest(hash, &sg, hdrlen, digest);
+}
- copylen = min(tcp_conn->in.copy, hdr_remains);
- skb_copy_bits(skb, tcp_conn->in.offset,
- (char*)&tcp_conn->hdr + tcp_conn->in.hdr_offset,
- copylen);
+static inline int
+iscsi_tcp_dgst_verify(struct iscsi_tcp_conn *tcp_conn,
+ struct iscsi_segment *segment)
+{
+ if (!segment->digest_len)
+ return 1;
- debug_tcp("PDU gather offset %d bytes %d in.offset %d "
- "in.copy %d\n", tcp_conn->in.hdr_offset, copylen,
- tcp_conn->in.offset, tcp_conn->in.copy);
+ if (memcmp(segment->recv_digest, segment->digest,
+ segment->digest_len)) {
+ debug_scsi("digest mismatch\n");
+ return 0;
+ }
- tcp_conn->in.offset += copylen;
- tcp_conn->in.copy -= copylen;
- if (copylen < hdr_remains) {
- tcp_conn->in_progress = IN_PROGRESS_HEADER_GATHER;
- tcp_conn->in.hdr_offset += copylen;
- return -EAGAIN;
+ 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;
}
- tcp_conn->in.hdr = &tcp_conn->hdr;
- tcp_conn->discontiguous_hdr_cnt++;
- tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
+ 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)
+ 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
*/
@@ -184,7 +498,6 @@ 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*))) {
@@ -193,12 +506,12 @@ iscsi_tcp_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
debug_scsi("iscsi_tcp_cleanup_ctask pending r2t dropped\n");
}
- sc = ctask->sc;
- if (unlikely(!sc))
- return;
-
- tcp_ctask->xmstate = XMSTATE_VALUE_IDLE;
- tcp_ctask->r2t = NULL;
+ r2t = tcp_ctask->r2t;
+ if (r2t != NULL) {
+ __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
+ sizeof(void*));
+ tcp_ctask->r2t = NULL;
+ }
}
/**
@@ -217,11 +530,6 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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;
@@ -242,22 +550,20 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
}
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) {
+ if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW |
+ ISCSI_FLAG_DATA_OVERFLOW)) {
int res_count = be32_to_cpu(rhdr->residual_count);
if (res_count > 0 &&
- res_count <= scsi_bufflen(sc)) {
+ (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
+ res_count <= scsi_bufflen(sc)))
scsi_set_resid(sc, res_count);
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
- } else
+ else
sc->result = (DID_BAD_TARGET << 16) |
rhdr->cmd_status;
- } else if (rhdr->flags & ISCSI_FLAG_DATA_OVERFLOW) {
- scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count));
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
- } else
- sc->result = (DID_OK << 16) | rhdr->cmd_status;
+ }
}
conn->datain_pdus_cnt++;
@@ -281,9 +587,6 @@ 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));
@@ -307,34 +610,6 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
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);
}
/**
@@ -366,14 +641,11 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
}
/* fill-in new R2T associated with the task */
- spin_lock(&session->lock);
iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
- if (!ctask->sc || ctask->mtask ||
- session->state != ISCSI_STATE_LOGGED_IN) {
+ 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;
}
@@ -384,7 +656,8 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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);
+ __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
+ sizeof(void*));
return ISCSI_ERR_DATALEN;
}
@@ -395,10 +668,11 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
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));
+ __kfifo_put(tcp_ctask->r2tpool.queue, (void*)&r2t,
+ sizeof(void*));
return ISCSI_ERR_DATALEN;
}
@@ -409,26 +683,55 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
tcp_ctask->exp_datasn = r2tsn + 1;
__kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*));
- set_bit(XMSTATE_BIT_SOL_HDR_INIT, &tcp_ctask->xmstate);
- list_move_tail(&ctask->running, &conn->xmitqueue);
-
- scsi_queue_work(session->host, &conn->xmitwork);
conn->r2t_pdus_cnt++;
- spin_unlock(&session->lock);
+ iscsi_requeue_ctask(ctask);
return 0;
}
+/*
+ * Handle incoming reply to DataIn command
+ */
static int
-iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
+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_hdr *hdr;
struct iscsi_session *session = conn->session;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- uint32_t cdgst, rdgst = 0, itt;
-
- hdr = tcp_conn->in.hdr;
+ struct iscsi_cmd_task *ctask;
+ uint32_t itt;
/* verify PDU length */
tcp_conn->in.datalen = ntoh24(hdr->dlength);
@@ -437,78 +740,73 @@ iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
tcp_conn->in.datalen, conn->max_recv_dlength);
return ISCSI_ERR_DATALEN;
}
- tcp_conn->data_copied = 0;
- /* read AHS */
+ /* Additional header segments. So far, we don't
+ * process additional headers.
+ */
ahslen = hdr->hlength << 2;
- tcp_conn->in.offset += ahslen;
- tcp_conn->in.copy -= ahslen;
- if (tcp_conn->in.copy < 0) {
- printk(KERN_ERR "iscsi_tcp: can't handle AHS with length "
- "%d bytes\n", ahslen);
- return ISCSI_ERR_AHSLEN;
- }
-
- /* calculate read padding */
- tcp_conn->in.padding = tcp_conn->in.datalen & (ISCSI_PAD_LEN-1);
- if (tcp_conn->in.padding) {
- tcp_conn->in.padding = ISCSI_PAD_LEN - tcp_conn->in.padding;
- debug_scsi("read padding %d bytes\n", tcp_conn->in.padding);
- }
-
- if (conn->hdrdgst_en) {
- struct scatterlist sg;
-
- sg_init_one(&sg, (u8 *)hdr,
- sizeof(struct iscsi_hdr) + ahslen);
- crypto_hash_digest(&tcp_conn->rx_hash, &sg, sg.length,
- (u8 *)&cdgst);
- rdgst = *(uint32_t*)((char*)hdr + sizeof(struct iscsi_hdr) +
- ahslen);
- if (cdgst != rdgst) {
- printk(KERN_ERR "iscsi_tcp: hdrdgst error "
- "recv 0x%x calc 0x%x\n", rdgst, cdgst);
- return ISCSI_ERR_HDR_DGST;
- }
- }
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) {
- tcp_conn->in.datalen = 0; /* force drop */
- return 0;
- } else if (rc)
+ if (rc)
return rc;
- debug_tcp("opcode 0x%x offset %d copy %d ahslen %d datalen %d\n",
- opcode, tcp_conn->in.offset, tcp_conn->in.copy,
- ahslen, tcp_conn->in.datalen);
+ debug_tcp("opcode 0x%x ahslen %d datalen %d\n",
+ opcode, ahslen, tcp_conn->in.datalen);
switch(opcode) {
case ISCSI_OP_SCSI_DATA_IN:
- tcp_conn->in.ctask = session->cmds[itt];
- rc = iscsi_data_rsp(conn, tcp_conn->in.ctask);
+ ctask = session->cmds[itt];
+ spin_lock(&conn->session->lock);
+ rc = iscsi_data_rsp(conn, ctask);
+ spin_unlock(&conn->session->lock);
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_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)
+ 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_segment_seek_sg(&tcp_conn->in.segment,
+ 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:
- tcp_conn->in.ctask = session->cmds[itt];
- if (tcp_conn->in.datalen)
- goto copy_hdr;
-
- spin_lock(&session->lock);
- rc = __iscsi_complete_pdu(conn, hdr, NULL, 0);
- spin_unlock(&session->lock);
+ 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:
- tcp_conn->in.ctask = session->cmds[itt];
+ ctask = session->cmds[itt];
if (ahslen)
rc = ISCSI_ERR_AHSLEN;
- else if (tcp_conn->in.ctask->sc->sc_data_direction ==
- DMA_TO_DEVICE)
- rc = iscsi_r2t_rsp(conn, tcp_conn->in.ctask);
- else
+ else if (ctask->sc->sc_data_direction == DMA_TO_DEVICE) {
+ spin_lock(&session->lock);
+ rc = iscsi_r2t_rsp(conn, ctask);
+ spin_unlock(&session->lock);
+ } else
rc = ISCSI_ERR_PROTO;
break;
case ISCSI_OP_LOGIN_RSP:
@@ -520,8 +818,7 @@ iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
* 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) {
+ 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,
@@ -530,8 +827,13 @@ iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
break;
}
- if (tcp_conn->in.datalen)
- goto copy_hdr;
+ /* 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:
@@ -543,461 +845,161 @@ iscsi_tcp_hdr_recv(struct iscsi_conn *conn)
break;
}
- return rc;
-
-copy_hdr:
- /*
- * if we did zero copy for the header but we will need multiple
- * skbs to complete the command then we have to copy the header
- * for later use
- */
- if (tcp_conn->in.zero_copy_hdr && tcp_conn->in.copy <=
- (tcp_conn->in.datalen + tcp_conn->in.padding +
- (conn->datadgst_en ? 4 : 0))) {
- debug_tcp("Copying header for later use. in.copy %d in.datalen"
- " %d\n", tcp_conn->in.copy, tcp_conn->in.datalen);
- memcpy(&tcp_conn->hdr, tcp_conn->in.hdr,
- sizeof(struct iscsi_hdr));
- tcp_conn->in.hdr = &tcp_conn->hdr;
- tcp_conn->in.zero_copy_hdr = 0;
- }
- return 0;
-}
-
-/**
- * iscsi_ctask_copy - copy skb bits to the destanation cmd task
- * @conn: iscsi tcp connection
- * @ctask: scsi command task
- * @buf: buffer to copy to
- * @buf_size: size of buffer
- * @offset: offset within the buffer
- *
- * Notes:
- * The function calls skb_copy_bits() and updates per-connection and
- * per-cmd byte counters.
- *
- * Read counters (in bytes):
- *
- * conn->in.offset offset within in progress SKB
- * conn->in.copy left to copy from in progress SKB
- * including padding
- * conn->in.copied copied already from in progress SKB
- * conn->data_copied copied already from in progress buffer
- * ctask->sent total bytes sent up to the MidLayer
- * ctask->data_count left to copy from in progress Data-In
- * buf_left left to copy from in progress buffer
- **/
-static inline int
-iscsi_ctask_copy(struct iscsi_tcp_conn *tcp_conn, struct iscsi_cmd_task *ctask,
- void *buf, int buf_size, int offset)
-{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- int buf_left = buf_size - (tcp_conn->data_copied + offset);
- unsigned size = min(tcp_conn->in.copy, buf_left);
- int rc;
-
- size = min(size, ctask->data_count);
-
- debug_tcp("ctask_copy %d bytes at offset %d copied %d\n",
- size, tcp_conn->in.offset, tcp_conn->in.copied);
-
- BUG_ON(size <= 0);
- BUG_ON(tcp_ctask->sent + size > scsi_bufflen(ctask->sc));
-
- rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
- (char*)buf + (offset + tcp_conn->data_copied), size);
- /* must fit into skb->len */
- BUG_ON(rc);
-
- tcp_conn->in.offset += size;
- tcp_conn->in.copy -= size;
- tcp_conn->in.copied += size;
- tcp_conn->data_copied += size;
- tcp_ctask->sent += size;
- ctask->data_count -= size;
-
- BUG_ON(tcp_conn->in.copy < 0);
- BUG_ON(ctask->data_count < 0);
-
- if (buf_size != (tcp_conn->data_copied + offset)) {
- if (!ctask->data_count) {
- BUG_ON(buf_size - tcp_conn->data_copied < 0);
- /* done with this PDU */
- return buf_size - tcp_conn->data_copied;
- }
- return -EAGAIN;
+ 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);
}
- /* done with this buffer or with both - PDU and buffer */
- tcp_conn->data_copied = 0;
- return 0;
+ return rc;
}
/**
- * iscsi_tcp_copy - copy skb bits to the destanation buffer
- * @conn: iscsi tcp connection
+ * iscsi_tcp_hdr_recv_done - process PDU header
*
- * Notes:
- * The function calls skb_copy_bits() and updates per-connection
- * byte counters.
- **/
-static inline int
-iscsi_tcp_copy(struct iscsi_conn *conn, int buf_size)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int buf_left = buf_size - tcp_conn->data_copied;
- int size = min(tcp_conn->in.copy, buf_left);
- int rc;
-
- debug_tcp("tcp_copy %d bytes at offset %d copied %d\n",
- size, tcp_conn->in.offset, tcp_conn->data_copied);
- BUG_ON(size <= 0);
-
- rc = skb_copy_bits(tcp_conn->in.skb, tcp_conn->in.offset,
- (char*)conn->data + tcp_conn->data_copied, size);
- BUG_ON(rc);
-
- tcp_conn->in.offset += size;
- tcp_conn->in.copy -= size;
- tcp_conn->in.copied += size;
- tcp_conn->data_copied += size;
-
- if (buf_size != tcp_conn->data_copied)
- return -EAGAIN;
-
- return 0;
-}
-
-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);
-}
-
-static void
-iscsi_recv_digest_update(struct iscsi_tcp_conn *tcp_conn, char* buf, int len)
-{
- struct scatterlist tmp;
-
- sg_init_one(&tmp, buf, len);
- crypto_hash_update(&tcp_conn->rx_hash, &tmp, len);
-}
-
-static int iscsi_scsi_data_in(struct iscsi_conn *conn)
+ * 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_tcp_conn *tcp_conn = conn->dd_data;
- struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct scsi_cmnd *sc = ctask->sc;
- struct scatterlist *sg;
- int i, offset, rc = 0;
-
- BUG_ON((void*)ctask != sc->SCp.ptr);
-
- offset = tcp_ctask->data_offset;
- sg = scsi_sglist(sc);
-
- if (tcp_ctask->data_offset)
- for (i = 0; i < tcp_ctask->sg_count; i++)
- offset -= sg[i].length;
- /* we've passed through partial sg*/
- if (offset < 0)
- offset = 0;
-
- for (i = tcp_ctask->sg_count; i < scsi_sg_count(sc); i++) {
- char *dest;
-
- dest = kmap_atomic(sg_page(&sg[i]), KM_SOFTIRQ0);
- rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
- sg[i].length, offset);
- kunmap_atomic(dest, KM_SOFTIRQ0);
- if (rc == -EAGAIN)
- /* continue with the next SKB/PDU */
- return rc;
- if (!rc) {
- if (conn->datadgst_en) {
- if (!offset)
- crypto_hash_update(
- &tcp_conn->rx_hash,
- &sg[i], sg[i].length);
- else
- partial_sg_digest_update(
- &tcp_conn->rx_hash,
- &sg[i],
- sg[i].offset + offset,
- sg[i].length - offset);
- }
- offset = 0;
- tcp_ctask->sg_count++;
- }
-
- if (!ctask->data_count) {
- if (rc && conn->datadgst_en)
- /*
- * data-in is complete, but buffer not...
- */
- partial_sg_digest_update(&tcp_conn->rx_hash,
- &sg[i],
- sg[i].offset,
- sg[i].length-rc);
- rc = 0;
- break;
- }
-
- if (!tcp_conn->in.copy)
- return -EAGAIN;
- }
- BUG_ON(ctask->data_count);
+ struct iscsi_conn *conn = tcp_conn->iscsi_conn;
+ struct iscsi_hdr *hdr;
- /* check for non-exceptional status */
- if (tcp_conn->in.hdr->flags & ISCSI_FLAG_DATA_STATUS) {
- debug_scsi("done [sc %lx res %d itt 0x%x flags 0x%x]\n",
- (long)sc, sc->result, ctask->itt,
- tcp_conn->in.hdr->flags);
- spin_lock(&conn->session->lock);
- __iscsi_complete_pdu(conn, tcp_conn->in.hdr, NULL, 0);
- spin_unlock(&conn->session->lock);
+ /* 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;
}
- return rc;
-}
-
-static int
-iscsi_data_recv(struct iscsi_conn *conn)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int rc = 0, opcode;
-
- opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
- switch (opcode) {
- case ISCSI_OP_SCSI_DATA_IN:
- rc = iscsi_scsi_data_in(conn);
- break;
- case ISCSI_OP_SCSI_CMD_RSP:
- case ISCSI_OP_TEXT_RSP:
- case ISCSI_OP_LOGIN_RSP:
- case ISCSI_OP_ASYNC_EVENT:
- case ISCSI_OP_REJECT:
- /*
- * Collect data segment to the connection's data
- * placeholder
- */
- if (iscsi_tcp_copy(conn, tcp_conn->in.datalen)) {
- rc = -EAGAIN;
- goto exit;
+ /* 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) {
+ iscsi_tcp_segment_splice_digest(segment,
+ segment->recv_digest);
+ return 0;
}
+ iscsi_tcp_dgst_header(&tcp_conn->rx_hash, hdr,
+ segment->total_copied - ISCSI_DIGEST_SIZE,
+ segment->digest);
- rc = iscsi_complete_pdu(conn, tcp_conn->in.hdr, conn->data,
- tcp_conn->in.datalen);
- if (!rc && conn->datadgst_en && opcode != ISCSI_OP_LOGIN_RSP)
- iscsi_recv_digest_update(tcp_conn, conn->data,
- tcp_conn->in.datalen);
- break;
- default:
- BUG_ON(1);
+ if (!iscsi_tcp_dgst_verify(tcp_conn, segment))
+ return ISCSI_ERR_HDR_DGST;
}
-exit:
- return rc;
+
+ tcp_conn->in.hdr = hdr;
+ return iscsi_tcp_hdr_dissect(conn, hdr);
}
/**
- * iscsi_tcp_data_recv - TCP receive in sendfile fashion
+ * 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_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
- unsigned int offset, size_t len)
+iscsi_tcp_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
+ unsigned int offset, size_t len)
{
- int rc;
struct iscsi_conn *conn = rd_desc->arg.data;
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int processed;
- char pad[ISCSI_PAD_LEN];
- struct scatterlist sg;
-
- /*
- * Save current SKB and its offset in the corresponding
- * connection context.
- */
- tcp_conn->in.copy = skb->len - offset;
- tcp_conn->in.offset = offset;
- tcp_conn->in.skb = skb;
- tcp_conn->in.len = tcp_conn->in.copy;
- BUG_ON(tcp_conn->in.copy <= 0);
- debug_tcp("in %d bytes\n", tcp_conn->in.copy);
+ struct iscsi_segment *segment = &tcp_conn->in.segment;
+ struct skb_seq_state seq;
+ unsigned int consumed = 0;
+ int rc = 0;
-more:
- tcp_conn->in.copied = 0;
- 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;
}
- if (tcp_conn->in_progress == IN_PROGRESS_WAIT_HEADER ||
- tcp_conn->in_progress == IN_PROGRESS_HEADER_GATHER) {
- rc = iscsi_hdr_extract(tcp_conn);
- if (rc) {
- if (rc == -EAGAIN)
- goto nomore;
- else {
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- return 0;
- }
- }
+ skb_prepare_seq_read(skb, offset, skb->len, &seq);
+ while (1) {
+ unsigned int avail;
+ const u8 *ptr;
- /*
- * Verify and process incoming PDU header.
- */
- rc = iscsi_tcp_hdr_recv(conn);
- if (!rc && tcp_conn->in.datalen) {
- if (conn->datadgst_en)
- crypto_hash_init(&tcp_conn->rx_hash);
- tcp_conn->in_progress = IN_PROGRESS_DATA_RECV;
- } else if (rc) {
- iscsi_conn_failure(conn, rc);
- return 0;
+ avail = skb_seq_read(consumed, &ptr, &seq);
+ if (avail == 0) {
+ debug_tcp("no more data avail. Consumed %d\n",
+ consumed);
+ break;
}
- }
-
- if (tcp_conn->in_progress == IN_PROGRESS_DDIGEST_RECV &&
- tcp_conn->in.copy) {
- uint32_t recv_digest;
-
- debug_tcp("extra data_recv offset %d copy %d\n",
- tcp_conn->in.offset, tcp_conn->in.copy);
-
- if (!tcp_conn->data_copied) {
- if (tcp_conn->in.padding) {
- debug_tcp("padding -> %d\n",
- tcp_conn->in.padding);
- memset(pad, 0, tcp_conn->in.padding);
- sg_init_one(&sg, pad, tcp_conn->in.padding);
- crypto_hash_update(&tcp_conn->rx_hash,
- &sg, sg.length);
+ BUG_ON(segment->copied >= segment->size);
+
+ 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;
+
+ if (segment->total_copied >= segment->total_size) {
+ debug_tcp("segment done\n");
+ rc = segment->done(tcp_conn, segment);
+ if (rc != 0) {
+ skb_abort_seq_read(&seq);
+ goto error;
}
- crypto_hash_final(&tcp_conn->rx_hash,
- (u8 *) &tcp_conn->in.datadgst);
- debug_tcp("rx digest 0x%x\n", tcp_conn->in.datadgst);
- }
- rc = iscsi_tcp_copy(conn, sizeof(uint32_t));
- if (rc) {
- if (rc == -EAGAIN)
- goto again;
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- return 0;
- }
-
- memcpy(&recv_digest, conn->data, sizeof(uint32_t));
- if (recv_digest != tcp_conn->in.datadgst) {
- debug_tcp("iscsi_tcp: data digest error!"
- "0x%x != 0x%x\n", recv_digest,
- tcp_conn->in.datadgst);
- iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
- return 0;
- } else {
- debug_tcp("iscsi_tcp: data digest match!"
- "0x%x == 0x%x\n", recv_digest,
- tcp_conn->in.datadgst);
- tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
+ /* The done() functions sets up the
+ * next segment. */
}
}
+ skb_abort_seq_read(&seq);
+ conn->rxdata_octets += consumed;
+ return consumed;
- if (tcp_conn->in_progress == IN_PROGRESS_DATA_RECV &&
- tcp_conn->in.copy) {
- debug_tcp("data_recv offset %d copy %d\n",
- tcp_conn->in.offset, tcp_conn->in.copy);
-
- rc = iscsi_data_recv(conn);
- if (rc) {
- if (rc == -EAGAIN)
- goto again;
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- return 0;
- }
-
- if (tcp_conn->in.padding)
- tcp_conn->in_progress = IN_PROGRESS_PAD_RECV;
- else if (conn->datadgst_en)
- tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
- else
- tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- tcp_conn->data_copied = 0;
- }
-
- if (tcp_conn->in_progress == IN_PROGRESS_PAD_RECV &&
- tcp_conn->in.copy) {
- int copylen = min(tcp_conn->in.padding - tcp_conn->data_copied,
- tcp_conn->in.copy);
-
- tcp_conn->in.copy -= copylen;
- tcp_conn->in.offset += copylen;
- tcp_conn->data_copied += copylen;
-
- if (tcp_conn->data_copied != tcp_conn->in.padding)
- tcp_conn->in_progress = IN_PROGRESS_PAD_RECV;
- else if (conn->datadgst_en)
- tcp_conn->in_progress = IN_PROGRESS_DDIGEST_RECV;
- else
- tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- tcp_conn->data_copied = 0;
- }
-
- debug_tcp("f, processed %d from out of %d padding %d\n",
- tcp_conn->in.offset - offset, (int)len, tcp_conn->in.padding);
- BUG_ON(tcp_conn->in.offset - offset > len);
-
- if (tcp_conn->in.offset - offset != len) {
- debug_tcp("continue to process %d bytes\n",
- (int)len - (tcp_conn->in.offset - offset));
- goto more;
- }
-
-nomore:
- processed = tcp_conn->in.offset - offset;
- BUG_ON(processed == 0);
- return processed;
-
-again:
- processed = tcp_conn->in.offset - offset;
- debug_tcp("c, processed %d from out of %d rd_desc_cnt %d\n",
- processed, (int)len, (int)rd_desc->count);
- BUG_ON(processed == 0);
- BUG_ON(processed > len);
-
- conn->rxdata_octets += processed;
- return processed;
+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)
{
struct iscsi_conn *conn = sk->sk_user_data;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
read_descriptor_t rd_desc;
read_lock(&sk->sk_callback_lock);
/*
- * Use rd_desc to pass 'conn' to iscsi_tcp_data_recv.
+ * Use rd_desc to pass 'conn' to iscsi_tcp_recv.
* We set count to 1 because we want the network layer to
- * hand us all the skbs that are available. iscsi_tcp_data_recv
+ * hand us all the skbs that are available. iscsi_tcp_recv
* handled pdus that cross buffers or pdus that still need data.
*/
rd_desc.arg.data = conn;
rd_desc.count = 1;
- tcp_read_sock(sk, &rd_desc, iscsi_tcp_data_recv);
+ tcp_read_sock(sk, &rd_desc, iscsi_tcp_recv);
read_unlock(&sk->sk_callback_lock);
+
+ /* If we had to (atomically) map a highmem page,
+ * unmap it now. */
+ iscsi_tcp_segment_unmap(&tcp_conn->in.segment);
}
static void
@@ -1077,121 +1079,173 @@ iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
}
/**
- * 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)
+ * iscsi_xmit - TCP transmit
+ **/
+static int
+iscsi_xmit(struct iscsi_conn *conn)
{
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct socket *sk = tcp_conn->sock;
- int offset = buf->sg.offset + buf->sent, res;
+ struct iscsi_segment *segment = &tcp_conn->out.segment;
+ unsigned int consumed = 0;
+ int rc = 0;
- /*
- * 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, sg_page(&buf->sg), offset, size, flags);
- else
- res = tcp_conn->sendpage(sk, sg_page(&buf->sg), offset, size, flags);
-
- if (res >= 0) {
- conn->txdata_octets += res;
- buf->sent += res;
- return res;
+ while (1) {
+ rc = iscsi_tcp_xmit_segment(tcp_conn, segment);
+ if (rc < 0)
+ goto error;
+ if (rc == 0)
+ break;
+
+ consumed += rc;
+
+ if (segment->total_copied >= segment->total_size) {
+ if (segment->done != NULL) {
+ rc = segment->done(tcp_conn, segment);
+ if (rc < 0)
+ goto error;
+ }
+ }
}
- tcp_conn->sendpage_failures_cnt++;
- if (res == -EAGAIN)
- res = -ENOBUFS;
- else
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- return res;
+ debug_tcp("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_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ return rc;
}
/**
- * 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)
- **/
+ * iscsi_tcp_xmit_qlen - return the number of bytes queued for xmit
+ */
static inline int
-iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen)
+iscsi_tcp_xmit_qlen(struct iscsi_conn *conn)
{
- 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;
- }
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct iscsi_segment *segment = &tcp_conn->out.segment;
- return res;
+ return segment->total_copied - segment->total_size;
}
-/**
- * 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)
+iscsi_tcp_flush(struct iscsi_conn *conn)
{
- 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)
+ int rc;
+
+ while (iscsi_tcp_xmit_qlen(conn)) {
+ rc = iscsi_xmit(conn);
+ if (rc == 0)
return -EAGAIN;
- return 0;
+ if (rc < 0)
+ return rc;
}
- return res;
+ return 0;
}
-static inline void
-iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
- struct iscsi_tcp_cmd_task *tcp_ctask)
+/*
+ * 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)
+{
+ 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);
+ return 0;
+}
+
+static void
+iscsi_tcp_send_hdr_prep(struct iscsi_conn *conn, void *hdr, size_t hdrlen)
{
- crypto_hash_init(&tcp_conn->tx_hash);
- tcp_ctask->digest_count = 4;
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+
+ debug_tcp("%s(%p%s)\n", __FUNCTION__, tcp_conn,
+ conn->hdrdgst_en? ", digest enabled" : "");
+
+ /* 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));
+
+ /* If header digest is enabled, compute the CRC and
+ * place the digest into the same buffer. We make
+ * sure that both iscsi_tcp_ctask and mtask have
+ * sufficient room.
+ */
+ if (conn->hdrdgst_en) {
+ iscsi_tcp_dgst_header(&tcp_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;
+
+ iscsi_segment_init_linear(&tcp_conn->out.segment, hdr, hdrlen,
+ iscsi_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_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 hash_desc *tx_hash = NULL;
+ unsigned int hdr_spec_len;
+
+ debug_tcp("%s(%p, offset=%d, datalen=%d%s)\n", __FUNCTION__,
+ tcp_conn, offset, len,
+ conn->datadgst_en? ", digest enabled" : "");
+
+ /* Make sure the datalen matches what the caller
+ said he would send. */
+ hdr_spec_len = ntoh24(tcp_conn->out.hdr->dlength);
+ WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
+
+ if (conn->datadgst_en)
+ tx_hash = &tcp_conn->tx_hash;
+
+ return iscsi_segment_seek_sg(&tcp_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,
+ size_t len)
+{
+ struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
+ struct hash_desc *tx_hash = NULL;
+ unsigned int hdr_spec_len;
+
+ debug_tcp("%s(%p, datalen=%d%s)\n", __FUNCTION__, tcp_conn, len,
+ conn->datadgst_en? ", digest enabled" : "");
+
+ /* Make sure the datalen matches what the caller
+ said he would send. */
+ hdr_spec_len = ntoh24(tcp_conn->out.hdr->dlength);
+ WARN_ON(iscsi_padded(len) != iscsi_padded(hdr_spec_len));
+
+ if (conn->datadgst_en)
+ tx_hash = &tcp_conn->tx_hash;
+
+ iscsi_segment_init_linear(&tcp_conn->out.data_segment,
+ data, len, NULL, tx_hash);
}
/**
@@ -1207,12 +1261,17 @@ iscsi_data_digest_init(struct iscsi_tcp_conn *tcp_conn,
*
* Called under connection lock.
**/
-static void
+static int
iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct iscsi_r2t_info *r2t, int left)
+ struct iscsi_r2t_info *r2t)
{
struct iscsi_data *hdr;
- int new_offset;
+ 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));
@@ -1233,43 +1292,46 @@ iscsi_solicit_data_cont(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
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;
-
- iscsi_buf_init_sg(&r2t->sendbuf, r2t->sg);
- r2t->sg += 1;
-}
-static void iscsi_set_padding(struct iscsi_tcp_cmd_task *tcp_ctask,
- unsigned long len)
-{
- tcp_ctask->pad_count = len & (ISCSI_PAD_LEN - 1);
- if (!tcp_ctask->pad_count)
- return;
-
- tcp_ctask->pad_count = ISCSI_PAD_LEN - tcp_ctask->pad_count;
- debug_scsi("write padding %d bytes\n", tcp_ctask->pad_count);
- set_bit(XMSTATE_BIT_W_PAD, &tcp_ctask->xmstate);
+ conn->dataout_pdus_cnt++;
+ return 1;
}
/**
- * iscsi_tcp_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
+ * iscsi_tcp_ctask - 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)
+static int
+iscsi_tcp_ctask_init(struct iscsi_cmd_task *ctask)
{
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ struct iscsi_conn *conn = ctask->conn;
+ struct scsi_cmnd *sc = ctask->sc;
+ int err;
BUG_ON(__kfifo_len(tcp_ctask->r2tqueue));
- tcp_ctask->xmstate = 1 << XMSTATE_BIT_CMD_HDR_INIT;
+ tcp_ctask->sent = 0;
+ tcp_ctask->exp_datasn = 0;
+
+ /* Prepare PDU, optionally w/ immediate data */
+ debug_scsi("ctask deq [cid %d itt 0x%x imm %d unsol %d]\n",
+ conn->id, ctask->itt, ctask->imm_count,
+ ctask->unsol_count);
+ iscsi_tcp_send_hdr_prep(conn, ctask->hdr, ctask->hdr_len);
+
+ if (!ctask->imm_count)
+ return 0;
+
+ /* If we have immediate data, attach a payload */
+ err = iscsi_tcp_send_data_prep(conn, scsi_sglist(sc), scsi_sg_count(sc),
+ 0, ctask->imm_count);
+ if (err)
+ return err;
+ tcp_ctask->sent += ctask->imm_count;
+ ctask->imm_count = 0;
+ return 0;
}
/**
@@ -1281,484 +1343,130 @@ iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
* The function can return -EAGAIN in which case caller must
* call it again later, or recover. '0' return code means successful
* xmit.
- *
- * Management xmit state machine consists of these states:
- * XMSTATE_BIT_IMM_HDR_INIT - calculate digest of PDU Header
- * XMSTATE_BIT_IMM_HDR - PDU Header xmit in progress
- * XMSTATE_BIT_IMM_DATA - PDU Data xmit in progress
- * XMSTATE_VALUE_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 (test_bit(XMSTATE_BIT_IMM_HDR_INIT, &tcp_mtask->xmstate)) {
- iscsi_buf_init_iov(&tcp_mtask->headbuf, (char*)mtask->hdr,
- sizeof(struct iscsi_hdr));
-
- if (mtask->data_count) {
- set_bit(XMSTATE_BIT_IMM_DATA, &tcp_mtask->xmstate);
- iscsi_buf_init_iov(&tcp_mtask->sendbuf,
- (char*)mtask->data,
- mtask->data_count);
- }
-
- 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;
- clear_bit(XMSTATE_BIT_IMM_HDR_INIT, &tcp_mtask->xmstate);
- set_bit(XMSTATE_BIT_IMM_HDR, &tcp_mtask->xmstate);
- }
-
- if (test_bit(XMSTATE_BIT_IMM_HDR, &tcp_mtask->xmstate)) {
- rc = iscsi_sendhdr(conn, &tcp_mtask->headbuf,
- mtask->data_count);
- if (rc)
- return rc;
- clear_bit(XMSTATE_BIT_IMM_HDR, &tcp_mtask->xmstate);
- }
-
- if (test_and_clear_bit(XMSTATE_BIT_IMM_DATA, &tcp_mtask->xmstate)) {
- BUG_ON(!mtask->data_count);
- /* 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) {
- set_bit(XMSTATE_BIT_IMM_DATA, &tcp_mtask->xmstate);
- return rc;
- }
- } while (mtask->data_count);
- }
+ /* Flush any pending data first. */
+ rc = iscsi_tcp_flush(conn);
+ if (rc < 0)
+ return rc;
- BUG_ON(tcp_mtask->xmstate != XMSTATE_VALUE_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*));
+ iscsi_free_mgmt_task(conn, mtask);
spin_unlock_bh(&session->lock);
}
+
return 0;
}
+/*
+ * iscsi_tcp_ctask_xmit - xmit normal PDU task
+ * @conn: iscsi connection
+ * @ctask: 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_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
{
- struct scsi_cmnd *sc = ctask->sc;
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
+ struct scsi_cmnd *sc = ctask->sc;
int rc = 0;
- if (test_bit(XMSTATE_BIT_CMD_HDR_INIT, &tcp_ctask->xmstate)) {
- 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);
-
- iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
- tcp_ctask->sg = sg + 1;
- tcp_ctask->bad_sg = sg + scsi_sg_count(sc);
-
- 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);
- }
-
- 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);
- clear_bit(XMSTATE_BIT_CMD_HDR_INIT, &tcp_ctask->xmstate);
- set_bit(XMSTATE_BIT_CMD_HDR_XMIT, &tcp_ctask->xmstate);
- }
-
- if (test_bit(XMSTATE_BIT_CMD_HDR_XMIT, &tcp_ctask->xmstate)) {
- rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->imm_count);
- if (rc)
- return rc;
- clear_bit(XMSTATE_BIT_CMD_HDR_XMIT, &tcp_ctask->xmstate);
-
- if (sc->sc_data_direction != DMA_TO_DEVICE)
- return 0;
-
- if (ctask->imm_count) {
- set_bit(XMSTATE_BIT_IMM_DATA, &tcp_ctask->xmstate);
- 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;
- }
- }
-
- if (ctask->unsol_count) {
- set_bit(XMSTATE_BIT_UNS_HDR, &tcp_ctask->xmstate);
- set_bit(XMSTATE_BIT_UNS_INIT, &tcp_ctask->xmstate);
- }
- }
- return rc;
-}
-
-static int
-iscsi_send_padding(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- int sent = 0, rc;
-
- if (test_bit(XMSTATE_BIT_W_PAD, &tcp_ctask->xmstate)) {
- 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 (!test_bit(XMSTATE_BIT_W_RESEND_PAD, &tcp_ctask->xmstate))
- return 0;
-
- clear_bit(XMSTATE_BIT_W_PAD, &tcp_ctask->xmstate);
- clear_bit(XMSTATE_BIT_W_RESEND_PAD, &tcp_ctask->xmstate);
- 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);
- set_bit(XMSTATE_BIT_W_RESEND_PAD, &tcp_ctask->xmstate);
- }
- return rc;
-}
-
-static int
-iscsi_send_digest(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
- struct iscsi_buf *buf, uint32_t *digest)
-{
- 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;
-
- if (!test_bit(XMSTATE_BIT_W_RESEND_DATA_DIGEST, &tcp_ctask->xmstate)) {
- crypto_hash_final(&tcp_conn->tx_hash, (u8*)digest);
- iscsi_buf_init_iov(buf, (char*)digest, 4);
- }
- clear_bit(XMSTATE_BIT_W_RESEND_DATA_DIGEST, &tcp_ctask->xmstate);
-
- 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);
- set_bit(XMSTATE_BIT_W_RESEND_DATA_DIGEST, &tcp_ctask->xmstate);
- }
- return rc;
-}
-
-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)
-{
- 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;
- }
-
- rc = iscsi_send_padding(conn, ctask);
- if (rc)
+flush:
+ /* Flush any pending data first. */
+ rc = iscsi_tcp_flush(conn);
+ if (rc < 0)
return rc;
- return iscsi_send_digest(conn, ctask, digestbuf, digest);
-}
-
-static int
-iscsi_send_unsol_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- struct iscsi_data_task *dtask;
- int rc;
-
- set_bit(XMSTATE_BIT_UNS_DATA, &tcp_ctask->xmstate);
- if (test_bit(XMSTATE_BIT_UNS_INIT, &tcp_ctask->xmstate)) {
- dtask = &tcp_ctask->unsol_dtask;
-
- 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);
-
- clear_bit(XMSTATE_BIT_UNS_INIT, &tcp_ctask->xmstate);
- iscsi_set_padding(tcp_ctask, ctask->data_count);
- }
-
- rc = iscsi_sendhdr(conn, &tcp_ctask->headbuf, ctask->data_count);
- if (rc) {
- clear_bit(XMSTATE_BIT_UNS_DATA, &tcp_ctask->xmstate);
- set_bit(XMSTATE_BIT_UNS_HDR, &tcp_ctask->xmstate);
- return rc;
- }
+ /* Are we done already? */
+ if (sc->sc_data_direction != DMA_TO_DEVICE)
+ return 0;
- if (conn->datadgst_en) {
- dtask = &tcp_ctask->unsol_dtask;
- iscsi_data_digest_init(ctask->conn->dd_data, tcp_ctask);
- dtask->digest = 0;
- }
+ if (ctask->unsol_count != 0) {
+ struct iscsi_data *hdr = &tcp_ctask->unsol_dtask.hdr;
- debug_scsi("uns dout [itt 0x%x dlen %d sent %d]\n",
- ctask->itt, ctask->unsol_count, tcp_ctask->sent);
- return 0;
-}
+ /* Prepare a header for the unsolicited PDU.
+ * The amount of data we want to send will be
+ * in ctask->data_count.
+ * FIXME: return the data count instead.
+ */
+ iscsi_prep_unsolicit_data_pdu(ctask, hdr);
-static int
-iscsi_send_unsol_pdu(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- int rc;
+ debug_tcp("unsol dout [itt 0x%x doff %d dlen %d]\n",
+ ctask->itt, tcp_ctask->sent, ctask->data_count);
- if (test_and_clear_bit(XMSTATE_BIT_UNS_HDR, &tcp_ctask->xmstate)) {
- BUG_ON(!ctask->unsol_count);
-send_hdr:
- rc = iscsi_send_unsol_hdr(conn, ctask);
+ iscsi_tcp_send_hdr_prep(conn, hdr, sizeof(*hdr));
+ rc = iscsi_tcp_send_data_prep(conn, scsi_sglist(sc),
+ scsi_sg_count(sc),
+ tcp_ctask->sent,
+ ctask->data_count);
if (rc)
- return rc;
- }
-
- if (test_bit(XMSTATE_BIT_UNS_DATA, &tcp_ctask->xmstate)) {
- struct iscsi_data_task *dtask = &tcp_ctask->unsol_dtask;
- int start = tcp_ctask->sent;
+ goto fail;
+ tcp_ctask->sent += ctask->data_count;
+ ctask->unsol_count -= ctask->data_count;
+ goto flush;
+ } else {
+ struct iscsi_session *session = conn->session;
+ struct iscsi_r2t_info *r2t;
- 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;
- clear_bit(XMSTATE_BIT_UNS_DATA, &tcp_ctask->xmstate);
- /*
- * Done with the Data-Out. Next, check if we need
- * to send another unsolicited Data-Out.
+ /* All unsolicited PDUs sent. Check for solicited PDUs.
*/
- if (ctask->unsol_count) {
- debug_scsi("sending more uns\n");
- set_bit(XMSTATE_BIT_UNS_INIT, &tcp_ctask->xmstate);
- goto send_hdr;
+ spin_lock_bh(&session->lock);
+ r2t = tcp_ctask->r2t;
+ if (r2t != NULL) {
+ /* Continue with this R2T? */
+ if (!iscsi_solicit_data_cont(conn, ctask, r2t)) {
+ debug_scsi(" done with r2t %p\n", r2t);
+
+ __kfifo_put(tcp_ctask->r2tpool.queue,
+ (void*)&r2t, sizeof(void*));
+ tcp_ctask->r2t = r2t = NULL;
+ }
}
- }
- return 0;
-}
-
-static int iscsi_send_sol_pdu(struct iscsi_conn *conn,
- struct iscsi_cmd_task *ctask)
-{
- 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 (test_bit(XMSTATE_BIT_SOL_HDR_INIT, &tcp_ctask->xmstate)) {
- if (!tcp_ctask->r2t) {
- spin_lock_bh(&session->lock);
+ if (r2t == NULL) {
__kfifo_get(tcp_ctask->r2tqueue, (void*)&tcp_ctask->r2t,
sizeof(void*));
- spin_unlock_bh(&session->lock);
+ r2t = tcp_ctask->r2t;
}
-send_hdr:
- r2t = tcp_ctask->r2t;
- dtask = &r2t->dtask;
-
- if (conn->hdrdgst_en)
- iscsi_hdr_digest(conn, &r2t->headbuf,
- (u8*)dtask->hdrext);
- clear_bit(XMSTATE_BIT_SOL_HDR_INIT, &tcp_ctask->xmstate);
- set_bit(XMSTATE_BIT_SOL_HDR, &tcp_ctask->xmstate);
- }
-
- if (test_bit(XMSTATE_BIT_SOL_HDR, &tcp_ctask->xmstate)) {
- r2t = tcp_ctask->r2t;
- dtask = &r2t->dtask;
-
- rc = iscsi_sendhdr(conn, &r2t->headbuf, r2t->data_count);
- if (rc)
- return rc;
- clear_bit(XMSTATE_BIT_SOL_HDR, &tcp_ctask->xmstate);
- set_bit(XMSTATE_BIT_SOL_DATA, &tcp_ctask->xmstate);
+ spin_unlock_bh(&session->lock);
- if (conn->datadgst_en) {
- iscsi_data_digest_init(conn->dd_data, tcp_ctask);
- dtask->digest = 0;
+ /* Waiting for more R2Ts to arrive. */
+ if (r2t == NULL) {
+ debug_tcp("no R2Ts yet\n");
+ return 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);
- }
+ debug_scsi("sol dout %p [dsn %d itt 0x%x doff %d dlen %d]\n",
+ r2t, r2t->solicit_datasn - 1, ctask->itt,
+ r2t->data_offset + r2t->sent, r2t->data_count);
- if (test_bit(XMSTATE_BIT_SOL_DATA, &tcp_ctask->xmstate)) {
- r2t = tcp_ctask->r2t;
- dtask = &r2t->dtask;
+ iscsi_tcp_send_hdr_prep(conn, &r2t->dtask.hdr,
+ sizeof(struct iscsi_hdr));
- rc = iscsi_send_data(ctask, &r2t->sendbuf, &r2t->sg,
- &r2t->sent, &r2t->data_count,
- &dtask->digestbuf, &dtask->digest);
+ rc = iscsi_tcp_send_data_prep(conn, scsi_sglist(sc),
+ scsi_sg_count(sc),
+ r2t->data_offset + r2t->sent,
+ r2t->data_count);
if (rc)
- return rc;
- clear_bit(XMSTATE_BIT_SOL_DATA, &tcp_ctask->xmstate);
-
- /*
- * 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;
- }
-
- /*
- * 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);
+ goto fail;
+ tcp_ctask->sent += r2t->data_count;
+ r2t->sent += r2t->data_count;
+ goto flush;
}
return 0;
-}
-
-/**
- * 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_BIT_CMD_HDR_INIT - prepare Header and Data buffers Calculate
- * Header Digest
- * XMSTATE_BIT_CMD_HDR_XMIT - Transmit header in progress
- *
- *iscsi_send_padding
- * XMSTATE_BIT_W_PAD - Prepare and send pading
- * XMSTATE_BIT_W_RESEND_PAD - retry send pading
- *
- *iscsi_send_digest
- * XMSTATE_BIT_W_RESEND_DATA_DIGEST - Finalize and send Data Digest
- * XMSTATE_BIT_W_RESEND_DATA_DIGEST - retry sending digest
- *
- *iscsi_send_unsol_hdr
- * XMSTATE_BIT_UNS_INIT - prepare un-solicit data header and digest
- * XMSTATE_BIT_UNS_HDR - send un-solicit header
- *
- *iscsi_send_unsol_pdu
- * XMSTATE_BIT_UNS_DATA - send un-solicit data in progress
- *
- *iscsi_send_sol_pdu
- * XMSTATE_BIT_SOL_HDR_INIT - solicit data header and digest initialize
- * XMSTATE_BIT_SOL_HDR - send solicit header
- * XMSTATE_BIT_SOL_DATA - send solicit data
- *
- *iscsi_tcp_ctask_xmit
- * XMSTATE_BIT_IMM_DATA - xmit managment data (??)
- **/
-static int
-iscsi_tcp_ctask_xmit(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
-{
- struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- int rc = 0;
-
- debug_scsi("ctask deq [cid %d xmstate %x itt 0x%x]\n",
- conn->id, tcp_ctask->xmstate, ctask->itt);
-
- rc = iscsi_send_cmd_hdr(conn, ctask);
- if (rc)
- return rc;
- if (ctask->sc->sc_data_direction != DMA_TO_DEVICE)
- return 0;
-
- if (test_bit(XMSTATE_BIT_IMM_DATA, &tcp_ctask->xmstate)) {
- 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;
- clear_bit(XMSTATE_BIT_IMM_DATA, &tcp_ctask->xmstate);
- }
-
- rc = iscsi_send_unsol_pdu(conn, ctask);
- if (rc)
- return rc;
-
- rc = iscsi_send_sol_pdu(conn, ctask);
- if (rc)
- return rc;
-
- return rc;
+fail:
+ iscsi_conn_failure(conn, rc);
+ return -EIO;
}
static struct iscsi_cls_conn *
@@ -1784,9 +1492,6 @@ iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
conn->dd_data = tcp_conn;
tcp_conn->iscsi_conn = conn;
- tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
- /* initial operational parameters */
- tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
tcp_conn->tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
CRYPTO_ALG_ASYNC);
@@ -1863,11 +1568,9 @@ static void
iscsi_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;
iscsi_conn_stop(cls_conn, flag);
iscsi_tcp_release_conn(conn);
- tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
}
static int iscsi_tcp_get_addr(struct iscsi_conn *conn, struct socket *sock,
@@ -1967,7 +1670,7 @@ iscsi_tcp_conn_bind(struct iscsi_cls_session *cls_session,
/*
* set receive state machine into initial state
*/
- tcp_conn->in_progress = IN_PROGRESS_WAIT_HEADER;
+ iscsi_tcp_hdr_recv_prep(tcp_conn);
return 0;
free_socket:
@@ -1977,10 +1680,17 @@ free_socket:
/* called with host lock */
static void
-iscsi_tcp_mgmt_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
+iscsi_tcp_mtask_init(struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask)
{
- struct iscsi_tcp_mgmt_task *tcp_mtask = mtask->dd_data;
- tcp_mtask->xmstate = 1 << XMSTATE_BIT_IMM_HDR_INIT;
+ debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt);
+
+ /* Prepare PDU, optionally w/ immediate data */
+ iscsi_tcp_send_hdr_prep(conn, mtask->hdr, sizeof(*mtask->hdr));
+
+ /* If we have immediate data, attach a payload */
+ if (mtask->data_count)
+ iscsi_tcp_send_linear_data_prepare(conn, mtask->data,
+ mtask->data_count);
}
static int
@@ -2003,8 +1713,7 @@ iscsi_r2tpool_alloc(struct iscsi_session *session)
*/
/* R2T pool */
- if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
- (void***)&tcp_ctask->r2ts,
+ if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, NULL,
sizeof(struct iscsi_r2t_info))) {
goto r2t_alloc_fail;
}
@@ -2013,8 +1722,7 @@ iscsi_r2tpool_alloc(struct iscsi_session *session)
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);
+ iscsi_pool_free(&tcp_ctask->r2tpool);
goto r2t_alloc_fail;
}
}
@@ -2027,8 +1735,7 @@ r2t_alloc_fail:
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);
+ iscsi_pool_free(&tcp_ctask->r2tpool);
}
return -ENOMEM;
}
@@ -2043,8 +1750,7 @@ iscsi_r2tpool_free(struct iscsi_session *session)
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);
+ iscsi_pool_free(&tcp_ctask->r2tpool);
}
}
@@ -2060,9 +1766,6 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
switch(param) {
case ISCSI_PARAM_HDRDGST_EN:
iscsi_set_param(cls_conn, param, buf, buflen);
- tcp_conn->hdr_size = sizeof(struct iscsi_hdr);
- if (conn->hdrdgst_en)
- tcp_conn->hdr_size += sizeof(__u32);
break;
case ISCSI_PARAM_DATADGST_EN:
iscsi_set_param(cls_conn, param, buf, buflen);
@@ -2071,12 +1774,12 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
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_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))
return -ENOMEM;
break;
@@ -2183,14 +1886,15 @@ iscsi_tcp_session_create(struct iscsi_transport *iscsit,
struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- ctask->hdr = &tcp_ctask->hdr;
+ ctask->hdr = &tcp_ctask->hdr.cmd_hdr;
+ ctask->hdr_max = sizeof(tcp_ctask->hdr) - ISCSI_DIGEST_SIZE;
}
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;
+ mtask->hdr = (struct iscsi_hdr *) &tcp_mtask->hdr;
}
if (iscsi_r2tpool_alloc(class_to_transport_session(cls_session)))
@@ -2222,12 +1926,14 @@ static struct scsi_host_template iscsi_sht = {
.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,
.use_clustering = DISABLE_CLUSTERING,
+ .use_sg_chaining = ENABLE_SG_CHAINING,
.slave_configure = iscsi_tcp_slave_configure,
.proc_name = "iscsi_tcp",
.this_id = -1,
@@ -2257,14 +1963,17 @@ static struct iscsi_transport iscsi_tcp_transport = {
ISCSI_PERSISTENT_ADDRESS |
ISCSI_TARGET_NAME | ISCSI_TPGT |
ISCSI_USERNAME | ISCSI_PASSWORD |
- ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN,
+ ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
+ ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
+ ISCSI_LU_RESET_TMO |
+ ISCSI_PING_TMO | ISCSI_RECV_TMO,
.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,
+ .max_cmd_len = 16,
/* session management */
.create_session = iscsi_tcp_session_create,
.destroy_session = iscsi_tcp_session_destroy,
@@ -2283,8 +1992,8 @@ static struct iscsi_transport iscsi_tcp_transport = {
/* 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,
+ .init_cmd_task = iscsi_tcp_ctask_init,
+ .init_mgmt_task = iscsi_tcp_mtask_init,
.xmit_cmd_task = iscsi_tcp_ctask_xmit,
.xmit_mgmt_task = iscsi_tcp_mtask_xmit,
.cleanup_cmd_task = iscsi_tcp_cleanup_ctask,