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| author | Mike Christie <michaelc@cs.wisc.edu> | 2007-05-30 21:57:14 +0400 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.(none)> | 2007-06-01 20:57:17 +0400 |
| commit | d473cc7f15f64ab8a90c3d7288ef30f46785d8d5 (patch) | |
| tree | bef7d5c01842430fcd93f6a235ad404d1de1f5a3 /drivers/scsi/iscsi_tcp.c | |
| parent | 8ad5781ae9702a8f95cfdf30967752e4297613ee (diff) | |
| download | linux-d473cc7f15f64ab8a90c3d7288ef30f46785d8d5.tar.xz | |
[SCSI] iscsi: Some fixes in preparation for bidirectional support - exp_datasn
This patch fixes handling of expected datasn/r2tsn as received from
target. It is done according to: T10 rfc3720 section 3.2.2.3. Data Sequencing.
. unify expected datasn/r2tsn into one counter
. calculate than check expected datasn/r2tsn. On error print a message
and fail the request. (TODO use iscsi retransmits)
. remove the FIXME ;)
. avoid zero length memset
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/iscsi_tcp.c')
| -rw-r--r-- | drivers/scsi/iscsi_tcp.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index 8201e6c4d8a9..17fc79c408a2 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -229,10 +229,13 @@ iscsi_data_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) if (tcp_conn->in.datalen == 0) return 0; - if (ctask->datasn != datasn) + 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; + } - ctask->datasn++; + tcp_ctask->exp_datasn++; tcp_ctask->data_offset = be32_to_cpu(rhdr->offset); if (tcp_ctask->data_offset + tcp_conn->in.datalen > ctask->total_length) @@ -365,15 +368,16 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) return ISCSI_ERR_DATALEN; } - if (tcp_ctask->exp_r2tsn && tcp_ctask->exp_r2tsn != r2tsn) + 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; + } rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); if (rc) return rc; - /* FIXME: use R2TSN to detect missing R2T */ - /* fill-in new R2T associated with the task */ spin_lock(&session->lock); if (!ctask->sc || ctask->mtask || @@ -414,7 +418,7 @@ iscsi_r2t_rsp(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask) iscsi_solicit_data_init(conn, ctask, r2t); - tcp_ctask->exp_r2tsn = r2tsn + 1; + tcp_ctask->exp_datasn = r2tsn + 1; __kfifo_put(tcp_ctask->r2tqueue, (void*)&r2t, sizeof(void*)); tcp_ctask->xmstate |= XMSTATE_SOL_HDR; list_move_tail(&ctask->running, &conn->xmitqueue); @@ -1284,10 +1288,10 @@ iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask) tcp_ctask->sent = 0; tcp_ctask->sg_count = 0; + tcp_ctask->exp_datasn = 0; if (sc->sc_data_direction == DMA_TO_DEVICE) { tcp_ctask->xmstate = XMSTATE_W_HDR; - tcp_ctask->exp_r2tsn = 0; BUG_ON(ctask->total_length == 0); if (sc->use_sg) { |