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| author | Yi Zou <yi.zou@intel.com> | 2012-01-13 17:26:15 -0800 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-01-16 12:44:28 +0400 |
| commit | a762dce41cb5742a143f6aa2d80ee1aac7e1f5eb (patch) | |
| tree | 173bd7ca3d621f073d8a8ed887c39c7c0dd926f3 /drivers/scsi/fcoe | |
| parent | 19b628dfc60eda4459b65e4b6b7a748932d28929 (diff) | |
| download | linux-a762dce41cb5742a143f6aa2d80ee1aac7e1f5eb.tar.bz2 | |
[SCSI] fcoe: fix regression on offload em matching function for initiator/target
This is a regression introduced by commit
1ff9918b625457ce20d450d00f9ed0a12ba191b7 The else statement here is breaking
the initiator logic of allocating xid from the offloaded em xid pool for READ
I/O only to use DDP, as shown by the snippet of trace below, where the WRITE
is using xid 0x5 from the offloaded em xid pool:
Protocol VID Len S_ID D_ID OX_ID RX_ID Summary
..
*FCP 228 96 0b.08.01 -> 01.0f.00 0x0005 0xffff SCSI: Write(10) LUN: 0x00
FCP 228 76 01.0f.00 -> 0b.08.01 0x0005 0x828d XFER_RDY
...
The bug is in the else statement, for both initiator and target, the
new command will have FC frame header bit 23 (FC_FC_EX_CTX) cleared as it was
originated from the initiator. Also, this is assuming the frame header is
already filled up, which is only true for target since for initiator, this is a
new frame and oem_match gets called when em tries get xid for this i/o before
it is filled up and sent out.
The fix is to check if there is a fc_fcp_pkt associated w/ this frame from
fr_fsp(fp), since fr_fsp(fp) is NULL for tcm_fc target and non-I/O frame in
initiator. This should also return true for target only if it is an
FC_RCTL_DD_UNSOL_CMD and rx_id is not allocated.
Signed-off-by: Yi Zou <yi.zou@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/fcoe')
| -rw-r--r-- | drivers/scsi/fcoe/fcoe.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c index e535f95e4772..507504b77880 100644 --- a/drivers/scsi/fcoe/fcoe.c +++ b/drivers/scsi/fcoe/fcoe.c @@ -756,11 +756,12 @@ bool fcoe_oem_match(struct fc_frame *fp) if (fc_fcp_is_read(fr_fsp(fp)) && (fr_fsp(fp)->data_len > fcoe_ddp_min)) return true; - else if (!(ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)) { + else if ((fr_fsp(fp) == NULL) && + (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) && + (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) { fcp = fc_frame_payload_get(fp, sizeof(*fcp)); - if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN && - fcp && (ntohl(fcp->fc_dl) > fcoe_ddp_min) && - (fcp->fc_flags & FCP_CFL_WRDATA)) + if ((fcp->fc_flags & FCP_CFL_WRDATA) && + (ntohl(fcp->fc_dl) > fcoe_ddp_min)) return true; } return false; |