diff options
| author | Vasu Dev <vasu.dev@intel.com> | 2009-02-27 21:56:27 +0300 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-03-10 17:09:21 +0300 |
| commit | c826a3145736e3baabebccfd0aecfbb6dae059f2 (patch) | |
| tree | 4c156c85a8eec039973b369cff052206da128cbe /include/scsi | |
| parent | e904158159e9812d06646767b7c81846dc3b05e6 (diff) | |
| download | linux-c826a3145736e3baabebccfd0aecfbb6dae059f2.tar.xz | |
[SCSI] fcoe: Out of order tx frames was causing several check condition SCSI status
frames followed by these errors in log.
[sdp] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
[sdp] Sense Key : Aborted Command [current]
[sdp] Add. Sense: Data phase error
This was causing some test apps to exit due to write failure under heavy
load.
This was due to a race around adding and removing tx frame skb in
fcoe_pending_queue, Chris Leech helped me to find that brief unlocking
period when pulling skb from fcoe_pending_queue in various contexts
(fcoe_watchdog and fcoe_xmit) and then adding skb back into fcoe_pending_queue
up on a failed fcoe_start_io could change skb/tx frame order in
fcoe_pending_queue. Thanks Chris.
This patch allows only single context to pull skb from fcoe_pending_queue
at any time to prevent above described ordering issue/race by use of
fcoe_pending_queue_active flag.
This patch simplified fcoe_watchdog with modified fcoe_check_wait_queue by
use of FCOE_LOW_QUEUE_DEPTH instead previously used several conditionals
to clear and set lp->qfull.
I think FCOE_MAX_QUEUE_DEPTH with FCOE_LOW_QUEUE_DEPTH will work better
in re/setting lp->qfull and these could be fine tuned for performance.
Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'include/scsi')
| -rw-r--r-- | include/scsi/libfcoe.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/scsi/libfcoe.h b/include/scsi/libfcoe.h index f43d3833a7a8..941818f29f59 100644 --- a/include/scsi/libfcoe.h +++ b/include/scsi/libfcoe.h @@ -46,6 +46,7 @@ struct fcoe_softc { struct net_device *phys_dev; /* device with ethtool_ops */ struct packet_type fcoe_packet_type; struct sk_buff_head fcoe_pending_queue; + u8 fcoe_pending_queue_active; u8 dest_addr[ETH_ALEN]; u8 ctl_src_addr[ETH_ALEN]; |