IB/srp: Reduce number of BUSY conditions

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As proposed by the SRP (draft) standard, ib_srp reserves one ring
element for SRP_TSK_MGMT requests. This patch makes sure that the SCSI
mid-layer never tries to queue more than (SRP request limit) - 1 SCSI
commands to ib_srp. This improves performance for targets whose request
limit is less than or equal to SRP_NORMAL_REQ_SQ_SIZE by reducing the
number of BUSY responses reported by ib_srp to the SCSI mid-layer.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: David Dillow <dillowda@ornl.gov>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

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Bart Van Assche 2010-08-30 19:27:36 +00:00 • committed by Roland Dreier

parent 05a1d7504f

commit 7ade400aba

1 changed files with 7 additions and 2 deletions

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drivers/infiniband/ulp/srp/ib_srp.c

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