svcrdma: Remove BH-disabled spin locking in svc_rdma_send()

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svcrdma's current SQ accounting algorithm takes sc_lock and disables
bottom-halves while posting all RDMA Read, Write, and Send WRs.

This is relatively heavyweight serialization. And note that Write and
Send are already fully serialized by the xpt_mutex.

Using a single atomic_t should be all that is necessary to guarantee
that ib_post_send() is called only when there is enough space on the
send queue. This is what the other RDMA-enabled storage targets do.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

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Chuck Lever 2016-11-29 11:04:50 -05:00 • committed by J. Bruce Fields

parent 5fdca65314

commit e4eb42cecc

3 changed files with 17 additions and 17 deletions

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2

include/linux/sunrpc/svc_rdma.h

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7

net/sunrpc/xprtrdma/svc_rdma_sendto.c

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25

net/sunrpc/xprtrdma/svc_rdma_transport.c

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