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IB/srp: Prevent mapping failures

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If both max_sectors and the queue_depth are high enough it can
happen that the MR pool is depleted temporarily. This causes
the SRP initiator to report mapping failures. Although the SRP
initiator recovers from such mapping failures, prevent that
this can happen by allocating more memory regions.

Additionally, only enable memory registration if at least two
pages can be registered per memory region.

Reported-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Tested-by: Laurence Oberman <loberman@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche
2016-05-12 10:50:35 -07:00
committed by Doug Ledford
parent 835ee624c9
commit 509c5f33f4
2 changed files with 119 additions and 19 deletions
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1
drivers/infiniband/ulp/srp/ib_srp.h
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@@ -203,6 +203,7 @@ struct srp_target_port {
unsigned int scsi_id;
unsigned int sg_tablesize;
int mr_pool_size;
int mr_per_cmd;
int queue_size;
int req_ring_size;
int comp_vector;