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RDMA/iser: Limit sgs to the device fastreg depth 

Currently the sg tablesize, which dictates fast register page list
depth to use, does not take into account the limits of the rdma device.
So adjust it once we discover the device fastreg max depth limit.  Also
adjust the max_sectors based on the resulting sg tablesize.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Steve Wise 2015-07-28 09:13:52 -05:00 committed by Doug Ledford
parent d6c7276be1
commit 7854550ae6
1 changed files with 9 additions and 0 deletions
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drivers/infiniband/ulp/iser/iscsi_iser.c
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@ -640,6 +640,15 @@ iscsi_iser_session_create(struct iscsi_endpoint *ep,
SHOST_DIX_GUARD_CRC); SHOST_DIX_GUARD_CRC);
} }
/*
* Limit the sg_tablesize and max_sectors based on the device
* max fastreg page list length.
*/
shost->sg_tablesize = min_t(unsigned short, shost->sg_tablesize,
ib_conn->device->dev_attr.max_fast_reg_page_list_len);
shost->max_sectors = min_t(unsigned int,
1024, (shost->sg_tablesize * PAGE_SIZE) >> 9);
if (iscsi_host_add(shost, if (iscsi_host_add(shost,
ib_conn->device->ib_device->dma_device)) { ib_conn->device->ib_device->dma_device)) {
mutex_unlock(&iser_conn->state_mutex); mutex_unlock(&iser_conn->state_mutex);