IB/iser: bound protection_sg size by data_sg size

In case we don't set the sg_prot_tablesize, the scsi layer assign the
default size (65535 entries). We should limit this size since we should
take into consideration the underlaying device capability. This cap is
considered when calculating the sg_tablesize. Otherwise, for example,
we can get that /sys/block/sdb/queue/max_segments is 128 and
/sys/block/sdb/queue/max_integrity_segments is 65535.

Link: https://lore.kernel.org/r/1569359027-10987-1-git-send-email-maxg@mellanox.com
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index 2e72fc5af15732db4f349917ffe6ad4fad946190..c4c015c604465505920602866703d083c2a03346 100644 (file)
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -646,6 +646,7 @@ iscsi_iser_session_create(struct iscsi_endpoint *ep,
                if (ib_conn->pi_support) {
                        u32 sig_caps = ib_dev->attrs.sig_prot_cap;
 
+                       shost->sg_prot_tablesize = shost->sg_tablesize;
                        scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
                        scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP |
                                                   SHOST_DIX_GUARD_CRC);