IB/iser: Fix sg_tablesize calculation
authorMax Gurtovoy <maxg@mellanox.com>
Tue, 17 Jan 2017 22:40:39 +0000 (00:40 +0200)
committerDoug Ledford <dledford@redhat.com>
Tue, 24 Jan 2017 16:37:45 +0000 (11:37 -0500)
commit1e5db6c31ade4150c2e2b1a21e39f776c38fea39
treebadaf77660460ad816aec11c42dc6e96299819d2
parent0a475ef4226e305bdcffe12b401ca1eab06c4913
IB/iser: Fix sg_tablesize calculation

For devices that can register page list that is bigger than
USHRT_MAX, we actually take the wrong value for sg_tablesize.
E.g: for CX4 max_fast_reg_page_list_len is 65536 (bigger than USHRT_MAX)
so we set sg_tablesize to 0 by mistake. Therefore, each IO that is
bigger than 4k splitted to "< 4k" chunks that cause performance degredation.
Remove wrong sg_tablesize assignment, and use the value that was set during
address resolution handler with the needed casting.

Cc: <stable@vger.kernel.org> # v4.5+
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Doug Ledford <dledford@redhat.com>
drivers/infiniband/ulp/iser/iscsi_iser.c