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@xxxxxxxxxxxxxxx> # v4.5+
Signed-off-by: Max Gurtovoy <maxg@xxxxxxxxxxxx>
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
---
Changes since v2:
- remove "Fixes" statement
Changes since v1:
- update "Fixes" statement
- use sg_tablesize assignment from iser_calc_scsi_params()
- add patch 2/2 to remove unneeded variable
---
drivers/infiniband/ulp/iser/iscsi_iser.c | 7 -------
1 files changed, 0 insertions(+), 7 deletions(-)
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
index 9104e6b..1c91187 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -651,13 +651,6 @@ static void iscsi_iser_cleanup_task(struct iscsi_task *task)
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->ib_device->attrs.max_fast_reg_page_list_len);
-
if (iscsi_host_add(shost,
ib_conn->device->ib_device->dma_device)) {
mutex_unlock(&iser_conn->state_mutex);
--
1.7.1
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