This is a note to let you know that I've just added the patch titled
IB/iser: Fix sg_tablesize calculation
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ib-iser-fix-sg_tablesize-calculation.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1e5db6c31ade4150c2e2b1a21e39f776c38fea39 Mon Sep 17 00:00:00 2001
From: Max Gurtovoy <maxg@xxxxxxxxxxxx>
Date: Wed, 18 Jan 2017 00:40:39 +0200
Subject: IB/iser: Fix sg_tablesize calculation
From: Max Gurtovoy <maxg@xxxxxxxxxxxx>
commit 1e5db6c31ade4150c2e2b1a21e39f776c38fea39 upstream.
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.
Signed-off-by: Max Gurtovoy <maxg@xxxxxxxxxxxx>
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/ulp/iser/iscsi_iser.c | 7 -------
1 file changed, 7 deletions(-)
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -651,13 +651,6 @@ iscsi_iser_session_create(struct iscsi_e
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);
Patches currently in stable-queue which might be from maxg@xxxxxxxxxxxx are
queue-4.9/ib-srp-fix-mr-allocation-when-the-device-supports-sg-gaps.patch
queue-4.9/ib-srp-fix-invalid-indirect_sg_entries-parameter-value.patch
queue-4.9/ib-iser-fix-sg_tablesize-calculation.patch
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