RDMA/bnxt_re: use shadow qd while posting non blocking rcfw command

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[ Upstream commit 65288a22dd ]

Whenever there is a fast path IO and create/destroy resources from
the slow path is happening in parallel, we may notice high latency
of slow path command completion.

Introduces a shadow queue depth to prevent the outstanding requests
to the FW. Driver will not allow more than #RCFW_CMD_NON_BLOCKING_SHADOW_QD
non-blocking commands to the Firmware.

Shadow queue depth is a soft limit only for non-blocking
commands. Blocking commands will be posted to the firmware
as long as there is a free slot.

Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://lore.kernel.org/r/1686308514-11996-8-git-send-email-selvin.xavier@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Stable-dep-of: 29900bf351 ("RDMA/bnxt_re: Fix hang during driver unload")
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Kashyap Desai 2023-06-09 04:01:44 -07:00 • committed by Greg Kroah-Hartman

parent 4e5c10167e

commit e0777f9c32

2 changed files with 61 additions and 2 deletions

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60

drivers/infiniband/hw/bnxt_re/qplib_rcfw.c

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3

drivers/infiniband/hw/bnxt_re/qplib_rcfw.h

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