This is a note to let you know that I've just added the patch titled
RDMA/bnxt_re: wraparound mbox producer index
to the 5.15-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:
rdma-bnxt_re-wraparound-mbox-producer-index.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 77f43524437c6b0d62674ff03e12a92aaba1550a
Author: Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>
Date: Fri Jun 9 04:01:38 2023 -0700
RDMA/bnxt_re: wraparound mbox producer index
[ Upstream commit 0af91306e17ef3d18e5f100aa58aa787869118af ]
Driver is not handling the wraparound of the mbox producer index correctly.
Currently the wraparound happens once u32 max is reached.
Bit 31 of the producer index register is special and should be set
only once for the first command. Because the producer index overflow
setting bit31 after a long time, FW goes to initialization sequence
and this causes FW hang.
Fix is to wraparound the mbox producer index once it reaches u16 max.
Fixes: cee0c7bba486 ("RDMA/bnxt_re: Refactor command queue management code")
Fixes: 1ac5a4047975 ("RDMA/bnxt_re: Add bnxt_re RoCE driver")
Signed-off-by: Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>
Signed-off-by: Selvin Xavier <selvin.xavier@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1686308514-11996-2-git-send-email-selvin.xavier@xxxxxxxxxxxx
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c
index d72f36d2bd496..abeee7cc7dc6d 100644
--- a/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c
+++ b/drivers/infiniband/hw/bnxt_re/qplib_rcfw.c
@@ -181,7 +181,7 @@ static int __send_message(struct bnxt_qplib_rcfw *rcfw, struct cmdq_base *req,
} while (size > 0);
cmdq->seq_num++;
- cmdq_prod = hwq->prod;
+ cmdq_prod = hwq->prod & 0xFFFF;
if (test_bit(FIRMWARE_FIRST_FLAG, &cmdq->flags)) {
/* The very first doorbell write
* is required to set this flag
@@ -599,7 +599,7 @@ int bnxt_qplib_alloc_rcfw_channel(struct bnxt_qplib_res *res,
rcfw->cmdq_depth = BNXT_QPLIB_CMDQE_MAX_CNT_8192;
sginfo.pgsize = bnxt_qplib_cmdqe_page_size(rcfw->cmdq_depth);
- hwq_attr.depth = rcfw->cmdq_depth;
+ hwq_attr.depth = rcfw->cmdq_depth & 0x7FFFFFFF;
hwq_attr.stride = BNXT_QPLIB_CMDQE_UNITS;
hwq_attr.type = HWQ_TYPE_CTX;
if (bnxt_qplib_alloc_init_hwq(&cmdq->hwq, &hwq_attr)) {
