This is a note to let you know that I've just added the patch titled
RDMA/bnxt_re: Add send queue size check for variable wqe
to the 6.12-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-add-send-queue-size-check-for-variable-.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 150d8ff68abc0a7ab10d1cdef46db1abd7f93c5a
Author: Damodharam Ammepalli <damodharam.ammepalli@xxxxxxxxxxxx>
Date: Tue Dec 17 15:56:47 2024 +0530
RDMA/bnxt_re: Add send queue size check for variable wqe
[ Upstream commit d13be54dc18baee7a3e44349b80755a8c8205d3f ]
For the fixed WQE case, HW supports 0xFFFF WQEs.
For variable Size WQEs, HW treats this number as
the 16 bytes slots. The maximum supported WQEs
needs to be adjusted based on the number of slots.
Set a maximum WQE limit for variable WQE scenario.
Fixes: de1d364c3815 ("RDMA/bnxt_re: Add support for Variable WQE in Genp7 adapters")
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@xxxxxxxxxxxx>
Signed-off-by: Damodharam Ammepalli <damodharam.ammepalli@xxxxxxxxxxxx>
Signed-off-by: Selvin Xavier <selvin.xavier@xxxxxxxxxxxx>
Link: https://patch.msgid.link/20241217102649.1377704-4-kalesh-anakkur.purayil@xxxxxxxxxxxx
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/infiniband/hw/bnxt_re/qplib_sp.c b/drivers/infiniband/hw/bnxt_re/qplib_sp.c
index b273db59454e..3cca7b1395f6 100644
--- a/drivers/infiniband/hw/bnxt_re/qplib_sp.c
+++ b/drivers/infiniband/hw/bnxt_re/qplib_sp.c
@@ -138,6 +138,10 @@ int bnxt_qplib_get_dev_attr(struct bnxt_qplib_rcfw *rcfw,
attr->max_qp_wqes -= BNXT_QPLIB_RESERVED_QP_WRS + 1;
}
+ /* Adjust for max_qp_wqes for variable wqe */
+ if (cctx->modes.wqe_mode == BNXT_QPLIB_WQE_MODE_VARIABLE)
+ attr->max_qp_wqes = BNXT_VAR_MAX_WQE - 1;
+
attr->max_qp_sges = cctx->modes.wqe_mode == BNXT_QPLIB_WQE_MODE_VARIABLE ?
min_t(u32, sb->max_sge_var_wqe, BNXT_VAR_MAX_SGE) : 6;
attr->max_cq = le32_to_cpu(sb->max_cq);
