diff mbox series

[for-rc,10/10] RDMA/bnxt_re: Fix the GID table length

Message ID 1728373302-19530-11-git-send-email-selvin.xavier@broadcom.com (mailing list archive)
State Accepted
Delegated to: Jason Gunthorpe
Headers show
Series RDMA/bnxt_re: Bug fixes | expand

Commit Message

Selvin Xavier Oct. 8, 2024, 7:41 a.m. UTC 
From: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>

GID table length is reported by FW. The gid index
which is passed to the driver during modify_qp/create_ah
is restricted by the sgid_index field of struct ib_global_route.
sgid_index is u8 and the max sgid possible is 256.

Each GID entry in HW will have 2 GID entries in the kernel gid table.
So we can support twice the gid table size reported by FW. Also, restrict
the max GID to 256 also.

Fixes: 847b97887ed4 ("RDMA/bnxt_re: Restrict the max_gids to 256")
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
---
 drivers/infiniband/hw/bnxt_re/qplib_sp.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/infiniband/hw/bnxt_re/qplib_sp.c b/drivers/infiniband/hw/bnxt_re/qplib_sp.c
index 32c1cc7..e29fbbd 100644
--- a/drivers/infiniband/hw/bnxt_re/qplib_sp.c
+++ b/drivers/infiniband/hw/bnxt_re/qplib_sp.c
@@ -159,7 +159,14 @@  int bnxt_qplib_get_dev_attr(struct bnxt_qplib_rcfw *rcfw,
 	if (!bnxt_qplib_is_chip_gen_p7(rcfw->res->cctx))
 		attr->l2_db_size = (sb->l2_db_space_size + 1) *
 				    (0x01 << RCFW_DBR_BASE_PAGE_SHIFT);
-	attr->max_sgid = BNXT_QPLIB_NUM_GIDS_SUPPORTED;
+	/*
+	 * Read the max gid supported by HW.
+	 * For each entry in HW  GID in HW table, we consume 2
+	 * GID entries in the kernel GID table.  So max_gid reported
+	 * to stack can be up to twice the value reported by the HW, up to 256 gids.
+	 */
+	attr->max_sgid = le32_to_cpu(sb->max_gid);
+	attr->max_sgid = min_t(u32, BNXT_QPLIB_NUM_GIDS_SUPPORTED, 2 * attr->max_sgid);
 	attr->dev_cap_flags = le16_to_cpu(sb->dev_cap_flags);
 	attr->dev_cap_flags2 = le16_to_cpu(sb->dev_cap_ext_flags_2);