From: Kalesh AP <kalesh-anakkur.purayil@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Selvin Xavier <selvin.xavier@xxxxxxxxxxxx>
---
drivers/infiniband/hw/bnxt_re/qplib_sp.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
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);
--
2.5.5
