RDMA/bnxt_re: Add send queue size check for variable wqe

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: de1d364 ("RDMA/bnxt_re: Add support for Variable WQE in Genp7 adapters")
Reviewed-by: Kalesh AP <[email protected]>
Signed-off-by: Damodharam Ammepalli <[email protected]>
Signed-off-by: Selvin Xavier <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Leon Romanovsky <[email protected]>

Author: damodhar-ai

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);