RDMA/bnxt_re: Fix setting mandatory attributes for modify_qp

Firmware expects "min_rnr_timer" as a mandatory attribute in
MODIFY_QP command during the RTR-RTS transition. This needs
to be enforced by the driver which is missing while setting
bnxt_set_mandatory_attributes that sends these flags as part
of modify_qp optimization.

Fixes: 82c32d2 ("RDMA/bnxt_re: Add support for optimized modify QP")
Reviewed-by: Rukhsana Ansari <rukhsana.ansari@broadcom.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Link: https://patch.msgid.link/20241211083931.968831-4-kalesh-anakkur.purayil@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/bnxt_re/qplib_fp.c

@@ -1285,7 +1285,8 @@ static void __filter_modify_flags(struct bnxt_qplib_qp *qp)
 	}
 }
 
-static void bnxt_set_mandatory_attributes(struct bnxt_qplib_qp *qp,
+static void bnxt_set_mandatory_attributes(struct bnxt_qplib_res *res,
+					  struct bnxt_qplib_qp *qp,
 					  struct cmdq_modify_qp *req)
 {
 	u32 mandatory_flags = 0;
@@ -1300,6 +1301,14 @@ static void bnxt_set_mandatory_attributes(struct bnxt_qplib_qp *qp,
 		mandatory_flags |= CMDQ_MODIFY_QP_MODIFY_MASK_PKEY;
 	}
 
+	if (_is_min_rnr_in_rtr_rts_mandatory(res->dattr->dev_cap_flags2) &&
+	    (qp->cur_qp_state == CMDQ_MODIFY_QP_NEW_STATE_RTR &&
+	     qp->state == CMDQ_MODIFY_QP_NEW_STATE_RTS)) {
+		if (qp->type == CMDQ_MODIFY_QP_QP_TYPE_RC)
+			mandatory_flags |=
+				CMDQ_MODIFY_QP_MODIFY_MASK_MIN_RNR_TIMER;
+	}
+
 	if (qp->type == CMDQ_MODIFY_QP_QP_TYPE_UD ||
 	    qp->type == CMDQ_MODIFY_QP_QP_TYPE_GSI)
 		mandatory_flags |= CMDQ_MODIFY_QP_MODIFY_MASK_QKEY;
@@ -1340,7 +1349,7 @@ int bnxt_qplib_modify_qp(struct bnxt_qplib_res *res, struct bnxt_qplib_qp *qp)
 		/* Set mandatory attributes for INIT -> RTR and RTR -> RTS transition */
 		if (_is_optimize_modify_qp_supported(res->dattr->dev_cap_flags2) &&
 		    is_optimized_state_transition(qp))
-			bnxt_set_mandatory_attributes(qp, &req);
+			bnxt_set_mandatory_attributes(res, qp, &req);
 	}
 	bmask = qp->modify_flags;
 	req.modify_mask = cpu_to_le32(qp->modify_flags);

drivers/infiniband/hw/bnxt_re/qplib_res.h

@@ -584,6 +584,11 @@ static inline bool _is_optimize_modify_qp_supported(u16 dev_cap_ext_flags2)
 	return dev_cap_ext_flags2 & CREQ_QUERY_FUNC_RESP_SB_OPTIMIZE_MODIFY_QP_SUPPORTED;
 }
 
+static inline bool _is_min_rnr_in_rtr_rts_mandatory(u16 dev_cap_ext_flags2)
+{
+	return !!(dev_cap_ext_flags2 & CREQ_QUERY_FUNC_RESP_SB_MIN_RNR_RTR_RTS_OPT_SUPPORTED);
+}
+
 static inline bool _is_cq_coalescing_supported(u16 dev_cap_ext_flags2)
 {
 	return dev_cap_ext_flags2 & CREQ_QUERY_FUNC_RESP_SB_CQ_COALESCING_SUPPORTED;

drivers/infiniband/hw/bnxt_re/roce_hsi.h

@@ -2215,6 +2215,7 @@ struct creq_query_func_resp_sb {
 	#define CREQ_QUERY_FUNC_RESP_SB_REQ_RETRANSMISSION_SUPPORT_IQM_MSN_TABLE   (0x2UL << 4)
 	#define CREQ_QUERY_FUNC_RESP_SB_REQ_RETRANSMISSION_SUPPORT_LAST	\
 			CREQ_QUERY_FUNC_RESP_SB_REQ_RETRANSMISSION_SUPPORT_IQM_MSN_TABLE
+	#define CREQ_QUERY_FUNC_RESP_SB_MIN_RNR_RTR_RTS_OPT_SUPPORTED            0x1000UL
 	__le16	max_xp_qp_size;
 	__le16	create_qp_batch_size;
 	__le16	destroy_qp_batch_size;