Re: [PATCH iproute2-next 8/9] rdma: Add QP resource tracking information

+	mnl_attr_for_each_nested(nla_entry, nla_table) {
+		struct nlattr *nla_line[RDMA_NLDEV_ATTR_MAX] = {};
+		uint32_t lqpn, rqpn = 0, rq_psn = 0, sq_psn;
+		uint8_t type, state, path_mig_state = 0;
+		uint32_t port = 0, pid = 0;
+		bool ignore_value = false;
+		char port_name[32];
+		const char *comm;
+		int err;
+
+		err = mnl_attr_parse_nested(nla_entry, rd_attr_cb, nla_line);
+		if (err != MNL_CB_OK)
+			return -EINVAL;
+
+		if (!nla_line[RDMA_NLDEV_ATTR_RES_LQPN] ||
+		    !nla_line[RDMA_NLDEV_ATTR_RES_SQ_PSN] ||
+		    !nla_line[RDMA_NLDEV_ATTR_RES_TYPE] ||
+		    !nla_line[RDMA_NLDEV_ATTR_RES_STATE] ||
+		    !nla_line[RDMA_NLDEV_ATTR_RES_PID_COMM]) {
+			return -EINVAL;
+		}
+
+		if (nla_line[RDMA_NLDEV_ATTR_PORT_INDEX])
+			port = mnl_attr_get_u32(nla_line[RDMA_NLDEV_ATTR_PORT_INDEX]);
+
+		if (port != rd->port_idx)
+			continue;
+
+		if (nla_line[RDMA_NLDEV_ATTR_PORT_INDEX])
+			snprintf(port_name, 32, "%s/%u", name, port);
+		else
+			snprintf(port_name, 32, "%s/-", name);
+
+		lqpn = mnl_attr_get_u32(nla_line[RDMA_NLDEV_ATTR_RES_LQPN]);
+		if (rd_check_is_filtered(rd, "lqpn", lqpn, false))
+			continue;
+
+		if (nla_line[RDMA_NLDEV_ATTR_RES_RQPN])
+			rqpn = mnl_attr_get_u32(nla_line[RDMA_NLDEV_ATTR_RES_RQPN]);
+		else
+			ignore_value = true;
+
+		if (rd_check_is_filtered(rd, "rqpn", rqpn, ignore_value))
+			continue;
+
+		if (nla_line[RDMA_NLDEV_ATTR_RES_RQ_PSN])
+			rq_psn = mnl_attr_get_u32(nla_line[RDMA_NLDEV_ATTR_RES_RQ_PSN]);
+
+		sq_psn = mnl_attr_get_u32(nla_line[RDMA_NLDEV_ATTR_RES_SQ_PSN]);
+		if (nla_line[RDMA_NLDEV_ATTR_RES_PATH_MIG_STATE])
+			path_mig_state = mnl_attr_get_u8(nla_line[RDMA_NLDEV_ATTR_RES_PATH_MIG_STATE]);
+		type = mnl_attr_get_u8(nla_line[RDMA_NLDEV_ATTR_RES_TYPE]);
+		state = mnl_attr_get_u8(nla_line[RDMA_NLDEV_ATTR_RES_STATE]);
+
+		if (nla_line[RDMA_NLDEV_ATTR_RES_PID])
+			pid = mnl_attr_get_u32(nla_line[RDMA_NLDEV_ATTR_RES_PID]);
+
+		if (rd_check_is_filtered(rd, "pid", pid, false))
+			continue;
+
+		comm = mnl_attr_get_str(nla_line[RDMA_NLDEV_ATTR_RES_PID_COMM]);
+
+		if (rd->json_output) {
+			jsonw_start_array(rd->jw);
+			jsonw_uint_field(rd->jw, "ifindex", idx);
+			if (nla_line[RDMA_NLDEV_ATTR_PORT_INDEX])
+				jsonw_uint_field(rd->jw, "port", port);
+			jsonw_string_field(rd->jw, "ifname", port_name);
+			jsonw_uint_field(rd->jw, "lqpn", lqpn);
+			if (nla_line[RDMA_NLDEV_ATTR_RES_RQPN])
+				jsonw_uint_field(rd->jw, "rqpn", rqpn);
+			if (nla_line[RDMA_NLDEV_ATTR_RES_RQ_PSN])
+				jsonw_uint_field(rd->jw, "rq-psn", rq_psn);
+			if (nla_line[RDMA_NLDEV_ATTR_RES_SQ_PSN])
+				jsonw_uint_field(rd->jw, "sq-psn", sq_psn);
+			if (nla_line[RDMA_NLDEV_ATTR_RES_PATH_MIG_STATE])
+				jsonw_string_field(rd->jw, "path-mig-state",
+						   path_mig_to_str(path_mig_state));
+
+			jsonw_string_field(rd->jw, "type", qp_types_to_str(type));
+			jsonw_string_field(rd->jw, "state", qp_states_to_str(state));
+			if (nla_line[RDMA_NLDEV_ATTR_RES_PID])
+				jsonw_uint_field(rd->jw, "pid", pid);
+			jsonw_string_field(rd->jw, "comm", comm);
+			jsonw_end_array(rd->jw);

+		} else {
+			pr_out("%-10s", port_name);
+			for (cidx = 0; cidx < ARRAY_SIZE(c); cidx++)
+				if (show_column(rd, &c[cidx])) {
+					if (!strcmpx(c[cidx].filter_name, "lqpn"))
+						pr_out("%-11u", lqpn);
+					if (!strcmpx(c[cidx].filter_name, "rqpn")) {
+						if (nla_line[RDMA_NLDEV_ATTR_RES_RQPN])
+							pr_out("%-11u", rqpn);
+						else
+							pr_out("%-11s", "---");
+					}
+					if (!strcmpx(c[cidx].filter_name, "type"))
+						pr_out("%-6s", qp_types_to_str(type));
+					if (!strcmpx(c[cidx].filter_name, "state"))
+						pr_out("%-7s", qp_states_to_str(state));
+					if (!strcmpx(c[cidx].filter_name, "rq-psn")) {
+						if (nla_line[RDMA_NLDEV_ATTR_RES_RQ_PSN])
+							pr_out("%-11d", rq_psn);
+						else
+							pr_out("%-11s", "---");
+					}
+					if (!strcmpx(c[cidx].filter_name, "sq-psn"))
+						pr_out("%-11d", sq_psn);
+					if (!strcmpx(c[cidx].filter_name, "path-mig")) {
+						if (nla_line[RDMA_NLDEV_ATTR_RES_PATH_MIG_STATE])
+							pr_out("%-16s", path_mig_to_str(path_mig_state));
+						else
+							pr_out("%-16s", "---");
+					}
+					if (!strcmpx(c[cidx].filter_name, "pid"))
+						pr_out("%-11d", pid);
+					if (!strcmpx(c[cidx].filter_name, "comm")) {
+						if (nla_line[RDMA_NLDEV_ATTR_RES_PID]) {
+							pr_out("%-16s ", comm);
+						} else {
+							char tmp[18];
+
+							snprintf(tmp, sizeof(tmp), "[%s]", comm);
+							pr_out("%-16s", tmp);
+						}
+					}