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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/net/rds/rdma_transport.c
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@@ -43,6 +43,9 @@
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 static struct rdma_cm_id *rds6_rdma_listen_id;
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 #endif
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+/* Per IB specification 7.7.3, service level is a 4-bit field. */
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+#define TOS_TO_SL(tos)		((tos) & 0xF)
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+
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 static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id,
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 					 struct rdma_cm_event *event,
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 					 bool isv6)
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@@ -51,6 +54,8 @@
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 	struct rds_connection *conn = cm_id->context;
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 	struct rds_transport *trans;
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 	int ret = 0;
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+	int *err;
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+	u8 len;
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 	rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
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 		 event->event, rdma_event_msg(event->event));
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@@ -81,6 +86,7 @@
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 		break;
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 	case RDMA_CM_EVENT_ADDR_RESOLVED:
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+		rdma_set_service_type(cm_id, conn->c_tos);
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 		/* XXX do we need to clean up if this fails? */
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 		ret = rdma_resolve_route(cm_id,
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 					 RDS_RDMA_RESOLVE_TIMEOUT_MS);
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@@ -94,21 +100,39 @@
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 			struct rds_ib_connection *ibic;
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 			ibic = conn->c_transport_data;
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-			if (ibic && ibic->i_cm_id == cm_id)
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+			if (ibic && ibic->i_cm_id == cm_id) {
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+				cm_id->route.path_rec[0].sl =
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+					TOS_TO_SL(conn->c_tos);
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 				ret = trans->cm_initiate_connect(cm_id, isv6);
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-			else
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+			} else {
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 				rds_conn_drop(conn);
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+			}
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 		}
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 		break;
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 	case RDMA_CM_EVENT_ESTABLISHED:
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-		trans->cm_connect_complete(conn, event);
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+		if (conn)
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+			trans->cm_connect_complete(conn, event);
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 		break;
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 	case RDMA_CM_EVENT_REJECTED:
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+		if (!conn)
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+			break;
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+		err = (int *)rdma_consumer_reject_data(cm_id, event, &len);
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+		if (!err ||
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+		    (err && len >= sizeof(*err) &&
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+		     ((*err) <= RDS_RDMA_REJ_INCOMPAT))) {
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+			pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n",
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+				&conn->c_laddr, &conn->c_faddr);
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+
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+			if (!conn->c_tos)
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+				conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION;
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+
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+			rds_conn_drop(conn);
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+		}
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 		rdsdebug("Connection rejected: %s\n",
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 			 rdma_reject_msg(cm_id, event->status));
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-		/* FALLTHROUGH */
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+		break;
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 	case RDMA_CM_EVENT_ADDR_ERROR:
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 	case RDMA_CM_EVENT_ROUTE_ERROR:
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 	case RDMA_CM_EVENT_CONNECT_ERROR:
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@@ -120,6 +144,8 @@
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 		break;
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 	case RDMA_CM_EVENT_DISCONNECTED:
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+		if (!conn)
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+			break;
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 		rdsdebug("DISCONNECT event - dropping connection "
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 			 "%pI6c->%pI6c\n", &conn->c_laddr,
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 			 &conn->c_faddr);