port: do not unplug static ports

If some port is available since grout startup, don't try to remove the
underlying device. This is to accommodate with buses that do not properly
implement device hotplug.

Signed-off-by: David Marchand <[email protected]>

Author: david-marchand

modules/infra/control/gr_port.h

@@ -33,6 +33,7 @@ struct __rte_aligned(alignof(void *)) iface_info_port {
 
 	uint16_t port_id;
 	bool started;
+	bool hotplugged;
 	struct rte_mempool *pool;
 	char *devargs;
 	uint32_t pool_size;

modules/infra/control/port.c

@@ -307,15 +307,11 @@ static int iface_port_fini(struct iface *iface) {
 		LOG(ERR, "rte_eth_dev_info_get: %s", rte_strerror(-ret));
 	if ((ret = rte_eth_dev_stop(port->port_id)) < 0)
 		LOG(ERR, "rte_eth_dev_stop: %s", rte_strerror(-ret));
-	// XXX DPDK bus/fslmc VFIO constraint for dpaa2
-	if (strcmp(info.driver_name, "net_dpaa2") == 0)
-		goto fini;
 	if ((ret = rte_eth_dev_close(port->port_id)) < 0)
 		LOG(ERR, "rte_eth_dev_close: %s", rte_strerror(-ret));
-	if (info.device != NULL && (ret = rte_dev_remove(info.device)) < 0)
+	if (port->hotplugged && info.device != NULL && (ret = rte_dev_remove(info.device)) < 0)
 		LOG(ERR, "rte_dev_remove: %s", rte_strerror(-ret));
 
-fini:
 	if (port->pool != NULL) {
 		gr_pktmbuf_pool_release(port->pool, port->pool_size);
 		port->pool = NULL;
@@ -331,6 +327,7 @@ static int iface_port_init(struct iface *iface, const void *api_info) {
 	const struct gr_iface_info_port *api = api_info;
 	uint16_t port_id = RTE_MAX_ETHPORTS;
 	struct rte_dev_iterator iterator;
+	bool hotplugged = false;
 	const struct iface *i;
 	struct gr_iface conf;
 	int ret;
@@ -352,6 +349,7 @@ static int iface_port_init(struct iface *iface, const void *api_info) {
 			return errno_set(-ret);
 		RTE_ETH_FOREACH_MATCHING_DEV(port_id, api->devargs, &iterator) {
 			rte_eth_iterator_cleanup(&iterator);
+			hotplugged = true;
 			break;
 		}
 	}
@@ -360,6 +358,7 @@ static int iface_port_init(struct iface *iface, const void *api_info) {
 		return errno_set(EIDRM);
 
 	port->port_id = port_id;
+	port->hotplugged = hotplugged;
 	port->devargs = strndup(api->devargs, GR_PORT_DEVARGS_SIZE);
 	if (port->devargs == NULL) {
 		ret = errno_set(ENOMEM);