dpif: Save added ports in a port map for netdev flow api use

To use netdev flow offloading api, dpifs needs to iterate over
added ports. This addition inserts the added dpif ports in a hash map,
The map will also be used to translate dpif ports to netdevs.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Acked-by: Flavio Leitner <fbl@sysclose.org>
Signed-off-by: Simon Horman <simon.horman@netronome.com>

lib/dpif.c

@@ -355,7 +355,28 @@ do_open(const char *name, const char *type, bool create, struct dpif **dpifp)
     error = registered_class->dpif_class->open(registered_class->dpif_class,
                                                name, create, &dpif);
     if (!error) {
+        struct dpif_port_dump port_dump;
+        struct dpif_port dpif_port;
+
         ovs_assert(dpif->dpif_class == registered_class->dpif_class);
+
+        DPIF_PORT_FOR_EACH(&dpif_port, &port_dump, dpif) {
+            struct netdev *netdev;
+            int err;
+
+            if (!strcmp(dpif_port.type, "internal")) {
+                continue;
+            }
+
+            err = netdev_open(dpif_port.name, dpif_port.type, &netdev);
+
+            if (!err) {
+                netdev_ports_insert(netdev, DPIF_HMAP_KEY(dpif), &dpif_port);
+                netdev_close(netdev);
+            } else {
+                VLOG_WARN("could not open netdev %s type %s", name, type);
+            }
+        }
     } else {
         dp_class_unref(registered_class);
     }
@@ -548,6 +569,15 @@ dpif_port_add(struct dpif *dpif, struct netdev *netdev, odp_port_t *port_nop)
     if (!error) {
         VLOG_DBG_RL(&dpmsg_rl, "%s: added %s as port %"PRIu32,
                     dpif_name(dpif), netdev_name, port_no);
+
+        if (strcmp(netdev_get_type(netdev), "internal")) {
+            struct dpif_port dpif_port;
+
+            dpif_port.type = CONST_CAST(char *, netdev_get_type(netdev));
+            dpif_port.name = CONST_CAST(char *, netdev_name);
+            dpif_port.port_no = port_no;
+            netdev_ports_insert(netdev, DPIF_HMAP_KEY(dpif), &dpif_port);
+        }
     } else {
         VLOG_WARN_RL(&error_rl, "%s: failed to add %s as port: %s",
                      dpif_name(dpif), netdev_name, ovs_strerror(error));
@@ -572,6 +602,8 @@ dpif_port_del(struct dpif *dpif, odp_port_t port_no)
     if (!error) {
         VLOG_DBG_RL(&dpmsg_rl, "%s: port_del(%"PRIu32")",
                     dpif_name(dpif), port_no);
+
+        netdev_ports_remove(port_no, DPIF_HMAP_KEY(dpif));
     } else {
         log_operation(dpif, "port_del", error);
     }

lib/dpif.h

@@ -401,6 +401,8 @@
 extern "C" {
 #endif
 
+#define DPIF_HMAP_KEY(x) ((x)->dpif_class)
+
 struct dpif;
 struct dpif_class;
 struct dpif_flow;

lib/netdev.c

@@ -2127,6 +2127,138 @@ netdev_is_flow_api_enabled(void)
     return netdev_flow_api_enabled;
 }
 
+/* Protects below port hashmaps. */
+static struct ovs_mutex netdev_hmap_mutex = OVS_MUTEX_INITIALIZER;
+
+static struct hmap port_to_netdev OVS_GUARDED_BY(netdev_hmap_mutex)
+    = HMAP_INITIALIZER(&port_to_netdev);
+static struct hmap ifindex_to_port OVS_GUARDED_BY(netdev_hmap_mutex)
+    = HMAP_INITIALIZER(&ifindex_to_port);
+
+struct port_to_netdev_data {
+    struct hmap_node node;
+    struct netdev *netdev;
+    struct dpif_port dpif_port;
+    const void *obj;
+};
+
+struct ifindex_to_port_data {
+    struct hmap_node node;
+    int ifindex;
+    odp_port_t port;
+};
+
+static struct port_to_netdev_data *
+netdev_ports_lookup(odp_port_t port_no, const void *obj)
+    OVS_REQUIRES(netdev_hmap_mutex)
+{
+    size_t hash = hash_int(odp_to_u32(port_no), hash_pointer(obj, 0));
+    struct port_to_netdev_data *data;
+
+    HMAP_FOR_EACH_WITH_HASH(data, node, hash, &port_to_netdev) {
+            if (data->obj == obj && data->dpif_port.port_no == port_no) {
+                return data;
+            }
+    }
+    return NULL;
+}
+
+int
+netdev_ports_insert(struct netdev *netdev, const void *obj,
+                    struct dpif_port *dpif_port)
+{
+    size_t hash = hash_int(odp_to_u32(dpif_port->port_no),
+                           hash_pointer(obj, 0));
+    struct port_to_netdev_data *data;
+    struct ifindex_to_port_data *ifidx;
+    int ifindex = netdev_get_ifindex(netdev);
+
+    if (ifindex < 0) {
+        return ENODEV;
+    }
+
+    data = xzalloc(sizeof *data);
+    ifidx = xzalloc(sizeof *ifidx);
+
+    ovs_mutex_lock(&netdev_hmap_mutex);
+    if (netdev_ports_lookup(dpif_port->port_no, obj)) {
+        ovs_mutex_unlock(&netdev_hmap_mutex);
+        return EEXIST;
+    }
+
+    data->netdev = netdev_ref(netdev);
+    data->obj = obj;
+    dpif_port_clone(&data->dpif_port, dpif_port);
+
+    ifidx->ifindex = ifindex;
+    ifidx->port = dpif_port->port_no;
+
+    hmap_insert(&port_to_netdev, &data->node, hash);
+    hmap_insert(&ifindex_to_port, &ifidx->node, ifidx->ifindex);
+    ovs_mutex_unlock(&netdev_hmap_mutex);
+
+    netdev_init_flow_api(netdev);
+
+    return 0;
+}
+
+struct netdev *
+netdev_ports_get(odp_port_t port_no, const void *obj)
+{
+    struct port_to_netdev_data *data;
+    struct netdev *ret = NULL;
+
+    ovs_mutex_lock(&netdev_hmap_mutex);
+    data = netdev_ports_lookup(port_no, obj);
+    if (data) {
+        ret = netdev_ref(data->netdev);
+    }
+    ovs_mutex_unlock(&netdev_hmap_mutex);
+
+    return ret;
+}
+
+int
+netdev_ports_remove(odp_port_t port_no, const void *obj)
+{
+    struct port_to_netdev_data *data;
+    int ret = ENOENT;
+
+    ovs_mutex_lock(&netdev_hmap_mutex);
+
+    data = netdev_ports_lookup(port_no, obj);
+
+    if (data) {
+        dpif_port_destroy(&data->dpif_port);
+        netdev_close(data->netdev); /* unref and possibly close */
+        hmap_remove(&port_to_netdev, &data->node);
+        free(data);
+        ret = 0;
+    }
+
+    ovs_mutex_unlock(&netdev_hmap_mutex);
+
+    return ret;
+}
+
+odp_port_t
+netdev_ifindex_to_odp_port(int ifindex)
+{
+    struct ifindex_to_port_data *data;
+    odp_port_t ret = 0;
+
+    ovs_mutex_lock(&netdev_hmap_mutex);
+    HMAP_FOR_EACH_WITH_HASH(data, node, ifindex, &ifindex_to_port) {
+            if (data->ifindex == ifindex) {
+                ret = data->port;
+                break;
+            }
+    }
+    ovs_mutex_unlock(&netdev_hmap_mutex);
+
+    return ret;
+}
+
 #ifdef __linux__
 void
 netdev_set_flow_api_enabled(const struct smap *ovs_other_config)

lib/netdev.h

@@ -182,6 +182,12 @@ int netdev_init_flow_api(struct netdev *);
 bool netdev_is_flow_api_enabled(void);
 void netdev_set_flow_api_enabled(const struct smap *ovs_other_config);
 
+struct dpif_port;
+int netdev_ports_insert(struct netdev *, const void *obj, struct dpif_port *);
+struct netdev *netdev_ports_get(odp_port_t port, const void *obj);
+int netdev_ports_remove(odp_port_t port, const void *obj);
+odp_port_t netdev_ifindex_to_odp_port(int ifindex);
+
 /* native tunnel APIs */
 /* Structure to pass parameters required to build a tunnel header. */
 struct netdev_tnl_build_header_params {