netdev-offload-dpdk: Support offload of output action.

Support offload of output action, also configuring count action for
allowing query statistics of HW offloaded flows.

Signed-off-by: Eli Britstein <elibr@mellanox.com>
Reviewed-by: Oz Shlomo <ozsh@mellanox.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

Documentation/howto/dpdk.rst

@@ -370,19 +370,28 @@ The flow hardware offload is disabled by default and can be enabled by::
 
     $ ovs-vsctl set Open_vSwitch . other_config:hw-offload=true
 
-So far only partial flow offload is implemented. Moreover, it only works
-with PMD drivers have the rte_flow action "MARK + RSS" support.
+Matches and actions are programmed into HW to achieve full offload of
+the flow. If not all actions are supported, fallback to partial flow
+offload (offloading matches only). Moreover, it only works with PMD
+drivers that support the configured rte_flow actions.
+Partial flow offload requires support of "MARK + RSS" actions. Full
+hardware offload requires support of the actions listed below.
 
 The validated NICs are:
 
 - Mellanox (ConnectX-4, ConnectX-4 Lx, ConnectX-5)
 - Napatech (NT200B01)
 
-Supported protocols for hardware offload are:
+Supported protocols for hardware offload matches are:
+
 - L2: Ethernet, VLAN
-- L3: IPv4, IPv6
+- L3: IPv4
 - L4: TCP, UDP, SCTP, ICMP
 
+Supported actions for hardware offload are:
+
+- Output.
+
 Further Reading
 ---------------
 

NEWS

@@ -34,6 +34,7 @@ Post-v2.12.0
        interval is increased to 60 seconds for the connection to the
        replication server. This value is configurable with the unixctl
        command - ovsdb-server/set-active-ovsdb-server-probe-interval.
+     * Add hardware offload support for output actions (experimental).
    - 'ovs-appctl dpctl/dump-flows' can now show offloaded=partial for
      partially offloaded flows, dp:dpdk for fully offloaded by dpdk, and
      type filter supports new filters: "dpdk" and "partially-offloaded".

lib/netdev-offload-dpdk.c

@@ -347,6 +347,26 @@ dump_flow_action(struct ds *s, const struct rte_flow_action *actions)
         } else {
             ds_put_cstr(s, "  RSS = null\n");
         }
+    } else if (actions->type == RTE_FLOW_ACTION_TYPE_COUNT) {
+        const struct rte_flow_action_count *count = actions->conf;
+
+        ds_put_cstr(s, "rte flow count action:\n");
+        if (count) {
+            ds_put_format(s, "  Count: shared=%d, id=%d\n", count->shared,
+                          count->id);
+        } else {
+            ds_put_cstr(s, "  Count = null\n");
+        }
+    } else if (actions->type == RTE_FLOW_ACTION_TYPE_PORT_ID) {
+        const struct rte_flow_action_port_id *port_id = actions->conf;
+
+        ds_put_cstr(s, "rte flow port-id action:\n");
+        if (port_id) {
+            ds_put_format(s, "  Port-id: original=%d, id=%d\n",
+                          port_id->original, port_id->id);
+        } else {
+            ds_put_cstr(s, "  Port-id = null\n");
+        }
     } else {
         ds_put_format(s, "unknown rte flow action (%d)\n", actions->type);
     }
@@ -724,19 +744,77 @@ netdev_offload_dpdk_mark_rss(struct flow_patterns *patterns,
     return flow;
 }
 
+static void
+add_count_action(struct flow_actions *actions)
+{
+    struct rte_flow_action_count *count = xzalloc(sizeof *count);
+
+    add_flow_action(actions, RTE_FLOW_ACTION_TYPE_COUNT, count);
+}
+
 static int
-parse_flow_actions(struct netdev *netdev OVS_UNUSED,
+add_port_id_action(struct flow_actions *actions,
+                   struct netdev *outdev)
+{
+    struct rte_flow_action_port_id *port_id;
+    int outdev_id;
+
+    outdev_id = netdev_dpdk_get_port_id(outdev);
+    if (outdev_id < 0) {
+        return -1;
+    }
+    port_id = xzalloc(sizeof *port_id);
+    port_id->id = outdev_id;
+    add_flow_action(actions, RTE_FLOW_ACTION_TYPE_PORT_ID, port_id);
+    return 0;
+}
+
+static int
+add_output_action(struct netdev *netdev,
+                  struct flow_actions *actions,
+                  const struct nlattr *nla,
+                  struct offload_info *info)
+{
+    struct netdev *outdev;
+    odp_port_t port;
+    int ret = 0;
+
+    port = nl_attr_get_odp_port(nla);
+    outdev = netdev_ports_get(port, info->dpif_class);
+    if (outdev == NULL) {
+        VLOG_DBG_RL(&rl, "Cannot find netdev for odp port %"PRIu32, port);
+        return -1;
+    }
+    if (!netdev_flow_api_equals(netdev, outdev) ||
+        add_port_id_action(actions, outdev)) {
+        VLOG_DBG_RL(&rl, "%s: Output to port \'%s\' cannot be offloaded.",
+                    netdev_get_name(netdev), netdev_get_name(outdev));
+        ret = -1;
+    }
+    netdev_close(outdev);
+    return ret;
+}
+
+static int
+parse_flow_actions(struct netdev *netdev,
                    struct flow_actions *actions,
                    struct nlattr *nl_actions,
                    size_t nl_actions_len,
-                   struct offload_info *info OVS_UNUSED)
+                   struct offload_info *info)
 {
     struct nlattr *nla;
     size_t left;
 
+    add_count_action(actions);
     NL_ATTR_FOR_EACH_UNSAFE (nla, left, nl_actions, nl_actions_len) {
-        VLOG_DBG_RL(&rl, "Unsupported action type %d", nl_attr_type(nla));
-        return -1;
+        if (nl_attr_type(nla) == OVS_ACTION_ATTR_OUTPUT) {
+            if (add_output_action(netdev, actions, nla, info)) {
+                return -1;
+            }
+        } else {
+            VLOG_DBG_RL(&rl, "Unsupported action type %d", nl_attr_type(nla));
+            return -1;
+        }
     }
 
     if (nl_actions_len == 0) {