netdev-offload-dpdk: Support offload of set MAC actions.

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

@@ -392,6 +392,7 @@ Supported actions for hardware offload are:
 
 - Output.
 - Drop.
+- Modification of Ethernet (mod_dl_src/mod_dl_dst).
 
 Further Reading
 ---------------

NEWS

@@ -34,7 +34,8 @@ 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 and drop actions (experimental).
+     * Add hardware offload support for output, drop and set MAC 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

@@ -369,6 +369,21 @@ dump_flow_action(struct ds *s, const struct rte_flow_action *actions)
         }
     } else if (actions->type == RTE_FLOW_ACTION_TYPE_DROP) {
         ds_put_cstr(s, "rte flow drop action\n");
+    } else if (actions->type == RTE_FLOW_ACTION_TYPE_SET_MAC_SRC ||
+               actions->type == RTE_FLOW_ACTION_TYPE_SET_MAC_DST) {
+        const struct rte_flow_action_set_mac *set_mac = actions->conf;
+
+        char *dirstr = actions->type == RTE_FLOW_ACTION_TYPE_SET_MAC_DST
+                       ? "dst" : "src";
+
+        ds_put_format(s, "rte flow set-mac-%s action:\n", dirstr);
+        if (set_mac) {
+            ds_put_format(s,
+                          "  Set-mac-%s: "ETH_ADDR_FMT"\n", dirstr,
+                          ETH_ADDR_BYTES_ARGS(set_mac->mac_addr));
+        } else {
+            ds_put_format(s, "  Set-mac-%s = null\n", dirstr);
+        }
     } else {
         ds_put_format(s, "unknown rte flow action (%d)\n", actions->type);
     }
@@ -797,6 +812,80 @@ add_output_action(struct netdev *netdev,
     return ret;
 }
 
+static int
+add_set_flow_action__(struct flow_actions *actions,
+                      const void *value, void *mask,
+                      const size_t size, const int attr)
+{
+    void *spec;
+
+    if (mask) {
+        /* DPDK does not support partially masked set actions. In such
+         * case, fail the offload.
+         */
+        if (is_all_zeros(mask, size)) {
+            return 0;
+        }
+        if (!is_all_ones(mask, size)) {
+            VLOG_DBG_RL(&rl, "Partial mask is not supported");
+            return -1;
+        }
+    }
+
+    spec = xzalloc(size);
+    memcpy(spec, value, size);
+    add_flow_action(actions, attr, spec);
+
+    /* Clear used mask for later checking. */
+    if (mask) {
+        memset(mask, 0, size);
+    }
+    return 0;
+}
+
+BUILD_ASSERT_DECL(sizeof(struct rte_flow_action_set_mac) ==
+                  MEMBER_SIZEOF(struct ovs_key_ethernet, eth_src));
+BUILD_ASSERT_DECL(sizeof(struct rte_flow_action_set_mac) ==
+                  MEMBER_SIZEOF(struct ovs_key_ethernet, eth_dst));
+
+static int
+parse_set_actions(struct flow_actions *actions,
+                  const struct nlattr *set_actions,
+                  const size_t set_actions_len,
+                  bool masked)
+{
+    const struct nlattr *sa;
+    unsigned int sleft;
+
+#define add_set_flow_action(field, type)                                      \
+    if (add_set_flow_action__(actions, &key->field,                           \
+                              mask ? CONST_CAST(void *, &mask->field) : NULL, \
+                              sizeof key->field, type)) {                     \
+        return -1;                                                            \
+    }
+
+    NL_ATTR_FOR_EACH_UNSAFE (sa, sleft, set_actions, set_actions_len) {
+        if (nl_attr_type(sa) == OVS_KEY_ATTR_ETHERNET) {
+            const struct ovs_key_ethernet *key = nl_attr_get(sa);
+            const struct ovs_key_ethernet *mask = masked ? key + 1 : NULL;
+
+            add_set_flow_action(eth_src, RTE_FLOW_ACTION_TYPE_SET_MAC_SRC);
+            add_set_flow_action(eth_dst, RTE_FLOW_ACTION_TYPE_SET_MAC_DST);
+
+            if (mask && !is_all_zeros(mask, sizeof *mask)) {
+                VLOG_DBG_RL(&rl, "Unsupported ETHERNET set action");
+                return -1;
+            }
+        } else {
+            VLOG_DBG_RL(&rl,
+                        "Unsupported set action type %d", nl_attr_type(sa));
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
 static int
 parse_flow_actions(struct netdev *netdev,
                    struct flow_actions *actions,
@@ -815,6 +904,16 @@ parse_flow_actions(struct netdev *netdev,
             }
         } else if (nl_attr_type(nla) == OVS_ACTION_ATTR_DROP) {
             add_flow_action(actions, RTE_FLOW_ACTION_TYPE_DROP, NULL);
+        } else if (nl_attr_type(nla) == OVS_ACTION_ATTR_SET ||
+                   nl_attr_type(nla) == OVS_ACTION_ATTR_SET_MASKED) {
+            const struct nlattr *set_actions = nl_attr_get(nla);
+            const size_t set_actions_len = nl_attr_get_size(nla);
+            bool masked = nl_attr_type(nla) == OVS_ACTION_ATTR_SET_MASKED;
+
+            if (parse_set_actions(actions, set_actions, set_actions_len,
+                                  masked)) {
+                return -1;
+            }
         } else {
             VLOG_DBG_RL(&rl, "Unsupported action type %d", nl_attr_type(nla));
             return -1;