ofproto-dpif: Store the initial tunnel IP TOS values for later use.

When a packet arrives on an IP tunnel, store the TOS value for later
use.  This value will be used in a couple of future commits.

Signed-off-by: Justin Pettit <[email protected]>

ofproto/ofproto-dpif.c

@@ -303,6 +303,9 @@ struct initial_vals {
     * This member should be removed when the VLAN splinters feature is no
     * longer needed. */
     ovs_be16 vlan_tci;
+
+    /* If received on a tunnel, the IP TOS value of the tunnel. */
+    uint8_t tunnel_ip_tos;
 };
 
 static void action_xlate_ctx_init(struct action_xlate_ctx *,
@@ -3648,11 +3651,12 @@ drop_key_clear(struct dpif_backer *backer)
  * flow->vlan_tci correctly for the VLAN of the VLAN splinter port, and pushes
  * a VLAN header onto 'packet' (if it is nonnull).
  *
- * Optionally, if nonnull, sets 'initial_vals->vlan_tci' to the VLAN TCI
- * with which the packet was really received, that is, the actual VLAN
- * TCI extracted by odp_flow_key_to_flow().  (This differs from the
- * value returned in flow->vlan_tci only for packets received on VLAN
- * splinters.)
+ * Optionally, if 'initial_vals' is nonnull, sets 'initial_vals->vlan_tci'
+ * to the VLAN TCI with which the packet was really received, that is, the
+ * actual VLAN TCI extracted by odp_flow_key_to_flow().  (This differs from
+ * the value returned in flow->vlan_tci only for packets received on
+ * VLAN splinters.)  Also, if received on an IP tunnel, sets
+ * 'initial_vals->tunnel_ip_tos' to the tunnel's IP TOS.
  *
  * Similarly, this function also includes some logic to help with tunnels.  It
  * may modify 'flow' as necessary to make the tunneling implementation
@@ -3679,6 +3683,7 @@ ofproto_receive(const struct dpif_backer *backer, struct ofpbuf *packet,
 
     if (initial_vals) {
         initial_vals->vlan_tci = flow->vlan_tci;
+        initial_vals->tunnel_ip_tos = flow->tunnel.ip_tos;
     }
 
     if (odp_in_port) {
@@ -5421,6 +5426,7 @@ rule_dpif_execute(struct rule_dpif *rule, const struct flow *flow,
     rule_credit_stats(rule, &stats);
 
     initial_vals.vlan_tci = flow->vlan_tci;
+    initial_vals.tunnel_ip_tos = flow->tunnel.ip_tos;
     ofpbuf_use_stub(&odp_actions, odp_actions_stub, sizeof odp_actions_stub);
     action_xlate_ctx_init(&ctx, ofproto, flow, &initial_vals,
                           rule, stats.tcp_flags, packet);
@@ -6563,6 +6569,7 @@ action_xlate_ctx_init(struct action_xlate_ctx *ctx,
     memset(&ctx->flow.tunnel, 0, sizeof ctx->flow.tunnel);
     ctx->base_flow = ctx->flow;
     ctx->base_flow.vlan_tci = initial_vals->vlan_tci;
+    ctx->base_flow.tunnel.ip_tos = initial_vals->tunnel_ip_tos;
     ctx->flow.tunnel.tun_id = initial_tun_id;
     ctx->rule = rule;
     ctx->packet = packet;
@@ -6649,6 +6656,7 @@ xlate_actions(struct action_xlate_ctx *ctx,
         uint32_t local_odp_port;
 
         initial_vals.vlan_tci = ctx->base_flow.vlan_tci;
+        initial_vals.tunnel_ip_tos = ctx->base_flow.tunnel.ip_tos;
 
         add_sflow_action(ctx);
 
@@ -7411,6 +7419,7 @@ packet_out(struct ofproto *ofproto_, struct ofpbuf *packet,
     dpif_flow_stats_extract(flow, packet, time_msec(), &stats);
 
     initial_vals.vlan_tci = flow->vlan_tci;
+    initial_vals.tunnel_ip_tos = 0;
     action_xlate_ctx_init(&ctx, ofproto, flow, &initial_vals, NULL,
                           packet_get_tcp_flags(packet, flow), packet);
     ctx.resubmit_stats = &stats;
@@ -7713,6 +7722,7 @@ ofproto_unixctl_trace(struct unixctl_conn *conn, int argc, const char *argv[],
             }
 
             initial_vals.vlan_tci = flow.vlan_tci;
+            initial_vals.tunnel_ip_tos = flow.tunnel.ip_tos;
         }
 
         /* Generate a packet, if requested. */
@@ -7747,6 +7757,7 @@ ofproto_unixctl_trace(struct unixctl_conn *conn, int argc, const char *argv[],
         flow_extract(packet, priority, mark, NULL, in_port, &flow);
         flow.tunnel.tun_id = tun_id;
         initial_vals.vlan_tci = flow.vlan_tci;
+        initial_vals.tunnel_ip_tos = flow.tunnel.ip_tos;
     } else {
         unixctl_command_reply_error(conn, "Bad command syntax");
         goto exit;