add an API ff_regist_packet_dispatcher_context that allows to pass more context to callback

Author: jinliu777

lib/ff_api.h

@@ -219,9 +219,48 @@ int ff_route_ctl(enum FF_ROUTE_CTL req, enum FF_ROUTE_FLAG flag,
 typedef int (*dispatch_func_t)(void *data, uint16_t *len,
     uint16_t queue_id, uint16_t nb_queues);
 
+/*
+ * Packet dispatcher context structure.
+ * Contains additional context information for packet dispatching.
+ */
+struct ff_dispatcher_context {
+  struct {
+      uint8_t stripped;
+      uint16_t vlan_tci;  /**< Priority (3) + CFI (1) + Identifier Code (12) */
+  } vlan;
+};
+
+/*
+ * Enhanced packet dispatch callback function with context.
+ * Implemented by user.
+ *
+ * @param data
+ *   The data pointer of this packet.
+ * @param len
+ *   The length of this packet.
+ * @param queue_id
+ *   Current queue of this packet.
+ * @param nb_queues
+ *   Number of queues to be dispatched.
+ * @param context
+ *   Additional context information for packet dispatching.
+ *
+ * @return 0 to (nb_queues - 1)
+ *   The queue id that the packet will be dispatched to.
+ * @return FF_DISPATCH_ERROR (-1)
+ *   Error occurs or packet is handled by user, packet will be freed.
+ * @return FF_DISPATCH_RESPONSE (-2)
+ *   Packet is handled by user, packet will be responsed.
+ */
+typedef int (*dispatch_func_context_t)(void *data, uint16_t *len,
+    uint16_t queue_id, uint16_t nb_queues, struct ff_dispatcher_context context);
+
 /* regist a packet dispath function */
 void ff_regist_packet_dispatcher(dispatch_func_t func);
 
+/* Register a packet dispatch function with context support */
+void ff_regist_packet_dispatcher_context(dispatch_func_context_t func);
+
 /*
  * RAW packet send direty with DPDK by user APP.
  *

lib/ff_dpdk_if.c

@@ -125,6 +125,7 @@ static pcblddr_func_t pcblddr_fun;
 
 static struct rte_ring **dispatch_ring[RTE_MAX_ETHPORTS];
 static dispatch_func_t packet_dispatcher;
+static dispatch_func_context_t packet_dispatcher_with_context;
 
 static uint16_t rss_reta_size[RTE_MAX_ETHPORTS];
 
@@ -1614,10 +1615,27 @@ process_packets(uint16_t port_id, uint16_t queue_id, struct rte_mbuf **bufs,
             ff_traffic.rx_bytes += rte_pktmbuf_pkt_len(rtem);
         }
 
-        if (!pkts_from_ring && packet_dispatcher) {
-            uint64_t cur_tsc = rte_rdtsc();
-            int ret = (*packet_dispatcher)(data, &len, queue_id, nb_queues);
-            usr_cb_tsc += rte_rdtsc() - cur_tsc;
+        if (!pkts_from_ring && (packet_dispatcher || packet_dispatcher_with_context)) {
+            uint64_t cur_tsc;
+            int ret;
+            if (packet_dispatcher) {
+                cur_tsc = rte_rdtsc();
+                ret = (*packet_dispatcher)(data, &len, queue_id, nb_queues);
+                usr_cb_tsc += rte_rdtsc() - cur_tsc;
+            } else if (packet_dispatcher_with_context) {
+                struct ff_dispatcher_context ctx;
+                if (rtem->ol_flags & RTE_MBUF_F_RX_VLAN_STRIPPED) {
+                    ctx.vlan.stripped = 1;
+                    ctx.vlan.vlan_tci = rte_cpu_to_be_16(rtem->vlan_tci);
+                } else {
+                   ctx.vlan.stripped = 0;
+                   ctx.vlan.vlan_tci = 0;
+                }
+                cur_tsc = rte_rdtsc();
+                ret = (*packet_dispatcher_with_context)(data, &len, queue_id, nb_queues, ctx);
+                usr_cb_tsc += rte_rdtsc() - cur_tsc;
+            }
+
             if (ret == FF_DISPATCH_RESPONSE) {
                 rte_pktmbuf_pkt_len(rtem) = rte_pktmbuf_data_len(rtem) = len;
                 /*
@@ -2772,6 +2790,12 @@ ff_regist_packet_dispatcher(dispatch_func_t func)
     packet_dispatcher = func;
 }
 
+void
+ff_regist_packet_dispatcher_context(dispatch_func_context_t func)
+{
+    packet_dispatcher_with_context = func;
+}
+
 uint64_t
 ff_get_tsc_ns()
 {