datapath: Don't update flow key when applying actions.

Currently the flow key is updated to match an action that is applied
to a packet but these field are never looked at again.  Not only is
this a waste of time it also makes optimizations involving caching
the flow key more difficult.

diff --git a/datapath/actions.c b/datapath/actions.c
index d0b74d4..1a6cc35 100644 (file)
--- a/datapath/actions.c
+++ b/datapath/actions.c
@@ -70,19 +70,18 @@ static struct sk_buff *vlan_pull_tag(struct sk_buff *skb)
 }
 
 static struct sk_buff *modify_vlan_tci(struct datapath *dp, struct sk_buff *skb,
-                                      struct odp_flow_key *key, const union odp_action *a,
-                                      int n_actions, gfp_t gfp)
+                                      const struct odp_flow_key *key,
+                                      const union odp_action *a, int n_actions,
+                                      gfp_t gfp)
 {
        u16 tci, mask;
 
        if (a->type == ODPAT_SET_VLAN_VID) {
                tci = ntohs(a->vlan_vid.vlan_vid);
                mask = VLAN_VID_MASK;
-               key->dl_vlan = a->vlan_vid.vlan_vid;
        } else {
                tci = a->vlan_pcp.vlan_pcp << VLAN_PCP_SHIFT;
                mask = VLAN_PCP_MASK;
-               key->dl_vlan_pcp = a->vlan_pcp.vlan_pcp;
        }
 
        skb = make_writable(skb, VLAN_HLEN, gfp);
@@ -153,9 +152,8 @@ static struct sk_buff *modify_vlan_tci(struct datapath *dp, struct sk_buff *skb,
                                segs = __vlan_put_tag(segs, tci);
                                err = -ENOMEM;
                                if (segs) {
-                                       struct odp_flow_key segkey = *key;
                                        err = execute_actions(dp, segs,
-                                                             &segkey, a + 1,
+                                                             key, a + 1,
                                                              n_actions - 1,
                                                              gfp);
                                }
@@ -195,32 +193,26 @@ static struct sk_buff *modify_vlan_tci(struct datapath *dp, struct sk_buff *skb,
        return skb;
 }
 
-static struct sk_buff *strip_vlan(struct sk_buff *skb,
-                                 struct odp_flow_key *key, gfp_t gfp)
+static struct sk_buff *strip_vlan(struct sk_buff *skb, gfp_t gfp)
 {
        skb = make_writable(skb, 0, gfp);
-       if (skb) {
+       if (skb)
                vlan_pull_tag(skb);
-               key->dl_vlan = htons(ODP_VLAN_NONE);
-       }
+
        return skb;
 }
 
 static struct sk_buff *set_dl_addr(struct sk_buff *skb,
-                                  struct odp_flow_key *key,
                                   const struct odp_action_dl_addr *a,
                                   gfp_t gfp)
 {
        skb = make_writable(skb, 0, gfp);
        if (skb) {
                struct ethhdr *eh = eth_hdr(skb);
-               if (a->type == ODPAT_SET_DL_SRC) {
+               if (a->type == ODPAT_SET_DL_SRC)
                        memcpy(eh->h_source, a->dl_addr, ETH_ALEN);
-                       memcpy(key->dl_src, a->dl_addr, ETH_ALEN);
-               } else {
+               else
                        memcpy(eh->h_dest, a->dl_addr, ETH_ALEN);
-                       memcpy(key->dl_dst, a->dl_addr, ETH_ALEN);
-               }
        }
        return skb;
 }
@@ -246,7 +238,7 @@ static void update_csum(__sum16 *sum, struct sk_buff *skb,
 }
 
 static struct sk_buff *set_nw_addr(struct sk_buff *skb,
-                                  struct odp_flow_key *key,
+                                  const struct odp_flow_key *key,
                                   const struct odp_action_nw_addr *a,
                                   gfp_t gfp)
 {
@@ -269,17 +261,12 @@ static struct sk_buff *set_nw_addr(struct sk_buff *skb,
                }
                update_csum(&nh->check, skb, old, new, 0);
                *f = new;
-
-               if (a->type == ODPAT_SET_NW_SRC)
-                       key->nw_src = a->nw_addr;
-               else
-                       key->nw_dst = a->nw_addr;
        }
        return skb;
 }
 
 static struct sk_buff *set_nw_tos(struct sk_buff *skb,
-                                  struct odp_flow_key *key,
+                                  const struct odp_flow_key *key,
                                   const struct odp_action_nw_tos *a,
                                   gfp_t gfp)
 {
@@ -298,12 +285,12 @@ static struct sk_buff *set_nw_tos(struct sk_buff *skb,
                update_csum(&nh->check, skb, htons((uint16_t)old),
                                htons((uint16_t)new), 0);
                *f = new;
-               key->nw_tos = a->nw_tos;
        }
        return skb;
 }
 
-static struct sk_buff *set_tp_port(struct sk_buff *skb, struct odp_flow_key *key,
+static struct sk_buff *set_tp_port(struct sk_buff *skb,
+                                  const struct odp_flow_key *key,
                                   const struct odp_action_tp_port *a, gfp_t gfp)
 {
        int check_ofs;
@@ -327,10 +314,6 @@ static struct sk_buff *set_tp_port(struct sk_buff *skb, struct odp_flow_key *key
                update_csum((u16*)(skb_transport_header(skb) + check_ofs), 
                                skb, old, new, 0);
                *f = new;
-               if (a->type == ODPAT_SET_TP_SRC)
-                       key->tp_src = a->tp_port;
-               else
-                       key->tp_dst = a->tp_port;
        }
        return skb;
 }
@@ -412,7 +395,7 @@ static void sflow_sample(struct datapath *dp, struct sk_buff *skb,
 
 /* Execute a list of actions against 'skb'. */
 int execute_actions(struct datapath *dp, struct sk_buff *skb,
-                   struct odp_flow_key *key,
+                   const struct odp_flow_key *key,
                    const union odp_action *a, int n_actions,
                    gfp_t gfp)
 {
@@ -462,7 +445,7 @@ int execute_actions(struct datapath *dp, struct sk_buff *skb,
                        break;
 
                case ODPAT_SET_TUNNEL:
-                       OVS_CB(skb)->tun_id = key->tun_id = a->tunnel.tun_id;
+                       OVS_CB(skb)->tun_id = a->tunnel.tun_id;
                        break;
 
                case ODPAT_SET_VLAN_VID:
@@ -473,12 +456,12 @@ int execute_actions(struct datapath *dp, struct sk_buff *skb,
                        break;
 
                case ODPAT_STRIP_VLAN:
-                       skb = strip_vlan(skb, key, gfp);
+                       skb = strip_vlan(skb, gfp);
                        break;
 
                case ODPAT_SET_DL_SRC:
                case ODPAT_SET_DL_DST:
-                       skb = set_dl_addr(skb, key, &a->dl_addr, gfp);
+                       skb = set_dl_addr(skb, &a->dl_addr, gfp);
                        break;
 
                case ODPAT_SET_NW_SRC:

diff --git a/datapath/actions.h b/datapath/actions.h
index 09e35bd..e4fc397 100644 (file)
--- a/datapath/actions.h
+++ b/datapath/actions.h
@@ -18,7 +18,7 @@ struct odp_flow_key;
 union odp_action;
 
 int execute_actions(struct datapath *dp, struct sk_buff *skb,
-                   struct odp_flow_key *key,
+                   const struct odp_flow_key *key,
                    const union odp_action *, int n_actions,
                    gfp_t gfp);
 

diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index 5021874..fa47d39 100644 (file)
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -138,7 +138,7 @@ static int do_del_port(struct dp_netdev *, uint16_t port_no);
 static int dp_netdev_output_control(struct dp_netdev *, const struct ofpbuf *,
                                     int queue_no, int port_no, uint32_t arg);
 static int dp_netdev_execute_actions(struct dp_netdev *,
-                                     struct ofpbuf *, flow_t *,
+                                     struct ofpbuf *, const flow_t *,
                                      const union odp_action *, int n);
 
 static struct dpif_netdev *
@@ -1094,7 +1094,7 @@ dp_netdev_wait(void)
  * bits outside of 'mask'.
  */
 static void
-dp_netdev_modify_vlan_tci(struct ofpbuf *packet, flow_t *key,
+dp_netdev_modify_vlan_tci(struct ofpbuf *packet, const flow_t *key,
                           uint16_t tci, uint16_t mask)
 {
     struct vlan_eth_header *veh;
@@ -1118,12 +1118,10 @@ dp_netdev_modify_vlan_tci(struct ofpbuf *packet, flow_t *key,
         memcpy(veh, &tmp, sizeof tmp);
         packet->l2 = (char*)packet->l2 - VLAN_HEADER_LEN;
     }
-
-    key->dl_vlan = veh->veth_tci & htons(VLAN_VID_MASK);
 }
 
 static void
-dp_netdev_strip_vlan(struct ofpbuf *packet, flow_t *key)
+dp_netdev_strip_vlan(struct ofpbuf *packet)
 {
     struct vlan_eth_header *veh = packet->l2;
     if (veh->veth_type == htons(ETH_TYPE_VLAN)) {
@@ -1137,31 +1135,25 @@ dp_netdev_strip_vlan(struct ofpbuf *packet, flow_t *key)
         packet->data = (char*)packet->data + VLAN_HEADER_LEN;
         packet->l2 = (char*)packet->l2 + VLAN_HEADER_LEN;
         memcpy(packet->data, &tmp, sizeof tmp);
-
-        key->dl_vlan = htons(ODP_VLAN_NONE);
     }
 }
 
 static void
-dp_netdev_set_dl_src(struct ofpbuf *packet, flow_t *key,
-                     const uint8_t dl_addr[ETH_ADDR_LEN])
+dp_netdev_set_dl_src(struct ofpbuf *packet, const uint8_t dl_addr[ETH_ADDR_LEN])
 {
     struct eth_header *eh = packet->l2;
     memcpy(eh->eth_src, dl_addr, sizeof eh->eth_src);
-    memcpy(key->dl_src, dl_addr, sizeof key->dl_src);
 }
 
 static void
-dp_netdev_set_dl_dst(struct ofpbuf *packet, flow_t *key,
-                     const uint8_t dl_addr[ETH_ADDR_LEN])
+dp_netdev_set_dl_dst(struct ofpbuf *packet, const uint8_t dl_addr[ETH_ADDR_LEN])
 {
     struct eth_header *eh = packet->l2;
     memcpy(eh->eth_dst, dl_addr, sizeof eh->eth_dst);
-    memcpy(key->dl_dst, dl_addr, sizeof key->dl_dst);
 }
 
 static void
-dp_netdev_set_nw_addr(struct ofpbuf *packet, flow_t *key,
+dp_netdev_set_nw_addr(struct ofpbuf *packet, const flow_t *key,
                       const struct odp_action_nw_addr *a)
 {
     if (key->dl_type == htons(ETH_TYPE_IP)) {
@@ -1183,17 +1175,11 @@ dp_netdev_set_nw_addr(struct ofpbuf *packet, flow_t *key,
         }
         nh->ip_csum = recalc_csum32(nh->ip_csum, *field, a->nw_addr);
         *field = a->nw_addr;
-
-        if (a->type == ODPAT_SET_NW_SRC) {
-            key->nw_src = a->type;
-        } else {
-            key->nw_dst = a->type;
-        }
     }
 }
 
 static void
-dp_netdev_set_nw_tos(struct ofpbuf *packet, flow_t *key,
+dp_netdev_set_nw_tos(struct ofpbuf *packet, const flow_t *key,
                      const struct odp_action_nw_tos *a)
 {
     if (key->dl_type == htons(ETH_TYPE_IP)) {
@@ -1206,12 +1192,11 @@ dp_netdev_set_nw_tos(struct ofpbuf *packet, flow_t *key,
         nh->ip_csum = recalc_csum16(nh->ip_csum, htons((uint16_t)*field),
                 htons((uint16_t)a->nw_tos));
         *field = new;
-        key->nw_tos = a->nw_tos;
     }
 }
 
 static void
-dp_netdev_set_tp_port(struct ofpbuf *packet, flow_t *key,
+dp_netdev_set_tp_port(struct ofpbuf *packet, const flow_t *key,
                       const struct odp_action_tp_port *a)
 {
        if (key->dl_type == htons(ETH_TYPE_IP)) {
@@ -1229,12 +1214,6 @@ dp_netdev_set_tp_port(struct ofpbuf *packet, flow_t *key,
         } else {
             return;
         }
-
-        if (a->type == ODPAT_SET_TP_SRC) {
-            key->tp_src = a->tp_port;
-        } else {
-            key->tp_dst = a->tp_port;
-        }
     }
 }
 
@@ -1293,7 +1272,7 @@ dp_netdev_output_control(struct dp_netdev *dp, const struct ofpbuf *packet,
 
 static int
 dp_netdev_execute_actions(struct dp_netdev *dp,
-                          struct ofpbuf *packet, flow_t *key,
+                          struct ofpbuf *packet, const flow_t *key,
                           const union odp_action *actions, int n_actions)
 {
     int i;
@@ -1327,15 +1306,15 @@ dp_netdev_execute_actions(struct dp_netdev *dp,
             break;
 
                case ODPAT_STRIP_VLAN:
-                       dp_netdev_strip_vlan(packet, key);
+                       dp_netdev_strip_vlan(packet);
                        break;
 
                case ODPAT_SET_DL_SRC:
-            dp_netdev_set_dl_src(packet, key, a->dl_addr.dl_addr);
+            dp_netdev_set_dl_src(packet, a->dl_addr.dl_addr);
                        break;
 
                case ODPAT_SET_DL_DST:
-            dp_netdev_set_dl_dst(packet, key, a->dl_addr.dl_addr);
+            dp_netdev_set_dl_dst(packet, a->dl_addr.dl_addr);
                        break;
 
                case ODPAT_SET_NW_SRC: