netlink-socket: Reduce nl_sock_recv() from 2 (or more) system calls to 1.

[sliver-openvswitch.git] / datapath / datapath.c

diff --git a/datapath/datapath.c b/datapath/datapath.c
index e2846f2..d149344 100644 (file)
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -53,6 +53,11 @@
 #include "vlan.h"
 #include "vport-internal_dev.h"
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) || \
+    LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
+#error Kernels before 2.6.18 or after 3.0 are not supported by this version of Open vSwitch.
+#endif
+
 int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
 EXPORT_SYMBOL(dp_ioctl_hook);
 
@@ -284,7 +289,7 @@ void dp_process_received_packet(struct vport *p, struct sk_buff *skb)
                }
 
                if (is_frag && dp->drop_frags) {
-                       kfree_skb(skb);
+                       consume_skb(skb);
                        stats_counter_off = offsetof(struct dp_stats_percpu, n_frags);
                        goto out;
                }
@@ -394,23 +399,20 @@ int dp_upcall(struct datapath *dp, struct sk_buff *skb, const struct dp_upcall_i
 
        WARN_ON_ONCE(skb_shared(skb));
 
-       forward_ip_summed(skb);
-
-       err = vswitch_skb_checksum_setup(skb);
-       if (err)
-               goto err_kfree_skb;
+       forward_ip_summed(skb, true);
 
        /* Break apart GSO packets into their component pieces.  Otherwise
         * userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
        if (skb_is_gso(skb)) {
                struct sk_buff *nskb = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
                
-               kfree_skb(skb);
-               skb = nskb;
-               if (IS_ERR(skb)) {
-                       err = PTR_ERR(skb);
+               if (IS_ERR(nskb)) {
+                       kfree_skb(skb);
+                       err = PTR_ERR(nskb);
                        goto err;
                }
+               consume_skb(skb);
+               skb = nskb;
        }
 
        err = queue_control_packets(dp, skb, upcall_info);
@@ -419,8 +421,6 @@ int dp_upcall(struct datapath *dp, struct sk_buff *skb, const struct dp_upcall_i
 
        return 0;
 
-err_kfree_skb:
-       kfree_skb(skb);
 err:
        local_bh_disable();
        stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
@@ -507,7 +507,7 @@ static int queue_control_packets(struct datapath *dp, struct sk_buff *skb,
                if (err)
                        goto err_kfree_skbs;
 
-               kfree_skb(skb);
+               consume_skb(skb);
                skb = nskb;
        } while (skb);
        return 0;