ipip: add GSO/TSO support

Now inet_gso_segment() is stackable, its relatively easy to
implement GSO/TSO support for IPIP

Performance results, when segmentation is done after tunnel
device (as no NIC is yet enabled for TSO IPIP support) :

Before patch :

lpq83:~# ./netperf -H 7.7.9.84 -Cc
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 7.7.9.84 () port 0 AF_INET
Recv   Send    Send                          Utilization       Service Demand
Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
Size   Size    Size     Time     Throughput  local    remote   local   remote
bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB   us/KB

 87380  16384  16384    10.00      3357.88   5.09     3.70     2.983   2.167

After patch :

lpq83:~# ./netperf -H 7.7.9.84 -Cc
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 7.7.9.84 () port 0 AF_INET
Recv   Send    Send                          Utilization       Service Demand
Socket Socket  Message  Elapsed              Send     Recv     Send    Recv
Size   Size    Size     Time     Throughput  local    remote   local   remote
bytes  bytes   bytes    secs.    10^6bits/s  % S      % S      us/KB   us/KB

 87380  16384  16384    10.00      7710.19   4.52     6.62     1.152   1.687

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netdev_features.h b/include/linux/netdev_features.h
index a2a89a5..8dad68c 100644 (file)
--- a/include/linux/netdev_features.h
+++ b/include/linux/netdev_features.h
@@ -42,6 +42,7 @@ enum {
        NETIF_F_TSO6_BIT,               /* ... TCPv6 segmentation */
        NETIF_F_FSO_BIT,                /* ... FCoE segmentation */
        NETIF_F_GSO_GRE_BIT,            /* ... GRE with TSO */
+       NETIF_F_GSO_IPIP_BIT,           /* ... IPIP tunnel with TSO */
        NETIF_F_GSO_UDP_TUNNEL_BIT,     /* ... UDP TUNNEL with TSO */
        NETIF_F_GSO_MPLS_BIT,           /* ... MPLS segmentation */
        /**/NETIF_F_GSO_LAST =          /* last bit, see GSO_MASK */
@@ -107,6 +108,7 @@ enum {
 #define NETIF_F_RXFCS          __NETIF_F(RXFCS)
 #define NETIF_F_RXALL          __NETIF_F(RXALL)
 #define NETIF_F_GSO_GRE                __NETIF_F(GSO_GRE)
+#define NETIF_F_GSO_IPIP       __NETIF_F(GSO_IPIP)
 #define NETIF_F_GSO_UDP_TUNNEL __NETIF_F(GSO_UDP_TUNNEL)
 #define NETIF_F_GSO_MPLS       __NETIF_F(GSO_MPLS)
 #define NETIF_F_HW_VLAN_STAG_FILTER __NETIF_F(HW_VLAN_STAG_FILTER)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index cad1e0c..6072913 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -318,9 +318,11 @@ enum {
 
        SKB_GSO_GRE = 1 << 6,
 
-       SKB_GSO_UDP_TUNNEL = 1 << 7,
+       SKB_GSO_IPIP = 1 << 7,
 
-       SKB_GSO_MPLS = 1 << 8,
+       SKB_GSO_UDP_TUNNEL = 1 << 8,
+
+       SKB_GSO_MPLS = 1 << 9,
 };
 
 #if BITS_PER_LONG > 32

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 78e9d92..8cab774 100644 (file)
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -81,6 +81,7 @@ static const char netdev_features_strings[NETDEV_FEATURE_COUNT][ETH_GSTRING_LEN]
        [NETIF_F_TSO6_BIT] =             "tx-tcp6-segmentation",
        [NETIF_F_FSO_BIT] =              "tx-fcoe-segmentation",
        [NETIF_F_GSO_GRE_BIT] =          "tx-gre-segmentation",
+       [NETIF_F_GSO_IPIP_BIT] =         "tx-ipip-segmentation",
        [NETIF_F_GSO_UDP_TUNNEL_BIT] =   "tx-udp_tnl-segmentation",
        [NETIF_F_GSO_MPLS_BIT] =         "tx-mpls-segmentation",
 

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 5783ab5..4049906 100644 (file)
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1291,6 +1291,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
                       SKB_GSO_DODGY |
                       SKB_GSO_TCP_ECN |
                       SKB_GSO_GRE |
+                      SKB_GSO_IPIP |
                       SKB_GSO_TCPV6 |
                       SKB_GSO_UDP_TUNNEL |
                       SKB_GSO_MPLS |
@@ -1656,6 +1657,13 @@ static struct packet_offload ip_packet_offload __read_mostly = {
        },
 };
 
+static const struct net_offload ipip_offload = {
+       .callbacks = {
+               .gso_send_check = inet_gso_send_check,
+               .gso_segment    = inet_gso_segment,
+       },
+};
+
 static int __init ipv4_offload_init(void)
 {
        /*
@@ -1667,6 +1675,7 @@ static int __init ipv4_offload_init(void)
                pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
 
        dev_add_offload(&ip_packet_offload);
+       inet_add_offload(&ipip_offload, IPPROTO_IPIP);
        return 0;
 }
 

diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index 55e6bfb..e5d4361 100644 (file)
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -39,7 +39,8 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
                                  SKB_GSO_UDP |
                                  SKB_GSO_DODGY |
                                  SKB_GSO_TCP_ECN |
-                                 SKB_GSO_GRE)))
+                                 SKB_GSO_GRE |
+                                 SKB_GSO_IPIP)))
                goto out;
 
        if (unlikely(!pskb_may_pull(skb, sizeof(*greh))))

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 7f80fb4..fe3e9f7 100644 (file)
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -220,17 +220,17 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
        if (unlikely(skb->protocol != htons(ETH_P_IP)))
                goto tx_error;
 
-       if (likely(!skb->encapsulation)) {
-               skb_reset_inner_headers(skb);
-               skb->encapsulation = 1;
-       }
+       skb = iptunnel_handle_offloads(skb, false, SKB_GSO_IPIP);
+       if (IS_ERR(skb))
+               goto out;
 
        ip_tunnel_xmit(skb, dev, tiph, tiph->protocol);
        return NETDEV_TX_OK;
 
 tx_error:
-       dev->stats.tx_errors++;
        dev_kfree_skb(skb);
+out:
+       dev->stats.tx_errors++;
        return NETDEV_TX_OK;
 }
 
@@ -275,6 +275,7 @@ static const struct net_device_ops ipip_netdev_ops = {
 #define IPIP_FEATURES (NETIF_F_SG |            \
                       NETIF_F_FRAGLIST |       \
                       NETIF_F_HIGHDMA |        \
+                      NETIF_F_GSO_SOFTWARE |   \
                       NETIF_F_HW_CSUM)
 
 static void ipip_tunnel_setup(struct net_device *dev)

diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c
index 8e3113f..dfc96b0 100644 (file)
--- a/net/ipv4/tcp_offload.c
+++ b/net/ipv4/tcp_offload.c
@@ -56,6 +56,7 @@ struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
                               SKB_GSO_TCP_ECN |
                               SKB_GSO_TCPV6 |
                               SKB_GSO_GRE |
+                              SKB_GSO_IPIP |
                               SKB_GSO_MPLS |
                               SKB_GSO_UDP_TUNNEL |
                               0) ||

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index f35ecca..83206de 100644 (file)
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -52,6 +52,7 @@ static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
 
                if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY |
                                      SKB_GSO_UDP_TUNNEL |
+                                     SKB_GSO_IPIP |
                                      SKB_GSO_GRE | SKB_GSO_MPLS) ||
                             !(type & (SKB_GSO_UDP))))
                        goto out;

diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index b405fba..5c2fc1d 100644 (file)
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -96,6 +96,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
                       SKB_GSO_DODGY |
                       SKB_GSO_TCP_ECN |
                       SKB_GSO_GRE |
+                      SKB_GSO_IPIP |
                       SKB_GSO_UDP_TUNNEL |
                       SKB_GSO_MPLS |
                       SKB_GSO_TCPV6 |

diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index 6055951..f63780f 100644 (file)
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -64,6 +64,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
                                      SKB_GSO_DODGY |
                                      SKB_GSO_UDP_TUNNEL |
                                      SKB_GSO_GRE |
+                                     SKB_GSO_IPIP |
                                      SKB_GSO_MPLS) ||
                             !(type & (SKB_GSO_UDP))))
                        goto out;

diff --git a/net/mpls/mpls_gso.c b/net/mpls/mpls_gso.c
index 1bec121..851cd88 100644 (file)
--- a/net/mpls/mpls_gso.c
+++ b/net/mpls/mpls_gso.c
@@ -33,6 +33,7 @@ static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
                                  SKB_GSO_DODGY |
                                  SKB_GSO_TCP_ECN |
                                  SKB_GSO_GRE |
+                                 SKB_GSO_IPIP |
                                  SKB_GSO_MPLS)))
                goto out;