[NET]: Add ECN support for TSO

In the current TSO implementation, NETIF_F_TSO and ECN cannot be
turned on together in a TCP connection.  The problem is that most
hardware that supports TSO does not handle CWR correctly if it is set
in the TSO packet.  Correct handling requires CWR to be set in the
first packet only if it is set in the TSO header.

This patch adds the ability to turn on NETIF_F_TSO and ECN using
GSO if necessary to handle TSO packets with CWR set.  Hardware
that handles CWR correctly can turn on NETIF_F_TSO_ECN in the dev->
features flag.

All TSO packets with CWR set will have the SKB_GSO_TCPV4_ECN set.  If
the output device does not have the NETIF_F_TSO_ECN feature set, GSO
will split the packet up correctly with CWR only set in the first
segment.

With help from Herbert Xu <herbert@gondor.apana.org.au>.

Since ECN can always be enabled with TSO, the SOCK_NO_LARGESEND sock
flag is completely removed.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 9 insertions, 4 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index efd1e2af0bf3..aa2d3c12c4d8 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -316,6 +316,7 @@ struct net_device
 #define NETIF_F_TSO             (SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)
 #define NETIF_F_UFO             (SKB_GSO_UDPV4 << NETIF_F_GSO_SHIFT)
 #define NETIF_F_GSO_ROBUST      (SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
+#define NETIF_F_TSO_ECN         (SKB_GSO_TCPV4_ECN << NETIF_F_GSO_SHIFT)
 
 #define NETIF_F_GEN_CSUM        (NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
 #define NETIF_F_ALL_CSUM        (NETIF_F_IP_CSUM | NETIF_F_GEN_CSUM)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 5fb72da7da03..e74c294929a0 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -175,6 +175,9 @@ enum {
 
         /* This indicates the skb is from an untrusted source. */
         SKB_GSO_DODGY = 1 << 2,
+
+        /* This indicates the tcp segment has CWR set. */
+        SKB_GSO_TCPV4_ECN = 1 << 3,
 };
 
 /** 
diff --git a/include/net/sock.h b/include/net/sock.h
index 2d8d6adf1616..7136bae48c2f 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -383,7 +383,6 @@ enum sock_flags {
         SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */
         SOCK_DBG, /* %SO_DEBUG setting */
         SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */
-        SOCK_NO_LARGESEND, /* whether to sent large segments or not */
         SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
         SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
 };
@@ -1033,7 +1032,7 @@ static inline void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
         if (sk->sk_route_caps & NETIF_F_GSO)
                 sk->sk_route_caps |= NETIF_F_TSO;
         if (sk->sk_route_caps & NETIF_F_TSO) {
-                if (sock_flag(sk, SOCK_NO_LARGESEND) || dst->header_len)
+                if (dst->header_len)
                         sk->sk_route_caps &= ~NETIF_F_TSO;
                 else 
                         sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
diff --git a/include/net/tcp_ecn.h b/include/net/tcp_ecn.h
index c6b84397448d..7bb366f70934 100644
--- a/include/net/tcp_ecn.h
+++ b/include/net/tcp_ecn.h
@@ -31,10 +31,9 @@ static inline void TCP_ECN_send_syn(struct sock *sk, struct tcp_sock *tp,
                                     struct sk_buff *skb)
 {
         tp->ecn_flags = 0;
-        if (sysctl_tcp_ecn && !(sk->sk_route_caps & NETIF_F_TSO)) {
+        if (sysctl_tcp_ecn) {
                 TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_ECE|TCPCB_FLAG_CWR;
                 tp->ecn_flags = TCP_ECN_OK;
-                sock_set_flag(sk, SOCK_NO_LARGESEND);
         }
 }
 
@@ -56,6 +55,9 @@ static inline void TCP_ECN_send(struct sock *sk, struct tcp_sock *tp,
                         if (tp->ecn_flags&TCP_ECN_QUEUE_CWR) {
                                 tp->ecn_flags &= ~TCP_ECN_QUEUE_CWR;
                                 skb->h.th->cwr = 1;
+                                if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
+                                        skb_shinfo(skb)->gso_type |=
+                                                SKB_GSO_TCPV4_ECN;
                         }
                 } else {
                         /* ACK or retransmitted segment: clear ECT|CE */