1 files changed, 24 insertions, 12 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 1afb080bdf0c..29222b964951 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -923,14 +923,6 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
         int flag = 0;
         int i;
 
-        /* So, SACKs for already sent large segments will be lost.
-         * Not good, but alternative is to resegment the queue. */
-        if (sk->sk_route_caps & NETIF_F_TSO) {
-                sk->sk_route_caps &= ~NETIF_F_TSO;
-                sock_set_flag(sk, SOCK_NO_LARGESEND);
-                tp->mss_cache = tp->mss_cache;
-        }
-
         if (!tp->sacked_out)
                 tp->fackets_out = 0;
         prior_fackets = tp->fackets_out;
@@ -978,20 +970,40 @@ tcp_sacktag_write_queue(struct sock *sk, struct sk_buff *ack_skb, u32 prior_snd_
                         flag |= FLAG_DATA_LOST;
 
                 sk_stream_for_retrans_queue(skb, sk) {
-                        u8 sacked = TCP_SKB_CB(skb)->sacked;
-                        int in_sack;
+                        int in_sack, pcount;
+                        u8 sacked;
 
                         /* The retransmission queue is always in order, so
                          * we can short-circuit the walk early.
                          */
-                        if(!before(TCP_SKB_CB(skb)->seq, end_seq))
+                        if (!before(TCP_SKB_CB(skb)->seq, end_seq))
                                 break;
 
-                        fack_count += tcp_skb_pcount(skb);
+                        pcount = tcp_skb_pcount(skb);
+
+                        if (pcount > 1 &&
+                            (after(start_seq, TCP_SKB_CB(skb)->seq) ||
+                             before(end_seq, TCP_SKB_CB(skb)->end_seq))) {
+                                unsigned int pkt_len;
+
+                                if (after(start_seq, TCP_SKB_CB(skb)->seq))
+                                        pkt_len = (start_seq -
+                                                   TCP_SKB_CB(skb)->seq);
+                                else
+                                        pkt_len = (end_seq -
+                                                   TCP_SKB_CB(skb)->seq);
+                                if (tcp_fragment(sk, skb, pkt_len, skb_shinfo(skb)->tso_size))
+                                        break;
+                                pcount = tcp_skb_pcount(skb);
+                        }
+
+                        fack_count += pcount;
 
                         in_sack = !after(start_seq, TCP_SKB_CB(skb)->seq) &&
                                 !before(end_seq, TCP_SKB_CB(skb)->end_seq);
 
+                        sacked = TCP_SKB_CB(skb)->sacked;
+
                         /* Account D-SACK for retransmitted packet. */
                         if ((dup_sack && in_sack) &&
                             (sacked & TCPCB_RETRANS) &&