1 files changed, 31 insertions, 27 deletions

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index b31b6b74aa28..fe77e1499ab7 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -224,6 +224,12 @@ struct tcp_options_received {
         u16     mss_clamp;      /* Maximal mss, negotiated at connection setup */
 };
 
+/* This is the max number of SACKS that we'll generate and process. It's safe
+ * to increse this, although since:
+ *   size = TCPOLEN_SACK_BASE_ALIGNED (4) + n * TCPOLEN_SACK_PERBLOCK (8)
+ * only four options will fit in a standard TCP header */
+#define TCP_NUM_SACKS 4
+
 struct tcp_request_sock {
         struct inet_request_sock        req;
 #ifdef CONFIG_TCP_MD5SIG
@@ -291,10 +297,9 @@ struct tcp_sock {
         u32     rcv_ssthresh;   /* Current window clamp                 */
 
         u32     frto_highmark;  /* snd_nxt when RTO occurred */
-        u8      reordering;     /* Packet reordering metric.            */
+        u16     advmss;         /* Advertised MSS                       */
         u8      frto_counter;   /* Number of new acks after RTO */
         u8      nonagle;        /* Disable Nagle algorithm?             */
-        u8      keepalive_probes; /* num of allowed keep alive probes   */
 
 /* RTT measurement */
         u32     srtt;           /* smoothed round trip time << 3        */
@@ -305,6 +310,13 @@ struct tcp_sock {
 
         u32     packets_out;    /* Packets which are "in flight"        */
         u32     retrans_out;    /* Retransmitted packets out            */
+
+        u16     urg_data;       /* Saved octet of OOB data and control flags */
+        u8      ecn_flags;      /* ECN status bits.                     */
+        u8      reordering;     /* Packet reordering metric.            */
+        u32     snd_up;         /* Urgent pointer               */
+
+        u8      keepalive_probes; /* num of allowed keep alive probes   */
 /*
  *      Options received (usually on last packet, some only on SYN packets).
  */
@@ -320,13 +332,23 @@ struct tcp_sock {
         u32     snd_cwnd_used;
         u32     snd_cwnd_stamp;
 
-        struct sk_buff_head     out_of_order_queue; /* Out of order segments go here */
-
         u32     rcv_wnd;        /* Current receiver window              */
         u32     write_seq;      /* Tail(+1) of data held in tcp send buffer */
         u32     pushed_seq;     /* Last pushed seq, required to talk to windows */
+        u32     lost_out;       /* Lost packets                 */
+        u32     sacked_out;     /* SACK'd packets                       */
+        u32     fackets_out;    /* FACK'd packets                       */
+        u32     tso_deferred;
+        u32     bytes_acked;    /* Appropriate Byte Counting - RFC3465 */
 
-/*      SACKs data      */
+        /* from STCP, retrans queue hinting */
+        struct sk_buff* lost_skb_hint;
+        struct sk_buff *scoreboard_skb_hint;
+        struct sk_buff *retransmit_skb_hint;
+
+        struct sk_buff_head     out_of_order_queue; /* Out of order segments go here */
+
+        /* SACKs data, these 2 need to be together (see tcp_build_and_update_options) */
         struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
         struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
 
@@ -337,23 +359,12 @@ struct tcp_sock {
                                          * sacked_out > 0)
                                          */
 
-        /* from STCP, retrans queue hinting */
-        struct sk_buff* lost_skb_hint;
-
-        struct sk_buff *scoreboard_skb_hint;
-        struct sk_buff *retransmit_skb_hint;
-        struct sk_buff *forward_skb_hint;
-
         int     lost_cnt_hint;
-        int     retransmit_cnt_hint;
+        u32     retransmit_high;        /* L-bits may be on up to this seqno */
 
         u32     lost_retrans_low;       /* Sent seq after any rxmit (lowest) */
 
-        u16     advmss;         /* Advertised MSS                       */
         u32     prior_ssthresh; /* ssthresh saved at recovery start     */
-        u32     lost_out;       /* Lost packets                 */
-        u32     sacked_out;     /* SACK'd packets                       */
-        u32     fackets_out;    /* FACK'd packets                       */
         u32     high_seq;       /* snd_nxt at onset of congestion       */
 
         u32     retrans_stamp;  /* Timestamp of the last retransmit,
@@ -361,23 +372,14 @@ struct tcp_sock {
                                  * the first SYN. */
         u32     undo_marker;    /* tracking retrans started here. */
         int     undo_retrans;   /* number of undoable retransmissions. */
-        u32     urg_seq;        /* Seq of received urgent pointer */
-        u16     urg_data;       /* Saved octet of OOB data and control flags */
-        u8      urg_mode;       /* In urgent mode               */
-        u8      ecn_flags;      /* ECN status bits.                     */
-        u32     snd_up;         /* Urgent pointer               */
-
         u32     total_retrans;  /* Total retransmits for entire connection */
-        u32     bytes_acked;    /* Appropriate Byte Counting - RFC3465 */
 
+        u32     urg_seq;        /* Seq of received urgent pointer */
         unsigned int            keepalive_time;   /* time before keep alive takes place */
         unsigned int            keepalive_intvl;  /* time interval between keep alive probes */
-        int                     linger2;
 
         unsigned long last_synq_overflow; 
 
-        u32     tso_deferred;
-
 /* Receiver side RTT estimation */
         struct {
                 u32     rtt;
@@ -405,6 +407,8 @@ struct tcp_sock {
 /* TCP MD5 Signagure Option information */
         struct tcp_md5sig_info  *md5sig_info;
 #endif
+
+        int                     linger2;
 };
 
 static inline struct tcp_sock *tcp_sk(const struct sock *sk)