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-rw-r--r--include/net/tcp.h15
-rw-r--r--net/ipv4/tcp_output.c66
2 files changed, 34 insertions, 47 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index e54c76d7549..1b94b9bfe2d 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -616,21 +616,6 @@ static inline int tcp_skb_mss(const struct sk_buff *skb)
return skb_shinfo(skb)->gso_size;
}
-static inline void tcp_dec_pcount_approx_int(__u32 *count, const int decr)
-{
- if (*count) {
- *count -= decr;
- if ((int)*count < 0)
- *count = 0;
- }
-}
-
-static inline void tcp_dec_pcount_approx(__u32 *count,
- const struct sk_buff *skb)
-{
- tcp_dec_pcount_approx_int(count, tcp_skb_pcount(skb));
-}
-
/* Events passed to congestion control interface */
enum tcp_ca_event {
CA_EVENT_TX_START, /* first transmit when no packets in flight */
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index c1f259d2d33..f1db89bb3aa 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -754,6 +754,36 @@ static void tcp_adjust_fackets_out(struct sock *sk, struct sk_buff *skb,
tp->fackets_out -= decr;
}
+/* Pcount in the middle of the write queue got changed, we need to do various
+ * tweaks to fix counters
+ */
+static void tcp_adjust_pcount(struct sock *sk, struct sk_buff *skb, int decr)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ tp->packets_out -= decr;
+
+ if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)
+ tp->sacked_out -= decr;
+ if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS)
+ tp->retrans_out -= decr;
+ if (TCP_SKB_CB(skb)->sacked & TCPCB_LOST)
+ tp->lost_out -= decr;
+
+ /* Reno case is special. Sigh... */
+ if (tcp_is_reno(tp) && decr > 0)
+ tp->sacked_out -= min_t(u32, tp->sacked_out, decr);
+
+ tcp_adjust_fackets_out(sk, skb, decr);
+
+ if (tp->lost_skb_hint &&
+ before(TCP_SKB_CB(skb)->seq, TCP_SKB_CB(tp->lost_skb_hint)->seq) &&
+ (tcp_is_fack(tp) || TCP_SKB_CB(skb)->sacked))
+ tp->lost_cnt_hint -= decr;
+
+ tcp_verify_left_out(tp);
+}
+
/* Function to create two new TCP segments. Shrinks the given segment
* to the specified size and appends a new segment with the rest of the
* packet to the list. This won't be called frequently, I hope.
@@ -836,28 +866,8 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len,
int diff = old_factor - tcp_skb_pcount(skb) -
tcp_skb_pcount(buff);
- tp->packets_out -= diff;
-
- if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)
- tp->sacked_out -= diff;
- if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_RETRANS)
- tp->retrans_out -= diff;
-
- if (TCP_SKB_CB(skb)->sacked & TCPCB_LOST)
- tp->lost_out -= diff;
-
- /* Adjust Reno SACK estimate. */
- if (tcp_is_reno(tp) && diff > 0) {
- tcp_dec_pcount_approx_int(&tp->sacked_out, diff);
- tcp_verify_left_out(tp);
- }
- tcp_adjust_fackets_out(sk, skb, diff);
-
- if (tp->lost_skb_hint &&
- before(TCP_SKB_CB(skb)->seq,
- TCP_SKB_CB(tp->lost_skb_hint)->seq) &&
- (tcp_is_fack(tp) || TCP_SKB_CB(skb)->sacked))
- tp->lost_cnt_hint -= diff;
+ if (diff)
+ tcp_adjust_pcount(sk, skb, diff);
}
/* Link BUFF into the send queue. */
@@ -1768,22 +1778,14 @@ static void tcp_collapse_retrans(struct sock *sk, struct sk_buff *skb)
* packet counting does not break.
*/
TCP_SKB_CB(skb)->sacked |= TCP_SKB_CB(next_skb)->sacked & TCPCB_EVER_RETRANS;
- if (TCP_SKB_CB(next_skb)->sacked & TCPCB_SACKED_RETRANS)
- tp->retrans_out -= tcp_skb_pcount(next_skb);
- if (TCP_SKB_CB(next_skb)->sacked & TCPCB_LOST)
- tp->lost_out -= tcp_skb_pcount(next_skb);
- /* Reno case is special. Sigh... */
- if (tcp_is_reno(tp) && tp->sacked_out)
- tcp_dec_pcount_approx(&tp->sacked_out, next_skb);
-
- tcp_adjust_fackets_out(sk, next_skb, tcp_skb_pcount(next_skb));
- tp->packets_out -= tcp_skb_pcount(next_skb);
/* changed transmit queue under us so clear hints */
tcp_clear_retrans_hints_partial(tp);
if (next_skb == tp->retransmit_skb_hint)
tp->retransmit_skb_hint = skb;
+ tcp_adjust_pcount(sk, next_skb, tcp_skb_pcount(next_skb));
+
sk_wmem_free_skb(sk, next_skb);
}