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authorIlpo Järvinen <ilpo.jarvinen@helsinki.fi>2007-08-09 15:14:46 +0300
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:48:00 -0700
commite60402d0a909ca2e6e2fbdf9ed004ef0fae36d33 (patch)
treeb40a00b801cf44f81bebd7dadddb19c0086b145c /include/net/tcp.h
parentb9c4595bc4947faa236a849324fe3492e388d949 (diff)
downloadop-kernel-dev-e60402d0a909ca2e6e2fbdf9ed004ef0fae36d33.zip
op-kernel-dev-e60402d0a909ca2e6e2fbdf9ed004ef0fae36d33.tar.gz
[TCP]: Move sack_ok access to obviously named funcs & cleanup
Previously code had IsReno/IsFack defined as macros that were local to tcp_input.c though sack_ok field has user elsewhere too for the same purpose. This changes them to static inlines as preferred according the current coding style and unifies the access to sack_ok across multiple files. Magic bitops of sack_ok for FACK and DSACK are also abstracted to functions with appropriate names. Note: - One sack_ok = 1 remains but that's self explanary, i.e., it enables sack - Couple of !IsReno cases are changed to tcp_is_sack - There were no users for IsDSack => I dropped it Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tcp.h')
-rw-r--r--include/net/tcp.h28
1 files changed, 28 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index b92bdc7..0a4ed6e 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -719,6 +719,34 @@ static inline void tcp_ca_event(struct sock *sk, const enum tcp_ca_event event)
icsk->icsk_ca_ops->cwnd_event(sk, event);
}
+/* These functions determine how the current flow behaves in respect of SACK
+ * handling. SACK is negotiated with the peer, and therefore it can vary
+ * between different flows.
+ *
+ * tcp_is_sack - SACK enabled
+ * tcp_is_reno - No SACK
+ * tcp_is_fack - FACK enabled, implies SACK enabled
+ */
+static inline int tcp_is_sack(const struct tcp_sock *tp)
+{
+ return tp->rx_opt.sack_ok;
+}
+
+static inline int tcp_is_reno(const struct tcp_sock *tp)
+{
+ return !tcp_is_sack(tp);
+}
+
+static inline int tcp_is_fack(const struct tcp_sock *tp)
+{
+ return tp->rx_opt.sack_ok & 2;
+}
+
+static inline void tcp_enable_fack(struct tcp_sock *tp)
+{
+ tp->rx_opt.sack_ok |= 2;
+}
+
static inline unsigned int tcp_left_out(const struct tcp_sock *tp)
{
return tp->sacked_out + tp->lost_out;
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