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-rw-r--r--include/linux/tcp.h4
-rw-r--r--include/net/tcp.h1
2 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 3ba8b074612..a778ee02459 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -104,6 +104,7 @@ enum {
#define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */
#define TCP_COOKIE_TRANSACTIONS 15 /* TCP Cookie Transactions */
#define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/
+#define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */
/* for TCP_INFO socket option */
#define TCPI_OPT_TIMESTAMPS 1
@@ -343,7 +344,8 @@ struct tcp_sock {
u8 frto_counter; /* Number of new acks after RTO */
u8 nonagle : 4,/* Disable Nagle algorithm? */
thin_lto : 1,/* Use linear timeouts for thin streams */
- unused : 3;
+ thin_dupack : 1,/* Fast retransmit on first dupack */
+ unused : 2;
/* RTT measurement */
u32 srtt; /* smoothed round trip time << 3 */
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 6278fc734ab..56f0aec40ed 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -245,6 +245,7 @@ extern int sysctl_tcp_slow_start_after_idle;
extern int sysctl_tcp_max_ssthresh;
extern int sysctl_tcp_cookie_size;
extern int sysctl_tcp_thin_linear_timeouts;
+extern int sysctl_tcp_thin_dupack;
extern atomic_t tcp_memory_allocated;
extern struct percpu_counter tcp_sockets_allocated;