From: Neal Cardwell <ncardw...@google.com>
This commit shrinks inet_connection_sock by 4 bytes, by shrinking
icsk_mtup.enabled from 32 bits to 1 bit, and shrinking
icsk_mtup.probe_size from s32 to an unsuigned 31 bit field.
This is to save space to compensate for the recent introduction of a
new u32 in inet_connection_sock, icsk_probes_tstamp, in the recent bug
fix commit 9d9b1ee0b2d1 ("tcp: fix TCP_USER_TIMEOUT with zero window").
This should not change functionality, since icsk_mtup.enabled is only
ever set to 0 or 1, and icsk_mtup.probe_size can only be either 0
or a positive MTU value returned by tcp_mss_to_mtu()
Signed-off-by: Neal Cardwell <ncardw...@google.com>
Signed-off-by: Eric Dumazet <eduma...@google.com>
---
include/net/inet_connection_sock.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/include/net/inet_connection_sock.h
b/include/net/inet_connection_sock.h
index c11f80f328f1..10a625760de9 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -120,14 +120,14 @@ struct inet_connection_sock {
__u16 rcv_mss; /* MSS used for delayed ACK
decisions */
} icsk_ack;
struct {
- int enabled;
-
/* Range of MTUs to search */
int search_high;
int search_low;
/* Information on the current probe. */
- int probe_size;
+ u32 probe_size:31,
+ /* Is the MTUP feature enabled for this connection? */
+ enabled:1;
u32 probe_timestamp;
} icsk_mtup;
--
2.30.0.365.g02bc693789-goog
