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tcp: Replace constants with #define macros

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to record the state of SACK/FACK and DSACK for better readability and maintenance.

Signed-off-by: Vijay Subramanian <subramanian.vijay@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vijay Subramanian 2011-12-20 13:23:24 +00:00 • committed by David S. Miller
parent 08f4fc9da9
commit ab56222a32
4 changed files with 11 additions and 6 deletions
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5
include/linux/tcp.h
View file

@ -238,6 +238,11 @@ struct tcp_sack_block {
u32 end_seq; u32 end_seq;
}; };
/*These are used to set the sack_ok field in struct tcp_options_received */
#define TCP_SACK_SEEN (1 << 0) /*1 = peer is SACK capable, */
#define TCP_FACK_ENABLED (1 << 1) /*1 = FACK is enabled locally*/
#define TCP_DSACK_SEEN (1 << 2) /*1 = DSACK was received from peer*/
struct tcp_options_received { struct tcp_options_received {
/* PAWS/RTTM data */ /* PAWS/RTTM data */
long ts_recent_stamp;/* Time we stored ts_recent (for aging) */ long ts_recent_stamp;/* Time we stored ts_recent (for aging) */

4
include/net/tcp.h
View file

@ -773,12 +773,12 @@ static inline int tcp_is_reno(const struct tcp_sock *tp)
static inline int tcp_is_fack(const struct tcp_sock *tp) static inline int tcp_is_fack(const struct tcp_sock *tp)
{ {
return tp->rx_opt.sack_ok & 2; return tp->rx_opt.sack_ok & TCP_FACK_ENABLED;
} }
static inline void tcp_enable_fack(struct tcp_sock *tp) static inline void tcp_enable_fack(struct tcp_sock *tp)
{ {
tp->rx_opt.sack_ok |= 2; tp->rx_opt.sack_ok |= TCP_FACK_ENABLED;
} }
static inline unsigned int tcp_left_out(const struct tcp_sock *tp) static inline unsigned int tcp_left_out(const struct tcp_sock *tp)

2
net/ipv4/syncookies.c
View file

@ -245,7 +245,7 @@ bool cookie_check_timestamp(struct tcp_options_received *tcp_opt, bool *ecn_ok)
if (!sysctl_tcp_timestamps) if (!sysctl_tcp_timestamps)
return false; return false;
tcp_opt->sack_ok = (options >> 4) & 0x1; tcp_opt->sack_ok = (options & (1 << 4)) ? TCP_SACK_SEEN : 0;
*ecn_ok = (options >> 5) & 1; *ecn_ok = (options >> 5) & 1;
if (*ecn_ok && !sysctl_tcp_ecn) if (*ecn_ok && !sysctl_tcp_ecn)
return false; return false;

6
net/ipv4/tcp_input.c
View file

@ -865,13 +865,13 @@ static void tcp_disable_fack(struct tcp_sock *tp)
/* RFC3517 uses different metric in lost marker => reset on change */ /* RFC3517 uses different metric in lost marker => reset on change */
if (tcp_is_fack(tp)) if (tcp_is_fack(tp))
tp->lost_skb_hint = NULL; tp->lost_skb_hint = NULL;
tp->rx_opt.sack_ok &= ~2; tp->rx_opt.sack_ok &= ~TCP_FACK_ENABLED;
} }
/* Take a notice that peer is sending D-SACKs */ /* Take a notice that peer is sending D-SACKs */
static void tcp_dsack_seen(struct tcp_sock *tp) static void tcp_dsack_seen(struct tcp_sock *tp)
{ {
tp->rx_opt.sack_ok |= 4; tp->rx_opt.sack_ok |= TCP_DSACK_SEEN;
} }
/* Initialize metrics on socket. */ /* Initialize metrics on socket. */
@ -3878,7 +3878,7 @@ void tcp_parse_options(const struct sk_buff *skb, struct tcp_options_received *o
case TCPOPT_SACK_PERM: case TCPOPT_SACK_PERM:
if (opsize == TCPOLEN_SACK_PERM && th->syn && if (opsize == TCPOLEN_SACK_PERM && th->syn &&
!estab && sysctl_tcp_sack) { !estab && sysctl_tcp_sack) {
opt_rx->sack_ok = 1; opt_rx->sack_ok = TCP_SACK_SEEN;
tcp_sack_reset(opt_rx); tcp_sack_reset(opt_rx);
} }
break; break;