tcp: Replace constants with #define macros
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>
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@ -238,6 +238,11 @@ struct tcp_sack_block {
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u32 end_seq;
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};
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/*These are used to set the sack_ok field in struct tcp_options_received */
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#define TCP_SACK_SEEN (1 << 0) /*1 = peer is SACK capable, */
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#define TCP_FACK_ENABLED (1 << 1) /*1 = FACK is enabled locally*/
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#define TCP_DSACK_SEEN (1 << 2) /*1 = DSACK was received from peer*/
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struct tcp_options_received {
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/* PAWS/RTTM data */
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long ts_recent_stamp;/* Time we stored ts_recent (for aging) */
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@ -773,12 +773,12 @@ static inline int tcp_is_reno(const struct tcp_sock *tp)
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static inline int tcp_is_fack(const struct tcp_sock *tp)
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{
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return tp->rx_opt.sack_ok & 2;
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return tp->rx_opt.sack_ok & TCP_FACK_ENABLED;
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}
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static inline void tcp_enable_fack(struct tcp_sock *tp)
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{
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tp->rx_opt.sack_ok |= 2;
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tp->rx_opt.sack_ok |= TCP_FACK_ENABLED;
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}
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static inline unsigned int tcp_left_out(const struct tcp_sock *tp)
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@ -245,7 +245,7 @@ bool cookie_check_timestamp(struct tcp_options_received *tcp_opt, bool *ecn_ok)
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if (!sysctl_tcp_timestamps)
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return false;
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tcp_opt->sack_ok = (options >> 4) & 0x1;
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tcp_opt->sack_ok = (options & (1 << 4)) ? TCP_SACK_SEEN : 0;
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*ecn_ok = (options >> 5) & 1;
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if (*ecn_ok && !sysctl_tcp_ecn)
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return false;
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@ -865,13 +865,13 @@ static void tcp_disable_fack(struct tcp_sock *tp)
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/* RFC3517 uses different metric in lost marker => reset on change */
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if (tcp_is_fack(tp))
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tp->lost_skb_hint = NULL;
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tp->rx_opt.sack_ok &= ~2;
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tp->rx_opt.sack_ok &= ~TCP_FACK_ENABLED;
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}
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/* Take a notice that peer is sending D-SACKs */
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static void tcp_dsack_seen(struct tcp_sock *tp)
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{
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tp->rx_opt.sack_ok |= 4;
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tp->rx_opt.sack_ok |= TCP_DSACK_SEEN;
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}
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/* Initialize metrics on socket. */
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@ -3878,7 +3878,7 @@ void tcp_parse_options(const struct sk_buff *skb, struct tcp_options_received *o
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case TCPOPT_SACK_PERM:
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if (opsize == TCPOLEN_SACK_PERM && th->syn &&
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!estab && sysctl_tcp_sack) {
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opt_rx->sack_ok = 1;
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opt_rx->sack_ok = TCP_SACK_SEEN;
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tcp_sack_reset(opt_rx);
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}
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break;
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