TCP_SKB_CB(skb)->end_seq = seq;
}
-static inline int tcp_urg_mode(const struct tcp_sock *tp)
+static inline bool tcp_urg_mode(const struct tcp_sock *tp)
{
return tp->snd_una != tp->snd_up;
}
}
/* Minshall's variant of the Nagle send check. */
-static inline int tcp_minshall_check(const struct tcp_sock *tp)
+static inline bool tcp_minshall_check(const struct tcp_sock *tp)
{
return after(tp->snd_sml, tp->snd_una) &&
!after(tp->snd_sml, tp->snd_nxt);
}
-/* Return 0, if packet can be sent now without violation Nagle's rules:
+/* Return false, if packet can be sent now without violation Nagle's rules:
* 1. It is full sized.
* 2. Or it contains FIN. (already checked by caller)
* 3. Or TCP_CORK is not set, and TCP_NODELAY is set.
* 4. Or TCP_CORK is not set, and all sent packets are ACKed.
* With Minshall's modification: all sent small packets are ACKed.
*/
-static inline int tcp_nagle_check(const struct tcp_sock *tp,
+static inline bool tcp_nagle_check(const struct tcp_sock *tp,
const struct sk_buff *skb,
unsigned int mss_now, int nonagle)
{
(!nonagle && tp->packets_out && tcp_minshall_check(tp)));
}
-/* Return non-zero if the Nagle test allows this packet to be
+/* Return true if the Nagle test allows this packet to be
* sent now.
*/
-static inline int tcp_nagle_test(const struct tcp_sock *tp, const struct sk_buff *skb,
- unsigned int cur_mss, int nonagle)
+static inline bool tcp_nagle_test(const struct tcp_sock *tp, const struct sk_buff *skb,
+ unsigned int cur_mss, int nonagle)
{
/* Nagle rule does not apply to frames, which sit in the middle of the
* write_queue (they have no chances to get new data).
* argument based upon the location of SKB in the send queue.
*/
if (nonagle & TCP_NAGLE_PUSH)
- return 1;
+ return true;
/* Don't use the nagle rule for urgent data (or for the final FIN).
* Nagle can be ignored during F-RTO too (see RFC4138).
*/
if (tcp_urg_mode(tp) || (tp->frto_counter == 2) ||
(TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN))
- return 1;
+ return true;
if (!tcp_nagle_check(tp, skb, cur_mss, nonagle))
- return 1;
+ return true;
- return 0;
+ return false;
}
/* Does at least the first segment of SKB fit into the send window? */
-static inline int tcp_snd_wnd_test(const struct tcp_sock *tp, const struct sk_buff *skb,
- unsigned int cur_mss)
+static bool tcp_snd_wnd_test(const struct tcp_sock *tp,
+ const struct sk_buff *skb,
+ unsigned int cur_mss)
{
u32 end_seq = TCP_SKB_CB(skb)->end_seq;
}
/* Test if sending is allowed right now. */
-int tcp_may_send_now(struct sock *sk)
+bool tcp_may_send_now(struct sock *sk)
{
const struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb = tcp_send_head(sk);
*
* This algorithm is from John Heffner.
*/
-static int tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb)
+static bool tcp_tso_should_defer(struct sock *sk, struct sk_buff *skb)
{
struct tcp_sock *tp = tcp_sk(sk);
const struct inet_connection_sock *icsk = inet_csk(sk);
/* Ok, it looks like it is advisable to defer. */
tp->tso_deferred = 1 | (jiffies << 1);
- return 1;
+ return true;
send_now:
tp->tso_deferred = 0;
- return 0;
+ return false;
}
/* Create a new MTU probe if we are ready.
* snd_up-64k-mss .. snd_up cannot be large. However, taking into
* account rare use of URG, this is not a big flaw.
*
- * Returns 1, if no segments are in flight and we have queued segments, but
- * cannot send anything now because of SWS or another problem.
+ * Returns true, if no segments are in flight and we have queued segments,
+ * but cannot send anything now because of SWS or another problem.
*/
-static int tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
- int push_one, gfp_t gfp)
+static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
+ int push_one, gfp_t gfp)
{
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb;
/* Do MTU probing. */
result = tcp_mtu_probe(sk);
if (!result) {
- return 0;
+ return false;
} else if (result > 0) {
sent_pkts = 1;
}
if (likely(sent_pkts)) {
tcp_cwnd_validate(sk);
- return 0;
+ return false;
}
return !tp->packets_out && tcp_send_head(sk);
}
}
/* Check if coalescing SKBs is legal. */
-static int tcp_can_collapse(const struct sock *sk, const struct sk_buff *skb)
+static bool tcp_can_collapse(const struct sock *sk, const struct sk_buff *skb)
{
if (tcp_skb_pcount(skb) > 1)
- return 0;
+ return false;
/* TODO: SACK collapsing could be used to remove this condition */
if (skb_shinfo(skb)->nr_frags != 0)
- return 0;
+ return false;
if (skb_cloned(skb))
- return 0;
+ return false;
if (skb == tcp_send_head(sk))
- return 0;
+ return false;
/* Some heurestics for collapsing over SACK'd could be invented */
if (TCP_SKB_CB(skb)->sacked & TCPCB_SACKED_ACKED)
- return 0;
+ return false;
- return 1;
+ return true;
}
/* Collapse packets in the retransmit queue to make to create
{
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *skb = to, *tmp;
- int first = 1;
+ bool first = true;
if (!sysctl_tcp_retrans_collapse)
return;
space -= skb->len;
if (first) {
- first = 0;
+ first = false;
continue;
}
/* Check if we forward retransmits are possible in the current
* window/congestion state.
*/
-static int tcp_can_forward_retransmit(struct sock *sk)
+static bool tcp_can_forward_retransmit(struct sock *sk)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
const struct tcp_sock *tp = tcp_sk(sk);
/* Forward retransmissions are possible only during Recovery. */
if (icsk->icsk_ca_state != TCP_CA_Recovery)
- return 0;
+ return false;
/* No forward retransmissions in Reno are possible. */
if (tcp_is_reno(tp))
- return 0;
+ return false;
/* Yeah, we have to make difficult choice between forward transmission
* and retransmission... Both ways have their merits...
*/
if (tcp_may_send_now(sk))
- return 0;
+ return false;
- return 1;
+ return true;
}
/* This gets called after a retransmit timeout, and the initially
projects / mirror_ubuntu-zesty-kernel.git / blobdiff