tcp: change TCP_ECN prefixes to lower case

Suggested by Stephen. Also drop inline keyword and let compiler decide.

gcc 4.7.3 decides to no longer inline tcp_ecn_check_ce, so split it up.
The actual evaluation is not inlined anymore while the ECN_OK test is.

Suggested-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 34 insertions, 31 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 174181e28ef3..aa38f98b7884 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -201,28 +201,25 @@ static inline bool tcp_in_quickack_mode(const struct sock *sk)
         return icsk->icsk_ack.quick && !icsk->icsk_ack.pingpong;
 }
 
-static inline void TCP_ECN_queue_cwr(struct tcp_sock *tp)
+static void tcp_ecn_queue_cwr(struct tcp_sock *tp)
 {
         if (tp->ecn_flags & TCP_ECN_OK)
                 tp->ecn_flags |= TCP_ECN_QUEUE_CWR;
 }
 
-static inline void TCP_ECN_accept_cwr(struct tcp_sock *tp, const struct sk_buff *skb)
+static void tcp_ecn_accept_cwr(struct tcp_sock *tp, const struct sk_buff *skb)
 {
         if (tcp_hdr(skb)->cwr)
                 tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR;
 }
 
-static inline void TCP_ECN_withdraw_cwr(struct tcp_sock *tp)
+static void tcp_ecn_withdraw_cwr(struct tcp_sock *tp)
 {
         tp->ecn_flags &= ~TCP_ECN_DEMAND_CWR;
 }
 
-static inline void TCP_ECN_check_ce(struct tcp_sock *tp, const struct sk_buff *skb)
+static void __tcp_ecn_check_ce(struct tcp_sock *tp, const struct sk_buff *skb)
 {
-        if (!(tp->ecn_flags & TCP_ECN_OK))
-                return;
-
         switch (TCP_SKB_CB(skb)->ip_dsfield & INET_ECN_MASK) {
         case INET_ECN_NOT_ECT:
                 /* Funny extension: if ECT is not set on a segment,
@@ -251,19 +248,25 @@ static inline void TCP_ECN_check_ce(struct tcp_sock *tp, const struct sk_buff *s
         }
 }
 
-static inline void TCP_ECN_rcv_synack(struct tcp_sock *tp, const struct tcphdr *th)
+static void tcp_ecn_check_ce(struct tcp_sock *tp, const struct sk_buff *skb)
+{
+        if (tp->ecn_flags & TCP_ECN_OK)
+                __tcp_ecn_check_ce(tp, skb);
+}
+
+static void tcp_ecn_rcv_synack(struct tcp_sock *tp, const struct tcphdr *th)
 {
         if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || th->cwr))
                 tp->ecn_flags &= ~TCP_ECN_OK;
 }
 
-static inline void TCP_ECN_rcv_syn(struct tcp_sock *tp, const struct tcphdr *th)
+static void tcp_ecn_rcv_syn(struct tcp_sock *tp, const struct tcphdr *th)
 {
         if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || !th->cwr))
                 tp->ecn_flags &= ~TCP_ECN_OK;
 }
 
-static bool TCP_ECN_rcv_ecn_echo(const struct tcp_sock *tp, const struct tcphdr *th)
+static bool tcp_ecn_rcv_ecn_echo(const struct tcp_sock *tp, const struct tcphdr *th)
 {
         if (th->ece && !th->syn && (tp->ecn_flags & TCP_ECN_OK))
                 return true;
@@ -660,7 +663,7 @@ static void tcp_event_data_recv(struct sock *sk, struct sk_buff *skb)
         }
         icsk->icsk_ack.lrcvtime = now;
 
-        TCP_ECN_check_ce(tp, skb);
+        tcp_ecn_check_ce(tp, skb);
 
         if (skb->len >= 128)
                 tcp_grow_window(sk, skb);
@@ -1976,7 +1979,7 @@ void tcp_enter_loss(struct sock *sk)
                                        sysctl_tcp_reordering);
         tcp_set_ca_state(sk, TCP_CA_Loss);
         tp->high_seq = tp->snd_nxt;
-        TCP_ECN_queue_cwr(tp);
+        tcp_ecn_queue_cwr(tp);
 
         /* F-RTO RFC5682 sec 3.1 step 1: retransmit SND.UNA if no previous
          * loss recovery is underway except recurring timeout(s) on
@@ -2368,7 +2371,7 @@ static void tcp_undo_cwnd_reduction(struct sock *sk, bool unmark_loss)
 
                 if (tp->prior_ssthresh > tp->snd_ssthresh) {
                         tp->snd_ssthresh = tp->prior_ssthresh;
-                        TCP_ECN_withdraw_cwr(tp);
+                        tcp_ecn_withdraw_cwr(tp);
                 }
         } else {
                 tp->snd_cwnd = max(tp->snd_cwnd, tp->snd_ssthresh);
@@ -2498,7 +2501,7 @@ static void tcp_init_cwnd_reduction(struct sock *sk)
         tp->prr_delivered = 0;
         tp->prr_out = 0;
         tp->snd_ssthresh = inet_csk(sk)->icsk_ca_ops->ssthresh(sk);
-        TCP_ECN_queue_cwr(tp);
+        tcp_ecn_queue_cwr(tp);
 }
 
 static void tcp_cwnd_reduction(struct sock *sk, const int prior_unsacked,
@@ -3453,7 +3456,7 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
                         flag |= tcp_sacktag_write_queue(sk, skb, prior_snd_una,
                                                         &sack_rtt_us);
 
-                if (TCP_ECN_rcv_ecn_echo(tp, tcp_hdr(skb))) {
+                if (tcp_ecn_rcv_ecn_echo(tp, tcp_hdr(skb))) {
                         flag |= FLAG_ECE;
                         ack_ev_flags |= CA_ACK_ECE;
                 }
@@ -4193,7 +4196,7 @@ static void tcp_data_queue_ofo(struct sock *sk, struct sk_buff *skb)
         struct sk_buff *skb1;
         u32 seq, end_seq;
 
-        TCP_ECN_check_ce(tp, skb);
+        tcp_ecn_check_ce(tp, skb);
 
         if (unlikely(tcp_try_rmem_schedule(sk, skb, skb->truesize))) {
                 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPOFODROP);
@@ -4376,7 +4379,7 @@ static void tcp_data_queue(struct sock *sk, struct sk_buff *skb)
         skb_dst_drop(skb);
         __skb_pull(skb, tcp_hdr(skb)->doff * 4);
 
-        TCP_ECN_accept_cwr(tp, skb);
+        tcp_ecn_accept_cwr(tp, skb);
 
         tp->rx_opt.dsack = 0;
 
@@ -5457,7 +5460,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
                  *    state to ESTABLISHED..."
                  */
 
-                TCP_ECN_rcv_synack(tp, th);
+                tcp_ecn_rcv_synack(tp, th);
 
                 tcp_init_wl(tp, TCP_SKB_CB(skb)->seq);
                 tcp_ack(sk, skb, FLAG_SLOWPATH);
@@ -5576,7 +5579,7 @@ discard:
                 tp->snd_wl1    = TCP_SKB_CB(skb)->seq;
                 tp->max_window = tp->snd_wnd;
 
-                TCP_ECN_rcv_syn(tp, th);
+                tcp_ecn_rcv_syn(tp, th);
 
                 tcp_mtup_init(sk);
                 tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 47b73506b77e..63d2680b65db 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -393,8 +393,8 @@ void tcp_openreq_init_rwin(struct request_sock *req,
 }
 EXPORT_SYMBOL(tcp_openreq_init_rwin);
 
-static inline void TCP_ECN_openreq_child(struct tcp_sock *tp,
-                                         struct request_sock *req)
+static void tcp_ecn_openreq_child(struct tcp_sock *tp,
+                                  const struct request_sock *req)
 {
         tp->ecn_flags = inet_rsk(req)->ecn_ok ? TCP_ECN_OK : 0;
 }
@@ -507,7 +507,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
                 if (skb->len >= TCP_MSS_DEFAULT + newtp->tcp_header_len)
                         newicsk->icsk_ack.last_seg_size = skb->len - newtp->tcp_header_len;
                 newtp->rx_opt.mss_clamp = req->mss;
-                TCP_ECN_openreq_child(newtp, req);
+                tcp_ecn_openreq_child(newtp, req);
                 newtp->fastopen_rsk = NULL;
                 newtp->syn_data_acked = 0;
 
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 86a0216fcaa1..ee567e9e98c3 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -318,7 +318,7 @@ static u16 tcp_select_window(struct sock *sk)
 }
 
 /* Packet ECN state for a SYN-ACK */
-static inline void TCP_ECN_send_synack(struct sock *sk, struct sk_buff *skb)
+static void tcp_ecn_send_synack(struct sock *sk, struct sk_buff *skb)
 {
         const struct tcp_sock *tp = tcp_sk(sk);
 
@@ -330,7 +330,7 @@ static inline void TCP_ECN_send_synack(struct sock *sk, struct sk_buff *skb)
 }
 
 /* Packet ECN state for a SYN.  */
-static inline void TCP_ECN_send_syn(struct sock *sk, struct sk_buff *skb)
+static void tcp_ecn_send_syn(struct sock *sk, struct sk_buff *skb)
 {
         struct tcp_sock *tp = tcp_sk(sk);
 
@@ -344,8 +344,8 @@ static inline void TCP_ECN_send_syn(struct sock *sk, struct sk_buff *skb)
         }
 }
 
-static __inline__ void
-TCP_ECN_make_synack(const struct request_sock *req, struct tcphdr *th,
+static void
+tcp_ecn_make_synack(const struct request_sock *req, struct tcphdr *th,
                     struct sock *sk)
 {
         if (inet_rsk(req)->ecn_ok) {
@@ -358,7 +358,7 @@ TCP_ECN_make_synack(const struct request_sock *req, struct tcphdr *th,
 /* Set up ECN state for a packet on a ESTABLISHED socket that is about to
  * be sent.
  */
-static inline void TCP_ECN_send(struct sock *sk, struct sk_buff *skb,
+static void tcp_ecn_send(struct sock *sk, struct sk_buff *skb,
                                 int tcp_header_len)
 {
         struct tcp_sock *tp = tcp_sk(sk);
@@ -960,7 +960,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
 
         tcp_options_write((__be32 *)(th + 1), tp, &opts);
         if (likely((tcb->tcp_flags & TCPHDR_SYN) == 0))
-                TCP_ECN_send(sk, skb, tcp_header_size);
+                tcp_ecn_send(sk, skb, tcp_header_size);
 
 #ifdef CONFIG_TCP_MD5SIG
         /* Calculate the MD5 hash, as we have all we need now */
@@ -2800,7 +2800,7 @@ int tcp_send_synack(struct sock *sk)
                 }
 
                 TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ACK;
-                TCP_ECN_send_synack(sk, skb);
+                tcp_ecn_send_synack(sk, skb);
         }
         return tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC);
 }
@@ -2859,7 +2859,7 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
         memset(th, 0, sizeof(struct tcphdr));
         th->syn = 1;
         th->ack = 1;
-        TCP_ECN_make_synack(req, th, sk);
+        tcp_ecn_make_synack(req, th, sk);
         th->source = htons(ireq->ir_num);
         th->dest = ireq->ir_rmt_port;
         /* Setting of flags are superfluous here for callers (and ECE is
@@ -3098,7 +3098,7 @@ int tcp_connect(struct sock *sk)
         tcp_init_nondata_skb(buff, tp->write_seq++, TCPHDR_SYN);
         tp->retrans_stamp = tcp_time_stamp;
         tcp_connect_queue_skb(sk, buff);
-        TCP_ECN_send_syn(sk, buff);
+        tcp_ecn_send_syn(sk, buff);
 
         /* Send off SYN; include data in Fast Open. */
         err = tp->fastopen_req ? tcp_send_syn_data(sk, buff) :