inet: get rid of central tcp/dccp listener timer

One of the major issue for TCP is the SYNACK rtx handling,
done by inet_csk_reqsk_queue_prune(), fired by the keepalive
timer of a TCP_LISTEN socket.

This function runs for awful long times, with socket lock held,
meaning that other cpus needing this lock have to spin for hundred of ms.

SYNACK are sent in huge bursts, likely to cause severe drops anyway.

This model was OK 15 years ago when memory was very tight.

We now can afford to have a timer per request sock.

Timer invocations no longer need to lock the listener,
and can be run from all cpus in parallel.

With following patch increasing somaxconn width to 32 bits,
I tested a listener with more than 4 million active request sockets,
and a steady SYNFLOOD of ~200,000 SYN per second.
Host was sending ~830,000 SYNACK per second.

This is ~100 times more what we could achieve before this patch.

Later, we will get rid of the listener hash and use ehash instead.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 3 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 19c3770f1e97..5554b8f33d41 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -475,6 +475,7 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
 
                 if (seq != tcp_rsk(req)->snt_isn) {
                         NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
+                        reqsk_put(req);
                         goto out;
                 }
 
@@ -486,6 +487,7 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
                  */
                 inet_csk_reqsk_queue_drop(sk, req);
                 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
+                reqsk_put(req);
                 goto out;
 
         case TCP_SYN_SENT:
@@ -1398,8 +1400,11 @@ static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
         struct sock *nsk;
 
         req = inet_csk_search_req(sk, th->source, iph->saddr, iph->daddr);
-        if (req)
-                return tcp_check_req(sk, skb, req, false);
+        if (req) {
+                nsk = tcp_check_req(sk, skb, req, false);
+                reqsk_put(req);
+                return nsk;
+        }
 
         nsk = inet_lookup_established(sock_net(sk), &tcp_hashinfo, iph->saddr,
                         th->source, iph->daddr, th->dest, inet_iif(skb));
@@ -2208,7 +2213,7 @@ static void get_openreq4(const struct request_sock *req,
                          struct seq_file *f, int i, kuid_t uid)
 {
         const struct inet_request_sock *ireq = inet_rsk(req);
-        long delta = req->expires - jiffies;
+        long delta = req->rsk_timer.expires - jiffies;
 
         seq_printf(f, "%4d: %08X:%04X %08X:%04X"
                 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %u %d %pK",