[nginx] Stream: the "deferred" parameter of the "listen" directive.

[Sergey Kandaurov]

details:   https://hg.nginx.org/nginx/rev/bed832296f5d
branches:  
changeset: 9221:bed832296f5d
user:      Sergey Kandaurov <pluk...@nginx.com>
date:      Fri Mar 22 14:53:19 2024 +0400
description:
Stream: the "deferred" parameter of the "listen" directive.

The Linux TCP_DEFER_ACCEPT support.

diffstat:

 src/stream/ngx_stream.c             |   4 ++++
 src/stream/ngx_stream.h             |   1 +
 src/stream/ngx_stream_core_module.c |  19 +++++++++++++++++++
 3 files changed, 24 insertions(+), 0 deletions(-)

diffs (61 lines):

diff -r c8cf6b1cc82e -r bed832296f5d src/stream/ngx_stream.c
--- a/src/stream/ngx_stream.c   Fri Mar 22 14:53:19 2024 +0400
+++ b/src/stream/ngx_stream.c   Fri Mar 22 14:53:19 2024 +0400
@@ -1021,6 +1021,10 @@ ngx_stream_add_listening(ngx_conf_t *cf,
     ls->keepcnt = addr->opt.tcp_keepcnt;
 #endif
 
+#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
+    ls->deferred_accept = addr->opt.deferred_accept;
+#endif
+
 #if (NGX_HAVE_INET6)
     ls->ipv6only = addr->opt.ipv6only;
 #endif
diff -r c8cf6b1cc82e -r bed832296f5d src/stream/ngx_stream.h
--- a/src/stream/ngx_stream.h   Fri Mar 22 14:53:19 2024 +0400
+++ b/src/stream/ngx_stream.h   Fri Mar 22 14:53:19 2024 +0400
@@ -53,6 +53,7 @@ typedef struct {
 #if (NGX_HAVE_INET6)
     unsigned                       ipv6only:1;
 #endif
+    unsigned                       deferred_accept:1;
     unsigned                       reuseport:1;
     unsigned                       so_keepalive:2;
     unsigned                       proxy_protocol:1;
diff -r c8cf6b1cc82e -r bed832296f5d src/stream/ngx_stream_core_module.c
--- a/src/stream/ngx_stream_core_module.c       Fri Mar 22 14:53:19 2024 +0400
+++ b/src/stream/ngx_stream_core_module.c       Fri Mar 22 14:53:19 2024 +0400
@@ -1015,6 +1015,19 @@ ngx_stream_core_listen(ngx_conf_t *cf, n
             continue;
         }
 
+        if (ngx_strcmp(value[i].data, "deferred") == 0) {
+#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
+            lsopt.deferred_accept = 1;
+            lsopt.set = 1;
+            lsopt.bind = 1;
+#else
+            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                               "the deferred accept is not supported "
+                               "on this platform, ignored");
+#endif
+            continue;
+        }
+
         if (ngx_strncmp(value[i].data, "ipv6only=o", 10) == 0) {
 #if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)
             if (ngx_strcmp(&value[i].data[10], "n") == 0) {
@@ -1173,6 +1186,12 @@ ngx_stream_core_listen(ngx_conf_t *cf, n
             return "\"backlog\" parameter is incompatible with \"udp\"";
         }
 
+#if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
+        if (lsopt.deferred_accept) {
+            return "\"deferred\" parameter is incompatible with \"udp\"";
+        }
+#endif
+
 #if (NGX_STREAM_SSL)
         if (lsopt.ssl) {
             return "\"ssl\" parameter is incompatible with \"udp\"";
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