[PATCH 2 of 2] QUIC: removed "quic_mtu" directive

[Roman Arutyunyan]

Hi, 

On Thu, May 11, 2023 at 10:26:34AM +0400, Roman Arutyunyan wrote:
> # HG changeset patch
> # User Roman Arutyunyan <arut at nginx.com>
> # Date 1683783928 -14400
> #      Thu May 11 09:45:28 2023 +0400
> # Branch quic
> # Node ID 5db9c42c3d4bf862642b85d8f508257a1ad9c694
> # Parent  d2cc7adb261edc92988411ac7e0c8059419c201d
> QUIC: removed "quic_mtu" directive.
> 
> The directive used to set the value of the "max_udp_payload_size" transport
> parameter.  According to RFC 9000, Section 18.2, the value specifies the size
> of buffer for reading incoming datagrams:
> 
>     This limit does act as an additional constraint on datagram size in
>     the same way as the path MTU, but it is a property of the endpoint
>     and not the path; see Section 14. It is expected that this is the
>     space an endpoint dedicates to holding incoming packets.
> 
> Current QUIC implementation uses the maximum possible buffer size (65527) for
> reading datagrams.

[..]

Plus README update:

diff --git a/README b/README
--- a/README
+++ b/README
@@ -123,10 +123,6 @@ 3. Configuration
 
         quic_gso on;
 
-    To limit maximum UDP payload size on receive path:
-
-        quic_mtu <size>;
-
     To set host key for various tokens:
 
         quic_host_key <filename>;
@@ -209,14 +205,6 @@ 4. Directives
     Optimized sending is only supported on Linux featuring UDP_SEGMENT.
 
 
-    Syntax: quic_mtu size;
-    Default: quic_mtu 65527;
-    Context: http | stream, server
-
-    Sets the QUIC max_udp_payload_size transport parameter value.
-    This is the maximum UDP payload that we are willing to receive.
-
-
     Syntax: quic_host_key file;
     Default: -
     Context: http | stream, server

--
Roman Arutyunyan