Mercurial > hg > nginx
diff src/event/quic/ngx_event_quic_output.c @ 9147:58afcd72446f
QUIC: path MTU discovery.
MTU selection starts by doubling the initial MTU until the first failure.
Then binary search is used to find the path MTU.
| author | Roman Arutyunyan <arut@nginx.com> |
|---|---|
| date | Mon, 14 Aug 2023 09:21:27 +0400 |
| parents | f3412ec3b6d1 |
| children | 60c4e8d3151f |
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--- a/src/event/quic/ngx_event_quic_output.c +++ b/src/event/quic/ngx_event_quic_output.c @@ -10,9 +10,6 @@ #include <ngx_event_quic_connection.h> -#define NGX_QUIC_MAX_UDP_PAYLOAD_OUT 1252 -#define NGX_QUIC_MAX_UDP_PAYLOAD_OUT6 1232 - #define NGX_QUIC_MAX_UDP_SEGMENT_BUF 65487 /* 65K - IPv6 header */ #define NGX_QUIC_MAX_SEGMENTS 64 /* UDP_MAX_SEGMENTS */ @@ -61,21 +58,6 @@ static size_t ngx_quic_path_limit(ngx_co size_t size); -size_t -ngx_quic_max_udp_payload(ngx_connection_t *c) -{ - /* TODO: path MTU discovery */ - -#if (NGX_HAVE_INET6) - if (c->sockaddr->sa_family == AF_INET6) { - return NGX_QUIC_MAX_UDP_PAYLOAD_OUT6; - } -#endif - - return NGX_QUIC_MAX_UDP_PAYLOAD_OUT; -} - - ngx_int_t ngx_quic_output(ngx_connection_t *c) { @@ -142,10 +124,7 @@ ngx_quic_create_datagrams(ngx_connection p = dst; - len = ngx_min(qc->ctp.max_udp_payload_size, - NGX_QUIC_MAX_UDP_PAYLOAD_SIZE); - - len = ngx_quic_path_limit(c, path, len); + len = ngx_quic_path_limit(c, path, path->mtu); pad = ngx_quic_get_padding_level(c); @@ -299,9 +278,7 @@ ngx_quic_allow_segmentation(ngx_connecti ctx = ngx_quic_get_send_ctx(qc, ssl_encryption_application); bytes = 0; - - len = ngx_min(qc->ctp.max_udp_payload_size, - NGX_QUIC_MAX_UDP_SEGMENT_BUF); + len = ngx_min(qc->path->mtu, NGX_QUIC_MAX_UDP_SEGMENT_BUF); for (q = ngx_queue_head(&ctx->frames); q != ngx_queue_sentinel(&ctx->frames); @@ -345,8 +322,7 @@ ngx_quic_create_segments(ngx_connection_ return NGX_ERROR; } - segsize = ngx_min(qc->ctp.max_udp_payload_size, - NGX_QUIC_MAX_UDP_SEGMENT_BUF); + segsize = ngx_min(path->mtu, NGX_QUIC_MAX_UDP_SEGMENT_BUF); p = dst; end = dst + sizeof(dst);