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diff src/event/ngx_event_quic_transport.c @ 8338:0f9e9786b90d quic

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Added primitive flow control mechanisms. + MAX_STREAM_DATA frame is sent when recv() is performed on stream The new value is a sum of total bytes received by stream + free space in a buffer; The sending of MAX_STREM_DATA frame in response to STREAM_DATA_BLOCKED frame is adjusted to follow the same logic as above. + MAX_DATA frame is sent when total amount of received data is 2x of current limit. The limit is doubled. + Default values of transport parameters are adjusted to more meaningful values: initial stream limits are set to quic buffer size instead of unrealistically small 255. initial max data is decreased to 16 buffer sizes, in an assumption that this is enough for a relatively short connection, instead of randomly chosen big number. All this allows to initiate a stable flow of streams that does not block on stream/connection limits (tested with FF 77.0a1 and 100K requests)
author Vladimir Homutov <vl@nginx.com>
date Wed, 15 Apr 2020 18:54:03 +0300
parents 167d32476737
children 76e8ec502c69
line wrap: on
line diff
--- a/src/event/ngx_event_quic_transport.c
+++ b/src/event/ngx_event_quic_transport.c
@@ -77,6 +77,8 @@ static size_t ngx_quic_create_max_stream
     ngx_quic_max_streams_frame_t *ms);
 static size_t ngx_quic_create_max_stream_data(u_char *p,
     ngx_quic_max_stream_data_frame_t *ms);
+static size_t ngx_quic_create_max_data(u_char *p,
+    ngx_quic_max_data_frame_t *md);
 static size_t ngx_quic_create_close(u_char *p, ngx_quic_close_frame_t *cl);
 
 static ngx_int_t ngx_quic_parse_transport_param(u_char *p, u_char *end,
@@ -1196,6 +1198,9 @@ ngx_quic_create_frame(u_char *p, ngx_qui
     case NGX_QUIC_FT_MAX_STREAM_DATA:
         return ngx_quic_create_max_stream_data(p, &f->u.max_stream_data);
 
+    case NGX_QUIC_FT_MAX_DATA:
+        return ngx_quic_create_max_data(p, &f->u.max_data);
+
     default:
         /* BUG: unsupported frame type generated */
         return NGX_ERROR;
@@ -1616,6 +1621,27 @@ ngx_quic_create_max_stream_data(u_char *
 }
 
 
+static size_t
+ngx_quic_create_max_data(u_char *p, ngx_quic_max_data_frame_t *md)
+{
+    size_t   len;
+    u_char  *start;
+
+    if (p == NULL) {
+        len = ngx_quic_varint_len(NGX_QUIC_FT_MAX_DATA);
+        len += ngx_quic_varint_len(md->max_data);
+        return len;
+    }
+
+    start = p;
+
+    ngx_quic_build_int(&p, NGX_QUIC_FT_MAX_DATA);
+    ngx_quic_build_int(&p, md->max_data);
+
+    return p - start;
+}
+
+
 ssize_t
 ngx_quic_create_transport_params(u_char *pos, u_char *end, ngx_quic_tp_t *tp)
 {