Mercurial > hg > nginx
view src/event/quic/ngx_event_quic_socket.c @ 8946:56dec0d4e5b1 quic
QUIC: avoid excessive buffer allocations in stream output.
Previously, when a few bytes were send to a QUIC stream by the application, a
4K buffer was allocated for these bytes. Then a STREAM frame was created and
that entire buffer was used as data for that frame. The frame with the buffer
were in use up until the frame was acked by client. Meanwhile, when more
bytes were send to the stream, more buffers were allocated and assigned as
data to newer STREAM frames. In this scenario most buffer memory is unused.
Now the unused part of the stream output buffer is available for further
stream output while earlier parts of the buffer are waiting to be acked.
This is achieved by splitting the output buffer.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Fri, 24 Dec 2021 18:13:51 +0300 |
parents | fb41e37ddeb0 |
children | 32daba3aabb2 |
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/* * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <ngx_event_quic_connection.h> static ngx_int_t ngx_quic_create_temp_socket(ngx_connection_t *c, ngx_quic_connection_t *qc, ngx_str_t *dcid, ngx_quic_path_t *path, ngx_quic_client_id_t *cid); ngx_int_t ngx_quic_open_sockets(ngx_connection_t *c, ngx_quic_connection_t *qc, ngx_quic_header_t *pkt) { ngx_quic_path_t *path; ngx_quic_socket_t *qsock; ngx_quic_client_id_t *cid; /* * qc->nclient_ids = 0 * qc->nsockets = 0 * qc->max_retired_seqnum = 0 * qc->client_seqnum = 0 */ ngx_queue_init(&qc->sockets); ngx_queue_init(&qc->free_sockets); ngx_queue_init(&qc->paths); ngx_queue_init(&qc->free_paths); ngx_queue_init(&qc->client_ids); ngx_queue_init(&qc->free_client_ids); qc->tp.original_dcid.len = pkt->odcid.len; qc->tp.original_dcid.data = ngx_pstrdup(c->pool, &pkt->odcid); if (qc->tp.original_dcid.data == NULL) { return NGX_ERROR; } /* socket to use for further processing */ qsock = ngx_quic_alloc_socket(c, qc); if (qsock == NULL) { return NGX_ERROR; } /* socket is listening at new server id (autogenerated) */ if (ngx_quic_listen(c, qc, qsock) != NGX_OK) { return NGX_ERROR; } qc->tp.initial_scid.len = qsock->sid.len; qc->tp.initial_scid.data = ngx_pnalloc(c->pool, qsock->sid.len); if (qc->tp.initial_scid.data == NULL) { goto failed; } ngx_memcpy(qc->tp.initial_scid.data, qsock->sid.id, qsock->sid.len); /* for all packets except first, this is set at udp layer */ c->udp = &qsock->udp; /* ngx_quic_get_connection(c) macro is now usable */ /* we have a client identified by scid */ cid = ngx_quic_create_client_id(c, &pkt->scid, 0, NULL); if (cid == NULL) { goto failed; } /* the client arrived from this path */ path = ngx_quic_add_path(c, c->sockaddr, c->socklen); if (path == NULL) { goto failed; } if (pkt->validated) { path->state = NGX_QUIC_PATH_VALIDATED; path->limited = 0; } /* now bind socket to client and path */ ngx_quic_connect(c, qsock, path, cid); if (ngx_quic_create_temp_socket(c, qc, &pkt->odcid, path, cid) != NGX_OK) { goto failed; } /* use this socket as default destination */ qc->socket = qsock; ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic active socket is #%uL:%uL:%uL (%s)", qsock->sid.seqnum, qsock->cid->seqnum, qsock->path->seqnum, ngx_quic_path_state_str(qsock->path)); return NGX_OK; failed: ngx_rbtree_delete(&c->listening->rbtree, &qsock->udp.node); c->udp = NULL; return NGX_ERROR; } static ngx_int_t ngx_quic_create_temp_socket(ngx_connection_t *c, ngx_quic_connection_t *qc, ngx_str_t *dcid, ngx_quic_path_t *path, ngx_quic_client_id_t *cid) { ngx_str_t id; ngx_quic_socket_t *qsock; ngx_quic_server_id_t *sid; qsock = ngx_quic_alloc_socket(c, qc); if (qsock == NULL) { return NGX_ERROR; } sid = &qsock->sid; sid->seqnum = NGX_QUIC_UNSET_PN; /* mark socket as temporary */ sid->len = dcid->len; ngx_memcpy(sid->id, dcid->data, dcid->len); id.len = sid->len; id.data = sid->id; ngx_insert_udp_connection(c, &qsock->udp, &id); ngx_queue_insert_tail(&qc->sockets, &qsock->queue); qc->nsockets++; qsock->quic = qc; ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic socket #%L listening at sid:%xV nsock:%ui", (int64_t) sid->seqnum, &id, qc->nsockets); ngx_quic_connect(c, qsock, path, cid); return NGX_OK; } ngx_quic_socket_t * ngx_quic_alloc_socket(ngx_connection_t *c, ngx_quic_connection_t *qc) { ngx_queue_t *q; ngx_quic_socket_t *sock; if (!ngx_queue_empty(&qc->free_sockets)) { q = ngx_queue_head(&qc->free_sockets); sock = ngx_queue_data(q, ngx_quic_socket_t, queue); ngx_queue_remove(&sock->queue); ngx_memzero(sock, sizeof(ngx_quic_socket_t)); } else { sock = ngx_pcalloc(c->pool, sizeof(ngx_quic_socket_t)); if (sock == NULL) { return NULL; } } return sock; } void ngx_quic_close_socket(ngx_connection_t *c, ngx_quic_socket_t *qsock) { ngx_quic_connection_t *qc; qc = ngx_quic_get_connection(c); ngx_queue_remove(&qsock->queue); ngx_queue_insert_head(&qc->free_sockets, &qsock->queue); ngx_rbtree_delete(&c->listening->rbtree, &qsock->udp.node); qc->nsockets--; if (qsock->path) { ngx_quic_unref_path(c, qsock->path); } if (qsock->cid) { ngx_quic_unref_client_id(c, qsock->cid); } ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic socket #%L closed nsock:%ui", (int64_t) qsock->sid.seqnum, qc->nsockets); } void ngx_quic_unref_path(ngx_connection_t *c, ngx_quic_path_t *path) { ngx_quic_connection_t *qc; path->refcnt--; if (path->refcnt) { return; } qc = ngx_quic_get_connection(c); ngx_queue_remove(&path->queue); ngx_queue_insert_head(&qc->free_paths, &path->queue); ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic path #%uL addr:%V removed", path->seqnum, &path->addr_text); } ngx_int_t ngx_quic_listen(ngx_connection_t *c, ngx_quic_connection_t *qc, ngx_quic_socket_t *qsock) { ngx_str_t id; ngx_quic_server_id_t *sid; sid = &qsock->sid; sid->len = NGX_QUIC_SERVER_CID_LEN; if (ngx_quic_create_server_id(c, sid->id) != NGX_OK) { return NGX_ERROR; } sid->seqnum = qc->server_seqnum++; id.data = sid->id; id.len = sid->len; ngx_insert_udp_connection(c, &qsock->udp, &id); ngx_queue_insert_tail(&qc->sockets, &qsock->queue); qc->nsockets++; qsock->quic = qc; ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic socket #%uL listening at sid:%xV nsock:%ui", sid->seqnum, &id, qc->nsockets); return NGX_OK; } void ngx_quic_connect(ngx_connection_t *c, ngx_quic_socket_t *sock, ngx_quic_path_t *path, ngx_quic_client_id_t *cid) { sock->path = path; path->refcnt++; sock->cid = cid; cid->refcnt++; ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, "quic socket #%L connected to cid #%uL path:%uL", (int64_t) sock->sid.seqnum, sock->cid->seqnum, path->seqnum); } void ngx_quic_close_sockets(ngx_connection_t *c) { ngx_queue_t *q; ngx_quic_socket_t *qsock; ngx_quic_connection_t *qc; qc = ngx_quic_get_connection(c); while (!ngx_queue_empty(&qc->sockets)) { q = ngx_queue_head(&qc->sockets); qsock = ngx_queue_data(q, ngx_quic_socket_t, queue); ngx_quic_close_socket(c, qsock); } } ngx_quic_socket_t * ngx_quic_find_socket(ngx_connection_t *c, uint64_t seqnum) { ngx_queue_t *q; ngx_quic_socket_t *qsock; ngx_quic_connection_t *qc; qc = ngx_quic_get_connection(c); for (q = ngx_queue_head(&qc->sockets); q != ngx_queue_sentinel(&qc->sockets); q = ngx_queue_next(q)) { qsock = ngx_queue_data(q, ngx_quic_socket_t, queue); if (qsock->sid.seqnum == seqnum) { return qsock; } } return NULL; } ngx_quic_socket_t * ngx_quic_get_unconnected_socket(ngx_connection_t *c) { ngx_queue_t *q; ngx_quic_socket_t *sock; ngx_quic_connection_t *qc; qc = ngx_quic_get_connection(c); for (q = ngx_queue_head(&qc->sockets); q != ngx_queue_sentinel(&qc->sockets); q = ngx_queue_next(q)) { sock = ngx_queue_data(q, ngx_quic_socket_t, queue); if (sock->cid == NULL) { return sock; } } return NULL; }