mirror of
https://github.com/nginx/nginx.git
synced 2024-11-21 16:28:40 +00:00
QUIC: added support for segmentation offloading.
To improve output performance, UDP segmentation offloading is used if available. If there is a significant amount of data in an output queue and path is verified, QUIC packets are not sent one-by-one, but instead are collected in a buffer, which is then passed to kernel in a single sendmsg call, using UDP GSO. Such method greatly decreases number of system calls and thus system load.
This commit is contained in:
Vladimir Homutov
parent
105de9762f
commit
c0764bc3e9
@ -281,6 +281,27 @@ if [ $ngx_found = yes ]; then
|
||||
fi
|
||||
|
||||
|
||||
# UDP_SEGMENT socket option is used for segmentation offloading
|
||||
|
||||
ngx_feature="UDP_SEGMENT"
|
||||
ngx_feature_name="NGX_HAVE_UDP_SEGMENT"
|
||||
ngx_feature_run=no
|
||||
ngx_feature_incs="#include <sys/socket.h>
|
||||
#include <stdint.h>
|
||||
#include <netinet/udp.h>"
|
||||
ngx_feature_path=
|
||||
ngx_feature_libs=
|
||||
ngx_feature_test="socklen_t optlen = sizeof(int);
|
||||
int val;
|
||||
getsockopt(0, SOL_UDP, UDP_SEGMENT, &val, &optlen)"
|
||||
. auto/feature
|
||||
|
||||
if [ $ngx_found = yes ]; then
|
||||
UDP_SEGMENT_FOUND=YES
|
||||
have=NGX_HAVE_UDP_SEGMENT . auto/have
|
||||
fi
|
||||
|
||||
|
||||
# ngx_quic_bpf module uses sockhash to select socket from reuseport group,
|
||||
# support appeared in Linux-5.7:
|
||||
#
|
||||
|
||||
@ -17,6 +17,9 @@
|
||||
#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 */
|
||||
|
||||
#define NGX_QUIC_RETRY_TOKEN_LIFETIME 3 /* seconds */
|
||||
#define NGX_QUIC_NEW_TOKEN_LIFETIME 600 /* seconds */
|
||||
#define NGX_QUIC_RETRY_BUFFER_SIZE 256
|
||||
@ -39,6 +42,16 @@
|
||||
|
||||
static ngx_int_t ngx_quic_socket_output(ngx_connection_t *c,
|
||||
ngx_quic_socket_t *qsock);
|
||||
static ngx_int_t ngx_quic_create_datagrams(ngx_connection_t *c,
|
||||
ngx_quic_socket_t *qsock);
|
||||
#if ((NGX_HAVE_UDP_SEGMENT) && (NGX_HAVE_MSGHDR_MSG_CONTROL))
|
||||
static ngx_uint_t ngx_quic_allow_segmentation(ngx_connection_t *c,
|
||||
ngx_quic_socket_t *qsock);
|
||||
static ngx_int_t ngx_quic_create_segments(ngx_connection_t *c,
|
||||
ngx_quic_socket_t *qsock);
|
||||
static ssize_t ngx_quic_send_segments(ngx_connection_t *c, u_char *buf,
|
||||
size_t len, struct sockaddr *sockaddr, socklen_t socklen, size_t segment);
|
||||
#endif
|
||||
static ssize_t ngx_quic_output_packet(ngx_connection_t *c,
|
||||
ngx_quic_send_ctx_t *ctx, u_char *data, size_t max, size_t min,
|
||||
ngx_quic_socket_t *qsock);
|
||||
@ -84,16 +97,10 @@ ngx_quic_output(ngx_connection_t *c)
|
||||
static ngx_int_t
|
||||
ngx_quic_socket_output(ngx_connection_t *c, ngx_quic_socket_t *qsock)
|
||||
{
|
||||
off_t max;
|
||||
size_t len, min, in_flight;
|
||||
ssize_t n;
|
||||
u_char *p;
|
||||
ngx_uint_t i, pad;
|
||||
ngx_quic_path_t *path;
|
||||
ngx_quic_send_ctx_t *ctx;
|
||||
size_t in_flight;
|
||||
ngx_int_t rc;
|
||||
ngx_quic_congestion_t *cg;
|
||||
ngx_quic_connection_t *qc;
|
||||
static u_char dst[NGX_QUIC_MAX_UDP_PAYLOAD_SIZE];
|
||||
|
||||
c->log->action = "sending frames";
|
||||
|
||||
@ -102,6 +109,43 @@ ngx_quic_socket_output(ngx_connection_t *c, ngx_quic_socket_t *qsock)
|
||||
|
||||
in_flight = cg->in_flight;
|
||||
|
||||
#if ((NGX_HAVE_UDP_SEGMENT) && (NGX_HAVE_MSGHDR_MSG_CONTROL))
|
||||
if (ngx_quic_allow_segmentation(c, qsock)) {
|
||||
rc = ngx_quic_create_segments(c, qsock);
|
||||
} else
|
||||
#endif
|
||||
{
|
||||
rc = ngx_quic_create_datagrams(c, qsock);
|
||||
}
|
||||
|
||||
if (rc != NGX_OK) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
if (in_flight != cg->in_flight && !qc->send_timer_set && !qc->closing) {
|
||||
qc->send_timer_set = 1;
|
||||
ngx_add_timer(c->read, qc->tp.max_idle_timeout);
|
||||
}
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_quic_create_datagrams(ngx_connection_t *c, ngx_quic_socket_t *qsock)
|
||||
{
|
||||
off_t max;
|
||||
size_t len, min;
|
||||
ssize_t n;
|
||||
u_char *p;
|
||||
ngx_uint_t i, pad;
|
||||
ngx_quic_path_t *path;
|
||||
ngx_quic_send_ctx_t *ctx;
|
||||
ngx_quic_connection_t *qc;
|
||||
static u_char dst[NGX_QUIC_MAX_UDP_PAYLOAD_SIZE];
|
||||
|
||||
qc = ngx_quic_get_connection(c);
|
||||
|
||||
path = qsock->path;
|
||||
|
||||
for ( ;; ) {
|
||||
@ -153,16 +197,198 @@ ngx_quic_socket_output(ngx_connection_t *c, ngx_quic_socket_t *qsock)
|
||||
path->sent += len;
|
||||
}
|
||||
|
||||
if (in_flight != cg->in_flight && !qc->send_timer_set && !qc->closing) {
|
||||
qc->send_timer_set = 1;
|
||||
ngx_add_timer(c->read, qc->tp.max_idle_timeout);
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
#if ((NGX_HAVE_UDP_SEGMENT) && (NGX_HAVE_MSGHDR_MSG_CONTROL))
|
||||
|
||||
static ngx_uint_t
|
||||
ngx_quic_allow_segmentation(ngx_connection_t *c, ngx_quic_socket_t *qsock)
|
||||
{
|
||||
size_t bytes, len;
|
||||
ngx_queue_t *q;
|
||||
ngx_quic_frame_t *f;
|
||||
ngx_quic_send_ctx_t *ctx;
|
||||
ngx_quic_connection_t *qc;
|
||||
|
||||
if (qsock->path->state != NGX_QUIC_PATH_VALIDATED) {
|
||||
/* don't even try to be faster on non-validated paths */
|
||||
return 0;
|
||||
}
|
||||
|
||||
qc = ngx_quic_get_connection(c);
|
||||
|
||||
ctx = ngx_quic_get_send_ctx(qc, ssl_encryption_initial);
|
||||
if (!ngx_queue_empty(&ctx->frames)) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
ctx = ngx_quic_get_send_ctx(qc, ssl_encryption_handshake);
|
||||
if (!ngx_queue_empty(&ctx->frames)) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
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);
|
||||
|
||||
for (q = ngx_queue_head(&ctx->frames);
|
||||
q != ngx_queue_sentinel(&ctx->frames);
|
||||
q = ngx_queue_next(q))
|
||||
{
|
||||
f = ngx_queue_data(q, ngx_quic_frame_t, queue);
|
||||
|
||||
bytes += f->len;
|
||||
|
||||
if (bytes > len * 3) {
|
||||
/* require at least ~3 full packets to batch */
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static ngx_int_t
|
||||
ngx_quic_create_segments(ngx_connection_t *c, ngx_quic_socket_t *qsock)
|
||||
{
|
||||
size_t len, segsize;
|
||||
ssize_t n;
|
||||
u_char *p, *end;
|
||||
ngx_uint_t nseg;
|
||||
ngx_quic_send_ctx_t *ctx;
|
||||
ngx_quic_path_t *path;
|
||||
ngx_quic_connection_t *qc;
|
||||
static u_char dst[NGX_QUIC_MAX_UDP_SEGMENT_BUF];
|
||||
|
||||
qc = ngx_quic_get_connection(c);
|
||||
path = qsock->path;
|
||||
|
||||
ctx = ngx_quic_get_send_ctx(qc, ssl_encryption_application);
|
||||
|
||||
if (ngx_quic_generate_ack(c, ctx) != NGX_OK) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
segsize = ngx_min(qc->ctp.max_udp_payload_size,
|
||||
NGX_QUIC_MAX_UDP_SEGMENT_BUF);
|
||||
p = dst;
|
||||
end = dst + sizeof(dst);
|
||||
|
||||
nseg = 0;
|
||||
|
||||
for ( ;; ) {
|
||||
|
||||
len = ngx_min(segsize, (size_t) (end - p));
|
||||
|
||||
if (len) {
|
||||
|
||||
n = ngx_quic_output_packet(c, ctx, p, len, len, qsock);
|
||||
if (n == NGX_ERROR) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
p += n;
|
||||
nseg++;
|
||||
|
||||
} else {
|
||||
n = 0;
|
||||
}
|
||||
|
||||
if (p == dst) {
|
||||
break;
|
||||
}
|
||||
|
||||
if (n == 0 || nseg == NGX_QUIC_MAX_SEGMENTS) {
|
||||
n = ngx_quic_send_segments(c, dst, p - dst, path->sockaddr,
|
||||
path->socklen, segsize);
|
||||
if (n == NGX_ERROR) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
path->sent += n;
|
||||
|
||||
p = dst;
|
||||
nseg = 0;
|
||||
}
|
||||
}
|
||||
|
||||
return NGX_OK;
|
||||
}
|
||||
|
||||
|
||||
static ssize_t
|
||||
ngx_quic_send_segments(ngx_connection_t *c, u_char *buf, size_t len,
|
||||
struct sockaddr *sockaddr, socklen_t socklen, size_t segment)
|
||||
{
|
||||
size_t clen;
|
||||
ssize_t n;
|
||||
uint16_t *valp;
|
||||
struct iovec iov;
|
||||
struct msghdr msg;
|
||||
struct cmsghdr *cmsg;
|
||||
|
||||
#if defined(NGX_HAVE_ADDRINFO_CMSG)
|
||||
char msg_control[CMSG_SPACE(sizeof(uint16_t))
|
||||
+ CMSG_SPACE(sizeof(ngx_addrinfo_t))];
|
||||
#else
|
||||
char msg_control[CMSG_SPACE(sizeof(uint16_t))];
|
||||
#endif
|
||||
|
||||
ngx_memzero(&msg, sizeof(struct msghdr));
|
||||
ngx_memzero(msg_control, sizeof(msg_control));
|
||||
|
||||
iov.iov_len = len;
|
||||
iov.iov_base = buf;
|
||||
|
||||
msg.msg_iov = &iov;
|
||||
msg.msg_iovlen = 1;
|
||||
|
||||
msg.msg_name = sockaddr;
|
||||
msg.msg_namelen = socklen;
|
||||
|
||||
msg.msg_control = msg_control;
|
||||
msg.msg_controllen = sizeof(msg_control);
|
||||
|
||||
cmsg = CMSG_FIRSTHDR(&msg);
|
||||
|
||||
cmsg->cmsg_level = SOL_UDP;
|
||||
cmsg->cmsg_type = UDP_SEGMENT;
|
||||
cmsg->cmsg_len = CMSG_LEN(sizeof(uint16_t));
|
||||
|
||||
clen = CMSG_SPACE(sizeof(uint16_t));
|
||||
|
||||
valp = (void *) CMSG_DATA(cmsg);
|
||||
*valp = segment;
|
||||
|
||||
#if defined(NGX_HAVE_ADDRINFO_CMSG)
|
||||
if (c->listening && c->listening->wildcard && c->local_sockaddr) {
|
||||
cmsg = CMSG_NXTHDR(&msg, cmsg);
|
||||
clen += ngx_set_srcaddr_cmsg(cmsg, c->local_sockaddr);
|
||||
}
|
||||
#endif
|
||||
|
||||
msg.msg_controllen = clen;
|
||||
|
||||
n = ngx_sendmsg(c, &msg, 0);
|
||||
if (n == -1) {
|
||||
return NGX_ERROR;
|
||||
}
|
||||
|
||||
c->sent += n;
|
||||
|
||||
return n;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
|
||||
|
||||
static ngx_uint_t
|
||||
ngx_quic_get_padding_level(ngx_connection_t *c)
|
||||
{
|
||||
|
||||
@ -103,6 +103,10 @@ typedef struct iocb ngx_aiocb_t;
|
||||
#include <linux/capability.h>
|
||||
#endif
|
||||
|
||||
#if (NGX_HAVE_UDP_SEGMENT)
|
||||
#include <netinet/udp.h>
|
||||
#endif
|
||||
|
||||
|
||||
#define NGX_LISTEN_BACKLOG 511
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user