[Spice-devel] [PATCH spice-server v2] reds-stream: Introduce reds_stream_set_no_delay() helper
Frediano Ziglio
fziglio at redhat.com
Mon Feb 27 12:35:15 UTC 2017
From: Christophe Fergeau <cfergeau at redhat.com>
The code to enable/disable on a TCP socket is duplicated in multiple
places in the code base, this commit replaces this duplicated code with
a helper in RedsStream.
---
server/common-graphics-channel.c | 15 +++------------
server/red-channel-client.c | 17 ++---------------
server/reds-stream.c | 16 ++++++++++++++++
server/reds-stream.h | 1 +
server/reds.c | 8 +-------
server/sound.c | 8 +-------
6 files changed, 24 insertions(+), 41 deletions(-)
Changes since v1:
- boolean style updates
diff --git a/server/common-graphics-channel.c b/server/common-graphics-channel.c
index bad6e8c..d04c509 100644
--- a/server/common-graphics-channel.c
+++ b/server/common-graphics-channel.c
@@ -19,9 +19,6 @@
#endif
#include <fcntl.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <netinet/tcp.h>
#include "common-graphics-channel.h"
#include "dcc.h"
@@ -117,24 +114,18 @@ int common_channel_config_socket(RedChannelClient *rcc)
RedClient *client = red_channel_client_get_client(rcc);
MainChannelClient *mcc = red_client_get_main(client);
RedsStream *stream = red_channel_client_get_stream(rcc);
- int delay_val;
- gboolean is_low_bandwidth;
+ bool is_low_bandwidth;
// TODO - this should be dynamic, not one time at channel creation
is_low_bandwidth = main_channel_client_is_low_bandwidth(mcc);
- delay_val = is_low_bandwidth ? 0 : 1;
/* FIXME: Using Nagle's Algorithm can lead to apparent delays, depending
* on the delayed ack timeout on the other side.
* Instead of using Nagle's, we need to implement message buffering on
* the application level.
* see: http://www.stuartcheshire.org/papers/NagleDelayedAck/
*/
- if (setsockopt(stream->socket, IPPROTO_TCP, TCP_NODELAY, &delay_val,
- sizeof(delay_val)) == -1) {
- if (errno != ENOTSUP) {
- spice_warning("setsockopt failed, %s", strerror(errno));
- }
- }
+ reds_stream_set_no_delay(stream, is_low_bandwidth);
+
// TODO: move wide/narrow ack setting to red_channel.
red_channel_client_ack_set_client_window(rcc,
is_low_bandwidth ?
diff --git a/server/red-channel-client.c b/server/red-channel-client.c
index b583da2..ef52701 100644
--- a/server/red-channel-client.c
+++ b/server/red-channel-client.c
@@ -600,13 +600,7 @@ static void red_channel_client_send_ping(RedChannelClient *rcc)
} else {
rcc->priv->latency_monitor.tcp_nodelay = delay_val;
if (!delay_val) {
- delay_val = 1;
- if (setsockopt(rcc->priv->stream->socket, IPPROTO_TCP, TCP_NODELAY, &delay_val,
- sizeof(delay_val)) == -1) {
- if (errno != ENOTSUP) {
- spice_warning("setsockopt failed, %s", strerror(errno));
- }
- }
+ reds_stream_set_no_delay(rcc->priv->stream, true);
}
}
}
@@ -1430,14 +1424,7 @@ static void red_channel_client_handle_pong(RedChannelClient *rcc, SpiceMsgPing *
/* set TCP_NODELAY=0, in case we reverted it for the test*/
if (!rcc->priv->latency_monitor.tcp_nodelay) {
- int delay_val = 0;
-
- if (setsockopt(rcc->priv->stream->socket, IPPROTO_TCP, TCP_NODELAY, &delay_val,
- sizeof(delay_val)) == -1) {
- if (errno != ENOTSUP) {
- spice_warning("setsockopt failed, %s", strerror(errno));
- }
- }
+ reds_stream_set_no_delay(rcc->priv->stream, false);
}
/*
diff --git a/server/reds-stream.c b/server/reds-stream.c
index d0dadb9..2c6aaba 100644
--- a/server/reds-stream.c
+++ b/server/reds-stream.c
@@ -21,6 +21,7 @@
#include <errno.h>
#include <netdb.h>
+#include <netinet/tcp.h>
#include <unistd.h>
#include <sys/socket.h>
#include <fcntl.h>
@@ -256,6 +257,21 @@ int reds_stream_is_plain_unix(const RedsStream *s)
}
+bool reds_stream_set_no_delay(RedsStream *stream, bool no_delay)
+{
+ int delay_val = no_delay;
+
+ if (setsockopt(stream->socket, IPPROTO_TCP, TCP_NODELAY,
+ &delay_val, sizeof(delay_val)) != 0) {
+ if (errno != ENOTSUP && errno != ENOPROTOOPT) {
+ spice_printerr("setsockopt failed, %s", strerror(errno));
+ return false;
+ }
+ }
+
+ return true;
+}
+
int reds_stream_send_msgfd(RedsStream *stream, int fd)
{
struct msghdr msgh = { 0, };
diff --git a/server/reds-stream.h b/server/reds-stream.h
index a8d1736..c76014b 100644
--- a/server/reds-stream.h
+++ b/server/reds-stream.h
@@ -74,6 +74,7 @@ int reds_stream_enable_ssl(RedsStream *stream, SSL_CTX *ctx);
void reds_stream_set_info_flag(RedsStream *stream, unsigned int flag);
int reds_stream_get_family(const RedsStream *stream);
int reds_stream_is_plain_unix(const RedsStream *stream);
+bool reds_stream_set_no_delay(RedsStream *stream, bool no_delay);
int reds_stream_send_msgfd(RedsStream *stream, int fd);
typedef enum {
diff --git a/server/reds.c b/server/reds.c
index 39a7a31..ad9fcc4 100644
--- a/server/reds.c
+++ b/server/reds.c
@@ -2387,7 +2387,6 @@ static bool reds_init_keepalive(int socket)
static RedLinkInfo *reds_init_client_connection(RedsState *reds, int socket)
{
RedLinkInfo *link;
- int delay_val = 1;
int flags;
if ((flags = fcntl(socket, F_GETFL)) == -1) {
@@ -2400,17 +2399,12 @@ static RedLinkInfo *reds_init_client_connection(RedsState *reds, int socket)
goto error;
}
- if (setsockopt(socket, IPPROTO_TCP, TCP_NODELAY, &delay_val, sizeof(delay_val)) == -1) {
- if (errno != ENOTSUP) {
- spice_warning("setsockopt failed, %s", strerror(errno));
- }
- }
-
reds_init_keepalive(socket);
link = spice_new0(RedLinkInfo, 1);
link->reds = reds;
link->stream = reds_stream_new(reds, socket);
+ reds_stream_set_no_delay(link->stream, true);
/* gather info + send event */
diff --git a/server/sound.c b/server/sound.c
index e83a547..0c92480 100644
--- a/server/sound.c
+++ b/server/sound.c
@@ -739,7 +739,6 @@ static void record_channel_send_item(RedChannelClient *rcc, G_GNUC_UNUSED RedPip
static int snd_channel_config_socket(RedChannelClient *rcc)
{
- int delay_val;
#ifdef SO_PRIORITY
int priority;
#endif
@@ -765,12 +764,7 @@ static int snd_channel_config_socket(RedChannelClient *rcc)
}
}
- delay_val = main_channel_client_is_low_bandwidth(mcc) ? 0 : 1;
- if (setsockopt(stream->socket, IPPROTO_TCP, TCP_NODELAY, &delay_val, sizeof(delay_val)) == -1) {
- if (errno != ENOTSUP) {
- spice_printerr("setsockopt failed, %s", strerror(errno));
- }
- }
+ reds_stream_set_no_delay(stream, main_channel_client_is_low_bandwidth(mcc));
return TRUE;
}
--
2.9.3
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