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qemu-kvm/SOURCES/kvm-vhost-user-bridge-support-host-notifier.patch

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From d32439f6eb5f0d628c1a9d559007dda3083ec7b8 Mon Sep 17 00:00:00 2001
From: "plai@redhat.com" <plai@redhat.com>
Date: Thu, 21 Jun 2018 18:54:40 +0200
Subject: [PATCH 161/268] vhost-user-bridge: support host notifier
RH-Author: plai@redhat.com
Message-id: <1529607285-9942-6-git-send-email-plai@redhat.com>
Patchwork-id: 80934
O-Subject: [RHEL7.6 PATCH BZ 1526645 05/10] vhost-user-bridge: support host notifier
Bugzilla: 1526645
RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
RH-Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
From: Tiwei Bie <tiwei.bie@intel.com>
This patch introduces the host notifier support in
vhost-user-bridge. A new option (-H) is added to use
the host notifier. This is mainly used to test the
host notifier implementation in vhost user.
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit e3af2928f8270498097af163bb023b633c0d8d1c)
Signed-off-by: Paul Lai <plai@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
tests/vhost-user-bridge.c | 98 +++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 95 insertions(+), 3 deletions(-)
diff --git a/tests/vhost-user-bridge.c b/tests/vhost-user-bridge.c
index e0605a5..0884294 100644
--- a/tests/vhost-user-bridge.c
+++ b/tests/vhost-user-bridge.c
@@ -29,6 +29,7 @@
#define _FILE_OFFSET_BITS 64
+#include "qemu/atomic.h"
#include "qemu/osdep.h"
#include "qemu/iov.h"
#include "standard-headers/linux/virtio_net.h"
@@ -65,6 +66,11 @@ typedef struct VubrDev {
int sock;
int ready;
int quit;
+ struct {
+ int fd;
+ void *addr;
+ pthread_t thread;
+ } notifier;
} VubrDev;
static void
@@ -445,14 +451,22 @@ static uint64_t
vubr_get_features(VuDev *dev)
{
return 1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE |
- 1ULL << VIRTIO_NET_F_MRG_RXBUF;
+ 1ULL << VIRTIO_NET_F_MRG_RXBUF |
+ 1ULL << VIRTIO_F_VERSION_1;
}
static void
vubr_queue_set_started(VuDev *dev, int qidx, bool started)
{
+ VubrDev *vubr = container_of(dev, VubrDev, vudev);
VuVirtq *vq = vu_get_queue(dev, qidx);
+ if (started && vubr->notifier.fd >= 0) {
+ vu_set_queue_host_notifier(dev, vq, vubr->notifier.fd,
+ getpagesize(),
+ qidx * getpagesize());
+ }
+
if (qidx % 2 == 1) {
vu_set_queue_handler(dev, vq, started ? vubr_handle_tx : NULL);
}
@@ -522,6 +536,8 @@ vubr_new(const char *path, bool client)
vubr_die("socket");
}
+ dev->notifier.fd = -1;
+
un.sun_family = AF_UNIX;
strcpy(un.sun_path, path);
len = sizeof(un.sun_family) + strlen(path);
@@ -559,6 +575,73 @@ vubr_new(const char *path, bool client)
return dev;
}
+static void *notifier_thread(void *arg)
+{
+ VuDev *dev = (VuDev *)arg;
+ VubrDev *vubr = container_of(dev, VubrDev, vudev);
+ int pagesize = getpagesize();
+ int qidx;
+
+ while (true) {
+ for (qidx = 0; qidx < VHOST_MAX_NR_VIRTQUEUE; qidx++) {
+ uint16_t *n = vubr->notifier.addr + pagesize * qidx;
+
+ if (*n == qidx) {
+ *n = 0xffff;
+ /* We won't miss notifications if we reset
+ * the memory first. */
+ smp_mb();
+
+ DPRINT("Got a notification for queue%d via host notifier.\n",
+ qidx);
+
+ if (qidx % 2 == 1) {
+ vubr_handle_tx(dev, qidx);
+ }
+ }
+ usleep(1000);
+ }
+ }
+
+ return NULL;
+}
+
+static void
+vubr_host_notifier_setup(VubrDev *dev)
+{
+ char template[] = "/tmp/vubr-XXXXXX";
+ pthread_t thread;
+ size_t length;
+ void *addr;
+ int fd;
+
+ length = getpagesize() * VHOST_MAX_NR_VIRTQUEUE;
+
+ fd = mkstemp(template);
+ if (fd < 0) {
+ vubr_die("mkstemp()");
+ }
+
+ if (posix_fallocate(fd, 0, length) != 0) {
+ vubr_die("posix_fallocate()");
+ }
+
+ addr = mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ if (addr == MAP_FAILED) {
+ vubr_die("mmap()");
+ }
+
+ memset(addr, 0xff, length);
+
+ if (pthread_create(&thread, NULL, notifier_thread, &dev->vudev) != 0) {
+ vubr_die("pthread_create()");
+ }
+
+ dev->notifier.fd = fd;
+ dev->notifier.addr = addr;
+ dev->notifier.thread = thread;
+}
+
static void
vubr_set_host(struct sockaddr_in *saddr, const char *host)
{
@@ -673,8 +756,9 @@ main(int argc, char *argv[])
VubrDev *dev;
int opt;
bool client = false;
+ bool host_notifier = false;
- while ((opt = getopt(argc, argv, "l:r:u:c")) != -1) {
+ while ((opt = getopt(argc, argv, "l:r:u:cH")) != -1) {
switch (opt) {
case 'l':
@@ -693,6 +777,9 @@ main(int argc, char *argv[])
case 'c':
client = true;
break;
+ case 'H':
+ host_notifier = true;
+ break;
default:
goto out;
}
@@ -708,6 +795,10 @@ main(int argc, char *argv[])
return 1;
}
+ if (host_notifier) {
+ vubr_host_notifier_setup(dev);
+ }
+
vubr_backend_udp_setup(dev, lhost, lport, rhost, rport);
vubr_run(dev);
@@ -717,7 +808,7 @@ main(int argc, char *argv[])
out:
fprintf(stderr, "Usage: %s ", argv[0]);
- fprintf(stderr, "[-c] [-u ud_socket_path] [-l lhost:lport] [-r rhost:rport]\n");
+ fprintf(stderr, "[-c] [-H] [-u ud_socket_path] [-l lhost:lport] [-r rhost:rport]\n");
fprintf(stderr, "\t-u path to unix doman socket. default: %s\n",
DEFAULT_UD_SOCKET);
fprintf(stderr, "\t-l local host and port. default: %s:%s\n",
@@ -725,6 +816,7 @@ out:
fprintf(stderr, "\t-r remote host and port. default: %s:%s\n",
DEFAULT_RHOST, DEFAULT_RPORT);
fprintf(stderr, "\t-c client mode\n");
+ fprintf(stderr, "\t-H use host notifier\n");
return 1;
}
--
1.8.3.1
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