@samitouri / QOSamiQemu
Code Commits Issues Pulls Sessions CI/CD
master
master
c 176 lines 3.76 KB
Raw
1 /*
2 * Vhost User library
3 *
4 * Copyright (c) 2016 Nutanix Inc. All rights reserved.
5 * Copyright (c) 2017 Red Hat, Inc.
6 *
7 * Authors:
8 * Marc-André Lureau <mlureau@redhat.com>
9 * Felipe Franciosi <felipe@nutanix.com>
10 *
11 * This work is licensed under the terms of the GNU GPL, version 2 or
12 * later. See the COPYING file in the top-level directory.
13 */
14
15 #include "libvhost-user-glib.h"
16
17 #ifndef container_of
18 #define container_of(ptr, type, member) \
19 __extension__({ \
20 void *__mptr = (void *)(ptr); \
21 ((type *)(__mptr - offsetof(type, member))); \
22 })
23 #endif
24
25 /* glib event loop integration for libvhost-user and misc callbacks */
26
27 G_STATIC_ASSERT((int)G_IO_IN == (int)VU_WATCH_IN);
28 G_STATIC_ASSERT((int)G_IO_OUT == (int)VU_WATCH_OUT);
29 G_STATIC_ASSERT((int)G_IO_PRI == (int)VU_WATCH_PRI);
30 G_STATIC_ASSERT((int)G_IO_ERR == (int)VU_WATCH_ERR);
31 G_STATIC_ASSERT((int)G_IO_HUP == (int)VU_WATCH_HUP);
32
33 typedef struct VugSrc {
34 GSource parent;
35 VuDev *dev;
36 GPollFD gfd;
37 } VugSrc;
38
39 static gboolean
40 vug_src_prepare(GSource *gsrc, gint *timeout)
41 {
42 g_assert(timeout);
43
44 *timeout = -1;
45 return FALSE;
46 }
47
48 static gboolean
49 vug_src_check(GSource *gsrc)
50 {
51 VugSrc *src = (VugSrc *)gsrc;
52
53 g_assert(src);
54
55 return src->gfd.revents & src->gfd.events;
56 }
57
58 static gboolean
59 vug_src_dispatch(GSource *gsrc, GSourceFunc cb, gpointer data)
60 {
61 VugSrc *src = (VugSrc *)gsrc;
62
63 g_assert(src);
64
65 ((vu_watch_cb)cb)(src->dev, src->gfd.revents, data);
66
67 return G_SOURCE_CONTINUE;
68 }
69
70 static GSourceFuncs vug_src_funcs = {
71 vug_src_prepare,
72 vug_src_check,
73 vug_src_dispatch,
74 NULL
75 };
76
77 GSource *
78 vug_source_new(VugDev *gdev, int fd, GIOCondition cond,
79 vu_watch_cb vu_cb, gpointer data)
80 {
81 VuDev *dev = &gdev->parent;
82 GSource *gsrc;
83 VugSrc *src;
84 guint id;
85
86 g_assert(gdev);
87 g_assert(fd >= 0);
88 g_assert(vu_cb);
89
90 gsrc = g_source_new(&vug_src_funcs, sizeof(VugSrc));
91 g_source_set_callback(gsrc, (GSourceFunc)vu_cb, data, NULL);
92 src = (VugSrc *)gsrc;
93 src->dev = dev;
94 src->gfd.fd = fd;
95 src->gfd.events = cond;
96
97 g_source_add_poll(gsrc, &src->gfd);
98 id = g_source_attach(gsrc, g_main_context_get_thread_default());
99 g_assert(id);
100
101 return gsrc;
102 }
103
104 static void
105 set_watch(VuDev *vu_dev, int fd, int vu_evt, vu_watch_cb cb, void *pvt)
106 {
107 GSource *src;
108 VugDev *dev;
109
110 g_assert(vu_dev);
111 g_assert(fd >= 0);
112 g_assert(cb);
113
114 dev = container_of(vu_dev, VugDev, parent);
115 src = vug_source_new(dev, fd, vu_evt, cb, pvt);
116 g_hash_table_replace(dev->fdmap, GINT_TO_POINTER(fd), src);
117 }
118
119 static void
120 remove_watch(VuDev *vu_dev, int fd)
121 {
122 VugDev *dev;
123
124 g_assert(vu_dev);
125 g_assert(fd >= 0);
126
127 dev = container_of(vu_dev, VugDev, parent);
128 g_hash_table_remove(dev->fdmap, GINT_TO_POINTER(fd));
129 }
130
131
132 static void vug_watch(VuDev *dev, int condition, void *data)
133 {
134 if (!vu_dispatch(dev) != 0) {
135 dev->panic(dev, "Error processing vhost message");
136 }
137 }
138
139 void vug_source_destroy(GSource *src)
140 {
141 if (!src) {
142 return;
143 }
144
145 g_source_destroy(src);
146 g_source_unref(src);
147 }
148
149 bool
150 vug_init(VugDev *dev, uint16_t max_queues, int socket,
151 vu_panic_cb panic, const VuDevIface *iface)
152 {
153 g_assert(dev);
154 g_assert(iface);
155
156 if (!vu_init(&dev->parent, max_queues, socket, panic, NULL, set_watch,
157 remove_watch, iface)) {
158 return false;
159 }
160
161 dev->fdmap = g_hash_table_new_full(NULL, NULL, NULL,
162 (GDestroyNotify) vug_source_destroy);
163
164 dev->src = vug_source_new(dev, socket, G_IO_IN, vug_watch, NULL);
165
166 return true;
167 }
168
169 void
170 vug_deinit(VugDev *dev)
171 {
172 g_assert(dev);
173
174 g_hash_table_unref(dev->fdmap);
175 vug_source_destroy(dev->src);
176 }