1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* loopback transport for vsock using virtio_t 2 /* loopback transport for vsock using virtio_transport_common APIs
3 * 3 *
4 * Copyright (C) 2013-2019 Red Hat, Inc. 4 * Copyright (C) 2013-2019 Red Hat, Inc.
5 * Authors: Asias He <asias@redhat.com> 5 * Authors: Asias He <asias@redhat.com>
6 * Stefan Hajnoczi <stefanha@redhat.c 6 * Stefan Hajnoczi <stefanha@redhat.com>
7 * Stefano Garzarella <sgarzare@redha 7 * Stefano Garzarella <sgarzare@redhat.com>
8 * 8 *
9 */ 9 */
10 #include <linux/spinlock.h> 10 #include <linux/spinlock.h>
11 #include <linux/module.h> 11 #include <linux/module.h>
12 #include <linux/list.h> 12 #include <linux/list.h>
13 #include <linux/virtio_vsock.h> 13 #include <linux/virtio_vsock.h>
14 14
15 struct vsock_loopback { 15 struct vsock_loopback {
16 struct workqueue_struct *workqueue; 16 struct workqueue_struct *workqueue;
17 17
18 struct sk_buff_head pkt_queue; 18 struct sk_buff_head pkt_queue;
19 struct work_struct pkt_work; 19 struct work_struct pkt_work;
20 }; 20 };
21 21
22 static struct vsock_loopback the_vsock_loopbac 22 static struct vsock_loopback the_vsock_loopback;
23 23
24 static u32 vsock_loopback_get_local_cid(void) 24 static u32 vsock_loopback_get_local_cid(void)
25 { 25 {
26 return VMADDR_CID_LOCAL; 26 return VMADDR_CID_LOCAL;
27 } 27 }
28 28
29 static int vsock_loopback_send_pkt(struct sk_b 29 static int vsock_loopback_send_pkt(struct sk_buff *skb)
30 { 30 {
31 struct vsock_loopback *vsock = &the_vs 31 struct vsock_loopback *vsock = &the_vsock_loopback;
32 int len = skb->len; 32 int len = skb->len;
33 33
34 virtio_vsock_skb_queue_tail(&vsock->pk 34 virtio_vsock_skb_queue_tail(&vsock->pkt_queue, skb);
35 queue_work(vsock->workqueue, &vsock->p 35 queue_work(vsock->workqueue, &vsock->pkt_work);
36 36
37 return len; 37 return len;
38 } 38 }
39 39
40 static int vsock_loopback_cancel_pkt(struct vs 40 static int vsock_loopback_cancel_pkt(struct vsock_sock *vsk)
41 { 41 {
42 struct vsock_loopback *vsock = &the_vs 42 struct vsock_loopback *vsock = &the_vsock_loopback;
43 43
44 virtio_transport_purge_skbs(vsk, &vsoc 44 virtio_transport_purge_skbs(vsk, &vsock->pkt_queue);
45 45
46 return 0; 46 return 0;
47 } 47 }
48 48
49 static bool vsock_loopback_seqpacket_allow(u32 49 static bool vsock_loopback_seqpacket_allow(u32 remote_cid);
50 static bool vsock_loopback_msgzerocopy_allow(v 50 static bool vsock_loopback_msgzerocopy_allow(void)
51 { 51 {
52 return true; 52 return true;
53 } 53 }
54 54
55 static struct virtio_transport loopback_transp 55 static struct virtio_transport loopback_transport = {
56 .transport = { 56 .transport = {
57 .module = TH 57 .module = THIS_MODULE,
58 58
59 .get_local_cid = vs 59 .get_local_cid = vsock_loopback_get_local_cid,
60 60
61 .init = vi 61 .init = virtio_transport_do_socket_init,
62 .destruct = vi 62 .destruct = virtio_transport_destruct,
63 .release = vi 63 .release = virtio_transport_release,
64 .connect = vi 64 .connect = virtio_transport_connect,
65 .shutdown = vi 65 .shutdown = virtio_transport_shutdown,
66 .cancel_pkt = vs 66 .cancel_pkt = vsock_loopback_cancel_pkt,
67 67
68 .dgram_bind = vi 68 .dgram_bind = virtio_transport_dgram_bind,
69 .dgram_dequeue = vi 69 .dgram_dequeue = virtio_transport_dgram_dequeue,
70 .dgram_enqueue = vi 70 .dgram_enqueue = virtio_transport_dgram_enqueue,
71 .dgram_allow = vi 71 .dgram_allow = virtio_transport_dgram_allow,
72 72
73 .stream_dequeue = vi 73 .stream_dequeue = virtio_transport_stream_dequeue,
74 .stream_enqueue = vi 74 .stream_enqueue = virtio_transport_stream_enqueue,
75 .stream_has_data = vi 75 .stream_has_data = virtio_transport_stream_has_data,
76 .stream_has_space = vi 76 .stream_has_space = virtio_transport_stream_has_space,
77 .stream_rcvhiwat = vi 77 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
78 .stream_is_active = vi 78 .stream_is_active = virtio_transport_stream_is_active,
79 .stream_allow = vi 79 .stream_allow = virtio_transport_stream_allow,
80 80
81 .seqpacket_dequeue = vi 81 .seqpacket_dequeue = virtio_transport_seqpacket_dequeue,
82 .seqpacket_enqueue = vi 82 .seqpacket_enqueue = virtio_transport_seqpacket_enqueue,
83 .seqpacket_allow = vs 83 .seqpacket_allow = vsock_loopback_seqpacket_allow,
84 .seqpacket_has_data = vi 84 .seqpacket_has_data = virtio_transport_seqpacket_has_data,
85 85
86 .msgzerocopy_allow = vs 86 .msgzerocopy_allow = vsock_loopback_msgzerocopy_allow,
87 87
88 .notify_poll_in = vi 88 .notify_poll_in = virtio_transport_notify_poll_in,
89 .notify_poll_out = vi 89 .notify_poll_out = virtio_transport_notify_poll_out,
90 .notify_recv_init = vi 90 .notify_recv_init = virtio_transport_notify_recv_init,
91 .notify_recv_pre_block = vi 91 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
92 .notify_recv_pre_dequeue = vi 92 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
93 .notify_recv_post_dequeue = vi 93 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
94 .notify_send_init = vi 94 .notify_send_init = virtio_transport_notify_send_init,
95 .notify_send_pre_block = vi 95 .notify_send_pre_block = virtio_transport_notify_send_pre_block,
96 .notify_send_pre_enqueue = vi 96 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
97 .notify_send_post_enqueue = vi 97 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
98 .notify_buffer_size = vi 98 .notify_buffer_size = virtio_transport_notify_buffer_size,
99 .notify_set_rcvlowat = vi 99 .notify_set_rcvlowat = virtio_transport_notify_set_rcvlowat,
100 100
101 .unsent_bytes = vi 101 .unsent_bytes = virtio_transport_unsent_bytes,
102 102
103 .read_skb = virtio_transport_r 103 .read_skb = virtio_transport_read_skb,
104 }, 104 },
105 105
106 .send_pkt = vsock_loopback_send_pkt, 106 .send_pkt = vsock_loopback_send_pkt,
107 }; 107 };
108 108
109 static bool vsock_loopback_seqpacket_allow(u32 109 static bool vsock_loopback_seqpacket_allow(u32 remote_cid)
110 { 110 {
111 return true; 111 return true;
112 } 112 }
113 113
114 static void vsock_loopback_work(struct work_st 114 static void vsock_loopback_work(struct work_struct *work)
115 { 115 {
116 struct vsock_loopback *vsock = 116 struct vsock_loopback *vsock =
117 container_of(work, struct vsoc 117 container_of(work, struct vsock_loopback, pkt_work);
118 struct sk_buff_head pkts; 118 struct sk_buff_head pkts;
119 struct sk_buff *skb; 119 struct sk_buff *skb;
120 120
121 skb_queue_head_init(&pkts); 121 skb_queue_head_init(&pkts);
122 122
123 spin_lock_bh(&vsock->pkt_queue.lock); 123 spin_lock_bh(&vsock->pkt_queue.lock);
124 skb_queue_splice_init(&vsock->pkt_queu 124 skb_queue_splice_init(&vsock->pkt_queue, &pkts);
125 spin_unlock_bh(&vsock->pkt_queue.lock) 125 spin_unlock_bh(&vsock->pkt_queue.lock);
126 126
127 while ((skb = __skb_dequeue(&pkts))) { 127 while ((skb = __skb_dequeue(&pkts))) {
128 /* Decrement the bytes_unsent 128 /* Decrement the bytes_unsent counter without deallocating skb
129 * It is freed by the receiver 129 * It is freed by the receiver.
130 */ 130 */
131 virtio_transport_consume_skb_s 131 virtio_transport_consume_skb_sent(skb, false);
132 virtio_transport_deliver_tap_p 132 virtio_transport_deliver_tap_pkt(skb);
133 virtio_transport_recv_pkt(&loo 133 virtio_transport_recv_pkt(&loopback_transport, skb);
134 } 134 }
135 } 135 }
136 136
137 static int __init vsock_loopback_init(void) 137 static int __init vsock_loopback_init(void)
138 { 138 {
139 struct vsock_loopback *vsock = &the_vs 139 struct vsock_loopback *vsock = &the_vsock_loopback;
140 int ret; 140 int ret;
141 141
142 vsock->workqueue = alloc_workqueue("vs 142 vsock->workqueue = alloc_workqueue("vsock-loopback", 0, 0);
143 if (!vsock->workqueue) 143 if (!vsock->workqueue)
144 return -ENOMEM; 144 return -ENOMEM;
145 145
146 skb_queue_head_init(&vsock->pkt_queue) 146 skb_queue_head_init(&vsock->pkt_queue);
147 INIT_WORK(&vsock->pkt_work, vsock_loop 147 INIT_WORK(&vsock->pkt_work, vsock_loopback_work);
148 148
149 ret = vsock_core_register(&loopback_tr 149 ret = vsock_core_register(&loopback_transport.transport,
150 VSOCK_TRANSP 150 VSOCK_TRANSPORT_F_LOCAL);
151 if (ret) 151 if (ret)
152 goto out_wq; 152 goto out_wq;
153 153
154 return 0; 154 return 0;
155 155
156 out_wq: 156 out_wq:
157 destroy_workqueue(vsock->workqueue); 157 destroy_workqueue(vsock->workqueue);
158 return ret; 158 return ret;
159 } 159 }
160 160
161 static void __exit vsock_loopback_exit(void) 161 static void __exit vsock_loopback_exit(void)
162 { 162 {
163 struct vsock_loopback *vsock = &the_vs 163 struct vsock_loopback *vsock = &the_vsock_loopback;
164 164
165 vsock_core_unregister(&loopback_transp 165 vsock_core_unregister(&loopback_transport.transport);
166 166
167 flush_work(&vsock->pkt_work); 167 flush_work(&vsock->pkt_work);
168 168
169 virtio_vsock_skb_queue_purge(&vsock->p 169 virtio_vsock_skb_queue_purge(&vsock->pkt_queue);
170 170
171 destroy_workqueue(vsock->workqueue); 171 destroy_workqueue(vsock->workqueue);
172 } 172 }
173 173
174 module_init(vsock_loopback_init); 174 module_init(vsock_loopback_init);
175 module_exit(vsock_loopback_exit); 175 module_exit(vsock_loopback_exit);
176 MODULE_LICENSE("GPL v2"); 176 MODULE_LICENSE("GPL v2");
177 MODULE_AUTHOR("Stefano Garzarella <sgarzare@re 177 MODULE_AUTHOR("Stefano Garzarella <sgarzare@redhat.com>");
178 MODULE_DESCRIPTION("loopback transport for vso 178 MODULE_DESCRIPTION("loopback transport for vsock");
179 MODULE_ALIAS_NETPROTO(PF_VSOCK); 179 MODULE_ALIAS_NETPROTO(PF_VSOCK);
180 180
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