1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_VIRTIO_VSOCK_H 3 #define _LINUX_VIRTIO_VSOCK_H 4 5 #include <uapi/linux/virtio_vsock.h> 6 #include <linux/socket.h> 7 #include <net/sock.h> 8 #include <net/af_vsock.h> 9 10 #define VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE 128 11 #define VIRTIO_VSOCK_DEFAULT_BUF_SIZE (1024 * 256) 12 #define VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE (1024 * 256) 13 #define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE (1024 * 4) 14 #define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL 15 #define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64) 16 17 enum { 18 VSOCK_VQ_RX = 0, /* for host to guest data */ 19 VSOCK_VQ_TX = 1, /* for guest to host data */ 20 VSOCK_VQ_EVENT = 2, 21 VSOCK_VQ_MAX = 3, 22 }; 23 24 /* Per-socket state (accessed via vsk->trans) */ 25 struct virtio_vsock_sock { 26 struct vsock_sock *vsk; 27 28 /* Protected by lock_sock(sk_vsock(trans->vsk)) */ 29 u32 buf_size; 30 u32 buf_size_min; 31 u32 buf_size_max; 32 33 spinlock_t tx_lock; 34 spinlock_t rx_lock; 35 36 /* Protected by tx_lock */ 37 u32 tx_cnt; 38 u32 peer_fwd_cnt; 39 u32 peer_buf_alloc; 40 41 /* Protected by rx_lock */ 42 u32 fwd_cnt; 43 u32 last_fwd_cnt; 44 u32 rx_bytes; 45 u32 buf_alloc; 46 struct list_head rx_queue; 47 }; 48 49 struct virtio_vsock_pkt { 50 struct virtio_vsock_hdr hdr; 51 struct list_head list; 52 /* socket refcnt not held, only use for cancellation */ 53 struct vsock_sock *vsk; 54 void *buf; 55 u32 buf_len; 56 u32 len; 57 u32 off; 58 bool reply; 59 }; 60 61 struct virtio_vsock_pkt_info { 62 u32 remote_cid, remote_port; 63 struct vsock_sock *vsk; 64 struct msghdr *msg; 65 u32 pkt_len; 66 u16 type; 67 u16 op; 68 u32 flags; 69 bool reply; 70 }; 71 72 struct virtio_transport { 73 /* This must be the first field */ 74 struct vsock_transport transport; 75 76 /* Takes ownership of the packet */ 77 int (*send_pkt)(struct virtio_vsock_pkt *pkt); 78 }; 79 80 ssize_t 81 virtio_transport_stream_dequeue(struct vsock_sock *vsk, 82 struct msghdr *msg, 83 size_t len, 84 int type); 85 int 86 virtio_transport_dgram_dequeue(struct vsock_sock *vsk, 87 struct msghdr *msg, 88 size_t len, int flags); 89 90 s64 virtio_transport_stream_has_data(struct vsock_sock *vsk); 91 s64 virtio_transport_stream_has_space(struct vsock_sock *vsk); 92 93 int virtio_transport_do_socket_init(struct vsock_sock *vsk, 94 struct vsock_sock *psk); 95 u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk); 96 u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk); 97 u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk); 98 void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val); 99 void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val); 100 void virtio_transport_set_max_buffer_size(struct vsock_sock *vs, u64 val); 101 int 102 virtio_transport_notify_poll_in(struct vsock_sock *vsk, 103 size_t target, 104 bool *data_ready_now); 105 int 106 virtio_transport_notify_poll_out(struct vsock_sock *vsk, 107 size_t target, 108 bool *space_available_now); 109 110 int virtio_transport_notify_recv_init(struct vsock_sock *vsk, 111 size_t target, struct vsock_transport_recv_notify_data *data); 112 int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk, 113 size_t target, struct vsock_transport_recv_notify_data *data); 114 int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk, 115 size_t target, struct vsock_transport_recv_notify_data *data); 116 int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk, 117 size_t target, ssize_t copied, bool data_read, 118 struct vsock_transport_recv_notify_data *data); 119 int virtio_transport_notify_send_init(struct vsock_sock *vsk, 120 struct vsock_transport_send_notify_data *data); 121 int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk, 122 struct vsock_transport_send_notify_data *data); 123 int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk, 124 struct vsock_transport_send_notify_data *data); 125 int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk, 126 ssize_t written, struct vsock_transport_send_notify_data *data); 127 128 u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk); 129 bool virtio_transport_stream_is_active(struct vsock_sock *vsk); 130 bool virtio_transport_stream_allow(u32 cid, u32 port); 131 int virtio_transport_dgram_bind(struct vsock_sock *vsk, 132 struct sockaddr_vm *addr); 133 bool virtio_transport_dgram_allow(u32 cid, u32 port); 134 135 int virtio_transport_connect(struct vsock_sock *vsk); 136 137 int virtio_transport_shutdown(struct vsock_sock *vsk, int mode); 138 139 void virtio_transport_release(struct vsock_sock *vsk); 140 141 ssize_t 142 virtio_transport_stream_enqueue(struct vsock_sock *vsk, 143 struct msghdr *msg, 144 size_t len); 145 int 146 virtio_transport_dgram_enqueue(struct vsock_sock *vsk, 147 struct sockaddr_vm *remote_addr, 148 struct msghdr *msg, 149 size_t len); 150 151 void virtio_transport_destruct(struct vsock_sock *vsk); 152 153 void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt); 154 void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt); 155 void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt); 156 u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted); 157 void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit); 158 void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt); 159 160 #endif /* _LINUX_VIRTIO_VSOCK_H */ 161
