diff options
Diffstat (limited to 'include/linux/virtio_vsock.h')
| -rw-r--r-- | include/linux/virtio_vsock.h | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h new file mode 100644 index 000000000000..0c67543a45c8 --- /dev/null +++ b/include/linux/virtio_vsock.h @@ -0,0 +1,291 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_VIRTIO_VSOCK_H +#define _LINUX_VIRTIO_VSOCK_H + +#include <uapi/linux/virtio_vsock.h> +#include <linux/socket.h> +#include <net/sock.h> +#include <net/af_vsock.h> + +#define VIRTIO_VSOCK_SKB_HEADROOM (sizeof(struct virtio_vsock_hdr)) + +struct virtio_vsock_skb_cb { + bool reply; + bool tap_delivered; + u32 offset; +}; + +#define VIRTIO_VSOCK_SKB_CB(skb) ((struct virtio_vsock_skb_cb *)((skb)->cb)) + +static inline struct virtio_vsock_hdr *virtio_vsock_hdr(struct sk_buff *skb) +{ + return (struct virtio_vsock_hdr *)skb->head; +} + +static inline bool virtio_vsock_skb_reply(struct sk_buff *skb) +{ + return VIRTIO_VSOCK_SKB_CB(skb)->reply; +} + +static inline void virtio_vsock_skb_set_reply(struct sk_buff *skb) +{ + VIRTIO_VSOCK_SKB_CB(skb)->reply = true; +} + +static inline bool virtio_vsock_skb_tap_delivered(struct sk_buff *skb) +{ + return VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered; +} + +static inline void virtio_vsock_skb_set_tap_delivered(struct sk_buff *skb) +{ + VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered = true; +} + +static inline void virtio_vsock_skb_clear_tap_delivered(struct sk_buff *skb) +{ + VIRTIO_VSOCK_SKB_CB(skb)->tap_delivered = false; +} + +static inline void virtio_vsock_skb_put(struct sk_buff *skb, u32 len) +{ + DEBUG_NET_WARN_ON_ONCE(skb->len); + + if (skb_is_nonlinear(skb)) + skb->len = len; + else + skb_put(skb, len); +} + +static inline struct sk_buff * +__virtio_vsock_alloc_skb_with_frags(unsigned int header_len, + unsigned int data_len, + gfp_t mask) +{ + struct sk_buff *skb; + int err; + + skb = alloc_skb_with_frags(header_len, data_len, + PAGE_ALLOC_COSTLY_ORDER, &err, mask); + if (!skb) + return NULL; + + skb_reserve(skb, VIRTIO_VSOCK_SKB_HEADROOM); + skb->data_len = data_len; + return skb; +} + +static inline struct sk_buff * +virtio_vsock_alloc_linear_skb(unsigned int size, gfp_t mask) +{ + return __virtio_vsock_alloc_skb_with_frags(size, 0, mask); +} + +static inline struct sk_buff *virtio_vsock_alloc_skb(unsigned int size, gfp_t mask) +{ + if (size <= SKB_WITH_OVERHEAD(PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) + return virtio_vsock_alloc_linear_skb(size, mask); + + size -= VIRTIO_VSOCK_SKB_HEADROOM; + return __virtio_vsock_alloc_skb_with_frags(VIRTIO_VSOCK_SKB_HEADROOM, + size, mask); +} + +static inline void +virtio_vsock_skb_queue_head(struct sk_buff_head *list, struct sk_buff *skb) +{ + spin_lock_bh(&list->lock); + __skb_queue_head(list, skb); + spin_unlock_bh(&list->lock); +} + +static inline void +virtio_vsock_skb_queue_tail(struct sk_buff_head *list, struct sk_buff *skb) +{ + spin_lock_bh(&list->lock); + __skb_queue_tail(list, skb); + spin_unlock_bh(&list->lock); +} + +static inline struct sk_buff *virtio_vsock_skb_dequeue(struct sk_buff_head *list) +{ + struct sk_buff *skb; + + spin_lock_bh(&list->lock); + skb = __skb_dequeue(list); + spin_unlock_bh(&list->lock); + + return skb; +} + +static inline void virtio_vsock_skb_queue_purge(struct sk_buff_head *list) +{ + spin_lock_bh(&list->lock); + __skb_queue_purge(list); + spin_unlock_bh(&list->lock); +} + +static inline size_t virtio_vsock_skb_len(struct sk_buff *skb) +{ + return (size_t)(skb_end_pointer(skb) - skb->head); +} + +/* Dimension the RX SKB so that the entire thing fits exactly into + * a single 4KiB page. This avoids wasting memory due to alloc_skb() + * rounding up to the next page order and also means that we + * don't leave higher-order pages sitting around in the RX queue. + */ +#define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE SKB_WITH_OVERHEAD(1024 * 4) +#define VIRTIO_VSOCK_MAX_BUF_SIZE 0xFFFFFFFFUL +#define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE (1024 * 64) + +enum { + VSOCK_VQ_RX = 0, /* for host to guest data */ + VSOCK_VQ_TX = 1, /* for guest to host data */ + VSOCK_VQ_EVENT = 2, + VSOCK_VQ_MAX = 3, +}; + +/* Per-socket state (accessed via vsk->trans) */ +struct virtio_vsock_sock { + struct vsock_sock *vsk; + + spinlock_t tx_lock; + spinlock_t rx_lock; + + /* Protected by tx_lock */ + u32 tx_cnt; + u32 peer_fwd_cnt; + u32 peer_buf_alloc; + size_t bytes_unsent; + + /* Protected by rx_lock */ + u32 fwd_cnt; + u32 last_fwd_cnt; + u32 rx_bytes; + u32 buf_alloc; + u32 buf_used; + struct sk_buff_head rx_queue; + u32 msg_count; +}; + +struct virtio_vsock_pkt_info { + u32 remote_cid, remote_port; + struct vsock_sock *vsk; + struct msghdr *msg; + u32 pkt_len; + u16 type; + u16 op; + u32 flags; + bool reply; +}; + +struct virtio_transport { + /* This must be the first field */ + struct vsock_transport transport; + + /* Takes ownership of the packet */ + int (*send_pkt)(struct sk_buff *skb); + + /* Used in MSG_ZEROCOPY mode. Checks, that provided data + * (number of buffers) could be transmitted with zerocopy + * mode. If this callback is not implemented for the current + * transport - this means that this transport doesn't need + * extra checks and can perform zerocopy transmission by + * default. + */ + bool (*can_msgzerocopy)(int bufs_num); +}; + +ssize_t +virtio_transport_stream_dequeue(struct vsock_sock *vsk, + struct msghdr *msg, + size_t len, + int type); +int +virtio_transport_dgram_dequeue(struct vsock_sock *vsk, + struct msghdr *msg, + size_t len, int flags); + +int +virtio_transport_seqpacket_enqueue(struct vsock_sock *vsk, + struct msghdr *msg, + size_t len); +ssize_t +virtio_transport_seqpacket_dequeue(struct vsock_sock *vsk, + struct msghdr *msg, + int flags); +s64 virtio_transport_stream_has_data(struct vsock_sock *vsk); +s64 virtio_transport_stream_has_space(struct vsock_sock *vsk); +u32 virtio_transport_seqpacket_has_data(struct vsock_sock *vsk); + +ssize_t virtio_transport_unsent_bytes(struct vsock_sock *vsk); + +void virtio_transport_consume_skb_sent(struct sk_buff *skb, + bool consume); + +int virtio_transport_do_socket_init(struct vsock_sock *vsk, + struct vsock_sock *psk); +int +virtio_transport_notify_poll_in(struct vsock_sock *vsk, + size_t target, + bool *data_ready_now); +int +virtio_transport_notify_poll_out(struct vsock_sock *vsk, + size_t target, + bool *space_available_now); + +int virtio_transport_notify_recv_init(struct vsock_sock *vsk, + size_t target, struct vsock_transport_recv_notify_data *data); +int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk, + size_t target, struct vsock_transport_recv_notify_data *data); +int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk, + size_t target, struct vsock_transport_recv_notify_data *data); +int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk, + size_t target, ssize_t copied, bool data_read, + struct vsock_transport_recv_notify_data *data); +int virtio_transport_notify_send_init(struct vsock_sock *vsk, + struct vsock_transport_send_notify_data *data); +int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk, + struct vsock_transport_send_notify_data *data); +int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk, + struct vsock_transport_send_notify_data *data); +int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk, + ssize_t written, struct vsock_transport_send_notify_data *data); +void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val); + +u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk); +bool virtio_transport_stream_is_active(struct vsock_sock *vsk); +bool virtio_transport_stream_allow(u32 cid, u32 port); +int virtio_transport_dgram_bind(struct vsock_sock *vsk, + struct sockaddr_vm *addr); +bool virtio_transport_dgram_allow(u32 cid, u32 port); + +int virtio_transport_connect(struct vsock_sock *vsk); + +int virtio_transport_shutdown(struct vsock_sock *vsk, int mode); + +void virtio_transport_release(struct vsock_sock *vsk); + +ssize_t +virtio_transport_stream_enqueue(struct vsock_sock *vsk, + struct msghdr *msg, + size_t len); +int +virtio_transport_dgram_enqueue(struct vsock_sock *vsk, + struct sockaddr_vm *remote_addr, + struct msghdr *msg, + size_t len); + +void virtio_transport_destruct(struct vsock_sock *vsk); + +void virtio_transport_recv_pkt(struct virtio_transport *t, + struct sk_buff *skb); +void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct sk_buff *skb); +u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted); +void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit); +void virtio_transport_deliver_tap_pkt(struct sk_buff *skb); +int virtio_transport_purge_skbs(void *vsk, struct sk_buff_head *list); +int virtio_transport_read_skb(struct vsock_sock *vsk, skb_read_actor_t read_actor); +int virtio_transport_notify_set_rcvlowat(struct vsock_sock *vsk, int val); +#endif /* _LINUX_VIRTIO_VSOCK_H */ |