VSOCK: Introduce virtio_transport.ko
VM sockets virtio transport implementation. This driver runs in the guest. Signed-off-by: Asias He <asias@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Asias He
Michael S. Tsirkin
parent
06a8fc7836
commit
0ea9e1d3a9
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@ -12147,6 +12147,7 @@ S: Maintained
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F: include/linux/virtio_vsock.h
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F: include/uapi/linux/virtio_vsock.h
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F: net/vmw_vsock/virtio_transport_common.c
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F: net/vmw_vsock/virtio_transport.c
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VIRTUAL SERIO DEVICE DRIVER
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M: Stephen Chandler Paul <thatslyude@gmail.com>
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@ -0,0 +1,624 @@
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/*
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* virtio transport for vsock
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*
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* Copyright (C) 2013-2015 Red Hat, Inc.
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* Author: Asias He <asias@redhat.com>
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* Stefan Hajnoczi <stefanha@redhat.com>
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*
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* Some of the code is take from Gerd Hoffmann <kraxel@redhat.com>'s
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* early virtio-vsock proof-of-concept bits.
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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*/
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/atomic.h>
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#include <linux/virtio.h>
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#include <linux/virtio_ids.h>
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#include <linux/virtio_config.h>
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#include <linux/virtio_vsock.h>
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#include <net/sock.h>
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#include <linux/mutex.h>
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#include <net/af_vsock.h>
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static struct workqueue_struct *virtio_vsock_workqueue;
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static struct virtio_vsock *the_virtio_vsock;
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static DEFINE_MUTEX(the_virtio_vsock_mutex); /* protects the_virtio_vsock */
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struct virtio_vsock {
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struct virtio_device *vdev;
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struct virtqueue *vqs[VSOCK_VQ_MAX];
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/* Virtqueue processing is deferred to a workqueue */
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struct work_struct tx_work;
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struct work_struct rx_work;
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struct work_struct event_work;
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/* The following fields are protected by tx_lock. vqs[VSOCK_VQ_TX]
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* must be accessed with tx_lock held.
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*/
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struct mutex tx_lock;
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struct work_struct send_pkt_work;
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spinlock_t send_pkt_list_lock;
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struct list_head send_pkt_list;
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atomic_t queued_replies;
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/* The following fields are protected by rx_lock. vqs[VSOCK_VQ_RX]
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* must be accessed with rx_lock held.
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*/
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struct mutex rx_lock;
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int rx_buf_nr;
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int rx_buf_max_nr;
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/* The following fields are protected by event_lock.
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* vqs[VSOCK_VQ_EVENT] must be accessed with event_lock held.
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*/
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struct mutex event_lock;
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struct virtio_vsock_event event_list[8];
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u32 guest_cid;
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};
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static struct virtio_vsock *virtio_vsock_get(void)
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{
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return the_virtio_vsock;
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}
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static u32 virtio_transport_get_local_cid(void)
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{
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struct virtio_vsock *vsock = virtio_vsock_get();
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return vsock->guest_cid;
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}
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static void
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virtio_transport_send_pkt_work(struct work_struct *work)
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{
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struct virtio_vsock *vsock =
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container_of(work, struct virtio_vsock, send_pkt_work);
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struct virtqueue *vq;
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bool added = false;
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bool restart_rx = false;
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mutex_lock(&vsock->tx_lock);
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vq = vsock->vqs[VSOCK_VQ_TX];
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/* Avoid unnecessary interrupts while we're processing the ring */
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virtqueue_disable_cb(vq);
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for (;;) {
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struct virtio_vsock_pkt *pkt;
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struct scatterlist hdr, buf, *sgs[2];
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int ret, in_sg = 0, out_sg = 0;
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bool reply;
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spin_lock_bh(&vsock->send_pkt_list_lock);
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if (list_empty(&vsock->send_pkt_list)) {
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spin_unlock_bh(&vsock->send_pkt_list_lock);
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virtqueue_enable_cb(vq);
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break;
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}
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pkt = list_first_entry(&vsock->send_pkt_list,
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struct virtio_vsock_pkt, list);
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list_del_init(&pkt->list);
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spin_unlock_bh(&vsock->send_pkt_list_lock);
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reply = pkt->reply;
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sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
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sgs[out_sg++] = &hdr;
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if (pkt->buf) {
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sg_init_one(&buf, pkt->buf, pkt->len);
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sgs[out_sg++] = &buf;
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}
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ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt, GFP_KERNEL);
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if (ret < 0) {
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spin_lock_bh(&vsock->send_pkt_list_lock);
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list_add(&pkt->list, &vsock->send_pkt_list);
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spin_unlock_bh(&vsock->send_pkt_list_lock);
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if (!virtqueue_enable_cb(vq) && ret == -ENOSPC)
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continue; /* retry now that we have more space */
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break;
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}
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if (reply) {
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struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX];
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int val;
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val = atomic_dec_return(&vsock->queued_replies);
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/* Do we now have resources to resume rx processing? */
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if (val + 1 == virtqueue_get_vring_size(rx_vq))
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restart_rx = true;
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}
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added = true;
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}
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if (added)
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virtqueue_kick(vq);
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mutex_unlock(&vsock->tx_lock);
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if (restart_rx)
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queue_work(virtio_vsock_workqueue, &vsock->rx_work);
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}
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static int
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virtio_transport_send_pkt(struct virtio_vsock_pkt *pkt)
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{
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struct virtio_vsock *vsock;
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int len = pkt->len;
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vsock = virtio_vsock_get();
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if (!vsock) {
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virtio_transport_free_pkt(pkt);
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return -ENODEV;
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}
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if (pkt->reply)
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atomic_inc(&vsock->queued_replies);
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spin_lock_bh(&vsock->send_pkt_list_lock);
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list_add_tail(&pkt->list, &vsock->send_pkt_list);
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spin_unlock_bh(&vsock->send_pkt_list_lock);
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queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
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return len;
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}
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static void virtio_vsock_rx_fill(struct virtio_vsock *vsock)
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{
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int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
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struct virtio_vsock_pkt *pkt;
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struct scatterlist hdr, buf, *sgs[2];
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struct virtqueue *vq;
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int ret;
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vq = vsock->vqs[VSOCK_VQ_RX];
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do {
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pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
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if (!pkt)
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break;
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pkt->buf = kmalloc(buf_len, GFP_KERNEL);
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if (!pkt->buf) {
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virtio_transport_free_pkt(pkt);
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break;
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}
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pkt->len = buf_len;
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sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr));
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sgs[0] = &hdr;
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sg_init_one(&buf, pkt->buf, buf_len);
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sgs[1] = &buf;
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ret = virtqueue_add_sgs(vq, sgs, 0, 2, pkt, GFP_KERNEL);
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if (ret) {
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virtio_transport_free_pkt(pkt);
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break;
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}
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vsock->rx_buf_nr++;
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} while (vq->num_free);
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if (vsock->rx_buf_nr > vsock->rx_buf_max_nr)
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vsock->rx_buf_max_nr = vsock->rx_buf_nr;
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virtqueue_kick(vq);
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}
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static void virtio_transport_tx_work(struct work_struct *work)
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{
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struct virtio_vsock *vsock =
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container_of(work, struct virtio_vsock, tx_work);
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struct virtqueue *vq;
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bool added = false;
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vq = vsock->vqs[VSOCK_VQ_TX];
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mutex_lock(&vsock->tx_lock);
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do {
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struct virtio_vsock_pkt *pkt;
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unsigned int len;
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virtqueue_disable_cb(vq);
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while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) {
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virtio_transport_free_pkt(pkt);
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added = true;
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}
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} while (!virtqueue_enable_cb(vq));
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mutex_unlock(&vsock->tx_lock);
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if (added)
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queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work);
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}
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/* Is there space left for replies to rx packets? */
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static bool virtio_transport_more_replies(struct virtio_vsock *vsock)
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{
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struct virtqueue *vq = vsock->vqs[VSOCK_VQ_RX];
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int val;
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smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */
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val = atomic_read(&vsock->queued_replies);
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return val < virtqueue_get_vring_size(vq);
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}
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static void virtio_transport_rx_work(struct work_struct *work)
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{
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struct virtio_vsock *vsock =
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container_of(work, struct virtio_vsock, rx_work);
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struct virtqueue *vq;
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vq = vsock->vqs[VSOCK_VQ_RX];
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mutex_lock(&vsock->rx_lock);
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do {
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virtqueue_disable_cb(vq);
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for (;;) {
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struct virtio_vsock_pkt *pkt;
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unsigned int len;
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if (!virtio_transport_more_replies(vsock)) {
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/* Stop rx until the device processes already
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* pending replies. Leave rx virtqueue
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* callbacks disabled.
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*/
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goto out;
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}
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pkt = virtqueue_get_buf(vq, &len);
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if (!pkt) {
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break;
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}
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vsock->rx_buf_nr--;
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/* Drop short/long packets */
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if (unlikely(len < sizeof(pkt->hdr) ||
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len > sizeof(pkt->hdr) + pkt->len)) {
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virtio_transport_free_pkt(pkt);
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continue;
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}
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pkt->len = len - sizeof(pkt->hdr);
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virtio_transport_recv_pkt(pkt);
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}
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} while (!virtqueue_enable_cb(vq));
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out:
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if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2)
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virtio_vsock_rx_fill(vsock);
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mutex_unlock(&vsock->rx_lock);
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}
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/* event_lock must be held */
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static int virtio_vsock_event_fill_one(struct virtio_vsock *vsock,
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struct virtio_vsock_event *event)
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{
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struct scatterlist sg;
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struct virtqueue *vq;
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vq = vsock->vqs[VSOCK_VQ_EVENT];
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sg_init_one(&sg, event, sizeof(*event));
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return virtqueue_add_inbuf(vq, &sg, 1, event, GFP_KERNEL);
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}
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/* event_lock must be held */
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static void virtio_vsock_event_fill(struct virtio_vsock *vsock)
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{
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size_t i;
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for (i = 0; i < ARRAY_SIZE(vsock->event_list); i++) {
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struct virtio_vsock_event *event = &vsock->event_list[i];
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virtio_vsock_event_fill_one(vsock, event);
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}
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virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]);
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}
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static void virtio_vsock_reset_sock(struct sock *sk)
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{
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lock_sock(sk);
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sk->sk_state = SS_UNCONNECTED;
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sk->sk_err = ECONNRESET;
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sk->sk_error_report(sk);
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release_sock(sk);
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}
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static void virtio_vsock_update_guest_cid(struct virtio_vsock *vsock)
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{
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struct virtio_device *vdev = vsock->vdev;
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u64 guest_cid;
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vdev->config->get(vdev, offsetof(struct virtio_vsock_config, guest_cid),
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&guest_cid, sizeof(guest_cid));
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vsock->guest_cid = le64_to_cpu(guest_cid);
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}
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/* event_lock must be held */
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static void virtio_vsock_event_handle(struct virtio_vsock *vsock,
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struct virtio_vsock_event *event)
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{
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switch (le32_to_cpu(event->id)) {
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case VIRTIO_VSOCK_EVENT_TRANSPORT_RESET:
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virtio_vsock_update_guest_cid(vsock);
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vsock_for_each_connected_socket(virtio_vsock_reset_sock);
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break;
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}
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}
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static void virtio_transport_event_work(struct work_struct *work)
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{
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struct virtio_vsock *vsock =
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container_of(work, struct virtio_vsock, event_work);
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struct virtqueue *vq;
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vq = vsock->vqs[VSOCK_VQ_EVENT];
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mutex_lock(&vsock->event_lock);
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do {
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struct virtio_vsock_event *event;
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unsigned int len;
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virtqueue_disable_cb(vq);
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while ((event = virtqueue_get_buf(vq, &len)) != NULL) {
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if (len == sizeof(*event))
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virtio_vsock_event_handle(vsock, event);
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virtio_vsock_event_fill_one(vsock, event);
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}
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} while (!virtqueue_enable_cb(vq));
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virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]);
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mutex_unlock(&vsock->event_lock);
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}
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static void virtio_vsock_event_done(struct virtqueue *vq)
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{
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struct virtio_vsock *vsock = vq->vdev->priv;
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if (!vsock)
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return;
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queue_work(virtio_vsock_workqueue, &vsock->event_work);
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}
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static void virtio_vsock_tx_done(struct virtqueue *vq)
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{
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struct virtio_vsock *vsock = vq->vdev->priv;
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if (!vsock)
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return;
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queue_work(virtio_vsock_workqueue, &vsock->tx_work);
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}
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static void virtio_vsock_rx_done(struct virtqueue *vq)
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{
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struct virtio_vsock *vsock = vq->vdev->priv;
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if (!vsock)
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return;
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queue_work(virtio_vsock_workqueue, &vsock->rx_work);
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}
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static struct virtio_transport virtio_transport = {
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.transport = {
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.get_local_cid = virtio_transport_get_local_cid,
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.init = virtio_transport_do_socket_init,
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.destruct = virtio_transport_destruct,
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.release = virtio_transport_release,
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.connect = virtio_transport_connect,
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.shutdown = virtio_transport_shutdown,
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.dgram_bind = virtio_transport_dgram_bind,
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.dgram_dequeue = virtio_transport_dgram_dequeue,
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.dgram_enqueue = virtio_transport_dgram_enqueue,
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.dgram_allow = virtio_transport_dgram_allow,
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.stream_dequeue = virtio_transport_stream_dequeue,
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.stream_enqueue = virtio_transport_stream_enqueue,
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.stream_has_data = virtio_transport_stream_has_data,
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.stream_has_space = virtio_transport_stream_has_space,
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.stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
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.stream_is_active = virtio_transport_stream_is_active,
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.stream_allow = virtio_transport_stream_allow,
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.notify_poll_in = virtio_transport_notify_poll_in,
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.notify_poll_out = virtio_transport_notify_poll_out,
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.notify_recv_init = virtio_transport_notify_recv_init,
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.notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
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.notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
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.notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
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.notify_send_init = virtio_transport_notify_send_init,
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.notify_send_pre_block = virtio_transport_notify_send_pre_block,
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.notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
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.notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
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.set_buffer_size = virtio_transport_set_buffer_size,
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.set_min_buffer_size = virtio_transport_set_min_buffer_size,
|
||||
.set_max_buffer_size = virtio_transport_set_max_buffer_size,
|
||||
.get_buffer_size = virtio_transport_get_buffer_size,
|
||||
.get_min_buffer_size = virtio_transport_get_min_buffer_size,
|
||||
.get_max_buffer_size = virtio_transport_get_max_buffer_size,
|
||||
},
|
||||
|
||||
.send_pkt = virtio_transport_send_pkt,
|
||||
};
|
||||
|
||||
static int virtio_vsock_probe(struct virtio_device *vdev)
|
||||
{
|
||||
vq_callback_t *callbacks[] = {
|
||||
virtio_vsock_rx_done,
|
||||
virtio_vsock_tx_done,
|
||||
virtio_vsock_event_done,
|
||||
};
|
||||
static const char * const names[] = {
|
||||
"rx",
|
||||
"tx",
|
||||
"event",
|
||||
};
|
||||
struct virtio_vsock *vsock = NULL;
|
||||
int ret;
|
||||
|
||||
ret = mutex_lock_interruptible(&the_virtio_vsock_mutex);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Only one virtio-vsock device per guest is supported */
|
||||
if (the_virtio_vsock) {
|
||||
ret = -EBUSY;
|
||||
goto out;
|
||||
}
|
||||
|
||||
vsock = kzalloc(sizeof(*vsock), GFP_KERNEL);
|
||||
if (!vsock) {
|
||||
ret = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
vsock->vdev = vdev;
|
||||
|
||||
ret = vsock->vdev->config->find_vqs(vsock->vdev, VSOCK_VQ_MAX,
|
||||
vsock->vqs, callbacks, names);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
virtio_vsock_update_guest_cid(vsock);
|
||||
|
||||
ret = vsock_core_init(&virtio_transport.transport);
|
||||
if (ret < 0)
|
||||
goto out_vqs;
|
||||
|
||||
vsock->rx_buf_nr = 0;
|
||||
vsock->rx_buf_max_nr = 0;
|
||||
atomic_set(&vsock->queued_replies, 0);
|
||||
|
||||
vdev->priv = vsock;
|
||||
the_virtio_vsock = vsock;
|
||||
mutex_init(&vsock->tx_lock);
|
||||
mutex_init(&vsock->rx_lock);
|
||||
mutex_init(&vsock->event_lock);
|
||||
spin_lock_init(&vsock->send_pkt_list_lock);
|
||||
INIT_LIST_HEAD(&vsock->send_pkt_list);
|
||||
INIT_WORK(&vsock->rx_work, virtio_transport_rx_work);
|
||||
INIT_WORK(&vsock->tx_work, virtio_transport_tx_work);
|
||||
INIT_WORK(&vsock->event_work, virtio_transport_event_work);
|
||||
INIT_WORK(&vsock->send_pkt_work, virtio_transport_send_pkt_work);
|
||||
|
||||
mutex_lock(&vsock->rx_lock);
|
||||
virtio_vsock_rx_fill(vsock);
|
||||
mutex_unlock(&vsock->rx_lock);
|
||||
|
||||
mutex_lock(&vsock->event_lock);
|
||||
virtio_vsock_event_fill(vsock);
|
||||
mutex_unlock(&vsock->event_lock);
|
||||
|
||||
mutex_unlock(&the_virtio_vsock_mutex);
|
||||
return 0;
|
||||
|
||||
out_vqs:
|
||||
vsock->vdev->config->del_vqs(vsock->vdev);
|
||||
out:
|
||||
kfree(vsock);
|
||||
mutex_unlock(&the_virtio_vsock_mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void virtio_vsock_remove(struct virtio_device *vdev)
|
||||
{
|
||||
struct virtio_vsock *vsock = vdev->priv;
|
||||
struct virtio_vsock_pkt *pkt;
|
||||
|
||||
flush_work(&vsock->rx_work);
|
||||
flush_work(&vsock->tx_work);
|
||||
flush_work(&vsock->event_work);
|
||||
flush_work(&vsock->send_pkt_work);
|
||||
|
||||
vdev->config->reset(vdev);
|
||||
|
||||
mutex_lock(&vsock->rx_lock);
|
||||
while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_RX])))
|
||||
virtio_transport_free_pkt(pkt);
|
||||
mutex_unlock(&vsock->rx_lock);
|
||||
|
||||
mutex_lock(&vsock->tx_lock);
|
||||
while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_TX])))
|
||||
virtio_transport_free_pkt(pkt);
|
||||
mutex_unlock(&vsock->tx_lock);
|
||||
|
||||
spin_lock_bh(&vsock->send_pkt_list_lock);
|
||||
while (!list_empty(&vsock->send_pkt_list)) {
|
||||
pkt = list_first_entry(&vsock->send_pkt_list,
|
||||
struct virtio_vsock_pkt, list);
|
||||
list_del(&pkt->list);
|
||||
virtio_transport_free_pkt(pkt);
|
||||
}
|
||||
spin_unlock_bh(&vsock->send_pkt_list_lock);
|
||||
|
||||
mutex_lock(&the_virtio_vsock_mutex);
|
||||
the_virtio_vsock = NULL;
|
||||
vsock_core_exit();
|
||||
mutex_unlock(&the_virtio_vsock_mutex);
|
||||
|
||||
vdev->config->del_vqs(vdev);
|
||||
|
||||
kfree(vsock);
|
||||
}
|
||||
|
||||
static struct virtio_device_id id_table[] = {
|
||||
{ VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID },
|
||||
{ 0 },
|
||||
};
|
||||
|
||||
static unsigned int features[] = {
|
||||
};
|
||||
|
||||
static struct virtio_driver virtio_vsock_driver = {
|
||||
.feature_table = features,
|
||||
.feature_table_size = ARRAY_SIZE(features),
|
||||
.driver.name = KBUILD_MODNAME,
|
||||
.driver.owner = THIS_MODULE,
|
||||
.id_table = id_table,
|
||||
.probe = virtio_vsock_probe,
|
||||
.remove = virtio_vsock_remove,
|
||||
};
|
||||
|
||||
static int __init virtio_vsock_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
virtio_vsock_workqueue = alloc_workqueue("virtio_vsock", 0, 0);
|
||||
if (!virtio_vsock_workqueue)
|
||||
return -ENOMEM;
|
||||
ret = register_virtio_driver(&virtio_vsock_driver);
|
||||
if (ret)
|
||||
destroy_workqueue(virtio_vsock_workqueue);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit virtio_vsock_exit(void)
|
||||
{
|
||||
unregister_virtio_driver(&virtio_vsock_driver);
|
||||
destroy_workqueue(virtio_vsock_workqueue);
|
||||
}
|
||||
|
||||
module_init(virtio_vsock_init);
|
||||
module_exit(virtio_vsock_exit);
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_AUTHOR("Asias He");
|
||||
MODULE_DESCRIPTION("virtio transport for vsock");
|
||||
MODULE_DEVICE_TABLE(virtio, id_table);
|
||||
Loading…
Reference in New Issue