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0fe1798968
Send credit update message when SO_RCVLOWAT is updated and it is bigger
than number of bytes in rx queue. It is needed, because 'poll()' will
wait until number of bytes in rx queue will be not smaller than
O_RCVLOWAT, so kick sender to send more data. Otherwise mutual hungup
for tx/rx is possible: sender waits for free space and receiver is
waiting data in 'poll()'.
Rename 'set_rcvlowat' callback to 'notify_set_rcvlowat' and set
'sk->sk_rcvlowat' only in one place (i.e. 'vsock_set_rcvlowat'), so the
transport doesn't need to do it.
Fixes: b89d882dc9
("vsock/virtio: reduce credit update messages")
Signed-off-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
174 lines
5.2 KiB
C
174 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* loopback transport for vsock using virtio_transport_common APIs
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*
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* Copyright (C) 2013-2019 Red Hat, Inc.
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* Authors: Asias He <asias@redhat.com>
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* Stefan Hajnoczi <stefanha@redhat.com>
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* Stefano Garzarella <sgarzare@redhat.com>
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*
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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/virtio_vsock.h>
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struct vsock_loopback {
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struct workqueue_struct *workqueue;
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struct sk_buff_head pkt_queue;
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struct work_struct pkt_work;
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};
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static struct vsock_loopback the_vsock_loopback;
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static u32 vsock_loopback_get_local_cid(void)
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{
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return VMADDR_CID_LOCAL;
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}
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static int vsock_loopback_send_pkt(struct sk_buff *skb)
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{
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struct vsock_loopback *vsock = &the_vsock_loopback;
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int len = skb->len;
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virtio_vsock_skb_queue_tail(&vsock->pkt_queue, skb);
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queue_work(vsock->workqueue, &vsock->pkt_work);
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return len;
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}
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static int vsock_loopback_cancel_pkt(struct vsock_sock *vsk)
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{
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struct vsock_loopback *vsock = &the_vsock_loopback;
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virtio_transport_purge_skbs(vsk, &vsock->pkt_queue);
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return 0;
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}
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static bool vsock_loopback_seqpacket_allow(u32 remote_cid);
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static bool vsock_loopback_msgzerocopy_allow(void)
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{
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return true;
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}
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static struct virtio_transport loopback_transport = {
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.transport = {
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.module = THIS_MODULE,
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.get_local_cid = vsock_loopback_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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.cancel_pkt = vsock_loopback_cancel_pkt,
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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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.seqpacket_dequeue = virtio_transport_seqpacket_dequeue,
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.seqpacket_enqueue = virtio_transport_seqpacket_enqueue,
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.seqpacket_allow = vsock_loopback_seqpacket_allow,
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.seqpacket_has_data = virtio_transport_seqpacket_has_data,
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.msgzerocopy_allow = vsock_loopback_msgzerocopy_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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.notify_buffer_size = virtio_transport_notify_buffer_size,
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.notify_set_rcvlowat = virtio_transport_notify_set_rcvlowat,
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.read_skb = virtio_transport_read_skb,
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},
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.send_pkt = vsock_loopback_send_pkt,
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};
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static bool vsock_loopback_seqpacket_allow(u32 remote_cid)
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{
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return true;
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}
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static void vsock_loopback_work(struct work_struct *work)
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{
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struct vsock_loopback *vsock =
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container_of(work, struct vsock_loopback, pkt_work);
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struct sk_buff_head pkts;
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struct sk_buff *skb;
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skb_queue_head_init(&pkts);
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spin_lock_bh(&vsock->pkt_queue.lock);
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skb_queue_splice_init(&vsock->pkt_queue, &pkts);
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spin_unlock_bh(&vsock->pkt_queue.lock);
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while ((skb = __skb_dequeue(&pkts))) {
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virtio_transport_deliver_tap_pkt(skb);
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virtio_transport_recv_pkt(&loopback_transport, skb);
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}
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}
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static int __init vsock_loopback_init(void)
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{
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struct vsock_loopback *vsock = &the_vsock_loopback;
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int ret;
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vsock->workqueue = alloc_workqueue("vsock-loopback", 0, 0);
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if (!vsock->workqueue)
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return -ENOMEM;
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skb_queue_head_init(&vsock->pkt_queue);
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INIT_WORK(&vsock->pkt_work, vsock_loopback_work);
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ret = vsock_core_register(&loopback_transport.transport,
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VSOCK_TRANSPORT_F_LOCAL);
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if (ret)
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goto out_wq;
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return 0;
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out_wq:
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destroy_workqueue(vsock->workqueue);
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return ret;
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}
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static void __exit vsock_loopback_exit(void)
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{
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struct vsock_loopback *vsock = &the_vsock_loopback;
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vsock_core_unregister(&loopback_transport.transport);
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flush_work(&vsock->pkt_work);
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virtio_vsock_skb_queue_purge(&vsock->pkt_queue);
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destroy_workqueue(vsock->workqueue);
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}
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module_init(vsock_loopback_init);
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module_exit(vsock_loopback_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Stefano Garzarella <sgarzare@redhat.com>");
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MODULE_DESCRIPTION("loopback transport for vsock");
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MODULE_ALIAS_NETPROTO(PF_VSOCK);
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