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xen/pvcalls: implement listen command 

Send PVCALLS_LISTEN to the backend.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Stefano Stabellini 2017-10-30 15:40:57 -07:00 committed by Boris Ostrovsky
parent 67ea9893cb
commit 1853f11d72
2 changed files with 58 additions and 0 deletions
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57
drivers/xen/pvcalls-front.c
View File

@ -412,6 +412,63 @@ int pvcalls_front_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
return 0;
}
int pvcalls_front_listen(struct socket *sock, int backlog)
{
struct pvcalls_bedata *bedata;
struct sock_mapping *map;
struct xen_pvcalls_request *req;
int notify, req_id, ret;
pvcalls_enter();
if (!pvcalls_front_dev) {
pvcalls_exit();
return -ENOTCONN;
}
bedata = dev_get_drvdata(&pvcalls_front_dev->dev);
map = (struct sock_mapping *) sock->sk->sk_send_head;
if (!map) {
pvcalls_exit();
return -ENOTSOCK;
}
if (map->passive.status != PVCALLS_STATUS_BIND) {
pvcalls_exit();
return -EOPNOTSUPP;
}
spin_lock(&bedata->socket_lock);
ret = get_request(bedata, &req_id);
if (ret < 0) {
spin_unlock(&bedata->socket_lock);
pvcalls_exit();
return ret;
}
req = RING_GET_REQUEST(&bedata->ring, req_id);
req->req_id = req_id;
req->cmd = PVCALLS_LISTEN;
req->u.listen.id = (uintptr_t) map;
req->u.listen.backlog = backlog;
bedata->ring.req_prod_pvt++;
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&bedata->ring, notify);
spin_unlock(&bedata->socket_lock);
if (notify)
notify_remote_via_irq(bedata->irq);
wait_event(bedata->inflight_req,
READ_ONCE(bedata->rsp[req_id].req_id) == req_id);
/* read req_id, then the content */
smp_rmb();
ret = bedata->rsp[req_id].ret;
bedata->rsp[req_id].req_id = PVCALLS_INVALID_ID;
map->passive.status = PVCALLS_STATUS_LISTEN;
pvcalls_exit();
return ret;
}
static const struct xenbus_device_id pvcalls_front_ids[] = {
{ "pvcalls" },
{ "" }

1
drivers/xen/pvcalls-front.h
View File

@ -9,5 +9,6 @@ int pvcalls_front_connect(struct socket *sock, struct sockaddr *addr,
int pvcalls_front_bind(struct socket *sock,
struct sockaddr *addr,
int addr_len);
int pvcalls_front_listen(struct socket *sock, int backlog);
#endif