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xen/pvcalls: implement bind command 

Send PVCALLS_BIND to the backend. Introduce a new structure, part of
struct sock_mapping, to store information specific to passive sockets.

Introduce a status field to keep track of the status of the passive
socket.

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 15:40:56 -07:00 committed by Boris Ostrovsky
parent cb1c7d9bbc
commit 67ea9893cb
2 changed files with 69 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
drivers/xen/pvcalls-front.c
View File

@ -70,6 +70,13 @@ struct sock_mapping {
wait_queue_head_t inflight_conn_req;
} active;
struct {
/* Socket status */
#define PVCALLS_STATUS_UNINITALIZED 0
#define PVCALLS_STATUS_BIND 1
#define PVCALLS_STATUS_LISTEN 2
uint8_t status;
} passive;
};
};
@ -346,6 +353,65 @@ int pvcalls_front_connect(struct socket *sock, struct sockaddr *addr,
return ret;
}
int pvcalls_front_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
{
struct pvcalls_bedata *bedata;
struct sock_mapping *map = NULL;
struct xen_pvcalls_request *req;
int notify, req_id, ret;
if (addr->sa_family != AF_INET || sock->type != SOCK_STREAM)
return -EOPNOTSUPP;
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 == NULL) {
pvcalls_exit();
return -ENOTSOCK;
}
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;
map->sock = sock;
req->cmd = PVCALLS_BIND;
req->u.bind.id = (uintptr_t)map;
memcpy(req->u.bind.addr, addr, sizeof(*addr));
req->u.bind.len = addr_len;
map->active_socket = false;
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_BIND;
pvcalls_exit();
return 0;
}
static const struct xenbus_device_id pvcalls_front_ids[] = {
{ "pvcalls" },
{ "" }

3
drivers/xen/pvcalls-front.h
View File

@ -6,5 +6,8 @@
int pvcalls_front_socket(struct socket *sock);
int pvcalls_front_connect(struct socket *sock, struct sockaddr *addr,
int addr_len, int flags);
int pvcalls_front_bind(struct socket *sock,
struct sockaddr *addr,
int addr_len);
#endif