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xen/pvcalls: implement bind command 

Allocate a socket. Track the allocated passive sockets with a new data
structure named sockpass_mapping. It contains an unbound workqueue to
schedule delayed work for the accept and poll commands. It also has a
reqcopy field to be used to store a copy of a request for delayed work.
Reads/writes to it are protected by a lock (the "copy_lock" spinlock).
Initialize the workqueue in pvcalls_back_bind.

Implement the bind command with inet_bind.

The pass_sk_data_ready event handler will be added later.

Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Juergen Gross <jgross@suse.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 2017-07-06 11:01:06 -07:00 committed by Boris Ostrovsky
parent 5db4d286a8
commit 331a63e6f8
1 changed files with 79 additions and 0 deletions
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79
drivers/xen/pvcalls-back.c
View File

@ -78,6 +78,18 @@ struct sock_mapping {
struct pvcalls_ioworker ioworker;
};
struct sockpass_mapping {
struct list_head list;
struct pvcalls_fedata *fedata;
struct socket *sock;
uint64_t id;
struct xen_pvcalls_request reqcopy;
spinlock_t copy_lock;
struct workqueue_struct *wq;
struct work_struct register_work;
void (*saved_data_ready)(struct sock *sk);
};
static irqreturn_t pvcalls_back_conn_event(int irq, void *sock_map);
static int pvcalls_back_release_active(struct xenbus_device *dev,
struct pvcalls_fedata *fedata,
@ -268,9 +280,76 @@ static int pvcalls_back_release(struct xenbus_device *dev,
return 0;
}
static void __pvcalls_back_accept(struct work_struct *work)
{
}
static void pvcalls_pass_sk_data_ready(struct sock *sock)
{
}
static int pvcalls_back_bind(struct xenbus_device *dev,
struct xen_pvcalls_request *req)
{
struct pvcalls_fedata *fedata;
int ret;
struct sockpass_mapping *map;
struct xen_pvcalls_response *rsp;
fedata = dev_get_drvdata(&dev->dev);
map = kzalloc(sizeof(*map), GFP_KERNEL);
if (map == NULL) {
ret = -ENOMEM;
goto out;
}
INIT_WORK(&map->register_work, __pvcalls_back_accept);
spin_lock_init(&map->copy_lock);
map->wq = alloc_workqueue("pvcalls_wq", WQ_UNBOUND, 1);
if (!map->wq) {
ret = -ENOMEM;
goto out;
}
ret = sock_create(AF_INET, SOCK_STREAM, 0, &map->sock);
if (ret < 0)
goto out;
ret = inet_bind(map->sock, (struct sockaddr *)&req->u.bind.addr,
req->u.bind.len);
if (ret < 0)
goto out;
map->fedata = fedata;
map->id = req->u.bind.id;
down(&fedata->socket_lock);
ret = radix_tree_insert(&fedata->socketpass_mappings, map->id,
map);
up(&fedata->socket_lock);
if (ret)
goto out;
write_lock_bh(&map->sock->sk->sk_callback_lock);
map->saved_data_ready = map->sock->sk->sk_data_ready;
map->sock->sk->sk_user_data = map;
map->sock->sk->sk_data_ready = pvcalls_pass_sk_data_ready;
write_unlock_bh(&map->sock->sk->sk_callback_lock);
out:
if (ret) {
if (map && map->sock)
sock_release(map->sock);
if (map && map->wq)
destroy_workqueue(map->wq);
kfree(map);
}
rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
rsp->req_id = req->req_id;
rsp->cmd = req->cmd;
rsp->u.bind.id = req->u.bind.id;
rsp->ret = ret;
return 0;
}