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Subject[PATCH v2 09/18] xen/pvcalls: implement bind command
Date
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>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
---
drivers/xen/pvcalls-back.c | 87 +++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 86 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index 65fbc39..d3278bd 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -82,6 +82,18 @@ struct sock_mapping {
struct pvcalls_ioworker ioworker;
};

+struct sockpass_mapping {
+ struct list_head list;
+ struct pvcalls_back_priv *priv;
+ 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_back_priv *priv,
@@ -253,10 +265,83 @@ 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)
{
- return 0;
+ struct pvcalls_back_priv *priv;
+ int ret, err;
+ struct socket *sock;
+ struct sockpass_mapping *map = NULL;
+ struct xen_pvcalls_response *rsp;
+
+ priv = 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;
+ kfree(map);
+ goto out;
+ }
+
+ ret = sock_create(AF_INET, SOCK_STREAM, 0, &sock);
+ if (ret < 0) {
+ destroy_workqueue(map->wq);
+ kfree(map);
+ goto out;
+ }
+
+ ret = inet_bind(sock, (struct sockaddr *)&req->u.bind.addr,
+ req->u.bind.len);
+ if (ret < 0) {
+ destroy_workqueue(map->wq);
+ kfree(map);
+ goto out;
+ }
+
+ map->priv = priv;
+ map->sock = sock;
+ map->id = req->u.bind.id;
+
+ down(&priv->socket_lock);
+ err = radix_tree_insert(&priv->socketpass_mappings, map->id,
+ map);
+ up(&priv->socket_lock);
+ if (err) {
+ ret = err;
+ destroy_workqueue(map->wq);
+ kfree(map);
+ goto out;
+ }
+
+ write_lock_bh(&sock->sk->sk_callback_lock);
+ map->saved_data_ready = sock->sk->sk_data_ready;
+ sock->sk->sk_user_data = map;
+ sock->sk->sk_data_ready = pvcalls_pass_sk_data_ready;
+ write_unlock_bh(&sock->sk->sk_callback_lock);
+
+out:
+ rsp = RING_GET_RESPONSE(&priv->ring, priv->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 ret;
}

static int pvcalls_back_listen(struct xenbus_device *dev,
--
1.9.1
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