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authorStefano Stabellini <sstabellini@kernel.org>2017-10-30 23:40:56 +0100
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2017-10-31 14:05:53 +0100
commit67ea9893cbc2f892f491ec620d6bbab262b80770 (patch)
tree6325a0e93ef322425acd5d0d113190ad329fc1ac /drivers/xen
parentxen/pvcalls: implement connect command (diff)
downloadlinux-67ea9893cbc2f892f491ec620d6bbab262b80770.tar.xz
linux-67ea9893cbc2f892f491ec620d6bbab262b80770.zip
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>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/pvcalls-front.c66
-rw-r--r--drivers/xen/pvcalls-front.h3
2 files changed, 69 insertions, 0 deletions
diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index 8d4a43e6aa46..6e70ec3ea796 100644
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -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" },
{ "" }
diff --git a/drivers/xen/pvcalls-front.h b/drivers/xen/pvcalls-front.h
index 63b0417c31d3..8b0a2749d4b8 100644
--- a/drivers/xen/pvcalls-front.h
+++ b/drivers/xen/pvcalls-front.h
@@ -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