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    Subject[PATCH v5 06/13] xen/pvcalls: implement bind command
    Date
    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>
    CC: boris.ostrovsky@oracle.com
    CC: jgross@suse.com
    ---
    drivers/xen/pvcalls-front.c | 66 +++++++++++++++++++++++++++++++++++++++++++++
    drivers/xen/pvcalls-front.h | 3 +++
    2 files changed, 69 insertions(+)

    diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
    index 7c9261b..4cafd9b 100644
    --- a/drivers/xen/pvcalls-front.c
    +++ b/drivers/xen/pvcalls-front.c
    @@ -71,6 +71,13 @@ 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;
    };
    };

    @@ -347,6 +354,65 @@ 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 -ENOTSUPP;
    +
    + 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 = (uint64_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 63b0417..8b0a274 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
    --
    1.9.1
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