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    SubjectRe: [PATCH v1 06/13] xen/pvcalls: implement listen command
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    On 22/07/17 02:11, Stefano Stabellini wrote:
    > Send PVCALLS_LISTEN to the backend.
    >
    > Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
    > CC: boris.ostrovsky@oracle.com
    > CC: jgross@suse.com
    > ---
    > drivers/xen/pvcalls-front.c | 49 +++++++++++++++++++++++++++++++++++++++++++++
    > drivers/xen/pvcalls-front.h | 1 +
    > 2 files changed, 50 insertions(+)
    >
    > diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
    > index 71619bc..80fd5fb 100644
    > --- a/drivers/xen/pvcalls-front.c
    > +++ b/drivers/xen/pvcalls-front.c
    > @@ -361,6 +361,55 @@ int pvcalls_front_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
    > return 0;
    > }
    >
    > +int pvcalls_front_listen(struct socket *sock, int backlog)
    > +{
    > + struct pvcalls_bedata *bedata;
    > + struct sock_mapping *map;
    > + struct xen_pvcalls_request *req;
    > + int notify, req_id, ret;
    > +
    > + if (!pvcalls_front_dev)
    > + return -ENOTCONN;
    > + bedata = dev_get_drvdata(&pvcalls_front_dev->dev);
    > +
    > + map = (struct sock_mapping *) READ_ONCE(sock->sk->sk_send_head);
    > + if (!map)
    > + return -ENOTSOCK;
    > +
    > + if (map->passive.status != PVCALLS_STATUS_BIND)
    > + return -EOPNOTSUPP;
    > +
    > + spin_lock(&bedata->pvcallss_lock);
    > + req_id = bedata->ring.req_prod_pvt & (RING_SIZE(&bedata->ring) - 1);
    > + BUG_ON(req_id >= PVCALLS_NR_REQ_PER_RING);

    BUG_ON() again!


    Juergen

    > + if (RING_FULL(&bedata->ring) ||
    > + bedata->rsp[req_id].req_id != PVCALLS_INVALID_ID) {
    > + spin_unlock(&bedata->pvcallss_lock);
    > + return -EAGAIN;
    > + }
    > + req = RING_GET_REQUEST(&bedata->ring, req_id);
    > + req->req_id = req_id;
    > + req->cmd = PVCALLS_LISTEN;
    > + req->u.listen.id = (uint64_t) sock;
    > + req->u.listen.backlog = backlog;
    > +
    > + bedata->ring.req_prod_pvt++;
    > + RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&bedata->ring, notify);
    > + spin_unlock(&bedata->pvcallss_lock);
    > + if (notify)
    > + notify_remote_via_irq(bedata->irq);
    > +
    > + wait_event(bedata->inflight_req,
    > + READ_ONCE(bedata->rsp[req_id].req_id) == req_id);
    > +
    > + map->passive.status = PVCALLS_STATUS_LISTEN;
    > + ret = bedata->rsp[req_id].ret;
    > + /* read ret, then set this rsp slot to be reused */
    > + smp_mb();
    > + WRITE_ONCE(bedata->rsp[req_id].req_id, PVCALLS_INVALID_ID);
    > + return ret;
    > +}
    > +
    > 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 8b0a274..aa8fe10 100644
    > --- a/drivers/xen/pvcalls-front.h
    > +++ b/drivers/xen/pvcalls-front.h
    > @@ -9,5 +9,6 @@ int pvcalls_front_connect(struct socket *sock, struct sockaddr *addr,
    > int pvcalls_front_bind(struct socket *sock,
    > struct sockaddr *addr,
    > int addr_len);
    > +int pvcalls_front_listen(struct socket *sock, int backlog);
    >
    > #endif
    >

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