From b1efa69317e5e7e813620af180f262a0fc1db47c Mon Sep 17 00:00:00 2001 From: Stefano Stabellini Date: Thu, 6 Jul 2017 11:00:00 -0700 Subject: xen/pvcalls: handle commands from the frontend When the other end notifies us that there are commands to be read (pvcalls_back_event), wake up the backend thread to parse the command. The command ring works like most other Xen rings, so use the usual ring macros to read and write to it. The functions implementing the commands are empty stubs for now. [ boris: fixed whitespaces ] Signed-off-by: Stefano Stabellini Reviewed-by: Juergen Gross CC: boris.ostrovsky@oracle.com CC: jgross@suse.com Signed-off-by: Boris Ostrovsky --- drivers/xen/pvcalls-back.c | 125 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 125 insertions(+) (limited to 'drivers/xen') diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c index 48b71236192d..a92e81d25f07 100644 --- a/drivers/xen/pvcalls-back.c +++ b/drivers/xen/pvcalls-back.c @@ -49,8 +49,133 @@ struct pvcalls_fedata { struct semaphore socket_lock; }; +static int pvcalls_back_socket(struct xenbus_device *dev, + struct xen_pvcalls_request *req) +{ + return 0; +} + +static int pvcalls_back_connect(struct xenbus_device *dev, + struct xen_pvcalls_request *req) +{ + return 0; +} + +static int pvcalls_back_release(struct xenbus_device *dev, + struct xen_pvcalls_request *req) +{ + return 0; +} + +static int pvcalls_back_bind(struct xenbus_device *dev, + struct xen_pvcalls_request *req) +{ + return 0; +} + +static int pvcalls_back_listen(struct xenbus_device *dev, + struct xen_pvcalls_request *req) +{ + return 0; +} + +static int pvcalls_back_accept(struct xenbus_device *dev, + struct xen_pvcalls_request *req) +{ + return 0; +} + +static int pvcalls_back_poll(struct xenbus_device *dev, + struct xen_pvcalls_request *req) +{ + return 0; +} + +static int pvcalls_back_handle_cmd(struct xenbus_device *dev, + struct xen_pvcalls_request *req) +{ + int ret = 0; + + switch (req->cmd) { + case PVCALLS_SOCKET: + ret = pvcalls_back_socket(dev, req); + break; + case PVCALLS_CONNECT: + ret = pvcalls_back_connect(dev, req); + break; + case PVCALLS_RELEASE: + ret = pvcalls_back_release(dev, req); + break; + case PVCALLS_BIND: + ret = pvcalls_back_bind(dev, req); + break; + case PVCALLS_LISTEN: + ret = pvcalls_back_listen(dev, req); + break; + case PVCALLS_ACCEPT: + ret = pvcalls_back_accept(dev, req); + break; + case PVCALLS_POLL: + ret = pvcalls_back_poll(dev, req); + break; + default: + { + struct pvcalls_fedata *fedata; + struct xen_pvcalls_response *rsp; + + fedata = dev_get_drvdata(&dev->dev); + rsp = RING_GET_RESPONSE( + &fedata->ring, fedata->ring.rsp_prod_pvt++); + rsp->req_id = req->req_id; + rsp->cmd = req->cmd; + rsp->ret = -ENOTSUPP; + break; + } + } + return ret; +} + +static void pvcalls_back_work(struct pvcalls_fedata *fedata) +{ + int notify, notify_all = 0, more = 1; + struct xen_pvcalls_request req; + struct xenbus_device *dev = fedata->dev; + + while (more) { + while (RING_HAS_UNCONSUMED_REQUESTS(&fedata->ring)) { + RING_COPY_REQUEST(&fedata->ring, + fedata->ring.req_cons++, + &req); + + if (!pvcalls_back_handle_cmd(dev, &req)) { + RING_PUSH_RESPONSES_AND_CHECK_NOTIFY( + &fedata->ring, notify); + notify_all += notify; + } + } + + if (notify_all) { + notify_remote_via_irq(fedata->irq); + notify_all = 0; + } + + RING_FINAL_CHECK_FOR_REQUESTS(&fedata->ring, more); + } +} + static irqreturn_t pvcalls_back_event(int irq, void *dev_id) { + struct xenbus_device *dev = dev_id; + struct pvcalls_fedata *fedata = NULL; + + if (dev == NULL) + return IRQ_HANDLED; + + fedata = dev_get_drvdata(&dev->dev); + if (fedata == NULL) + return IRQ_HANDLED; + + pvcalls_back_work(fedata); return IRQ_HANDLED; } -- cgit v1.2.3