From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760818AbdEOUkJ (ORCPT ); Mon, 15 May 2017 16:40:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:58558 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934204AbdEOUgP (ORCPT ); Mon, 15 May 2017 16:36:15 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C48A5239BA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=sstabellini@kernel.org From: Stefano Stabellini To: xen-devel@lists.xen.org Cc: linux-kernel@vger.kernel.org, sstabellini@kernel.org, jgross@suse.com, boris.ostrovsky@oracle.com, Stefano Stabellini Subject: [PATCH 05/18] xen/pvcalls: connect to a frontend Date: Mon, 15 May 2017 13:35:57 -0700 Message-Id: <1494880570-14209-5-git-send-email-sstabellini@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1494880570-14209-1-git-send-email-sstabellini@kernel.org> References: <1494880570-14209-1-git-send-email-sstabellini@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce a per-frontend data structure named pvcalls_back_priv. It contains pointers to the command ring, its event channel, a list of active sockets and a tree of passive sockets (passing sockets need to be looked up from the id on listen, accept and poll commands, while active sockets only on release). It also has an unbound workqueue to schedule the work of parsing and executing commands on the command ring. pvcallss_lock protects the two lists. In pvcalls_back_global, keep a list of connected frontends. Signed-off-by: Stefano Stabellini CC: boris.ostrovsky@oracle.com CC: jgross@suse.com --- drivers/xen/pvcalls-back.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c index 86eca19..876e577 100644 --- a/drivers/xen/pvcalls-back.c +++ b/drivers/xen/pvcalls-back.c @@ -44,13 +44,100 @@ struct pvcalls_back_global { struct rw_semaphore privs_lock; } pvcalls_back_global; +struct pvcalls_back_priv { + struct list_head list; + struct xenbus_device *dev; + struct xen_pvcalls_sring *sring; + struct xen_pvcalls_back_ring ring; + int irq; + struct list_head socket_mappings; + struct radix_tree_root socketpass_mappings; + struct rw_semaphore pvcallss_lock; + atomic_t work; + struct workqueue_struct *wq; + struct work_struct register_work; +}; + static void pvcalls_back_ioworker(struct work_struct *work) { } +static void pvcalls_back_work(struct work_struct *work) +{ +} + +static irqreturn_t pvcalls_back_event(int irq, void *dev_id) +{ + return IRQ_HANDLED; +} + static int backend_connect(struct xenbus_device *dev) { + int err, evtchn; + grant_ref_t ring_ref; + void *addr = NULL; + struct pvcalls_back_priv *priv = NULL; + + priv = kzalloc(sizeof(struct pvcalls_back_priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + err = xenbus_scanf(XBT_NIL, dev->otherend, "port", "%u", + &evtchn); + if (err != 1) { + err = -EINVAL; + xenbus_dev_fatal(dev, err, "reading %s/event-channel", + dev->otherend); + goto error; + } + + err = xenbus_scanf(XBT_NIL, dev->otherend, "ring-ref", "%u", &ring_ref); + if (err != 1) { + err = -EINVAL; + xenbus_dev_fatal(dev, err, "reading %s/ring-ref", + dev->otherend); + goto error; + } + + err = xenbus_map_ring_valloc(dev, &ring_ref, 1, &addr); + if (err < 0) + goto error; + + err = bind_interdomain_evtchn_to_irqhandler(dev->otherend_id, evtchn, + pvcalls_back_event, 0, + "pvcalls-backend", dev); + if (err < 0) + goto error; + + priv->wq = alloc_workqueue("pvcalls_back_wq", WQ_UNBOUND, 1); + if (!priv->wq) { + err = -ENOMEM; + goto error; + } + INIT_WORK(&priv->register_work, pvcalls_back_work); + priv->dev = dev; + priv->sring = addr; + BACK_RING_INIT(&priv->ring, priv->sring, XEN_PAGE_SIZE * 1); + priv->irq = err; + INIT_LIST_HEAD(&priv->socket_mappings); + INIT_RADIX_TREE(&priv->socketpass_mappings, GFP_KERNEL); + init_rwsem(&priv->pvcallss_lock); + dev_set_drvdata(&dev->dev, priv); + down_write(&pvcalls_back_global.privs_lock); + list_add_tail(&priv->list, &pvcalls_back_global.privs); + up_write(&pvcalls_back_global.privs_lock); + queue_work(priv->wq, &priv->register_work); + return 0; + + error: + if (addr != NULL) + xenbus_unmap_ring_vfree(dev, addr); + if (priv->wq) + destroy_workqueue(priv->wq); + unbind_from_irqhandler(priv->irq, dev); + kfree(priv); + return err; } static int backend_disconnect(struct xenbus_device *dev) -- 1.9.1