From patchwork Mon Mar 20 18:19:09 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Stabellini X-Patchwork-Id: 741121 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3vn4772lkrz9s0m for ; Tue, 21 Mar 2017 05:22:43 +1100 (AEDT) Received: from localhost ([::1]:34319 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cq1x2-0000DX-PC for incoming@patchwork.ozlabs.org; Mon, 20 Mar 2017 14:22:40 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34490) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cq1tu-0006Xf-46 for qemu-devel@nongnu.org; Mon, 20 Mar 2017 14:19:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cq1ts-0007kA-Tu for qemu-devel@nongnu.org; Mon, 20 Mar 2017 14:19:26 -0400 Received: from mail.kernel.org ([198.145.29.136]:46168) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cq1ts-0007jl-NY for qemu-devel@nongnu.org; Mon, 20 Mar 2017 14:19:24 -0400 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D12E320390; Mon, 20 Mar 2017 18:19:22 +0000 (UTC) Received: from sstabellini-ThinkPad-X260.hsd1.ca.comcast.net (96-82-76-110-static.hfc.comcastbusiness.net [96.82.76.110]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9F5E72038F; Mon, 20 Mar 2017 18:19:21 +0000 (UTC) From: Stefano Stabellini To: qemu-devel@nongnu.org Date: Mon, 20 Mar 2017 11:19:09 -0700 Message-Id: <1490033952-26735-5-git-send-email-sstabellini@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1490033952-26735-1-git-send-email-sstabellini@kernel.org> References: <1490033952-26735-1-git-send-email-sstabellini@kernel.org> X-Virus-Scanned: ClamAV using ClamSMTP X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 198.145.29.136 Subject: [Qemu-devel] [PATCH v4 5/8] xen/9pfs: receive requests from the frontend X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jgross@suse.com, sstabellini@kernel.org, groug@kaod.org, Stefano Stabellini , "Aneesh Kumar K.V" , anthony.perard@citrix.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Upon receiving an event channel notification from the frontend, schedule the bottom half. From the bottom half, read one request from the ring, create a pdu and call pdu_submit to handle it. For now, only handle one request per ring at a time. Signed-off-by: Stefano Stabellini CC: anthony.perard@citrix.com CC: jgross@suse.com CC: Aneesh Kumar K.V CC: Greg Kurz --- hw/9pfs/xen-9p-backend.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c index bb0157b..8222db6 100644 --- a/hw/9pfs/xen-9p-backend.c +++ b/hw/9pfs/xen-9p-backend.c @@ -104,12 +104,62 @@ static int xen_9pfs_init(struct XenDevice *xendev) return 0; } +static int xen_9pfs_receive(Xen9pfsRing *ring) +{ + P9MsgHeader h; + RING_IDX cons, prod, masked_prod, masked_cons; + V9fsPDU *pdu; + + if (ring->inprogress) { + return 0; + } + + cons = ring->intf->out_cons; + prod = ring->intf->out_prod; + xen_rmb(); + + if (xen_9pfs_queued(prod, cons, XEN_FLEX_RING_SIZE(ring->ring_order)) < + sizeof(h)) { + return 0; + } + ring->inprogress = true; + + masked_prod = xen_9pfs_mask(prod, XEN_FLEX_RING_SIZE(ring->ring_order)); + masked_cons = xen_9pfs_mask(cons, XEN_FLEX_RING_SIZE(ring->ring_order)); + + xen_9pfs_read_packet(ring->ring.out, masked_prod, &masked_cons, + XEN_FLEX_RING_SIZE(ring->ring_order), (uint8_t *) &h, + sizeof(h)); + + /* cannot fail, because we only handle one request per ring at a time */ + pdu = pdu_alloc(&ring->priv->state); + pdu->size = le32_to_cpu(h.size_le); + pdu->id = h.id; + pdu->tag = le32_to_cpu(h.tag_le); + ring->out_size = le32_to_cpu(h.size_le); + ring->out_cons = cons + le32_to_cpu(h.size_le); + + qemu_co_queue_init(&pdu->complete); + pdu_submit(pdu); + + return 0; +} + static void xen_9pfs_bh(void *opaque) { + Xen9pfsRing *ring = opaque; + xen_9pfs_receive(ring); } static void xen_9pfs_evtchn_event(void *opaque) { + Xen9pfsRing *ring = opaque; + evtchn_port_t port; + + port = xenevtchn_pending(ring->evtchndev); + xenevtchn_unmask(ring->evtchndev, port); + + qemu_bh_schedule(ring->bh); } static int xen_9pfs_free(struct XenDevice *xendev)