From patchwork Mon Mar 13 23:55:57 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Stabellini X-Patchwork-Id: 9622331 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A71D0604CC for ; Mon, 13 Mar 2017 23:58:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 98C7A2851A for ; Mon, 13 Mar 2017 23:58:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8D58D28520; Mon, 13 Mar 2017 23:58:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 171DD2851A for ; Mon, 13 Mar 2017 23:58:22 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cnZp5-0007y4-0t; Mon, 13 Mar 2017 23:56:19 +0000 Received: from mail6.bemta6.messagelabs.com ([193.109.254.103]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cnZp3-0007wn-Df for xen-devel@lists.xenproject.org; Mon, 13 Mar 2017 23:56:17 +0000 Received: from [193.109.254.147] by server-9.bemta-6.messagelabs.com id 97/B9-13095-0A137C85; Mon, 13 Mar 2017 23:56:16 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpnkeJIrShJLcpLzFFi42I5NlG2Q3eB4fE Ig4tvBSy+b5nM5MDocfjDFZYAxijWzLyk/IoE1oxXHS2MBbMEK253bWZvYPzP28XIxSEkMJVR 4tfWxaxdjJxAzkEmiabNpiA2m4ChxN8nm9hAbBEBSYnfXaeZQRqYBe4wSkye0cTYxcjBISzgI tF2gR+khkVAVeLWubUsIDavgJvEvoMPmUBsCQE5iZPHJoPN5xRwl5iy6xgzxOJ2RokzuzawQB RlSMzrmcMKYXtJLLpxCcpWk7h6bhPzBEa+BYwMqxg1ilOLylKLdI3M9ZKKMtMzSnITM3N0DQ3 M9HJTi4sT01NzEpOK9ZLzczcxAgOFAQh2MC5eG3iIUZKDSUmU9/eXQxFCfEn5KZUZicUZ8UWl OanFhxhlODiUJHjTPA9HCAkWpaanVqRl5gBDFiYtwcGjJMLbDpLmLS5IzC3OTIdInWLU5Zgze /cbJiGWvPy8VClx3gSQIgGQoozSPLgRsPi5xCgrJczLCHSUEE9BalFuZgmq/CtGcQ5GJWHeUp ApPJl5JXCbXgEdwQR0xDS+gyBHlCQipKQaGBPSFu+37WE1PsEj1x7kPuPDf9WuruUCnz1OLuN foCuY53r8o2SC3q4Ijsk6osWOjJYJf4+tVrO1/chu/ef8quN/tb5pbOtmNnh6wb9p/8G8ZOt3 guZRO164qmbPklM733K360j8w8jl2blSS2tFr8d/MXi4xjmj8XPAJzU2AaHL8u7iPjeZlFiKM xINtZiLihMB1RQsDpoCAAA= X-Env-Sender: sstabellini@kernel.org X-Msg-Ref: server-12.tower-27.messagelabs.com!1489449375!90098491!1 X-Originating-IP: [198.145.29.136] X-SpamReason: No, hits=0.0 required=7.0 tests= X-StarScan-Received: X-StarScan-Version: 9.2.3; banners=-,-,- X-VirusChecked: Checked Received: (qmail 12728 invoked from network); 13 Mar 2017 23:56:16 -0000 Received: from mail.kernel.org (HELO mail.kernel.org) (198.145.29.136) by server-12.tower-27.messagelabs.com with DHE-RSA-AES256-GCM-SHA384 encrypted SMTP; 13 Mar 2017 23:56:16 -0000 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9499920411; Mon, 13 Mar 2017 23:56:12 +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 592AF20416; Mon, 13 Mar 2017 23:56:11 +0000 (UTC) From: Stefano Stabellini To: qemu-devel@nongnu.org Date: Mon, 13 Mar 2017 16:55:57 -0700 Message-Id: <1489449360-14411-6-git-send-email-sstabellini@kernel.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1489449360-14411-1-git-send-email-sstabellini@kernel.org> References: <1489449360-14411-1-git-send-email-sstabellini@kernel.org> X-Virus-Scanned: ClamAV using ClamSMTP Cc: jgross@suse.com, sstabellini@kernel.org, groug@kaod.org, Stefano Stabellini , "Aneesh Kumar K.V" , anthony.perard@citrix.com, xen-devel@lists.xenproject.org Subject: [Xen-devel] [PATCH v2 6/9] xen/9pfs: receive requests from the frontend X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP 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 | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c index 0e4a133..741dd31 100644 --- a/hw/9pfs/xen-9p-backend.c +++ b/hw/9pfs/xen-9p-backend.c @@ -94,12 +94,59 @@ static int xen_9pfs_init(struct XenDevice *xendev) return 0; } +static int xen_9pfs_receive(struct Xen9pfsRing *ring) +{ + struct xen_9pfs_header 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_9PFS_RING_SIZE) < sizeof(h)) { + return 0; + } + ring->inprogress = true; + + masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE); + masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE); + + xen_9pfs_read_packet(ring->ring.out, masked_prod, &masked_cons, + XEN_9PFS_RING_SIZE, (uint8_t*) &h, sizeof(h)); + + pdu = pdu_alloc(&ring->priv->state); + pdu->size = h.size; + pdu->id = h.id; + pdu->tag = h.tag; + ring->out_size = h.size; + ring->out_cons = cons + h.size; + + qemu_co_queue_init(&pdu->complete); + pdu_submit(pdu); + + return 0; +} + static void xen_9pfs_bh(void *opaque) { + struct Xen9pfsRing *ring = opaque; + xen_9pfs_receive(ring); } static void xen_9pfs_evtchn_event(void *opaque) { + struct 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)