From patchwork Mon Mar 13 23:55:59 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Stabellini X-Patchwork-Id: 9622353 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 ECA6B604CC for ; Tue, 14 Mar 2017 00:02:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DE2CE2851A for ; Tue, 14 Mar 2017 00:02:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D226A28520; Tue, 14 Mar 2017 00:02:38 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 598762851A for ; Tue, 14 Mar 2017 00:02:38 +0000 (UTC) Received: from localhost ([::1]:55703 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cnZvB-0005qX-Hd for patchwork-qemu-devel@patchwork.kernel.org; Mon, 13 Mar 2017 20:02:37 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54129) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cnZp4-0000P1-S6 for qemu-devel@nongnu.org; Mon, 13 Mar 2017 19:56:19 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cnZp4-0004pv-1t for qemu-devel@nongnu.org; Mon, 13 Mar 2017 19:56:18 -0400 Received: from mail.kernel.org ([198.145.29.136]:46884) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cnZp3-0004pT-S3 for qemu-devel@nongnu.org; Mon, 13 Mar 2017 19:56:17 -0400 Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D605020416; Mon, 13 Mar 2017 23:56:15 +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 A40B32041C; Mon, 13 Mar 2017 23:56:14 +0000 (UTC) From: Stefano Stabellini To: qemu-devel@nongnu.org Date: Mon, 13 Mar 2017 16:55:59 -0700 Message-Id: <1489449360-14411-8-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 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 198.145.29.136 Subject: [Qemu-devel] [PATCH v2 8/9] xen/9pfs: send responses back to 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, xen-devel@lists.xenproject.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Once a request is completed, xen_9pfs_push_and_notify gets called. In xen_9pfs_push_and_notify, update the indexes (data has already been copied to the sg by the common code) and send a notification to the frontend. Schedule the bottom-half to check if we already have any other requests pending. 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 | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c index d72a749..fed369f 100644 --- a/hw/9pfs/xen-9p-backend.c +++ b/hw/9pfs/xen-9p-backend.c @@ -166,6 +166,22 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu, static void xen_9pfs_push_and_notify(V9fsPDU *pdu) { + RING_IDX prod; + struct Xen9pfsDev *priv = container_of(pdu->s, struct Xen9pfsDev, state); + struct Xen9pfsRing *ring = &priv->rings[pdu->tag % priv->num_rings]; + + ring->intf->out_cons = ring->out_cons; + xen_wmb(); + + prod = ring->intf->in_prod; + xen_rmb(); + ring->intf->in_prod = prod + pdu->size; + xen_wmb(); + + ring->inprogress = false; + xenevtchn_notify(ring->evtchndev, ring->local_port); + + qemu_bh_schedule(ring->bh); } static const struct V9fsTransport xen_9p_transport = {