From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22D98C74A5B for ; Tue, 21 Mar 2023 09:08:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229739AbjCUJIi (ORCPT ); Tue, 21 Mar 2023 05:08:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34768 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229864AbjCUJId (ORCPT ); Tue, 21 Mar 2023 05:08:33 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AD8875B92 for ; Tue, 21 Mar 2023 02:07:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1679389665; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=TxTS5ViTydaXh/skwlc4PDyBHB5ONwiCHoXqm/uMAZ8=; b=L63qafRtTsA1G5aOQz5N0i33JMGg39yfz7CPDaWsvD7LRIH055tMC2m/musQL344oAKB9C dAiLXCyLSDzUfGx0P9gm0cWXtMCW0gJuo1XZAryu1pjFYKUhXL52bAQUbFOnPHjCP7sM9U FFJ/QyMHVdEf62ngVr89VWixBrDdc+4= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-612-qmcjK3DJPQ6BEyxLxwrsAQ-1; Tue, 21 Mar 2023 05:07:44 -0400 X-MC-Unique: qmcjK3DJPQ6BEyxLxwrsAQ-1 Received: by mail-wm1-f72.google.com with SMTP id bi5-20020a05600c3d8500b003edda1368d7so2387970wmb.8 for ; Tue, 21 Mar 2023 02:07:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679389663; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=TxTS5ViTydaXh/skwlc4PDyBHB5ONwiCHoXqm/uMAZ8=; b=KfqSHVuDXBhc7IkloKxGvExaokwxdqjLDPBBI1qfZxD0RmSolGrXwbiaol80yE7tkj NWAYO2oLrXSS2N6KvtmvJvAeCGpaKIxjUtNmPBC3dKYiQkS99WK3WsdzHe6ygOpV+qdW 77uWfzKuIrv6gR3ifXuDnxH1dhVPeLQyF5wmJwqOOIzXBrLSyPTzCBhaK+JWsUz/CSyJ x5duFKA7bVbAJDUoadf7TM/ZZlGbFl6KWu0G3SMyYeB4hBVhhShM+SMtdTd9zbfbWWs8 KyrGP0O0QZlivq3s9Yg/EPElMH8QRoapQN5L1Lz4UA3J5RYkLy5qJo8bCnEuUOLtpf6a EddQ== X-Gm-Message-State: AO0yUKU6hnbyy9iERFSUafsGrrGY6imaD4+33AhPxGvZVFJirghFbaqx NkcOtUjSa1H9KdJM/pGByD/ztooEnt3Szru5HTb+pM9nMPUNslm8guiAqOtUuaukhfDQWjciKTI 2XFC4HNqiA8NZhvBG2XIL30GG X-Received: by 2002:adf:e7d1:0:b0:2d2:d324:e44f with SMTP id e17-20020adfe7d1000000b002d2d324e44fmr1833310wrn.16.1679389663371; Tue, 21 Mar 2023 02:07:43 -0700 (PDT) X-Google-Smtp-Source: AK7set8rdGk1Xi3XCG51r7iI8dIWqGm7FxVlS/Io6weMMs7WpN4AKGfDdGE3SAbdAZa+LqTF4JoysA== X-Received: by 2002:adf:e7d1:0:b0:2d2:d324:e44f with SMTP id e17-20020adfe7d1000000b002d2d324e44fmr1833288wrn.16.1679389663088; Tue, 21 Mar 2023 02:07:43 -0700 (PDT) Received: from redhat.com ([2.52.1.105]) by smtp.gmail.com with ESMTPSA id a18-20020a5d4d52000000b002d1e49cff35sm10811622wru.40.2023.03.21.02.07.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Mar 2023 02:07:42 -0700 (PDT) Date: Tue, 21 Mar 2023 05:07:39 -0400 From: "Michael S. Tsirkin" To: Viktor Prutyanov Cc: Jason Wang , cohuck@redhat.com, pasic@linux.ibm.com, farman@linux.ibm.com, linux-s390@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, yan@daynix.com Subject: Re: [PATCH v2] virtio: add VIRTIO_F_NOTIFICATION_DATA feature support Message-ID: <20230321050719-mutt-send-email-mst@kernel.org> References: <20230320232115.1940587-1-viktor@daynix.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Mar 21, 2023 at 12:00:42PM +0300, Viktor Prutyanov wrote: > On Tue, Mar 21, 2023 at 5:29 AM Jason Wang wrote: > > > > On Tue, Mar 21, 2023 at 7:21 AM Viktor Prutyanov wrote: > > > > > > According to VirtIO spec v1.2, VIRTIO_F_NOTIFICATION_DATA feature > > > indicates that the driver passes extra data along with the queue > > > notifications. > > > > > > In a split queue case, the extra data is 16-bit available index. In a > > > packed queue case, the extra data is 1-bit wrap counter and 15-bit > > > available index. > > > > > > Add support for this feature for MMIO and PCI transports. Channel I/O > > > transport will not accept this feature. > > > > > > Signed-off-by: Viktor Prutyanov > > > --- > > > > > > v2: reject the feature in virtio_ccw, replace __le32 with u32 > > > > > > drivers/s390/virtio/virtio_ccw.c | 4 +--- > > > drivers/virtio/virtio_mmio.c | 15 ++++++++++++++- > > > drivers/virtio/virtio_pci_common.c | 10 ++++++++++ > > > drivers/virtio/virtio_pci_common.h | 4 ++++ > > > drivers/virtio/virtio_pci_legacy.c | 2 +- > > > drivers/virtio/virtio_pci_modern.c | 2 +- > > > drivers/virtio/virtio_ring.c | 17 +++++++++++++++++ > > > include/linux/virtio_ring.h | 2 ++ > > > include/uapi/linux/virtio_config.h | 6 ++++++ > > > 9 files changed, 56 insertions(+), 6 deletions(-) > > > > > > diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c > > > index a10dbe632ef9..d72a59415527 100644 > > > --- a/drivers/s390/virtio/virtio_ccw.c > > > +++ b/drivers/s390/virtio/virtio_ccw.c > > > @@ -789,9 +789,7 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev) > > > > > > static void ccw_transport_features(struct virtio_device *vdev) > > > { > > > - /* > > > - * Currently nothing to do here. > > > - */ > > > + __virtio_clear_bit(vdev, VIRTIO_F_NOTIFICATION_DATA); > > > > Is there any restriction that prevents us from implementing > > VIRTIO_F_NOTIFICATION_DATA? (Spec seems doesn't limit us from this) > > Most likely, nothing. So pls code it up. It's the same format. > > > > > } > > > > > > static int virtio_ccw_finalize_features(struct virtio_device *vdev) > > > diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c > > > index 3ff746e3f24a..0e13da17fe0a 100644 > > > --- a/drivers/virtio/virtio_mmio.c > > > +++ b/drivers/virtio/virtio_mmio.c > > > @@ -285,6 +285,19 @@ static bool vm_notify(struct virtqueue *vq) > > > return true; > > > } > > > > > > +static bool vm_notify_with_data(struct virtqueue *vq) > > > +{ > > > + struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); > > > + u32 data = vring_fill_notification_data(vq); > > > > Can we move this to the initialization? > > This data is new for each notification, because it helps to identify > the next available index. > > > > > Thanks > > > > Thanks, > Viktor Prutyanov