From patchwork Thu Feb 24 08:10:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 1597017 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=Io/MPkB7; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.infradead.org (client-ip=2607:7c80:54:e::133; helo=bombadil.infradead.org; envelope-from=linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=) Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4K45GQ0BtBz9sGL for ; Thu, 24 Feb 2022 19:11:41 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=1VWq6nX8C12Wf+pxE+4T8e9tnNHNGcyR1PGy7vN848E=; b=Io/MPkB7ABx2mj Hj7fv6hLwYNfMH9JHVRuDANTod32MnjwEgq0AxtjLljZZEqMOxQUOaXjF1KlCFnJlgsoJKTt/4M1c wsNRwmh4WDl3G8CstH5d7UZHwRj8sVXV/qdvUoKrXdwq28b5d/jqrliD4bBbh+k2lJcJasO+gAc9h vbyimRw30l7Mrl0xzdSlIdr6CP2tiqRkanX92KXoqzCWCYbBVa5SUWsgAPzx3nHDs9r13VZICwMpb msE+zCqymWGbEorRCQs5+BXnBNLvN2tT+Eyu1e10YG9Qxe3E0k6Xe4TaZuyxCtKog/1p3vUKOwmO8 +OtuNGQPlqsnPCoCxKHw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nN9Dm-00HEXd-Ji; Thu, 24 Feb 2022 08:11:30 +0000 Received: from out30-54.freemail.mail.aliyun.com ([115.124.30.54]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nN9Df-00HEQb-EA for linux-um@lists.infradead.org; Thu, 24 Feb 2022 08:11:29 +0000 X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R131e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04400; MF=xuanzhuo@linux.alibaba.com; NM=1; PH=DS; RN=34; SR=0; TI=SMTPD_---0V5N6CR0_1645690273; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0V5N6CR0_1645690273) by smtp.aliyun-inc.com(127.0.0.1); Thu, 24 Feb 2022 16:11:14 +0800 From: Xuan Zhuo To: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: Jeff Dike , Richard Weinberger , Anton Ivanov , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Hans de Goede , Mark Gross , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Alexander Gordeev , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Johannes Berg , Vincent Whitchurch , Xuan Zhuo , linux-um@lists.infradead.org, platform-driver-x86@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH v6 05/26] virtio_ring: split: extract the logic of init vq and attach vring Date: Thu, 24 Feb 2022 16:10:41 +0800 Message-Id: <20220224081102.80224-6-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220224081102.80224-1-xuanzhuo@linux.alibaba.com> References: <20220224081102.80224-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: bd1c915e263f X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220224_001123_726718_392FFAE1 X-CRM114-Status: GOOD ( 12.94 ) X-Spam-Score: -8.0 (--------) X-Spam-Report: Spam detection software, running on the system "bombadil.infradead.org", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Split the logic of split assignment vq into three parts. 1. The assignment passed from the function parameter 2. The part that attaches vring to vq. -- __vring_virtqueue_attach_split() 3. The part that initializes vq to a fixed value -- __vring_virtqueue_in [...] Content analysis details: (-8.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [115.124.30.54 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -7.5 USER_IN_DEF_SPF_WL From: address is in the default SPF white-list -0.5 ENV_AND_HDR_SPF_MATCH Env and Hdr From used in default SPF WL Match 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org Split the logic of split assignment vq into three parts. 1. The assignment passed from the function parameter 2. The part that attaches vring to vq. -- __vring_virtqueue_attach_split() 3. The part that initializes vq to a fixed value -- __vring_virtqueue_init_split() This feature is required for subsequent virtuqueue reset vring Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 111 +++++++++++++++++++++-------------- 1 file changed, 67 insertions(+), 44 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index d32793615451..dc6313b79305 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -2196,34 +2196,40 @@ irqreturn_t vring_interrupt(int irq, void *_vq) } EXPORT_SYMBOL_GPL(vring_interrupt); -/* Only available for split ring */ -struct virtqueue *__vring_new_virtqueue(unsigned int index, - struct vring vring, - struct virtio_device *vdev, - bool weak_barriers, - bool context, - bool (*notify)(struct virtqueue *), - void (*callback)(struct virtqueue *), - const char *name) +static int __vring_virtqueue_attach_split(struct vring_virtqueue *vq, + struct virtio_device *vdev, + struct vring vring) { - struct vring_virtqueue *vq; + vq->vq.num_free = vring.num; - if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)) - return NULL; + vq->split.vring = vring; + vq->split.queue_dma_addr = 0; + vq->split.queue_size_in_bytes = 0; - vq = kmalloc(sizeof(*vq), GFP_KERNEL); - if (!vq) - return NULL; + vq->split.desc_state = kmalloc_array(vring.num, + sizeof(struct vring_desc_state_split), GFP_KERNEL); + if (!vq->split.desc_state) + goto err_state; + vq->split.desc_extra = vring_alloc_desc_extra(vq, vring.num); + if (!vq->split.desc_extra) + goto err_extra; + + memset(vq->split.desc_state, 0, vring.num * + sizeof(struct vring_desc_state_split)); + return 0; + +err_extra: + kfree(vq->split.desc_state); +err_state: + return -ENOMEM; +} + +static void __vring_virtqueue_init_split(struct vring_virtqueue *vq, + struct virtio_device *vdev) +{ vq->packed_ring = false; - vq->vq.callback = callback; - vq->vq.vdev = vdev; - vq->vq.name = name; - vq->vq.num_free = vring.num; - vq->vq.index = index; vq->we_own_ring = false; - vq->notify = notify; - vq->weak_barriers = weak_barriers; vq->broken = false; vq->last_used_idx = 0; vq->event_triggered = false; @@ -2234,50 +2240,67 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index, vq->last_add_time_valid = false; #endif - vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && - !context; vq->event = virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX); if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM)) vq->weak_barriers = false; - vq->split.queue_dma_addr = 0; - vq->split.queue_size_in_bytes = 0; - - vq->split.vring = vring; vq->split.avail_flags_shadow = 0; vq->split.avail_idx_shadow = 0; /* No callback? Tell other side not to bother us. */ - if (!callback) { + if (!vq->vq.callback) { vq->split.avail_flags_shadow |= VRING_AVAIL_F_NO_INTERRUPT; if (!vq->event) vq->split.vring.avail->flags = cpu_to_virtio16(vdev, vq->split.avail_flags_shadow); } - vq->split.desc_state = kmalloc_array(vring.num, - sizeof(struct vring_desc_state_split), GFP_KERNEL); - if (!vq->split.desc_state) - goto err_state; - - vq->split.desc_extra = vring_alloc_desc_extra(vq, vring.num); - if (!vq->split.desc_extra) - goto err_extra; - /* Put everything in free lists. */ vq->free_head = 0; - memset(vq->split.desc_state, 0, vring.num * - sizeof(struct vring_desc_state_split)); +} + +/* Only available for split ring */ +struct virtqueue *__vring_new_virtqueue(unsigned int index, + struct vring vring, + struct virtio_device *vdev, + bool weak_barriers, + bool context, + bool (*notify)(struct virtqueue *), + void (*callback)(struct virtqueue *), + const char *name) +{ + struct vring_virtqueue *vq; + int err; + + if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)) + return NULL; + + vq = kmalloc(sizeof(*vq), GFP_KERNEL); + if (!vq) + return NULL; + + vq->vq.callback = callback; + vq->vq.vdev = vdev; + vq->vq.name = name; + vq->vq.index = index; + vq->notify = notify; + vq->weak_barriers = weak_barriers; + vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) && + !context; + + err = __vring_virtqueue_attach_split(vq, vdev, vring); + if (err) + goto err; + + __vring_virtqueue_init_split(vq, vdev); spin_lock(&vdev->vqs_list_lock); list_add_tail(&vq->vq.list, &vdev->vqs); spin_unlock(&vdev->vqs_list_lock); - return &vq->vq; -err_extra: - kfree(vq->split.desc_state); -err_state: + return &vq->vq; +err: kfree(vq); return NULL; }