From patchwork Fri Feb 23 08:27:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13568672 Received: from out30-99.freemail.mail.aliyun.com (out30-99.freemail.mail.aliyun.com [115.124.30.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1306918E10; Fri, 23 Feb 2024 08:27:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.99 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708676875; cv=none; b=RRsi5rr6HSg4x1OlOqEG3XUXn3JN4QDOaGZAacHlkQ8d+gIeQmh89BDGnTcTqMzzS6yy9Xws96p/N7IDusmpjBBC6H5ajO0oVO5pH03UWbwICIJhcX1U3PxTf0NDNnjYP+A5ilRu1dONOkX2fN3DvOzy9+xym87Kn7bHz0hnPjE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708676875; c=relaxed/simple; bh=MUO8U5SVj3P1Xil/ahjJ/yQETxekSikLccDlysDuyiA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Iu7nBnbb2vgF88Is8TEQHnPB0Jl72/qZ0NlLHfLdg8KkIaRvu7RwxMfSbO+mLiE8GKOsK9VJ1TujR9TFGvgTcf529uD946m8pjVNRUleHh/oCJIbVl06zF1XSPoodHJgh4dh5ts/MfkY6Eomc5mMwU0fdxGBE1dsMhQKlK5dPGg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=t1LNZosJ; arc=none smtp.client-ip=115.124.30.99 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="t1LNZosJ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1708676869; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=IRSlxqMw0yhAkJ08APM/0uZy3bVrhWlhvpCjnaXaq8Y=; b=t1LNZosJHBLCIZeeUifChXubUsuLD+pu41mOziZXz+utapTHViHq5oxiMLcvlXUf4KOi9nw19/LrGpOTzO1DsLt2Ek0gFAyyKYJIPo++g+cVt6MY6e55YWFSlkUwrgobaxDrpy1mwOuaSNv9m6Dn9GHhn/1QacMGKcglrSMQbVU= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R141e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045192;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=35;SR=0;TI=SMTPD_---0W13ndOb_1708676867; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W13ndOb_1708676867) by smtp.aliyun-inc.com; Fri, 23 Feb 2024 16:27:47 +0800 From: Xuan Zhuo To: virtualization@lists.linux.dev Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Vadim Pasternak , Bjorn Andersson , Mathieu Poirier , Cornelia Huck , Halil Pasic , Eric Farman , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , linux-um@lists.infradead.org, netdev@vger.kernel.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 vhost v2 13/19] virtio_net: set premapped mode by find_vqs() Date: Fri, 23 Feb 2024 16:27:20 +0800 Message-Id: <20240223082726.52915-14-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240223082726.52915-1-xuanzhuo@linux.alibaba.com> References: <20240223082726.52915-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: 510995f33855 Now, the virtio core can set the premapped mode by find_vqs(). If the premapped can be enabled, the dma array will not be allocated. So virtio-net use the api of find_vqs to enable the premapped. Judge the premapped mode by the vq->premapped instead of saving local variable. Signed-off-by: Xuan Zhuo --- drivers/net/virtio_net.c | 57 +++++++++++++++++------------------ include/linux/virtio_config.h | 16 ++-------- 2 files changed, 29 insertions(+), 44 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index d7ce4a1011ea..140b2c155650 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -208,9 +208,6 @@ struct receive_queue { /* Record the last dma info to free after new pages is allocated. */ struct virtnet_rq_dma *last_dma; - - /* Do dma by self */ - bool do_dma; }; /* This structure can contain rss message with maximum settings for indirection table and keysize @@ -657,7 +654,7 @@ static void *virtnet_rq_get_buf(struct receive_queue *rq, u32 *len, void **ctx) void *buf; buf = virtqueue_get_buf_ctx(rq->vq, len, ctx); - if (buf && rq->do_dma) + if (buf && rq->vq->premapped) virtnet_rq_unmap(rq, buf, *len); return buf; @@ -670,7 +667,7 @@ static void virtnet_rq_init_one_sg(struct receive_queue *rq, void *buf, u32 len) u32 offset; void *head; - if (!rq->do_dma) { + if (!rq->vq->premapped) { sg_init_one(rq->sg, buf, len); return; } @@ -700,7 +697,7 @@ static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp) head = page_address(alloc_frag->page); - if (rq->do_dma) { + if (rq->vq->premapped) { dma = head; /* new pages */ @@ -746,22 +743,6 @@ static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp) return buf; } -static void virtnet_rq_set_premapped(struct virtnet_info *vi) -{ - int i; - - /* disable for big mode */ - if (!vi->mergeable_rx_bufs && vi->big_packets) - return; - - for (i = 0; i < vi->max_queue_pairs; i++) { - if (virtqueue_set_dma_premapped(vi->rq[i].vq)) - continue; - - vi->rq[i].do_dma = true; - } -} - static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf) { struct virtnet_info *vi = vq->vdev->priv; @@ -770,7 +751,7 @@ static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf) rq = &vi->rq[i]; - if (rq->do_dma) + if (rq->vq->premapped) virtnet_rq_unmap(rq, buf, 0); virtnet_rq_free_buf(vi, rq, buf); @@ -1865,7 +1846,7 @@ static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); if (err < 0) { - if (rq->do_dma) + if (rq->vq->premapped) virtnet_rq_unmap(rq, buf, 0); put_page(virt_to_head_page(buf)); } @@ -1980,7 +1961,7 @@ static int add_recvbuf_mergeable(struct virtnet_info *vi, ctx = mergeable_len_to_ctx(len + room, headroom); err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); if (err < 0) { - if (rq->do_dma) + if (rq->vq->premapped) virtnet_rq_unmap(rq, buf, 0); put_page(virt_to_head_page(buf)); } @@ -4229,7 +4210,7 @@ static void free_receive_page_frags(struct virtnet_info *vi) int i; for (i = 0; i < vi->max_queue_pairs; i++) if (vi->rq[i].alloc_frag.page) { - if (vi->rq[i].do_dma && vi->rq[i].last_dma) + if (vi->rq[i].vq->premapped && vi->rq[i].last_dma) virtnet_rq_unmap(&vi->rq[i], vi->rq[i].last_dma, 0); put_page(vi->rq[i].alloc_frag.page); } @@ -4293,11 +4274,13 @@ static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqu static int virtnet_find_vqs(struct virtnet_info *vi) { + struct virtio_vq_config cfg = {}; vq_callback_t **callbacks; struct virtqueue **vqs; const char **names; int ret = -ENOMEM; int total_vqs; + bool *premapped; bool *ctx; u16 i; @@ -4322,8 +4305,13 @@ static int virtnet_find_vqs(struct virtnet_info *vi) ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); if (!ctx) goto err_ctx; + + premapped = kcalloc(total_vqs, sizeof(*premapped), GFP_KERNEL); + if (!ctx) + goto err_premapped; } else { ctx = NULL; + premapped = NULL; } /* Parameters for control virtqueue, if any */ @@ -4342,10 +4330,19 @@ static int virtnet_find_vqs(struct virtnet_info *vi) names[txq2vq(i)] = vi->sq[i].name; if (ctx) ctx[rxq2vq(i)] = true; + + if (premapped) + premapped[rxq2vq(i)] = true; } - ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks, - names, ctx, NULL); + cfg.nvqs = total_vqs; + cfg.vqs = vqs; + cfg.callbacks = callbacks; + cfg.names = names; + cfg.ctx = ctx; + cfg.premapped = premapped; + + ret = virtio_find_vqs_cfg(vi->vdev, &cfg); if (ret) goto err_find; @@ -4365,6 +4362,8 @@ static int virtnet_find_vqs(struct virtnet_info *vi) err_find: + kfree(premapped); +err_premapped: kfree(ctx); err_ctx: kfree(names); @@ -4437,8 +4436,6 @@ static int init_vqs(struct virtnet_info *vi) if (ret) goto err_free; - virtnet_rq_set_premapped(vi); - cpus_read_lock(); virtnet_set_affinity(vi); cpus_read_unlock(); diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index f1f62e57f395..e40509fef5fe 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -260,21 +260,9 @@ int virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs, } static inline -int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs, - struct virtqueue *vqs[], vq_callback_t *callbacks[], - const char * const names[], const bool *ctx, - struct irq_affinity *desc) +int virtio_find_vqs_cfg(struct virtio_device *vdev, struct virtio_vq_config *cfg) { - struct virtio_vq_config cfg = {}; - - cfg.nvqs = nvqs; - cfg.vqs = vqs; - cfg.callbacks = callbacks; - cfg.names = (const char **)names; - cfg.ctx = ctx; - cfg.desc = desc; - - return vdev->config->find_vqs(vdev, &cfg); + return vdev->config->find_vqs(vdev, cfg); } /**