From patchwork Mon Oct 14 03:12:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13834122 X-Patchwork-Delegate: kuba@kernel.org Received: from out30-132.freemail.mail.aliyun.com (out30-132.freemail.mail.aliyun.com [115.124.30.132]) (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 1FC425D8F0 for ; Mon, 14 Oct 2024 03:12:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.132 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728875569; cv=none; b=Wf4HTfIKZSyXbnw3x1cL7+J/Jc06+XQJKKEBaOjh1kJJLg2GqqBNpmdaz1dH8d3nmYMUPGujVQILcX+AGAQa8sjlaj7qjc3JO8jZqwXSpVMSh4lH6nDyHh8xclZUpO0kIbave+sefao/yMfxt3zYXZdhxd2IIZAV8byHVRzse+o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728875569; c=relaxed/simple; bh=oIhm1daivK/11ogqXkp0GvPygiIMR2q6YNLg9ZQ4x8w=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=HXQdRl4vv+pOK3neapHfZOHbYRZLjqzmhFAQEMZrdAqqF2b3I4nY08WTHRNjW1Bqf48y/RzkykZYhcUQsa6Rht/cDKiSJGRJQ3qpy8640tEUKPZUZCXI8T3XtZv+MWi/BsVEKuRtCCL8q0ov+4UTOJ+TdiRtoHqO25o+Y20jJgY= 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=pN8t188d; arc=none smtp.client-ip=115.124.30.132 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="pN8t188d" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1728875560; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=ME97rGVXnM1xi7LnckE//Kdi+K7d+GvCGFmbbyMwvVk=; b=pN8t188doxzlU4FZRE30vQQ4wH9VTDJPz+4aVV/9rb6EtcS6TcBZWFw7I/kZoB60plpDe5MdIeEZkZ/XG8Js1A1M69ldy7Fr0NExQFp/U/f+27bzgkT//1TorwgyUD0C0yMHRCJZei1H0r9Oy75M02vDapPuYrSwijVGENNpJlo= Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0WH.LEWK_1728875558 cluster:ay36) by smtp.aliyun-inc.com; Mon, 14 Oct 2024 11:12:39 +0800 From: Xuan Zhuo To: netdev@vger.kernel.org Cc: "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , virtualization@lists.linux.dev Subject: [PATCH 5/5] virtio_net: rx remove premapped failover code Date: Mon, 14 Oct 2024 11:12:34 +0800 Message-Id: <20241014031234.7659-6-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20241014031234.7659-1-xuanzhuo@linux.alibaba.com> References: <20241014031234.7659-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: bba499faae26 X-Patchwork-Delegate: kuba@kernel.org Now, the premapped mode can be enabled unconditionally. So we can remove the failover code for merge and small mode. Signed-off-by: Xuan Zhuo --- drivers/net/virtio_net.c | 80 +++++++++++++++++----------------------- 1 file changed, 33 insertions(+), 47 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 8cf24b7b58bd..4d3e35b02478 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -356,9 +356,6 @@ struct receive_queue { struct xdp_rxq_info xsk_rxq_info; struct xdp_buff **xsk_buffs; - - /* Do dma by self */ - bool do_dma; }; /* This structure can contain rss message with maximum settings for indirection table and keysize @@ -899,7 +896,7 @@ 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) virtnet_rq_unmap(rq, buf, *len); return buf; @@ -912,11 +909,6 @@ static void virtnet_rq_init_one_sg(struct receive_queue *rq, void *buf, u32 len) u32 offset; void *head; - if (!rq->do_dma) { - sg_init_one(rq->sg, buf, len); - return; - } - head = page_address(rq->alloc_frag.page); offset = buf - head; @@ -939,44 +931,42 @@ static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp) head = page_address(alloc_frag->page); - if (rq->do_dma) { - dma = head; - - /* new pages */ - if (!alloc_frag->offset) { - if (rq->last_dma) { - /* Now, the new page is allocated, the last dma - * will not be used. So the dma can be unmapped - * if the ref is 0. - */ - virtnet_rq_unmap(rq, rq->last_dma, 0); - rq->last_dma = NULL; - } + dma = head; - dma->len = alloc_frag->size - sizeof(*dma); + /* new pages */ + if (!alloc_frag->offset) { + if (rq->last_dma) { + /* Now, the new page is allocated, the last dma + * will not be used. So the dma can be unmapped + * if the ref is 0. + */ + virtnet_rq_unmap(rq, rq->last_dma, 0); + rq->last_dma = NULL; + } - addr = virtqueue_dma_map_single_attrs(rq->vq, dma + 1, - dma->len, DMA_FROM_DEVICE, 0); - if (virtqueue_dma_mapping_error(rq->vq, addr)) - return NULL; + dma->len = alloc_frag->size - sizeof(*dma); - dma->addr = addr; - dma->need_sync = virtqueue_dma_need_sync(rq->vq, addr); + addr = virtqueue_dma_map_single_attrs(rq->vq, dma + 1, + dma->len, DMA_FROM_DEVICE, 0); + if (virtqueue_dma_mapping_error(rq->vq, addr)) + return NULL; - /* Add a reference to dma to prevent the entire dma from - * being released during error handling. This reference - * will be freed after the pages are no longer used. - */ - get_page(alloc_frag->page); - dma->ref = 1; - alloc_frag->offset = sizeof(*dma); + dma->addr = addr; + dma->need_sync = virtqueue_dma_need_sync(rq->vq, addr); - rq->last_dma = dma; - } + /* Add a reference to dma to prevent the entire dma from + * being released during error handling. This reference + * will be freed after the pages are no longer used. + */ + get_page(alloc_frag->page); + dma->ref = 1; + alloc_frag->offset = sizeof(*dma); - ++dma->ref; + rq->last_dma = dma; } + ++dma->ref; + buf = head + alloc_frag->offset; get_page(alloc_frag->page); @@ -2452,8 +2442,7 @@ 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) - virtnet_rq_unmap(rq, buf, 0); + virtnet_rq_unmap(rq, buf, 0); put_page(virt_to_head_page(buf)); } @@ -2573,8 +2562,7 @@ 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) - virtnet_rq_unmap(rq, buf, 0); + virtnet_rq_unmap(rq, buf, 0); put_page(virt_to_head_page(buf)); } @@ -5948,7 +5936,7 @@ 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].last_dma) virtnet_rq_unmap(&vi->rq[i], vi->rq[i].last_dma, 0); put_page(vi->rq[i].alloc_frag.page); } @@ -6141,11 +6129,9 @@ static void virtnet_rq_set_premapped(struct virtnet_info *vi) if (vi->mode == VIRTNET_MODE_BIG) return; - for (i = 0; i < vi->max_queue_pairs; i++) { + for (i = 0; i < vi->max_queue_pairs; i++) /* error should never happen */ BUG_ON(virtqueue_set_dma_premapped(vi->rq[i].vq)); - vi->rq[i].do_dma = true; - } } static int init_vqs(struct virtnet_info *vi)