From patchwork Fri Sep 6 12:31:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13794107 X-Patchwork-Delegate: kuba@kernel.org Received: from out30-98.freemail.mail.aliyun.com (out30-98.freemail.mail.aliyun.com [115.124.30.98]) (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 2E59F1CC8B7 for ; Fri, 6 Sep 2024 12:31:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.98 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725625910; cv=none; b=HCXVRQGyW4HpRVRnJO53e7bdDnFw7+HdduHTPW+RveRmzyT2EYGnV4IXNsHFSS3LHKiDKM+yJJwqV53q2s89oy+SCNggCeHBZEIc6AK6h32M9adPBsi/ADUFeKuELDzNnEaX36N65ONeS0BiO/CbJkFy3I9LPQaGetnZ0Gp6hyE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725625910; c=relaxed/simple; bh=cvsi0uFkpQ+U556Mwb5danntP4uMXdWjwFaw/Q68ohw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=uktKNiFCDXKGunxYx58OIPcC3CdHemmxc68+nICS8H16LrOwMNYXnGS67TLgNHyhGp5JlL4eaoo4K4EkM+ER6U3sy52Laes9M6RUGFl0M02yCd/y2rG7+qpcBReJnkuLLAS/KvUOiE0+Xn53oOtloFuK2oVfKYOJfbw8yoyA954= 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=MyFIM6Pw; arc=none smtp.client-ip=115.124.30.98 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="MyFIM6Pw" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1725625900; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=7bAxaP5PLluKM5b7edB1EQQ3ZESyVVe4USeV4Iqfw/g=; b=MyFIM6PwPmIXdOTJCT6VtKkb4CMSjEY/P9UYnXuuVaLlqVJY42O4ZP5uNFTBkdoYR2rNqoP9R4QYEuD41hpIQLfdxD2JsxVJeAbYj3P4M3DgmDhplN66cPrvbne8VBLvGqIVOn/x2YX/Cquqr7fci9ixUGHQOILOH1SQZg2o1xE= Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0WEPZH3I_1725625898) by smtp.aliyun-inc.com; Fri, 06 Sep 2024 20:31:39 +0800 From: Xuan Zhuo To: virtualization@lists.linux.dev Cc: "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, Darren Kenny , "Si-Wei Liu" Subject: [PATCH 1/3] Revert "virtio_net: rx remove premapped failover code" Date: Fri, 6 Sep 2024 20:31:35 +0800 Message-Id: <20240906123137.108741-2-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240906123137.108741-1-xuanzhuo@linux.alibaba.com> References: <20240906123137.108741-1-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: ccfd5e625b8b X-Patchwork-Delegate: kuba@kernel.org This reverts commit defd28aa5acb0fd7c15adc6bc40a8ac277d04dea. Recover the code to disable premapped mode. Signed-off-by: Xuan Zhuo --- drivers/net/virtio_net.c | 85 +++++++++++++++++++++++----------------- 1 file changed, 50 insertions(+), 35 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index f1f83d8ddbd4..36a7781979b7 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -356,6 +356,9 @@ 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 @@ -887,7 +890,7 @@ 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) + if (buf && rq->do_dma) virtnet_rq_unmap(rq, buf, *len); return buf; @@ -900,6 +903,11 @@ 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; @@ -925,42 +933,44 @@ static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp) head = page_address(alloc_frag->page); - dma = head; + 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; + } - /* 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->len = alloc_frag->size - sizeof(*dma); - dma->len = alloc_frag->size - sizeof(*dma); + 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; - 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->addr = addr; + dma->need_sync = virtqueue_dma_need_sync(rq->vq, addr); - dma->addr = addr; - dma->need_sync = virtqueue_dma_need_sync(rq->vq, addr); + /* 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); - /* 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); + rq->last_dma = dma; + } - rq->last_dma = dma; + ++dma->ref; } - ++dma->ref; - buf = head + alloc_frag->offset; get_page(alloc_frag->page); @@ -977,9 +987,12 @@ static void virtnet_rq_set_premapped(struct virtnet_info *vi) if (!vi->mergeable_rx_bufs && vi->big_packets) return; - for (i = 0; i < vi->max_queue_pairs; i++) - /* error should never happen */ - BUG_ON(virtqueue_set_dma_premapped(vi->rq[i].vq)); + 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) @@ -2432,7 +2445,8 @@ 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) { - virtnet_rq_unmap(rq, buf, 0); + if (rq->do_dma) + virtnet_rq_unmap(rq, buf, 0); put_page(virt_to_head_page(buf)); } @@ -2546,7 +2560,8 @@ 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) { - virtnet_rq_unmap(rq, buf, 0); + if (rq->do_dma) + virtnet_rq_unmap(rq, buf, 0); put_page(virt_to_head_page(buf)); } @@ -5913,7 +5928,7 @@ 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].last_dma) + if (vi->rq[i].do_dma && 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); }