From patchwork Tue Jun 18 07:56:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13701933 X-Patchwork-Delegate: kuba@kernel.org Received: from out30-131.freemail.mail.aliyun.com (out30-131.freemail.mail.aliyun.com [115.124.30.131]) (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 7BFB119DF52; Tue, 18 Jun 2024 07:56:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718697414; cv=none; b=clzQV4L6TO8Oisub/3lQthFiSF3OplI5j4dFFS+o39Dfyfn4iWJYUW//X8yHW0Tv8++fSk7LA/WVDsbWrqnWw5AAYDS3IDJmqRKgd/KV9agf2a9BrZXEfXfqhlMT447hTV6lHAr/dxtkPUrxJQdAs5FRq5KCHVsTauqbtcLC+hE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718697414; c=relaxed/simple; bh=81jKwSP9mEk3E0srgFqnQDByqnSsL1FMzui52ddBVbE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ne3IpPppkP39+UETgdd79o9ZiIG2PR9ZmX+EOPkaHa3gkCTR2KAbEHuEAZfXPSgyL8NT3hrfZjqqIz9znkfCGwgLJe75X3qHwKS16+hqfyv6w1kPIyrD3ZVUgNZIPVRzyb/rsrbyhDFtZzCNY2d+e72VB5OBLSVXDN4Qjx/4J+0= 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=eizUD6ie; arc=none smtp.client-ip=115.124.30.131 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="eizUD6ie" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1718697409; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=jZdafehs1I/lJ1gO3eTqykAyR0TfAHagYOrrfSYWEIs=; b=eizUD6ie3e4QgCj8xZY4bKNYMBQ+l3GUoclRuHA9jdYe8AFuSCGtMUeCq3zvUBHFEYegIi8kcKZmbrrrQl6VboaVEx22zfCYYqj0Esr771f3Asf6y1DLF9pZj4Ew8qMe+8KsaZOxMSjfvC2xLjVt5y9RDDvdVvyvRr5yx29VxcU= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R981e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037067110;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=15;SR=0;TI=SMTPD_---0W8jSd4B_1718697408; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0W8jSd4B_1718697408) by smtp.aliyun-inc.com; Tue, 18 Jun 2024 15:56:49 +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 , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , virtualization@lists.linux.dev, bpf@vger.kernel.org Subject: [PATCH net-next v6 05/10] virtio_net: xsk: bind/unbind xsk for rx Date: Tue, 18 Jun 2024 15:56:38 +0800 Message-Id: <20240618075643.24867-6-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240618075643.24867-1-xuanzhuo@linux.alibaba.com> References: <20240618075643.24867-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: 8baa0af3684b X-Patchwork-Delegate: kuba@kernel.org This patch implement the logic of bind/unbind xsk pool to rq. Signed-off-by: Xuan Zhuo --- drivers/net/virtio_net.c | 133 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 133 insertions(+) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index df885cdbe658..d8cce143be26 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -25,6 +25,7 @@ #include #include #include +#include static int napi_weight = NAPI_POLL_WEIGHT; module_param(napi_weight, int, 0444); @@ -348,6 +349,13 @@ struct receive_queue { /* Record the last dma info to free after new pages is allocated. */ struct virtnet_rq_dma *last_dma; + + struct { + struct xsk_buff_pool *pool; + + /* xdp rxq used by xsk */ + struct xdp_rxq_info xdp_rxq; + } xsk; }; /* This structure can contain rss message with maximum settings for indirection table and keysize @@ -4970,6 +4978,129 @@ static int virtnet_restore_guest_offloads(struct virtnet_info *vi) return virtnet_set_guest_offloads(vi, offloads); } +static int virtnet_rq_bind_xsk_pool(struct virtnet_info *vi, struct receive_queue *rq, + struct xsk_buff_pool *pool) +{ + int err, qindex; + + qindex = rq - vi->rq; + + if (pool) { + err = xdp_rxq_info_reg(&rq->xsk.xdp_rxq, vi->dev, qindex, rq->napi.napi_id); + if (err < 0) + return err; + + err = xdp_rxq_info_reg_mem_model(&rq->xsk.xdp_rxq, + MEM_TYPE_XSK_BUFF_POOL, NULL); + if (err < 0) + goto unreg; + + xsk_pool_set_rxq_info(pool, &rq->xsk.xdp_rxq); + } + + virtnet_rx_pause(vi, rq); + + err = virtqueue_reset(rq->vq, virtnet_rq_unmap_free_buf); + if (err) { + netdev_err(vi->dev, "reset rx fail: rx queue index: %d err: %d\n", qindex, err); + + pool = NULL; + } + + rq->xsk.pool = pool; + + virtnet_rx_resume(vi, rq); + + if (pool) + return 0; + +unreg: + xdp_rxq_info_unreg(&rq->xsk.xdp_rxq); + return err; +} + +static int virtnet_xsk_pool_enable(struct net_device *dev, + struct xsk_buff_pool *pool, + u16 qid) +{ + struct virtnet_info *vi = netdev_priv(dev); + struct receive_queue *rq; + struct device *dma_dev; + struct send_queue *sq; + int err; + + /* In big_packets mode, xdp cannot work, so there is no need to + * initialize xsk of rq. + */ + if (vi->big_packets && !vi->mergeable_rx_bufs) + return -ENOENT; + + if (qid >= vi->curr_queue_pairs) + return -EINVAL; + + sq = &vi->sq[qid]; + rq = &vi->rq[qid]; + + /* For the xsk, the tx and rx should have the same device. The af-xdp + * may use one buffer to receive from the rx and reuse this buffer to + * send by the tx. So the dma dev of sq and rq should be the same one. + * + * But vq->dma_dev allows every vq has the respective dma dev. So I + * check the dma dev of vq and sq is the same dev. + */ + if (virtqueue_dma_dev(rq->vq) != virtqueue_dma_dev(sq->vq)) + return -EPERM; + + dma_dev = virtqueue_dma_dev(rq->vq); + if (!dma_dev) + return -EPERM; + + err = xsk_pool_dma_map(pool, dma_dev, 0); + if (err) + goto err_xsk_map; + + err = virtnet_rq_bind_xsk_pool(vi, rq, pool); + if (err) + goto err_rq; + + return 0; + +err_rq: + xsk_pool_dma_unmap(pool, 0); +err_xsk_map: + return err; +} + +static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid) +{ + struct virtnet_info *vi = netdev_priv(dev); + struct xsk_buff_pool *pool; + struct receive_queue *rq; + int err; + + if (qid >= vi->curr_queue_pairs) + return -EINVAL; + + rq = &vi->rq[qid]; + + pool = rq->xsk.pool; + + err = virtnet_rq_bind_xsk_pool(vi, rq, NULL); + + xsk_pool_dma_unmap(pool, 0); + + return err; +} + +static int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp) +{ + if (xdp->xsk.pool) + return virtnet_xsk_pool_enable(dev, xdp->xsk.pool, + xdp->xsk.queue_id); + else + return virtnet_xsk_pool_disable(dev, xdp->xsk.queue_id); +} + static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, struct netlink_ext_ack *extack) { @@ -5095,6 +5226,8 @@ static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) switch (xdp->command) { case XDP_SETUP_PROG: return virtnet_xdp_set(dev, xdp->prog, xdp->extack); + case XDP_SETUP_XSK_POOL: + return virtnet_xsk_pool_setup(dev, xdp); default: return -EINVAL; }