From patchwork Thu Feb 24 11:04:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 12758361 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3777EC43217 for ; Thu, 24 Feb 2022 11:04:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233771AbiBXLEx (ORCPT ); Thu, 24 Feb 2022 06:04:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232420AbiBXLEo (ORCPT ); Thu, 24 Feb 2022 06:04:44 -0500 Received: from out30-44.freemail.mail.aliyun.com (out30-44.freemail.mail.aliyun.com [115.124.30.44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9D30728F97A; Thu, 24 Feb 2022 03:04:14 -0800 (PST) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R511e4;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=11;SR=0;TI=SMTPD_---0V5OACdw_1645700651; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0V5OACdw_1645700651) by smtp.aliyun-inc.com(127.0.0.1); Thu, 24 Feb 2022 19:04:12 +0800 From: Xuan Zhuo To: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Jakub Kicinski , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , bpf@vger.kernel.org Subject: [PATCH v2 8/9] virtio_ring: introduce virtqueue_add_outbuf_premapped() Date: Thu, 24 Feb 2022 19:04:01 +0800 Message-Id: <20220224110402.108161-9-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20220224110402.108161-1-xuanzhuo@linux.alibaba.com> References: <20220224110402.108161-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: d02e086a8668 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Introduce virtqueue_add_outbuf_premapped() to submit premapped sgs. Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 25 +++++++++++++++++++++++++ include/linux/virtio.h | 5 +++++ 2 files changed, 30 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 6a1e0ef5498a..a76615aca2fd 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -1910,6 +1910,31 @@ int virtqueue_add_outbuf(struct virtqueue *vq, } EXPORT_SYMBOL_GPL(virtqueue_add_outbuf); +/** + * virtqueue_add_outbuf_premapped - expose output buffers to other end + * @vq: the struct virtqueue we're talking about. + * @sg: scatterlist (must be well-formed and terminated!) + * @num: the number of entries in @sg readable by other side + * @data: the token identifying the buffer. + * @gfp: how to do memory allocations (if necessary). + * + * Caller must ensure we don't call this with other virtqueue operations + * at the same time (except where noted). + * + * It is required that all addrs have completed DMA operations. And use + * sg->dma_address, sg->length to pass addr and length. + * + * Returns zero or a negative error (ie. ENOSPC, ENOMEM, EIO). + */ +int virtqueue_add_outbuf_premapped(struct virtqueue *vq, + struct scatterlist *sg, unsigned int num, + void *data, + gfp_t gfp) +{ + return virtqueue_add(vq, &sg, num, 1, 0, data, NULL, gfp, true); +} +EXPORT_SYMBOL_GPL(virtqueue_add_outbuf_premapped); + /** * virtqueue_add_inbuf - expose input buffers to other end * @vq: the struct virtqueue we're talking about. diff --git a/include/linux/virtio.h b/include/linux/virtio.h index e86ea3b1a124..dbe5a5f8a1ff 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -40,6 +40,11 @@ int virtqueue_add_outbuf(struct virtqueue *vq, void *data, gfp_t gfp); +int virtqueue_add_outbuf_premapped(struct virtqueue *vq, + struct scatterlist *sg, unsigned int num, + void *data, + gfp_t gfp); + int virtqueue_add_inbuf(struct virtqueue *vq, struct scatterlist sg[], unsigned int num, void *data,