netdev - [PATCH net-next v2 06/13] virtio-net: rq submits premapped per-buffer

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Message-Id: <20241030082453.97310-7-xuanzhuo@linux.alibaba.com>
Date: Wed, 30 Oct 2024 16:24:46 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: netdev@...r.kernel.org
Cc: "Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	virtualization@...ts.linux.dev,
	bpf@...r.kernel.org
Subject: [PATCH net-next v2 06/13] virtio-net: rq submits premapped per-buffer

virtio-net rq submits premapped per-buffer by setting sg page to NULL;

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/net/virtio_net.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 792e9eadbfc3..09757fa408bd 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -542,6 +542,12 @@ static struct sk_buff *ptr_to_skb(void *ptr)
 	return (struct sk_buff *)((unsigned long)ptr & ~VIRTIO_ORPHAN_FLAG);
 }
 
+static void sg_fill_dma(struct scatterlist *sg, dma_addr_t addr, u32 len)
+{
+	sg->dma_address = addr;
+	sg->length = len;
+}
+
 static void __free_old_xmit(struct send_queue *sq, struct netdev_queue *txq,
 			    bool in_napi, struct virtnet_sq_free_stats *stats)
 {
@@ -915,8 +921,7 @@ static void virtnet_rq_init_one_sg(struct receive_queue *rq, void *buf, u32 len)
 	addr = dma->addr - sizeof(*dma) + offset;
 
 	sg_init_table(rq->sg, 1);
-	rq->sg[0].dma_address = addr;
-	rq->sg[0].length = len;
+	sg_fill_dma(rq->sg, addr, len);
 }
 
 static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp)
@@ -1068,12 +1073,6 @@ static void check_sq_full_and_disable(struct virtnet_info *vi,
 	}
 }
 
-static void sg_fill_dma(struct scatterlist *sg, dma_addr_t addr, u32 len)
-{
-	sg->dma_address = addr;
-	sg->length = len;
-}
-
 static struct xdp_buff *buf_to_xdp(struct virtnet_info *vi,
 				   struct receive_queue *rq, void *buf, u32 len)
 {
@@ -1354,7 +1353,8 @@ static int virtnet_add_recvbuf_xsk(struct virtnet_info *vi, struct receive_queue
 		sg_init_table(rq->sg, 1);
 		sg_fill_dma(rq->sg, addr, len);
 
-		err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, xsk_buffs[i], gfp);
+		err = virtqueue_add_inbuf_premapped(rq->vq, rq->sg, 1, xsk_buffs[i],
+						    NULL, true, gfp);
 		if (err)
 			goto err;
 	}
@@ -2431,7 +2431,8 @@ static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,
 
 	virtnet_rq_init_one_sg(rq, buf, vi->hdr_len + GOOD_PACKET_LEN);
 
-	err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
+	err = virtqueue_add_inbuf_premapped(rq->vq, rq->sg, 1, buf, ctx,
+					    rq->do_dma, gfp);
 	if (err < 0) {
 		if (rq->do_dma)
 			virtnet_rq_unmap(rq, buf, 0);
@@ -2546,7 +2547,8 @@ static int add_recvbuf_mergeable(struct virtnet_info *vi,
 	virtnet_rq_init_one_sg(rq, buf, len);
 
 	ctx = mergeable_len_to_ctx(len + room, headroom);
-	err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);
+	err = virtqueue_add_inbuf_premapped(rq->vq, rq->sg, 1, buf, ctx,
+					    rq->do_dma, gfp);
 	if (err < 0) {
 		if (rq->do_dma)
 			virtnet_rq_unmap(rq, buf, 0);
-- 
2.32.0.3.g01195cf9f