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Message-Id: <20231229073108.57778-23-xuanzhuo@linux.alibaba.com>
Date: Fri, 29 Dec 2023 15:31:03 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.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-foundation.org,
bpf@...r.kernel.org
Subject: [PATCH net-next v3 22/27] virtio_net: xsk: rx: support fill with xsk buffer
Implement the logic of filling rq with XSK buffers.
Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
drivers/net/virtio/main.c | 9 +++++-
drivers/net/virtio/virtio_net.h | 2 ++
drivers/net/virtio/xsk.c | 51 ++++++++++++++++++++++++++++++++-
drivers/net/virtio/xsk.h | 2 ++
4 files changed, 62 insertions(+), 2 deletions(-)
diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
index 325d39c39792..264ab8aa5da5 100644
--- a/drivers/net/virtio/main.c
+++ b/drivers/net/virtio/main.c
@@ -1790,6 +1790,11 @@ static bool try_fill_recv(struct virtnet_info *vi, struct virtnet_rq *rq,
int err;
bool oom;
+ if (rq->xsk.pool) {
+ err = virtnet_add_recvbuf_xsk(vi, rq, rq->xsk.pool, gfp);
+ goto kick;
+ }
+
do {
if (vi->mergeable_rx_bufs)
err = add_recvbuf_mergeable(vi, rq, gfp);
@@ -1798,10 +1803,11 @@ static bool try_fill_recv(struct virtnet_info *vi, struct virtnet_rq *rq,
else
err = add_recvbuf_small(vi, rq, gfp);
- oom = err == -ENOMEM;
if (err)
break;
} while (rq->vq->num_free);
+
+kick:
if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) {
unsigned long flags;
@@ -1810,6 +1816,7 @@ static bool try_fill_recv(struct virtnet_info *vi, struct virtnet_rq *rq,
u64_stats_update_end_irqrestore(&rq->stats.syncp, flags);
}
+ oom = err == -ENOMEM;
return !oom;
}
diff --git a/drivers/net/virtio/virtio_net.h b/drivers/net/virtio/virtio_net.h
index f8b8f4f5b8b3..eaa5da0b0b3c 100644
--- a/drivers/net/virtio/virtio_net.h
+++ b/drivers/net/virtio/virtio_net.h
@@ -129,6 +129,8 @@ struct virtnet_rq {
/* xdp rxq used by xsk */
struct xdp_rxq_info xdp_rxq;
+
+ struct xdp_buff **xsk_buffs;
} xsk;
};
diff --git a/drivers/net/virtio/xsk.c b/drivers/net/virtio/xsk.c
index 0c6a8f92ae38..c54cd08e9c77 100644
--- a/drivers/net/virtio/xsk.c
+++ b/drivers/net/virtio/xsk.c
@@ -14,6 +14,47 @@ static void sg_fill_dma(struct scatterlist *sg, dma_addr_t addr, u32 len)
sg->length = len;
}
+int virtnet_add_recvbuf_xsk(struct virtnet_info *vi, struct virtnet_rq *rq,
+ struct xsk_buff_pool *pool, gfp_t gfp)
+{
+ struct xdp_buff **xsk_buffs;
+ dma_addr_t addr;
+ u32 len, i;
+ int err = 0;
+ int num;
+
+ xsk_buffs = rq->xsk.xsk_buffs;
+
+ num = xsk_buff_alloc_batch(pool, xsk_buffs, rq->vq->num_free);
+ if (!num)
+ return -ENOMEM;
+
+ len = xsk_pool_get_rx_frame_size(pool) + vi->hdr_len;
+
+ for (i = 0; i < num; ++i) {
+ /* use the part of XDP_PACKET_HEADROOM as the virtnet hdr space */
+ addr = xsk_buff_xdp_get_dma(xsk_buffs[i]) - vi->hdr_len;
+
+ 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);
+ if (err)
+ goto err;
+ }
+
+ return num;
+
+err:
+ if (i)
+ err = i;
+
+ for (; i < num; ++i)
+ xsk_buff_free(xsk_buffs[i]);
+
+ return err;
+}
+
static int virtnet_xsk_xmit_one(struct virtnet_sq *sq,
struct xsk_buff_pool *pool,
struct xdp_desc *desc)
@@ -210,7 +251,7 @@ static int virtnet_xsk_pool_enable(struct net_device *dev,
struct virtnet_sq *sq;
struct device *dma_dev;
dma_addr_t hdr_dma;
- int err;
+ int err, size;
/* In big_packets mode, xdp cannot work, so there is no need to
* initialize xsk of rq.
@@ -246,6 +287,12 @@ static int virtnet_xsk_pool_enable(struct net_device *dev,
if (!dma_dev)
return -EPERM;
+ size = virtqueue_get_vring_size(rq->vq);
+
+ rq->xsk.xsk_buffs = kcalloc(size, sizeof(*rq->xsk.xsk_buffs), GFP_KERNEL);
+ if (!rq->xsk.xsk_buffs)
+ return -ENOMEM;
+
hdr_dma = dma_map_single(dma_dev, &xsk_hdr, vi->hdr_len, DMA_TO_DEVICE);
if (dma_mapping_error(dma_dev, hdr_dma))
return -ENOMEM;
@@ -304,6 +351,8 @@ static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid)
dma_unmap_single(dma_dev, sq->xsk.hdr_dma_address, vi->hdr_len, DMA_TO_DEVICE);
+ kfree(rq->xsk.xsk_buffs);
+
return err1 | err2;
}
diff --git a/drivers/net/virtio/xsk.h b/drivers/net/virtio/xsk.h
index 7ebc9bda7aee..bef41a3f954e 100644
--- a/drivers/net/virtio/xsk.h
+++ b/drivers/net/virtio/xsk.h
@@ -23,4 +23,6 @@ int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp);
bool virtnet_xsk_xmit(struct virtnet_sq *sq, struct xsk_buff_pool *pool,
int budget);
int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag);
+int virtnet_add_recvbuf_xsk(struct virtnet_info *vi, struct virtnet_rq *rq,
+ struct xsk_buff_pool *pool, gfp_t gfp);
#endif
--
2.32.0.3.g01195cf9f
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