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Message-Id: <20240705073734.93905-9-xuanzhuo@linux.alibaba.com>
Date: Fri, 5 Jul 2024 15:37:32 +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 PĂ©rez <eperezma@...hat.com>,
"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 v7 08/10] 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>
---
v7:
1. some small fixes
drivers/net/virtio_net.c | 70 +++++++++++++++++++++++++++++++++++++---
1 file changed, 66 insertions(+), 4 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 29fa25ce1a7f..2b27f5ada64a 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -354,6 +354,8 @@ struct receive_queue {
/* xdp rxq used by xsk */
struct xdp_rxq_info xsk_rxq_info;
+
+ struct xdp_buff **xsk_buffs;
};
/* This structure can contain rss message with maximum settings for indirection table and keysize
@@ -1054,6 +1056,53 @@ 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 int virtnet_add_recvbuf_xsk(struct virtnet_info *vi, struct receive_queue *rq,
+ struct xsk_buff_pool *pool, gfp_t gfp)
+{
+ struct xdp_buff **xsk_buffs;
+ dma_addr_t addr;
+ int err = 0;
+ u32 len, i;
+ int num;
+
+ xsk_buffs = rq->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_wakeup(struct net_device *dev, u32 qid, u32 flag)
{
struct virtnet_info *vi = netdev_priv(dev);
@@ -2245,7 +2294,11 @@ static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
gfp_t gfp)
{
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)
@@ -2255,10 +2308,11 @@ static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *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;
@@ -2267,7 +2321,7 @@ static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
u64_stats_update_end_irqrestore(&rq->stats.syncp, flags);
}
- return !oom;
+ return err != -ENOMEM;
}
static void skb_recv_done(struct virtqueue *rvq)
@@ -5104,7 +5158,7 @@ static int virtnet_xsk_pool_enable(struct net_device *dev,
struct receive_queue *rq;
struct device *dma_dev;
struct send_queue *sq;
- int err;
+ int err, size;
if (vi->hdr_len > xsk_pool_get_headroom(pool))
return -EINVAL;
@@ -5135,6 +5189,12 @@ static int virtnet_xsk_pool_enable(struct net_device *dev,
if (!dma_dev)
return -EPERM;
+ size = virtqueue_get_vring_size(rq->vq);
+
+ rq->xsk_buffs = kvcalloc(size, sizeof(*rq->xsk_buffs), GFP_KERNEL);
+ if (!rq->xsk_buffs)
+ return -ENOMEM;
+
err = xsk_pool_dma_map(pool, dma_dev, 0);
if (err)
goto err_xsk_map;
@@ -5169,6 +5229,8 @@ static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid)
xsk_pool_dma_unmap(pool, 0);
+ kvfree(rq->xsk_buffs);
+
return err;
}
--
2.32.0.3.g01195cf9f
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