Introduce virtnet_xsk_pool_enable() for xsk setup.
Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
---
drivers/net/virtio/xsk.c | 59 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 59 insertions(+)
diff --git a/drivers/net/virtio/xsk.c b/drivers/net/virtio/xsk.c
index e01ff2abea11..a7e8005233d2 100644
--- a/drivers/net/virtio/xsk.c
+++ b/drivers/net/virtio/xsk.c
@@ -5,6 +5,8 @@
#include "virtio_net.h"
+static struct virtio_net_hdr_mrg_rxbuf xsk_hdr;
+
static int virtnet_rq_bind_xsk_pool(struct virtnet_info *vi, struct receive_queue *rq,
struct xsk_buff_pool *pool, struct net_device *dev)
{
@@ -54,3 +56,60 @@ static int virtnet_rq_bind_xsk_pool(struct virtnet_info *vi, struct receive_queu
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 send_queue *sq;
+ int err;
+
+ if (qid >= vi->curr_queue_pairs)
+ return -EINVAL;
+
+ sq = &vi->sq[qid];
+ rq = &vi->rq[qid];
+
+ /* xsk zerocopy depend on the tx napi.
+ *
+ * All xsk packets are actually consumed and sent out from the xsk tx
+ * queue under the tx napi mechanism.
+ */
+ if (!sq->napi.weight)
+ return -EPERM;
+
+ /* 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;
+
+ sq->xsk.hdr_dma_address = virtio_dma_map(&vi->vdev->dev, &xsk_hdr,
+ vi->hdr_len, DMA_TO_DEVICE);
+ if (virtio_dma_mapping_error(&vi->vdev->dev, sq->xsk.hdr_dma_address))
+ return -ENOMEM;
+
+ err = xsk_pool_dma_map(pool, &vi->vdev->dev, 0);
+ if (err)
+ goto err_xsk_map;
+
+ err = virtnet_rq_bind_xsk_pool(vi, rq, pool, dev);
+ if (err)
+ goto err_rxq;
+
+ /* Here is already protected by rtnl_lock, so rcu_assign_pointer
+ * is safe.
+ */
+ rcu_assign_pointer(sq->xsk.pool, pool);
+
+ return 0;
+
+err_rxq:
+ xsk_pool_dma_unmap(pool, 0);
+err_xsk_map:
+ virtio_dma_unmap(&vi->vdev->dev, sq->xsk.hdr_dma_address, vi->hdr_len,
+ DMA_TO_DEVICE);
+ return err;
+}
--
2.32.0.3.g01195cf9f
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