This patch implement the logic of bind/unbind xsk pool to rq.
Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
---
v7:
1. remove a container struct for xsk
2. update comments
3. add check between hdr_len and xsk headroom
drivers/net/virtio_net.c | 134 +++++++++++++++++++++++++++++++++++++++
1 file changed, 134 insertions(+)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 3c828cdd438b..cd87b39600d4 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -25,6 +25,7 @@
#include <net/net_failover.h>
#include <net/netdev_rx_queue.h>
#include <net/netdev_queues.h>
+#include <net/xdp_sock_drv.h>
static int napi_weight = NAPI_POLL_WEIGHT;
module_param(napi_weight, int, 0444);
@@ -348,6 +349,11 @@ struct receive_queue {
/* Record the last dma info to free after new pages is allocated. */
struct virtnet_rq_dma *last_dma;
+
+ struct xsk_buff_pool *xsk_pool;
+
+ /* xdp rxq used by xsk */
+ struct xdp_rxq_info xsk_rxq_info;
};
/* This structure can contain rss message with maximum settings for indirection table and keysize
@@ -5026,6 +5032,132 @@ static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
return virtnet_set_guest_offloads(vi, offloads);
}
+static int virtnet_rq_bind_xsk_pool(struct virtnet_info *vi, struct receive_queue *rq,
+ struct xsk_buff_pool *pool)
+{
+ int err, qindex;
+
+ qindex = rq - vi->rq;
+
+ if (pool) {
+ err = xdp_rxq_info_reg(&rq->xsk_rxq_info, vi->dev, qindex, rq->napi.napi_id);
+ if (err < 0)
+ return err;
+
+ err = xdp_rxq_info_reg_mem_model(&rq->xsk_rxq_info,
+ MEM_TYPE_XSK_BUFF_POOL, NULL);
+ if (err < 0)
+ goto unreg;
+
+ xsk_pool_set_rxq_info(pool, &rq->xsk_rxq_info);
+ }
+
+ virtnet_rx_pause(vi, rq);
+
+ err = virtqueue_reset(rq->vq, virtnet_rq_unmap_free_buf);
+ if (err) {
+ netdev_err(vi->dev, "reset rx fail: rx queue index: %d err: %d\n", qindex, err);
+
+ pool = NULL;
+ }
+
+ rq->xsk_pool = pool;
+
+ virtnet_rx_resume(vi, rq);
+
+ if (pool)
+ return 0;
+
+unreg:
+ xdp_rxq_info_unreg(&rq->xsk_rxq_info);
+ 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 device *dma_dev;
+ struct send_queue *sq;
+ int err;
+
+ if (vi->hdr_len > xsk_pool_get_headroom(pool))
+ return -EINVAL;
+
+ /* 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;
+
+ if (qid >= vi->curr_queue_pairs)
+ return -EINVAL;
+
+ sq = &vi->sq[qid];
+ rq = &vi->rq[qid];
+
+ /* xsk assumes that tx and rx must have the same dma device. The af-xdp
+ * may use one buffer to receive from the rx and reuse this buffer to
+ * send by the tx. So the dma dev of sq and rq must be the same one.
+ *
+ * But vq->dma_dev allows every vq has the respective dma dev. So I
+ * check the dma dev of vq and sq is the same dev.
+ */
+ if (virtqueue_dma_dev(rq->vq) != virtqueue_dma_dev(sq->vq))
+ return -EPERM;
+
+ dma_dev = virtqueue_dma_dev(rq->vq);
+ if (!dma_dev)
+ return -EPERM;
+
+ err = xsk_pool_dma_map(pool, dma_dev, 0);
+ if (err)
+ goto err_xsk_map;
+
+ err = virtnet_rq_bind_xsk_pool(vi, rq, pool);
+ if (err)
+ goto err_rq;
+
+ return 0;
+
+err_rq:
+ xsk_pool_dma_unmap(pool, 0);
+err_xsk_map:
+ return err;
+}
+
+static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ struct xsk_buff_pool *pool;
+ struct receive_queue *rq;
+ int err;
+
+ if (qid >= vi->curr_queue_pairs)
+ return -EINVAL;
+
+ rq = &vi->rq[qid];
+
+ pool = rq->xsk_pool;
+
+ err = virtnet_rq_bind_xsk_pool(vi, rq, NULL);
+
+ xsk_pool_dma_unmap(pool, 0);
+
+ return err;
+}
+
+static int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp)
+{
+ if (xdp->xsk.pool)
+ return virtnet_xsk_pool_enable(dev, xdp->xsk.pool,
+ xdp->xsk.queue_id);
+ else
+ return virtnet_xsk_pool_disable(dev, xdp->xsk.queue_id);
+}
+
static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
struct netlink_ext_ack *extack)
{
@@ -5151,6 +5283,8 @@ static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
switch (xdp->command) {
case XDP_SETUP_PROG:
return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
+ case XDP_SETUP_XSK_POOL:
+ return virtnet_xsk_pool_setup(dev, xdp);
default:
return -EINVAL;
}
--
2.32.0.3.g01195cf9f
