[RFC v2 Optimizing veth xsk performance 3/9] veth: add support for send queue

[Albert Huang <huangjie.albert@xxxxxxxxxxxxx>]

in order to support native af_xdp for veth. we
need support for send queue for napi tx.
the upcoming patch will make use of it.

Signed-off-by: Albert Huang <huangjie.albert@xxxxxxxxxxxxx>
---
 drivers/net/veth.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 77e12d52ca2b..25faba879505 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -56,6 +56,11 @@ struct veth_rq_stats {
 	struct u64_stats_sync	syncp;
 };
 
+struct veth_sq_stats {
+	struct veth_stats	vs;
+	struct u64_stats_sync	syncp;
+};
+
 struct veth_rq {
 	struct napi_struct	xdp_napi;
 	struct napi_struct __rcu *napi; /* points to xdp_napi when the latter is initialized */
@@ -69,11 +74,25 @@ struct veth_rq {
 	struct page_pool	*page_pool;
 };
 
+struct veth_sq {
+	struct napi_struct	xdp_napi;
+	struct net_device	*dev;
+	struct xdp_mem_info	xdp_mem;
+	struct veth_sq_stats	stats;
+	u32 queue_index;
+	/* for xsk */
+	struct {
+		struct xsk_buff_pool __rcu *pool;
+		u32 last_cpu;
+	} xsk;
+};
+
 struct veth_priv {
 	struct net_device __rcu	*peer;
 	atomic64_t		dropped;
 	struct bpf_prog		*_xdp_prog;
 	struct veth_rq		*rq;
+	struct veth_sq		*sq;
 	unsigned int		requested_headroom;
 };
 
@@ -1495,6 +1514,15 @@ static int veth_alloc_queues(struct net_device *dev)
 		u64_stats_init(&priv->rq[i].stats.syncp);
 	}
 
+	priv->sq = kcalloc(dev->num_tx_queues, sizeof(*priv->sq), GFP_KERNEL);
+	if (!priv->sq)
+		return -ENOMEM;
+
+	for (i = 0; i < dev->num_tx_queues; i++) {
+		priv->sq[i].dev = dev;
+		u64_stats_init(&priv->sq[i].stats.syncp);
+	}
+
 	return 0;
 }
 
@@ -1503,6 +1531,7 @@ static void veth_free_queues(struct net_device *dev)
 	struct veth_priv *priv = netdev_priv(dev);
 
 	kfree(priv->rq);
+	kfree(priv->sq);
 }
 
 static int veth_dev_init(struct net_device *dev)
-- 
2.20.1