[PATCH net-next v4 13/15] virtio_net: xsk: tx: handle the transmitted xsk buffer
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2024-06-11 11:42:04
Also in:
bpf, virtualization
Subsystem:
networking drivers, the rest, virtio net driver · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, "Michael S. Tsirkin", Jason Wang
virtnet_free_old_xmit distinguishes three type ptr(skb, xdp frame, xsk buffer) by the last bits of the pointer. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- drivers/net/virtio_net.c | 60 ++++++++++++++++++++++++++++++++++------ 1 file changed, 52 insertions(+), 8 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 7f8ef93a194a..d38b4ef80f6f 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c@@ -87,6 +87,7 @@ struct virtnet_stat_desc { struct virtnet_sq_free_stats { u64 packets; u64 bytes; + u64 xsk; }; struct virtnet_sq_stats {
@@ -529,6 +530,7 @@ struct virtio_net_common_hdr { }; static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf); +static void virtnet_xsk_completed(struct send_queue *sq, int num); enum virtnet_xmit_type { VIRTNET_XMIT_TYPE_SKB,
@@ -730,6 +732,11 @@ static int virtnet_sq_set_premapped(struct send_queue *sq, bool premapped) return 0; } +static u32 virtnet_ptr_to_xsk(void *ptr) +{ + return ((unsigned long)ptr) >> VIRTIO_XSK_FLAG_OFFSET; +} + static void __free_old_xmit(struct send_queue *sq, bool in_napi, struct virtnet_sq_free_stats *stats) {
@@ -762,10 +769,24 @@ static void __free_old_xmit(struct send_queue *sq, bool in_napi, case VIRTNET_XMIT_TYPE_DMA: virtnet_sq_unmap(sq, &ptr); goto retry; + + case VIRTNET_XMIT_TYPE_XSK: + stats->bytes += virtnet_ptr_to_xsk(ptr); + stats->xsk++; + break; } } } +static void virtnet_free_old_xmit(struct send_queue *sq, bool in_napi, + struct virtnet_sq_free_stats *stats) +{ + __free_old_xmit(sq, in_napi, stats); + + if (stats->xsk) + virtnet_xsk_completed(sq, stats->xsk); +} + /* Converting between virtqueue no. and kernel tx/rx queue no. * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq */
@@ -1194,7 +1215,7 @@ static void free_old_xmit(struct send_queue *sq, bool in_napi) { struct virtnet_sq_free_stats stats = {0}; - __free_old_xmit(sq, in_napi, &stats); + virtnet_free_old_xmit(sq, in_napi, &stats); /* Avoid overhead when no packets have been processed * happens when called speculatively from start_xmit.
@@ -1335,8 +1356,12 @@ static bool virtnet_xsk_xmit(struct send_queue *sq, struct xsk_buff_pool *pool, u64 kicks = 0; int sent; + /* Avoid to wakeup napi meanless, so call __free_old_xmit. */ __free_old_xmit(sq, true, &stats); + if (stats.xsk) + xsk_tx_completed(sq->xsk.pool, stats.xsk); + sent = virtnet_xsk_xmit_batch(sq, pool, budget, &kicks); if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq))
@@ -1355,6 +1380,16 @@ static bool virtnet_xsk_xmit(struct send_queue *sq, struct xsk_buff_pool *pool, return sent == budget; } +static void xsk_wakeup(struct send_queue *sq) +{ + if (napi_if_scheduled_mark_missed(&sq->napi)) + return; + + local_bh_disable(); + virtqueue_napi_schedule(&sq->napi, sq->vq); + local_bh_enable(); +} + static int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag) { struct virtnet_info *vi = netdev_priv(dev);
@@ -1368,14 +1403,19 @@ static int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag) sq = &vi->sq[qid]; - if (napi_if_scheduled_mark_missed(&sq->napi)) - return 0; + xsk_wakeup(sq); + return 0; +} - local_bh_disable(); - virtqueue_napi_schedule(&sq->napi, sq->vq); - local_bh_enable(); +static void virtnet_xsk_completed(struct send_queue *sq, int num) +{ + xsk_tx_completed(sq->xsk.pool, num); - return 0; + /* If this is called by rx poll, start_xmit and xdp xmit we should + * wakeup the tx napi to consume the xsk tx queue, because the tx + * interrupt may not be triggered. + */ + xsk_wakeup(sq); } static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
@@ -1491,7 +1531,7 @@ static int virtnet_xdp_xmit(struct net_device *dev, } /* Free up any pending old buffers before queueing new ones. */ - __free_old_xmit(sq, false, &stats); + virtnet_free_old_xmit(sq, false, &stats); for (i = 0; i < n; i++) { struct xdp_frame *xdpf = frames[i];
@@ -5839,6 +5879,10 @@ static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf) case VIRTNET_XMIT_TYPE_DMA: virtnet_sq_unmap(sq, &buf); goto retry; + + case VIRTNET_XMIT_TYPE_XSK: + xsk_tx_completed(sq->xsk.pool, 1); + break; } }
--
2.32.0.3.g01195cf9f