[PATCH net-next v2 14/21] virtio_net: xsk: tx: virtnet_free_old_xmit() distinguishes xsk buffer

Xuan Zhuo
2023-11-07T03:12:50Z

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/virtio_net.h | 18 ++++++++++++++++--
drivers/net/virtio/xsk.h | 5 +++++
2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio/virtio_net.h b/drivers/net/virtio/virtio_net.h
index a431a2c1ee47..a13d6d301fdb 100644
--- a/drivers/net/virtio/virtio_net.h
+++ b/drivers/net/virtio/virtio_net.h
@@ -225,6 +225,11 @@ struct virtnet_info {
struct failover *failover;
};

+static inline bool virtnet_is_skb_ptr(void *ptr)
+{
+ return !((unsigned long)ptr & VIRTIO_XMIT_DATA_MASK);
+}
+
static inline bool virtnet_is_xdp_frame(void *ptr)
{
return (unsigned long)ptr & VIRTIO_XDP_FLAG;
@@ -235,6 +240,8 @@ static inline struct xdp_frame *virtnet_ptr_to_xdp(void *ptr)
return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG);
}

+static inline u32 virtnet_ptr_to_xsk(void *ptr);
+
static inline void *virtnet_sq_unmap(struct virtnet_sq *sq, void *data)
{
struct virtnet_sq_dma *next, *head;
@@ -261,11 +268,12 @@ static inline void *virtnet_sq_unmap(struct virtnet_sq *sq, void *data)
static inline void virtnet_free_old_xmit(struct virtnet_sq *sq, bool in_napi,
u64 *bytes, u64 *packets)
{
+ unsigned int xsknum = 0;
unsigned int len;
void *ptr;

while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) {
- if (!virtnet_is_xdp_frame(ptr)) {
+ if (virtnet_is_skb_ptr(ptr)) {
struct sk_buff *skb;

if (sq->do_dma)
@@ -277,7 +285,7 @@ static inline void virtnet_free_old_xmit(struct virtnet_sq *sq, bool in_napi,

*bytes += skb->len;
napi_consume_skb(skb, in_napi);
- } else {
+ } else if (virtnet_is_xdp_frame(ptr)) {
struct xdp_frame *frame;

if (sq->do_dma)
@@ -287,9 +295,15 @@ static inline void virtnet_free_old_xmit(struct virtnet_sq *sq, bool in_napi,

*bytes += xdp_get_frame_len(frame);
xdp_return_frame(frame);
+ } else {
+ *bytes += virtnet_ptr_to_xsk(ptr);
+ ++xsknum;
}
(*packets)++;
}
+
+ if (xsknum)
+ xsk_tx_completed(sq->xsk.pool, xsknum);
}

static inline bool virtnet_is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q)
diff --git a/drivers/net/virtio/xsk.h b/drivers/net/virtio/xsk.h
index 1bd19dcda649..7ebc9bda7aee 100644
--- a/drivers/net/virtio/xsk.h
+++ b/drivers/net/virtio/xsk.h
@@ -14,6 +14,11 @@ static inline void *virtnet_xsk_to_ptr(u32 len)
return (void *)(p | VIRTIO_XSK_FLAG);
}

+static inline u32 virtnet_ptr_to_xsk(void *ptr)
+{
+ return ((unsigned long)ptr) >> VIRTIO_XSK_FLAG_OFFSET;
+}
+
int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp);
bool virtnet_xsk_xmit(struct virtnet_sq *sq, struct xsk_buff_pool *pool,
int budget);
--
2.32.0.3.g01195cf9f