On Fri, 3 Feb 2023 09:39:25 +0100, Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx> wrote:
> On Thu, Feb 02, 2023 at 07:00:54PM +0800, Xuan Zhuo wrote:
> > The driver's tx napi is very important for XSK. It is responsible for
> > obtaining data from the XSK queue and sending it out.
> >
> > At the beginning, we need to trigger tx napi.
> >
> > Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>
> > ---
> > drivers/net/virtio/main.c | 12 +++-
> > drivers/net/virtio/xsk.c | 146 ++++++++++++++++++++++++++++++++++++++
> > drivers/net/virtio/xsk.h | 2 +
> > 3 files changed, 159 insertions(+), 1 deletion(-)
> >
>
> (...)
>
> > +static int virtnet_xsk_xmit_batch(struct send_queue *sq,
> > + struct xsk_buff_pool *pool,
> > + unsigned int budget,
> > + struct virtnet_sq_stats *stats)
> > +{
> > + int ret = XSK_XMIT_NO_BUDGET;
> > + struct xdp_desc desc;
> > + int err, packet = 0;
> > +
> > + while (budget-- > 0) {
> > + if (sq->vq->num_free < 2) {
> > + __free_old_xmit(sq, true, stats);
> > + if (sq->vq->num_free < 2) {
> > + ret = XSK_XMIT_DEV_BUSY;
> > + break;
> > + }
> > + }
> > +
> > + if (!xsk_tx_peek_desc(pool, &desc)) {
>
> anything that stopped from using xsk_tx_peek_release_desc_batch() ?
Great!
Will fix.
Thanks.
>
> > + ret = XSK_XMIT_DONE;
> > + break;
> > + }
> > +
> > + err = virtnet_xsk_xmit_one(sq, pool, &desc);
> > + if (unlikely(err)) {
> > + ret = XSK_XMIT_DEV_BUSY;
> > + break;
> > + }
> > +
> > + ++packet;
> > +
> > + if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
> > + ++stats->kicks;
> > + }
> > +
> > + if (packet) {
> > + stats->xdp_tx += packet;
> > +
> > + xsk_tx_release(pool);
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +bool virtnet_xsk_xmit(struct send_queue *sq, struct xsk_buff_pool *pool,
> > + int budget)
> > +{
> > + struct virtnet_sq_stats stats = {};
> > + bool busy;
> > + int ret;
> > +
> > + __free_old_xmit(sq, true, &stats);
> > +
> > + if (xsk_uses_need_wakeup(pool))
> > + xsk_set_tx_need_wakeup(pool);
> > +
> > + ret = virtnet_xsk_xmit_batch(sq, pool, budget, &stats);
> > + switch (ret) {
> > + case XSK_XMIT_DONE:
> > + /* xsk tx qeueu has been consumed done. should complete napi. */
> > + busy = false;
> > + break;
> > +
> > + case XSK_XMIT_NO_BUDGET:
> > + /* reach the budget limit. should let napi run again. */
> > + busy = true;
> > + break;
> > +
> > + case XSK_XMIT_DEV_BUSY:
> > + /* sq vring is full, should complete napi. wait for tx napi been
> > + * triggered by interrupt.
> > + */
> > + busy = false;
> > + break;
> > + }
> > +
> > + virtnet_xsk_check_queue(sq);
> > +
> > + u64_stats_update_begin(&sq->stats.syncp);
> > + sq->stats.packets += stats.packets;
> > + sq->stats.bytes += stats.bytes;
> > + sq->stats.kicks += stats.kicks;
> > + sq->stats.xdp_tx += stats.xdp_tx;
> > + u64_stats_update_end(&sq->stats.syncp);
> > +
> > + return busy;
> > +}
> > +
> > static int virtnet_rq_bind_xsk_pool(struct virtnet_info *vi, struct receive_queue *rq,
> > struct xsk_buff_pool *pool, struct net_device *dev)
> > {
> > diff --git a/drivers/net/virtio/xsk.h b/drivers/net/virtio/xsk.h
> > index ad684c812091..15f1540a5803 100644
> > --- a/drivers/net/virtio/xsk.h
> > +++ b/drivers/net/virtio/xsk.h
> > @@ -20,4 +20,6 @@ static inline u32 ptr_to_xsk(void *ptr)
> > }
> >
> > int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp);
> > +bool virtnet_xsk_xmit(struct send_queue *sq, struct xsk_buff_pool *pool,
> > + int budget);
> > #endif
> > --
> > 2.32.0.3.g01195cf9f
> >
