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Message-ID: <1718610681.9219804-5-xuanzhuo@linux.alibaba.com>
Date: Mon, 17 Jun 2024 15:51:21 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: Jason Wang <jasowang@...hat.com>
Cc: netdev@...r.kernel.org,
"Michael S. Tsirkin" <mst@...hat.com>,
Eugenio Pérez <eperezma@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
virtualization@...ts.linux.dev,
bpf@...r.kernel.org
Subject: Re: [PATCH net-next v5 11/15] virtio_net: xsk: tx: support xmit xsk buffer
On Mon, 17 Jun 2024 14:30:07 +0800, Jason Wang <jasowang@...hat.com> wrote:
> On Fri, Jun 14, 2024 at 2:40 PM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> 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@...ux.alibaba.com>
> > ---
> > drivers/net/virtio_net.c | 121 ++++++++++++++++++++++++++++++++++++++-
> > 1 file changed, 119 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> > index 2767338dc060..7e811f392768 100644
> > --- a/drivers/net/virtio_net.c
> > +++ b/drivers/net/virtio_net.c
> > @@ -535,10 +535,13 @@ enum virtnet_xmit_type {
> > VIRTNET_XMIT_TYPE_SKB,
> > VIRTNET_XMIT_TYPE_XDP,
> > VIRTNET_XMIT_TYPE_DMA,
> > + VIRTNET_XMIT_TYPE_XSK,
> > };
> >
> > #define VIRTNET_XMIT_TYPE_MASK (VIRTNET_XMIT_TYPE_SKB | VIRTNET_XMIT_TYPE_XDP \
> > - | VIRTNET_XMIT_TYPE_DMA)
> > + | VIRTNET_XMIT_TYPE_DMA | VIRTNET_XMIT_TYPE_XSK)
> > +
> > +#define VIRTIO_XSK_FLAG_OFFSET 4
> >
> > static enum virtnet_xmit_type virtnet_xmit_ptr_strip(void **ptr)
> > {
> > @@ -768,6 +771,10 @@ static void __free_old_xmit(struct send_queue *sq, bool in_napi,
> > * func again.
> > */
> > goto retry;
> > +
> > + case VIRTNET_XMIT_TYPE_XSK:
> > + /* Make gcc happy. DONE in subsequent commit */
>
> This is probably a hint that the next patch should be squashed here.
The code for the xmit patch is more. So I separate the code out.
>
> > + break;
> > }
> > }
> > }
> > @@ -1265,6 +1272,102 @@ static void check_sq_full_and_disable(struct virtnet_info *vi,
> > }
> > }
> >
> > +static void *virtnet_xsk_to_ptr(u32 len)
> > +{
> > + unsigned long p;
> > +
> > + p = len << VIRTIO_XSK_FLAG_OFFSET;
> > +
> > + return virtnet_xmit_ptr_mix((void *)p, VIRTNET_XMIT_TYPE_XSK);
> > +}
> > +
> > +static void sg_fill_dma(struct scatterlist *sg, dma_addr_t addr, u32 len)
> > +{
> > + sg->dma_address = addr;
> > + sg->length = len;
> > +}
> > +
> > +static int virtnet_xsk_xmit_one(struct send_queue *sq,
> > + struct xsk_buff_pool *pool,
> > + struct xdp_desc *desc)
> > +{
> > + struct virtnet_info *vi;
> > + dma_addr_t addr;
> > +
> > + vi = sq->vq->vdev->priv;
> > +
> > + addr = xsk_buff_raw_get_dma(pool, desc->addr);
> > + xsk_buff_raw_dma_sync_for_device(pool, addr, desc->len);
> > +
> > + sg_init_table(sq->sg, 2);
> > +
> > + sg_fill_dma(sq->sg, sq->xsk.hdr_dma_address, vi->hdr_len);
> > + sg_fill_dma(sq->sg + 1, addr, desc->len);
> > +
> > + return virtqueue_add_outbuf(sq->vq, sq->sg, 2,
> > + virtnet_xsk_to_ptr(desc->len), GFP_ATOMIC);
> > +}
> > +
> > +static int virtnet_xsk_xmit_batch(struct send_queue *sq,
> > + struct xsk_buff_pool *pool,
> > + unsigned int budget,
> > + u64 *kicks)
> > +{
> > + struct xdp_desc *descs = pool->tx_descs;
> > + bool kick = false;
> > + u32 nb_pkts, i;
> > + int err;
> > +
> > + budget = min_t(u32, budget, sq->vq->num_free);
> > +
> > + nb_pkts = xsk_tx_peek_release_desc_batch(pool, budget);
> > + if (!nb_pkts)
> > + return 0;
> > +
> > + for (i = 0; i < nb_pkts; i++) {
> > + err = virtnet_xsk_xmit_one(sq, pool, &descs[i]);
> > + if (unlikely(err)) {
> > + xsk_tx_completed(sq->xsk.pool, nb_pkts - i);
> > + break;
>
> Any reason we don't need a kick here?
After the loop, I checked the kick.
Do you mean kick for the packet that encountered the error?
>
> > + }
> > +
> > + kick = true;
> > + }
> > +
> > + if (kick && virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq))
> > + (*kicks)++;
> > +
> > + return i;
> > +}
> > +
> > +static bool virtnet_xsk_xmit(struct send_queue *sq, struct xsk_buff_pool *pool,
> > + int budget)
> > +{
> > + struct virtnet_info *vi = sq->vq->vdev->priv;
> > + struct virtnet_sq_free_stats stats = {};
> > + u64 kicks = 0;
> > + int sent;
> > +
> > + __free_old_xmit(sq, true, &stats);
> > +
> > + sent = virtnet_xsk_xmit_batch(sq, pool, budget, &kicks);
> > +
> > + if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq))
> > + check_sq_full_and_disable(vi, vi->dev, sq);
> > +
> > + u64_stats_update_begin(&sq->stats.syncp);
> > + u64_stats_add(&sq->stats.packets, stats.packets);
> > + u64_stats_add(&sq->stats.bytes, stats.bytes);
> > + u64_stats_add(&sq->stats.kicks, kicks);
> > + u64_stats_add(&sq->stats.xdp_tx, sent);
> > + u64_stats_update_end(&sq->stats.syncp);
> > +
> > + if (xsk_uses_need_wakeup(pool))
> > + xsk_set_tx_need_wakeup(pool);
> > +
> > + return sent == budget;
> > +}
> > +
> > static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
> > struct send_queue *sq,
> > struct xdp_frame *xdpf)
> > @@ -2707,6 +2810,7 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget)
> > struct virtnet_info *vi = sq->vq->vdev->priv;
> > unsigned int index = vq2txq(sq->vq);
> > struct netdev_queue *txq;
> > + bool xsk_busy = false;
> > int opaque;
> > bool done;
> >
> > @@ -2719,7 +2823,11 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget)
> > txq = netdev_get_tx_queue(vi->dev, index);
> > __netif_tx_lock(txq, raw_smp_processor_id());
> > virtqueue_disable_cb(sq->vq);
> > - free_old_xmit(sq, true);
> > +
> > + if (sq->xsk.pool)
> > + xsk_busy = virtnet_xsk_xmit(sq, sq->xsk.pool, budget);
>
> How about rename this to "xsk_sent"?
OK
Thanks.
>
> > + else
> > + free_old_xmit(sq, true);
> >
> > if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) {
> > if (netif_tx_queue_stopped(txq)) {
> > @@ -2730,6 +2838,11 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget)
> > netif_tx_wake_queue(txq);
> > }
> >
> > + if (xsk_busy) {
> > + __netif_tx_unlock(txq);
> > + return budget;
> > + }
> > +
> > opaque = virtqueue_enable_cb_prepare(sq->vq);
> >
> > done = napi_complete_done(napi, 0);
> > @@ -5715,6 +5828,10 @@ 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:
> > + /* Make gcc happy. DONE in subsequent commit */
> > + break;
> > }
> > }
> >
> > --
> > 2.32.0.3.g01195cf9f
> >
>
> Thanks
>
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