netdev - Re: [PATCH 32/33] virtio_net: xsk: rx: introduce add_recvbuf

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Date:   Fri, 3 Feb 2023 09:43:55 +0100
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
CC:     <netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        "Daniel Borkmann" <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Menglong Dong <imagedong@...cent.com>,
        "Kuniyuki Iwashima" <kuniyu@...zon.com>,
        Petr Machata <petrm@...dia.com>,
        <virtualization@...ts.linux-foundation.org>, <bpf@...r.kernel.org>
Subject: Re: [PATCH 32/33] virtio_net: xsk: rx: introduce add_recvbuf_xsk()

On Thu, Feb 02, 2023 at 07:00:57PM +0800, Xuan Zhuo wrote:
> Implement the logic of filling vq with XSK buffer.
> 
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> ---
>  drivers/net/virtio/main.c | 11 +++++++++++
>  drivers/net/virtio/xsk.c  | 26 ++++++++++++++++++++++++++
>  drivers/net/virtio/xsk.h  |  2 ++
>  3 files changed, 39 insertions(+)
> 
> diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c
> index 7259b27f5cba..2aff0eee35d3 100644
> --- a/drivers/net/virtio/main.c
> +++ b/drivers/net/virtio/main.c
> @@ -1352,10 +1352,20 @@ static int add_recvbuf_mergeable(struct virtnet_info *vi,
>   */
>  bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, gfp_t gfp)
>  {
> +	struct xsk_buff_pool *pool;
>  	int err;
>  	bool oom;
>  
>  	do {
> +		rcu_read_lock();
> +		pool = rcu_dereference(rq->xsk.pool);
> +		if (pool) {
> +			err = add_recvbuf_xsk(vi, rq, pool, gfp);
> +			rcu_read_unlock();
> +			goto check;
> +		}
> +		rcu_read_unlock();
> +
>  		if (vi->mergeable_rx_bufs)
>  			err = add_recvbuf_mergeable(vi, rq, gfp);
>  		else if (vi->big_packets)
> @@ -1363,6 +1373,7 @@ bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, gfp_t gfp)
>  		else
>  			err = add_recvbuf_small(vi, rq, gfp);
>  
> +check:
>  		oom = err == -ENOMEM;
>  		if (err)
>  			break;
> diff --git a/drivers/net/virtio/xsk.c b/drivers/net/virtio/xsk.c
> index 043b0bf2a5d7..a5e88f919c46 100644
> --- a/drivers/net/virtio/xsk.c
> +++ b/drivers/net/virtio/xsk.c
> @@ -37,6 +37,32 @@ static void virtnet_xsk_check_queue(struct send_queue *sq)
>  		netif_stop_subqueue(dev, qnum);
>  }
>  
> +int add_recvbuf_xsk(struct virtnet_info *vi, struct receive_queue *rq,
> +		    struct xsk_buff_pool *pool, gfp_t gfp)
> +{
> +	struct xdp_buff *xdp;
> +	dma_addr_t addr;
> +	u32 len;
> +	int err;
> +
> +	xdp = xsk_buff_alloc(pool);

same question as on tx side -anything stopped you from using batch API -
xsk_buff_alloc_batch() ?

> +	if (!xdp)
> +		return -ENOMEM;
> +
> +	/* use the part of XDP_PACKET_HEADROOM as the virtnet hdr space */
> +	addr = xsk_buff_xdp_get_dma(xdp) - vi->hdr_len;
> +	len = xsk_pool_get_rx_frame_size(pool) + vi->hdr_len;
> +
> +	sg_init_table(rq->sg, 1);
> +	sg_fill_dma(rq->sg, addr, len);
> +
> +	err = virtqueue_add_inbuf_premapped(rq->vq, rq->sg, 1, xdp, gfp);
> +	if (err)
> +		xsk_buff_free(xdp);
> +
> +	return err;
> +}
> +
>  static int virtnet_xsk_xmit_one(struct send_queue *sq,
>  				struct xsk_buff_pool *pool,
>  				struct xdp_desc *desc)
> diff --git a/drivers/net/virtio/xsk.h b/drivers/net/virtio/xsk.h
> index f90c28972d72..5549143ef118 100644
> --- a/drivers/net/virtio/xsk.h
> +++ b/drivers/net/virtio/xsk.h
> @@ -24,4 +24,6 @@ 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);
>  int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag);
> +int add_recvbuf_xsk(struct virtnet_info *vi, struct receive_queue *rq,
> +		    struct xsk_buff_pool *pool, gfp_t gfp);
>  #endif
> -- 
> 2.32.0.3.g01195cf9f
>