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Message-ID: <1718246630.9367933-4-xuanzhuo@linux.alibaba.com>
Date: Thu, 13 Jun 2024 10:43:50 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: netdev@...r.kernel.org,
Jason Wang <jasowang@...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 v4 09/15] virtio_net: xsk: bind/unbind xsk
On Wed, 12 Jun 2024 19:43:01 -0400, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> On Tue, Jun 11, 2024 at 07:41:41PM +0800, Xuan Zhuo wrote:
> > This patch implement the logic of bind/unbind xsk pool to sq and rq.
> >
> > Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
>
> I'd just squash with previous patch. This one is hard to review in
> isolation.
Why?
The previous patch is to supply a API to switch to premapped mode for sq.
This is to introduce the xsk. This patch just use the API.
I do not think we should merge these two patch.
Thanks.
>
> > ---
> > drivers/net/virtio_net.c | 199 +++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 199 insertions(+)
> >
> > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> > index 4968ab7eb5a4..c82a0691632c 100644
> > --- a/drivers/net/virtio_net.c
> > +++ b/drivers/net/virtio_net.c
> > @@ -26,6 +26,7 @@
> > #include <net/netdev_rx_queue.h>
> > #include <net/netdev_queues.h>
> > #include <uapi/linux/virtio_ring.h>
> > +#include <net/xdp_sock_drv.h>
> >
> > static int napi_weight = NAPI_POLL_WEIGHT;
> > module_param(napi_weight, int, 0444);
> > @@ -57,6 +58,8 @@ DECLARE_EWMA(pkt_len, 0, 64)
> >
> > #define VIRTNET_DRIVER_VERSION "1.0.0"
> >
> > +static struct virtio_net_hdr_mrg_rxbuf xsk_hdr;
> > +
> > static const unsigned long guest_offloads[] = {
> > VIRTIO_NET_F_GUEST_TSO4,
> > VIRTIO_NET_F_GUEST_TSO6,
> > @@ -320,6 +323,12 @@ struct send_queue {
> > bool premapped;
> >
> > struct virtnet_sq_dma_info dmainfo;
> > +
> > + struct {
> > + struct xsk_buff_pool *pool;
> > +
> > + dma_addr_t hdr_dma_address;
> > + } xsk;
> > };
> >
> > /* Internal representation of a receive virtqueue */
> > @@ -371,6 +380,13 @@ struct receive_queue {
> >
> > /* Record the last dma info to free after new pages is allocated. */
> > struct virtnet_rq_dma *last_dma;
> > +
> > + struct {
> > + struct xsk_buff_pool *pool;
> > +
> > + /* xdp rxq used by xsk */
> > + struct xdp_rxq_info xdp_rxq;
> > + } xsk;
> > };
> >
> > /* This structure can contain rss message with maximum settings for indirection table and keysize
> > @@ -5168,6 +5184,187 @@ static int virtnet_restore_guest_offloads(struct virtnet_info *vi)
> > return virtnet_set_guest_offloads(vi, offloads);
> > }
> >
> > +static int virtnet_rq_bind_xsk_pool(struct virtnet_info *vi, struct receive_queue *rq,
> > + struct xsk_buff_pool *pool)
> > +{
> > + int err, qindex;
> > +
> > + qindex = rq - vi->rq;
> > +
> > + if (pool) {
> > + err = xdp_rxq_info_reg(&rq->xsk.xdp_rxq, vi->dev, qindex, rq->napi.napi_id);
> > + if (err < 0)
> > + return err;
> > +
> > + err = xdp_rxq_info_reg_mem_model(&rq->xsk.xdp_rxq,
> > + MEM_TYPE_XSK_BUFF_POOL, NULL);
> > + if (err < 0) {
> > + xdp_rxq_info_unreg(&rq->xsk.xdp_rxq);
> > + return err;
> > + }
> > +
> > + xsk_pool_set_rxq_info(pool, &rq->xsk.xdp_rxq);
> > + }
> > +
> > + virtnet_rx_pause(vi, rq);
> > +
> > + err = virtqueue_reset(rq->vq, virtnet_rq_unmap_free_buf);
> > + if (err) {
> > + netdev_err(vi->dev, "reset rx fail: rx queue index: %d err: %d\n", qindex, err);
> > +
> > + pool = NULL;
> > + }
> > +
> > + if (!pool)
> > + xdp_rxq_info_unreg(&rq->xsk.xdp_rxq);
> > +
> > + rq->xsk.pool = pool;
> > +
> > + virtnet_rx_resume(vi, rq);
> > +
> > + return err;
> > +}
> > +
> > +static int virtnet_sq_bind_xsk_pool(struct virtnet_info *vi,
> > + struct send_queue *sq,
> > + struct xsk_buff_pool *pool)
> > +{
> > + int err, qindex;
> > +
> > + qindex = sq - vi->sq;
> > +
> > + virtnet_tx_pause(vi, sq);
> > +
> > + err = virtqueue_reset(sq->vq, virtnet_sq_free_unused_buf);
> > + if (err)
> > + netdev_err(vi->dev, "reset tx fail: tx queue index: %d err: %d\n", qindex, err);
> > + else
> > + err = virtnet_sq_set_premapped(sq, !!pool);
> > +
> > + if (err)
> > + pool = NULL;
> > +
> > + sq->xsk.pool = pool;
> > +
> > + virtnet_tx_resume(vi, sq);
> > +
> > + return err;
> > +}
> > +
> > +static int virtnet_xsk_pool_enable(struct net_device *dev,
> > + struct xsk_buff_pool *pool,
> > + u16 qid)
> > +{
> > + struct virtnet_info *vi = netdev_priv(dev);
> > + struct receive_queue *rq;
> > + struct send_queue *sq;
> > + struct device *dma_dev;
> > + dma_addr_t hdr_dma;
> > + int err;
> > +
> > + /* In big_packets mode, xdp cannot work, so there is no need to
> > + * initialize xsk of rq.
> > + *
> > + * Support for small mode firstly.
> > + */
> > + if (vi->big_packets)
> > + return -ENOENT;
> > +
> > + if (qid >= vi->curr_queue_pairs)
> > + return -EINVAL;
> > +
> > + sq = &vi->sq[qid];
> > + rq = &vi->rq[qid];
> > +
> > + /* xsk tx zerocopy depend on the tx napi.
> > + *
> > + * All xsk packets are actually consumed and sent out from the xsk tx
> > + * queue under the tx napi mechanism.
> > + */
> > + if (!sq->napi.weight)
> > + return -EPERM;
> > +
> > + /* For the xsk, the tx and rx should have the same device. But
> > + * vq->dma_dev allows every vq has the respective dma dev. So I check
> > + * the dma dev of vq and sq is the same dev.
> > + */
> > + if (virtqueue_dma_dev(rq->vq) != virtqueue_dma_dev(sq->vq))
> > + return -EPERM;
> > +
> > + dma_dev = virtqueue_dma_dev(rq->vq);
> > + if (!dma_dev)
> > + return -EPERM;
> > +
> > + hdr_dma = dma_map_single(dma_dev, &xsk_hdr, vi->hdr_len, DMA_TO_DEVICE);
> > + if (dma_mapping_error(dma_dev, hdr_dma))
> > + return -ENOMEM;
> > +
> > + err = xsk_pool_dma_map(pool, dma_dev, 0);
> > + if (err)
> > + goto err_xsk_map;
> > +
> > + err = virtnet_rq_bind_xsk_pool(vi, rq, pool);
> > + if (err)
> > + goto err_rq;
> > +
> > + err = virtnet_sq_bind_xsk_pool(vi, sq, pool);
> > + if (err)
> > + goto err_sq;
> > +
> > + /* Now, we do not support tx offset, so all the tx virtnet hdr is zero.
> > + * So all the tx packets can share a single hdr.
> > + */
> > + sq->xsk.hdr_dma_address = hdr_dma;
> > +
> > + return 0;
> > +
> > +err_sq:
> > + virtnet_rq_bind_xsk_pool(vi, rq, NULL);
> > +err_rq:
> > + xsk_pool_dma_unmap(pool, 0);
> > +err_xsk_map:
> > + dma_unmap_single(dma_dev, hdr_dma, vi->hdr_len, DMA_TO_DEVICE);
> > + return err;
> > +}
> > +
> > +static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid)
> > +{
> > + struct virtnet_info *vi = netdev_priv(dev);
> > + struct xsk_buff_pool *pool;
> > + struct device *dma_dev;
> > + struct receive_queue *rq;
> > + struct send_queue *sq;
> > + int err1, err2;
> > +
> > + if (qid >= vi->curr_queue_pairs)
> > + return -EINVAL;
> > +
> > + sq = &vi->sq[qid];
> > + rq = &vi->rq[qid];
> > +
> > + pool = sq->xsk.pool;
> > +
> > + err1 = virtnet_sq_bind_xsk_pool(vi, sq, NULL);
> > + err2 = virtnet_rq_bind_xsk_pool(vi, rq, NULL);
> > +
> > + xsk_pool_dma_unmap(pool, 0);
> > +
> > + dma_dev = virtqueue_dma_dev(rq->vq);
> > +
> > + dma_unmap_single(dma_dev, sq->xsk.hdr_dma_address, vi->hdr_len, DMA_TO_DEVICE);
> > +
> > + return err1 | err2;
> > +}
> > +
> > +static int virtnet_xsk_pool_setup(struct net_device *dev, struct netdev_bpf *xdp)
> > +{
> > + if (xdp->xsk.pool)
> > + return virtnet_xsk_pool_enable(dev, xdp->xsk.pool,
> > + xdp->xsk.queue_id);
> > + else
> > + return virtnet_xsk_pool_disable(dev, xdp->xsk.queue_id);
> > +}
> > +
> > static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
> > struct netlink_ext_ack *extack)
> > {
> > @@ -5293,6 +5490,8 @@ static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp)
> > switch (xdp->command) {
> > case XDP_SETUP_PROG:
> > return virtnet_xdp_set(dev, xdp->prog, xdp->extack);
> > + case XDP_SETUP_XSK_POOL:
> > + return virtnet_xsk_pool_setup(dev, xdp);
> > default:
> > return -EINVAL;
> > }
> > --
> > 2.32.0.3.g01195cf9f
>
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