On Fri, 20 Oct 2023 14:56:51 +0800, Jason Wang <jasowang@xxxxxxxxxx> wrote: > On Mon, Oct 16, 2023 at 8:01 PM Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> wrote: > > > > Implement the logic of filling vq with XSK buffer. > > > > Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> > > --- > > drivers/net/virtio/main.c | 13 +++++++ > > drivers/net/virtio/virtio_net.h | 5 +++ > > drivers/net/virtio/xsk.c | 66 ++++++++++++++++++++++++++++++++- > > drivers/net/virtio/xsk.h | 2 + > > 4 files changed, 85 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/net/virtio/main.c b/drivers/net/virtio/main.c > > index 58bb38f9b453..0e740447b142 100644 > > --- a/drivers/net/virtio/main.c > > +++ b/drivers/net/virtio/main.c > > @@ -1787,9 +1787,20 @@ static int add_recvbuf_mergeable(struct virtnet_info *vi, > > static bool try_fill_recv(struct virtnet_info *vi, struct virtnet_rq *rq, > > gfp_t gfp) > > { > > + struct xsk_buff_pool *pool; > > int err; > > bool oom; > > > > + rcu_read_lock(); > > A question here: should we sync with refill work during rx_pause? > > > + pool = rcu_dereference(rq->xsk.pool); > > + if (pool) { > > + err = virtnet_add_recvbuf_xsk(vi, rq, pool, gfp); > > + oom = err == -ENOMEM; > > + rcu_read_unlock(); > > + goto kick; > > + } > > + rcu_read_unlock(); > > And if we synchronize with that there's probably no need for the rcu > and we can merge the logic with the following ones? YES. we synchronize the rx_pause and this. But for the rcu object, I think we should use rcu_xxx() API. Thanks. > > Thanks > > > > + > > do { > > if (vi->mergeable_rx_bufs) > > err = add_recvbuf_mergeable(vi, rq, gfp); > > @@ -1802,6 +1813,8 @@ static bool try_fill_recv(struct virtnet_info *vi, struct virtnet_rq *rq, > > if (err) > > break; > > } while (rq->vq->num_free); > > + > > +kick: > > if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { > > unsigned long flags; > > > > diff --git a/drivers/net/virtio/virtio_net.h b/drivers/net/virtio/virtio_net.h > > index d4e620a084f4..6e71622fca45 100644 > > --- a/drivers/net/virtio/virtio_net.h > > +++ b/drivers/net/virtio/virtio_net.h > > @@ -156,6 +156,11 @@ struct virtnet_rq { > > > > /* xdp rxq used by xsk */ > > struct xdp_rxq_info xdp_rxq; > > + > > + struct xdp_buff **xsk_buffs; > > + u32 nxt_idx; > > + u32 num; > > + u32 size; > > } xsk; > > }; > > > > diff --git a/drivers/net/virtio/xsk.c b/drivers/net/virtio/xsk.c > > index 973e783260c3..841fb078882a 100644 > > --- a/drivers/net/virtio/xsk.c > > +++ b/drivers/net/virtio/xsk.c > > @@ -37,6 +37,58 @@ static void virtnet_xsk_check_queue(struct virtnet_sq *sq) > > netif_stop_subqueue(dev, qnum); > > } > > > > +static int virtnet_add_recvbuf_batch(struct virtnet_info *vi, struct virtnet_rq *rq, > > + struct xsk_buff_pool *pool, gfp_t gfp) > > +{ > > + struct xdp_buff **xsk_buffs; > > + dma_addr_t addr; > > + u32 len, i; > > + int err = 0; > > + > > + xsk_buffs = rq->xsk.xsk_buffs; > > + > > + if (rq->xsk.nxt_idx >= rq->xsk.num) { > > + rq->xsk.num = xsk_buff_alloc_batch(pool, xsk_buffs, rq->xsk.size); > > + if (!rq->xsk.num) > > + return -ENOMEM; > > + rq->xsk.nxt_idx = 0; > > + } > > + > > + while (rq->xsk.nxt_idx < rq->xsk.num) { > > + i = rq->xsk.nxt_idx; > > + > > + /* use the part of XDP_PACKET_HEADROOM as the virtnet hdr space */ > > + addr = xsk_buff_xdp_get_dma(xsk_buffs[i]) - 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(rq->vq, rq->sg, 1, xsk_buffs[i], gfp); > > + if (err) > > + return err; > > + > > + rq->xsk.nxt_idx++; > > + } > > + > > + return 0; > > +} > > + > > +int virtnet_add_recvbuf_xsk(struct virtnet_info *vi, struct virtnet_rq *rq, > > + struct xsk_buff_pool *pool, gfp_t gfp) > > +{ > > + int err; > > + > > + do { > > + err = virtnet_add_recvbuf_batch(vi, rq, pool, gfp); > > + if (err) > > + return err; > > + > > + } while (rq->vq->num_free); > > + > > + return 0; > > +} > > + > > static int virtnet_xsk_xmit_one(struct virtnet_sq *sq, > > struct xsk_buff_pool *pool, > > struct xdp_desc *desc) > > @@ -244,7 +296,7 @@ static int virtnet_xsk_pool_enable(struct net_device *dev, > > struct virtnet_sq *sq; > > struct device *dma_dev; > > dma_addr_t hdr_dma; > > - int err; > > + int err, size; > > > > /* In big_packets mode, xdp cannot work, so there is no need to > > * initialize xsk of rq. > > @@ -276,6 +328,16 @@ static int virtnet_xsk_pool_enable(struct net_device *dev, > > if (!dma_dev) > > return -EPERM; > > > > + size = virtqueue_get_vring_size(rq->vq); > > + > > + rq->xsk.xsk_buffs = kcalloc(size, sizeof(*rq->xsk.xsk_buffs), GFP_KERNEL); > > + if (!rq->xsk.xsk_buffs) > > + return -ENOMEM; > > + > > + rq->xsk.size = size; > > + rq->xsk.nxt_idx = 0; > > + rq->xsk.num = 0; > > + > > 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; > > @@ -338,6 +400,8 @@ static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid) > > err1 = virtnet_sq_bind_xsk_pool(vi, sq, NULL); > > err2 = virtnet_rq_bind_xsk_pool(vi, rq, NULL); > > > > + kfree(rq->xsk.xsk_buffs); > > + > > return err1 | err2; > > } > > > > diff --git a/drivers/net/virtio/xsk.h b/drivers/net/virtio/xsk.h > > index 7ebc9bda7aee..bef41a3f954e 100644 > > --- a/drivers/net/virtio/xsk.h > > +++ b/drivers/net/virtio/xsk.h > > @@ -23,4 +23,6 @@ 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); > > int virtnet_xsk_wakeup(struct net_device *dev, u32 qid, u32 flag); > > +int virtnet_add_recvbuf_xsk(struct virtnet_info *vi, struct virtnet_rq *rq, > > + struct xsk_buff_pool *pool, gfp_t gfp); > > #endif > > -- > > 2.32.0.3.g01195cf9f > > > _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization