From 97c2c69e1926260c78c7f1c0b2c987934f1dc7a1 Mon Sep 17 00:00:00 2001 From: Xuan Zhuo Date: Wed, 10 Mar 2021 10:24:45 +0800 Subject: virtio-net: support XDP when not more queues The number of queues implemented by many virtio backends is limited, especially some machines have a large number of CPUs. In this case, it is often impossible to allocate a separate queue for XDP_TX/XDP_REDIRECT, then xdp cannot be loaded to work, even xdp does not use the XDP_TX/XDP_REDIRECT. This patch allows XDP_TX/XDP_REDIRECT to run by reuse the existing SQ with __netif_tx_lock() hold when there are not enough queues. Signed-off-by: Xuan Zhuo Reviewed-by: Dust Li Acked-by: Jason Wang Signed-off-by: David S. Miller --- drivers/net/virtio_net.c | 62 ++++++++++++++++++++++++++++++++++++++---------- 1 file changed, 49 insertions(+), 13 deletions(-) (limited to 'drivers/net/virtio_net.c') diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 708a8b2ca25b..e97288dd6e5a 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -195,6 +195,9 @@ struct virtnet_info { /* # of XDP queue pairs currently used by the driver */ u16 xdp_queue_pairs; + /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */ + bool xdp_enabled; + /* I like... big packets and I cannot lie! */ bool big_packets; @@ -481,12 +484,41 @@ static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, return 0; } -static struct send_queue *virtnet_xdp_sq(struct virtnet_info *vi) -{ - unsigned int qp; - - qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id(); - return &vi->sq[qp]; +/* when vi->curr_queue_pairs > nr_cpu_ids, the txq/sq is only used for xdp tx on + * the current cpu, so it does not need to be locked. + * + * Here we use marco instead of inline functions because we have to deal with + * three issues at the same time: 1. the choice of sq. 2. judge and execute the + * lock/unlock of txq 3. make sparse happy. It is difficult for two inline + * functions to perfectly solve these three problems at the same time. + */ +#define virtnet_xdp_get_sq(vi) ({ \ + struct netdev_queue *txq; \ + typeof(vi) v = (vi); \ + unsigned int qp; \ + \ + if (v->curr_queue_pairs > nr_cpu_ids) { \ + qp = v->curr_queue_pairs - v->xdp_queue_pairs; \ + qp += smp_processor_id(); \ + txq = netdev_get_tx_queue(v->dev, qp); \ + __netif_tx_acquire(txq); \ + } else { \ + qp = smp_processor_id() % v->curr_queue_pairs; \ + txq = netdev_get_tx_queue(v->dev, qp); \ + __netif_tx_lock(txq, raw_smp_processor_id()); \ + } \ + v->sq + qp; \ +}) + +#define virtnet_xdp_put_sq(vi, q) { \ + struct netdev_queue *txq; \ + typeof(vi) v = (vi); \ + \ + txq = netdev_get_tx_queue(v->dev, (q) - v->sq); \ + if (v->curr_queue_pairs > nr_cpu_ids) \ + __netif_tx_release(txq); \ + else \ + __netif_tx_unlock(txq); \ } static int virtnet_xdp_xmit(struct net_device *dev, @@ -512,7 +544,7 @@ static int virtnet_xdp_xmit(struct net_device *dev, if (!xdp_prog) return -ENXIO; - sq = virtnet_xdp_sq(vi); + sq = virtnet_xdp_get_sq(vi); if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { ret = -EINVAL; @@ -560,12 +592,13 @@ out: sq->stats.kicks += kicks; u64_stats_update_end(&sq->stats.syncp); + virtnet_xdp_put_sq(vi, sq); return ret; } static unsigned int virtnet_get_headroom(struct virtnet_info *vi) { - return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0; + return vi->xdp_enabled ? VIRTIO_XDP_HEADROOM : 0; } /* We copy the packet for XDP in the following cases: @@ -1458,12 +1491,13 @@ static int virtnet_poll(struct napi_struct *napi, int budget) xdp_do_flush(); if (xdp_xmit & VIRTIO_XDP_TX) { - sq = virtnet_xdp_sq(vi); + sq = virtnet_xdp_get_sq(vi); if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { u64_stats_update_begin(&sq->stats.syncp); sq->stats.kicks++; u64_stats_update_end(&sq->stats.syncp); } + virtnet_xdp_put_sq(vi, sq); } return received; @@ -2418,10 +2452,9 @@ static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, /* XDP requires extra queues for XDP_TX */ if (curr_qp + xdp_qp > vi->max_queue_pairs) { - NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available"); - netdev_warn(dev, "request %i queues but max is %i\n", + netdev_warn(dev, "XDP request %i queues but max is %i. XDP_TX and XDP_REDIRECT will operate in a slower locked tx mode.\n", curr_qp + xdp_qp, vi->max_queue_pairs); - return -ENOMEM; + xdp_qp = 0; } old_prog = rtnl_dereference(vi->rq[0].xdp_prog); @@ -2455,11 +2488,14 @@ static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, vi->xdp_queue_pairs = xdp_qp; if (prog) { + vi->xdp_enabled = true; for (i = 0; i < vi->max_queue_pairs; i++) { rcu_assign_pointer(vi->rq[i].xdp_prog, prog); if (i == 0 && !old_prog) virtnet_clear_guest_offloads(vi); } + } else { + vi->xdp_enabled = false; } for (i = 0; i < vi->max_queue_pairs; i++) { @@ -2527,7 +2563,7 @@ static int virtnet_set_features(struct net_device *dev, int err; if ((dev->features ^ features) & NETIF_F_LRO) { - if (vi->xdp_queue_pairs) + if (vi->xdp_enabled) return -EBUSY; if (features & NETIF_F_LRO) -- cgit