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Date: Tue, 5 Jan 2021 17:11:40 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: netdev@...r.kernel.org
Cc: dust.li@...ux.alibaba.com, tonylu@...ux.alibaba.com,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Björn Töpel <bjorn.topel@...el.com>,
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>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
KP Singh <kpsingh@...nel.org>,
virtualization@...ts.linux-foundation.org (open list:VIRTIO CORE AND
NET DRIVERS), linux-kernel@...r.kernel.org (open list),
bpf@...r.kernel.org (open list:XDP SOCKETS (AF_XDP))
Subject: [PATCH netdev 2/5] virtio-net: support XDP_TX 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.
This patch allows XDP_TX to run by lock when not enough queue.
Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
drivers/net/virtio_net.c | 42 ++++++++++++++++++++++++++++++++----------
1 file changed, 32 insertions(+), 10 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index f65eea6..f2349b8 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -194,6 +194,7 @@ struct virtnet_info {
/* # of XDP queue pairs currently used by the driver */
u16 xdp_queue_pairs;
+ bool xdp_enable;
/* I like... big packets and I cannot lie! */
bool big_packets;
@@ -481,14 +482,34 @@ static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
return 0;
}
-static struct send_queue *virtnet_xdp_sq(struct virtnet_info *vi)
+static struct send_queue *virtnet_get_xdp_sq(struct virtnet_info *vi)
{
unsigned int qp;
+ struct netdev_queue *txq;
+
+ if (vi->curr_queue_pairs > nr_cpu_ids) {
+ qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
+ } else {
+ qp = smp_processor_id() % vi->curr_queue_pairs;
+ txq = netdev_get_tx_queue(vi->dev, qp);
+ __netif_tx_lock(txq, raw_smp_processor_id());
+ }
- qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id();
return &vi->sq[qp];
}
+static void virtnet_put_xdp_sq(struct virtnet_info *vi)
+{
+ unsigned int qp;
+ struct netdev_queue *txq;
+
+ if (vi->curr_queue_pairs <= nr_cpu_ids) {
+ qp = smp_processor_id() % vi->curr_queue_pairs;
+ txq = netdev_get_tx_queue(vi->dev, qp);
+ __netif_tx_unlock(txq);
+ }
+}
+
static int virtnet_xdp_xmit(struct net_device *dev,
int n, struct xdp_frame **frames, u32 flags)
{
@@ -512,7 +533,7 @@ static int virtnet_xdp_xmit(struct net_device *dev,
if (!xdp_prog)
return -ENXIO;
- sq = virtnet_xdp_sq(vi);
+ sq = virtnet_get_xdp_sq(vi);
if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) {
ret = -EINVAL;
@@ -560,12 +581,13 @@ static int virtnet_xdp_xmit(struct net_device *dev,
sq->stats.kicks += kicks;
u64_stats_update_end(&sq->stats.syncp);
+ virtnet_put_xdp_sq(vi);
return ret;
}
static unsigned int virtnet_get_headroom(struct virtnet_info *vi)
{
- return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0;
+ return vi->xdp_enable ? VIRTIO_XDP_HEADROOM : 0;
}
/* We copy the packet for XDP in the following cases:
@@ -1457,12 +1479,13 @@ 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_get_xdp_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_put_xdp_sq(vi);
}
return received;
@@ -2415,10 +2438,7 @@ 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",
- curr_qp + xdp_qp, vi->max_queue_pairs);
- return -ENOMEM;
+ xdp_qp = 0;
}
old_prog = rtnl_dereference(vi->rq[0].xdp_prog);
@@ -2451,12 +2471,14 @@ static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog,
netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp);
vi->xdp_queue_pairs = xdp_qp;
+ vi->xdp_enable = false;
if (prog) {
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);
}
+ vi->xdp_enable = true;
}
for (i = 0; i < vi->max_queue_pairs; i++) {
@@ -2524,7 +2546,7 @@ 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_enable)
return -EBUSY;
if (features & NETIF_F_LRO)
--
1.8.3.1
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