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author | 2018-01-03 11:26:04 +0100 | |
---|---|---|
committer | 2018-01-05 15:21:22 -0800 | |
commit | 754b8a21a96d5f11712245aef907149606b323ae (patch) | |
tree | 4ea45255e1e1672cd16f45916af47de47a237a06 | |
parent | tun: setup xdp_rxq_info (diff) | |
download | linux-754b8a21a96d.tar.gz linux-754b8a21a96d.tar.bz2 linux-754b8a21a96d.zip |
virtio_net: setup xdp_rxq_info
The virtio_net driver doesn't dynamically change the RX-ring queue
layout and backing pages, but instead reject XDP setup if all the
conditions for XDP is not meet. Thus, the xdp_rxq_info also remains
fairly static. This allow us to simply add the reg/unreg to
net_device open/close functions.
Driver hook points for xdp_rxq_info:
* reg : virtnet_open
* unreg: virtnet_close
V3:
- bugfix, also setup xdp.rxq in receive_mergeable()
- Tested bpf-sample prog inside guest on a virtio_net device
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
-rw-r--r-- | drivers/net/virtio_net.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 6fb7b658a6cc..ed8299343728 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -31,6 +31,7 @@ #include <linux/average.h> #include <linux/filter.h> #include <net/route.h> +#include <net/xdp.h> static int napi_weight = NAPI_POLL_WEIGHT; module_param(napi_weight, int, 0444); @@ -115,6 +116,8 @@ struct receive_queue { /* Name of this receive queue: input.$index */ char name[40]; + + struct xdp_rxq_info xdp_rxq; }; struct virtnet_info { @@ -559,6 +562,7 @@ static struct sk_buff *receive_small(struct net_device *dev, xdp.data = xdp.data_hard_start + xdp_headroom; xdp_set_data_meta_invalid(&xdp); xdp.data_end = xdp.data + len; + xdp.rxq = &rq->xdp_rxq; orig_data = xdp.data; act = bpf_prog_run_xdp(xdp_prog, &xdp); @@ -692,6 +696,8 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, xdp.data = data + vi->hdr_len; xdp_set_data_meta_invalid(&xdp); xdp.data_end = xdp.data + (len - vi->hdr_len); + xdp.rxq = &rq->xdp_rxq; + act = bpf_prog_run_xdp(xdp_prog, &xdp); if (act != XDP_PASS) @@ -1225,13 +1231,18 @@ static int virtnet_poll(struct napi_struct *napi, int budget) static int virtnet_open(struct net_device *dev) { struct virtnet_info *vi = netdev_priv(dev); - int i; + int i, err; for (i = 0; i < vi->max_queue_pairs; i++) { if (i < vi->curr_queue_pairs) /* Make sure we have some buffers: if oom use wq. */ if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) schedule_delayed_work(&vi->refill, 0); + + err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i); + if (err < 0) + return err; + virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); } @@ -1560,6 +1571,7 @@ static int virtnet_close(struct net_device *dev) cancel_delayed_work_sync(&vi->refill); for (i = 0; i < vi->max_queue_pairs; i++) { + xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); napi_disable(&vi->rq[i].napi); virtnet_napi_tx_disable(&vi->sq[i].napi); } |