Commit 638264dc authored by Toshiaki Makita's avatar Toshiaki Makita Committed by Daniel Borkmann
Browse files

veth: Support per queue XDP ring 



Move XDP and napi related fields from veth_priv to newly created veth_rq
structure.

When xdp_frames are enqueued from ndo_xdp_xmit and XDP_TX, rxq is
selected by current cpu.

When skbs are enqueued from the peer device, rxq is one to one mapping
of its peer txq. This way we have a restriction that the number of rxqs
must not less than the number of peer txqs, but leave the possibility to
achieve bulk skb xmit in the future because txq lock would make it
possible to remove rxq ptr_ring lock.

v3:
- Add extack messages.
- Fix array overrun in veth_xmit.

Signed-off-by: default avatarToshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent d1396004

drivers/net/veth.c

+188 −90
Original line number Diff line number Diff line
@@ -42,20 +42,24 @@ struct pcpu_vstats { 
	struct u64_stats_sync	syncp;

};



struct veth_priv {

struct veth_rq {

	struct napi_struct	xdp_napi;

	struct net_device	*dev;

	struct bpf_prog __rcu	*xdp_prog;

	struct bpf_prog		*_xdp_prog;

	struct net_device __rcu	*peer;

	atomic64_t		dropped;

	struct xdp_mem_info	xdp_mem;

	unsigned		requested_headroom;

	bool			rx_notify_masked;

	struct ptr_ring		xdp_ring;

	struct xdp_rxq_info	xdp_rxq;

};



struct veth_priv {

	struct net_device __rcu	*peer;

	atomic64_t		dropped;

	struct bpf_prog		*_xdp_prog;

	struct veth_rq		*rq;

	unsigned int		requested_headroom;

};



/*

 * ethtool interface

 */
@@ -144,19 +148,19 @@ static void veth_ptr_free(void *ptr) 
		kfree_skb(ptr);

}



static void __veth_xdp_flush(struct veth_priv *priv)

static void __veth_xdp_flush(struct veth_rq *rq)

{

	/* Write ptr_ring before reading rx_notify_masked */

	smp_mb();

	if (!priv->rx_notify_masked) {

		priv->rx_notify_masked = true;

		napi_schedule(&priv->xdp_napi);

	if (!rq->rx_notify_masked) {

		rq->rx_notify_masked = true;

		napi_schedule(&rq->xdp_napi);

	}

}



static int veth_xdp_rx(struct veth_priv *priv, struct sk_buff *skb)

static int veth_xdp_rx(struct veth_rq *rq, struct sk_buff *skb)

{

	if (unlikely(ptr_ring_produce(&priv->xdp_ring, skb))) {

	if (unlikely(ptr_ring_produce(&rq->xdp_ring, skb))) {

		dev_kfree_skb_any(skb);

		return NET_RX_DROP;

	}
@@ -164,21 +168,22 @@ static int veth_xdp_rx(struct veth_priv *priv, struct sk_buff *skb) 
	return NET_RX_SUCCESS;

}



static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb, bool xdp)

static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb,

			    struct veth_rq *rq, bool xdp)

{

	struct veth_priv *priv = netdev_priv(dev);



	return __dev_forward_skb(dev, skb) ?: xdp ?

		veth_xdp_rx(priv, skb) :

		veth_xdp_rx(rq, skb) :

		netif_rx(skb);

}



static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)

{

	struct veth_priv *rcv_priv, *priv = netdev_priv(dev);

	struct veth_rq *rq = NULL;

	struct net_device *rcv;

	int length = skb->len;

	bool rcv_xdp = false;

	int rxq;



	rcu_read_lock();

	rcv = rcu_dereference(priv->peer);
@@ -188,9 +193,15 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev) 
	}



	rcv_priv = netdev_priv(rcv);

	rcv_xdp = rcu_access_pointer(rcv_priv->xdp_prog);

	rxq = skb_get_queue_mapping(skb);

	if (rxq < rcv->real_num_rx_queues) {

		rq = &rcv_priv->rq[rxq];

		rcv_xdp = rcu_access_pointer(rq->xdp_prog);

		if (rcv_xdp)

			skb_record_rx_queue(skb, rxq);

	}



	if (likely(veth_forward_skb(rcv, skb, rcv_xdp) == NET_RX_SUCCESS)) {

	if (likely(veth_forward_skb(rcv, skb, rq, rcv_xdp) == NET_RX_SUCCESS)) {

		struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);



		u64_stats_update_begin(&stats->syncp);
@@ -203,7 +214,7 @@ drop: 
	}



	if (rcv_xdp)

		__veth_xdp_flush(rcv_priv);

		__veth_xdp_flush(rq);



	rcu_read_unlock();
@@ -278,12 +289,18 @@ static struct sk_buff *veth_build_skb(void *head, int headroom, int len, 
	return skb;

}



static int veth_select_rxq(struct net_device *dev)

{

	return smp_processor_id() % dev->real_num_rx_queues;

}



static int veth_xdp_xmit(struct net_device *dev, int n,

			 struct xdp_frame **frames, u32 flags)

{

	struct veth_priv *rcv_priv, *priv = netdev_priv(dev);

	struct net_device *rcv;

	unsigned int max_len;

	struct veth_rq *rq;

	int i, drops = 0;



	if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
@@ -294,30 +311,31 @@ static int veth_xdp_xmit(struct net_device *dev, int n, 
		return -ENXIO;



	rcv_priv = netdev_priv(rcv);

	rq = &rcv_priv->rq[veth_select_rxq(rcv)];

	/* Non-NULL xdp_prog ensures that xdp_ring is initialized on receive

	 * side. This means an XDP program is loaded on the peer and the peer

	 * device is up.

	 */

	if (!rcu_access_pointer(rcv_priv->xdp_prog))

	if (!rcu_access_pointer(rq->xdp_prog))

		return -ENXIO;



	max_len = rcv->mtu + rcv->hard_header_len + VLAN_HLEN;



	spin_lock(&rcv_priv->xdp_ring.producer_lock);

	spin_lock(&rq->xdp_ring.producer_lock);

	for (i = 0; i < n; i++) {

		struct xdp_frame *frame = frames[i];

		void *ptr = veth_xdp_to_ptr(frame);



		if (unlikely(frame->len > max_len ||

			     __ptr_ring_produce(&rcv_priv->xdp_ring, ptr))) {

			     __ptr_ring_produce(&rq->xdp_ring, ptr))) {

			xdp_return_frame_rx_napi(frame);

			drops++;

		}

	}

	spin_unlock(&rcv_priv->xdp_ring.producer_lock);

	spin_unlock(&rq->xdp_ring.producer_lock);



	if (flags & XDP_XMIT_FLUSH)

		__veth_xdp_flush(rcv_priv);

		__veth_xdp_flush(rq);



	return n - drops;

}
@@ -326,6 +344,7 @@ static void veth_xdp_flush(struct net_device *dev) 
{

	struct veth_priv *rcv_priv, *priv = netdev_priv(dev);

	struct net_device *rcv;

	struct veth_rq *rq;



	rcu_read_lock();

	rcv = rcu_dereference(priv->peer);
@@ -333,11 +352,12 @@ static void veth_xdp_flush(struct net_device *dev) 
		goto out;



	rcv_priv = netdev_priv(rcv);

	rq = &rcv_priv->rq[veth_select_rxq(rcv)];

	/* xdp_ring is initialized on receive side? */

	if (unlikely(!rcu_access_pointer(rcv_priv->xdp_prog)))

	if (unlikely(!rcu_access_pointer(rq->xdp_prog)))

		goto out;



	__veth_xdp_flush(rcv_priv);

	__veth_xdp_flush(rq);

out:

	rcu_read_unlock();

}
@@ -352,7 +372,7 @@ static int veth_xdp_tx(struct net_device *dev, struct xdp_buff *xdp) 
	return veth_xdp_xmit(dev, 1, &frame, 0);

}



static struct sk_buff *veth_xdp_rcv_one(struct veth_priv *priv,

static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq,

					struct xdp_frame *frame,

					unsigned int *xdp_xmit)

{
@@ -365,7 +385,7 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_priv *priv, 
	struct sk_buff *skb;



	rcu_read_lock();

	xdp_prog = rcu_dereference(priv->xdp_prog);

	xdp_prog = rcu_dereference(rq->xdp_prog);

	if (likely(xdp_prog)) {

		struct xdp_buff xdp;

		u32 act;
@@ -374,7 +394,7 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_priv *priv, 
		xdp.data = frame->data;

		xdp.data_end = frame->data + frame->len;

		xdp.data_meta = frame->data - frame->metasize;

		xdp.rxq = &priv->xdp_rxq;

		xdp.rxq = &rq->xdp_rxq;



		act = bpf_prog_run_xdp(xdp_prog, &xdp);
@@ -387,8 +407,8 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_priv *priv, 
			orig_frame = *frame;

			xdp.data_hard_start = head;

			xdp.rxq->mem = frame->mem;

			if (unlikely(veth_xdp_tx(priv->dev, &xdp) < 0)) {

				trace_xdp_exception(priv->dev, xdp_prog, act);

			if (unlikely(veth_xdp_tx(rq->dev, &xdp) < 0)) {

				trace_xdp_exception(rq->dev, xdp_prog, act);

				frame = &orig_frame;

				goto err_xdp;

			}
@@ -399,7 +419,7 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_priv *priv, 
			orig_frame = *frame;

			xdp.data_hard_start = head;

			xdp.rxq->mem = frame->mem;

			if (xdp_do_redirect(priv->dev, &xdp, xdp_prog)) {

			if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) {

				frame = &orig_frame;

				goto err_xdp;

			}
@@ -409,7 +429,7 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_priv *priv, 
		default:

			bpf_warn_invalid_xdp_action(act);

		case XDP_ABORTED:

			trace_xdp_exception(priv->dev, xdp_prog, act);

			trace_xdp_exception(rq->dev, xdp_prog, act);

		case XDP_DROP:

			goto err_xdp;

		}
@@ -424,7 +444,7 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_priv *priv, 
	}



	xdp_scrub_frame(frame);

	skb->protocol = eth_type_trans(skb, priv->dev);

	skb->protocol = eth_type_trans(skb, rq->dev);

err:

	return skb;

err_xdp:
@@ -434,8 +454,7 @@ xdp_xmit: 
	return NULL;

}



static struct sk_buff *veth_xdp_rcv_skb(struct veth_priv *priv,

					struct sk_buff *skb,

static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, struct sk_buff *skb,

					unsigned int *xdp_xmit)

{

	u32 pktlen, headroom, act, metalen;
@@ -445,7 +464,7 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_priv *priv, 
	struct xdp_buff xdp;



	rcu_read_lock();

	xdp_prog = rcu_dereference(priv->xdp_prog);

	xdp_prog = rcu_dereference(rq->xdp_prog);

	if (unlikely(!xdp_prog)) {

		rcu_read_unlock();

		goto out;
@@ -499,7 +518,7 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_priv *priv, 
	xdp.data = skb_mac_header(skb);

	xdp.data_end = xdp.data + pktlen;

	xdp.data_meta = xdp.data;

	xdp.rxq = &priv->xdp_rxq;

	xdp.rxq = &rq->xdp_rxq;

	orig_data = xdp.data;

	orig_data_end = xdp.data_end;
@@ -511,9 +530,9 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_priv *priv, 
	case XDP_TX:

		get_page(virt_to_page(xdp.data));

		consume_skb(skb);

		xdp.rxq->mem = priv->xdp_mem;

		if (unlikely(veth_xdp_tx(priv->dev, &xdp) < 0)) {

			trace_xdp_exception(priv->dev, xdp_prog, act);

		xdp.rxq->mem = rq->xdp_mem;

		if (unlikely(veth_xdp_tx(rq->dev, &xdp) < 0)) {

			trace_xdp_exception(rq->dev, xdp_prog, act);

			goto err_xdp;

		}

		*xdp_xmit |= VETH_XDP_TX;
@@ -522,8 +541,8 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_priv *priv, 
	case XDP_REDIRECT:

		get_page(virt_to_page(xdp.data));

		consume_skb(skb);

		xdp.rxq->mem = priv->xdp_mem;

		if (xdp_do_redirect(priv->dev, &xdp, xdp_prog))

		xdp.rxq->mem = rq->xdp_mem;

		if (xdp_do_redirect(rq->dev, &xdp, xdp_prog))

			goto err_xdp;

		*xdp_xmit |= VETH_XDP_REDIR;

		rcu_read_unlock();
@@ -531,7 +550,7 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_priv *priv, 
	default:

		bpf_warn_invalid_xdp_action(act);

	case XDP_ABORTED:

		trace_xdp_exception(priv->dev, xdp_prog, act);

		trace_xdp_exception(rq->dev, xdp_prog, act);

	case XDP_DROP:

		goto drop;

	}
@@ -547,7 +566,7 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_priv *priv, 
	off = xdp.data_end - orig_data_end;

	if (off != 0)

		__skb_put(skb, off);

	skb->protocol = eth_type_trans(skb, priv->dev);

	skb->protocol = eth_type_trans(skb, rq->dev);



	metalen = xdp.data - xdp.data_meta;

	if (metalen)
@@ -565,27 +584,26 @@ xdp_xmit: 
	return NULL;

}



static int veth_xdp_rcv(struct veth_priv *priv, int budget,

			unsigned int *xdp_xmit)

static int veth_xdp_rcv(struct veth_rq *rq, int budget, unsigned int *xdp_xmit)

{

	int i, done = 0;



	for (i = 0; i < budget; i++) {

		void *ptr = __ptr_ring_consume(&priv->xdp_ring);

		void *ptr = __ptr_ring_consume(&rq->xdp_ring);

		struct sk_buff *skb;



		if (!ptr)

			break;



		if (veth_is_xdp_frame(ptr)) {

			skb = veth_xdp_rcv_one(priv, veth_ptr_to_xdp(ptr),

			skb = veth_xdp_rcv_one(rq, veth_ptr_to_xdp(ptr),

					       xdp_xmit);

		} else {

			skb = veth_xdp_rcv_skb(priv, ptr, xdp_xmit);

			skb = veth_xdp_rcv_skb(rq, ptr, xdp_xmit);

		}



		if (skb)

			napi_gro_receive(&priv->xdp_napi, skb);

			napi_gro_receive(&rq->xdp_napi, skb);



		done++;

	}
@@ -595,25 +613,25 @@ static int veth_xdp_rcv(struct veth_priv *priv, int budget, 


static int veth_poll(struct napi_struct *napi, int budget)

{

	struct veth_priv *priv =

		container_of(napi, struct veth_priv, xdp_napi);

	struct veth_rq *rq =

		container_of(napi, struct veth_rq, xdp_napi);

	unsigned int xdp_xmit = 0;

	int done;



	xdp_set_return_frame_no_direct();

	done = veth_xdp_rcv(priv, budget, &xdp_xmit);

	done = veth_xdp_rcv(rq, budget, &xdp_xmit);



	if (done < budget && napi_complete_done(napi, done)) {

		/* Write rx_notify_masked before reading ptr_ring */

		smp_store_mb(priv->rx_notify_masked, false);

		if (unlikely(!__ptr_ring_empty(&priv->xdp_ring))) {

			priv->rx_notify_masked = true;

			napi_schedule(&priv->xdp_napi);

		smp_store_mb(rq->rx_notify_masked, false);

		if (unlikely(!__ptr_ring_empty(&rq->xdp_ring))) {

			rq->rx_notify_masked = true;

			napi_schedule(&rq->xdp_napi);

		}

	}



	if (xdp_xmit & VETH_XDP_TX)

		veth_xdp_flush(priv->dev);

		veth_xdp_flush(rq->dev);

	if (xdp_xmit & VETH_XDP_REDIR)

		xdp_do_flush_map();

	xdp_clear_return_frame_no_direct();
@@ -624,56 +642,90 @@ static int veth_poll(struct napi_struct *napi, int budget) 
static int veth_napi_add(struct net_device *dev)

{

	struct veth_priv *priv = netdev_priv(dev);

	int err;

	int err, i;



	for (i = 0; i < dev->real_num_rx_queues; i++) {

		struct veth_rq *rq = &priv->rq[i];



	err = ptr_ring_init(&priv->xdp_ring, VETH_RING_SIZE, GFP_KERNEL);

		err = ptr_ring_init(&rq->xdp_ring, VETH_RING_SIZE, GFP_KERNEL);

		if (err)

		return err;

			goto err_xdp_ring;

	}



	netif_napi_add(dev, &priv->xdp_napi, veth_poll, NAPI_POLL_WEIGHT);

	napi_enable(&priv->xdp_napi);

	for (i = 0; i < dev->real_num_rx_queues; i++) {

		struct veth_rq *rq = &priv->rq[i];



		netif_napi_add(dev, &rq->xdp_napi, veth_poll, NAPI_POLL_WEIGHT);

		napi_enable(&rq->xdp_napi);

	}



	return 0;

err_xdp_ring:

	for (i--; i >= 0; i--)

		ptr_ring_cleanup(&priv->rq[i].xdp_ring, veth_ptr_free);



	return err;

}



static void veth_napi_del(struct net_device *dev)

{

	struct veth_priv *priv = netdev_priv(dev);

	int i;



	napi_disable(&priv->xdp_napi);

	netif_napi_del(&priv->xdp_napi);

	priv->rx_notify_masked = false;

	ptr_ring_cleanup(&priv->xdp_ring, veth_ptr_free);

	for (i = 0; i < dev->real_num_rx_queues; i++) {

		struct veth_rq *rq = &priv->rq[i];



		napi_disable(&rq->xdp_napi);

		napi_hash_del(&rq->xdp_napi);

	}

	synchronize_net();



	for (i = 0; i < dev->real_num_rx_queues; i++) {

		struct veth_rq *rq = &priv->rq[i];



		netif_napi_del(&rq->xdp_napi);

		rq->rx_notify_masked = false;

		ptr_ring_cleanup(&rq->xdp_ring, veth_ptr_free);

	}

}



static int veth_enable_xdp(struct net_device *dev)

{

	struct veth_priv *priv = netdev_priv(dev);

	int err;

	int err, i;



	if (!xdp_rxq_info_is_reg(&priv->xdp_rxq)) {

		err = xdp_rxq_info_reg(&priv->xdp_rxq, dev, 0);

	if (!xdp_rxq_info_is_reg(&priv->rq[0].xdp_rxq)) {

		for (i = 0; i < dev->real_num_rx_queues; i++) {

			struct veth_rq *rq = &priv->rq[i];



			err = xdp_rxq_info_reg(&rq->xdp_rxq, dev, i);

			if (err < 0)

			return err;

				goto err_rxq_reg;



		err = xdp_rxq_info_reg_mem_model(&priv->xdp_rxq,

						 MEM_TYPE_PAGE_SHARED, NULL);

			err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq,

							 MEM_TYPE_PAGE_SHARED,

							 NULL);

			if (err < 0)

			goto err;

				goto err_reg_mem;



			/* Save original mem info as it can be overwritten */

			rq->xdp_mem = rq->xdp_rxq.mem;

		}



		err = veth_napi_add(dev);

		if (err)

			goto err;



		/* Save original mem info as it can be overwritten */

		priv->xdp_mem = priv->xdp_rxq.mem;

			goto err_rxq_reg;

	}



	rcu_assign_pointer(priv->xdp_prog, priv->_xdp_prog);

	for (i = 0; i < dev->real_num_rx_queues; i++)

		rcu_assign_pointer(priv->rq[i].xdp_prog, priv->_xdp_prog);



	return 0;

err:

	xdp_rxq_info_unreg(&priv->xdp_rxq);

err_reg_mem:

	xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq);

err_rxq_reg:

	for (i--; i >= 0; i--)

		xdp_rxq_info_unreg(&priv->rq[i].xdp_rxq);



	return err;

}
@@ -681,11 +733,17 @@ err: 
static void veth_disable_xdp(struct net_device *dev)

{

	struct veth_priv *priv = netdev_priv(dev);

	int i;



	rcu_assign_pointer(priv->xdp_prog, NULL);

	for (i = 0; i < dev->real_num_rx_queues; i++)

		rcu_assign_pointer(priv->rq[i].xdp_prog, NULL);

	veth_napi_del(dev);

	priv->xdp_rxq.mem = priv->xdp_mem;

	xdp_rxq_info_unreg(&priv->xdp_rxq);

	for (i = 0; i < dev->real_num_rx_queues; i++) {

		struct veth_rq *rq = &priv->rq[i];



		rq->xdp_rxq.mem = rq->xdp_mem;

		xdp_rxq_info_unreg(&rq->xdp_rxq);

	}

}



static int veth_open(struct net_device *dev)
@@ -842,6 +900,12 @@ static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog, 
			goto err;

		}



		if (dev->real_num_rx_queues < peer->real_num_tx_queues) {

			NL_SET_ERR_MSG_MOD(extack, "XDP expects number of rx queues not less than peer tx queues");

			err = -ENOSPC;

			goto err;

		}



		if (dev->flags & IFF_UP) {

			err = veth_enable_xdp(dev);

			if (err) {
@@ -976,13 +1040,31 @@ static int veth_validate(struct nlattr *tb[], struct nlattr *data[], 
	return 0;

}



static int veth_alloc_queues(struct net_device *dev)

{

	struct veth_priv *priv = netdev_priv(dev);



	priv->rq = kcalloc(dev->num_rx_queues, sizeof(*priv->rq), GFP_KERNEL);

	if (!priv->rq)

		return -ENOMEM;



	return 0;

}



static void veth_free_queues(struct net_device *dev)

{

	struct veth_priv *priv = netdev_priv(dev);



	kfree(priv->rq);

}



static struct rtnl_link_ops veth_link_ops;



static int veth_newlink(struct net *src_net, struct net_device *dev,

			struct nlattr *tb[], struct nlattr *data[],

			struct netlink_ext_ack *extack)

{

	int err;

	int err, i;

	struct net_device *peer;

	struct veth_priv *priv;

	char ifname[IFNAMSIZ];
@@ -1035,6 +1117,12 @@ static int veth_newlink(struct net *src_net, struct net_device *dev, 
		return PTR_ERR(peer);

	}



	err = veth_alloc_queues(peer);

	if (err) {

		put_net(net);

		goto err_peer_alloc_queues;

	}



	if (!ifmp || !tbp[IFLA_ADDRESS])

		eth_hw_addr_random(peer);
@@ -1063,6 +1151,10 @@ static int veth_newlink(struct net *src_net, struct net_device *dev, 
	 * should be re-allocated

	 */



	err = veth_alloc_queues(dev);

	if (err)

		goto err_alloc_queues;



	if (tb[IFLA_ADDRESS] == NULL)

		eth_hw_addr_random(dev);
@@ -1082,22 +1174,28 @@ static int veth_newlink(struct net *src_net, struct net_device *dev, 
	 */



	priv = netdev_priv(dev);

	priv->dev = dev;

	for (i = 0; i < dev->real_num_rx_queues; i++)

		priv->rq[i].dev = dev;

	rcu_assign_pointer(priv->peer, peer);



	priv = netdev_priv(peer);

	priv->dev = peer;

	for (i = 0; i < peer->real_num_rx_queues; i++)

		priv->rq[i].dev = peer;

	rcu_assign_pointer(priv->peer, dev);



	return 0;



err_register_dev:

	veth_free_queues(dev);

err_alloc_queues:

	/* nothing to do */

err_configure_peer:

	unregister_netdevice(peer);

	return err;



err_register_peer:

	veth_free_queues(peer);

err_peer_alloc_queues:

	free_netdev(peer);

	return err;

}

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