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authorDavid Ahern <dsa@cumulusnetworks.com>2017-03-20 11:19:44 -0700
committerDavid S. Miller <davem@davemloft.net>2017-03-22 11:19:48 -0700
commitdcdd43c41e60d7618ad54369d77ee39f122d41e4 (patch)
tree308591971465a1f8320a1a8e093e4e6e32406a51 /drivers
parenta2d133b1d465016d0d97560b11f54ba0ace56d3e (diff)
net: vrf: performance improvements for IPv4
The VRF driver allows users to implement device based features for an entire domain. For example, a qdisc or netfilter rules can be attached to a VRF device or tcpdump can be used to view packets for all devices in the L3 domain. The device-based features come with a performance penalty, most notably in the Tx path. The VRF driver uses the l3mdev_l3_out hook to switch the dst on an skb to its private dst. This allows the skb to traverse the xmit stack with the device set to the VRF device which in turn enables the netfilter and qdisc features. The VRF driver then performs the FIB lookup again and reinserts the packet. This patch avoids the redirect for IPv4 packets if a qdisc has not been attached to a VRF device which is the default config. In this case the netfilter hooks and network taps are directly traversed in the l3mdev_l3_out handler. If a qdisc is attached to a VRF device, then the redirect using the vrf dst is done. Additional overhead is removed by only checking packet taps if a socket is open on the device (vrf_dev->ptype_all list is not empty). Packet sockets bound to any device will still get a copy of the packet via the real ingress or egress interface. The end result of this change is a decrease in the overhead of VRF for the default, baseline case (ie., no netfilter rules, no packet sockets, no qdisc) to ~3% for UDP which has a lookup per packet and < 1% overhead for connected sockets that leverage early demux and avoid FIB lookups. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/vrf.c106
1 files changed, 96 insertions, 10 deletions
diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 7f28021d9d93..cdf7253ae89e 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -104,6 +104,23 @@ static void vrf_get_stats64(struct net_device *dev,
}
}
+/* by default VRF devices do not have a qdisc and are expected
+ * to be created with only a single queue.
+ */
+static bool qdisc_tx_is_default(const struct net_device *dev)
+{
+ struct netdev_queue *txq;
+ struct Qdisc *qdisc;
+
+ if (dev->num_tx_queues > 1)
+ return false;
+
+ txq = netdev_get_tx_queue(dev, 0);
+ qdisc = rcu_access_pointer(txq->qdisc);
+
+ return !qdisc->enqueue;
+}
+
/* Local traffic destined to local address. Reinsert the packet to rx
* path, similar to loopback handling.
*/
@@ -357,6 +374,29 @@ static netdev_tx_t vrf_xmit(struct sk_buff *skb, struct net_device *dev)
return ret;
}
+static int vrf_finish_direct(struct net *net, struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct net_device *vrf_dev = skb->dev;
+
+ if (!list_empty(&vrf_dev->ptype_all) &&
+ likely(skb_headroom(skb) >= ETH_HLEN)) {
+ struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);
+
+ ether_addr_copy(eth->h_source, vrf_dev->dev_addr);
+ eth_zero_addr(eth->h_dest);
+ eth->h_proto = skb->protocol;
+
+ rcu_read_lock_bh();
+ dev_queue_xmit_nit(skb, vrf_dev);
+ rcu_read_unlock_bh();
+
+ skb_pull(skb, ETH_HLEN);
+ }
+
+ return 1;
+}
+
#if IS_ENABLED(CONFIG_IPV6)
/* modelled after ip6_finish_output2 */
static int vrf_finish_output6(struct net *net, struct sock *sk,
@@ -607,18 +647,13 @@ static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
* packet to go through device based features such as qdisc, netfilter
* hooks and packet sockets with skb->dev set to vrf device.
*/
-static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
- struct sock *sk,
- struct sk_buff *skb)
+static struct sk_buff *vrf_ip_out_redirect(struct net_device *vrf_dev,
+ struct sk_buff *skb)
{
struct net_vrf *vrf = netdev_priv(vrf_dev);
struct dst_entry *dst = NULL;
struct rtable *rth;
- /* don't divert multicast */
- if (ipv4_is_multicast(ip_hdr(skb)->daddr))
- return skb;
-
rcu_read_lock();
rth = rcu_dereference(vrf->rth);
@@ -640,6 +675,55 @@ static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
return skb;
}
+static int vrf_output_direct(struct net *net, struct sock *sk,
+ struct sk_buff *skb)
+{
+ skb->protocol = htons(ETH_P_IP);
+
+ return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
+ net, sk, skb, NULL, skb->dev,
+ vrf_finish_direct,
+ !(IPCB(skb)->flags & IPSKB_REROUTED));
+}
+
+static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev,
+ struct sock *sk,
+ struct sk_buff *skb)
+{
+ struct net *net = dev_net(vrf_dev);
+ int err;
+
+ skb->dev = vrf_dev;
+
+ err = nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk,
+ skb, NULL, vrf_dev, vrf_output_direct);
+
+ if (likely(err == 1))
+ err = vrf_output_direct(net, sk, skb);
+
+ /* reset skb device */
+ if (likely(err == 1))
+ nf_reset(skb);
+ else
+ skb = NULL;
+
+ return skb;
+}
+
+static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
+ struct sock *sk,
+ struct sk_buff *skb)
+{
+ /* don't divert multicast */
+ if (ipv4_is_multicast(ip_hdr(skb)->daddr))
+ return skb;
+
+ if (qdisc_tx_is_default(vrf_dev))
+ return vrf_ip_out_direct(vrf_dev, sk, skb);
+
+ return vrf_ip_out_redirect(vrf_dev, skb);
+}
+
/* called with rcu lock held */
static struct sk_buff *vrf_l3_out(struct net_device *vrf_dev,
struct sock *sk,
@@ -1023,9 +1107,11 @@ static struct sk_buff *vrf_ip_rcv(struct net_device *vrf_dev,
vrf_rx_stats(vrf_dev, skb->len);
- skb_push(skb, skb->mac_len);
- dev_queue_xmit_nit(skb, vrf_dev);
- skb_pull(skb, skb->mac_len);
+ if (!list_empty(&vrf_dev->ptype_all)) {
+ skb_push(skb, skb->mac_len);
+ dev_queue_xmit_nit(skb, vrf_dev);
+ skb_pull(skb, skb->mac_len);
+ }
skb = vrf_rcv_nfhook(NFPROTO_IPV4, NF_INET_PRE_ROUTING, skb, vrf_dev);
out: