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Date: Fri, 14 Sep 2012 19:45:25 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: Maciej Żenczykowski <maze@...gle.com>
Cc: David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/2] gre: add GSO support
On Fri, 2012-09-14 at 10:12 -0700, Maciej Żenczykowski wrote:
> Thanks!
>
> So I'm guessing it should be easy to add support like this to IPIP and
> SIT now as well
> (not sure if they're missing, but I'd assume so)?
Yes, absolutely.
I was also playing adding GRO support to tunnels.
Here the prototype patch I currently have, it gives very nice speedups
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index b062a98..ca6ab66 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -589,6 +589,65 @@ ipgre_ecn_encapsulate(u8 tos, const struct iphdr *old_iph, struct sk_buff *skb)
return INET_ECN_encapsulate(tos, inner);
}
+static void tunnel_prequeue(struct ip_tunnel *tunnel, struct sk_buff *skb)
+{
+ unsigned long flags;
+ const struct iphdr *iph;
+
+ if (skb_cloned(skb)) {
+ netif_rx(skb);
+ return;
+ }
+ if (!pskb_may_pull(skb, sizeof(*iph)) ||
+ skb_queue_len(&tunnel->napi_skbs) > 1000) {
+drop:
+ atomic_long_inc(&tunnel->dev->rx_dropped);
+ kfree_skb(skb);
+ return;
+ }
+ iph = ip_hdr(skb);
+ if (*(u8 *)iph == 0x45 &&
+ iph->protocol == IPPROTO_TCP &&
+ skb->ip_summed == CHECKSUM_NONE) {
+ __skb_pull(skb, sizeof(*iph));
+
+ skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
+ skb->len, IPPROTO_TCP, 0);
+ if (__skb_checksum_complete(skb))
+ goto drop;
+
+ __skb_push(skb, sizeof(*iph));
+ }
+
+ spin_lock_irqsave(&tunnel->napi_skbs.lock, flags);
+
+ __skb_queue_tail(&tunnel->napi_skbs, skb);
+ if (skb_queue_len(&tunnel->napi_skbs) == 1)
+ napi_schedule(&tunnel->napi);
+
+ spin_unlock_irqrestore(&tunnel->napi_skbs.lock, flags);
+}
+
+static int tunnel_napi_poll(struct napi_struct *napi, int budget)
+{
+ struct ip_tunnel *tunnel = container_of(napi, struct ip_tunnel, napi);
+ struct sk_buff *skb;
+ int work_done = 0;
+
+ while (work_done < budget) {
+ skb = skb_dequeue(&tunnel->napi_skbs);
+ if (!skb)
+ break;
+ skb->next = NULL;
+ napi_gro_receive(napi, skb);
+ work_done++;
+ }
+
+ if (work_done < budget)
+ napi_complete(napi);
+ return work_done;
+}
+
static int ipgre_rcv(struct sk_buff *skb)
{
const struct iphdr *iph;
@@ -714,8 +773,7 @@ static int ipgre_rcv(struct sk_buff *skb)
skb_reset_network_header(skb);
ipgre_ecn_decapsulate(iph, skb);
- netif_rx(skb);
-
+ tunnel_prequeue(tunnel, skb);
rcu_read_unlock();
return 0;
}
@@ -745,6 +803,10 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
__be32 dst;
int mtu;
+ if (skb->ip_summed == CHECKSUM_PARTIAL &&
+ skb_checksum_help(skb))
+ goto tx_error;
+
if (dev->type == ARPHRD_ETHER)
IPCB(skb)->flags = 0;
@@ -1292,10 +1354,19 @@ static const struct net_device_ops ipgre_netdev_ops = {
static void ipgre_dev_free(struct net_device *dev)
{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+
+ netif_napi_del(&tunnel->napi);
+ skb_queue_purge(&tunnel->napi_skbs);
free_percpu(dev->tstats);
free_netdev(dev);
}
+#define GRE_FEATURES (NETIF_F_SG | \
+ NETIF_F_FRAGLIST | \
+ NETIF_F_HIGHDMA | \
+ NETIF_F_HW_CSUM)
+
static void ipgre_tunnel_setup(struct net_device *dev)
{
dev->netdev_ops = &ipgre_netdev_ops;
@@ -1309,6 +1380,9 @@ static void ipgre_tunnel_setup(struct net_device *dev)
dev->addr_len = 4;
dev->features |= NETIF_F_NETNS_LOCAL;
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
+
+ dev->features |= GRE_FEATURES;
+ dev->hw_features |= GRE_FEATURES;
}
static int ipgre_tunnel_init(struct net_device *dev)
@@ -1340,7 +1414,9 @@ static int ipgre_tunnel_init(struct net_device *dev)
dev->tstats = alloc_percpu(struct pcpu_tstats);
if (!dev->tstats)
return -ENOMEM;
-
+ skb_queue_head_init(&tunnel->napi_skbs);
+ netif_napi_add(dev, &tunnel->napi, tunnel_napi_poll, 64);
+ napi_enable(&tunnel->napi);
return 0;
}
--
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