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net: gro: dev_gro_receive() cleanup 

__napi_gro_receive() is inlined from two call sites for no good reason.

Lets move the prep stuff in a function of its own, called only if/when
needed. This saves 300 bytes on x86 :

# size net/core/dev.o.after net/core/dev.o.before
   text	   data	    bss	    dec	    hex	filename
  51968	   1238	   1040	  54246	   d3e6	net/core/dev.o.before
  51664	   1238	   1040	  53942	   d2b6	net/core/dev.o.after

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-12-10 13:28:16 +00:00 committed by David S. Miller
parent f8e8f97c11
commit 89c5fa3369
1 changed files with 26 additions and 26 deletions
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52
net/core/dev.c
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@ -3603,6 +3603,28 @@ void napi_gro_flush(struct napi_struct *napi, bool flush_old)
}
EXPORT_SYMBOL(napi_gro_flush);
static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb)
{
struct sk_buff *p;
unsigned int maclen = skb->dev->hard_header_len;
for (p = napi->gro_list; p; p = p->next) {
unsigned long diffs;
diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
diffs |= p->vlan_tci ^ skb->vlan_tci;
if (maclen == ETH_HLEN)
diffs |= compare_ether_header(skb_mac_header(p),
skb_gro_mac_header(skb));
else if (!diffs)
diffs = memcmp(skb_mac_header(p),
skb_gro_mac_header(skb),
maclen);
NAPI_GRO_CB(p)->same_flow = !diffs;
NAPI_GRO_CB(p)->flush = 0;
}
}
static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
struct sk_buff **pp = NULL;
@ -3619,6 +3641,8 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff
if (skb_is_gso(skb) || skb_has_frag_list(skb))
goto normal;
gro_list_prepare(napi, skb);
rcu_read_lock();
list_for_each_entry_rcu(ptype, head, list) {
if (ptype->type != type || !ptype->callbacks.gro_receive)
@ -3695,30 +3719,6 @@ normal:
goto pull;
}
static inline gro_result_t
__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
struct sk_buff *p;
unsigned int maclen = skb->dev->hard_header_len;
for (p = napi->gro_list; p; p = p->next) {
unsigned long diffs;
diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
diffs |= p->vlan_tci ^ skb->vlan_tci;
if (maclen == ETH_HLEN)
diffs |= compare_ether_header(skb_mac_header(p),
skb_gro_mac_header(skb));
else if (!diffs)
diffs = memcmp(skb_mac_header(p),
skb_gro_mac_header(skb),
maclen);
NAPI_GRO_CB(p)->same_flow = !diffs;
NAPI_GRO_CB(p)->flush = 0;
}
return dev_gro_receive(napi, skb);
}
static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
{
@ -3768,7 +3768,7 @@ gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
skb_gro_reset_offset(skb);
return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
return napi_skb_finish(dev_gro_receive(napi, skb), skb);
}
EXPORT_SYMBOL(napi_gro_receive);
@ -3866,7 +3866,7 @@ gro_result_t napi_gro_frags(struct napi_struct *napi)
if (!skb)
return GRO_DROP;
return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
}
EXPORT_SYMBOL(napi_gro_frags);