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net: gro: allow to build full sized skb

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skb_gro_receive() is currently limited to 16 or 17 MSS per GRO skb,
typically 24616 bytes, because it fills up to MAX_SKB_FRAGS frags.

It's relatively easy to extend the skb using frag_list to allow
more frags to be appended into the last sk_buff.

This still builds very efficient skbs, and allows reaching 45 MSS per
skb.

(45 MSS GRO packet uses one skb plus a frag_list containing 2 additional
sk_buff)

High speed TCP flows benefit from this extension by lowering TCP stack
cpu usage (less packets stored in receive queue, less ACK packets
processed)

Forwarding setups could be hurt, as such skbs will need to be
linearized, although its not a new problem, as GRO could already
provide skbs with a frag_list.

We could make the 65536 bytes threshold a tunable to mitigate this.

(First time we need to linearize skb in skb_needs_linearize(), we could
lower the tunable to ~16*1460 so that following skb_gro_receive() calls
build smaller skbs)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2013-10-08 09:02:23 -07:00 committed by David S. Miller
parent 4c60f1d67f
commit 8a29111c7c
1 changed files with 26 additions and 17 deletions
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43
net/core/skbuff.c
View File

@ -2936,32 +2936,30 @@ EXPORT_SYMBOL_GPL(skb_segment);
int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb) int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
{ {
struct sk_buff *p = *head; struct skb_shared_info *pinfo, *skbinfo = skb_shinfo(skb);
struct sk_buff *nskb;
struct skb_shared_info *skbinfo = skb_shinfo(skb);
struct skb_shared_info *pinfo = skb_shinfo(p);
unsigned int headroom;
unsigned int len = skb_gro_len(skb);
unsigned int offset = skb_gro_offset(skb); unsigned int offset = skb_gro_offset(skb);
unsigned int headlen = skb_headlen(skb); unsigned int headlen = skb_headlen(skb);
struct sk_buff *nskb, *lp, *p = *head;
unsigned int len = skb_gro_len(skb);
unsigned int delta_truesize; unsigned int delta_truesize;
unsigned int headroom;
if (p->len + len >= 65536) if (unlikely(p->len + len >= 65536))
return -E2BIG; return -E2BIG;
if (pinfo->frag_list) lp = NAPI_GRO_CB(p)->last ?: p;
goto merge; pinfo = skb_shinfo(lp);
else if (headlen <= offset) {
if (headlen <= offset) {
skb_frag_t *frag; skb_frag_t *frag;
skb_frag_t *frag2; skb_frag_t *frag2;
int i = skbinfo->nr_frags; int i = skbinfo->nr_frags;
int nr_frags = pinfo->nr_frags + i; int nr_frags = pinfo->nr_frags + i;
offset -= headlen;
if (nr_frags > MAX_SKB_FRAGS) if (nr_frags > MAX_SKB_FRAGS)
return -E2BIG; goto merge;
offset -= headlen;
pinfo->nr_frags = nr_frags; pinfo->nr_frags = nr_frags;
skbinfo->nr_frags = 0; skbinfo->nr_frags = 0;
@ -2992,7 +2990,7 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
unsigned int first_offset; unsigned int first_offset;
if (nr_frags + 1 + skbinfo->nr_frags > MAX_SKB_FRAGS) if (nr_frags + 1 + skbinfo->nr_frags > MAX_SKB_FRAGS)
return -E2BIG; goto merge;
first_offset = skb->data - first_offset = skb->data -
(unsigned char *)page_address(page) + (unsigned char *)page_address(page) +
@ -3010,7 +3008,10 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
delta_truesize = skb->truesize - SKB_DATA_ALIGN(sizeof(struct sk_buff)); delta_truesize = skb->truesize - SKB_DATA_ALIGN(sizeof(struct sk_buff));
NAPI_GRO_CB(skb)->free = NAPI_GRO_FREE_STOLEN_HEAD; NAPI_GRO_CB(skb)->free = NAPI_GRO_FREE_STOLEN_HEAD;
goto done; goto done;
} else if (skb_gro_len(p) != pinfo->gso_size) }
if (pinfo->frag_list)
goto merge;
if (skb_gro_len(p) != pinfo->gso_size)
return -E2BIG; return -E2BIG;
headroom = skb_headroom(p); headroom = skb_headroom(p);
@ -3062,16 +3063,24 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
__skb_pull(skb, offset); __skb_pull(skb, offset);
NAPI_GRO_CB(p)->last->next = skb; if (!NAPI_GRO_CB(p)->last)
skb_shinfo(p)->frag_list = skb;
else
NAPI_GRO_CB(p)->last->next = skb;
NAPI_GRO_CB(p)->last = skb; NAPI_GRO_CB(p)->last = skb;
skb_header_release(skb); skb_header_release(skb);
lp = p;
done: done:
NAPI_GRO_CB(p)->count++; NAPI_GRO_CB(p)->count++;
p->data_len += len; p->data_len += len;
p->truesize += delta_truesize; p->truesize += delta_truesize;
p->len += len; p->len += len;
if (lp != p) {
lp->data_len += len;
lp->truesize += delta_truesize;
lp->len += len;
}
NAPI_GRO_CB(skb)->same_flow = 1; NAPI_GRO_CB(skb)->same_flow = 1;
return 0; return 0;
} }