Commit 8a29111c authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net: gro: allow to build full sized skb

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

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

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

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: default avatarEric Dumazet <>
Signed-off-by: default avatarDavid S. Miller <>
parent 4c60f1d6
......@@ -2936,32 +2936,30 @@ EXPORT_SYMBOL_GPL(skb_segment);
int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
struct sk_buff *p = *head;
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);
struct skb_shared_info *pinfo, *skbinfo = skb_shinfo(skb);
unsigned int offset = skb_gro_offset(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 headroom;
if (p->len + len >= 65536)
if (unlikely(p->len + len >= 65536))
return -E2BIG;
if (pinfo->frag_list)
goto merge;
else if (headlen <= offset) {
lp = NAPI_GRO_CB(p)->last ?: p;
pinfo = skb_shinfo(lp);
if (headlen <= offset) {
skb_frag_t *frag;
skb_frag_t *frag2;
int i = skbinfo->nr_frags;
int nr_frags = pinfo->nr_frags + i;
offset -= headlen;
if (nr_frags > MAX_SKB_FRAGS)
return -E2BIG;
goto merge;
offset -= headlen;
pinfo->nr_frags = nr_frags;
skbinfo->nr_frags = 0;
......@@ -2992,7 +2990,7 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
unsigned int first_offset;
if (nr_frags + 1 + skbinfo->nr_frags > MAX_SKB_FRAGS)
return -E2BIG;
goto merge;
first_offset = skb->data -
(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));
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;
headroom = skb_headroom(p);
......@@ -3062,16 +3063,24 @@ int skb_gro_receive(struct sk_buff **head, struct sk_buff *skb)
__skb_pull(skb, offset);
if (!NAPI_GRO_CB(p)->last)
skb_shinfo(p)->frag_list = skb;
NAPI_GRO_CB(p)->last->next = skb;
NAPI_GRO_CB(p)->last = skb;
lp = p;
p->data_len += len;
p->truesize += delta_truesize;
p->len += len;
if (lp != p) {
lp->data_len += len;
lp->truesize += delta_truesize;
lp->len += len;
NAPI_GRO_CB(skb)->same_flow = 1;
return 0;
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