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net: Convert GRO SKB handling to list_head.

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Manage pending per-NAPI GRO packets via list_head.

Return an SKB pointer from the GRO receive handlers.  When GRO receive
handlers return non-NULL, it means that this SKB needs to be completed
at this time and removed from the NAPI queue.

Several operations are greatly simplified by this transformation,
especially timing out the oldest SKB in the list when gro_count
exceeds MAX_GRO_SKBS, and napi_gro_flush() which walks the queue
in reverse order.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Miller
2018-06-24 14:13:49 +09:00
committed by David S. Miller
parent 9ff3b40e41
commit d4546c2509
24 changed files with 133 additions and 141 deletions
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4
include/linux/udp.h
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@@ -74,8 +74,8 @@ struct udp_sock {
void (*encap_destroy)(struct sock *sk);
/* GRO functions for UDP socket */
struct sk_buff ** (*gro_receive)(struct sock *sk,
struct sk_buff **head,
struct sk_buff * (*gro_receive)(struct sock *sk,
struct list_head *head,
struct sk_buff *skb);
int (*gro_complete)(struct sock *sk,
struct sk_buff *skb,