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Commit 9d4dde52 authored by Ian Campbell's avatar Ian Campbell Committed by David S. Miller
Browse files

net: only use a single page of slop in MAX_SKB_FRAGS 



In order to accommodate a 64K buffer we need 64K/PAGE_SIZE plus one more page
in order to allow for a buffer which does not start on a page boundary.

Signed-off-by: default avatarIan Campbell <ian.campbell@citrix.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f87ce5b2

include/linux/skbuff.h

+8 −4
Original line number Diff line number Diff line
@@ -128,13 +128,17 @@ struct sk_buff_head { 


struct sk_buff;



/* To allow 64K frame to be packed as single skb without frag_list. Since

 * GRO uses frags we allocate at least 16 regardless of page size.

/* To allow 64K frame to be packed as single skb without frag_list we

 * require 64K/PAGE_SIZE pages plus 1 additional page to allow for

 * buffers which do not start on a page boundary.

 *

 * Since GRO uses frags we allocate at least 16 regardless of page

 * size.

 */

#if (65536/PAGE_SIZE + 2) < 16

#if (65536/PAGE_SIZE + 1) < 16

#define MAX_SKB_FRAGS 16UL

#else

#define MAX_SKB_FRAGS (65536/PAGE_SIZE + 2)

#define MAX_SKB_FRAGS (65536/PAGE_SIZE + 1)

#endif



typedef struct skb_frag_struct skb_frag_t;