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net: only use a single page of slop in MAX_SKB_FRAGS

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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: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ian Campbell
2011-12-22 23:39:14 +00:00
committed by David S. Miller
parent f87ce5b254
commit 9d4dde5215
1 changed files with 8 additions and 4 deletions
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12
include/linux/skbuff.h
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@@ -128,13 +128,17 @@ struct sk_buff_head {
struct sk_buff; struct sk_buff;
/* To allow 64K frame to be packed as single skb without frag_list. Since /* To allow 64K frame to be packed as single skb without frag_list we
* GRO uses frags we allocate at least 16 regardless of page size. * 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 #define MAX_SKB_FRAGS 16UL
#else #else
#define MAX_SKB_FRAGS (65536/PAGE_SIZE + 2) #define MAX_SKB_FRAGS (65536/PAGE_SIZE + 1)
#endif #endif
typedef struct skb_frag_struct skb_frag_t; typedef struct skb_frag_struct skb_frag_t;