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Make PKB_ZLEN the minimum possible size of packet buffer (to allow for

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hardware that can't autopad).
This commit is contained in:
Michael Brown
2006-05-27 13:39:45 +00:00
parent 1dbafa8950
commit 6c50564724
2 changed files with 13 additions and 0 deletions
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9
src/include/gpxe/pkbuff.h
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@@ -28,6 +28,15 @@ struct ll_protocol;
*/ */
#define PKBUFF_ALIGN 2048 #define PKBUFF_ALIGN 2048
/**
* Minimum packet buffer length
*
* alloc_pkb() will round up the allocated length to this size if
* necessary. This is used on behalf of hardware that is not capable
* of auto-padding.
*/
#define PKB_ZLEN 64
/** A packet buffer /** A packet buffer
* *
* This structure is used to represent a network packet within gPXE. * This structure is used to represent a network packet within gPXE.

4
src/net/pkbuff.c
View File

@@ -39,6 +39,10 @@ struct pk_buff * alloc_pkb ( size_t len ) {
struct pk_buff *pkb = NULL; struct pk_buff *pkb = NULL;
void *data; void *data;
/* Pad to minimum length */
if ( len < PKB_ZLEN )
len = PKB_ZLEN;
/* Align buffer length */ /* Align buffer length */
len = ( len + __alignof__( *pkb ) - 1 ) & ~( __alignof__( *pkb ) - 1 ); len = ( len + __alignof__( *pkb ) - 1 ) & ~( __alignof__( *pkb ) - 1 );