diff options
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/gpxe/pkbuff.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/include/gpxe/pkbuff.h b/src/include/gpxe/pkbuff.h index 895367ae5..646b540dc 100644 --- a/src/include/gpxe/pkbuff.h +++ b/src/include/gpxe/pkbuff.h @@ -17,6 +17,17 @@ struct net_protocol; struct ll_protocol; +/** + * Packet buffer alignment + * + * Packet buffers allocated via alloc_pkb() are guaranteed to be + * physically aligned to this boundary. Some cards cannot DMA across + * a 4kB boundary. With a standard Ethernet MTU, aligning to a 2kB + * boundary is sufficient to guarantee no 4kB boundary crossings. For + * a jumbo Ethernet MTU, a packet may be larger than 4kB anyway. + */ +#define PKBUFF_ALIGN 2048 + /** A packet buffer * * This structure is used to represent a network packet within gPXE. |