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[tcpip] Allow for architecture-specific TCP/IP checksum routines

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Calculating the TCP/IP checksum on received packets accounts for a
substantial fraction of the response latency.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2012-06-27 12:02:58 +01:00
parent 6a4ff519c8
commit 1d77d03216
3 changed files with 24 additions and 4 deletions
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12
src/arch/x86/include/bits/tcpip.h Normal file
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@ -0,0 +1,12 @@
#ifndef _BITS_TCPIP_H
#define _BITS_TCPIP_H
/** @file
*
* Transport-network layer interface
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#endif /* _BITS_TCPIP_H */

12
src/include/ipxe/tcpip.h
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@ -13,6 +13,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <ipxe/socket.h>
#include <ipxe/in.h>
#include <ipxe/tables.h>
#include <bits/tcpip.h>
struct io_buffer;
struct net_device;
@ -121,8 +122,15 @@ extern int tcpip_tx ( struct io_buffer *iobuf, struct tcpip_protocol *tcpip,
struct sockaddr_tcpip *st_dest,
struct net_device *netdev,
uint16_t *trans_csum );
extern uint16_t tcpip_continue_chksum ( uint16_t partial,
const void *data, size_t len );
extern uint16_t generic_tcpip_continue_chksum ( uint16_t partial,
const void *data, size_t len );
extern uint16_t tcpip_chksum ( const void *data, size_t len );
/* Use generic_tcpip_continue_chksum() if no architecture-specific
* version is available
*/
#ifndef tcpip_continue_chksum
#define tcpip_continue_chksum generic_tcpip_continue_chksum
#endif
#endif /* _IPXE_TCPIP_H */

4
src/net/tcpip.c
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@ -97,8 +97,8 @@ int tcpip_tx ( struct io_buffer *iobuf, struct tcpip_protocol *tcpip_protocol,
* or both. Deciding which to swap is left as an exercise for the
* interested reader.
*/
uint16_t tcpip_continue_chksum ( uint16_t partial, const void *data,
size_t len ) {
uint16_t generic_tcpip_continue_chksum ( uint16_t partial,
const void *data, size_t len ) {
unsigned int cksum = ( ( ~partial ) & 0xffff );
unsigned int value;
unsigned int i;