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

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>
tags/v1.20.1
Michael Brown hace 12 años
padre
commit
1d77d03216
Se han modificado 3 ficheros con 24 adiciones y 4 borrados
  1. 12
    0
      src/arch/x86/include/bits/tcpip.h
  2. 10
    2
      src/include/ipxe/tcpip.h
  3. 2
    2
      src/net/tcpip.c

+ 12
- 0
src/arch/x86/include/bits/tcpip.h Ver fichero

@@ -0,0 +1,12 @@
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+#ifndef _BITS_TCPIP_H
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+#define _BITS_TCPIP_H
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+
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+/** @file
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+ *
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+ * Transport-network layer interface
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+ *
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+ */
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+
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+FILE_LICENCE ( GPL2_OR_LATER );
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+
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+#endif /* _BITS_TCPIP_H */

+ 10
- 2
src/include/ipxe/tcpip.h Ver fichero

@@ -13,6 +13,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
13 13
 #include <ipxe/socket.h>
14 14
 #include <ipxe/in.h>
15 15
 #include <ipxe/tables.h>
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+#include <bits/tcpip.h>
16 17
 
17 18
 struct io_buffer;
18 19
 struct net_device;
@@ -121,8 +122,15 @@ extern int tcpip_tx ( struct io_buffer *iobuf, struct tcpip_protocol *tcpip,
121 122
 		      struct sockaddr_tcpip *st_dest,
122 123
 		      struct net_device *netdev,
123 124
 		      uint16_t *trans_csum );
124
-extern uint16_t tcpip_continue_chksum ( uint16_t partial,
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-					const void *data, size_t len );
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+extern uint16_t generic_tcpip_continue_chksum ( uint16_t partial,
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+						const void *data, size_t len );
126 127
 extern uint16_t tcpip_chksum ( const void *data, size_t len );
127 128
 
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+/* Use generic_tcpip_continue_chksum() if no architecture-specific
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+ * version is available
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+ */
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+#ifndef tcpip_continue_chksum
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+#define tcpip_continue_chksum generic_tcpip_continue_chksum
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+#endif
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+
128 136
 #endif /* _IPXE_TCPIP_H */

+ 2
- 2
src/net/tcpip.c Ver fichero

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

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