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net: checksum: Introduce fine control over checksum type

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At present net_checksum_calculate() blindly calculates all types of
checksums (IP, TCP, UDP). Some NICs may have a per type setting in
their BDs to control what checksum should be offloaded. To support
such hardware behavior, introduce a 'csum_flag' parameter to the
net_checksum_calculate() API to allow fine control over what type
checksum is calculated.

Existing users of this API are updated accordingly.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Bin Meng 2020-12-11 17:35:12 +08:00 • committed by Jason Wang
parent d97f11590a
commit f574633529
10 changed files with 55 additions and 33 deletions
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7
include/net/checksum.h
View file

@ -21,11 +21,16 @@
#include "qemu/bswap.h"
struct iovec;
#define CSUM_IP 0x01
#define CSUM_TCP 0x02
#define CSUM_UDP 0x04
#define CSUM_ALL (CSUM_IP | CSUM_TCP | CSUM_UDP)
uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq);
uint16_t net_checksum_finish(uint32_t sum);
uint16_t net_checksum_tcpudp(uint16_t length, uint16_t proto,
uint8_t *addrs, uint8_t *buf);
void net_checksum_calculate(uint8_t *data, int length);
void net_checksum_calculate(uint8_t *data, int length, int csum_flag);
static inline uint32_t
net_checksum_add(int len, uint8_t *buf)