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[Qemu-devel] [PATCHv3 02/13] net: introduce net_crc32_le() function
From: |
Mark Cave-Ayland |
Subject: |
[Qemu-devel] [PATCHv3 02/13] net: introduce net_crc32_le() function |
Date: |
Fri, 15 Dec 2017 18:41:44 +0000 |
This provides a standard ethernet CRC32 little-endian implementation.
Signed-off-by: Mark Cave-Ayland <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
---
include/net/net.h | 2 ++
net/net.c | 22 ++++++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/include/net/net.h b/include/net/net.h
index 586098cb94..4afac1a9dd 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -228,7 +228,9 @@ NetClientState *net_hub_port_find(int hub_id);
void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd);
#define POLYNOMIAL_BE 0x04c11db6
+#define POLYNOMIAL_LE 0xedb88320
uint32_t net_crc32(const uint8_t *p, int len);
+uint32_t net_crc32_le(const uint8_t *p, int len);
unsigned compute_mcast_idx(const uint8_t *ep);
#define vmstate_offset_macaddr(_state, _field) \
diff --git a/net/net.c b/net/net.c
index a14dc9910c..4ecaf80bd1 100644
--- a/net/net.c
+++ b/net/net.c
@@ -1603,6 +1603,28 @@ uint32_t net_crc32(const uint8_t *p, int len)
return crc;
}
+uint32_t net_crc32_le(const uint8_t *p, int len)
+{
+ uint32_t crc;
+ int carry, i, j;
+ uint8_t b;
+
+ crc = 0xffffffff;
+ for (i = 0; i < len; i++) {
+ b = *p++;
+ for (j = 0; j < 8; j++) {
+ carry = (crc & 0x1) ^ (b & 0x01);
+ crc >>= 1;
+ b >>= 1;
+ if (carry) {
+ crc ^= POLYNOMIAL_LE;
+ }
+ }
+ }
+
+ return crc;
+}
+
unsigned compute_mcast_idx(const uint8_t *ep)
{
return net_crc32(ep, ETH_ALEN) >> 26;
--
2.11.0
- [Qemu-devel] [PATCHv3 00/13] net: introduce common net_crc32() and net_crc32_le() functions, Mark Cave-Ayland, 2017/12/15
- [Qemu-devel] [PATCHv3 06/13] sungem: fix multicast filter CRC calculation, Mark Cave-Ayland, 2017/12/15
- [Qemu-devel] [PATCHv3 02/13] net: introduce net_crc32_le() function,
Mark Cave-Ayland <=
- [Qemu-devel] [PATCHv3 01/13] net: move CRC32 calculation from compute_mcast_idx() into its own net_crc32() function, Mark Cave-Ayland, 2017/12/15
- [Qemu-devel] [PATCHv3 09/13] lan9118: use inline net_crc32() and bitshift instead of compute_mcast_idx(), Mark Cave-Ayland, 2017/12/15
- [Qemu-devel] [PATCHv3 08/13] opencores_eth: use inline net_crc32() and bitshift instead of compute_mcast_idx(), Mark Cave-Ayland, 2017/12/15
- [Qemu-devel] [PATCHv3 07/13] eepro100: use inline net_crc32() and bitshift instead of compute_mcast_idx(), Mark Cave-Ayland, 2017/12/15
- [Qemu-devel] [PATCHv3 03/13] pcnet: switch pcnet over to use net_crc32_le(), Mark Cave-Ayland, 2017/12/15
- [Qemu-devel] [PATCHv3 04/13] eepro100: switch eepro100 e100_compute_mcast_idx() over to use net_crc32(), Mark Cave-Ayland, 2017/12/15
- [Qemu-devel] [PATCHv3 05/13] sunhme: switch sunhme over to use net_crc32_le(), Mark Cave-Ayland, 2017/12/15
- [Qemu-devel] [PATCHv3 12/13] rtl8139: use inline net_crc32() and bitshift instead of compute_mcast_idx(), Mark Cave-Ayland, 2017/12/15
- [Qemu-devel] [PATCHv3 10/13] ftgmac100: use inline net_crc32() and bitshift instead of compute_mcast_idx(), Mark Cave-Ayland, 2017/12/15