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[Qemu-devel] [PULL 04/18] net: introduce net_crc32_le() function
From: |
Jason Wang |
Subject: |
[Qemu-devel] [PULL 04/18] net: introduce net_crc32_le() function |
Date: |
Fri, 22 Dec 2017 10:15:23 +0800 |
From: Mark Cave-Ayland <address@hidden>
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>
Signed-off-by: Jason Wang <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 586098c..4afac1a 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 a14dc99..4ecaf80 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;
--
2.7.4
- [Qemu-devel] [PULL 00/18] Net patches, Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 01/18] e1000, e1000e: Move per-packet TX offload flags out of context state, Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 02/18] e1000: Separate TSO and non-TSO contexts, fixing UDP TX corruption, Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 03/18] net: move CRC32 calculation from compute_mcast_idx() into its own net_crc32() function, Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 04/18] net: introduce net_crc32_le() function,
Jason Wang <=
- [Qemu-devel] [PULL 05/18] pcnet: switch pcnet over to use net_crc32_le(), Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 06/18] eepro100: switch eepro100 e100_compute_mcast_idx() over to use net_crc32(), Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 07/18] sunhme: switch sunhme over to use net_crc32_le(), Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 08/18] sungem: fix multicast filter CRC calculation, Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 09/18] eepro100: use inline net_crc32() and bitshift instead of compute_mcast_idx(), Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 10/18] opencores_eth: use inline net_crc32() and bitshift instead of compute_mcast_idx(), Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 11/18] lan9118: use inline net_crc32() and bitshift instead of compute_mcast_idx(), Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 12/18] ftgmac100: use inline net_crc32() and bitshift instead of compute_mcast_idx(), Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 13/18] ne2000: use inline net_crc32() and bitshift instead of compute_mcast_idx(), Jason Wang, 2017/12/21
- [Qemu-devel] [PULL 14/18] rtl8139: use inline net_crc32() and bitshift instead of compute_mcast_idx(), Jason Wang, 2017/12/21