Commit 57834ca1 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jeff Garzik
Browse files

[PATCH] chelsio: use standard CRC routines 



Replace driver crc calculation with existing library.

Signed-off-by: default avatarStephen Hemminger <shemminger@osdl.org>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent a7377a50

drivers/net/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -2360,6 +2360,7 @@ menu "Ethernet (10000 Mbit)" 
config CHELSIO_T1

        tristate "Chelsio 10Gb Ethernet support"

        depends on PCI

	select CRC32

        help

          This driver supports Chelsio gigabit and 10-gigabit

          Ethernet cards. More information about adapter features and

drivers/net/chelsio/pm3393.c

+3 −28
Original line number Diff line number Diff line
@@ -43,6 +43,8 @@ 
#include "elmer0.h"

#include "suni1x10gexp_regs.h"



#include <linux/crc32.h>



#define OFFSET(REG_ADDR)    (REG_ADDR << 2)



/* Max frame size PM3393 can handle. Includes Ethernet header and CRC. */
@@ -345,33 +347,6 @@ static int pm3393_set_mtu(struct cmac *cmac, int mtu) 
	return 0;

}



static u32 calc_crc(u8 *b, int len)

{

	int i;

	u32 crc = (u32)~0;



	/* calculate crc one bit at a time */

	while (len--) {

		crc ^= *b++;

		for (i = 0; i < 8; i++) {

			if (crc & 0x1)

				crc = (crc >> 1) ^ 0xedb88320;

			else

				crc = (crc >> 1);

		}

	}



	/* reverse bits */

	crc = ((crc >> 4) & 0x0f0f0f0f) | ((crc << 4) & 0xf0f0f0f0);

	crc = ((crc >> 2) & 0x33333333) | ((crc << 2) & 0xcccccccc);

	crc = ((crc >> 1) & 0x55555555) | ((crc << 1) & 0xaaaaaaaa);

	/* swap bytes */

	crc = (crc >> 16) | (crc << 16);

	crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);



	return crc;

}



static int pm3393_set_rx_mode(struct cmac *cmac, struct t1_rx_mode *rm)

{

	int enabled = cmac->instance->enabled & MAC_DIRECTION_RX;
@@ -405,7 +380,7 @@ static int pm3393_set_rx_mode(struct cmac *cmac, struct t1_rx_mode *rm) 
		u16 mc_filter[4] = { 0, };



		while ((addr = t1_get_next_mcaddr(rm))) {

			bit = (calc_crc(addr, ETH_ALEN) >> 23) & 0x3f;	/* bit[23:28] */

			bit = (ether_crc(ETH_ALEN, addr) >> 23) & 0x3f;	/* bit[23:28] */

			mc_filter[bit >> 4] |= 1 << (bit & 0xf);

		}

		pmwrite(cmac, SUNI1x10GEXP_REG_RXXG_MULTICAST_HASH_LOW, mc_filter[0]);