[PATCH] chelsio: use standard CRC routines

Replace driver crc calculation with existing library.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

2 files changed, 4 insertions, 28 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index ee391f29dae7..9de0eed6755b 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -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
diff --git a/drivers/net/chelsio/pm3393.c b/drivers/net/chelsio/pm3393.c
index a1d15eebe12c..63cabeb98afe 100644
--- a/drivers/net/chelsio/pm3393.c
+++ b/drivers/net/chelsio/pm3393.c
@@ -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]);