bnx2x: add Big-Endian ethtool comment

There's a known issue that using `ethtool -e' flips the endianity of the
written data, i.e., using `ethtool -E' to dump eeprom image and than using
`ethtool -e' to re-write that same image will result in an image where
the data has the opposite endianity.
Sadly, this cannot be fixed as there are already various tools deployed
based on the endianity of the eeprom read/write.
Instead, a comment is added to the code to help explain why this is un-fixable.

Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
index 32d0f1435fb410b54c3105236c14a211f35bc0b2..92a467ff4104da3bedd8aa6762c51c19ea977a22 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
@@ -1639,6 +1639,12 @@ static int bnx2x_nvram_write(struct bnx2x *bp, u32 offset, u8 *data_buf,
 
                memcpy(&val, data_buf, 4);
 
+               /* Notice unlike bnx2x_nvram_read_dword() this will not
+                * change val using be32_to_cpu(), which causes data to flip
+                * if the eeprom is read and then written back. This is due
+                * to tools utilizing this functionality that would break
+                * if this would be resolved.
+                */
                rc = bnx2x_nvram_write_dword(bp, offset, val, cmd_flags);
 
                /* advance to the next dword */