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bnx2x: byte swap rss_key to comply to Toeplitz specs 

After a good amount of debugging, I found bnx2x was byte swaping
the 40 bytes of rss_key.

If we byte swap the key, then bnx2x generates hashes matching
MSDN specs as documented in (Verifying the RSS Hash Calculation)

https://msdn.microsoft.com/en-us/library/windows/hardware/ff571021%
28v=vs.85%29.aspx

It is mostly a non issue, unless we want to mix different NIC
in a host, and want consistent hashing among all of them, ie
if they all use the boot time generated rss key, or if some application
is choosing specific tuple(s) so that incoming traffic lands into known
rx queue(s).

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-09-22 17:04:58 -07:00 committed by David S. Miller
parent d8aecb1011
commit d682d2bdc3
1 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/net/ethernet/broadcom/bnx2x/bnx2x_sp.c
View File

@ -4319,8 +4319,16 @@ static int bnx2x_setup_rss(struct bnx2x *bp,
/* RSS keys */
if (test_bit(BNX2X_RSS_SET_SRCH, &p->rss_flags)) {
memcpy(&data->rss_key[0], &p->rss_key[0],
sizeof(data->rss_key));
u8 *dst = (u8 *)(data->rss_key) + sizeof(data->rss_key);
const u8 *src = (const u8 *)p->rss_key;
int i;
/* Apparently, bnx2x reads this array in reverse order
* We need to byte swap rss_key to comply with Toeplitz specs.
*/
for (i = 0; i < sizeof(data->rss_key); i++)
*--dst = *src++;
caps |= ETH_RSS_UPDATE_RAMROD_DATA_UPDATE_RSS_KEY;
}