tg3: Nullify RSS for loopback test

The loopback test assumes all traffic goes to the first rx queue.  There
is a 1 in 4 chance this won't be true if RSS is enabled though.  This
patch reprograms the RSS indirection table to route all rx packets to
the first queue.

Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 4aecb0a82e564dfb6762a4582c87a2487d14738f..1f233c49b4f096e255d5be7ab526eb0c939fc94a 100644 (file)
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -11269,6 +11269,15 @@ static int tg3_test_loopback(struct tg3 *tp)
                goto done;
        }
 
+       if (tp->tg3_flags3 & TG3_FLG3_ENABLE_RSS) {
+               int i;
+
+               /* Reroute all rx packets to the 1st queue */
+               for (i = MAC_RSS_INDIR_TBL_0;
+                    i < MAC_RSS_INDIR_TBL_0 + TG3_RSS_INDIR_TBL_SIZE; i += 4)
+                       tw32(i, 0x0);
+       }
+
        /* Turn off gphy autopowerdown. */
        if (tp->phy_flags & TG3_PHYFLG_ENABLE_APD)
                tg3_phy_toggle_apd(tp, false);