e1000e: disable ASPM L1 on 82573

On the e1000-devel mailing list, Nils Faerber reported latency issues with
the 82573 LOM on a ThinkPad X60.  It was found to be caused by ASPM L1;
disabling it resolves the latency.  The issue is present in kernels back
to 2.6.34 and possibly 2.6.33.

Reported-by: Nils Faerber <[email protected]>
Signed-off-by: Bruce Allan <[email protected]>
Cc: [email protected]
Signed-off-by: Jeff Kirsher <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/drivers/net/e1000e/82571.c b/drivers/net/e1000e/82571.c
index a4a0d2b6eb1c60e116811b31378a426ad00a44e2..f844e6c6063b473c5998abfca09ed38ae17fe1ad 100644 (file)
--- a/drivers/net/e1000e/82571.c
+++ b/drivers/net/e1000e/82571.c
@@ -1833,6 +1833,7 @@ struct e1000_info e1000_82573_info = {
                                  | FLAG_HAS_SMART_POWER_DOWN
                                  | FLAG_HAS_AMT
                                  | FLAG_HAS_SWSM_ON_LOAD,
+       .flags2                 = FLAG2_DISABLE_ASPM_L1,
        .pba                    = 20,
        .max_hw_frame_size      = ETH_FRAME_LEN + ETH_FCS_LEN,
        .get_variants           = e1000_get_variants_82571,