Patch "e1000e: Disable TSO on i219-LM card to increase speed" has been added to the 4.14-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    e1000e: Disable TSO on i219-LM card to increase speed

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     e1000e-disable-tso-on-i219-lm-card-to-increase-speed.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit f37d52f208aff7ab5f6f515992e8b577fa127844
Author: Sebastian Basierski <sebastianx.basierski@xxxxxxxxx>
Date:   Mon Apr 17 13:53:45 2023 -0700

    e1000e: Disable TSO on i219-LM card to increase speed
    
    [ Upstream commit 67d47b95119ad589b0a0b16b88b1dd9a04061ced ]
    
    While using i219-LM card currently it was only possible to achieve
    about 60% of maximum speed due to regression introduced in Linux 5.8.
    This was caused by TSO not being disabled by default despite commit
    f29801030ac6 ("e1000e: Disable TSO for buffer overrun workaround").
    Fix that by disabling TSO during driver probe.
    
    Fixes: f29801030ac6 ("e1000e: Disable TSO for buffer overrun workaround")
    Signed-off-by: Sebastian Basierski <sebastianx.basierski@xxxxxxxxx>
    Signed-off-by: Mateusz Palczewski <mateusz.palczewski@xxxxxxxxx>
    Tested-by: Naama Meir <naamax.meir@xxxxxxxxxxxxxxx>
    Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
    Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230417205345.1030801-1-anthony.l.nguyen@xxxxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index cb3ff3c2fb03f..d41ebc50eeaa2 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -5250,31 +5250,6 @@ static void e1000_watchdog_task(struct work_struct *work)
 				ew32(TARC(0), tarc0);
 			}
 
-			/* disable TSO for pcie and 10/100 speeds, to avoid
-			 * some hardware issues
-			 */
-			if (!(adapter->flags & FLAG_TSO_FORCE)) {
-				switch (adapter->link_speed) {
-				case SPEED_10:
-				case SPEED_100:
-					e_info("10/100 speed: disabling TSO\n");
-					netdev->features &= ~NETIF_F_TSO;
-					netdev->features &= ~NETIF_F_TSO6;
-					break;
-				case SPEED_1000:
-					netdev->features |= NETIF_F_TSO;
-					netdev->features |= NETIF_F_TSO6;
-					break;
-				default:
-					/* oops */
-					break;
-				}
-				if (hw->mac.type == e1000_pch_spt) {
-					netdev->features &= ~NETIF_F_TSO;
-					netdev->features &= ~NETIF_F_TSO6;
-				}
-			}
-
 			/* enable transmits in the hardware, need to do this
 			 * after setting TARC(0)
 			 */
@@ -7211,6 +7186,32 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			    NETIF_F_RXCSUM |
 			    NETIF_F_HW_CSUM);
 
+	/* disable TSO for pcie and 10/100 speeds to avoid
+	 * some hardware issues and for i219 to fix transfer
+	 * speed being capped at 60%
+	 */
+	if (!(adapter->flags & FLAG_TSO_FORCE)) {
+		switch (adapter->link_speed) {
+		case SPEED_10:
+		case SPEED_100:
+			e_info("10/100 speed: disabling TSO\n");
+			netdev->features &= ~NETIF_F_TSO;
+			netdev->features &= ~NETIF_F_TSO6;
+			break;
+		case SPEED_1000:
+			netdev->features |= NETIF_F_TSO;
+			netdev->features |= NETIF_F_TSO6;
+			break;
+		default:
+			/* oops */
+			break;
+		}
+		if (hw->mac.type == e1000_pch_spt) {
+			netdev->features &= ~NETIF_F_TSO;
+			netdev->features &= ~NETIF_F_TSO6;
+		}
+	}
+
 	/* Set user-changeable features (subset of all device features) */
 	netdev->hw_features = netdev->features;
 	netdev->hw_features |= NETIF_F_RXFCS;