[PATCH 1/1][SRU][B][E][F][G][Unstable] UBUNTU: SAUCE: e1000e: Disable TSO for buffer overrun workaround

[AceLan Kao]

From: Kai-Heng Feng <kai.heng.feng at canonical.com>

BugLink: https://bugs.launchpad.net/bugs/1802691

Commit b10effb92e27 ("e1000e: fix buffer overrun while the I219 is
processing DMA transactions") imposes roughly 30% performance penalty.

The commit log states that "Disabling TSO eliminates performance loss
for TCP traffic without a noticeable impact on CPU performance", so
let's disable TSO by default to regain the loss.

Fixes: b10effb92e27 ("e1000e: fix buffer overrun while the I219 is processing DMA transactions")
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
(cherry picked from commit https://lkml.org/lkml/2020/5/7/676)
Signed-off-by: AceLan Kao <acelan.kao at canonical.com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index cfbdcf4838a7..6e85032d8916 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -5293,6 +5293,10 @@ static void e1000_watchdog_task(struct work_struct *work)
 					/* 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
-- 
2.25.1