mirror of
https://github.com/Ysurac/openmptcprouter.git
synced 2025-02-15 04:42:02 +00:00
40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
From 0a76b56e61cf7745b8012299c8bc72e1a8fd6d05 Mon Sep 17 00:00:00 2001
|
|
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
|
|
Date: Tue, 10 Apr 2018 13:08:36 +0100
|
|
Subject: [PATCH 302/321] net: lan78xx: Reduce s/w csum check on VLANs
|
|
|
|
With HW_VLAN_CTAG_RX enabled we don't observe the checksum
|
|
issue, so amend the workaround to only drop back to s/w
|
|
checksums if VLAN offload is disabled.
|
|
|
|
See #2458.
|
|
|
|
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
|
|
---
|
|
drivers/net/usb/lan78xx.c | 7 ++++---
|
|
1 file changed, 4 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
|
|
index ebf5dfa98cc0..28c47345420a 100644
|
|
--- a/drivers/net/usb/lan78xx.c
|
|
+++ b/drivers/net/usb/lan78xx.c
|
|
@@ -2985,12 +2985,13 @@ static void lan78xx_rx_csum_offload(struct lan78xx_net *dev,
|
|
struct sk_buff *skb,
|
|
u32 rx_cmd_a, u32 rx_cmd_b)
|
|
{
|
|
- /* Checksum offload appears to be flawed if used with VLANs.
|
|
- * Elect for sw checksum check instead.
|
|
+ /* HW Checksum offload appears to be flawed if used when not stripping
|
|
+ * VLAN headers.
|
|
*/
|
|
if (!(dev->net->features & NETIF_F_RXCSUM) ||
|
|
unlikely(rx_cmd_a & RX_CMD_A_ICSM_) ||
|
|
- (rx_cmd_a & RX_CMD_A_FVTG_)) {
|
|
+ ((rx_cmd_a & RX_CMD_A_FVTG_) &&
|
|
+ !(dev->net->features & NETIF_F_HW_VLAN_CTAG_RX))) {
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
} else {
|
|
skb->csum = ntohs((u16)(rx_cmd_b >> RX_CMD_B_CSUM_SHIFT_));
|
|
--
|
|
2.16.1
|
|
|