diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0272-net-lan78xx-Reduce-s-w-csum-check-on-VLANs.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.14/950-0272-net-lan78xx-Reduce-s-w-csum-check-on-VLANs.patch | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0272-net-lan78xx-Reduce-s-w-csum-check-on-VLANs.patch b/target/linux/brcm2708/patches-4.14/950-0272-net-lan78xx-Reduce-s-w-csum-check-on-VLANs.patch new file mode 100644 index 0000000000..3582c532fc --- /dev/null +++ b/target/linux/brcm2708/patches-4.14/950-0272-net-lan78xx-Reduce-s-w-csum-check-on-VLANs.patch @@ -0,0 +1,35 @@ +From 126c6760f56d2d7a82c605a54c402a886ae9b5bf 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 272/454] 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(-) + +--- a/drivers/net/usb/lan78xx.c ++++ b/drivers/net/usb/lan78xx.c +@@ -2964,12 +2964,13 @@ static void lan78xx_rx_csum_offload(stru + 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_)); |