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From 126c6760f56d2d7a82c605a54c402a886ae9b5bf Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.org>
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Date: Tue, 10 Apr 2018 13:08:36 +0100
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Subject: [PATCH 272/454] net: lan78xx: Reduce s/w csum check on VLANs
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With HW_VLAN_CTAG_RX enabled we don't observe the checksum
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issue, so amend the workaround to only drop back to s/w
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checksums if VLAN offload is disabled.
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See #2458.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
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---
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drivers/net/usb/lan78xx.c | 7 ++++---
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1 file changed, 4 insertions(+), 3 deletions(-)
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--- a/drivers/net/usb/lan78xx.c
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+++ b/drivers/net/usb/lan78xx.c
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@@ -2971,12 +2971,13 @@ static void lan78xx_rx_csum_offload(stru
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struct sk_buff *skb,
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u32 rx_cmd_a, u32 rx_cmd_b)
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{
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- /* Checksum offload appears to be flawed if used with VLANs.
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- * Elect for sw checksum check instead.
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+ /* HW Checksum offload appears to be flawed if used when not stripping
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+ * VLAN headers.
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*/
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if (!(dev->net->features & NETIF_F_RXCSUM) ||
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unlikely(rx_cmd_a & RX_CMD_A_ICSM_) ||
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- (rx_cmd_a & RX_CMD_A_FVTG_)) {
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+ ((rx_cmd_a & RX_CMD_A_FVTG_) &&
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+ !(dev->net->features & NETIF_F_HW_VLAN_CTAG_RX))) {
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skb->ip_summed = CHECKSUM_NONE;
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} else {
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skb->csum = ntohs((u16)(rx_cmd_b >> RX_CMD_B_CSUM_SHIFT_));
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