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Date:   Thu, 26 Dec 2019 13:34:58 -0800
From:   Tom Herbert <>
Cc:     Tom Herbert <>
Subject: [PATCH net-next 1/2] net: Documentation about deprecating NETIF_F_IP{V6}_CSUM

Add text in netdev-features.txt documenting that NETIF_F_IP_CSUM and
NETIF_F_IPV6_CSUM are being deprecated in favor of NETIF_F_HW_CSUM.
Suggest that legacy drivers can be fixed by advertising NETIF_F_HW_CSUM
and checking skb->protocol.

Signed-off-by: Tom Herbert <>
 Documentation/networking/netdev-features.txt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/networking/netdev-features.txt b/Documentation/networking/netdev-features.txt
index 58dd1c1..8500ada 100644
--- a/Documentation/networking/netdev-features.txt
+++ b/Documentation/networking/netdev-features.txt
@@ -106,7 +106,12 @@ For complete description, see comments near the top of include/linux/skbuff.h.
 Note: NETIF_F_HW_CSUM is a superset of NETIF_F_IP_CSUM + NETIF_F_IPV6_CSUM.
 It means that device can fill TCP/UDP-like checksum anywhere in the packets
-whatever headers there might be.
+whatever headers there might be. NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM are
+deprecated in favor of NETIF_F_HW_CSUM. Legacy drivers can be converted
+by advertising NETIF_F_HW_CSUM and checking skb->protocol for ETH_P_IP or
+ETH_P_IPV6, if the device does not support checksum offload for the protocol
+in skb->protocol then it can call skb_checksum_help to perform the checksum
+on the host.
  * Transmit TCP segmentation offload

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