netdev - [PATCH net-next 1/2] net: Documentation about deprecating NETIF_F_IP{V6}

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1577396099-3831-2-git-send-email-tom@herbertland.com>
Date:   Thu, 26 Dec 2019 13:34:58 -0800
From:   Tom Herbert <tom@...bertland.com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     Tom Herbert <tom@...bertland.com>
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 <tom@...bertland.com>
---
 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
 
-- 
2.7.4