linux-toradex.git/include/linux/netdev_features.h, branch v6.16-rc6

gso: AccECN support

2025-03-17T13:54:50+00:00

Handling the CWR flag differs between RFC 3168 ECN and AccECN.
With RFC 3168 ECN aware TSO (NETIF_F_TSO_ECN) CWR flag is cleared
starting from 2nd segment which is incompatible how AccECN handles
the CWR flag. Such super-segments are indicated by SKB_GSO_TCP_ECN.
With AccECN, CWR flag (or more accurately, the ACE field that also
includes ECE & AE flags) changes only when new packet(s) with CE
mark arrives so the flag should not be changed within a super-skb.
The new skb/feature flags are necessary to prevent such TSO engines
corrupting AccECN ACE counters by clearing the CWR flag (if the
CWR handling feature cannot be turned off).

If NIC is completely unaware of RFC3168 ECN (doesn't support
NETIF_F_TSO_ECN) or its TSO engine can be set to not touch CWR flag
despite supporting also NETIF_F_TSO_ECN, TSO could be safely used
with AccECN on such NIC. This should be evaluated per NIC basis
(not done in this patch series for any NICs).

For the cases, where TSO cannot keep its hands off the CWR flag,
a GSO fallback is provided by this patch.

Signed-off-by: Ilpo Järvinen 
Signed-off-by: Chia-Yu Chang 
Reviewed-by: Eric Dumazet 
Signed-off-by: David S. Miller

net, team, bonding: Add netdev_base_features helper

2024-12-12T10:59:18+00:00

Both bonding and team driver have logic to derive the base feature
flags before iterating over their slave devices to refine the set
via netdev_increment_features().

Add a small helper netdev_base_features() so this can be reused
instead of having it open-coded multiple times.

Signed-off-by: Daniel Borkmann 
Cc: Nikolay Aleksandrov 
Cc: Ido Schimmel 
Cc: Jiri Pirko 
Reviewed-by: Hangbin Liu 
Reviewed-by: Nikolay Aleksandrov 
Link: https://patch.msgid.link/20241210141245.327886-1-daniel@iogearbox.net
Signed-off-by: Paolo Abeni

netdev_features: remove NETIF_F_ALL_FCOE

2024-09-03T09:36:43+00:00

NETIF_F_ALL_FCOE is used only in vlan_dev.c, 2 times. Now that it's only
2 bits, open-code it and remove the definition from netdev_features.h.

Suggested-by: Jakub Kicinski 
Signed-off-by: Alexander Lobakin 
Signed-off-by: Paolo Abeni

netdev_features: convert NETIF_F_FCOE_MTU to dev->fcoe_mtu

2024-09-03T09:36:43+00:00

Ability to handle maximum FCoE frames of 2158 bytes can never be changed
and thus more of an attribute, not a toggleable feature.
Move it from netdev_features_t to "cold" priv flags (bitfield bool) and
free yet another feature bit.

Signed-off-by: Alexander Lobakin 
Signed-off-by: Paolo Abeni

netdev_features: convert NETIF_F_NETNS_LOCAL to dev->netns_local

2024-09-03T09:36:43+00:00

"Interface can't change network namespaces" is rather an attribute,
not a feature, and it can't be changed via Ethtool.
Make it a "cold" private flag instead of a netdev_feature and free
one more bit.

Signed-off-by: Alexander Lobakin 
Signed-off-by: Paolo Abeni

netdev_features: convert NETIF_F_LLTX to dev->lltx

2024-09-03T09:36:43+00:00

NETIF_F_LLTX can't be changed via Ethtool and is not a feature,
rather an attribute, very similar to IFF_NO_QUEUE (and hot).
Free one netdev_features_t bit and make it a "hot" private flag.

Signed-off-by: Alexander Lobakin 
Signed-off-by: Paolo Abeni

net: Fix features skip in for_each_netdev_feature()

2022-05-06T01:25:57+00:00

The find_next_netdev_feature() macro gets the "remaining length",
not bit index.
Passing "bit - 1" for the following iteration is wrong as it skips
the adjacent bit. Pass "bit" instead.

Fixes: 3b89ea9c5902 ("net: Fix for_each_netdev_feature on Big endian")
Signed-off-by: Tariq Toukan 
Reviewed-by: Gal Pressman 
Link: https://lore.kernel.org/r/20220504080914.1918-1-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski

net: fix mistake path for netdev_features_strings

2021-06-17T18:32:50+00:00

Th_strings arrays netdev_features_strings, tunable_strings, and
phy_tunable_strings has been moved to file net/ethtool/common.c.
So fixes the comment.

Signed-off-by: Jian Shen 
Signed-off-by: David S. Miller

net: hsr: add offloading support

2021-02-11T21:24:44+00:00

Add support for offloading of HSR/PRP (IEC 62439-3) tag insertion
tag removal, duplicate generation and forwarding.

For HSR, insertion involves the switch adding a 6 byte HSR header after
the 14 byte Ethernet header. For PRP it adds a 6 byte trailer.

Tag removal involves automatically stripping the HSR/PRP header/trailer
in the switch. This is possible when the switch also performs auto
deduplication using the HSR/PRP header/trailer (making it no longer
required).

Forwarding involves automatically forwarding between redundant ports in
an HSR. This is crucial because delay is accumulated as a frame passes
through each node in the ring.

Duplication involves the switch automatically sending a single frame
from the CPU port to both redundant ports. This is required because the
inserted HSR/PRP header/trailer must contain the same sequence number
on the frames sent out both redundant ports.

Export is_hsr_master so DSA can tell them apart from other devices in
dsa_slave_changeupper.

Signed-off-by: George McCollister 
Reviewed-by: Vladimir Oltean 
Signed-off-by: David S. Miller

net: introduce a netdev feature for UDP GRO forwarding

2021-01-24T04:16:24+00:00

Introduce a new netdev feature, NETIF_F_GRO_UDP_FWD, to allow user
to turn UDP GRO on and off for forwarding.
Defaults to off to not change current datapath.

Suggested-by: Paolo Abeni 
Signed-off-by: Alexander Lobakin 
Signed-off-by: Jakub Kicinski