net: rename netns_local to netns_immutable

The name 'netns_local' is confusing. A following commit will export it via
netlink, so let's use a more explicit name.

Reported-by: Eric Dumazet <edumazet

net: rename netns_local to netns_immutable

The name 'netns_local' is confusing. A following commit will export it via
netlink, so let's use a more explicit name.

Reported-by: Eric Dumazet <[email protected]>
Suggested-by: Kuniyuki Iwashima <[email protected]>
Signed-off-by: Nicolas Dichtel <[email protected]>
Reviewed-by: Kuniyuki Iwashima <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

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netdev_features: convert NETIF_F_NETNS_LOCAL to dev->netns_local

"Interface can't change network namespaces" is rather an attribute,
not a feature, and it can't be changed via Ethtool.
Make it a "co

netdev_features: convert NETIF_F_NETNS_LOCAL to dev->netns_local

"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 <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

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netdev_features: convert NETIF_F_LLTX to dev->lltx

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_featur

netdev_features: convert NETIF_F_LLTX to dev->lltx

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 <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>

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net: annotate writes on dev->mtu from ndo_change_mtu()

Simon reported that ndo_change_mtu() methods were never
updated to use WRITE_ONCE(dev->mtu, new_mtu) as hinted
in commit 501a90c94510 ("inet: p

net: annotate writes on dev->mtu from ndo_change_mtu()

Simon reported that ndo_change_mtu() methods were never
updated to use WRITE_ONCE(dev->mtu, new_mtu) as hinted
in commit 501a90c94510 ("inet: protect against too small
mtu values.")

We read dev->mtu without holding RTNL in many places,
with READ_ONCE() annotations.

It is time to take care of ndo_change_mtu() methods
to use corresponding WRITE_ONCE()

Signed-off-by: Eric Dumazet <[email protected]>
Reported-by: Simon Horman <[email protected]>
Closes: https://lore.kernel.org/netdev/[email protected]/
Reviewed-by: Jacob Keller <[email protected]>
Reviewed-by: Sabrina Dubroca <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Acked-by: Shannon Nelson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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net/net_failover: fix txq exceeding warning

The failover txq is inited as 16 queues.
when a packet is transmitted from the failover device firstly,
the failover device will select the queue which is

net/net_failover: fix txq exceeding warning

The failover txq is inited as 16 queues.
when a packet is transmitted from the failover device firstly,
the failover device will select the queue which is returned from
the primary device if the primary device is UP and running.
If the primary device txq is bigger than the default 16,
it can lead to the following warning:
eth0 selects TX queue 18, but real number of TX queues is 16

The warning backtrace is:
[ 32.146376] CPU: 18 PID: 9134 Comm: chronyd Tainted: G E 6.2.8-1.el7.centos.x86_64 #1
[ 32.147175] Hardware name: Red Hat KVM, BIOS 1.10.2-3.el7_4.1 04/01/2014
[ 32.147730] Call Trace:
[ 32.147971] <TASK>
[ 32.148183] dump_stack_lvl+0x48/0x70
[ 32.148514] dump_stack+0x10/0x20
[ 32.148820] netdev_core_pick_tx+0xb1/0xe0
[ 32.149180] __dev_queue_xmit+0x529/0xcf0
[ 32.149533] ? __check_object_size.part.0+0x21c/0x2c0
[ 32.149967] ip_finish_output2+0x278/0x560
[ 32.150327] __ip_finish_output+0x1fe/0x2f0
[ 32.150690] ip_finish_output+0x2a/0xd0
[ 32.151032] ip_output+0x7a/0x110
[ 32.151337] ? __pfx_ip_finish_output+0x10/0x10
[ 32.151733] ip_local_out+0x5e/0x70
[ 32.152054] ip_send_skb+0x19/0x50
[ 32.152366] udp_send_skb.isra.0+0x163/0x3a0
[ 32.152736] udp_sendmsg+0xba8/0xec0
[ 32.153060] ? __folio_memcg_unlock+0x25/0x60
[ 32.153445] ? __pfx_ip_generic_getfrag+0x10/0x10
[ 32.153854] ? sock_has_perm+0x85/0xa0
[ 32.154190] inet_sendmsg+0x6d/0x80
[ 32.154508] ? inet_sendmsg+0x6d/0x80
[ 32.154838] sock_sendmsg+0x62/0x70
[ 32.155152] ____sys_sendmsg+0x134/0x290
[ 32.155499] ___sys_sendmsg+0x81/0xc0
[ 32.155828] ? _get_random_bytes.part.0+0x79/0x1a0
[ 32.156240] ? ip4_datagram_release_cb+0x5f/0x1e0
[ 32.156649] ? get_random_u16+0x69/0xf0
[ 32.156989] ? __fget_light+0xcf/0x110
[ 32.157326] __sys_sendmmsg+0xc4/0x210
[ 32.157657] ? __sys_connect+0xb7/0xe0
[ 32.157995] ? __audit_syscall_entry+0xce/0x140
[ 32.158388] ? syscall_trace_enter.isra.0+0x12c/0x1a0
[ 32.158820] __x64_sys_sendmmsg+0x24/0x30
[ 32.159171] do_syscall_64+0x38/0x90
[ 32.159493] entry_SYSCALL_64_after_hwframe+0x72/0xdc

Fix that by reducing txq number as the non-existent primary-dev does.

Fixes: cfc80d9a1163 ("net: Introduce net_failover driver")
Signed-off-by: Faicker Mo <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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net: move from strlcpy with unused retval to strscpy

Follow the advice of the below link and prefer 'strscpy' in this
subsystem. Conversion is 1:1 because the return value is not used.
Generated by

net: move from strlcpy with unused retval to strscpy

Follow the advice of the below link and prefer 'strscpy' in this
subsystem. Conversion is 1:1 because the return value is not used.
Generated by a coccinelle script.

Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/
Signed-off-by: Wolfram Sang <[email protected]>
Acked-by: Marc Kleine-Budde <[email protected]> # for CAN
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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net: add per-cpu storage and net->core_stats

Before adding yet another possibly contended atomic_long_t,
it is time to add per-cpu storage for existing ones:
dev->tx_dropped, dev->rx_dropped, and d

net: add per-cpu storage and net->core_stats

Before adding yet another possibly contended atomic_long_t,
it is time to add per-cpu storage for existing ones:
dev->tx_dropped, dev->rx_dropped, and dev->rx_nohandler

Because many devices do not have to increment such counters,
allocate the per-cpu storage on demand, so that dev_get_stats()
does not have to spend considerable time folding zero counters.

Note that some drivers have abused these counters which
were supposed to be only used by core networking stack.

v4: should use per_cpu_ptr() in dev_get_stats() (Jakub)
v3: added a READ_ONCE() in netdev_core_stats_alloc() (Paolo)
v2: add a missing include (reported by kernel test robot <[email protected]>)
Change in netdev_core_stats_alloc() (Jakub)

Signed-off-by: Eric Dumazet <[email protected]>
Cc: jeffreyji <[email protected]>
Reviewed-by: Brian Vazquez <[email protected]>
Reviewed-by: Jakub Kicinski <[email protected]>
Acked-by: Paolo Abeni <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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net: use dev_addr_set()

Use dev_addr_set() instead of writing directly to netdev->dev_addr
in various misc and old drivers.

Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: David S. M

net: use dev_addr_set()

Use dev_addr_set() instead of writing directly to netdev->dev_addr
in various misc and old drivers.

Signed-off-by: Jakub Kicinski <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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net: net_failover: Correct parameter name 'standby_dev'

Fixes the following W=1 kernel build warning(s):

drivers/net/net_failover.c:711: warning: Function parameter or member 'standby_dev' not des

net: net_failover: Correct parameter name 'standby_dev'

Fixes the following W=1 kernel build warning(s):

drivers/net/net_failover.c:711: warning: Function parameter or member 'standby_dev' not described in 'net_failover_create'
drivers/net/net_failover.c:711: warning: Excess function parameter 'dev' description in 'net_failover_create'

Signed-off-by: Lee Jones <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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net_failover: fixed rollback in net_failover_open()

found by smatch:
drivers/net/net_failover.c:65 net_failover_open() error:
we previously assumed 'primary_dev' could be null (see line 43)

Fixes:

net_failover: fixed rollback in net_failover_open()

found by smatch:
drivers/net/net_failover.c:65 net_failover_open() error:
we previously assumed 'primary_dev' could be null (see line 43)

Fixes: cfc80d9a1163 ("net: Introduce net_failover driver")
Signed-off-by: Vasily Averin <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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net: remove 'fallback' argument from dev->ndo_select_queue()

After the previous patch, all the callers of ndo_select_queue()
provide as a 'fallback' argument netdev_pick_tx.
The only exceptions are

net: remove 'fallback' argument from dev->ndo_select_queue()

After the previous patch, all the callers of ndo_select_queue()
provide as a 'fallback' argument netdev_pick_tx.
The only exceptions are nested calls to ndo_select_queue(),
which pass down the 'fallback' available in the current scope
- still netdev_pick_tx.

We can drop such argument and replace fallback() invocation with
netdev_pick_tx(). This avoids an indirect call per xmit packet
in some scenarios (TCP syn, UDP unconnected, XDP generic, pktgen)
with device drivers implementing such ndo. It also clean the code
a bit.

Tested with ixgbe and CONFIG_FCOE=m

With pktgen using queue xmit:
threads vanilla patched
(kpps) (kpps)
1 2334 2428
2 4166 4278
4 7895 8100

v1 -> v2:
- rebased after helper's name change

Signed-off-by: Paolo Abeni <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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net: core: dev: Add extack argument to dev_open()

In order to pass extack together with NETDEV_PRE_UP notifications, it's
necessary to route the extack to __dev_open() from diverse (possibly
indirec

net: core: dev: Add extack argument to dev_open()

In order to pass extack together with NETDEV_PRE_UP notifications, it's
necessary to route the extack to __dev_open() from diverse (possibly
indirect) callers. One prominent API through which the notification is
invoked is dev_open().

Therefore extend dev_open() with and extra extack argument and update
all users. Most of the calls end up just encoding NULL, but bond and
team drivers have the extack readily available.

Signed-off-by: Petr Machata <[email protected]>
Acked-by: Jiri Pirko <[email protected]>
Reviewed-by: Ido Schimmel <[email protected]>
Reviewed-by: David Ahern <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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failover: Fix error return code in net_failover_create

if failover_register failed, 'err' code should be set correctly

Fixes: cfc80d9a1163 ("net: Introduce net_failover driver")
Signed-off-by: YueH

failover: Fix error return code in net_failover_create

if failover_register failed, 'err' code should be set correctly

Fixes: cfc80d9a1163 ("net: Introduce net_failover driver")
Signed-off-by: YueHaibing <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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failover: Add missing check to validate 'slave_dev' in net_failover_slave_unregister

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/net_failover.c: In function 'net_failover_slave_unreg

failover: Add missing check to validate 'slave_dev' in net_failover_slave_unregister

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/net_failover.c: In function 'net_failover_slave_unregister':
drivers/net/net_failover.c:598:35: warning:
variable 'primary_dev' set but not used [-Wunused-but-set-variable]

There should check the validity of 'slave_dev'.

Fixes: cfc80d9a1163 ("net: Introduce net_failover driver")

Signed-off-by: YueHaibing <[email protected]>
Acked-by: Sridhar Samudrala <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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net: remove duplicated include from net_failover.c

Remove duplicated include.

Signed-off-by: YueHaibing <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

failover: change mtu has RTNL

When changing MTU, RTNL is held so use rtnl_dereference
instead of rcu_dereference.

Signed-off-by: Stephen Hemminger <[email protected]>
Signed-off-by: David

failover: change mtu has RTNL

When changing MTU, RTNL is held so use rtnl_dereference
instead of rcu_dereference.

Signed-off-by: Stephen Hemminger <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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net: allow fallback function to pass netdev

For most of these calls we can just pass NULL through to the fallback
function as the sb_dev. The only cases where we cannot are the cases where
we might

net: allow fallback function to pass netdev

For most of these calls we can just pass NULL through to the fallback
function as the sb_dev. The only cases where we cannot are the cases where
we might be dealing with either an upper device or a driver that would
have configured things to support an sb_dev itself.

The only driver that has any significant change in this patch set should be
ixgbe as we can drop the redundant functionality that existed in both the
ndo_select_queue function and the fallback function that was passed through
to us.

Signed-off-by: Alexander Duyck <[email protected]>
Tested-by: Andrew Bowers <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>

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net: allow ndo_select_queue to pass netdev

This patch makes it so that instead of passing a void pointer as the
accel_priv we instead pass a net_device pointer as sb_dev. Making this
change allows u

net: allow ndo_select_queue to pass netdev

This patch makes it so that instead of passing a void pointer as the
accel_priv we instead pass a net_device pointer as sb_dev. Making this
change allows us to pass the subordinate device through to the fallback
function eventually so that we can keep the actual code in the
ndo_select_queue call as focused on possible on the exception cases.

Signed-off-by: Alexander Duyck <[email protected]>
Tested-by: Andrew Bowers <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>

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net: net_failover: fix typo in net_failover_slave_register()

Sync both unicast and multicast lists instead of unicast twice.

Fixes: cfc80d9a116 ("net: Introduce net_failover driver")
Reviewed-by: J

net: net_failover: fix typo in net_failover_slave_register()

Sync both unicast and multicast lists instead of unicast twice.

Fixes: cfc80d9a116 ("net: Introduce net_failover driver")
Reviewed-by: Joao Martins <[email protected]>
Signed-off-by: Liran Alon <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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net_failover: Use netdev_features_t instead of u32

The features mask needs to be a netdev_features_t (u64) because a u32
is not big enough.

Fixes: cfc80d9a1163 ("net: Introduce net_failover driver"

net_failover: Use netdev_features_t instead of u32

The features mask needs to be a netdev_features_t (u64) because a u32
is not big enough.

Fixes: cfc80d9a1163 ("net: Introduce net_failover driver")
Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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net: Introduce net_failover driver

The net_failover driver provides an automated failover mechanism via APIs
to create and destroy a failover master netdev and manages a primary and
standby slave ne

net: Introduce net_failover driver

The net_failover driver provides an automated failover mechanism via APIs
to create and destroy a failover master netdev and manages a primary and
standby slave netdevs that get registered via the generic failover
infrastructure.

The failover netdev acts a master device and controls 2 slave devices. The
original paravirtual interface gets registered as 'standby' slave netdev and
a passthru/vf device with the same MAC gets registered as 'primary' slave
netdev. Both 'standby' and 'failover' netdevs are associated with the same
'pci' device. The user accesses the network interface via 'failover' netdev.
The 'failover' netdev chooses 'primary' netdev as default for transmits when
it is available with link up and running.

This can be used by paravirtual drivers to enable an alternate low latency
datapath. It also enables hypervisor controlled live migration of a VM with
direct attached VF by failing over to the paravirtual datapath when the VF
is unplugged.

Signed-off-by: Sridhar Samudrala <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

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