linux.git/net/core/net-sysfs.c, branch v4.12

net: use net->count to check whether a netns is alive or not

2017-03-13T23:02:27+00:00

The previous idea was to check whether a net namespace is in
net_exit_list or not. It doesn't work, because net->exit_list is used in
__register_pernet_operations and __unregister_pernet_operations where
all namespaces are added to a temporary list to make cleanup in a error
case, so list_empty(&net->exit_list) always returns false.

Reported-by: Mantas Mikulėnas 
Fixes: 002d8a1a6c11 ("net: skip genenerating uevents for network namespaces that are exiting")
Signed-off-by: Andrei Vagin 
Signed-off-by: David S. Miller

sched/headers: Prepare to move signal wakeup & sigpending methods from into

2017-03-02T07:42:32+00:00

Fix up affected files that include this signal functionality via sched.h.

Acked-by: Linus Torvalds 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

net: Add support for XPS with QoS via traffic classes

2016-10-31T19:00:48+00:00

This patch adds support for setting and using XPS when QoS via traffic
classes is enabled.  With this change we will factor in the priority and
traffic class mapping of the packet and use that information to correctly
select the queue.

This allows us to define a set of queues for a given traffic class via
mqprio and then configure the XPS mapping for those queues so that the
traffic flows can avoid head-of-line blocking between the individual CPUs
if so desired.

Signed-off-by: Alexander Duyck 
Signed-off-by: David S. Miller

net: Add sysfs value to determine queue traffic class

2016-10-31T19:00:47+00:00

Add a sysfs attribute for a Tx queue that allows us to determine the
traffic class for a given queue.  This will allow us to more easily
determine this in the future.  It is needed as XPS will take the traffic
class for a group of queues into account in order to avoid pulling traffic
from one traffic class into another.

Signed-off-by: Alexander Duyck 
Signed-off-by: David S. Miller

net: skip genenerating uevents for network namespaces that are exiting

2016-10-27T21:14:47+00:00

No one can see these events, because a network namespace can not be
destroyed, if it has sockets.

Unlike other devices, uevent-s for network devices are generated
only inside their network namespaces. They are filtered in
kobj_bcast_filter()

My experiments shows that net namespaces are destroyed more 30% faster
with this optimization.

Here is a perf output for destroying network namespaces without this
patch.

-   94.76%     0.02%  kworker/u48:1  [kernel.kallsyms]     [k] cleanup_net
   - 94.74% cleanup_net
      - 94.64% ops_exit_list.isra.4
         - 41.61% default_device_exit_batch
            - 41.47% unregister_netdevice_many
               - rollback_registered_many
                  - 40.36% netdev_unregister_kobject
                     - 14.55% device_del
                        + 13.71% kobject_uevent
                     - 13.04% netdev_queue_update_kobjects
                        + 12.96% kobject_put
                     - 12.72% net_rx_queue_update_kobjects
                          kobject_put
                        - kobject_release
                           + 12.69% kobject_uevent
                  + 0.80% call_netdevice_notifiers_info
         + 19.57% nfsd_exit_net
         + 11.15% tcp_net_metrics_exit
         + 8.25% rpcsec_gss_exit_net

It's very critical to optimize the exit path for network namespaces,
because they are destroyed under net_mutex and many namespaces can be
destroyed for one iteration.

v2: use dev_set_uevent_suppress()

Cc: Cong Wang 
Cc: "David S. Miller" 
Cc: Eric W. Biederman 
Signed-off-by: Andrei Vagin 
Signed-off-by: David S. Miller

net: introduce NETDEV_CHANGE_TX_QUEUE_LEN

2016-07-01T09:32:17+00:00

This patch introduces a new event - NETDEV_CHANGE_TX_QUEUE_LEN, this
will be triggered when tx_queue_len. It could be used by net device
who want to do some processing at that time. An example is tun who may
want to resize tx array when tx_queue_len is changed.

Cc: John Fastabend 
Signed-off-by: Jason Wang 
Acked-by: John Fastabend 
Signed-off-by: David S. Miller

net-sysfs: fix missing

2016-06-08T07:37:58+00:00

The of_find_net_device_by_node() function is defined in
 but not included in the .c file that
implements it. Fix the following warning by including the
header:

net/core/net-sysfs.c:1494:19: warning: symbol 'of_find_net_device_by_node' was not declared. Should it be static?

Signed-off-by: Ben Dooks 
Signed-off-by: David S. Miller

net: core: use __ethtool_get_ksettings

2016-02-26T03:06:47+00:00

Signed-off-by: David Decotigny 
Signed-off-by: David S. Miller

net-sysfs: remove unused fmt_long_hex

2016-02-18T15:01:15+00:00

Ever since commit 04ed3e741d0f133e02bed7fa5c98edba128f90e7
("net: change netdev->features to u32") the format string
fmt_long_hex has not been used, so we may as well remove it.

Signed-off-by: Colin Ian King 
Signed-off-by: David S. Miller

net: add rx_nohandler stat counter

2016-02-06T07:59:51+00:00

This adds an rx_nohandler stat counter, along with a sysfs statistics
node, and copies the counter out via netlink as well.

CC: "David S. Miller" 
CC: Eric Dumazet 
CC: Jiri Pirko 
CC: Daniel Borkmann 
CC: Tom Herbert 
CC: Jay Vosburgh 
CC: Veaceslav Falico 
CC: Andy Gospodarek 
CC: netdev@vger.kernel.org
Signed-off-by: Jarod Wilson 
Signed-off-by: David S. Miller