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* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2019-03-271-7/+13
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| * net-sysfs: Fix memory leak in netdev_register_kobjectWang Hai2019-03-211-5/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When registering struct net_device, it will call register_netdevice -> netdev_register_kobject -> device_initialize(dev); dev_set_name(dev, "%s", ndev->name) device_add(dev) register_queue_kobjects(ndev) In netdev_register_kobject(), if device_add(dev) or register_queue_kobjects(ndev) failed. Register_netdevice() will return error, causing netdev_freemem(ndev) to be called to free net_device, however put_device(&dev->dev)->..-> kobject_cleanup() won't be called, resulting in a memory leak. syzkaller report this: BUG: memory leak unreferenced object 0xffff8881f4fad168 (size 8): comm "syz-executor.0", pid 3575, jiffies 4294778002 (age 20.134s) hex dump (first 8 bytes): 77 70 61 6e 30 00 ff ff wpan0... backtrace: [<000000006d2d91d7>] kstrdup_const+0x3d/0x50 mm/util.c:73 [<00000000ba9ff953>] kvasprintf_const+0x112/0x170 lib/kasprintf.c:48 [<000000005555ec09>] kobject_set_name_vargs+0x55/0x130 lib/kobject.c:281 [<0000000098d28ec3>] dev_set_name+0xbb/0xf0 drivers/base/core.c:1915 [<00000000b7553017>] netdev_register_kobject+0xc0/0x410 net/core/net-sysfs.c:1727 [<00000000c826a797>] register_netdevice+0xa51/0xeb0 net/core/dev.c:8711 [<00000000857bfcfd>] cfg802154_update_iface_num.isra.2+0x13/0x90 [ieee802154] [<000000003126e453>] ieee802154_llsec_fill_key_id+0x1d5/0x570 [ieee802154] [<00000000e4b3df51>] 0xffffffffc1500e0e [<00000000b4319776>] platform_drv_probe+0xc6/0x180 drivers/base/platform.c:614 [<0000000037669347>] really_probe+0x491/0x7c0 drivers/base/dd.c:509 [<000000008fed8862>] driver_probe_device+0xdc/0x240 drivers/base/dd.c:671 [<00000000baf52041>] device_driver_attach+0xf2/0x130 drivers/base/dd.c:945 [<00000000c7cc8dec>] __driver_attach+0x10e/0x210 drivers/base/dd.c:1022 [<0000000057a757c2>] bus_for_each_dev+0x154/0x1e0 drivers/base/bus.c:304 [<000000005f5ae04b>] bus_add_driver+0x427/0x5e0 drivers/base/bus.c:645 Reported-by: Hulk Robot <hulkci@huawei.com> Fixes: 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array") Signed-off-by: Wang Hai <wanghai26@huawei.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
| * net-sysfs: call dev_hold if kobject_init_and_add successYueHaibing2019-03-191-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In netdev_queue_add_kobject and rx_queue_add_kobject, if sysfs_create_group failed, kobject_put will call netdev_queue_release to decrease dev refcont, however dev_hold has not be called. So we will see this while unregistering dev: unregister_netdevice: waiting for bcsh0 to become free. Usage count = -1 Reported-by: Hulk Robot <hulkci@huawei.com> Fixes: d0d668371679 ("net: don't decrement kobj reference count on init failure") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: convert rps_needed and rfs_needed to new static branch apiEric Dumazet2019-03-231-2/+2
|/ | | | | | | | | We prefer static_branch_unlikely() over static_key_false() these days. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2019-03-041-0/+3
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| * net-sysfs: Fix mem leak in netdev_register_kobjectYueHaibing2019-03-031-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | syzkaller report this: BUG: memory leak unreferenced object 0xffff88837a71a500 (size 256): comm "syz-executor.2", pid 9770, jiffies 4297825125 (age 17.843s) hex dump (first 32 bytes): 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N.......... ff ff ff ff ff ff ff ff 20 c0 ef 86 ff ff ff ff ........ ....... backtrace: [<00000000db12624b>] netdev_register_kobject+0x124/0x2e0 net/core/net-sysfs.c:1751 [<00000000dc49a994>] register_netdevice+0xcc1/0x1270 net/core/dev.c:8516 [<00000000e5f3fea0>] tun_set_iff drivers/net/tun.c:2649 [inline] [<00000000e5f3fea0>] __tun_chr_ioctl+0x2218/0x3d20 drivers/net/tun.c:2883 [<000000001b8ac127>] vfs_ioctl fs/ioctl.c:46 [inline] [<000000001b8ac127>] do_vfs_ioctl+0x1a5/0x10e0 fs/ioctl.c:690 [<0000000079b269f8>] ksys_ioctl+0x89/0xa0 fs/ioctl.c:705 [<00000000de649beb>] __do_sys_ioctl fs/ioctl.c:712 [inline] [<00000000de649beb>] __se_sys_ioctl fs/ioctl.c:710 [inline] [<00000000de649beb>] __x64_sys_ioctl+0x74/0xb0 fs/ioctl.c:710 [<000000007ebded1e>] do_syscall_64+0xc8/0x580 arch/x86/entry/common.c:290 [<00000000db315d36>] entry_SYSCALL_64_after_hwframe+0x49/0xbe [<00000000115be9bb>] 0xffffffffffffffff It should call kset_unregister to free 'dev->queues_kset' in error path of register_queue_kobjects, otherwise will cause a mem leak. Reported-by: Hulk Robot <hulkci@huawei.com> Fixes: 1d24eb4815d1 ("xps: Transmit Packet Steering") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net-sysfs: Switch to bitmap_zalloc()Andy Shevchenko2019-03-041-7/+5
| | | | | | | | | | | | | | | | Switch to bitmap_zalloc() to show clearly what we are allocating. Besides that it returns pointer of bitmap type instead of opaque void *. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: Get rid of SWITCHDEV_ATTR_ID_PORT_PARENT_IDFlorian Fainelli2019-02-061-15/+4
| | | | | | | | | | | | | | | | | | | | | | Now that we have a dedicated NDO for getting a port's parent ID, get rid of SWITCHDEV_ATTR_ID_PORT_PARENT_ID and convert all callers to use the NDO exclusively. This is a preliminary change to getting rid of switchdev_ops eventually. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: Introduce ndo_get_port_parent_id()Florian Fainelli2019-02-061-1/+6
|/ | | | | | | | | | | | | | | | | | | | | | | In preparation for getting rid of switchdev_ops, create a dedicated NDO operation for getting the port's parent identifier. There are essentially two classes of drivers that need to implement getting the port's parent ID which are VF/PF drivers with a built-in switch, and pure switchdev drivers such as mlxsw, ocelot, dsa etc. We introduce a helper function: dev_get_port_parent_id() which supports recursion into the lower devices to obtain the first port's parent ID. Convert the bridge, core and ipv4 multicast routing code to check for such ndo_get_port_parent_id() and call the helper function when valid before falling back to switchdev_port_attr_get(). This will allow us to convert all relevant drivers in one go instead of having to implement both switchdev_port_attr_get() and ndo_get_port_parent_id() operations, then get rid of switchdev_port_attr_get(). Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: core: dev: Add extack argument to dev_change_flags()Petr Machata2018-12-061-1/+1
| | | | | | | | | | | | | | | | | | | | 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_change_flags(). Therefore extend dev_change_flags() with and extra extack argument and update all users. Most of the calls end up just encoding NULL, but several sites (VLAN, ipvlan, VRF, rtnetlink) do have extack available. Since the function declaration line is changed anyway, name the other function arguments to placate checkpatch. Signed-off-by: Petr Machata <petrm@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Reviewed-by: Ido Schimmel <idosch@mellanox.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: allow to call netif_reset_xps_queues() under cpus_read_lockAndrei Vagin2018-08-091-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The definition of static_key_slow_inc() has cpus_read_lock in place. In the virtio_net driver, XPS queues are initialized after setting the queue:cpu affinity in virtnet_set_affinity() which is already protected within cpus_read_lock. Lockdep prints a warning when we are trying to acquire cpus_read_lock when it is already held. This patch adds an ability to call __netif_set_xps_queue under cpus_read_lock(). Acked-by: Jason Wang <jasowang@redhat.com> ============================================ WARNING: possible recursive locking detected 4.18.0-rc3-next-20180703+ #1 Not tainted -------------------------------------------- swapper/0/1 is trying to acquire lock: 00000000cf973d46 (cpu_hotplug_lock.rw_sem){++++}, at: static_key_slow_inc+0xe/0x20 but task is already holding lock: 00000000cf973d46 (cpu_hotplug_lock.rw_sem){++++}, at: init_vqs+0x513/0x5a0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(cpu_hotplug_lock.rw_sem); lock(cpu_hotplug_lock.rw_sem); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by swapper/0/1: #0: 00000000244bc7da (&dev->mutex){....}, at: __driver_attach+0x5a/0x110 #1: 00000000cf973d46 (cpu_hotplug_lock.rw_sem){++++}, at: init_vqs+0x513/0x5a0 #2: 000000005cd8463f (xps_map_mutex){+.+.}, at: __netif_set_xps_queue+0x8d/0xc60 v2: move cpus_read_lock() out of __netif_set_xps_queue() Cc: "Nambiar, Amritha" <amritha.nambiar@intel.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Fixes: 8af2c06ff4b1 ("net-sysfs: Add interface for Rx queue(s) map per Tx queue") Signed-off-by: Andrei Vagin <avagin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: create reusable function for getting ownership info of sysfs inodesTyler Hicks2018-07-201-18/+0
| | | | | | | | | | | | | Make net_ns_get_ownership() reusable by networking code outside of core. This is useful, for example, to allow bridge related sysfs files to be owned by container root. Add a function comment since this is a potentially dangerous function to use given the way that kobject_get_ownership() works by initializing uid and gid before calling .get_ownership(). Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net-sysfs: make sure objects belong to container's ownerDmitry Torokhov2018-07-201-1/+46
| | | | | | | | | | | When creating various objects in /sys/class/net/... make sure that they belong to container's owner instead of global root (if they belong to a container/namespace). Co-Developed-by: Tyler Hicks <tyhicks@canonical.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net-sysfs: require net admin in the init ns for setting tx_maxrateTyler Hicks2018-07-201-0/+3
| | | | | | | | | | | An upcoming change will allow container root to open some /sys/class/net files for writing. The tx_maxrate attribute can result in changes to actual hardware devices so err on the side of caution by requiring CAP_NET_ADMIN in the init namespace in the corresponding attribute store operation. Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: Add support for subordinate device traffic classesAlexander Duyck2018-07-091-1/+20
| | | | | | | | | | | | | | | | | | | | | | | | This patch is meant to provide the basic tools needed to allow us to create subordinate device traffic classes. The general idea here is to allow subdividing the queues of a device into queue groups accessible through an upper device such as a macvlan. The idea here is to enforce the idea that an upper device has to be a single queue device, ideally with IFF_NO_QUQUE set. With that being the case we can pretty much guarantee that the tc_to_txq mappings and XPS maps for the upper device are unused. As such we could reuse those in order to support subdividing the lower device and distributing those queues between the subordinate devices. In order to distinguish between a regular set of traffic classes and if a device is carrying subordinate traffic classes I changed num_tc from a u8 to a s16 value and use the negative values to represent the subordinate pool values. So starting at -1 and running to -32768 we can encode those as pool values, and the existing values of 0 to 15 can be maintained. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
* net-sysfs: Drop support for XPS and traffic_class on single queue deviceAlexander Duyck2018-07-091-2/+13
| | | | | | | | | | | | This patch makes it so that we do not report the traffic class or allow XPS configuration on single queue devices. This is mostly to avoid unnecessary complexity with changes I have planned that will allow us to reuse the unused tc_to_txq and XPS configuration on a single queue device to allow it to make use of a subset of queues on an underlying device. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
* net-sysfs: Add interface for Rx queue(s) map per Tx queueAmritha Nambiar2018-07-021-0/+83
| | | | | | | | | | | Extend transmit queue sysfs attribute to configure Rx queue(s) map per Tx queue. By default no receive queues are configured for the Tx queue. - /sys/class/net/eth0/queues/tx-*/xps_rxqs Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: Refactor XPS for CPUs and Rx queuesAmritha Nambiar2018-07-021-2/+2
| | | | | | | | Refactor XPS code to support Tx queue selection based on CPU(s) map or Rx queue(s) map. Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net-sysfs: Fix memory leak in XPS configurationAlexander Duyck2018-05-311-3/+3
| | | | | | | | | | This patch reorders the error cases in showing the XPS configuration so that we hold off on memory allocation until after we have verified that we can support XPS on a given ring. Fixes: 184c449f91fe ("net: Add support for XPS with QoS via traffic classes") Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: Use octal not symbolic permissionsJoe Perches2018-03-261-6/+6
| | | | | | | | | | | | | | Prefer the direct use of octal for permissions. Done with checkpatch -f --types=SYMBOLIC_PERMS --fix-inplace and some typing. Miscellanea: o Whitespace neatening around these conversions. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: introduce helper dev_change_tx_queue_len()Cong Wang2018-01-291-24/+1
| | | | | | | | | | | | | | This patch promotes the local change_tx_queue_len() to a core helper function, dev_change_tx_queue_len(), so that rtnetlink and net-sysfs could share the code. This also prepares for the following patch. Note, the -EFAULT in the original code doesn't make sense, we should propagate the errno from notifiers. Cc: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: core: Expose number of link up/down transitionsDavid Decotigny2018-01-221-1/+24
| | | | | | | | | | | | | | | | Expose the number of times the link has been going UP or DOWN, and update the "carrier_changes" counter to be the sum of these two events. While at it, also update the sysfs-class-net documentation to cover: carrier_changes (3.15), carrier_up_count (4.16) and carrier_down_count (4.16) Signed-off-by: David Decotigny <decot@googlers.com> [Florian: * rebase * add documentation * merge carrier_changes with up/down counters] Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: Convert atomic_t net::count to refcount_tKirill Tkhai2018-01-151-3/+3
| | | | | | | | | | | | | | | | | | Since net could be obtained from RCU lists, and there is a race with net destruction, the patch converts net::count to refcount_t. This provides sanity checks for the cases of incrementing counter of already dead net, when maybe_get_net() has to used instead of get_net(). Drivers: allyesconfig and allmodconfig are OK. Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net-sysfs: trigger netlink notification on ifalias change via sysfsRoopa Prabhu2017-11-141-3/+14
| | | | | | | | | | | This patch adds netlink notifications on iflias changes via sysfs. makes it consistent with the netlink path which also calls netdev_state_change. Also makes it consistent with other sysfs netdev_store operations. Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: core: decouple ifalias get/set from rtnl lockFlorian Westphal2017-10-031-9/+8
| | | | | | | | | | | | | | | Device alias can be set by either rtnetlink (rtnl is held) or sysfs. rtnetlink hold the rtnl mutex, sysfs acquires it for this purpose. Add an extra mutex for it and use rcu to protect concurrent accesses. This allows the sysfs path to not take rtnl and would later allow to not hold it when dumping ifalias. Based on suggestion from Eric Dumazet. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: style cleanupsstephen hemminger2017-08-181-32/+36
| | | | | | | Make code closer to current style. Mostly whitespace changes. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: mark receive queue attributes ro_after_initstephen hemminger2017-08-181-12/+13
| | | | | Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: make queue attributes ro_after_initstephen hemminger2017-08-181-21/+19
| | | | | | | | The XPS queue attributes can be ro_after_init. Also use __ATTR_RX macros to simplify initialization. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: make BQL sysfs attributes ro_after_initstephen hemminger2017-08-181-11/+11
| | | | | | | Also fix macro to not have ; at end. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: drop unused attribute argument from sysfs queue funcsstephen hemminger2017-08-181-26/+11
| | | | | | | The show and store functions don't need/use the attribute. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: make net sysfs attributes ro_after_initstephen hemminger2017-08-181-2/+2
| | | | | | | | | | | The attributes of net devices are immutable. Ideally, attribute groups would contain const attributes but there are too many places that do modifications of list during startup (in other code) to allow that. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: constify net_ns_type_operationsstephen hemminger2017-08-181-1/+1
| | | | | | | This can be const. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: make net_class ro_after_initstephen hemminger2017-08-181-1/+1
| | | | | | | The net_class in sysfs is only modified on init. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: constify netdev_class_filestephen hemminger2017-08-181-2/+2
| | | | | | | | These functions are wrapper arount class_create_file which can take a const attribute. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: don't decrement kobj reference count on init failurestephen hemminger2017-08-181-12/+10
| | | | | | | | | | If kobject_init_and_add failed, then the failure path would decrement the reference count of the queue kobject whose reference count was already zero. Fixes: 114cf5802165 ("bql: Byte queue limits") Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: convert net.passive from atomic_t to refcount_tReshetova, Elena2017-07-011-1/+1
| | | | | | | | | | | | | | refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: constify attribute_group structures.Arvind Yadav2017-06-291-3/+3
| | | | | | | | | | | | | | | | | attribute_groups are not supposed to change at runtime. All functions working with attribute_groups provided by <linux/device.h> work with const attribute_group. So mark the non-const structs as const. File size before: text data bss dec hex filename 9968 3168 16 13152 3360 net/core/net-sysfs.o File size After adding 'const': text data bss dec hex filename 10160 2976 16 13152 3360 net/core/net-sysfs.o Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: make struct net_device::tx_queue_len unsigned intAlexey Dobriyan2017-05-181-2/+6
| | | | | | | | | | | | | | | | | | | | | | | | 4 billion packet queue is something unthinkable so use 32-bit value for now. Space savings on x86_64: add/remove: 0/0 grow/shrink: 3/70 up/down: 16/-131 (-115) function old new delta change_tx_queue_len 94 108 +14 qdisc_create 1176 1177 +1 alloc_netdev_mqs 1124 1125 +1 xenvif_alloc 533 532 -1 x25_asy_setup 167 166 -1 ... tun_queue_resize 945 940 -5 pfifo_fast_enqueue 167 162 -5 qfq_init_qdisc 168 158 -10 tap_queue_resize 810 799 -11 transmit 719 698 -21 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: use net->count to check whether a netns is alive or notAndrey Vagin2017-03-131-3/+3
| | | | | | | | | | | | | 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 <grawity@gmail.com> Fixes: 002d8a1a6c11 ("net: skip genenerating uevents for network namespaces that are exiting") Signed-off-by: Andrei Vagin <avagin@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* sched/headers: Prepare to move signal wakeup & sigpending methods from ↵Ingo Molnar2017-03-021-0/+1
| | | | | | | | | | | | | <linux/sched.h> into <linux/sched/signal.h> Fix up affected files that include this signal functionality via sched.h. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* net: Add support for XPS with QoS via traffic classesAlexander Duyck2016-10-311-11/+20
| | | | | | | | | | | | | | | 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 <alexander.h.duyck@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: Add sysfs value to determine queue traffic classAlexander Duyck2016-10-311-1/+19
| | | | | | | | | | | 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 <alexander.h.duyck@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: skip genenerating uevents for network namespaces that are exitingAndrey Vagin2016-10-271-3/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 <xiyou.wangcong@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrei Vagin <avagin@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: introduce NETDEV_CHANGE_TX_QUEUE_LENJason Wang2016-07-011-1/+14
| | | | | | | | | | | | 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 <john.r.fastabend@intel.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net-sysfs: fix missing <linux/of_net.h>Ben Dooks2016-06-081-0/+1
| | | | | | | | | | | | The of_find_net_device_by_node() function is defined in <linux/of_net.h> 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 <ben.dooks@codethink.co.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: core: use __ethtool_get_ksettingsDavid Decotigny2016-02-251-6/+9
| | | | | Signed-off-by: David Decotigny <decot@googlers.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net-sysfs: remove unused fmt_long_hexColin Ian King2016-02-181-1/+0
| | | | | | | | | 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 <colin.king@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: add rx_nohandler stat counterJarod Wilson2016-02-061-0/+2
| | | | | | | | | | | | | | | | | 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" <davem@davemloft.net> CC: Eric Dumazet <edumazet@google.com> CC: Jiri Pirko <jiri@mellanox.com> CC: Daniel Borkmann <daniel@iogearbox.net> CC: Tom Herbert <tom@herbertland.com> CC: Jay Vosburgh <j.vosburgh@gmail.com> CC: Veaceslav Falico <vfalico@gmail.com> CC: Andy Gospodarek <gospo@cumulusnetworks.com> CC: netdev@vger.kernel.org Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net-sysfs: use to_net_dev in net_namespace()Geliang Tang2015-12-221-2/+2
| | | | | | | Use to_net_dev() instead of open-coding it. Signed-off-by: Geliang Tang <geliangtang@163.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* switchdev: Pass original device to port netdev driverIdo Schimmel2015-12-151-0/+1
| | | | | | | | | | | | | | | | | | | | switchdev drivers need to know the netdev on which the switchdev op was invoked. For example, the STP state of a VLAN interface configured on top of a port can change while being member in a bridge. In this case, the underlying driver should only change the STP state of that particular VLAN and not of all the VLANs configured on the port. However, current switchdev infrastructure only passes the port netdev down to the driver. Solve that by passing the original device down to the driver as part of the required switchdev object / attribute. This doesn't entail any change in current switchdev drivers. It simply enables those supporting stacked devices to know the originating device and act accordingly. Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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