kernel/linux.git/drivers/net/netdevsim/netdevsim.h, branch v7.3-rc1

netdevsim: drop the ability to change max_vfs via debugfs

2026-08-14T00:38:05+00:00

This debugfs file isn't used by kernel's selftests, so drop it. Reported-by: syzbot+3147c5de186107ffc7a1@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3147c5de186107ffc7a1 Suggested-by: Jakub Kicinski Signed-off-by: Slawomir Stepien Link: https://patch.msgid.link/20260810085717.570382-1-sst@poczta.fm Signed-off-by: Jakub Kicinski

netdevsim: remove ethtool debugfs files before freeing netdev

2026-06-30T01:47:23+00:00

The ethtool debugfs files point directly into struct netdevsim, which is allocated as net_device private data. Their containing port directory is removed only after nsim_destroy() calls free_netdev(). An open simple-attribute file can consequently dereference the freed private data before the directory is removed. KASAN observed this in debugfs_u32_get() during network namespace teardown. Track and remove the ethtool subtree before free_netdev() on both the normal and registration-failure paths. debugfs removal drains active file users before returning. Fixes: ff1f7c17fb20 ("netdevsim: add pause frame stats") Reported-by: syzbot+6c25f4750230faf70be9@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=6c25f4750230faf70be9 Cc: # netdevsim is a test harness, it's never loaded on production systems Signed-off-by: Yousef Alhouseen Link: https://patch.msgid.link/20260628002804.24214-1-alhouseenyousef@gmail.com Signed-off-by: Jakub Kicinski

netdevsim: psp: use atomic64 for psp stats counters

2026-06-02T19:57:46+00:00

The existing u64_stats_t-based psp counters had two preexisting api usage bugs: u64_stats_init() was never called on the syncp object, and the writer side of the u64_stats_update_begin()/end() api was not serialized. Switch the counters to atomic64_t instead. Atomics need no initialization and are inherently safe against concurrent writers, eliminating both bugs at once. Use atomic64_t rather than atomic_long_t so byte counters don't wrap at 4 GiB on 32-bit builds. Fixes: 178f0763c5f3 ("netdevsim: implement psp device stats") Cc: # netdevsim is a test harness, it's never loaded on production systems Signed-off-by: Daniel Zahka Link: https://patch.msgid.link/20260529-fix-psp-stats-v2-2-3a194eacf18e@gmail.com Signed-off-by: Jakub Kicinski

netdevsim: psp: rcu protect psp_dev reference

2026-05-07T00:39:20+00:00

There are two issues with the way psp_dev is used in nsim_do_psp(): 1. There is no check for IS_ERR() on the peers psp_dev, before dereferencing. 2. The refcount on this psp_dev can be dropped by nsim_psp_rereg_write() To fix this, we can make netdevsim's reference to its psp_dev an rcu reference, and then nsim_do_psp() can read the fields it needs from an rcu critical section. Fixes: f857478d6206 ("netdevsim: a basic test PSP implementation") Signed-off-by: Daniel Zahka Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260505-psd-rcu-v1-3-a8f69ec1ab96@gmail.com Signed-off-by: Jakub Kicinski

netdevsim: psp: serialize calls to nsim_psp_uninit()

2026-05-07T00:39:20+00:00

The debugfs write handler, nsim_psp_rereg_write(), can race against nsim_destroy() and against itself, causing nsim_psp_uninit() to run more than once concurrently. Two complementary changes serialize all callers: 1. Delete the psp_rereg debugfs file from nsim_psp_uninit() before doing the actual teardown. debugfs_remove() drains any in-flight writers and prevents new ones from starting. 2. Add a mutex around the body of nsim_psp_rereg_write() so that two concurrent userspace writers cannot both enter the teardown path at once. The teardown work itself is moved into a new __nsim_psp_uninit() that the rereg handler calls under the mutex, while the public nsim_psp_uninit() wraps it with the debugfs_remove()/mutex_destroy() pair so nsim_destroy() doesn't have to know about the psp internals. Fixes: f857478d6206 ("netdevsim: a basic test PSP implementation") Signed-off-by: Daniel Zahka Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20260505-psd-rcu-v1-2-a8f69ec1ab96@gmail.com Signed-off-by: Jakub Kicinski

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2026-04-14T19:04:00+00:00

Merge in late fixes in preparation for the net-next PR. Conflicts: include/net/sch_generic.h a6bd339dbb351 ("net_sched: fix skb memory leak in deferred qdisc drops") ff2998f29f390 ("net: sched: introduce qdisc-specific drop reason tracing") https://lore.kernel.org/adz0iX85FHMz0HdO@sirena.org.uk drivers/net/ethernet/airoha/airoha_eth.c 1acdfbdb516b ("net: airoha: Fix VIP configuration for AN7583 SoC") bf3471e6e6c0 ("net: airoha: Make flow control source port mapping dependent on nbq parameter") Adjacent changes: drivers/net/ethernet/airoha/airoha_ppe.c f44218cd5e6a ("net: airoha: Reset PPE cpu port configuration in airoha_ppe_hw_init()") 7da62262ec96 ("inet: add ip_local_port_step_width sysctl to improve port usage distribution") Signed-off-by: Jakub Kicinski

nsim: Add support for VLAN filters

2026-04-10T02:38:42+00:00

Add support for storing the list of VLANs in nsim devices, together with ops for adding/removing them and a debug file to show them. This will be used in upcoming tests. Signed-off-by: Cosmin Ratiu Reviewed-by: Sabrina Dubroca Link: https://patch.msgid.link/20260408115240.1636047-3-cratiu@nvidia.com Signed-off-by: Jakub Kicinski

netdevsim: Add devlink port resource registration

2026-04-09T02:55:38+00:00

Register port-level resources for netdevsim ports to enable testing of the port resource infrastructure. Signed-off-by: Or Har-Toov Reviewed-by: Shay Drori Reviewed-by: Moshe Shemesh Reviewed-by: Jiri Pirko Signed-off-by: Tariq Toukan Link: https://patch.msgid.link/20260407194107.148063-5-tariqt@nvidia.com Signed-off-by: Jakub Kicinski

netdevsim: move TC offload code to a dedicated file

2026-03-21T03:13:14+00:00

This commit has no functional change. Reviewed-by: Jamal Hadi Salim Signed-off-by: Davide Caratti Link: https://patch.msgid.link/b7881fd53f8a5d8eff4eae8121576c3cd60c2ed7.1773945414.git.dcaratti@redhat.com Signed-off-by: Jakub Kicinski

netdevsim: use u64_stats_t with u64_stats_sync properly

2026-01-27T03:53:36+00:00

On 64bit arches, struct u64_stats_sync is empty and provides no help against load/store tearing. Convert to u64_stats_t to ensure atomic operations. Signed-off-by: David Yang Link: https://patch.msgid.link/20260123211101.2929547-1-mmyangfl@gmail.com Signed-off-by: Jakub Kicinski