linux-stable.git/drivers/net/netdevsim/netdev.c, branch linux-6.14.y Linux kernel stable tree netdevsim: allow normal queue reset while down 2025-05-29T09:13:36+00:00 Jakub Kicinski kuba@kernel.org 2025-02-06T22:56:38+00:00 a8f32bb6e51e395b88c350e64809204b823e16e8 [ Upstream commit 285b3f78eabd951e59e98f01f86abaaa6c76cd44 ] Resetting queues while the device is down should be legal. Allow it, test it. Ideally we'd test this with a real device supporting devmem but I don't have access to such devices. Reviewed-by: Mina Almasry <almasrymina@google.com> Link: https://patch.msgid.link/20250206225638.1387810-5-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit 285b3f78eabd951e59e98f01f86abaaa6c76cd44 ]

Resetting queues while the device is down should be legal.
Allow it, test it. Ideally we'd test this with a real device
supporting devmem but I don't have access to such devices.

Reviewed-by: Mina Almasry <almasrymina@google.com>
Link: https://patch.msgid.link/20250206225638.1387810-5-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
netdevsim: call napi_schedule from a timer context 2025-05-29T09:13:14+00:00 Breno Leitao leitao@debian.org 2025-02-19T16:41:20+00:00 4ce005ddaac08e92e917dca7af901ba11ec8a5f8 [ Upstream commit bf3624cf1c3708284c53ed99a1c43f2e104dc2dd ] The netdevsim driver was experiencing NOHZ tick-stop errors during packet transmission due to pending softirq work when calling napi_schedule(). This issue was observed when running the netconsole selftest, which triggered the following error message: NOHZ tick-stop error: local softirq work is pending, handler #08!!! To fix this issue, introduce a timer that schedules napi_schedule() from a timer context instead of calling it directly from the TX path. Create an hrtimer for each queue and kick it from the TX path, which then schedules napi_schedule() from the timer context. Suggested-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Breno Leitao <leitao@debian.org> Link: https://patch.msgid.link/20250219-netdevsim-v3-1-811e2b8abc4c@debian.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> 
[ Upstream commit bf3624cf1c3708284c53ed99a1c43f2e104dc2dd ]

The netdevsim driver was experiencing NOHZ tick-stop errors during packet
transmission due to pending softirq work when calling napi_schedule().
This issue was observed when running the netconsole selftest, which
triggered the following error message:

  NOHZ tick-stop error: local softirq work is pending, handler #08!!!

To fix this issue, introduce a timer that schedules napi_schedule()
from a timer context instead of calling it directly from the TX path.

Create an hrtimer for each queue and kick it from the TX path,
which then schedules napi_schedule() from the timer context.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://patch.msgid.link/20250219-netdevsim-v3-1-811e2b8abc4c@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
net: move HDS config from ethtool state 2025-01-20T19:44:57+00:00 Jakub Kicinski kuba@kernel.org 2025-01-19T02:05:11+00:00 3c836451ca9041cfb32a7d8f59ea15b3b991bbb3 Separate the HDS config from the ethtool state struct. The HDS config contains just simple parameters, not state. Having it as a separate struct will make it easier to clone / copy and also long term potentially make it per-queue. Reviewed-by: Michael Chan <michael.chan@broadcom.com> Link: https://patch.msgid.link/20250119020518.1962249-2-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org> 
Separate the HDS config from the ethtool state struct.
The HDS config contains just simple parameters, not state.
Having it as a separate struct will make it easier to clone / copy
and also long term potentially make it per-queue.

Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/20250119020518.1962249-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
netdevsim: add HDS feature 2025-01-15T22:42:12+00:00 Taehee Yoo ap420073@gmail.com 2025-01-14T14:28:51+00:00 f394d07b192b67a895dbed76253ce95dcbb5d17c HDS options(tcp-data-split, hds-thresh) have dependencies between other features like XDP. Basic dependencies are checked in the core API. netdevsim is very useful to check basic dependencies. The default tcp-data-split mode is UNKNOWN but netdevsim driver returns ENABLED when ethtool dumps tcp-data-split mode. The default value of HDS threshold is 0 and the maximum value is 1024. ethtool shows like this. ethtool -g eni1np1 Ring parameters for eni1np1: Pre-set maximums: ... HDS thresh: 1024 Current hardware settings: ... TCP data split: on HDS thresh: 0 ethtool -G eni1np1 tcp-data-split on hds-thresh 1024 ethtool -g eni1np1 Ring parameters for eni1np1: Pre-set maximums: ... HDS thresh: 1024 Current hardware settings: ... TCP data split: on HDS thresh: 1024 Signed-off-by: Taehee Yoo <ap420073@gmail.com> Link: https://patch.msgid.link/20250114142852.3364986-10-ap420073@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> 
HDS options(tcp-data-split, hds-thresh) have dependencies between other
features like XDP. Basic dependencies are checked in the core API.
netdevsim is very useful to check basic dependencies.

The default tcp-data-split mode is UNKNOWN but netdevsim driver
returns ENABLED when ethtool dumps tcp-data-split mode.
The default value of HDS threshold is 0 and the maximum value is 1024.

ethtool shows like this.

ethtool -g eni1np1
Ring parameters for eni1np1:
Pre-set maximums:
...
HDS thresh:             1024
Current hardware settings:
...
TCP data split:         on
HDS thresh:             0

ethtool -G eni1np1 tcp-data-split on hds-thresh 1024
ethtool -g eni1np1
Ring parameters for eni1np1:
Pre-set maximums:
...
HDS thresh:             1024
Current hardware settings:
...
TCP data split:         on
HDS thresh:             1024

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Link: https://patch.msgid.link/20250114142852.3364986-10-ap420073@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
netdevsim: add debugfs-triggered queue reset 2025-01-09T14:33:08+00:00 Jakub Kicinski kuba@kernel.org 2025-01-07T16:08:45+00:00 6917d207b469ee81e6dc7f8ccca29c234a16916d Support triggering queue reset via debugfs for an upcoming test. Reviewed-by: Willem de Bruijn <willemb@google.com> Acked-by: Stanislav Fomichev <sdf@fomichev.me> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Reviewed-by: Mina Almasry <almasrymina@google.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> 
Support triggering queue reset via debugfs for an upcoming test.

Reviewed-by: Willem de Bruijn <willemb@google.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
netdevsim: add queue management API support 2025-01-09T14:33:08+00:00 Jakub Kicinski kuba@kernel.org 2025-01-07T16:08:44+00:00 5bc8e8dbef27b73bd7b6d1fd5108b4fd4c6d469f Add queue management API support. We need a way to reset queues to test NAPI reordering, the queue management API provides a handy scaffolding for that. Reviewed-by: Willem de Bruijn <willemb@google.com> Acked-by: Stanislav Fomichev <sdf@fomichev.me> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Reviewed-by: Mina Almasry <almasrymina@google.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> 
Add queue management API support. We need a way to reset queues
to test NAPI reordering, the queue management API provides a
handy scaffolding for that.

Reviewed-by: Willem de Bruijn <willemb@google.com>
Acked-by: Stanislav Fomichev <sdf@fomichev.me>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
netdevsim: add queue alloc/free helpers 2025-01-09T14:33:08+00:00 Jakub Kicinski kuba@kernel.org 2025-01-07T16:08:43+00:00 a565dd04a120c03891b6fb504f342159b446f463 We'll need the code to allocate and free queues in the queue management API, factor it out. Reviewed-by: Willem de Bruijn <willemb@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com> 
We'll need the code to allocate and free queues in the queue management
API, factor it out.

Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
netdevsim: allocate rqs individually 2025-01-09T14:33:08+00:00 Jakub Kicinski kuba@kernel.org 2025-01-07T16:08:42+00:00 915c82f842f955429e347a53ce005604ad421343 Make nsim->rqs an array of pointers and allocate them individually so that we can swap them out one by one. Reviewed-by: Willem de Bruijn <willemb@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com> 
Make nsim->rqs an array of pointers and allocate them individually
so that we can swap them out one by one.

Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
netdevsim: support NAPI config 2025-01-09T14:33:08+00:00 Jakub Kicinski kuba@kernel.org 2025-01-07T16:08:41+00:00 00adf88b186fa09a0b4005bdcf440aa2f926a75b Link the NAPI instances to their configs. This will be needed to test that NAPI config doesn't break list ordering. Reviewed-by: Willem de Bruijn <willemb@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com> 
Link the NAPI instances to their configs. This will be needed to test
that NAPI config doesn't break list ordering.

Reviewed-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
net: netdevsim: fix nsim_pp_hold_write() 2024-12-18T01:46:17+00:00 Eric Dumazet edumazet@google.com 2024-12-16T08:37:03+00:00 b9b8301d369b4c876de5255dbf067b19ba88ac71 nsim_pp_hold_write() has two problems: 1) It may return with rtnl held, as found by syzbot. 2) Its return value does not propagate an error if any. Fixes: 1580cbcbfe77 ("net: netdevsim: add some fake page pool use") Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/20241216083703.1859921-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> 
nsim_pp_hold_write() has two problems:

1) It may return with rtnl held, as found by syzbot.

2) Its return value does not propagate an error if any.

Fixes: 1580cbcbfe77 ("net: netdevsim: add some fake page pool use")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241216083703.1859921-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>