linux-toradex.git/drivers/net/netdevsim, branch v6.17-rc1

netdevsim: access ->pp through netmem_desc instead of page

2025-07-24T00:46:54+00:00

To eliminate the use of struct page in page pool, the page pool users
should use netmem descriptor and APIs instead.

Make netdevsim access ->pp through netmem_desc instead of page.

Signed-off-by: Byungchul Park 
Link: https://patch.msgid.link/20250721021835.63939-5-byungchul@sk.com
Signed-off-by: Jakub Kicinski

netdevsim: add fw_update_flash_chunk_time_ms debugfs knobs

2025-07-24T00:08:56+00:00

Netdevsim emulates firmware update and it takes 5 seconds to complete.
For some use cases, this is too long and unnecessary. Allow user to
configure the time by exposing debugfs a knob to set chunk time.

Signed-off-by: Jiri Pirko 
Reviewed-by: Jakub Kicinski 
Link: https://patch.msgid.link/20250722091945.79506-1-jiri@resnulli.us
Signed-off-by: Jakub Kicinski

net: netdevsim: hook in XDP handling

2025-07-23T01:15:53+00:00

Add basic XDP support by hooking in do_xdp_generic().
This should be enough to validate most basic XDP tests.

Signed-off-by: Mohsin Bashir 
Link: https://patch.msgid.link/20250719083059.3209169-2-mohsin.bashr@gmail.com
Signed-off-by: Jakub Kicinski

netdevsim: remove redundant branch

2025-07-18T01:09:27+00:00

bool notify is referenced nowhere else in the function except to check
whether or not to call rtnl_offload_xstats_notify(). Remove it and move
the call to the previous branch.

Signed-off-by: Dennis Chen 
Reviewed-by: Simon Horman 
Reviewed-by: Petr Machata 
Link: https://patch.msgid.link/20250716165750.561175-1-dechen@redhat.com
Signed-off-by: Jakub Kicinski

netdevsim: implement peer queue flow control

2025-07-15T00:36:50+00:00

Add flow control mechanism between paired netdevsim devices to stop the
TX queue during high traffic scenarios. When a receive queue becomes
congested (approaching NSIM_RING_SIZE limit), the corresponding transmit
queue on the peer device is stopped using netif_subqueue_try_stop().

Once the receive queue has sufficient capacity again, the peer's
transmit queue is resumed with netif_tx_wake_queue().

Key changes:
  * Add nsim_stop_peer_tx_queue() to pause peer TX when RX queue is full
  * Add nsim_start_peer_tx_queue() to resume peer TX when RX queue drains
  * Implement queue mapping validation to ensure TX/RX queue count match
  * Wake all queues during device unlinking to prevent stuck queues
  * Use RCU protection when accessing peer device references
  * wake the queues when changing the queue numbers
  * Remove IFF_NO_QUEUE given it will enqueue packets now

The flow control only activates when devices have matching TX/RX queue
counts to ensure proper queue mapping.

Suggested-by: Jakub Kicinski 
Signed-off-by: Breno Leitao 
Link: https://patch.msgid.link/20250711-netdev_flow_control-v3-1-aa1d5a155762@debian.org
Signed-off-by: Jakub Kicinski

net: netdevsim: Support setting dev->perm_addr on port creation

2025-07-12T00:00:18+00:00

Network management daemons that match on the device permanent address
currently have no virtual interface types to test against.
NetworkManager, in particular, has carried an out of tree patch to set
the permanent address on netdevsim devices to use in its CI for this
purpose.

To support this use case, support setting netdev->perm_addr when
creating a netdevsim port.

Reviewed-by: Simon Horman 
Signed-off-by: Toke Høiland-Jørgensen 
Link: https://patch.msgid.link/20250710-netdevsim-perm_addr-v4-1-c9db2fecf3bf@redhat.com
Signed-off-by: Jakub Kicinski

selftest: netdevsim: Add devlink rate tc-bw test

2025-07-02T22:39:05+00:00

Test verifies that netdevsim correctly implements devlink ops callbacks
that set tc-bw on leaf or node rate object.

Signed-off-by: Carolina Jubran 
Reviewed-by: Cosmin Ratiu 
Signed-off-by: Tariq Toukan 
Signed-off-by: Mark Bloch 
Link: https://patch.msgid.link/20250629142138.361537-4-mbloch@nvidia.com
Signed-off-by: Jakub Kicinski

netdevsim: fix UaF when counting Tx stats

2025-06-22T17:50:23+00:00

skb may be freed as soon as we put it on the rx queue.
Use the len variable like the code did prior to the conversion.

Fixes: f9e2511d80c2 ("netdevsim: migrate to dstats stats collection")
Signed-off-by: Jakub Kicinski 
Acked-by: David S. Miller 
Reviewed-by: Breno Leitao 
Signed-off-by: David S. Miller

netdevsim: account dropped packet length in stats on queue free

2025-06-19T23:15:34+00:00

Add a call to dev_dstats_rx_dropped_add() in nsim_queue_free() to
account for the number of packets dropped when purging the skb queue.
This improves the accuracy of RX drop statistics reported by netdevsim.

local_bh_{disable, enable}() protection is used to disable preemption,
which is necessary given that dev_dstats_rx_dropped_add() access
this_cpu_ptr(). See discussion in [1].

Link: https://lore.kernel.org/all/20250617055934.3fd9d322@kernel.org/ [1]
Suggested-by: Jakub Kicinski 
Signed-off-by: Breno Leitao 
Link: https://patch.msgid.link/20250618-netdevsim_stat-v4-4-19fe0d35e28e@debian.org
Signed-off-by: Jakub Kicinski

netdevsim: collect statistics at RX side

2025-06-19T23:15:34+00:00

When the RX side of netdevsim was added, the RX statistics were missing,
making the driver unusable for GenerateTraffic() test framework.

This patch adds proper statistics tracking on RX side, complementing the
TX path.

Reviewed-by: Joe Damato 
Signed-off-by: Breno Leitao 
Link: https://patch.msgid.link/20250618-netdevsim_stat-v4-2-19fe0d35e28e@debian.org
Signed-off-by: Jakub Kicinski