linux/drivers/net/netdevsim/netdevsim.h, branch v6.14

net: netdevsim: try to close UDP port harness races

2025-01-27T22:24:34Z

syzbot discovered that we remove the debugfs files after we free the netdev. Try to clean up the relevant dir while the device is still around. Reported-by: syzbot+2e5de9e3ab986b71d2bf@syzkaller.appspotmail.com Fixes: 424be63ad831 ("netdevsim: add UDP tunnel port offload support") Reviewed-by: Michal Swiatkowski Link: https://patch.msgid.link/20250122224503.762705-1-kuba@kernel.org Signed-off-by: Jakub Kicinski

netdevsim: add HDS feature

2025-01-15T22:42:12Z

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 Link: https://patch.msgid.link/20250114142852.3364986-10-ap420073@gmail.com Signed-off-by: Jakub Kicinski

netdevsim: add debugfs-triggered queue reset

2025-01-09T14:33:08Z

Support triggering queue reset via debugfs for an upcoming test. Reviewed-by: Willem de Bruijn Acked-by: Stanislav Fomichev Signed-off-by: Jakub Kicinski Reviewed-by: Mina Almasry Signed-off-by: Paolo Abeni

netdevsim: add queue management API support

2025-01-09T14:33:08Z

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 Acked-by: Stanislav Fomichev Signed-off-by: Jakub Kicinski Reviewed-by: Mina Almasry Signed-off-by: Paolo Abeni

netdevsim: allocate rqs individually

2025-01-09T14:33:08Z

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 Reviewed-by: Eric Dumazet Signed-off-by: Jakub Kicinski Signed-off-by: Paolo Abeni

netdevsim: add NAPI support

2024-05-09T01:59:47Z

Add NAPI support to netdevim, similar to veth. * Add a nsim_rq rx queue structure to hold a NAPI instance and a skb queue. * During xmit, store the skb in the peer skb queue and schedule NAPI. * During napi_poll(), drain the skb queue and pass up the stack. * Add assoc between rxq and NAPI instance using netif_queue_set_napi(). Signed-off-by: David Wei Link: https://lore.kernel.org/r/20240507163228.2066817-2-dw@davidwei.uk Signed-off-by: Jakub Kicinski

net: netdevsim: add some fake page pool use

2024-04-15T18:21:11Z

Add very basic page pool use so that we can exercise the netlink uAPI in a selftest. Page pool gets created on open, destroyed on close. But we control allocating of a single page thru debugfs. This page may survive past the page pool itself so that we can test orphaned page pools. Link: https://lore.kernel.org/r/20240412141436.828666-2-kuba@kernel.org Signed-off-by: Jakub Kicinski

netdevsim: forward skbs from one connected port to another

2024-03-01T10:43:10Z

Forward skbs sent from one netdevsim port to its connected netdevsim port using dev_forward_skb, in a spirit similar to veth. Add a tx_dropped variable to struct netdevsim, tracking the number of skbs that could not be forwarded using dev_forward_skb(). The xmit() function accessing the peer ptr is protected by an RCU read critical section. The rcu_read_lock() is functionally redundant as since v5.0 all softirqs are implicitly RCU read critical sections; but it is useful for human readers. If another CPU is concurrently in nsim_destroy(), then it will first set the peer ptr to NULL. This does not affect any existing readers that dereferenced a non-NULL peer. Then, in unregister_netdevice(), there is a synchronize_rcu() before the netdev is actually unregistered and freed. This ensures that any readers i.e. xmit() that got a non-NULL peer will complete before the netdev is freed. Any readers after the RCU_INIT_POINTER() but before synchronize_rcu() will dereference NULL, making it safe. The codepath to nsim_destroy() and nsim_create() takes both the newly added nsim_dev_list_lock and rtnl_lock. This makes it safe with concurrent calls to linking two netdevsims together. Signed-off-by: David Wei Reviewed-by: Maciek Machnikowski Signed-off-by: David S. Miller

netdevsim: allow two netdevsim ports to be connected

2024-03-01T10:43:10Z

Add two netdevsim bus attribute to sysfs: /sys/bus/netdevsim/link_device /sys/bus/netdevsim/unlink_device Writing "A M B N" to link_device will link netdevsim M in netnsid A with netdevsim N in netnsid B. Writing "A M" to unlink_device will unlink netdevsim M in netnsid A from its peer, if any. rtnl_lock is taken to ensure nothing changes during the linking. Signed-off-by: David Wei Reviewed-by: Maciek Machnikowski Signed-off-by: David S. Miller

net: netdevsim: use mock PHC driver

2023-08-09T22:59:21Z

I'd like to make netdevsim offload tc-taprio, but currently, this Qdisc emits a ETHTOOL_GET_TS_INFO call to the driver to make sure that it has a PTP clock, so that it is reasonably capable of offloading the schedule. By using the mock PHC driver, that becomes possible. Hardware timestamping is not necessary, and netdevsim does not support packet I/O anyway. Signed-off-by: Vladimir Oltean Link: https://lore.kernel.org/r/20230807193324.4128292-8-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski