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path: root/drivers/net/netdevsim/netdev.c
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* netdevsim: Fix wild pointer access in nsim_queue_free().Kuniyuki Iwashima2025-08-141-3/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | syzbot reported the splat below. [0] When nsim_queue_uninit() is called from nsim_init_netdevsim(), register_netdevice() has not been called, thus dev->dstats has not been allocated. Let's not call dev_dstats_rx_dropped_add() in such a case. [0] BUG: unable to handle page fault for address: ffff88809782c020 PF: supervisor write access in kernel mode PF: error_code(0x0002) - not-present page PGD 1b401067 P4D 1b401067 PUD 0 Oops: Oops: 0002 [#1] SMP KASAN NOPTI CPU: 3 UID: 0 PID: 8476 Comm: syz.1.251 Not tainted 6.16.0-syzkaller-06699-ge8d780dcd957 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:local_add arch/x86/include/asm/local.h:33 [inline] RIP: 0010:u64_stats_add include/linux/u64_stats_sync.h:89 [inline] RIP: 0010:dev_dstats_rx_dropped_add include/linux/netdevice.h:3027 [inline] RIP: 0010:nsim_queue_free+0xba/0x120 drivers/net/netdevsim/netdev.c:714 Code: 07 77 6c 4a 8d 3c ed 20 7e f1 8d 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 46 4a 03 1c ed 20 7e f1 8d <4c> 01 63 20 be 00 02 00 00 48 8d 3d 00 00 00 00 e8 61 2f 58 fa 48 RSP: 0018:ffffc900044af150 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: ffff88809782c000 RCX: 00000000000079c3 RDX: 1ffffffff1be2fc7 RSI: ffffffff8c15f380 RDI: ffffffff8df17e38 RBP: ffff88805f59d000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000003 R14: ffff88806ceb3d00 R15: ffffed100dfd308e FS: 0000000000000000(0000) GS:ffff88809782c000(0063) knlGS:00000000f505db40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: ffff88809782c020 CR3: 000000006fc6a000 CR4: 0000000000352ef0 Call Trace: <TASK> nsim_queue_uninit drivers/net/netdevsim/netdev.c:993 [inline] nsim_init_netdevsim drivers/net/netdevsim/netdev.c:1049 [inline] nsim_create+0xd0a/0x1260 drivers/net/netdevsim/netdev.c:1101 __nsim_dev_port_add+0x435/0x7d0 drivers/net/netdevsim/dev.c:1438 nsim_dev_port_add_all drivers/net/netdevsim/dev.c:1494 [inline] nsim_dev_reload_create drivers/net/netdevsim/dev.c:1546 [inline] nsim_dev_reload_up+0x5b8/0x860 drivers/net/netdevsim/dev.c:1003 devlink_reload+0x322/0x7c0 net/devlink/dev.c:474 devlink_nl_reload_doit+0xe31/0x1410 net/devlink/dev.c:584 genl_family_rcv_msg_doit+0x206/0x2f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x55c/0x800 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2552 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] ____sys_sendmsg+0xa95/0xc70 net/socket.c:2614 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2668 __sys_sendmsg+0x16d/0x220 net/socket.c:2700 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf708e579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f505d55c EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 0000000080000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> Modules linked in: CR2: ffff88809782c020 Fixes: 2a68a22304f9 ("netdevsim: account dropped packet length in stats on queue free") Reported-by: [email protected] Closes: https://lore.kernel.org/netdev/[email protected]/ Suggested-by: Jakub Kicinski <[email protected]> Signed-off-by: Kuniyuki Iwashima <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: access ->pp through netmem_desc instead of pageByungchul Park2025-07-241-2/+4
| | | | | | | | | | | 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 <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* net: netdevsim: hook in XDP handlingJakub Kicinski2025-07-231-1/+20
| | | | | | | | | 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 <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: implement peer queue flow controlBreno Leitao2025-07-151-7/+61
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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 <[email protected]> Signed-off-by: Breno Leitao <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* net: netdevsim: Support setting dev->perm_addr on port creationToke Høiland-Jørgensen2025-07-121-3/+6
| | | | | | | | | | | | | | | | 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 <[email protected]> Signed-off-by: Toke Høiland-Jørgensen <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: fix UaF when counting Tx statsJakub Kicinski2025-06-221-1/+1
| | | | | | | | | | | 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 <[email protected]> Acked-by: David S. Miller <[email protected]> Reviewed-by: Breno Leitao <[email protected]> Signed-off-by: David S. Miller <[email protected]>
* netdevsim: account dropped packet length in stats on queue freeBreno Leitao2025-06-191-4/+7
| | | | | | | | | | | | | | | | 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/[email protected]/ [1] Suggested-by: Jakub Kicinski <[email protected]> Signed-off-by: Breno Leitao <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: collect statistics at RX sideBreno Leitao2025-06-191-2/+10
| | | | | | | | | | | | | 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 <[email protected]> Signed-off-by: Breno Leitao <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: migrate to dstats stats collectionBreno Leitao2025-06-191-27/+6
| | | | | | | | | | | | | | | | | | | | | Replace custom statistics tracking with the kernel's dstats infrastructure to simplify code and improve consistency with other network drivers. This change: - Sets dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS for automatic automatic allocation and deallocation. - Removes manual stats fields and their update - Replaces custom nsim_get_stats64() with dev_get_stats() - Uses dev_dstats_tx_add() and dev_dstats_tx_dropped() helpers - Eliminates the need for manual synchronization primitives The dstats framework provides the same functionality with less code. Suggested-by: Jakub Kicinski <[email protected]> Reviewed-by: Joe Damato <[email protected]> Signed-off-by: Breno Leitao <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* net: drv: netdevsim: don't napi_complete() from netpollJakub Kicinski2025-06-121-1/+2
| | | | | | | | | | | | | | | | | | netdevsim supports netpoll. Make sure we don't call napi_complete() from it, since it may not be scheduled. Breno reports hitting a warning in napi_complete_done(): WARNING: CPU: 14 PID: 104 at net/core/dev.c:6592 napi_complete_done+0x2cc/0x560 __napi_poll+0x2d8/0x3a0 handle_softirqs+0x1fe/0x710 This is presumably after netpoll stole the SCHED bit prematurely. Reported-by: Breno Leitao <[email protected]> Fixes: 3762ec05a9fb ("netdevsim: add NAPI support") Tested-by: Breno Leitao <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* selftests: net: validate team flags propagationStanislav Fomichev2025-05-211-0/+2
| | | | | | | | | | | | | | | | | | | Cover three recent cases: 1. missing ops locking for the lowers during netdev_sync_lower_features 2. missing locking for dev_set_promiscuity (plus netdev_ops_assert_locked with a comment on why/when it's needed) 3. rcu lock during team_change_rx_flags Verified that each one triggers when the respective fix is reverted. Not sure about the placement, but since it all relies on teaming, added to the teaming directory. One ugly bit is that I add NETIF_F_LRO to netdevsim; there is no way to trigger netdev_sync_lower_features without it. Signed-off-by: Stanislav Fomichev <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: Mark NAPI ID on skb in nsim_rcvJoe Damato2025-04-251-0/+2
| | | | | | | | | | | | | Previously, nsim_rcv was not marking the NAPI ID on the skb, leading to applications seeing a napi ID of 0 when using SO_INCOMING_NAPI_ID. To add to the userland confusion, netlink appears to correctly report the NAPI IDs for netdevsim queues but the resulting file descriptor from a call to accept() was reporting a NAPI ID of 0. Signed-off-by: Joe Damato <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* treewide: Convert new and leftover hrtimer_init() usersThomas Gleixner2025-04-051-2/+2
| | | | | | | | | | | | | hrtimer_setup() takes the callback function pointer as argument and initializes the timer completely. Replace hrtimer_init() and the open coded initialization of hrtimer::function with the new setup mechanism. Coccinelle scripted cleanup. Signed-off-by: Thomas Gleixner <[email protected]> Signed-off-by: Ingo Molnar <[email protected]>
* netdevsim: add dummy device notifiersStanislav Fomichev2025-04-031-0/+13
| | | | | | | | | | | | In order to exercise and verify notifiers' locking assumptions, register dummy notifiers (via register_netdevice_notifier_dev_net). Share notifier event handler that enforces the assumptions with lock_debug.c (rename and export rtnl_net_debug_event as netdev_debug_event). Add ops lock asserts to netdev_debug_event. Signed-off-by: Stanislav Fomichev <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: 'support' multi-buf XDPJakub Kicinski2025-03-121-1/+2
| | | | | | | | | | | Don't error out on large MTU if XDP is multi-buf. The ping test now tests ping with XDP and high MTU. netdevsim doesn't actually run the prog (yet?) so it doesn't matter if the prog was multi-buf.. Reviewed-by: Michal Kubiak <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* net: drop rtnl_lock for queue_mgmt operationsStanislav Fomichev2025-03-121-2/+2
| | | | | | | | | | | All drivers that use queue API are already converted to use netdev instance lock. Move netdev instance lock management to the netlink layer and drop rtnl_lock. Signed-off-by: Stanislav Fomichev <[email protected]> Reviewed-by: Mina Almasry. <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* net: move misc netdev_lock flavors to a separate headerJakub Kicinski2025-03-081-0/+1
| | | | | | | | | | | | | | | Move the more esoteric helpers for netdev instance lock to a dedicated header. This avoids growing netdevice.h to infinity and makes rebuilding the kernel much faster (after touching the header with the helpers). The main netdev_lock() / netdev_unlock() functions are used in static inlines in netdevice.h and will probably be used most commonly, so keep them in netdevice.h. Acked-by: Stanislav Fomichev <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* net: hold netdev instance lock during queue operationsStanislav Fomichev2025-03-061-9/+16
| | | | | | | | | | | | | | | | | | | For the drivers that use queue management API, switch to the mode where core stack holds the netdev instance lock. This affects the following drivers: - bnxt - gve - netdevsim Originally I locked only start/stop, but switched to holding the lock over all iterations to make them look atomic to the device (feels like it should be easier to reason about). Reviewed-by: Eric Dumazet <[email protected]> Cc: Saeed Mahameed <[email protected]> Signed-off-by: Stanislav Fomichev <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* net: hold netdev instance lock during ndo_open/ndo_stopStanislav Fomichev2025-03-061-5/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For the drivers that use shaper API, switch to the mode where core stack holds the netdev lock. This affects two drivers: * iavf - already grabs netdev lock in ndo_open/ndo_stop, so mostly remove these * netdevsim - switch to _locked APIs to avoid deadlock iavf_close diff is a bit confusing, the existing call looks like this: iavf_close() { netdev_lock() .. netdev_unlock() wait_event_timeout(down_waitqueue) } I change it to the following: netdev_lock() iavf_close() { .. netdev_unlock() wait_event_timeout(down_waitqueue) netdev_lock() // reusing this lock call } netdev_unlock() Since I'm reusing existing netdev_lock call, so it looks like I only add netdev_unlock. Cc: Saeed Mahameed <[email protected]> Signed-off-by: Stanislav Fomichev <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: call napi_schedule from a timer contextBreno Leitao2025-02-201-1/+20
| | | | | | | | | | | | | | | | | | | | 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 <[email protected]> Signed-off-by: Breno Leitao <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: allow normal queue reset while downJakub Kicinski2025-02-081-6/+4
| | | | | | | | | | 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 <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* net: move HDS config from ethtool stateJakub Kicinski2025-01-201-5/+5
| | | | | | | | | | | 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 <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: add HDS featureTaehee Yoo2025-01-151-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: add debugfs-triggered queue resetJakub Kicinski2025-01-091-0/+55
| | | | | | | | | | | Support triggering queue reset via debugfs for an upcoming test. Reviewed-by: Willem de Bruijn <[email protected]> Acked-by: Stanislav Fomichev <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]> Reviewed-by: Mina Almasry <[email protected]> Signed-off-by: Paolo Abeni <[email protected]>
* netdevsim: add queue management API supportJakub Kicinski2025-01-091-12/+122
| | | | | | | | | | | | | 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 <[email protected]> Acked-by: Stanislav Fomichev <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]> Reviewed-by: Mina Almasry <[email protected]> Signed-off-by: Paolo Abeni <[email protected]>
* netdevsim: add queue alloc/free helpersJakub Kicinski2025-01-091-11/+24
| | | | | | | | | | | We'll need the code to allocate and free queues in the queue management API, factor it out. Reviewed-by: Willem de Bruijn <[email protected]> Reviewed-by: Eric Dumazet <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]> Signed-off-by: Paolo Abeni <[email protected]>
* netdevsim: allocate rqs individuallyJakub Kicinski2025-01-091-18/+31
| | | | | | | | | | | 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 <[email protected]> Reviewed-by: Eric Dumazet <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]> Signed-off-by: Paolo Abeni <[email protected]>
* netdevsim: support NAPI configJakub Kicinski2025-01-091-1/+1
| | | | | | | | | | | 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 <[email protected]> Reviewed-by: Eric Dumazet <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]> Signed-off-by: Paolo Abeni <[email protected]>
* net: netdevsim: fix nsim_pp_hold_write()Eric Dumazet2024-12-181-2/+2
| | | | | | | | | | | | | | | 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 <[email protected]> Signed-off-by: Eric Dumazet <[email protected]> Reviewed-by: Simon Horman <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: add more hw_featuresSabrina Dubroca2024-11-111-1/+5
| | | | | | | | | | | | | | | | | netdevsim currently only set HW_TC in its hw_features, but other features should also be present to better reflect the behavior of real HW. In my macsec offload testing, this ends up as HW_CSUM being missing from hw_features, so it doesn't stick in wanted_features when offload is turned off. Then HW_CSUM (and thus TSO, thanks to netdev_fix_features) is not automatically turned back on when offload is re-enabled. Signed-off-by: Sabrina Dubroca <[email protected]> Reviewed-by: Simon Horman <[email protected]> Link: https://patch.msgid.link/b918dc4dd76410a57f7516a855f66b0a2bd58326.1730929545.git.sd@queasysnail.net Signed-off-by: Jakub Kicinski <[email protected]>
* testing: net-drv: add basic shaper testPaolo Abeni2024-10-101-0/+39
| | | | | | | | | | Leverage a basic/dummy netdevsim implementation to do functional coverage for NL interface. Reviewed-by: Jiri Pirko <[email protected]> Signed-off-by: Paolo Abeni <[email protected]> Link: https://patch.msgid.link/43092afbf38365c796088bf8fc155e523ab434ae.1728460186.git.pabeni@redhat.com Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: fix backwards compatibility in nsim_get_iflink()David Wei2024-06-101-1/+2
| | | | | | | | | | | | | | | | The default ndo_get_iflink() implementation returns the current ifindex of the netdev. But the overridden nsim_get_iflink() returns 0 if the current nsim is not linked, breaking backwards compatibility for userspace that depend on this behaviour. Fix the problem by returning the current ifindex if not linked to a peer. Fixes: 8debcf5832c3 ("netdevsim: add ndo_get_iflink() implementation") Reported-by: Yu Watanabe <[email protected]> Suggested-by: Yu Watanabe <[email protected]> Signed-off-by: David Wei <[email protected]> Signed-off-by: David S. Miller <[email protected]>
* netdevsim: add NAPI supportDavid Wei2024-05-091-11/+198
| | | | | | | | | | | | | | 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 <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* net: annotate writes on dev->mtu from ndo_change_mtu()Eric Dumazet2024-05-071-1/+1
| | | | | | | | | | | | | | | | | | | | | | | Simon reported that ndo_change_mtu() methods were never updated to use WRITE_ONCE(dev->mtu, new_mtu) as hinted in commit 501a90c94510 ("inet: protect against too small mtu values.") We read dev->mtu without holding RTNL in many places, with READ_ONCE() annotations. It is time to take care of ndo_change_mtu() methods to use corresponding WRITE_ONCE() Signed-off-by: Eric Dumazet <[email protected]> Reported-by: Simon Horman <[email protected]> Closes: https://lore.kernel.org/netdev/[email protected]/ Reviewed-by: Jacob Keller <[email protected]> Reviewed-by: Sabrina Dubroca <[email protected]> Reviewed-by: Simon Horman <[email protected]> Acked-by: Shannon Nelson <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* net: netdevsim: add some fake page pool useJakub Kicinski2024-04-151-0/+93
| | | | | | | | | | | | | 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/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: report stats by default, like a real deviceJakub Kicinski2024-04-081-0/+49
| | | | | | | | | | | | | | Real devices should implement qstats. Devices which support pause or FEC configuration should also report the relevant stats. nsim was missing FEC stats completely, some of the qstats and pause stats required toggling a debugfs knob. Note that the tests which used pause always initialize the setting so they shouldn't be affected by the different starting value. Signed-off-by: Jakub Kicinski <[email protected]> Signed-off-by: David S. Miller <[email protected]>
* netdevsim: add ndo_get_iflink() implementationDavid Wei2024-03-011-0/+16
| | | | | | | | | Add an implementation for ndo_get_iflink() in netdevsim that shows the ifindex of the linked peer, if any. Signed-off-by: David Wei <[email protected]> Reviewed-by: Maciek Machnikowski <[email protected]> Signed-off-by: David S. Miller <[email protected]>
* netdevsim: forward skbs from one connected port to anotherDavid Wei2024-03-011-5/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 <[email protected]> Reviewed-by: Maciek Machnikowski <[email protected]> Signed-off-by: David S. Miller <[email protected]>
* netdevsim: allow two netdevsim ports to be connectedDavid Wei2024-03-011-0/+10
| | | | | | | | | | | | | | | | | | 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 <[email protected]> Reviewed-by: Maciek Machnikowski <[email protected]> Signed-off-by: David S. Miller <[email protected]>
* net: netdevsim: don't try to destroy PHC on VFsJakub Kicinski2024-01-171-2/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | PHC gets initialized in nsim_init_netdevsim(), which is only called if (nsim_dev_port_is_pf()). Create a counterpart of nsim_init_netdevsim() and move the mock_phc_destroy() there. This fixes a crash trying to destroy netdevsim with VFs instantiated, as caught by running the devlink.sh test: BUG: kernel NULL pointer dereference, address: 00000000000000b8 RIP: 0010:mock_phc_destroy+0xd/0x30 Call Trace: <TASK> nsim_destroy+0x4a/0x70 [netdevsim] __nsim_dev_port_del+0x47/0x70 [netdevsim] nsim_dev_reload_destroy+0x105/0x120 [netdevsim] nsim_drv_remove+0x2f/0xb0 [netdevsim] device_release_driver_internal+0x1a1/0x210 bus_remove_device+0xd5/0x120 device_del+0x159/0x490 device_unregister+0x12/0x30 del_device_store+0x11a/0x1a0 [netdevsim] kernfs_fop_write_iter+0x130/0x1d0 vfs_write+0x30b/0x4b0 ksys_write+0x69/0xf0 do_syscall_64+0xcc/0x1e0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Fixes: b63e78fca889 ("net: netdevsim: use mock PHC driver") Signed-off-by: Jakub Kicinski <[email protected]> Reviewed-by: Simon Horman <[email protected]> Signed-off-by: David S. Miller <[email protected]>
* net: fill in MODULE_DESCRIPTION()s in kuba@'s modulesJakub Kicinski2023-10-281-0/+1
| | | | | | | | | W=1 builds now warn if module is built without a MODULE_DESCRIPTION(). Fill it in for the modules I maintain. Acked-by: Kalle Valo <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]> Signed-off-by: David S. Miller <[email protected]>
* net: netdevsim: mimic tc-taprio offloadVladimir Oltean2023-08-091-0/+27
| | | | | | | | | | | | | | To be able to use netdevsim for tc-testing with an offloaded tc-taprio schedule, it needs to report a PTP clock (which it now does), and to accept ndo_setup_tc(TC_SETUP_QDISC_TAPRIO) calls. Since netdevsim has no packet I/O, this doesn't do anything intelligent, it only allows taprio offload code paths to go through some level of automated testing. Signed-off-by: Vladimir Oltean <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* net: netdevsim: use mock PHC driverVladimir Oltean2023-08-091-1/+10
| | | | | | | | | | | | | | | 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 <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
* netdevsim: add dummy macsec offloadSabrina Dubroca2023-07-141-0/+3
| | | | | | | | | | | | | | | | | | | | When the kernel is compiled with MACsec support, add the NETIF_F_HW_MACSEC feature to netdevsim devices and implement macsec_ops. To allow easy testing of failure from the device, support is limited to 3 SecY's per netdevsim device, and 1 RXSC per SecY. v2: - nsim_macsec_add_secy, return -ENOSPC if secy_count isn't full but we can't find an empty slot (Simon Horman) - add sci_to_cpu to make sparse happy (Simon Horman) - remove set but not used secy variable (kernel test robot and Simon Horman) Signed-off-by: Sabrina Dubroca <[email protected]> Reviewed-by: Simon Horman <[email protected]> Signed-off-by: David S. Miller <[email protected]>
* drivers: net: turn on XDP featuresMarek Majtyka2023-02-031-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | A summary of the flags being set for various drivers is given below. Note that XDP_F_REDIRECT_TARGET and XDP_F_FRAG_TARGET are features that can be turned off and on at runtime. This means that these flags may be set and unset under RTNL lock protection by the driver. Hence, READ_ONCE must be used by code loading the flag value. Also, these flags are not used for synchronization against the availability of XDP resources on a device. It is merely a hint, and hence the read may race with the actual teardown of XDP resources on the device. This may change in the future, e.g. operations taking a reference on the XDP resources of the driver, and in turn inhibiting turning off this flag. However, for now, it can only be used as a hint to check whether device supports becoming a redirection target. Turn 'hw-offload' feature flag on for: - netronome (nfp) - netdevsim. Turn 'native' and 'zerocopy' features flags on for: - intel (i40e, ice, ixgbe, igc) - mellanox (mlx5). - stmmac - netronome (nfp) Turn 'native' features flags on for: - amazon (ena) - broadcom (bnxt) - freescale (dpaa, dpaa2, enetc) - funeth - intel (igb) - marvell (mvneta, mvpp2, octeontx2) - mellanox (mlx4) - mtk_eth_soc - qlogic (qede) - sfc - socionext (netsec) - ti (cpsw) - tap - tsnep - veth - xen - virtio_net. Turn 'basic' (tx, pass, aborted and drop) features flags on for: - netronome (nfp) - cavium (thunder) - hyperv. Turn 'redirect_target' feature flag on for: - amanzon (ena) - broadcom (bnxt) - freescale (dpaa, dpaa2) - intel (i40e, ice, igb, ixgbe) - ti (cpsw) - marvell (mvneta, mvpp2) - sfc - socionext (netsec) - qlogic (qede) - mellanox (mlx5) - tap - veth - virtio_net - xen Reviewed-by: Gerhard Engleder <[email protected]> Reviewed-by: Simon Horman <[email protected]> Acked-by: Stanislav Fomichev <[email protected]> Acked-by: Jakub Kicinski <[email protected]> Co-developed-by: Kumar Kartikeya Dwivedi <[email protected]> Signed-off-by: Kumar Kartikeya Dwivedi <[email protected]> Co-developed-by: Lorenzo Bianconi <[email protected]> Signed-off-by: Lorenzo Bianconi <[email protected]> Signed-off-by: Marek Majtyka <[email protected]> Link: https://lore.kernel.org/r/3eca9fafb308462f7edb1f58e451d59209aa07eb.1675245258.git.lorenzo@kernel.org Signed-off-by: Alexei Starovoitov <[email protected]>
* net: remove unused ndo_get_devlink_portJiri Pirko2022-11-041-9/+0
| | | | | | | | Remove ndo_get_devlink_port which is no longer used alongside with the implementations in drivers. Signed-off-by: Jiri Pirko <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]>
* net: make drivers to use SET_NETDEV_DEVLINK_PORT to set devlink_portJiri Pirko2022-11-041-0/+1
| | | | | | | | | | | Benefit from the previously implemented tracking of netdev events in devlink code and instead of calling devlink_port_type_eth_set() and devlink_port_type_clear() to set devlink port type and link to related netdev, use SET_NETDEV_DEVLINK_PORT() macro to assign devlink_port pointer to netdevice which is about to be registered. Signed-off-by: Jiri Pirko <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]>
* net: Remove the obsolte u64_stats_fetch_*_irq() users (drivers).Thomas Gleixner2022-10-291-2/+2
| | | | | | | | | | | | Now that the 32bit UP oddity is gone and 32bit uses always a sequence count, there is no need for the fetch_irq() variants anymore. Convert to the regular interface. Signed-off-by: Thomas Gleixner <[email protected]> Signed-off-by: Sebastian Andrzej Siewior <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Signed-off-by: Jakub Kicinski <[email protected]>
* net: Use u64_stats_fetch_begin_irq() for stats fetch.Sebastian Andrzej Siewior2022-08-291-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On 32bit-UP u64_stats_fetch_begin() disables only preemption. If the reader is in preemptible context and the writer side (u64_stats_update_begin*()) runs in an interrupt context (IRQ or softirq) then the writer can update the stats during the read operation. This update remains undetected. Use u64_stats_fetch_begin_irq() to ensure the stats fetch on 32bit-UP are not interrupted by a writer. 32bit-SMP remains unaffected by this change. Cc: "David S. Miller" <[email protected]> Cc: Catherine Sullivan <[email protected]> Cc: David Awogbemila <[email protected]> Cc: Dimitris Michailidis <[email protected]> Cc: Eric Dumazet <[email protected]> Cc: Hans Ulli Kroll <[email protected]> Cc: Jakub Kicinski <[email protected]> Cc: Jeroen de Borst <[email protected]> Cc: Johannes Berg <[email protected]> Cc: Linus Walleij <[email protected]> Cc: Paolo Abeni <[email protected]> Cc: Simon Horman <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Signed-off-by: Sebastian Andrzej Siewior <[email protected]> Reviewed-by: Simon Horman <[email protected]> Signed-off-by: David S. Miller <[email protected]>
* netdevsim: move vfconfig to nsim_devJakub Kicinski2021-11-011-36/+36
| | | | | | | | | | | | | | | | | When netdevsim got split into the faux bus vfconfig ended up in the bus device (think pci_dev) which is strange because it contains very networky not to say netdevy information. Move it to nsim_dev, which is the driver "priv" structure for the device. To make sure we don't race with probe/remove take the device lock (much like PCI). While at it remove the NULL-checking of vfconfigs. It appears to be pointless. Signed-off-by: Jakub Kicinski <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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