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Subject: Re: [Intel-wired-lan] [PATCH iwl-next v2 2/2] idpf: implement pci error handlers X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" On 4/14/2026 4:09 AM, Loktionov, Aleksandr wrote: > > >> -----Original Message----- >> From: Tantilov, Emil S >> Sent: Tuesday, April 14, 2026 5:17 AM >> To: intel-wired-lan@lists.osuosl.org >> Cc: netdev@vger.kernel.org; Kitszel, Przemyslaw >> ; Bhat, Jay ; >> Barrera, Ivan D ; Loktionov, Aleksandr >> ; Zaremba, Larysa >> ; Nguyen, Anthony L >> ; andrew+netdev@lunn.ch; >> davem@davemloft.net; edumazet@google.com; kuba@kernel.org; >> pabeni@redhat.com; Lobakin, Aleksander ; >> linux-pci@vger.kernel.org; Chittim, Madhu ; >> decot@google.com; willemb@google.com; sheenamo@google.com; >> lukas@wunner.de >> Subject: [PATCH iwl-next v2 2/2] idpf: implement pci error handlers >> >> Add callbacks to handle PCI errors and FLR reset. When preparing to >> handle reset on the bus, the driver must stop all operations that can >> lead to MMIO access in order to prevent HW errors. To accomplish this >> introduce helper >> idpf_reset_prepare() that gets called prior to FLR or when PCI error >> is detected. Upon resume the recovery is done through the existing >> reset path by starting the event task. >> >> The following callbacks are implemented: >> .reset_prepare runs the first portion of the generic reset path >> leading up to the part where we wait for the reset to complete. >> .reset_done/resume runs the recovery part of the reset handling. >> .error_detected is the callback dealing with PCI errors, similar to >> the prepare call, we stop all operations, prior to attempting a >> recovery. >> .slot_reset is the callback attempting to restore the device, provided >> a PCI reset was initiated by the AER driver. >> >> Whereas previously the init logic guaranteed netdevs during reset, the >> addition of idpf_detach_and_close() to the PCI callbacks flow makes it >> possible for the function to be called without netdevs. Add check to >> avoid NULL pointer dereference in that case. >> >> Co-developed-by: Alan Brady >> Signed-off-by: Alan Brady >> Signed-off-by: Emil Tantilov >> Reviewed-by: Jay Bhat >> Reviewed-by: Madhu Chittim >> --- >> drivers/net/ethernet/intel/idpf/idpf.h | 3 + >> drivers/net/ethernet/intel/idpf/idpf_lib.c | 13 ++- >> drivers/net/ethernet/intel/idpf/idpf_main.c | 112 ++++++++++++++++++++ >> 3 files changed, 126 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/net/ethernet/intel/idpf/idpf.h >> b/drivers/net/ethernet/intel/idpf/idpf.h >> index 1d0e32e47e87..164d2f3e233a 100644 >> --- a/drivers/net/ethernet/intel/idpf/idpf.h >> +++ b/drivers/net/ethernet/intel/idpf/idpf.h >> @@ -88,6 +88,7 @@ enum idpf_state { >> * @IDPF_REMOVE_IN_PROG: Driver remove in progress >> * @IDPF_MB_INTR_MODE: Mailbox in interrupt mode >> * @IDPF_VC_CORE_INIT: virtchnl core has been init >> + * @IDPF_PCI_CB_RESET: Reset via the PCI callbacks >> * @IDPF_FLAGS_NBITS: Must be last >> */ >> enum idpf_flags { >> @@ -97,6 +98,7 @@ enum idpf_flags { >> IDPF_REMOVE_IN_PROG, >> IDPF_MB_INTR_MODE, >> IDPF_VC_CORE_INIT, > > ... > >> +/** >> + * idpf_pci_err_resume - Resume operations after PCI error recovery >> + * @pdev: PCI device struct >> + */ >> +static void idpf_pci_err_resume(struct pci_dev *pdev) { >> + struct idpf_adapter *adapter = pci_get_drvdata(pdev); >> + >> + /* Force a PFR when resuming from PCI error. */ >> + if (test_and_set_bit(IDPF_PCI_CB_RESET, adapter->flags)) >> + adapter->dev_ops.reg_ops.trigger_reset(adapter, >> IDPF_HR_FUNC_RESET); > You say "Force a PFR", but PFR is only triggered on the AER path, not on the FLR path. Hence the "force" - the call to `trigger_reset` results in a PFR and is only needed in the case of a PCI error. If this function was called because a user issued an FLR, the kernel will trigger it for us. This way we can reuse the reset handling path to restore the operation of the netdevs. Though I may be misunderstanding - are you referring to the wording or the logic? Thanks, Emil > > Everything else looks fine > Reviewed-by: Aleksandr Loktionov > >> + >> + queue_delayed_work(adapter->vc_event_wq, >> + &adapter->vc_event_task, >> + msecs_to_jiffies(300)); >> +} > > ... > >> }; >> module_pci_driver(idpf_driver); >> -- >> 2.37.3 >