[{"id":3664447,"web_url":"http://patchwork.ozlabs.org/comment/3664447/","msgid":"","list_archive_url":null,"date":"2026-03-16T11:37:38","subject":"Re: [Intel-wired-lan] [PATCH iwl-next 4/4] iavf: harden VLAN filter\n state machine race handling","submitter":{"id":75597,"url":"http://patchwork.ozlabs.org/api/people/75597/","name":"Loktionov, Aleksandr","email":"aleksandr.loktionov@intel.com"},"content":"> -----Original Message-----\n> From: Intel-wired-lan On Behalf\n> Of Petr Oros\n> Sent: Monday, March 16, 2026 11:42 AM\n> To: netdev@vger.kernel.org\n> Cc: Kitszel, Przemyslaw ; Eric Dumazet\n> ; linux-kernel@vger.kernel.org; Andrew Lunn\n> ; Nguyen, Anthony L\n> ; intel-wired-lan@lists.osuosl.org;\n> Keller, Jacob E ; Jakub Kicinski\n> ; Paolo Abeni ; David S. Miller\n> \n> Subject: [Intel-wired-lan] [PATCH iwl-next 4/4] iavf: harden VLAN\n> filter state machine race handling\n> \n> Address remaining race windows in the VLAN filter state machine that\n> were identified during cross-state analysis of ADD and DEL paths.\n> \n> 1. Add VIRTCHNL_OP_ADD_VLAN to the success completion handler.\n> \n> The V1 ADD_VLAN opcode had no success handler -- filters sent via\n> V1\n> stayed in ADDING state permanently. Add a fallthrough case so V1\n> filters also transition ADDING -> ACTIVE on PF confirmation.\n> \n> Critically, add an `if (v_retval) break` guard: the error switch\n> in iavf_virtchnl_completion() does NOT return after handling\n> errors,\n> it falls through to the success switch. Without this guard, a\n> PF-rejected ADD would incorrectly mark ADDING filters as ACTIVE,\n> creating a driver/HW mismatch where the driver believes the filter\n> is installed but the PF never accepted it.\n> \n> For V2, this is harmless: iavf_vlan_add_reject() in the error\n> block already kfree'd all ADDING filters, so the success handler\n> finds nothing to transition.\n> \n> 2. Skip DEL on filters already in REMOVING state.\n> \n> In iavf_del_vlan(), if a filter is in IAVF_VLAN_REMOVING (DEL\n> already sent to PF, waiting for response), do not overwrite to\n> REMOVE and schedule a redundant DEL. The pending DEL's\n> completion handler will either kfree the filter (PF confirms)\n> or revert to ACTIVE (PF rejects).\n> \n> Without this, the sequence DEL(pending) -> user-del -> second DEL\n> could result in PF returning an error for the second DEL (filter\n> already gone), causing the completion handler to incorrectly revert\n> a deleted filter back to ACTIVE.\n> \n> Signed-off-by: Petr Oros \n> ---\n> drivers/net/ethernet/intel/iavf/iavf_main.c | 5 ++++-\n> drivers/net/ethernet/intel/iavf/iavf_virtchnl.c | 4 ++++\n> 2 files changed, 8 insertions(+), 1 deletion(-)\n> \n> diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c\n> b/drivers/net/ethernet/intel/iavf/iavf_main.c\n> index 89e5aae20d5573..1ffc0ce3f35602 100644\n> --- a/drivers/net/ethernet/intel/iavf/iavf_main.c\n> +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c\n> @@ -816,11 +816,14 @@ static void iavf_del_vlan(struct iavf_adapter\n> *adapter, struct iavf_vlan vlan)\n> \t\t\tlist_del(&f->list);\n> \t\t\tkfree(f);\n> \t\t\tadapter->num_vlan_filters--;\n> -\t\t} else {\n> +\t\t} else if (f->state != IAVF_VLAN_REMOVING) {\n> \t\t\tf->state = IAVF_VLAN_REMOVE;\n> \t\t\tiavf_schedule_aq_request(adapter,\n> \n> IAVF_FLAG_AQ_DEL_VLAN_FILTER);\n> \t\t}\n> +\t\t/* If REMOVING, DEL is already sent to PF; completion\n> +\t\t * handler will free the filter when PF confirms.\n> +\t\t */\n> \t}\n> \n> \tspin_unlock_bh(&adapter->mac_vlan_list_lock);\n> diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c\n> b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c\n> index d0b7b810679399..147adb76f64141 100644\n> --- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c\n> +++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c\n> @@ -2877,9 +2877,13 @@ void iavf_virtchnl_completion(struct\n> iavf_adapter *adapter,\n> \t\tspin_unlock_bh(&adapter->adv_rss_lock);\n> \t\t}\n> \t\tbreak;\n> +\tcase VIRTCHNL_OP_ADD_VLAN:\n> \tcase VIRTCHNL_OP_ADD_VLAN_V2: {\n> \t\tstruct iavf_vlan_filter *f;\n> \n> +\t\tif (v_retval)\n> +\t\t\tbreak;\n> +\n> \t\tspin_lock_bh(&adapter->mac_vlan_list_lock);\n> \t\tlist_for_each_entry(f, &adapter->vlan_filter_list, list)\n> {\n> \t\t\tif (f->state == IAVF_VLAN_ADDING)\n> --\n> 2.52.0\n\nReviewed-by: Aleksandr Loktionov ","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=ZvqCDjQL;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::138; 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netdev@vger.kernel.org\n> Cc: Kitszel, Przemyslaw ; Eric Dumazet\n> ; linux-kernel@vger.kernel.org; Andrew Lunn\n> ; Nguyen, Anthony L ;\n> intel-wired-lan@lists.osuosl.org; Keller, Jacob E ;\n> Jakub Kicinski ; Paolo Abeni ; David S.\n> Miller \n> Subject: Re: [Intel-wired-lan] [PATCH iwl-next 4/4] iavf: harden VLAN filter state\n> machine race handling\n> \n> \n> \n> > -----Original Message-----\n> > From: Intel-wired-lan On Behalf\n> > Of Petr Oros\n> > Sent: Monday, March 16, 2026 11:42 AM\n> > To: netdev@vger.kernel.org\n> > Cc: Kitszel, Przemyslaw ; Eric Dumazet\n> > ; linux-kernel@vger.kernel.org; Andrew Lunn\n> > ; Nguyen, Anthony L\n> > ; intel-wired-lan@lists.osuosl.org;\n> > Keller, Jacob E ; Jakub Kicinski\n> > ; Paolo Abeni ; David S. Miller\n> > \n> > Subject: [Intel-wired-lan] [PATCH iwl-next 4/4] iavf: harden VLAN\n> > filter state machine race handling\n> >\n> > Address remaining race windows in the VLAN filter state machine that\n> > were identified during cross-state analysis of ADD and DEL paths.\n> >\n> > 1. Add VIRTCHNL_OP_ADD_VLAN to the success completion handler.\n> >\n> > The V1 ADD_VLAN opcode had no success handler -- filters sent via\n> > V1\n> > stayed in ADDING state permanently. Add a fallthrough case so V1\n> > filters also transition ADDING -> ACTIVE on PF confirmation.\n> >\n> > Critically, add an `if (v_retval) break` guard: the error switch\n> > in iavf_virtchnl_completion() does NOT return after handling\n> > errors,\n> > it falls through to the success switch. Without this guard, a\n> > PF-rejected ADD would incorrectly mark ADDING filters as ACTIVE,\n> > creating a driver/HW mismatch where the driver believes the filter\n> > is installed but the PF never accepted it.\n> >\n> > For V2, this is harmless: iavf_vlan_add_reject() in the error\n> > block already kfree'd all ADDING filters, so the success handler\n> > finds nothing to transition.\n> >\n> > 2. Skip DEL on filters already in REMOVING state.\n> >\n> > In iavf_del_vlan(), if a filter is in IAVF_VLAN_REMOVING (DEL\n> > already sent to PF, waiting for response), do not overwrite to\n> > REMOVE and schedule a redundant DEL. The pending DEL's\n> > completion handler will either kfree the filter (PF confirms)\n> > or revert to ACTIVE (PF rejects).\n> >\n> > Without this, the sequence DEL(pending) -> user-del -> second DEL\n> > could result in PF returning an error for the second DEL (filter\n> > already gone), causing the completion handler to incorrectly revert\n> > a deleted filter back to ACTIVE.\n> >\n> > Signed-off-by: Petr Oros \n> > ---\n> > drivers/net/ethernet/intel/iavf/iavf_main.c | 5 ++++-\n> > drivers/net/ethernet/intel/iavf/iavf_virtchnl.c | 4 ++++\n> > 2 files changed, 8 insertions(+), 1 deletion(-)\n> >\n> > diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c\n> > b/drivers/net/ethernet/intel/iavf/iavf_main.c\n> > index 89e5aae20d5573..1ffc0ce3f35602 100644\n> > --- a/drivers/net/ethernet/intel/iavf/iavf_main.c\n> > +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c\n> > @@ -816,11 +816,14 @@ static void iavf_del_vlan(struct iavf_adapter\n\n\nTested-by: Rafal Romanowski ","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=wZkzuIhj;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::138; 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