[{"id":3675234,"web_url":"http://patchwork.ozlabs.org/comment/3675234/","msgid":"","list_archive_url":null,"date":"2026-04-09T10:11:24","subject":"Re: [Intel-wired-lan] [PATCH iwl-next 3/4] iavf: wait for PF\n confirmation before removing VLAN filters","submitter":{"id":85634,"url":"http://patchwork.ozlabs.org/api/people/85634/","name":"Romanowski, Rafal","email":"rafal.romanowski@intel.com"},"content":"> -----Original Message-----\n> From: Intel-wired-lan On Behalf Of Petr\n> 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; Keller, Jacob E ;\n> Jakub Kicinski ; Paolo Abeni ; David S.\n> Miller \n> Subject: [Intel-wired-lan] [PATCH iwl-next 3/4] iavf: wait for PF confirmation\n> before removing VLAN filters\n> \n> The VLAN filter DELETE path was asymmetric with the ADD path: ADD waits for\n> PF confirmation (ADD -> ADDING -> ACTIVE), but DELETE immediately frees the\n> filter struct after sending the DEL message without waiting for the PF response.\n> \n> This is problematic because:\n> - If the PF rejects the DEL, the filter remains in HW but the driver\n> has already freed the tracking structure, losing sync.\n> - Race conditions between DEL pending and other operations\n> (add, reset) cannot be properly resolved if the filter struct\n> is already gone.\n> \n> Add IAVF_VLAN_REMOVING state to make the DELETE path symmetric:\n> \n> REMOVE -> REMOVING (send DEL) -> PF confirms -> kfree\n> -> PF rejects -> ACTIVE\n> \n> In iavf_del_vlans(), transition filters from REMOVE to REMOVING instead of\n> immediately freeing them. The new DEL completion handler in\n> iavf_virtchnl_completion() frees filters on success or reverts them to ACTIVE on\n> error.\n> \n> Update iavf_add_vlan() to handle the REMOVING state: if a DEL is pending and\n> the user re-adds the same VLAN, queue it for ADD so it gets re-programmed after\n> the PF processes the DEL.\n> \n> The !VLAN_FILTERING_ALLOWED early-exit path still frees filters directly since no\n> PF message is sent in that case.\n> \n> Signed-off-by: Petr Oros \n> ---\n> drivers/net/ethernet/intel/iavf/iavf.h | 1 +\n> drivers/net/ethernet/intel/iavf/iavf_main.c | 9 +++--\n> .../net/ethernet/intel/iavf/iavf_virtchnl.c | 37 +++++++++++++------\n> 3 files changed, 32 insertions(+), 15 deletions(-)\n> \n> diff --git a/drivers/net/ethernet/intel/iavf/iavf.h\n> b/drivers/net/ethernet/intel/iavf/iavf.h\n> index 1ad00690622c8e..f9ad814d18b1da 100644\n> --- a/drivers/net/ethernet/intel/iavf/iavf.h\n> +++ b/drivers/net/ethernet/intel/iavf/iavf.h\n> @@ -161,6 +161,7 @@ enum iavf_vlan_state_t {\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=Jfuou4wx;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::136; 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