[{"id":3674580,"web_url":"http://patchwork.ozlabs.org/comment/3674580/","msgid":"","list_archive_url":null,"date":"2026-04-08T06:37:12","subject":"Re: [Intel-wired-lan] [PATCH iwl-net 2/2] idpf: fix skb datapath\n queue based scheduling crashes and timeouts","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 Joshua Hay\n> Sent: Tuesday, April 7, 2026 1:33 AM\n> To: intel-wired-lan@lists.osuosl.org\n> Cc: netdev@vger.kernel.org\n> Subject: [Intel-wired-lan] [PATCH iwl-net 2/2] idpf: fix skb datapath\n> queue based scheduling crashes and timeouts\n> \n> The splitq Tx resource checks were assuming that the queues were using\n> flow based scheduling and checking the refillqs for free buffers.\n> However, the Tx refillqs are not allocated when using queue based\n> scheduling resulting in a NULL ptr dereference. Adjust the Tx resource\n> checks to only check available descriptor resources when using queue\n> based scheduling. Because queue based scheduling does not have any\n> notion of descriptor only completions, there cannot be any packets in\n> flight, meaning there is no need to check for pending completions.\n> \n> The driver also only supported 8 byte completion descriptors in the\n> skb datapath previously. However, currently the FW only supports 4\n> byte completion descriptors when using queue based scheduling. This\n> meant we were skipping over completions, resulting in Tx timeouts.\n> Add support to process both 4 and 8 byte completion descriptors,\n> depending on the scheduling mode. Cache the next_to_clean completion\n> descriptor in the completion queue struct, and fetch this descriptor\n> before the start of each cleaning loop. Access the next descriptor in\n> the loop by calculating the index based on raw byte count.\n> \n> Fixes: 0c3f135e840d (\"idpf: stop Tx if there are insufficient buffer\n> resources\")\n> Fixes: 1c325aac10a8 (\"idpf: configure resources for TX queues\")\n> Signed-off-by: Joshua Hay \n> Reviewed-by: Madhu Chittim \n> ---\n> drivers/net/ethernet/intel/idpf/idpf_txrx.c | 49 +++++++++++++-------\n> - drivers/net/ethernet/intel/idpf/idpf_txrx.h | 6 ++-\n> 2 files changed, 36 insertions(+), 19 deletions(-)\n> \n> diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c\n> b/drivers/net/ethernet/intel/idpf/idpf_txrx.c\n> index f6b3b15364ff..4fc0bb14c5b1 100644\n> --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c\n> +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c\n> @@ -270,11 +270,9 @@ static int idpf_tx_desc_alloc(const struct\n> idpf_vport *vport, static int idpf_compl_desc_alloc(const struct\n> idpf_vport *vport,\n> \t\t\t\t struct idpf_compl_queue *complq)\n> {\n\n...\n\n> \n> /**\n> * struct idpf_sw_queue\n> --\n> 2.39.2\n\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=f+VH+kUb;\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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intel-wired-lan@lists.osuosl.org\n> Cc: netdev@vger.kernel.org\n> Subject: Re: [Intel-wired-lan] [PATCH iwl-net 2/2] idpf: fix skb datapath queue\n> based scheduling crashes and timeouts\n> \n> \n> \n> > -----Original Message-----\n> > From: Intel-wired-lan On Behalf\n> > Of Joshua Hay\n> > Sent: Tuesday, April 7, 2026 1:33 AM\n> > To: intel-wired-lan@lists.osuosl.org\n> > Cc: netdev@vger.kernel.org\n> > Subject: [Intel-wired-lan] [PATCH iwl-net 2/2] idpf: fix skb datapath\n> > queue based scheduling crashes and timeouts\n> >\n> > The splitq Tx resource checks were assuming that the queues were using\n> > flow based scheduling and checking the refillqs for free buffers.\n> > However, the Tx refillqs are not allocated when using queue based\n> > scheduling resulting in a NULL ptr dereference. Adjust the Tx resource\n> > checks to only check available descriptor resources when using queue\n> > based scheduling. Because queue based scheduling does not have any\n> > notion of descriptor only completions, there cannot be any packets in\n> > flight, meaning there is no need to check for pending completions.\n> >\n> > The driver also only supported 8 byte completion descriptors in the\n> > skb datapath previously. However, currently the FW only supports 4\n> > byte completion descriptors when using queue based scheduling. This\n> > meant we were skipping over completions, resulting in Tx timeouts.\n> > Add support to process both 4 and 8 byte completion descriptors,\n> > depending on the scheduling mode. Cache the next_to_clean completion\n> > descriptor in the completion queue struct, and fetch this descriptor\n> > before the start of each cleaning loop. Access the next descriptor in\n> > the loop by calculating the index based on raw byte count.\n> >\n> > Fixes: 0c3f135e840d (\"idpf: stop Tx if there are insufficient buffer\n> > resources\")\n> > Fixes: 1c325aac10a8 (\"idpf: configure resources for TX queues\")\n> > Signed-off-by: Joshua Hay \n> > Reviewed-by: Madhu Chittim \n> > ---\n> > drivers/net/ethernet/intel/idpf/idpf_txrx.c | 49 +++++++++++++-------\n> > - drivers/net/ethernet/intel/idpf/idpf_txrx.h | 6 ++-\n> > 2 files changed, 36 insertions(+), 19 deletions(-)\n> >\n> > diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c\n> > b/drivers/net/ethernet/intel/idpf/idpf_txrx.c\n> > index f6b3b15364ff..4fc0bb14c5b1 100644\n> > --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c\n> > +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c\n> > @@ -270,11 +270,9 @@ static int idpf_tx_desc_alloc(const struct\n> > idpf_vport *vport, static int idpf_compl_desc_alloc(const struct\n> > idpf_vport *vport,\n> > \t\t\t\t struct idpf_compl_queue *complq) {\n> \n> ...\n> \n> >\n> > /**\n> > * struct idpf_sw_queue\n> > --\n> > 2.39.2\n> \n> \n> Reviewed-by: Aleksandr Loktionov \n\nTested-by: Samuel Salin ","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=c6+46Elf;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=140.211.166.136; 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