From patchwork Wed Aug 14 17:33:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Nguyen X-Patchwork-Id: 13763783 X-Patchwork-Delegate: kuba@kernel.org Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7C9A61BD513 for ; Wed, 14 Aug 2024 17:33:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723656812; cv=none; b=PT3LA1+AglAoE9yKZ4r+ZWVL3PaLef2teD9xGiZDdWwaG9JrP8OYsgYeHQ+4dC4NPg4Jj1GnF2pUwi2/T+2ulkzv6P7NHVqPfxHxhc5zMRigOl3in9e2CwADY0raIHyCOncAhMUvgVrtv1CuaXkp3X81CiIZwHyJCJoshVDJYpI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723656812; c=relaxed/simple; bh=4/L4L/7a9MyPDfM+8TBOjxaevxQR4ECawGpSWvOG/BU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WIMJdoA0kpolNVRH2NTO10r5PPPBAyiOFblzUhdRggmA6xrDAJUQargoW7pa/ABBmT380jYZ4jEx2HNjnHsClawLHqiDW0nL53rs0WUklIlYC9nLnriovEkcafb44x+TFeA4z/XJBp8iRle4q6b1oXWTgnwNe6dnDF5PGl+ZVF8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=auUW4v2X; arc=none smtp.client-ip=198.175.65.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="auUW4v2X" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1723656810; x=1755192810; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=4/L4L/7a9MyPDfM+8TBOjxaevxQR4ECawGpSWvOG/BU=; b=auUW4v2XuLqv7xRILzJ1VcgFpM6QCVRJ3NIe+x8YDc08Lko5NBJhi1NR mjdUTPfoSmfbcm9FooHkba3jFc1OdnbD9ihiz/6v7sihwKvI9793Tihdu dN5ODaaT6LcXvMsFMlTVoZDM78JGSPhEAAe7fEu0lC54t3in4My6T5wxO g24CTbb+RMzgHutPxHglY5RSQK2zKbTnOO+QitZFr3XIaKAVXxEtOYxMX TzMioQ6CrUzFmXP65oUSwNLtspy0JQITKgTE5mWlkkfOKOauMyt1xAc2R HCgG5prk/q53kj9NxK5eITM1neTJCky4GRi2m4VBR6gDBL3ut/nqb4ibC w==; X-CSE-ConnectionGUID: VicMegdKTKWcdbL9gTfJJQ== X-CSE-MsgGUID: Z8igepIGTyeTTuZ3M1nVKg== X-IronPort-AV: E=McAfee;i="6700,10204,11164"; a="21860600" X-IronPort-AV: E=Sophos;i="6.10,146,1719903600"; d="scan'208";a="21860600" Received: from fmviesa010.fm.intel.com ([10.60.135.150]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Aug 2024 10:33:26 -0700 X-CSE-ConnectionGUID: X/FBf+nuQG2wGXQQoFrsDA== X-CSE-MsgGUID: Uf3NA0d3TVqUJqjuZugc+g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,146,1719903600"; d="scan'208";a="59233881" Received: from anguy11-upstream.jf.intel.com ([10.166.9.133]) by fmviesa010.fm.intel.com with ESMTP; 14 Aug 2024 10:33:26 -0700 From: Tony Nguyen To: davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com, netdev@vger.kernel.org Cc: Joshua Hay , anthony.l.nguyen@intel.com, aleksander.lobakin@intel.com, przemyslaw.kitszel@intel.com, michal.kubiak@intel.com, nex.sw.ncis.osdt.itp.upstreaming@intel.com Subject: [PATCH net-next 8/9] idpf: enable WB_ON_ITR Date: Wed, 14 Aug 2024 10:33:05 -0700 Message-ID: <20240814173309.4166149-9-anthony.l.nguyen@intel.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240814173309.4166149-1-anthony.l.nguyen@intel.com> References: <20240814173309.4166149-1-anthony.l.nguyen@intel.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org From: Joshua Hay Tell hardware to write back completed descriptors even when interrupts are disabled. Otherwise, descriptors might not be written back until the hardware can flush a full cacheline of descriptors. This can cause unnecessary delays when traffic is light (or even trigger Tx queue timeout). The example scenario to reproduce the Tx timeout if the fix is not applied: - configure at least 2 Tx queues to be assigned to the same q_vector, - generate a huge Tx traffic on the first Tx queue - try to send a few packets using the second Tx queue. In such a case Tx timeout will appear on the second Tx queue because no completion descriptors are written back for that queue while interrupts are disabled due to NAPI polling. Fixes: c2d548cad150 ("idpf: add TX splitq napi poll support") Fixes: a5ab9ee0df0b ("idpf: add singleq start_xmit and napi poll") Signed-off-by: Joshua Hay Co-developed-by: Michal Kubiak Signed-off-by: Michal Kubiak Reviewed-by: Przemek Kitszel Signed-off-by: Alexander Lobakin Signed-off-by: Tony Nguyen --- drivers/net/ethernet/intel/idpf/idpf_dev.c | 2 ++ .../ethernet/intel/idpf/idpf_singleq_txrx.c | 6 ++++- drivers/net/ethernet/intel/idpf/idpf_txrx.c | 7 ++++- drivers/net/ethernet/intel/idpf/idpf_txrx.h | 27 ++++++++++++++++++- drivers/net/ethernet/intel/idpf/idpf_vf_dev.c | 2 ++ 5 files changed, 41 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/intel/idpf/idpf_dev.c b/drivers/net/ethernet/intel/idpf/idpf_dev.c index 3df9935685e9..6c913a703df6 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_dev.c +++ b/drivers/net/ethernet/intel/idpf/idpf_dev.c @@ -97,8 +97,10 @@ static int idpf_intr_reg_init(struct idpf_vport *vport) intr->dyn_ctl = idpf_get_reg_addr(adapter, reg_vals[vec_id].dyn_ctl_reg); intr->dyn_ctl_intena_m = PF_GLINT_DYN_CTL_INTENA_M; + intr->dyn_ctl_intena_msk_m = PF_GLINT_DYN_CTL_INTENA_MSK_M; intr->dyn_ctl_itridx_s = PF_GLINT_DYN_CTL_ITR_INDX_S; intr->dyn_ctl_intrvl_s = PF_GLINT_DYN_CTL_INTERVAL_S; + intr->dyn_ctl_wb_on_itr_m = PF_GLINT_DYN_CTL_WB_ON_ITR_M; spacing = IDPF_ITR_IDX_SPACING(reg_vals[vec_id].itrn_index_spacing, IDPF_PF_ITR_IDX_SPACING); diff --git a/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c index 5ba360abbe66..dfd7cf1d9aa0 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c +++ b/drivers/net/ethernet/intel/idpf/idpf_singleq_txrx.c @@ -1120,8 +1120,10 @@ int idpf_vport_singleq_napi_poll(struct napi_struct *napi, int budget) &work_done); /* If work not completed, return budget and polling will return */ - if (!clean_complete) + if (!clean_complete) { + idpf_vport_intr_set_wb_on_itr(q_vector); return budget; + } work_done = min_t(int, work_done, budget - 1); @@ -1130,6 +1132,8 @@ int idpf_vport_singleq_napi_poll(struct napi_struct *napi, int budget) */ if (likely(napi_complete_done(napi, work_done))) idpf_vport_intr_update_itr_ena_irq(q_vector); + else + idpf_vport_intr_set_wb_on_itr(q_vector); return work_done; } diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c index 60f875decd8a..c60f3f917226 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c @@ -3711,6 +3711,7 @@ void idpf_vport_intr_update_itr_ena_irq(struct idpf_q_vector *q_vector) /* net_dim() updates ITR out-of-band using a work item */ idpf_net_dim(q_vector); + q_vector->wb_on_itr = false; intval = idpf_vport_intr_buildreg_itr(q_vector, IDPF_NO_ITR_UPDATE_IDX, 0); @@ -4013,8 +4014,10 @@ static int idpf_vport_splitq_napi_poll(struct napi_struct *napi, int budget) clean_complete &= idpf_tx_splitq_clean_all(q_vector, budget, &work_done); /* If work not completed, return budget and polling will return */ - if (!clean_complete) + if (!clean_complete) { + idpf_vport_intr_set_wb_on_itr(q_vector); return budget; + } work_done = min_t(int, work_done, budget - 1); @@ -4023,6 +4026,8 @@ static int idpf_vport_splitq_napi_poll(struct napi_struct *napi, int budget) */ if (likely(napi_complete_done(napi, work_done))) idpf_vport_intr_update_itr_ena_irq(q_vector); + else + idpf_vport_intr_set_wb_on_itr(q_vector); /* Switch to poll mode in the tear-down path after sending disable * queues virtchnl message, as the interrupts will be disabled after diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.h b/drivers/net/ethernet/intel/idpf/idpf_txrx.h index df3574ac58c2..b4a87f8661a8 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.h +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.h @@ -349,9 +349,11 @@ struct idpf_vec_regs { * struct idpf_intr_reg * @dyn_ctl: Dynamic control interrupt register * @dyn_ctl_intena_m: Mask for dyn_ctl interrupt enable + * @dyn_ctl_intena_msk_m: Mask for dyn_ctl interrupt enable mask * @dyn_ctl_itridx_s: Register bit offset for ITR index * @dyn_ctl_itridx_m: Mask for ITR index * @dyn_ctl_intrvl_s: Register bit offset for ITR interval + * @dyn_ctl_wb_on_itr_m: Mask for WB on ITR feature * @rx_itr: RX ITR register * @tx_itr: TX ITR register * @icr_ena: Interrupt cause register offset @@ -360,9 +362,11 @@ struct idpf_vec_regs { struct idpf_intr_reg { void __iomem *dyn_ctl; u32 dyn_ctl_intena_m; + u32 dyn_ctl_intena_msk_m; u32 dyn_ctl_itridx_s; u32 dyn_ctl_itridx_m; u32 dyn_ctl_intrvl_s; + u32 dyn_ctl_wb_on_itr_m; void __iomem *rx_itr; void __iomem *tx_itr; void __iomem *icr_ena; @@ -383,6 +387,7 @@ struct idpf_intr_reg { * @intr_reg: See struct idpf_intr_reg * @napi: napi handler * @total_events: Number of interrupts processed + * @wb_on_itr: WB on ITR enabled or not * @tx_dim: Data for TX net_dim algorithm * @tx_itr_value: TX interrupt throttling rate * @tx_intr_mode: Dynamic ITR or not @@ -413,6 +418,7 @@ struct idpf_q_vector { __cacheline_group_begin_aligned(read_write); struct napi_struct napi; u16 total_events; + bool wb_on_itr; struct dim tx_dim; u16 tx_itr_value; @@ -431,7 +437,7 @@ struct idpf_q_vector { cpumask_var_t affinity_mask; __cacheline_group_end_aligned(cold); }; -libeth_cacheline_set_assert(struct idpf_q_vector, 104, +libeth_cacheline_set_assert(struct idpf_q_vector, 112, 424 + 2 * sizeof(struct dim), 8 + sizeof(cpumask_var_t)); @@ -989,6 +995,25 @@ static inline void idpf_tx_splitq_build_desc(union idpf_tx_flex_desc *desc, idpf_tx_splitq_build_flow_desc(desc, params, td_cmd, size); } +/** + * idpf_vport_intr_set_wb_on_itr - enable descriptor writeback on disabled interrupts + * @q_vector: pointer to queue vector struct + */ +static inline void idpf_vport_intr_set_wb_on_itr(struct idpf_q_vector *q_vector) +{ + struct idpf_intr_reg *reg; + + if (q_vector->wb_on_itr) + return; + + q_vector->wb_on_itr = true; + reg = &q_vector->intr_reg; + + writel(reg->dyn_ctl_wb_on_itr_m | reg->dyn_ctl_intena_msk_m | + (IDPF_NO_ITR_UPDATE_IDX << reg->dyn_ctl_itridx_s), + reg->dyn_ctl); +} + int idpf_vport_singleq_napi_poll(struct napi_struct *napi, int budget); void idpf_vport_init_num_qs(struct idpf_vport *vport, struct virtchnl2_create_vport *vport_msg); diff --git a/drivers/net/ethernet/intel/idpf/idpf_vf_dev.c b/drivers/net/ethernet/intel/idpf/idpf_vf_dev.c index 629cb5cb7c9f..99b8dbaf4225 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_vf_dev.c +++ b/drivers/net/ethernet/intel/idpf/idpf_vf_dev.c @@ -97,7 +97,9 @@ static int idpf_vf_intr_reg_init(struct idpf_vport *vport) intr->dyn_ctl = idpf_get_reg_addr(adapter, reg_vals[vec_id].dyn_ctl_reg); intr->dyn_ctl_intena_m = VF_INT_DYN_CTLN_INTENA_M; + intr->dyn_ctl_intena_msk_m = VF_INT_DYN_CTLN_INTENA_MSK_M; intr->dyn_ctl_itridx_s = VF_INT_DYN_CTLN_ITR_INDX_S; + intr->dyn_ctl_wb_on_itr_m = VF_INT_DYN_CTLN_WB_ON_ITR_M; spacing = IDPF_ITR_IDX_SPACING(reg_vals[vec_id].itrn_index_spacing, IDPF_VF_ITR_IDX_SPACING);