From patchwork Mon Sep 9 20:53:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Nguyen X-Patchwork-Id: 13797588 X-Patchwork-Delegate: kuba@kernel.org Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (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 CACF718B495 for ; Mon, 9 Sep 2024 20:53:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725915218; cv=none; b=GMS4Dmfp/5moB+h28msw1c3g8dn9GnyOOSCEMZeRRzophde83KO7xiJgGGjSj+mw5SgcqRZbw0gmpT8doWJdvVCk5udd137RPhV44m4/8sfK7Immz7gznc4as9H5j66hdLLFZtUNu89EygXGVAogYe2WkkjxCCMa7uoxwzW3Whw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725915218; c=relaxed/simple; bh=aOT6Yo+LM5hLRTCnjCG4n0m3JidcJrkQqMvare01qjk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dqOcbqswv8zxXdNDrIna5CDf39Q3UCMrcmm8WkqbRfsDULrwuhbhpSdYxBRyqV03beANRuMIJxqseSoodueG38VybZ8pSN9CmKQJNb11EyLZ+81dFn5vtK5axa6zTf44vra+szQQMswLUPLPWzQAJ0thPgSMSFNFvsEC46CwHZY= 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=Ep2BOXDl; arc=none smtp.client-ip=192.198.163.8 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="Ep2BOXDl" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1725915217; x=1757451217; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=aOT6Yo+LM5hLRTCnjCG4n0m3JidcJrkQqMvare01qjk=; b=Ep2BOXDlmB976W11u2qwQF2cqsUY1PExGy9OzJcfRgYpHzgR5UubRrQp TXyAqnkhBkiCX6qoV69CUBv3PuFotM4FNYychdeSyUGTQ5TolPR01/J9T Z3fO4oqMVz1x1FlmplJ9PCzTbwgrQ9mW11Zhu4KMO0e9KfhyJlybu6/Oq mMgw4dHAczeWEXHVqIP/J8Wrl6Fi5oiuKkEeYuPi2N2cwHnDxjEX+92Hx HYcHVp89mKkqm7m/d2FNjC4hq2OlAlnXV9+8ZYBqAuAGuBXeMa1fqdq6c NOQVnTS6OzBdW9Ld78/JqQGhEvz1uGwTuuTkyjX6xVK2Oa0LPO4dTmMg/ w==; X-CSE-ConnectionGUID: SJfzJo7FQgiNDpTgoXRE2w== X-CSE-MsgGUID: ex0aspYEQQiok3Q2Q1pePw== X-IronPort-AV: E=McAfee;i="6700,10204,11190"; a="42151271" X-IronPort-AV: E=Sophos;i="6.10,215,1719903600"; d="scan'208";a="42151271" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2024 13:53:35 -0700 X-CSE-ConnectionGUID: 8StOpbsPTg2HCztthZj6+w== X-CSE-MsgGUID: DJw5os6mSYmf+JJCWwrWJA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,215,1719903600"; d="scan'208";a="71194514" Received: from anguy11-upstream.jf.intel.com ([10.166.9.133]) by fmviesa005.fm.intel.com with ESMTP; 09 Sep 2024 13:53:34 -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, willemb@google.com Subject: [PATCH net-next v3 6/6] idpf: enable WB_ON_ITR Date: Mon, 9 Sep 2024 13:53:21 -0700 Message-ID: <20240909205323.3110312-7-anthony.l.nguyen@intel.com> X-Mailer: git-send-email 2.46.0.522.gc50d79eeffbf In-Reply-To: <20240909205323.3110312-1-anthony.l.nguyen@intel.com> References: <20240909205323.3110312-1-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 5d74f324bcd4..d4e6f0e10487 100644 --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c @@ -3715,6 +3715,7 @@ 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); @@ -4017,8 +4018,10 @@ 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); @@ -4027,6 +4030,8 @@ 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 33305de06975..f0537826f840 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: whether WB on ITR is enabled * @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)); @@ -987,6 +993,25 @@ 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);