From patchwork Wed Aug 28 20:57:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Keller, Jacob E" X-Patchwork-Id: 13781936 X-Patchwork-Delegate: kuba@kernel.org Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.13]) (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 A60191AC8AF for ; Wed, 28 Aug 2024 20:57:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724878656; cv=none; b=GitxqnOCzvYZFK217w2nrHY61jpVh4vcbgRtn51QdsDPq4IV1I0ibc6r0PLALHrBBjxTZfamKTVX0wHeFQer7MeAKSqutomVuZbt5YO+X8u4Xnet0fh/fSeldtPN9A794vEIVLcCILkOpqtuXQci2PbWEeGHsaj+eqoQ2q/qkKs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724878656; c=relaxed/simple; bh=3StCIl9iRUheph9NqthsyQu4RQhBny1GfUuc1Bjb8QE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=PEI4pYu46KhHmRFn3RSw+hob2jwzabOlc2PMONRbFsFzRFG/Ct9+Xvc65F75oO5QquKkLgHY/f2pNiYOsvIPGlP6Xp0mEQTYl6qs5OoZ3i0BVqTDvfeFFrZV3dvFh/2bXc+k64GIpdqlOuE3Gdk0De8fNi9nElGvag8l48qlgeM= 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=WOj49pmB; arc=none smtp.client-ip=198.175.65.13 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="WOj49pmB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724878655; x=1756414655; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=3StCIl9iRUheph9NqthsyQu4RQhBny1GfUuc1Bjb8QE=; b=WOj49pmBdkD3GIMnY8iqsjYfnJCI4LgnG2tQ3lBGlKF2lDAgaNRkvLvm NAJAWyz4A34Mx88lfHlhcl9KUz2FbZirwi/dfiI3KyphrYzZOvoXQf3Ut TQKO6Dgz863HH3VeG83DRAA3M84OKdp5afVkajWIxZ3i/iwkfm/lBqVAa dIqInQ3QK92mzMn9ZwwMt1QkUMAAzI2p2+lvs0aC0aGEXl/gmL5SsL+Zw tXnX2goUr0zITyu6eG5cDv1zJeFpLaLMVxwm9T/GA9beQHH836dEGCUdE MU8TtlNe0cxs+L4gnjVZSZW7rpqhgG7wc7licSzt9f/abbCSAHM6nmRB8 Q==; X-CSE-ConnectionGUID: PoROD12CQLeYNx6dDsCcFQ== X-CSE-MsgGUID: qLA84ftxQY2+mOMbahtAAA== X-IronPort-AV: E=McAfee;i="6700,10204,11178"; a="34592619" X-IronPort-AV: E=Sophos;i="6.10,183,1719903600"; d="scan'208";a="34592619" Received: from orviesa008.jf.intel.com ([10.64.159.148]) by orvoesa105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Aug 2024 13:57:31 -0700 X-CSE-ConnectionGUID: g9HeQsFDQxiJTxbxMiycZg== X-CSE-MsgGUID: rCeAd+JRTSySexEXV26jFQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,183,1719903600"; d="scan'208";a="64049992" Received: from jekeller-desk.jf.intel.com ([10.166.241.20]) by orviesa008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Aug 2024 13:57:29 -0700 From: Jacob Keller Date: Wed, 28 Aug 2024 13:57:28 -0700 Subject: [PATCH iwl-next v2 12/13] ice: move prefetch enable to ice_setup_rx_ctx Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240828-e810-live-migration-jk-prep-ctx-functions-v2-12-558ab9e240f5@intel.com> References: <20240828-e810-live-migration-jk-prep-ctx-functions-v2-0-558ab9e240f5@intel.com> In-Reply-To: <20240828-e810-live-migration-jk-prep-ctx-functions-v2-0-558ab9e240f5@intel.com> To: Vladimir Oltean , netdev , Anthony Nguyen , Intel Wired LAN Cc: Przemek Kitszel X-Mailer: b4 0.14.0 X-Patchwork-Delegate: kuba@kernel.org The ice_write_rxq_ctx() function is responsible for programming the Rx Queue context into hardware. It receives the configuration in unpacked form via the ice_rlan_ctx structure. This function unconditionally modifies the context to set the prefetch enable bit. This was done by commit c31a5c25bb19 ("ice: Always set prefena when configuring an Rx queue"). Setting this bit makes sense, since prefetching descriptors is almost always the preferred behavior. However, the ice_write_rxq_ctx() function is not the place that actually defines the queue context. We initialize the Rx Queue context in ice_setup_rx_ctx(). It is surprising to have the Rx queue context changed by a function who's responsibility is to program the given context to hardware. Following the principle of least surprise, move the setting of the prefetch enable bit out of ice_write_rxq_ctx() and into the ice_setup_rx_ctx(). Signed-off-by: Jacob Keller Reviewed-by: Przemek Kitszel --- drivers/net/ethernet/intel/ice/ice_base.c | 3 +++ drivers/net/ethernet/intel/ice/ice_common.c | 9 +++------ 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c index 1881ce8105ca..3fe87a30c29e 100644 --- a/drivers/net/ethernet/intel/ice/ice_base.c +++ b/drivers/net/ethernet/intel/ice/ice_base.c @@ -453,6 +453,9 @@ static int ice_setup_rx_ctx(struct ice_rx_ring *ring) /* Rx queue threshold in units of 64 */ rlan_ctx.lrxqthresh = 1; + /* Enable descriptor prefetch */ + rlan_ctx.prefena = 1; + /* PF acts as uplink for switchdev; set flex descriptor with src_vsi * metadata and flags to allow redirecting to PR netdev */ diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c index 09a94c20e16d..67273e4af7ff 100644 --- a/drivers/net/ethernet/intel/ice/ice_common.c +++ b/drivers/net/ethernet/intel/ice/ice_common.c @@ -1495,14 +1495,13 @@ const struct ice_ctx_ele ice_rlan_ctx_info[] = { }; /** - * ice_write_rxq_ctx + * ice_write_rxq_ctx - Write Rx Queue context to hardware * @hw: pointer to the hardware structure * @rlan_ctx: pointer to the rxq context * @rxq_index: the index of the Rx queue * - * Converts rxq context from sparse to dense structure and then writes - * it to HW register space and enables the hardware to prefetch descriptors - * instead of only fetching them on demand + * Pack the sparse Rx Queue context into dense hardware format and write it + * into the HW register space. */ int ice_write_rxq_ctx(struct ice_hw *hw, struct ice_rlan_ctx *rlan_ctx, u32 rxq_index) @@ -1512,8 +1511,6 @@ int ice_write_rxq_ctx(struct ice_hw *hw, struct ice_rlan_ctx *rlan_ctx, if (!rlan_ctx) return -EINVAL; - rlan_ctx->prefena = 1; - ice_pack_rxq_ctx(rlan_ctx, ctx_buf); return ice_copy_rxq_ctx_to_hw(hw, ctx_buf, rxq_index);