From patchwork Thu Sep 16 15:44:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 513502 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD644C433FE for ; Thu, 16 Sep 2021 15:44:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A43026124D for ; Thu, 16 Sep 2021 15:44:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238910AbhIPPqC (ORCPT ); Thu, 16 Sep 2021 11:46:02 -0400 Received: from smtp-relay-canonical-1.canonical.com ([185.125.188.121]:33056 "EHLO smtp-relay-canonical-1.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231702AbhIPPp4 (ORCPT ); Thu, 16 Sep 2021 11:45:56 -0400 Received: from HP-EliteBook-840-G7.. (1-171-209-135.dynamic-ip.hinet.net [1.171.209.135]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 8B114412AC; Thu, 16 Sep 2021 15:44:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1631807075; bh=R1Vt6j76+tfJTpRebzXGf6da6nGIfcE2GPxSs6Ets98=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=hkrlLC+rxhYeV9HCe8JCTimSwtyAnFbiGg0902pEI4zoyzRT2SQLVzAAOLMS/wdcD z1YNVA8le1BaTBm0PCo1QQfAIwYhQeWuK+wg3J1mpbt/FXNvv3L0IbnMwT6+3swX02 HPI2NSpEKPj38qf2IZXSwjGhRFqXTGk6Q9YgMMfcD7rhCEW7ofMqF0w9egPOlZtAiB erY96ycIpUGSoR8CLAqdoxJYSuHo0W+Bv67/dKTJ91ctMvKpmSXWs3QtL7QNUpbQPQ gyiDGz2yvhv6lVY67Y/Y08wVATz9YbPVr/x/eUWrUVu87fGjtSBH/GAyjEZvOPPh+0 JqZw7efV/rcUw== From: Kai-Heng Feng To: hkallweit1@gmail.com, nic_swsd@realtek.com, bhelgaas@google.com Cc: davem@davemloft.net, kuba@kernel.org, anthony.wong@canonical.com, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Kai-Heng Feng , "Saheed O. Bolarinwa" , Vidya Sagar , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?b?xYRza2k=?= Subject: [RFC] [PATCH net-next v5 1/3] PCI/ASPM: Introduce a new helper to report ASPM capability Date: Thu, 16 Sep 2021 23:44:15 +0800 Message-Id: <20210916154417.664323-2-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210916154417.664323-1-kai.heng.feng@canonical.com> References: <20210916154417.664323-1-kai.heng.feng@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Introduce a new helper, pcie_aspm_capable(), to report ASPM capability. The user will be introduced by next patch. Signed-off-by: Kai-Heng Feng --- v5: - No change. v4: - Report aspm_capable instead. v3: - This is a new patch drivers/pci/pcie/aspm.c | 11 +++++++++++ include/linux/pci.h | 2 ++ 2 files changed, 13 insertions(+) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 013a47f587cea..788e7496f33b1 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -1201,6 +1201,17 @@ bool pcie_aspm_enabled(struct pci_dev *pdev) } EXPORT_SYMBOL_GPL(pcie_aspm_enabled); +bool pcie_aspm_capable(struct pci_dev *pdev) +{ + struct pcie_link_state *link = pcie_aspm_get_link(pdev); + + if (!link) + return false; + + return link->aspm_capable; +} +EXPORT_SYMBOL_GPL(pcie_aspm_capable); + static ssize_t aspm_attr_show_common(struct device *dev, struct device_attribute *attr, char *buf, u8 state) diff --git a/include/linux/pci.h b/include/linux/pci.h index 34d7d94ddf6dc..d77919d125af1 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1631,6 +1631,7 @@ int pci_disable_link_state_locked(struct pci_dev *pdev, int state); void pcie_no_aspm(void); bool pcie_aspm_support_enabled(void); bool pcie_aspm_enabled(struct pci_dev *pdev); +bool pcie_aspm_capable(struct pci_dev *pdev); #else static inline int pci_disable_link_state(struct pci_dev *pdev, int state) { return 0; } @@ -1639,6 +1640,7 @@ static inline int pci_disable_link_state_locked(struct pci_dev *pdev, int state) static inline void pcie_no_aspm(void) { } static inline bool pcie_aspm_support_enabled(void) { return false; } static inline bool pcie_aspm_enabled(struct pci_dev *pdev) { return false; } +static inline bool pcie_aspm_capable(struct pci_dev *pdev) { return false; } #endif #ifdef CONFIG_PCIEAER From patchwork Thu Sep 16 15:44:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 513501 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 99921C433FE for ; Thu, 16 Sep 2021 15:44:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7D0176120E for ; Thu, 16 Sep 2021 15:44:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239894AbhIPPqJ (ORCPT ); Thu, 16 Sep 2021 11:46:09 -0400 Received: from smtp-relay-canonical-1.canonical.com ([185.125.188.121]:33106 "EHLO smtp-relay-canonical-1.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239309AbhIPPqF (ORCPT ); Thu, 16 Sep 2021 11:46:05 -0400 Received: from HP-EliteBook-840-G7.. (1-171-209-135.dynamic-ip.hinet.net [1.171.209.135]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 2D97241337; Thu, 16 Sep 2021 15:44:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1631807083; bh=LvsEOQzKp932y4GbsUx/YluaBhXdBn4DLLIYXB/gwho=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=kYVgKNQIFRmrly8f46nOQLdb4pLhuS2p6BaBAcEP5jSpaZBlisvF03pZC4qd2xWTE d+I5owt2hRu7RjTGjNv3ISp/2FVAc7Y7cHx1/O8aawps0gSsrxotCJ0+udIg4yIXvH bcN9MB9UDHg2ZdF500WH9dgBX8RMiekNL6dJKV3w9BE5cXoDxITqoMh+J+ZdnPGM7r JXKRSlqpdOFtIxL9AT8jjghkmtDc29s4AW5Y8XFwgfDxLYY2LPVs5Lsb97gZmhzr1I k1NfyYFjZy7DDqFNtqveNP5yDn2cq10vP1vdexquGm5/LKy3m5Inuz4xWfE1xpAjY8 +Ygs/9EjH4M8Q== From: Kai-Heng Feng To: hkallweit1@gmail.com, nic_swsd@realtek.com, bhelgaas@google.com Cc: davem@davemloft.net, kuba@kernel.org, anthony.wong@canonical.com, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Kai-Heng Feng Subject: [RFC] [PATCH net-next v5 3/3] r8169: Implement dynamic ASPM mechanism Date: Thu, 16 Sep 2021 23:44:17 +0800 Message-Id: <20210916154417.664323-4-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210916154417.664323-1-kai.heng.feng@canonical.com> References: <20210916154417.664323-1-kai.heng.feng@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org r8169 NICs on some platforms have abysmal speed when ASPM is enabled. Same issue can be observed with older vendor drivers. The issue is however solved by the latest vendor driver. There's a new mechanism, which disables r8169's internal ASPM when the NIC traffic has more than 10 packets, and vice versa. The possible reason for this is likely because the buffer on the chip is too small for its ASPM exit latency. Realtek confirmed that all their PCIe LAN NICs, r8106, r8168 and r8125 use dynamic ASPM under Windows. So implement the same mechanism here to resolve the issue. Also introduce a lock to prevent race on accessing config registers. Signed-off-by: Kai-Heng Feng --- v5: - Split out aspm_manageable replacement as another patch. - Introduce a lock for lock_config_regs() and unlock_config_regs(). v4: - Squash two patches - Remove aspm_manageable and use pcie_aspm_capable() pcie_aspm_enabled() accordingly v3: - Use msecs_to_jiffies() for delay time - Use atomic_t instead of mutex for bh - Mention the buffer size and ASPM exit latency in commit message v2: - Use delayed_work instead of timer_list to avoid interrupt context - Use mutex to serialize packet counter read/write - Wording change drivers/net/ethernet/realtek/r8169_main.c | 58 +++++++++++++++++++++-- 1 file changed, 53 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c index 6f1a9bec40c05..0994967aa971f 100644 --- a/drivers/net/ethernet/realtek/r8169_main.c +++ b/drivers/net/ethernet/realtek/r8169_main.c @@ -622,6 +622,11 @@ struct rtl8169_private { } wk; unsigned supports_gmii:1; + unsigned rtl_aspm_enabled:1; + struct delayed_work aspm_toggle; + atomic_t aspm_packet_count; + struct mutex config_lock; + dma_addr_t counters_phys_addr; struct rtl8169_counters *counters; struct rtl8169_tc_offsets tc_offset; @@ -670,12 +675,14 @@ static inline struct device *tp_to_dev(struct rtl8169_private *tp) static void rtl_lock_config_regs(struct rtl8169_private *tp) { + mutex_lock(&tp->config_lock); RTL_W8(tp, Cfg9346, Cfg9346_Lock); } static void rtl_unlock_config_regs(struct rtl8169_private *tp) { RTL_W8(tp, Cfg9346, Cfg9346_Unlock); + mutex_unlock(&tp->config_lock); } static void rtl_pci_commit(struct rtl8169_private *tp) @@ -2669,6 +2676,8 @@ static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable) if (!pcie_aspm_enabled(pdev) && enable) return; + tp->rtl_aspm_enabled = enable; + if (enable) { RTL_W8(tp, Config5, RTL_R8(tp, Config5) | ASPM_en); RTL_W8(tp, Config2, RTL_R8(tp, Config2) | ClkReqEn); @@ -4407,6 +4416,7 @@ static void rtl_tx(struct net_device *dev, struct rtl8169_private *tp, dirty_tx = tp->dirty_tx; + atomic_add(tp->cur_tx - dirty_tx, &tp->aspm_packet_count); while (READ_ONCE(tp->cur_tx) != dirty_tx) { unsigned int entry = dirty_tx % NUM_TX_DESC; u32 status; @@ -4551,6 +4561,8 @@ static int rtl_rx(struct net_device *dev, struct rtl8169_private *tp, int budget rtl8169_mark_to_asic(desc); } + atomic_add(count, &tp->aspm_packet_count); + return count; } @@ -4658,8 +4670,39 @@ static int r8169_phy_connect(struct rtl8169_private *tp) return 0; } +#define ASPM_PACKET_THRESHOLD 10 +#define ASPM_TOGGLE_INTERVAL 1000 + +static void rtl8169_aspm_toggle(struct work_struct *work) +{ + struct rtl8169_private *tp = container_of(work, struct rtl8169_private, + aspm_toggle.work); + int packet_count; + bool enable; + + packet_count = atomic_xchg(&tp->aspm_packet_count, 0); + + if (pcie_aspm_enabled(tp->pci_dev)) { + enable = packet_count <= ASPM_PACKET_THRESHOLD; + + if (tp->rtl_aspm_enabled != enable) { + rtl_unlock_config_regs(tp); + rtl_hw_aspm_clkreq_enable(tp, enable); + rtl_lock_config_regs(tp); + } + } else if (tp->rtl_aspm_enabled) { + rtl_unlock_config_regs(tp); + rtl_hw_aspm_clkreq_enable(tp, false); + rtl_lock_config_regs(tp); + } + + schedule_delayed_work(&tp->aspm_toggle, msecs_to_jiffies(ASPM_TOGGLE_INTERVAL)); +} + static void rtl8169_down(struct rtl8169_private *tp) { + cancel_delayed_work_sync(&tp->aspm_toggle); + /* Clear all task flags */ bitmap_zero(tp->wk.flags, RTL_FLAG_MAX); @@ -4686,6 +4729,10 @@ static void rtl8169_up(struct rtl8169_private *tp) rtl_reset_work(tp); phy_start(tp->phydev); + + /* pcie_aspm_capable may change after system resume */ + if (pcie_aspm_support_enabled() && pcie_aspm_capable(tp->pci_dev)) + schedule_delayed_work(&tp->aspm_toggle, 0); } static int rtl8169_close(struct net_device *dev) @@ -5273,11 +5320,6 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) if (rc) return rc; - /* Disable ASPM L1 as that cause random device stop working - * problems as well as full system hangs for some PCIe devices users. - */ - pci_disable_link_state(pdev, PCIE_LINK_STATE_L1); - /* enable device (incl. PCI PM wakeup and hotplug setup) */ rc = pcim_enable_device(pdev); if (rc < 0) { @@ -5307,6 +5349,8 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) return rc; } + mutex_init(&tp->config_lock); + tp->mmio_addr = pcim_iomap_table(pdev)[region]; xid = (RTL_R32(tp, TxConfig) >> 20) & 0xfcf; @@ -5344,6 +5388,10 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) INIT_WORK(&tp->wk.work, rtl_task); + INIT_DELAYED_WORK(&tp->aspm_toggle, rtl8169_aspm_toggle); + + atomic_set(&tp->aspm_packet_count, 0); + rtl_init_mac_address(tp); dev->ethtool_ops = &rtl8169_ethtool_ops;