From patchwork Thu Aug 19 05:45:40 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: 12446265 X-Patchwork-Delegate: bhelgaas@google.com 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=ham 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 6EBA9C4338F for ; Thu, 19 Aug 2021 05:46:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 42E6C6112E for ; Thu, 19 Aug 2021 05:46:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230016AbhHSFqq (ORCPT ); Thu, 19 Aug 2021 01:46:46 -0400 Received: from smtp-relay-canonical-0.canonical.com ([185.125.188.120]:39412 "EHLO smtp-relay-canonical-0.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229998AbhHSFqp (ORCPT ); Thu, 19 Aug 2021 01:46:45 -0400 Received: from localhost.localdomain (1-171-223-154.dynamic-ip.hinet.net [1.171.223.154]) (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-0.canonical.com (Postfix) with ESMTPSA id D6965411BC; Thu, 19 Aug 2021 05:46:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1629351966; bh=QdizpEE7M+xdJvzFRIpo7bvWSKswgDq1vyuyBjROpYk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=kccgw9IjTLcQdwGb8aPTcxHwRXd0AmcjjoEcnlgfXD+snpgt56AFgAgI+Ckz7t2BN 2cNOxT63UDqrRvRef3AcgtoH0rNpYduGRoP38DLxXzwic7mewWI/9guJCLlYR1RF+d JoSVRc0of99h4Sdm28ckaCzgaHDSK9VBcmmDolXynokwcIQjwcfw0dIgRo5iXLHUFZ 09XcVtroVm3XmI7LcNOGtpvrvBQb/LMgoea4G9Y0x6JJ60VMgTquLEvH8AQFlICXUE t8FByD3j4KXlx80QM9eaYLjm3JY21Wf3IZWajFtpm0ReC7u3gqGrljzxWzkNunmyV+ uj6xpIaQ1qp+w== From: Kai-Heng Feng To: hkallweit1@gmail.com, nic_swsd@realtek.com, bhelgaas@google.com Cc: davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Kai-Heng Feng Subject: [PATCH net-next v3 1/3] r8169: Implement dynamic ASPM mechanism Date: Thu, 19 Aug 2021 13:45:40 +0800 Message-Id: <20210819054542.608745-2-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210819054542.608745-1-kai.heng.feng@canonical.com> References: <20210819054542.608745-1-kai.heng.feng@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@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. Signed-off-by: Kai-Heng Feng --- 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 | 44 ++++++++++++++++++++++- 1 file changed, 43 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c index 7a69b468584a2..3359509c1c351 100644 --- a/drivers/net/ethernet/realtek/r8169_main.c +++ b/drivers/net/ethernet/realtek/r8169_main.c @@ -624,6 +624,10 @@ struct rtl8169_private { unsigned supports_gmii:1; unsigned aspm_manageable:1; + unsigned rtl_aspm_enabled:1; + struct delayed_work aspm_toggle; + atomic_t aspm_packet_count; + dma_addr_t counters_phys_addr; struct rtl8169_counters *counters; struct rtl8169_tc_offsets tc_offset; @@ -2665,8 +2669,13 @@ static void rtl_pcie_state_l2l3_disable(struct rtl8169_private *tp) static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable) { + if (!tp->aspm_manageable && enable) + return; + + tp->rtl_aspm_enabled = enable; + /* Don't enable ASPM in the chip if OS can't control ASPM */ - if (enable && tp->aspm_manageable) { + if (enable) { RTL_W8(tp, Config5, RTL_R8(tp, Config5) | ASPM_en); RTL_W8(tp, Config2, RTL_R8(tp, Config2) | ClkReqEn); } else { @@ -4415,6 +4424,7 @@ 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; @@ -4559,6 +4569,8 @@ 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; } @@ -4666,8 +4678,32 @@ 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); + 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); + } + + 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); @@ -4694,6 +4730,8 @@ static void rtl8169_up(struct rtl8169_private *tp) rtl_reset_work(tp); phy_start(tp->phydev); + + schedule_delayed_work(&tp->aspm_toggle, msecs_to_jiffies(ASPM_TOGGLE_INTERVAL)); } static int rtl8169_close(struct net_device *dev) @@ -5354,6 +5392,10 @@ 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; From patchwork Thu Aug 19 05:45:41 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: 12446269 X-Patchwork-Delegate: bhelgaas@google.com 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=ham 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 BF3B2C4338F for ; Thu, 19 Aug 2021 05:46:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A3C096101A for ; Thu, 19 Aug 2021 05:46:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230494AbhHSFq4 (ORCPT ); Thu, 19 Aug 2021 01:46:56 -0400 Received: from smtp-relay-canonical-0.canonical.com ([185.125.188.120]:39428 "EHLO smtp-relay-canonical-0.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230274AbhHSFqt (ORCPT ); Thu, 19 Aug 2021 01:46:49 -0400 Received: from localhost.localdomain (1-171-223-154.dynamic-ip.hinet.net [1.171.223.154]) (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-0.canonical.com (Postfix) with ESMTPSA id A35A4411C4; Thu, 19 Aug 2021 05:46:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1629351972; bh=amXsjTc2Jlr4vNYCJIJwZjbkzL6BAOEgx/TBHMTR6cU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=mu+BQpZyR3+QvkVIR2cDQdg/SvVpzcb8qsEE9hzA7aTxTTsnfkzzm43OG91Ma+YL0 +heO9NHlrNFASy3WSyc/lfSHiXFMxB2HjwwbDvCTfyGKSxTfd1WmX0ROFw7VFB1Tvn dXeopEWwfpzfqPEFHOlaOg8nJ1uZ7s8B86FDPUKtYNgwRqn/DvU5K465hsCDjuy0wM 8OrEJN9L0L2CLiSzIl0WGMDo/X7gFb+g7PKm9Jepzw+y1JvErSCOhjaNIUP1MdumEQ 9rkanQ0Km/a+Px0wSeEfviGC3HTCyBzSijegzyZtxT0g2YFmk48QlBJd9hLKZNzTdL 0kfu76tamzPsw== From: Kai-Heng Feng To: hkallweit1@gmail.com, nic_swsd@realtek.com, bhelgaas@google.com Cc: davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Kai-Heng Feng , "Saheed O. Bolarinwa" , Vidya Sagar , Logan Gunthorpe , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= Subject: [PATCH net-next v3 2/3] PCI/ASPM: Introduce a new helper to report ASPM support status Date: Thu, 19 Aug 2021 13:45:41 +0800 Message-Id: <20210819054542.608745-3-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210819054542.608745-1-kai.heng.feng@canonical.com> References: <20210819054542.608745-1-kai.heng.feng@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Introduce a new helper, pcie_aspm_supported(), to report ASPM support status. The user will be introduced by next patch. Signed-off-by: Kai-Heng Feng --- 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..eeea6a04ab0cf 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_supported(struct pci_dev *pdev) +{ + struct pcie_link_state *link = pcie_aspm_get_link(pdev); + + if (!link) + return false; + + return link->aspm_support; +} +EXPORT_SYMBOL_GPL(pcie_aspm_supported); + 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 540b377ca8f61..b7b71982f2405 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1602,6 +1602,7 @@ 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_supported(struct pci_dev *pdev); #else static inline int pci_disable_link_state(struct pci_dev *pdev, int state) { return 0; } @@ -1610,6 +1611,7 @@ 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_supported(struct pci_dev *pdev) { return false; } #endif #ifdef CONFIG_PCIEAER From patchwork Thu Aug 19 05:45:42 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: 12446271 X-Patchwork-Delegate: bhelgaas@google.com 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=ham 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 A3D0EC4338F for ; Thu, 19 Aug 2021 05:46:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8A280610F7 for ; Thu, 19 Aug 2021 05:46:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230483AbhHSFq6 (ORCPT ); Thu, 19 Aug 2021 01:46:58 -0400 Received: from smtp-relay-canonical-0.canonical.com ([185.125.188.120]:39452 "EHLO smtp-relay-canonical-0.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230416AbhHSFqy (ORCPT ); Thu, 19 Aug 2021 01:46:54 -0400 Received: from localhost.localdomain (1-171-223-154.dynamic-ip.hinet.net [1.171.223.154]) (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-0.canonical.com (Postfix) with ESMTPSA id C0EFC40C9D; Thu, 19 Aug 2021 05:46:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1629351976; bh=6GWWIzDjc4L/ju2yv/2mn2NZsjtrX1blIUII0KdOUHk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=NtTBMkjwyfC9vlN74FGQtPNy6t9Y/dC4HSx2gRgzQfuZV6OnE85fLn5CiFeKmXb3Y RftilwgFybmWLvXBR/nZFEhl8f5EPEKOzrdkURBWDruOATKRctRvXrILDtD4JzggLE FfUwob32NFd+EuKv+pz7jtSrs685ijIoAS4pTeWR3rxk/BwhHvMHbdypzzbT1gVrBS 3//E98xG0vdbxTRkLXIWnh8V7BfuzgruCNTOZ3BXiMmI6OsJNUuGjAXSQv0xDs2t0G /CCIi0Q/HbxuBwIlrbPwoEYl7XF9cQTbC4QbmBa0a81RwTPcsWmqvOvRrG2XA0LrQq tyO6M71igyfMQ== From: Kai-Heng Feng To: hkallweit1@gmail.com, nic_swsd@realtek.com, bhelgaas@google.com Cc: davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Kai-Heng Feng Subject: [PATCH net-next v3 3/3] r8169: Enable ASPM for selected NICs Date: Thu, 19 Aug 2021 13:45:42 +0800 Message-Id: <20210819054542.608745-4-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210819054542.608745-1-kai.heng.feng@canonical.com> References: <20210819054542.608745-1-kai.heng.feng@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The latest vendor driver enables ASPM for more recent r8168 NICs, so disable ASPM on older chips and enable ASPM for the rest. Rename aspm_manageable to pcie_aspm_manageable to indicate it's ASPM from PCIe, and use rtl_aspm_supported for Realtek NIC's internal ASPM function. Signed-off-by: Kai-Heng Feng --- v3: - Use pcie_aspm_supported() to retrieve ASPM support status - Use whitelist for r8169 internal ASPM status v2: - No change drivers/net/ethernet/realtek/r8169_main.c | 27 ++++++++++++++++------- 1 file changed, 19 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c index 3359509c1c351..88e015d93e490 100644 --- a/drivers/net/ethernet/realtek/r8169_main.c +++ b/drivers/net/ethernet/realtek/r8169_main.c @@ -623,7 +623,8 @@ struct rtl8169_private { } wk; unsigned supports_gmii:1; - unsigned aspm_manageable:1; + unsigned pcie_aspm_manageable:1; + unsigned rtl_aspm_supported:1; unsigned rtl_aspm_enabled:1; struct delayed_work aspm_toggle; atomic_t aspm_packet_count; @@ -702,6 +703,20 @@ static bool rtl_is_8168evl_up(struct rtl8169_private *tp) tp->mac_version <= RTL_GIGA_MAC_VER_53; } +static int rtl_supports_aspm(struct rtl8169_private *tp) +{ + switch (tp->mac_version) { + case RTL_GIGA_MAC_VER_02 ... RTL_GIGA_MAC_VER_31: + case RTL_GIGA_MAC_VER_37: + case RTL_GIGA_MAC_VER_39: + case RTL_GIGA_MAC_VER_43: + case RTL_GIGA_MAC_VER_47: + return 0; + default: + return 1; + } +} + static bool rtl_supports_eee(struct rtl8169_private *tp) { return tp->mac_version >= RTL_GIGA_MAC_VER_34 && @@ -2669,7 +2684,7 @@ static void rtl_pcie_state_l2l3_disable(struct rtl8169_private *tp) static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable) { - if (!tp->aspm_manageable && enable) + if (!(tp->pcie_aspm_manageable && tp->rtl_aspm_supported) && enable) return; tp->rtl_aspm_enabled = enable; @@ -5319,12 +5334,8 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) if (rc) return rc; - /* Disable ASPM completely as that cause random device stop working - * problems as well as full system hangs for some PCIe devices users. - */ - rc = pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | - PCIE_LINK_STATE_L1); - tp->aspm_manageable = !rc; + tp->pcie_aspm_manageable = pcie_aspm_supported(pdev); + tp->rtl_aspm_supported = rtl_supports_aspm(tp); /* enable device (incl. PCI PM wakeup and hotplug setup) */ rc = pcim_enable_device(pdev);