From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELtVGzwT6MiaB+mEA+/2Gs06Nwfr7Pe4Wncd13kRRY5Saw5PKS5nQkDJjtIqaQszZGK292Lc ARC-Seal: i=1; a=rsa-sha256; t=1519981020; cv=none; d=google.com; s=arc-20160816; b=EBu2dg/8zEMClwu/azPGFNDmBDUbdal5UZmoSfS/j1TgeiMHrYJ0rJfWgQXRd4/rvp orOhCGXlsu3E6wRtfxlOnXn5h+VxnTzDFvGykcPxEB52LlzmV3RkC94SFDhWXyTeLSaR F2s88WRqcE++d7i2ZW1acdEnXZoh0+fDZzm5EQsMG987AOU7DXdmcF5zih4LNnC9o8ot +dXH2qFnpV6hYfoh7MP+q+rpqAZkMGQ485NTzqlasIT5+m8ZgYu7qS9TYHThx4K7N2+9 BtBbndTpi1YQuNaDJ7jD9/gNKsg11l092hzeMIUd4M08DTo+I66EHNijmRENaK3XpWQx 9uTg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=Bhvb0OYB0moPUXaYSduaHKfWNeeoxVOtuzQPeeaCRT0=; b=JINAbxqZDwUIjnxzjdmtaAcGVNGgQMOyd7wgdqD+dKN9mG9PdouBu4bEEsSdB2cTf3 2SMdzsh8I9kPtF1lCk9oxlcm4tCdwClyBpRM1SD+Z0xin+r+sA68Z6vyXt+xFLf6F1Xc DONPYMubuOQrcM/A9YuvFtHhmfX/VwLfYSiqzdPblSLNxj8KeF2PuaZeKsSwazzZmMeY n8rqW07l9gA1CK6EcOK2fYVbJ8BPhjcII3wdkC2kdygDi7/Nj5sh61mboaqxE9UWbKwf Ypk8mbYVzqV8va9XT9Leb6kj+nZe/Nl02X5r3Am6UAn42LtFDD/my6OVgIIhHB9h8p5D UNvg== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 83.175.124.243 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 83.175.124.243 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Siva Reddy Kallam , Michael Chan , "David S. Miller" , Sasha Levin Subject: [PATCH 4.9 27/56] tg3: Add workaround to restrict 5762 MRRS to 2048 Date: Fri, 2 Mar 2018 09:51:13 +0100 Message-Id: <20180302084450.957168665@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180302084449.568562222@linuxfoundation.org> References: <20180302084449.568562222@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1593815433008003046?= X-GMAIL-MSGID: =?utf-8?q?1593815619128842560?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Siva Reddy Kallam [ Upstream commit 4419bb1cedcda0272e1dc410345c5a1d1da0e367 ] One of AMD based server with 5762 hangs with jumbo frame traffic. This AMD platform has southbridge limitation which is restricting MRRS to 4000. As a work around, driver to restricts the MRRS to 2048 for this particular 5762 NX1 card. Signed-off-by: Siva Reddy Kallam Signed-off-by: Michael Chan Signed-off-by: David S. Miller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/broadcom/tg3.c | 10 ++++++++++ drivers/net/ethernet/broadcom/tg3.h | 4 ++++ 2 files changed, 14 insertions(+) --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -10049,6 +10049,16 @@ static int tg3_reset_hw(struct tg3 *tp, tw32(GRC_MODE, tp->grc_mode | val); + /* On one of the AMD platform, MRRS is restricted to 4000 because of + * south bridge limitation. As a workaround, Driver is setting MRRS + * to 2048 instead of default 4096. + */ + if (tp->pdev->subsystem_vendor == PCI_VENDOR_ID_DELL && + tp->pdev->subsystem_device == TG3PCI_SUBDEVICE_ID_DELL_5762) { + val = tr32(TG3PCI_DEV_STATUS_CTRL) & ~MAX_READ_REQ_MASK; + tw32(TG3PCI_DEV_STATUS_CTRL, val | MAX_READ_REQ_SIZE_2048); + } + /* Setup the timer prescalar register. Clock is always 66Mhz. */ val = tr32(GRC_MISC_CFG); val &= ~0xff; --- a/drivers/net/ethernet/broadcom/tg3.h +++ b/drivers/net/ethernet/broadcom/tg3.h @@ -95,6 +95,7 @@ #define TG3PCI_SUBDEVICE_ID_DELL_JAGUAR 0x0106 #define TG3PCI_SUBDEVICE_ID_DELL_MERLOT 0x0109 #define TG3PCI_SUBDEVICE_ID_DELL_SLIM_MERLOT 0x010a +#define TG3PCI_SUBDEVICE_ID_DELL_5762 0x07f0 #define TG3PCI_SUBVENDOR_ID_COMPAQ PCI_VENDOR_ID_COMPAQ #define TG3PCI_SUBDEVICE_ID_COMPAQ_BANSHEE 0x007c #define TG3PCI_SUBDEVICE_ID_COMPAQ_BANSHEE_2 0x009a @@ -280,6 +281,9 @@ #define TG3PCI_STD_RING_PROD_IDX 0x00000098 /* 64-bit */ #define TG3PCI_RCV_RET_RING_CON_IDX 0x000000a0 /* 64-bit */ /* 0xa8 --> 0xb8 unused */ +#define TG3PCI_DEV_STATUS_CTRL 0x000000b4 +#define MAX_READ_REQ_SIZE_2048 0x00004000 +#define MAX_READ_REQ_MASK 0x00007000 #define TG3PCI_DUAL_MAC_CTRL 0x000000b8 #define DUAL_MAC_CTRL_CH_MASK 0x00000003 #define DUAL_MAC_CTRL_ID 0x00000004