From patchwork Fri Jun 29 12:17:14 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rafal Kozik X-Patchwork-Id: 41959 X-Patchwork-Delegate: thomas@monjalon.net Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 378311B597; Fri, 29 Jun 2018 14:17:26 +0200 (CEST) Received: from mail-lf0-f66.google.com (mail-lf0-f66.google.com [209.85.215.66]) by dpdk.org (Postfix) with ESMTP id 484E71B592 for ; Fri, 29 Jun 2018 14:17:24 +0200 (CEST) Received: by mail-lf0-f66.google.com with SMTP id g21-v6so6651710lfb.4 for ; Fri, 29 Jun 2018 05:17:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=semihalf-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=wWNxw0r4wrgI9Kp+M4NlaTVhfNuYhqp7kmjUW/FoeEc=; b=RtaoyvrJiSyNjd/6pnpBle55XJLJFGeaREg8SmPw5cKR4Loy9MmEmdUQByKOEWRtMk wRHIgpY16dQ4evukNDaTlIeQ1VH4CetzykY43JXOYlY/MwlyygHpXUQKnNXPvOvvvGQF +lh8BnwR1M6g+P0p/pIb0sPc6y/Cgv1tqdVC6vv9cKV9TvhZPfTBYuvKD5lqxVsVj2ze 9pAYMCTJF8Zi7lHW4ijoHaiAHQFQ8MqKNBfczQ0gXdmCZeExrol/CjYSyJmYfi71E08G FuhTfLOQvmS7qHIt3fZ7MR+u9xYRw6Iww41ftg1Bv7IotBqk+YItFzYJAg3WS9gbCUKq WCGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=wWNxw0r4wrgI9Kp+M4NlaTVhfNuYhqp7kmjUW/FoeEc=; b=NJdOkJh9MHTrwdHvykHragbBfijnyHGseI1lCNp/0LLmo7MXXLqze338pCyLzjxYk9 Q7JzthAHD1+5hM7zQILQTEPy2wqMfmDPEOalc7dqU94VOlANjU8u24468QdsWzc0Fpny ujkimLdOLREWJsSjzwqmrRpFLi6KSxIM8zjECNPvLC/+QeeqMB/xNUc2XZ0+FTMoi/Xm 4rIGvH5YS/DBq1TYf9hI1TmBqSi8BMh47TY22imudoqlODNTG76edmYBtN1auqnGv7Zj IZ2KVMDInpF/LOumlR0W4DuMwSSZ+vXLkE9KNlDcsBbgjlAc8SQglKZbs8avE+dIm/ly nCGw== X-Gm-Message-State: APt69E3A/NsuhTpGNI3pArbeNpvZIMBzghdorRRQE16ZAzrujGaiL5KT R9E6mw3OujdYW7QXfXe8ZASQyP+c8zCmRg== X-Google-Smtp-Source: AAOMgpcbpqnCPOlK19b25dCvkEO/ebwWJJh99NWlWAIC11UxuyZCI2YtfrVMPlE/5A1ACmxhM01nyw== X-Received: by 2002:a19:1003:: with SMTP id f3-v6mr10103100lfi.116.1530274643647; Fri, 29 Jun 2018 05:17:23 -0700 (PDT) Received: from rafalkozik.semihalf.local (31-172-191-173.noc.fibertech.net.pl. [31.172.191.173]) by smtp.gmail.com with ESMTPSA id r21-v6sm1527333lja.92.2018.06.29.05.17.22 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 29 Jun 2018 05:17:22 -0700 (PDT) From: Rafal Kozik To: dev@dpdk.org Cc: mw@semihalf.com, mk@semihalf.com, gtzalik@amazon.com, evgenys@amazon.com, matua@amazon.com, igorch@amazon.com, thomas@monjalon.net, ferruh.yigit@intel.com, Kozik Date: Fri, 29 Jun 2018 14:17:14 +0200 Message-Id: <1530274637-10156-2-git-send-email-rk@semihalf.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1530274637-10156-1-git-send-email-rk@semihalf.com> References: <1530267873-7236-2-git-send-email-rk@semihalf.com> <1530274637-10156-1-git-send-email-rk@semihalf.com> Subject: [dpdk-dev] [PATCH v4 1/4] igb_uio: add wc option X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" From: Kozik Write combining (WC) increases NIC performance by making better utilization of PCI bus, but cannot be use by all PMD. To get internal_addr memory need to be mapped. But as memory could not be mapped twice: with and without WC it should be skipped for WC. [1] To do not spoil other drivers that potentially could use internal_addr, parameter wc_activate adds possibility to skip it for those PMDs, that do not use it. [1] https://www.kernel.org/doc/ols/2008/ols2008v2-pages-135-144.pdf section 5.3 and 5.4 Signed-off-by: Rafal Kozik Acked-by: Bruce Richardson Acked-by: Ferruh Yigit --- kernel/linux/igb_uio/igb_uio.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/kernel/linux/igb_uio/igb_uio.c b/kernel/linux/igb_uio/igb_uio.c index b3233f1..e16e760 100644 --- a/kernel/linux/igb_uio/igb_uio.c +++ b/kernel/linux/igb_uio/igb_uio.c @@ -30,6 +30,7 @@ struct rte_uio_pci_dev { int refcnt; }; +static int wc_activate; static char *intr_mode; static enum rte_intr_mode igbuio_intr_mode_preferred = RTE_INTR_MODE_MSIX; /* sriov sysfs */ @@ -375,9 +376,14 @@ igbuio_pci_setup_iomem(struct pci_dev *dev, struct uio_info *info, len = pci_resource_len(dev, pci_bar); if (addr == 0 || len == 0) return -1; - internal_addr = ioremap(addr, len); - if (internal_addr == NULL) - return -1; + if (wc_activate == 0) { + internal_addr = ioremap(addr, len); + if (internal_addr == NULL) + return -1; + } else { + internal_addr = NULL; + pr_info("wc_activate is set\n"); + } info->mem[n].name = name; info->mem[n].addr = addr; info->mem[n].internal_addr = internal_addr; @@ -650,6 +656,12 @@ MODULE_PARM_DESC(intr_mode, " " RTE_INTR_MODE_LEGACY_NAME " Use Legacy interrupt\n" "\n"); +module_param(wc_activate, int, 0); +MODULE_PARM_DESC(wc_activate, +"Activate support for write combining (WC) (default=0)\n" +" 0 - disable\n" +" other - enable\n"); + MODULE_DESCRIPTION("UIO driver for Intel IGB PCI cards"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Intel Corporation");