From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 1F6D9A00E6 for ; Thu, 11 Jul 2019 18:30:20 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 31E1831FC; Thu, 11 Jul 2019 18:30:19 +0200 (CEST) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id 8FA972BD5 for ; Thu, 11 Jul 2019 18:30:17 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Jul 2019 09:30:16 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,479,1557212400"; d="scan'208";a="168072156" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by fmsmga007.fm.intel.com with ESMTP; 11 Jul 2019 09:30:15 -0700 To: vattunuru@marvell.com, dev@dpdk.org Cc: olivier.matz@6wind.com, arybchenko@solarflare.com, Kiran Kumar K References: <20190422061533.17538-1-kirankumark@marvell.com> <20190625035700.2953-1-vattunuru@marvell.com> <20190625035700.2953-5-vattunuru@marvell.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190625035700.2953-5-vattunuru@marvell.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v6 4/4] kernel/linux/kni: add IOVA support in kni module 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" On 6/25/2019 4:57 AM, vattunuru@marvell.com wrote: > From: Kiran Kumar K > > Patch adds support for kernel module to work in IOVA = VA mode, > the idea is to get physical address from iova address using > iommu_iova_to_phys API and later use phys_to_virt API to > convert the physical address to kernel virtual address. > > When compared with IOVA = PA mode, there is no performance > drop with this approach. > > This approach does not work with the kernel versions less > than 4.4.0 because of API compatibility issues. > > Signed-off-by: Kiran Kumar K > Signed-off-by: Vamsi Attunuru <...> > @@ -351,15 +354,56 @@ kni_ioctl_create(struct net *net, uint32_t ioctl_num, > strncpy(kni->name, dev_info.name, RTE_KNI_NAMESIZE); > > /* Translate user space info into kernel space info */ > - kni->tx_q = phys_to_virt(dev_info.tx_phys); > - kni->rx_q = phys_to_virt(dev_info.rx_phys); > - kni->alloc_q = phys_to_virt(dev_info.alloc_phys); > - kni->free_q = phys_to_virt(dev_info.free_phys); > - > - kni->req_q = phys_to_virt(dev_info.req_phys); > - kni->resp_q = phys_to_virt(dev_info.resp_phys); > - kni->sync_va = dev_info.sync_va; > - kni->sync_kva = phys_to_virt(dev_info.sync_phys); > + if (dev_info.iova_mode) { > +#if KERNEL_VERSION(4, 4, 0) > LINUX_VERSION_CODE We have "kni/compat.h" to put the version checks, please use abstracted feature checks only in the code. >From experience this goes ugly quickly with the addition to distro kernels and their specific versioning, so better to hide these all from the source code. And this version requirement needs to be documented in kni doc. > + (void)pci; > + pr_err("Kernel version is not supported\n"); Can you please include 'iova_mode' condition into the message log, because this kernel version is supported if user wants to use via 'iova_mode == 0' condition. > + return -EINVAL; > +#else > + pci = pci_get_device(dev_info.vendor_id, > + dev_info.device_id, NULL); > + while (pci) { > + if ((pci->bus->number == dev_info.bus) && > + (PCI_SLOT(pci->devfn) == dev_info.devid) && > + (PCI_FUNC(pci->devfn) == dev_info.function)) { > + domain = iommu_get_domain_for_dev(&pci->dev); > + break; > + } > + pci = pci_get_device(dev_info.vendor_id, > + dev_info.device_id, pci); > + } What if 'pci' is NULL here? In kni it is not required to provide a device at all. <...> > @@ -186,7 +202,10 @@ kni_fifo_trans_pa2va(struct kni_dev *kni, > return; > > for (i = 0; i < num_rx; i++) { > - kva = pa2kva(kni->pa[i]); > + if (likely(kni->iova_mode == 1)) > + kva = iova2kva(kni, kni->pa[i]); > + else > + kva = pa2kva(kni->pa[i]); To reduce the churn, what about updating the 'pa2kva()' and put the "(kni->iova_mode == 1)" check there? Does it help? (not only 'pa2kva()' but its friends also, and if it makes more sense agree to rename the functions) And btw, why 'likely' case is "kni->iova_mode == 1"?