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 ACBC4A2EFC for ; Tue, 15 Oct 2019 17:43:15 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 23AD81ED15; Tue, 15 Oct 2019 17:43:15 +0200 (CEST) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by dpdk.org (Postfix) with ESMTP id EE0E31ED09 for ; Tue, 15 Oct 2019 17:43:12 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Oct 2019 08:43:12 -0700 X-IronPort-AV: E=Sophos;i="5.67,300,1566889200"; d="scan'208";a="189381341" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.10]) ([10.237.221.10]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/AES256-SHA; 15 Oct 2019 08:43:09 -0700 To: vattunuru@marvell.com, dev@dpdk.org Cc: thomas@monjalon.net, jerinj@marvell.com, olivier.matz@6wind.com, ferruh.yigit@intel.com, anatoly.burakov@intel.com, arybchenko@solarflare.com, kirankumark@marvell.com References: <20190729121313.30639-2-vattunuru@marvell.com> <20190816061252.17214-1-vattunuru@marvell.com> <20190816061252.17214-5-vattunuru@marvell.com> From: "Yigit, Ferruh" Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@linux.intel.com; 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charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v10 4/5] kni: add IOVA=VA 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 8/16/2019 7:12 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. > > Patch also updates these support details in KNI documentation. > > Signed-off-by: Kiran Kumar K > Signed-off-by: Vamsi Attunuru <...> > @@ -348,15 +351,65 @@ 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) { > +#ifdef HAVE_IOVA_AS_VA_SUPPORT > + pci = pci_get_device(dev_info.vendor_id, > + dev_info.device_id, NULL); > + if (pci == NULL) { > + pr_err("pci dev does not exist\n"); > + return -ENODEV; > + } If there is no PCI device KNI should still work.