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 7B21AA00C5; Wed, 6 May 2020 18:40:43 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id E82691DA29; Wed, 6 May 2020 18:40:42 +0200 (CEST) Received: from dispatch1-us1.ppe-hosted.com (dispatch1-us1.ppe-hosted.com [148.163.129.52]) by dpdk.org (Postfix) with ESMTP id 4110D1DA21 for ; Wed, 6 May 2020 18:40:41 +0200 (CEST) Received: from mx1-us1.ppe-hosted.com (unknown [10.7.65.62]) by dispatch1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id BCFDA6010B; Wed, 6 May 2020 16:40:40 +0000 (UTC) Received: from us4-mdac16-59.ut7.mdlocal (unknown [10.7.66.50]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTP id BAFA88009B; Wed, 6 May 2020 16:40:40 +0000 (UTC) X-Virus-Scanned: Proofpoint Essentials engine Received: from mx1-us1.ppe-hosted.com (unknown [10.7.65.176]) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id ECF0428007F; Wed, 6 May 2020 16:40:39 +0000 (UTC) Received: from webmail.solarflare.com (uk.solarflare.com [193.34.186.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mx1-us1.ppe-hosted.com (PPE Hosted ESMTP Server) with ESMTPS id 5204368007C; Wed, 6 May 2020 16:40:39 +0000 (UTC) Received: from [192.168.38.17] (10.17.10.39) by ukex01.SolarFlarecom.com (10.17.10.4) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 6 May 2020 17:40:32 +0100 To: Haiyue Wang , , , , , , , References: <20200305043311.17065-1-vattunuru@marvell.com> <20200426015514.39489-1-haiyue.wang@intel.com> <20200426015514.39489-3-haiyue.wang@intel.com> From: Andrew Rybchenko Autocrypt: addr=arybchenko@solarflare.com; keydata= mQINBF2681gBEACbdTxu8eLL3UX2oAelsnK9GkeaJeUYSOHPJQpV7RL/iaIskqTwBRnhjXt7 j9UEwGA+omnOmqQMpeQTb/F9Ma2dYE+Hw4/t/1KVjxr3ehFaASvwR4fWJfO4e2l/Rk4rG6Yi 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X-TM-AS-Result: No-13.012000-8.000000-10 X-TMASE-MatchedRID: WMT2WRIkHPNEgaBf5eVRwvZvT2zYoYOwC/ExpXrHizxsMPuLZB/IR4jw YzF1DjNPKLIZjka1nvcI0emILnGBKTCitzEOtuK1EcRh6j7d8SfOoAXTAVKONVIxScKXZnK0UG1 wDP3HbhIE5DilxIFj7RitSPHZblZ+LGmmJTL2jhwD2WXLXdz+AVG+BHSGRsbgstyQ00HI6JsFRR wR0T64Ueo99/gRUheYxSiiOdPXiYnYMEqhScrQBQf11J5hhjjqAp+UH372RZUUvn93ewYigrSBw HWXUXPhdzX7JhiBFd3BJaZEksLzVUcvp9l5mdFbitvkWeP31kmnZS/aYgjrztZd/DOmlnxIL2an mvXFs1kOtcEPUqmr0mtDTXm2BAENxYonxq3qFbYW8Al79bnAD4HLFWR93TgkaygfAod0OjfT/pF zauZLmflKaYxVCJqwNYbxf45iO7NNfs8n85Te8oMbH85DUZXyseWplitmp0j6C0ePs7A07RRAJC 2k3BZ6l85G6BmHAmA7XGrxEYTd1YiXUqpKBjl1A8H0WOzbtSI= X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--13.012000-8.000000 X-TMASE-Version: SMEX-12.5.0.1300-8.5.1020-25402.001 X-MDID: 1588783240-69xH6NbiCHfh Subject: Re: [dpdk-dev] [PATCH v10 2/2] eal: support for VFIO-PCI VF token 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 4/26/20 4:55 AM, Haiyue Wang wrote: > The kernel module vfio-pci introduces the VF token to enable SR-IOV > support since 5.7. > > The VF token can be set by a vfio-pci based PF driver and must be known > by the vfio-pci based VF driver in order to gain access to the device. > > Signed-off-by: Haiyue Wang > Acked-by: Vamsi Attunuru > Tested-by: Vamsi Attunuru Few points below, anyway: Acked-by: Andrew Rybchenko [snip] > diff --git a/doc/guides/linux_gsg/linux_drivers.rst b/doc/guides/linux_gsg/linux_drivers.rst > index 238f3e900..b42fd708b 100644 > --- a/doc/guides/linux_gsg/linux_drivers.rst > +++ b/doc/guides/linux_gsg/linux_drivers.rst > @@ -72,11 +72,50 @@ Note that in order to use VFIO, your kernel must support it. > VFIO kernel modules have been included in the Linux kernel since version 3.6.0 and are usually present by default, > however please consult your distributions documentation to make sure that is the case. > > +The ``vfio-pci`` module since Linux version 5.7 supports the creation of virtual > +functions. After the PF is bound to vfio-pci module, the user can create the VFs > +by sysfs interface, and these VFs are bound to vfio-pci module automatically. > + > +When the PF is bound to vfio-pci, it has initial VF token generated by random. For > +security reason, this token is write only, the user can't read it from the kernel > +directly. For accessing the VF, the user needs to start the PF with token parameter > +to setup a VF token (uuid format), then the VF can be accessed with this new known > +VF token. If token is write-only in kernel sysfs, shouldn't we make it invisible in ps output (procfs)? I.e. substitute with something like xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. However, it does not look easy. Just a thought. [snip] > diff --git a/drivers/bus/pci/linux/pci_vfio.c b/drivers/bus/pci/linux/pci_vfio.c > index 64cd84a68..efb64e2ba 100644 > --- a/drivers/bus/pci/linux/pci_vfio.c > +++ b/drivers/bus/pci/linux/pci_vfio.c > @@ -11,6 +11,7 @@ > #include > #include > > +#include > #include > #include > #include > @@ -644,12 +645,72 @@ pci_vfio_msix_is_mappable(int vfio_dev_fd, int msix_region) > return ret; > } > > +static int > +vfio_pci_vf_token_arg(struct rte_devargs *devargs, rte_uuid_t uuid) > +{ > +#define VF_TOKEN_ARG "vf_token=" > + char c, *p, *vf_token; > + > + memset(uuid, 0, sizeof(rte_uuid_t)); > + > + if (devargs == NULL) > + return 0; > + > + p = strstr(devargs->args, VF_TOKEN_ARG); > + if (!p) Please, p == NULL as you do few lines above. [snip]