From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by dpdk.org (Postfix) with ESMTP id 23A948019; Wed, 18 Apr 2018 14:32:56 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id A5678722C3; Wed, 18 Apr 2018 12:32:55 +0000 (UTC) Received: from dhcp-25.97.bos.redhat.com (ovpn-123-24.rdu2.redhat.com [10.10.123.24]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 317831C72E; Wed, 18 Apr 2018 12:32:55 +0000 (UTC) From: Aaron Conole To: Alejandro Lucero Cc: dev , Adrien Mazarguil , stable@dpdk.org, Thomas Monjalon References: <20180412222208.11770-1-aconole@redhat.com> <20180412222208.11770-3-aconole@redhat.com> Date: Wed, 18 Apr 2018 08:32:54 -0400 In-Reply-To: (Alejandro Lucero's message of "Wed, 18 Apr 2018 11:53:20 +0100") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Wed, 18 Apr 2018 12:32:55 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Wed, 18 Apr 2018 12:32:55 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'aconole@redhat.com' RCPT:'' Subject: Re: [dpdk-dev] [RFC 2/2] nfp: allow for non-root user 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: , X-List-Received-Date: Wed, 18 Apr 2018 12:32:56 -0000 Alejandro Lucero writes: > On Tue, Apr 17, 2018 at 8:19 PM, Aaron Conole wrote: > > Alejandro Lucero writes: > > > I was just wondering, if device device PCI sysfs resource files or VFIO group /dev files > require to change > > permissions for non-root users, does it not make sense to adjust also /var/lock in the > system? > > For the /dev, we use udev rules - so the correct individual vfio device > files get assigned the correct permissions. No such mechanism exists > for /var/lock as far as I can tell. > > Ex. see: > > https://github.com/openvswitch/ovs/blob/master/rhel/usr_lib_udev_rules.d_91-vfio.rules > > > Maybe something similar exists that we could use to generate the lock > file automatically? > > What about /sysfs/bus/pci/device/$PCI_DEV/resource file? > > Is RH forcing OVS DPDK to only work if the host has IOMMU support? Yes. > > On Tue, Apr 17, 2018 at 4:44 PM, Alejandro Lucero > wrote: > > > > I have seen that VFIO also requires explicitly to set the right permissions for non-root > users to VFIO > > groups under /dev/vfio. > > > > I assume then that running OVS or other DPDK apps as non-root is possible, > although requiring > > those explicit permissions changes, and therefore this patch is necessary. > > > > Adding stable@ and Thomas for discussing how can this be added to stable DPDK > versions even if > > this is not going to be a patch for current DPDK version. > > > > Acked-by: Alejandro Lucero > > > > On Fri, Apr 13, 2018 at 4:31 PM, Alejandro Lucero > wrote: > > > > On Fri, Apr 13, 2018 at 2:31 PM, Aaron Conole wrote: > > > > Alejandro Lucero writes: > > > > > Again, this patch is correct, but because NFP PMD needs to access > > > /sys/bus/pci/devices/$DEVICE_PCI_STRING/resource$RESOURCE_ID, and these files > have > > just > > > read/write accesses for root, I do not know if this is really necessary. > > > > > > Being honest, I have not used a DPDK app with NFP PMD and not being root. Does > it > > work > > > with non-root users and other PMDs with same requirements regarding sysfs > resource > > files? > > > > We do run as non-root user definitely with Intel PMDs. > > > > I'm not very sure about other vendors, but I think mlx pmd runs as > > non-root user (and it was modified to move off of sysfs for that > > reason[1]). > > > > It is possible to not rely on sysfs resource files if device is attached to VFIO, but I > think that is a > > must with UIO. > > > > > > I'll continue to push for more information from the testing side to find > > out though. > > > > [1]: http://dpdk.org/ml/archives/dev/2018-February/090586.html > > > > > On Fri, Apr 13, 2018 at 12:22 AM, Aaron Conole wrote: > > > > > > Currently, the nfp lock files are taken from the global lock file > > > location, which will work when the user is running as root. However, > > > some distributions and applications (notably ovs 2.8+ on RHEL/Fedora) > > > run as a non-root user. > > > > > > Signed-off-by: Aaron Conole > > > --- > > > drivers/net/nfp/nfp_nfpu.c | 23 ++++++++++++++++++----- > > > 1 file changed, 18 insertions(+), 5 deletions(-) > > > > > > diff --git a/drivers/net/nfp/nfp_nfpu.c b/drivers/net/nfp/nfp_nfpu.c > > > index 2ed985ff4..ae2e07220 100644 > > > --- a/drivers/net/nfp/nfp_nfpu.c > > > +++ b/drivers/net/nfp/nfp_nfpu.c > > > @@ -18,6 +18,22 @@ > > > #define NFP_CFG_EXP_BAR 7 > > > > > > #define NFP_CFG_EXP_BAR_CFG_BASE 0x30000 > > > +#define NFP_LOCKFILE_PATH_FMT "%s/nfp%d" > > > + > > > +/* get nfp lock file path (/var/lock if root, $HOME otherwise) */ > > > +static void > > > +nspu_get_lockfile_path(char *buffer, int bufsz, nfpu_desc_t *desc) > > > +{ > > > + const char *dir = "/var/lock"; > > > + const char *home_dir = getenv("HOME"); > > > + > > > + if (getuid() != 0 && home_dir != NULL) > > > + dir = home_dir; > > > + > > > + /* use current prefix as file path */ > > > + snprintf(buffer, bufsz, NFP_LOCKFILE_PATH_FMT, dir, > > > + desc->nfp); > > > +} > > > > > > /* There could be other NFP userspace tools using the NSP interface. > > > * Make sure there is no other process using it and locking the access for > > > @@ -30,9 +46,7 @@ nspv_aquire_process_lock(nfpu_desc_t *desc) > > > struct flock lock; > > > char lockname[30]; > > > > > > - memset(&lock, 0, sizeof(lock)); > > > - > > > - snprintf(lockname, sizeof(lockname), "/var/lock/nfp%d", desc->nfp); > > > + nspu_get_lockfile_path(lockname, sizeof(lockname), desc); > > > > > > /* Using S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH */ > > > desc->lock = open(lockname, O_RDWR | O_CREAT, 0666); > > > @@ -106,7 +120,6 @@ nfpu_close(nfpu_desc_t *desc) > > > rte_free(desc->nspu); > > > close(desc->lock); > > > > > > - snprintf(lockname, sizeof(lockname), "/var/lock/nfp%d", desc->nfp); > > > - unlink(lockname); > > > + nspu_get_lockfile_path(lockname, sizeof(lockname), desc); > > > return 0; > > > } > > > -- > > > 2.14.3