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[195.250.132.146]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493eb6fb526sm69825665e9.15.2026.07.09.06.04.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jul 2026 06:04:25 -0700 (PDT) Date: Thu, 9 Jul 2026 15:04:23 +0200 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: Jiri Pirko Cc: linux-rdma@vger.kernel.org, cgroups@vger.kernel.org, netdev@vger.kernel.org, linux-s390@vger.kernel.org, linux-kselftest@vger.kernel.org, jgg@ziepe.ca, leon@kernel.org, parav@nvidia.com, mbloch@nvidia.com, cmeiohas@nvidia.com, roman.gushchin@linux.dev, bvanassche@acm.org, zyjzyj2000@gmail.com, shuah@kernel.org, tj@kernel.org, hannes@cmpxchg.org, alibuda@linux.alibaba.com, dust.li@linux.alibaba.com, sidraya@linux.ibm.com, wenjia@linux.ibm.com Subject: Re: [PATCH rdma-next 08/13] RDMA/cgroup: Scope rdma cgroup device visibility to the net namespace Message-ID: References: <20260709095532.855647-1-jiri@resnulli.us> <20260709095532.855647-9-jiri@resnulli.us> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="y2qmoqgw5gkrylpt" Content-Disposition: inline In-Reply-To: <20260709095532.855647-9-jiri@resnulli.us> --y2qmoqgw5gkrylpt Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH rdma-next 08/13] RDMA/cgroup: Scope rdma cgroup device visibility to the net namespace MIME-Version: 1.0 Hi. On Thu, Jul 09, 2026 at 11:55:27AM +0200, Jiri Pirko wro= te: > index 993446ab66d0..4523c1884d67 100644 > --- a/Documentation/admin-guide/cgroup-v2.rst > +++ b/Documentation/admin-guide/cgroup-v2.rst > @@ -2752,6 +2752,13 @@ RDMA > The "rdma" controller regulates the distribution and accounting of > RDMA resources. > =20 > +When RDMA devices are isolated per network namespace (exclusive mode), > +device names are unique only within a network namespace. The device lines > +below are therefore scoped to the reading or writing process's network > +namespace: only devices accessible from that namespace are listed, and a > +limit is applied to the device of that name in that namespace. Configure > +limits from the same network namespace as the workloads. OK. > --- a/include/linux/cgroup_rdma.h > +++ b/include/linux/cgroup_rdma.h > @@ -7,6 +7,7 @@ > #define _CGROUP_RDMA_H > =20 > #include > +#include > =20 > enum rdmacg_resource_type { > RDMACG_RESOURCE_HCA_HANDLE, > @@ -34,6 +35,15 @@ struct rdmacg_device { > struct list_head dev_node; > struct list_head rpools; > char *name; > + /* > + * Net namespace the device belongs to. @netns_shared mirrors > + * ib_devices_shared_netns: when true the device is visible from every > + * net namespace (shared mode); otherwise @net is the only namespace > + * that may see and configure it. @netns_shared is updated when the > + * sharing mode changes, so use {READ,WRITE}_ONCE() to access it. > + */ > + possible_net_t net; > + bool netns_shared; Any reason to store the netns_shared split per device? (IIUC, it's a global parameter.) Thanks, Michal --y2qmoqgw5gkrylpt Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJEEABYKADkWIQRCE24Fn/AcRjnLivR+PQLnlNv4CAUCak+cKRsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQfj0C55Tb+AgSmgD/Vgg6K9wF0JX4NBgdz4NM xV33/zTua20t6++MDiv2LGQA/iiwBIKorFXkq2bd30gmVkdyXN6gNLUnmclqxnfK +M0P =L3DZ -----END PGP SIGNATURE----- --y2qmoqgw5gkrylpt--