From: Jiri Pirko <jiri@resnulli.us>
To: linux-rdma@vger.kernel.org
Cc: 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, mkoutny@suse.com, hannes@cmpxchg.org,
alibuda@linux.alibaba.com, dust.li@linux.alibaba.com,
sidraya@linux.ibm.com, wenjia@linux.ibm.com
Subject: [PATCH rdma-next 09/13] RDMA/cma: Document that CM configfs cannot be net namespace scoped
Date: Thu, 9 Jul 2026 11:55:28 +0200 [thread overview]
Message-ID: <20260709095532.855647-10-jiri@resnulli.us> (raw)
In-Reply-To: <20260709095532.855647-1-jiri@resnulli.us>
From: Jiri Pirko <jiri@nvidia.com>
Document the rdma_cm configfs limitation: configfs is global, so same-named
RDMA devices in different net namespaces cannot both be represented there.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
Documentation/ABI/testing/configfs-rdma_cm | 4 ++++
drivers/infiniband/core/cma_configfs.c | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/Documentation/ABI/testing/configfs-rdma_cm b/Documentation/ABI/testing/configfs-rdma_cm
index 74f9506f42e7..739f7b6a1259 100644
--- a/Documentation/ABI/testing/configfs-rdma_cm
+++ b/Documentation/ABI/testing/configfs-rdma_cm
@@ -12,6 +12,10 @@ Description: Interface is used to configure RDMA-cable HCAs in respect to
for this HCA has to be created:
mkdir -p /config/rdma_cm/<hca>
+ Note: configfs has no network namespace support, so this
+ interface cannot represent two devices that share a name in
+ different network namespaces (possible in exclusive netns mode).
+
What: /config/rdma_cm/<hca>/ports/<port-num>/default_roce_mode
Date: November 29, 2015
diff --git a/drivers/infiniband/core/cma_configfs.c b/drivers/infiniband/core/cma_configfs.c
index 891e52afb8f4..c389d4e37b6b 100644
--- a/drivers/infiniband/core/cma_configfs.c
+++ b/drivers/infiniband/core/cma_configfs.c
@@ -65,6 +65,10 @@ static struct cma_dev_port_group *to_dev_port_group(struct config_item *item)
return container_of(group, struct cma_dev_port_group, group);
}
+/*
+ * configfs is not net namespace aware, so a name shared by devices in
+ * different namespaces resolves to the first match here.
+ */
static bool filter_by_name(struct ib_device *ib_dev, void *cookie)
{
return !strcmp(dev_name(&ib_dev->dev), cookie);
--
2.54.0
next prev parent reply other threads:[~2026-07-09 9:56 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-09 9:55 [PATCH rdma-next 00/13] RDMA: Make device names unique per net namespace Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 01/13] RDMA/core: Pass the net namespace to the device name lookups Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 02/13] RDMA/core: Handle device name conflicts when changing net namespace Jiri Pirko
2026-07-10 9:56 ` sashiko-bot
2026-07-09 9:55 ` [PATCH rdma-next 03/13] RDMA/core: Support renaming a device when changing its " Jiri Pirko
2026-07-10 9:56 ` sashiko-bot
2026-07-09 9:55 ` [PATCH rdma-next 04/13] RDMA/nldev: Report net namespace move errors through extack Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 05/13] RDMA/nldev: Allow setting the device name while changing net namespace Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 06/13] net/smc: Look up the pnetid ib device within the " Jiri Pirko
2026-07-10 9:56 ` sashiko-bot
2026-07-09 9:55 ` [PATCH rdma-next 07/13] RDMA/srp: Make the SRP sysfs class net namespace aware Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 08/13] RDMA/cgroup: Scope rdma cgroup device visibility to the net namespace Jiri Pirko
2026-07-09 13:04 ` Michal Koutný
2026-07-10 9:56 ` sashiko-bot
2026-07-09 9:55 ` Jiri Pirko [this message]
2026-07-09 9:55 ` [PATCH rdma-next 10/13] RDMA/core: Document the SELinux ibendport net namespace limitation Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 11/13] RDMA/core: Make device names unique per net namespace Jiri Pirko
2026-07-09 9:55 ` [PATCH rdma-next 12/13] RDMA/rxe: Implement disassociate_ucontext callback Jiri Pirko
2026-07-10 4:21 ` Zhu Yanjun
2026-07-10 9:56 ` sashiko-bot
2026-07-09 9:55 ` [PATCH rdma-next 13/13] RDMA/selftests: Add rxe_netns_names test Jiri Pirko
2026-07-10 4:24 ` Zhu Yanjun
2026-07-10 9:56 ` sashiko-bot
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