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Thu, 09 Jul 2026 02:55:54 -0700 (PDT) From: Jiri Pirko 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 06/13] net/smc: Look up the pnetid ib device within the net namespace Date: Thu, 9 Jul 2026 11:55:25 +0200 Message-ID: <20260709095532.855647-7-jiri@resnulli.us> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260709095532.855647-1-jiri@resnulli.us> References: <20260709095532.855647-1-jiri@resnulli.us> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Jiri Pirko Scope smc_pnet_find_ib() to the caller's net namespace so pnetid setup cannot bind to a same-named RDMA device from another namespace once names become per-netns. Signed-off-by: Jiri Pirko --- net/smc/smc_pnet.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/net/smc/smc_pnet.c b/net/smc/smc_pnet.c index 63e286e2dfaa..ff9c9c35cc2f 100644 --- a/net/smc/smc_pnet.c +++ b/net/smc/smc_pnet.c @@ -304,13 +304,18 @@ static bool smc_pnetid_valid(const char *pnet_name, char *pnetid) return true; } -/* Find an infiniband device by a given name. The device might not exist. */ -static struct smc_ib_device *smc_pnet_find_ib(char *ib_name) +/* + * Find an infiniband device by a given name, restricted to the devices + * accessible from @net. The device might not exist. + */ +static struct smc_ib_device *smc_pnet_find_ib(struct net *net, char *ib_name) { struct smc_ib_device *ibdev; mutex_lock(&smc_ib_devices.mutex); list_for_each_entry(ibdev, &smc_ib_devices.list, list) { + if (!rdma_dev_access_netns(ibdev->ibdev, net)) + continue; if (!strncmp(ibdev->ibdev->name, ib_name, sizeof(ibdev->ibdev->name)) || (ibdev->ibdev->dev.parent && @@ -408,8 +413,8 @@ static int smc_pnet_add_eth(struct smc_pnettable *pnettable, struct net *net, return rc; } -static int smc_pnet_add_ib(struct smc_pnettable *pnettable, char *ib_name, - u8 ib_port, char *pnet_name) +static int smc_pnet_add_ib(struct smc_pnettable *pnettable, struct net *net, + char *ib_name, u8 ib_port, char *pnet_name) { struct smc_pnetentry *tmp_pe, *new_pe; struct smc_ib_device *ib_dev; @@ -419,7 +424,7 @@ static int smc_pnet_add_ib(struct smc_pnettable *pnettable, char *ib_name, bool new_ibdev; /* try to apply the pnetid to active devices */ - ib_dev = smc_pnet_find_ib(ib_name); + ib_dev = smc_pnet_find_ib(net, ib_name); if (ib_dev) { ibdev_applied = smc_pnet_apply_ib(ib_dev, ib_port, pnet_name); if (ibdev_applied) @@ -518,7 +523,7 @@ static int smc_pnet_enter(struct net *net, struct nlattr *tb[]) if (ibport < 1 || ibport > SMC_MAX_PORTS) goto error; } - rc = smc_pnet_add_ib(pnettable, string, ibport, pnet_name); + rc = smc_pnet_add_ib(pnettable, net, string, ibport, pnet_name); if (!rc) new_ibdev = true; else if (rc != -EEXIST) @@ -1170,6 +1175,9 @@ int smc_pnetid_by_table_ib(struct smc_ib_device *smcibdev, u8 ib_port) struct smc_net *sn; int rc = -ENOENT; + if (!rdma_dev_access_netns(smcibdev->ibdev, &init_net)) + return -ENOENT; + /* get pnettable for init namespace */ sn = net_generic(&init_net, smc_net_id); pnettable = &sn->pnettable; -- 2.54.0