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net/smc: Look up the pnetid ib device within the net namespace

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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 <jiri@nvidia.com>
Link: https://patch.msgid.link/20260716132316.1495242-7-jiri@resnulli.us
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Jiri Pirko
2026-07-16 15:23:07 +02:00
committed by Leon Romanovsky
parent 601f3fd97d
commit 47b9ef3c00
1 changed files with 14 additions and 6 deletions
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20
net/smc/smc_pnet.c
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@@ -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;