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RDMA/rxe: prevent rxe creation on top of vlan interface

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Creating rxe device on top of vlan interface will create a non-functional
device that has an empty gids table and can't be used for rdma cm
communication.

This is caused by the logic in
enum_all_gids_of_dev_cb()/is_eth_port_of_netdev(), which only considers
networks connected to "upper devices" of the configured network device,
resulting in an empty set of gids for a vlan interface, and attempts to
connect via this rdma device fail in cm_init_av_for_response because no
gids can be resolved.

Apparently, this behavior was implemented to fit the HW-RoCE devices that
create RoCE device per port, therefore RXE must behave the same like
HW-RoCE devices and create rxe device per real device only.

In order to communicate via a vlan interface, the user must use the gid
index of the vlan address instead of creating rxe over vlan.

Link: https://lore.kernel.org/r/20200811150415.3693-1-goody698@gmail.com
Signed-off-by: Mohammad Heib <goody698@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Mohammad Heib 2020-08-11 18:04:15 +03:00 committed by Jason Gunthorpe
parent 785167a114
commit fd49ddaf7e
2 changed files with 12 additions and 0 deletions
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6
drivers/infiniband/sw/rxe/rxe.c
View File

@ -277,6 +277,12 @@ static int rxe_newlink(const char *ibdev_name, struct net_device *ndev)
struct rxe_dev *exists;
int err = 0;
if (is_vlan_dev(ndev)) {
pr_err("rxe creation allowed on top of a real device only\n");
err = -EPERM;
goto err;
}
exists = rxe_get_dev_from_net(ndev);
if (exists) {
ib_device_put(&exists->ib_dev);

6
drivers/infiniband/sw/rxe/rxe_sysfs.c
View File

@ -73,6 +73,12 @@ static int rxe_param_set_add(const char *val, const struct kernel_param *kp)
return -EINVAL;
}
if (is_vlan_dev(ndev)) {
pr_err("rxe creation allowed on top of a real device only\n");
err = -EPERM;
goto err;
}
exists = rxe_get_dev_from_net(ndev);
if (exists) {
ib_device_put(&exists->ib_dev);