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RDMA/cma: Avoid GID lookups on iWARP devices

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We would like to enable the use of siw on top of a VPN that is
constructed and managed via a tun device. That hasn't worked up
until now because ARPHRD_NONE devices (such as tun devices) have
no GID for the RDMA/core to look up.

But it turns out that the egress device has already been picked for
us -- no GID is necessary. addr_handler() just has to do the right
thing with it.

Link: https://lore.kernel.org/r/168960675257.3007.4737911174148394395.stgit@manet.1015granger.net
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Chuck Lever 2023-07-17 11:12:32 -04:00 committed by Jason Gunthorpe
parent 700c96497b
commit f8ef1be816
1 changed files with 21 additions and 0 deletions
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21
drivers/infiniband/core/cma.c
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@ -700,6 +700,27 @@ cma_validate_port(struct ib_device *device, u32 port,
if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
goto out;
/*
* For drivers that do not associate more than one net device with
* their gid tables, such as iWARP drivers, it is sufficient to
* return the first table entry.
*
* Other driver classes might be included in the future.
*/
if (rdma_protocol_iwarp(device, port)) {
sgid_attr = rdma_get_gid_attr(device, port, 0);
if (IS_ERR(sgid_attr))
goto out;
rcu_read_lock();
ndev = rcu_dereference(sgid_attr->ndev);
if (!net_eq(dev_net(ndev), dev_addr->net) ||
ndev->ifindex != bound_if_index)
sgid_attr = ERR_PTR(-ENODEV);
rcu_read_unlock();
goto out;
}
if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
ndev = dev_get_by_index(dev_addr->net, bound_if_index);
if (!ndev)