diff options
| author | Chuck Lever <chuck.lever@oracle.com> | 2023-07-17 18:12:32 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2023-07-21 22:00:18 +0300 |
| commit | f8ef1be816bf9a0c406c696368c2264a9597a994 (patch) | |
| tree | bc2a52156952fa1f5fc102696f0c824276cac39d /drivers/infiniband/core | |
| parent | 700c96497ba9acf1a3554a3cd3ba6c79db3cbcf7 (diff) | |
| download | linux-f8ef1be816bf9a0c406c696368c2264a9597a994.tar.xz | |
RDMA/cma: Avoid GID lookups on iWARP devices
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>
Diffstat (limited to 'drivers/infiniband/core')
| -rw-r--r-- | drivers/infiniband/core/cma.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index da54167723d6..8bd6cb867381 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -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) |