diff options
Diffstat (limited to 'drivers/infiniband/core/cache.c')
| -rw-r--r-- | drivers/infiniband/core/cache.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c index 0bee1f4b914e..8957d31d60ca 100644 --- a/drivers/infiniband/core/cache.c +++ b/drivers/infiniband/core/cache.c @@ -1252,6 +1252,39 @@ void rdma_hold_gid_attr(const struct ib_gid_attr *attr) } EXPORT_SYMBOL(rdma_hold_gid_attr); +/** + * rdma_read_gid_attr_ndev_rcu - Read GID attribute netdevice + * which must be in UP state. + * + * @attr:Pointer to the GID attribute + * + * Returns pointer to netdevice if the netdevice was attached to GID and + * netdevice is in UP state. Caller must hold RCU lock as this API + * reads the netdev flags which can change while netdevice migrates to + * different net namespace. Returns ERR_PTR with error code otherwise. + * + */ +struct net_device *rdma_read_gid_attr_ndev_rcu(const struct ib_gid_attr *attr) +{ + struct ib_gid_table_entry *entry = + container_of(attr, struct ib_gid_table_entry, attr); + struct ib_device *device = entry->attr.device; + struct net_device *ndev = ERR_PTR(-ENODEV); + u8 port_num = entry->attr.port_num; + struct ib_gid_table *table; + unsigned long flags; + bool valid; + + table = rdma_gid_table(device, port_num); + + read_lock_irqsave(&table->rwlock, flags); + valid = is_gid_entry_valid(table->data_vec[attr->index]); + if (valid && attr->ndev && (READ_ONCE(attr->ndev->flags) & IFF_UP)) + ndev = attr->ndev; + read_unlock_irqrestore(&table->rwlock, flags); + return ndev; +} + static int config_non_roce_gid_cache(struct ib_device *device, u8 port, int gid_tbl_len) { |