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authorJason Gunthorpe <jgg@mellanox.com>2019-02-12 21:12:51 -0700
committerJason Gunthorpe <jgg@mellanox.com>2019-02-19 20:52:18 -0700
commit324e227ea7c952626abafe72db42ae0d70220a6e (patch)
tree5e0a306788204bfb58ff927c18fb242e81daa1fc /include/rdma/ib_verbs.h
parentRDMA/device: Add ib_device_set_netdev() as an alternative to get_netdev (diff)
downloadlinux-dev-324e227ea7c952626abafe72db42ae0d70220a6e.tar.xz
linux-dev-324e227ea7c952626abafe72db42ae0d70220a6e.zip
RDMA/device: Add ib_device_get_by_netdev()
Several drivers need to find the ib_device from a given netdev. rxe needs this at speed in an unsleepable context, so choose to implement the translation using a RCU safe hash table. The hash table can have a many to one mapping. This is intended to support some future case where multiple IB drivers (ie iWarp and RoCE) connect to the same netdevs. driver_ids will need to be different to support this. In the process this makes the struct ib_device and ib_port_data RCU safe by deferring their kfrees. Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'include/rdma/ib_verbs.h')
-rw-r--r--include/rdma/ib_verbs.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 7f81a313c01b..3aa802b65cf3 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2198,6 +2198,8 @@ struct ib_port_immutable {
};
struct ib_port_data {
+ struct ib_device *ib_dev;
+
struct ib_port_immutable immutable;
spinlock_t pkey_list_lock;
@@ -2206,7 +2208,8 @@ struct ib_port_data {
struct ib_port_cache cache;
spinlock_t netdev_lock;
- struct net_device *netdev;
+ struct net_device __rcu *netdev;
+ struct hlist_node ndev_hash_link;
};
/* rdma netdev type - specifies protocol type */
@@ -2545,6 +2548,7 @@ struct ib_device {
struct device *dma_device;
struct ib_device_ops ops;
char name[IB_DEVICE_NAME_MAX];
+ struct rcu_head rcu_head;
struct list_head event_handler_list;
spinlock_t event_handler_lock;
@@ -3996,6 +4000,10 @@ static inline bool ib_device_try_get(struct ib_device *dev)
}
void ib_device_put(struct ib_device *device);
+struct ib_device *ib_device_get_by_netdev(struct net_device *ndev,
+ enum rdma_driver_id driver_id);
+struct ib_device *ib_device_get_by_name(const char *name,
+ enum rdma_driver_id driver_id);
struct net_device *ib_get_net_dev_by_params(struct ib_device *dev, u8 port,
u16 pkey, const union ib_gid *gid,
const struct sockaddr *addr);