xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

RDMA/device: Add ib_device_get_by_netdev()

Browse Source 
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>
This commit is contained in:
Jason Gunthorpe
2019-02-12 21:12:51 -07:00
parent c2261dd76b
commit 324e227ea7
2 changed files with 116 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
include/rdma/ib_verbs.h
View File

@@ -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);