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RDMA/core: Add and expose static device index

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This patch adds static device index in similar fashion to
already available in netdev world (struct net->ifindex).

In downstream patches, the RDMA nelink will use this idx-to-ib_device
conversion, so as part of this commit, we are exposing the translation
function to be visible for IB/core users.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
This commit is contained in:
Leon Romanovsky 2017-06-18 14:39:59 +03:00 committed by Leon Romanovsky
parent 8030c8357a
commit ecc82c53f9
3 changed files with 43 additions and 1 deletions
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5
drivers/infiniband/core/core_priv.h
View file

@ -309,4 +309,9 @@ static inline int ib_mad_enforce_security(struct ib_mad_agent_private *map,
return 0;
}
#endif
struct ib_device *__ib_device_get_by_index(u32 ifindex);
/* RDMA device netlink */
void nldev_init(void);
void nldev_exit(void);
#endif /* _CORE_PRIV_H */

37
drivers/infiniband/core/device.c
View file

@ -134,6 +134,17 @@ static int ib_device_check_mandatory(struct ib_device *device)
return 0;
}
struct ib_device *__ib_device_get_by_index(u32 index)
{
struct ib_device *device;
list_for_each_entry(device, &device_list, core_list)
if (device->index == index)
return device;
return NULL;
}
static struct ib_device *__ib_device_get_by_name(const char *name)
{
struct ib_device *device;
@ -145,7 +156,6 @@ static struct ib_device *__ib_device_get_by_name(const char *name)
return NULL;
}
static int alloc_name(char *name)
{
unsigned long *inuse;
@ -394,6 +404,30 @@ static int ib_security_change(struct notifier_block *nb, unsigned long event,
return NOTIFY_OK;
}
/**
* __dev_new_index - allocate an device index
*
* Returns a suitable unique value for a new device interface
* number. It assumes that there are less than 2^32-1 ib devices
* will be present in the system.
*/
static u32 __dev_new_index(void)
{
/*
* The device index to allow stable naming.
* Similar to struct net -> ifindex.
*/
static u32 index;
for (;;) {
if (!(++index))
index = 1;
if (!__ib_device_get_by_index(index))
return index;
}
}
/**
* ib_register_device - Register an IB device with IB core
* @device:Device to register
@ -492,6 +526,7 @@ int ib_register_device(struct ib_device *device,
if (client->add && !add_client_context(device, client))
client->add(device);
device->index = __dev_new_index();
down_write(&lists_rwsem);
list_add_tail(&device->core_list, &device_list);
up_write(&lists_rwsem);

2
include/rdma/ib_verbs.h
View file

@ -2298,6 +2298,8 @@ struct ib_device {
struct rdmacg_device cg_device;
#endif
u32 index;
/**
* The following mandatory functions are used only at device
* registration. Keep functions such as these at the end of this