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IB/core: Add ib_find_exact_cached_pkey() 

When P_Key tables potentially contain both full and partial membership
copies for the same P_Key, we need a function to find the index for an
exact (16-bit) P_Key.

This is necessary when the master forwards QP1 MADs sent by guests.
If the guest has sent the MAD with a limited membership P_Key, we need
to to forward the MAD using the same limited membership P_Key.  Since
the master may have both the limited and the full member P_Keys in its
table, we must make sure to retrieve the limited membership P_Key in
this case.

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Jack Morgenstein 2012-08-03 08:40:39 +00:00 committed by Roland Dreier
parent ff7166c447
commit 73aaa7418f
2 changed files with 48 additions and 0 deletions
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32
drivers/infiniband/core/cache.c
View File

@ -199,6 +199,38 @@ int ib_find_cached_pkey(struct ib_device *device,
}
EXPORT_SYMBOL(ib_find_cached_pkey);
int ib_find_exact_cached_pkey(struct ib_device *device,
u8 port_num,
u16 pkey,
u16 *index)
{
struct ib_pkey_cache *cache;
unsigned long flags;
int i;
int ret = -ENOENT;
if (port_num < start_port(device) || port_num > end_port(device))
return -EINVAL;
read_lock_irqsave(&device->cache.lock, flags);
cache = device->cache.pkey_cache[port_num - start_port(device)];
*index = -1;
for (i = 0; i < cache->table_len; ++i)
if (cache->table[i] == pkey) {
*index = i;
ret = 0;
break;
}
read_unlock_irqrestore(&device->cache.lock, flags);
return ret;
}
EXPORT_SYMBOL(ib_find_exact_cached_pkey);
int ib_get_cached_lmc(struct ib_device *device,
u8 port_num,
u8 *lmc)

16
include/rdma/ib_cache.h
View File

@ -100,6 +100,22 @@ int ib_find_cached_pkey(struct ib_device *device,
u16 pkey,
u16 *index);
/**
* ib_find_exact_cached_pkey - Returns the PKey table index where a specified
* PKey value occurs. Comparison uses the FULL 16 bits (incl membership bit)
* @device: The device to query.
* @port_num: The port number of the device to search for the PKey.
* @pkey: The PKey value to search for.
* @index: The index into the cached PKey table where the PKey was found.
*
* ib_find_exact_cached_pkey() searches the specified PKey table in
* the local software cache.
*/
int ib_find_exact_cached_pkey(struct ib_device *device,
u8 port_num,
u16 pkey,
u16 *index);
/**
* ib_get_cached_lmc - Returns a cached lmc table entry
* @device: The device to query.