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Commit 73aaa741 authored by Jack Morgenstein's avatar Jack Morgenstein Committed by Roland Dreier
Browse files

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: default avatarJack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: default avatarOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: default avatarRoland Dreier <roland@purestorage.com>
parent ff7166c4

drivers/infiniband/core/cache.c

+32 −0
Original line number Diff line number Diff line
@@ -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)

include/rdma/ib_cache.h

+16 −0
Original line number Diff line number Diff line
@@ -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.