diff options
| author | Jack Morgenstein <jackm@dev.mellanox.co.il> | 2012-08-03 08:40:39 +0000 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2012-09-30 20:33:30 -0700 |
| commit | 73aaa7418f8069103ca56fc620b3cd16c5a37d6e (patch) | |
| tree | 0110a685c949f7ce92e804ddff1cf6f34482d152 | |
| parent | ff7166c447df23a61e4f51bf748319dc6728dc74 (diff) | |
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>
| -rw-r--r-- | drivers/infiniband/core/cache.c | 32 | ||||
| -rw-r--r-- | include/rdma/ib_cache.h | 16 |
2 files changed, 48 insertions, 0 deletions
diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c index 4da381b74f54..80f6cf2449fb 100644 --- a/drivers/infiniband/core/cache.c +++ b/drivers/infiniband/core/cache.c @@ -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) diff --git a/include/rdma/ib_cache.h b/include/rdma/ib_cache.h index 00a2b8ec327f..ad9a3c280944 100644 --- a/include/rdma/ib_cache.h +++ b/include/rdma/ib_cache.h @@ -101,6 +101,22 @@ int ib_find_cached_pkey(struct ib_device *device, 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. * @port_num: The port number of the device to query. |