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authorJack Morgenstein <jackm@dev.mellanox.co.il>2012-08-03 08:40:39 +0000
committerRoland Dreier <roland@purestorage.com>2012-09-30 20:33:30 -0700
commit73aaa7418f8069103ca56fc620b3cd16c5a37d6e (patch)
tree0110a685c949f7ce92e804ddff1cf6f34482d152 /drivers/infiniband/core
parentff7166c447df23a61e4f51bf748319dc6728dc74 (diff)
downloadlinux-73aaa7418f8069103ca56fc620b3cd16c5a37d6e.tar.bz2
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>
Diffstat (limited to 'drivers/infiniband/core')
-rw-r--r--drivers/infiniband/core/cache.c32
1 files changed, 32 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)