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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
parentff7166c447df23a61e4f51bf748319dc6728dc74 (diff)
downloadop-kernel-dev-73aaa7418f8069103ca56fc620b3cd16c5a37d6e.zip
op-kernel-dev-73aaa7418f8069103ca56fc620b3cd16c5a37d6e.tar.gz
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.c32
-rw-r--r--include/rdma/ib_cache.h16
2 files changed, 48 insertions, 0 deletions
diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index 4da381b..80f6cf2 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 00a2b8e..ad9a3c2 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.
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