IB/core: IB cache enhancements to support Infiniband security

Cache the subnet prefix and add a function to access it. Enforcing
security requires frequent queries of the subnet prefix and the pkeys in
the pkey table.

Signed-off-by: Daniel Jurgens <danielj@mellanox.com>
Reviewed-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
Acked-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

3 files changed, 26 insertions, 0 deletions

diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index b1371eb9f46c..b9c0066b704e 100644
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -911,6 +911,26 @@ int ib_get_cached_pkey(struct ib_device *device,
 }
 EXPORT_SYMBOL(ib_get_cached_pkey);
 
+int ib_get_cached_subnet_prefix(struct ib_device *device,
+                                u8                port_num,
+                                u64              *sn_pfx)
+{
+        unsigned long flags;
+        int p;
+
+        if (port_num < rdma_start_port(device) ||
+            port_num > rdma_end_port(device))
+                return -EINVAL;
+
+        p = port_num - rdma_start_port(device);
+        read_lock_irqsave(&device->cache.lock, flags);
+        *sn_pfx = device->cache.ports[p].subnet_prefix;
+        read_unlock_irqrestore(&device->cache.lock, flags);
+
+        return 0;
+}
+EXPORT_SYMBOL(ib_get_cached_subnet_prefix);
+
 int ib_find_cached_pkey(struct ib_device *device,
                         u8                port_num,
                         u16               pkey,
@@ -1108,6 +1128,8 @@ static void ib_cache_update(struct ib_device *device,
         device->cache.ports[port - rdma_start_port(device)].port_state =
                 tprops->state;
 
+        device->cache.ports[port - rdma_start_port(device)].subnet_prefix =
+                                                        tprops->subnet_prefix;
         write_unlock_irq(&device->cache.lock);
 
         kfree(gid_cache);
diff --git a/drivers/infiniband/core/core_priv.h b/drivers/infiniband/core/core_priv.h
index cb7d372e4bdf..249e3ed90365 100644
--- a/drivers/infiniband/core/core_priv.h
+++ b/drivers/infiniband/core/core_priv.h
@@ -176,4 +176,7 @@ int ib_nl_handle_set_timeout(struct sk_buff *skb,
 int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
                              struct netlink_callback *cb);
 
+int ib_get_cached_subnet_prefix(struct ib_device *device,
+                                u8                port_num,
+                                u64              *sn_pfx);
 #endif /* _CORE_PRIV_H */
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index ba8314ec5768..9dc4e7e0aba4 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1891,6 +1891,7 @@ enum ib_mad_result {
 };
 
 struct ib_port_cache {
+        u64                   subnet_prefix;
         struct ib_pkey_cache  *pkey;
         struct ib_gid_table   *gid;
         u8                     lmc;