IB/core: Use a common header for uverbs flow_specs

A common header will allows better checking of flow specs size, while
ensuring strict alignment to 64 bits.

Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Link: http://marc.info/?i=cover.1383773832.git.ydroneaud@opteya.com
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 40 insertions, 13 deletions

diff --git a/include/uapi/rdma/ib_user_verbs.h b/include/uapi/rdma/ib_user_verbs.h
index ef2be64bf4c3..43014981550a 100644
--- a/include/uapi/rdma/ib_user_verbs.h
+++ b/include/uapi/rdma/ib_user_verbs.h
@@ -701,6 +701,14 @@ struct ib_uverbs_detach_mcast {
 };
 
 #ifdef CONFIG_INFINIBAND_EXPERIMENTAL_UVERBS_FLOW_STEERING
+struct ib_uverbs_flow_spec_hdr {
+        __u32 type;
+        __u16 size;
+        __u16 reserved;
+        /* followed by flow_spec */
+        __u64 flow_spec_data[0];
+};
+
 struct ib_uverbs_flow_eth_filter {
         __u8  dst_mac[6];
         __u8  src_mac[6];
@@ -709,9 +717,14 @@ struct ib_uverbs_flow_eth_filter {
 };
 
 struct ib_uverbs_flow_spec_eth {
-        __u32  type;
-        __u16  size;
-        __u16  reserved;
+        union {
+                struct ib_uverbs_flow_spec_hdr hdr;
+                struct {
+                        __u32 type;
+                        __u16 size;
+                        __u16 reserved;
+                };
+        };
         struct ib_uverbs_flow_eth_filter val;
         struct ib_uverbs_flow_eth_filter mask;
 };
@@ -722,9 +735,14 @@ struct ib_uverbs_flow_ipv4_filter {
 };
 
 struct ib_uverbs_flow_spec_ipv4 {
-        __u32  type;
-        __u16  size;
-        __u16  reserved;
+        union {
+                struct ib_uverbs_flow_spec_hdr hdr;
+                struct {
+                        __u32 type;
+                        __u16 size;
+                        __u16 reserved;
+                };
+        };
         struct ib_uverbs_flow_ipv4_filter val;
         struct ib_uverbs_flow_ipv4_filter mask;
 };
@@ -735,19 +753,27 @@ struct ib_uverbs_flow_tcp_udp_filter {
 };
 
 struct ib_uverbs_flow_spec_tcp_udp {
-        __u32  type;
-        __u16  size;
-        __u16  reserved;
+        union {
+                struct ib_uverbs_flow_spec_hdr hdr;
+                struct {
+                        __u32 type;
+                        __u16 size;
+                        __u16 reserved;
+                };
+        };
         struct ib_uverbs_flow_tcp_udp_filter val;
         struct ib_uverbs_flow_tcp_udp_filter mask;
 };
 
 struct ib_uverbs_flow_spec {
         union {
-                struct {
-                        __u32 type;
-                        __u16 size;
-                        __u16 reserved;
+                union {
+                        struct ib_uverbs_flow_spec_hdr hdr;
+                        struct {
+                                __u32 type;
+                                __u16 size;
+                                __u16 reserved;
+                        };
                 };
                 struct ib_uverbs_flow_spec_eth      eth;
                 struct ib_uverbs_flow_spec_ipv4    ipv4;
@@ -767,6 +793,7 @@ struct ib_uverbs_flow_attr {
          * struct ib_flow_spec_xxx
          * struct ib_flow_spec_yyy
          */
+        struct ib_uverbs_flow_spec_hdr flow_specs[0];
 };
 
 struct ib_uverbs_create_flow  {