fm10k: correctly pack TLV structures and explain reasoning

The TLV format for little endian structures is actually 4 byte aligned
copy. To this end, we need to add an additional __aligned(4) marker
along with __packed to ensure that these structures are actually 4 byte
aligned and packed correctly. Use of just __packed will not work as this
will result in 1byte alignment which is incorrect. Add a comment
explaining the reasoning behind why these structures need the special
treatment.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Krishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_pf.h b/drivers/net/ethernet/intel/fm10k/fm10k_pf.h
index a8fc512..3378592 100644 (file)
--- a/drivers/net/ethernet/intel/fm10k/fm10k_pf.h
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_pf.h
@@ -74,6 +74,11 @@ enum fm10k_pf_tlv_attr_id_v1 {
 #define FM10K_MSG_UPDATE_PVID_PVID_SHIFT       16
 #define FM10K_MSG_UPDATE_PVID_PVID_SIZE                16
 
+/* The following data structures are overlayed directly onto TLV mailbox
+ * messages, and must not break 4 byte alignment. Ensure the structures line
+ * up correctly as per their TLV definition.
+ */
+
 struct fm10k_mac_update {
        __le32  mac_lower;
        __le16  mac_upper;
@@ -81,26 +86,26 @@ struct fm10k_mac_update {
        __le16  glort;
        u8      flags;
        u8      action;
-} __packed;
+} __aligned(4) __packed;
 
 struct fm10k_global_table_data {
        __le32  used;
        __le32  avail;
-} __packed;
+} __aligned(4) __packed;
 
 struct fm10k_swapi_error {
        __le32                          status;
        struct fm10k_global_table_data  mac;
        struct fm10k_global_table_data  nexthop;
        struct fm10k_global_table_data  ffu;
-} __packed;
+} __aligned(4) __packed;
 
 struct fm10k_swapi_1588_timestamp {
        __le64 egress;
        __le64 ingress;
        __le16 dglort;
        __le16 sglort;
-} __packed;
+} __aligned(4) __packed;
 
 s32 fm10k_msg_lport_map_pf(struct fm10k_hw *, u32 **, struct fm10k_mbx_info *);
 extern const struct fm10k_tlv_attr fm10k_lport_map_msg_attr[];