ice: replace single-element array used for C struct hack

Convert the pre-C90-extension "C struct hack" method (using a single-
element array at the end of a structure for implementing variable-length
types) to the preferred use of C99 flexible array member.

Additional code cleanups were done near areas affected by this change.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 20 insertions, 19 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_flex_type.h b/drivers/net/ethernet/intel/ice/ice_flex_type.h
index a6f391eac8ff..c1c99a267a98 100644
--- a/drivers/net/ethernet/intel/ice/ice_flex_type.h
+++ b/drivers/net/ethernet/intel/ice/ice_flex_type.h
@@ -22,7 +22,7 @@ struct ice_fv {
 struct ice_pkg_hdr {
 	struct ice_pkg_ver pkg_format_ver;
 	__le32 seg_count;
-	__le32 seg_offset[1];
+	__le32 seg_offset[];
 };
 
 /* generic segment */
@@ -53,12 +53,12 @@ struct ice_device_id_entry {
 struct ice_seg {
 	struct ice_generic_seg_hdr hdr;
 	__le32 device_table_count;
-	struct ice_device_id_entry device_table[1];
+	struct ice_device_id_entry device_table[];
 };
 
 struct ice_nvm_table {
 	__le32 table_count;
-	__le32 vers[1];
+	__le32 vers[];
 };
 
 struct ice_buf {
@@ -68,7 +68,7 @@ struct ice_buf {
 
 struct ice_buf_table {
 	__le32 buf_count;
-	struct ice_buf buf_array[1];
+	struct ice_buf buf_array[];
 };
 
 /* global metadata specific segment */
@@ -101,11 +101,12 @@ struct ice_section_entry {
 struct ice_buf_hdr {
 	__le16 section_count;
 	__le16 data_end;
-	struct ice_section_entry section_entry[1];
+	struct ice_section_entry section_entry[];
 };
 
 #define ICE_MAX_ENTRIES_IN_BUF(hd_sz, ent_sz) ((ICE_PKG_BUF_SIZE - \
-	sizeof(struct ice_buf_hdr) - (hd_sz)) / (ent_sz))
+	struct_size((struct ice_buf_hdr *)0, section_entry, 1) - (hd_sz)) /\
+	(ent_sz))
 
 /* ice package section IDs */
 #define ICE_SID_XLT0_SW			10
@@ -198,17 +199,17 @@ struct ice_label {
 
 struct ice_label_section {
 	__le16 count;
-	struct ice_label label[1];
+	struct ice_label label[];
 };
 
 #define ICE_MAX_LABELS_IN_BUF ICE_MAX_ENTRIES_IN_BUF( \
-	sizeof(struct ice_label_section) - sizeof(struct ice_label), \
-	sizeof(struct ice_label))
+	struct_size((struct ice_label_section *)0, label, 1) - \
+	sizeof(struct ice_label), sizeof(struct ice_label))
 
 struct ice_sw_fv_section {
 	__le16 count;
 	__le16 base_offset;
-	struct ice_fv fv[1];
+	struct ice_fv fv[];
 };
 
 /* The BOOST TCAM stores the match packet header in reverse order, meaning
@@ -245,30 +246,30 @@ struct ice_boost_tcam_entry {
 struct ice_boost_tcam_section {
 	__le16 count;
 	__le16 reserved;
-	struct ice_boost_tcam_entry tcam[1];
+	struct ice_boost_tcam_entry tcam[];
 };
 
 #define ICE_MAX_BST_TCAMS_IN_BUF ICE_MAX_ENTRIES_IN_BUF( \
-	sizeof(struct ice_boost_tcam_section) - \
+	struct_size((struct ice_boost_tcam_section *)0, tcam, 1) - \
 	sizeof(struct ice_boost_tcam_entry), \
 	sizeof(struct ice_boost_tcam_entry))
 
 struct ice_xlt1_section {
 	__le16 count;
 	__le16 offset;
-	u8 value[1];
-} __packed;
+	u8 value[];
+};
 
 struct ice_xlt2_section {
 	__le16 count;
 	__le16 offset;
-	__le16 value[1];
+	__le16 value[];
 };
 
 struct ice_prof_redir_section {
 	__le16 count;
 	__le16 offset;
-	u8 redir_value[1];
+	u8 redir_value[];
 };
 
 /* package buffer building */
@@ -327,7 +328,7 @@ struct ice_tunnel_table {
 struct ice_pkg_es {
 	__le16 count;
 	__le16 offset;
-	struct ice_fv_word es[1];
+	struct ice_fv_word es[];
 };
 
 struct ice_es {
@@ -461,8 +462,8 @@ struct ice_prof_tcam_entry {
 
 struct ice_prof_id_section {
 	__le16 count;
-	struct ice_prof_tcam_entry entry[1];
-} __packed;
+	struct ice_prof_tcam_entry entry[];
+};
 
 struct ice_prof_tcam {
 	u32 sid;