[dpdk-dev] [PATCH v2 07/36] net/ice/base: use struct size helper

[Qi Zhang]

For structures using the common C "struct hack" technique to create a
flexible length structure member at the end of the structure, use the
ice_struct_size macro to determine the length of the structure instead of
open coding the calculation.

Signed-off-by: Bruce Allan <bruce.w.allan at intel.com>
Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr at intel.com>
Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
---
 drivers/net/ice/base/ice_common.c    | 4 ++--
 drivers/net/ice/base/ice_flex_pipe.c | 5 ++---
 drivers/net/ice/base/ice_sched.c     | 2 +-
 drivers/net/ice/base/ice_type.h      | 3 +++
 4 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ice/base/ice_common.c b/drivers/net/ice/base/ice_common.c
index 9ef1aeef2..4b1b31066 100644
--- a/drivers/net/ice/base/ice_common.c
+++ b/drivers/net/ice/base/ice_common.c
@@ -1680,7 +1680,7 @@ ice_alloc_hw_res(struct ice_hw *hw, u16 type, u16 num, bool btm, u16 *res)
 	enum ice_status status;
 	u16 buf_len;
 
-	buf_len = sizeof(*buf) + sizeof(buf->elem) * (num - 1);
+	buf_len = ice_struct_size(buf, elem, num - 1);
 	buf = (struct ice_aqc_alloc_free_res_elem *)
 		ice_malloc(hw, buf_len);
 	if (!buf)
@@ -1720,7 +1720,7 @@ ice_free_hw_res(struct ice_hw *hw, u16 type, u16 num, u16 *res)
 	enum ice_status status;
 	u16 buf_len;
 
-	buf_len = sizeof(*buf) + sizeof(buf->elem) * (num - 1);
+	buf_len = ice_struct_size(buf, elem, num - 1);
 	buf = (struct ice_aqc_alloc_free_res_elem *)ice_malloc(hw, buf_len);
 	if (!buf)
 		return ICE_ERR_NO_MEMORY;
diff --git a/drivers/net/ice/base/ice_flex_pipe.c b/drivers/net/ice/base/ice_flex_pipe.c
index 1598efd67..82b27de0e 100644
--- a/drivers/net/ice/base/ice_flex_pipe.c
+++ b/drivers/net/ice/base/ice_flex_pipe.c
@@ -1136,8 +1136,7 @@ static enum ice_status ice_get_pkg_info(struct ice_hw *hw)
 
 	ice_debug(hw, ICE_DBG_TRACE, "%s\n", __func__);
 
-	size = sizeof(*pkg_info) + (sizeof(pkg_info->pkg_info[0]) *
-				    (ICE_PKG_CNT - 1));
+	size = ice_struct_size(pkg_info, pkg_info, ICE_PKG_CNT - 1);
 	pkg_info = (struct ice_aqc_get_pkg_info_resp *)ice_malloc(hw, size);
 	if (!pkg_info)
 		return ICE_ERR_NO_MEMORY;
@@ -1209,7 +1208,7 @@ static enum ice_status ice_verify_pkg(struct ice_pkg_hdr *pkg, u32 len)
 		return ICE_ERR_CFG;
 
 	/* make sure segment array fits in package length */
-	if (len < sizeof(*pkg) + ((seg_count - 1) * sizeof(pkg->seg_offset)))
+	if (len < ice_struct_size(pkg, seg_offset, seg_count - 1))
 		return ICE_ERR_BUF_TOO_SHORT;
 
 	/* all segments must fit within length */
diff --git a/drivers/net/ice/base/ice_sched.c b/drivers/net/ice/base/ice_sched.c
index 740f7c3ff..03885d027 100644
--- a/drivers/net/ice/base/ice_sched.c
+++ b/drivers/net/ice/base/ice_sched.c
@@ -899,7 +899,7 @@ ice_sched_add_elems(struct ice_port_info *pi, struct ice_sched_node *tc_node,
 	u16 buf_size;
 	u32 teid;
 
-	buf_size = sizeof(*buf) + sizeof(*buf->generic) * (num_nodes - 1);
+	buf_size = ice_struct_size(buf, generic, num_nodes - 1);
 	buf = (struct ice_aqc_add_elem *)ice_malloc(hw, buf_size);
 	if (!buf)
 		return ICE_ERR_NO_MEMORY;
diff --git a/drivers/net/ice/base/ice_type.h b/drivers/net/ice/base/ice_type.h
index 237220ee8..59dce32fa 100644
--- a/drivers/net/ice/base/ice_type.h
+++ b/drivers/net/ice/base/ice_type.h
@@ -34,6 +34,9 @@
 
 #define IS_ASCII(_ch)	((_ch) < 0x80)
 
+#define ice_struct_size(ptr, field, num) \
+	(sizeof(*(ptr)) + sizeof(*(ptr)->field) * (num))
+
 #include "ice_status.h"
 #include "ice_hw_autogen.h"
 #include "ice_devids.h"
-- 
2.13.6