netdev - [PATCH net-next v3 2/2] net: thunderbolt: Use bitwise types in the struct thunderbolt_ip_frame

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Message-Id: <20221130123613.20829-2-andriy.shevchenko@linux.intel.com>
Date:   Wed, 30 Nov 2022 14:36:13 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH net-next v3 2/2] net: thunderbolt: Use bitwise types in the struct thunderbolt_ip_frame_header

The main usage of the struct thunderbolt_ip_frame_header is to handle
the packets on the media layer. The header is bound to the protocol
in which the byte ordering is crucial. However the data type definition
doesn't use that and sparse is unhappy, for example (17 altogether):

  .../thunderbolt.c:718:23: warning: cast to restricted __le32

  .../thunderbolt.c:966:42: warning: incorrect type in assignment (different base types)
  .../thunderbolt.c:966:42:    expected unsigned int [usertype] frame_count
  .../thunderbolt.c:966:42:    got restricted __le32 [usertype]

Switch to the bitwise types in the struct thunderbolt_ip_frame_header to
reduce this, but not completely solving (9 left), because the same data
type is used for Rx header handled locally (in CPU byte order).

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
v3: no changes
v2: changed only types without splitting the data type (Mika)
 drivers/net/thunderbolt.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/thunderbolt.c b/drivers/net/thunderbolt.c
index c73d419f1456..4ed7f5b547e3 100644
--- a/drivers/net/thunderbolt.c
+++ b/drivers/net/thunderbolt.c
@@ -58,10 +58,10 @@
  * supported then @frame_id is filled, otherwise it stays %0.
  */
 struct thunderbolt_ip_frame_header {
-	u32 frame_size;
-	u16 frame_index;
-	u16 frame_id;
-	u32 frame_count;
+	__le32 frame_size;
+	__le16 frame_index;
+	__le16 frame_id;
+	__le32 frame_count;
 };
 
 enum thunderbolt_ip_frame_pdf {
-- 
2.35.1