linux-kernel - [PATCH net] net: dpaa_eth: print FD status in CPU endianness in dpaa_eth

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Message-Id: <20241029163105.44135-1-vladimir.oltean@nxp.com>
Date: Tue, 29 Oct 2024 18:31:05 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org,
	Radu Bulie <radu-andrei.bulie@....com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Breno Leitao <leitao@...ian.org>,
	Madalin Bucur <madalin.bucur@....com>,
	Ioana Ciornei <ioana.ciornei@....com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Sean Anderson <sean.anderson@...ux.dev>,
	linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH net] net: dpaa_eth: print FD status in CPU endianness in dpaa_eth_fd tracepoint

Sparse warns:

note: in included file (through ../include/trace/trace_events.h,
../include/trace/define_trace.h,
../drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h):
warning: incorrect type in assignment (different base types)
   expected unsigned int [usertype] fd_status
   got restricted __be32 const [usertype] status

We take struct qm_fd :: status, store it and print it as an u32,
though it is a big endian field. We should print the FD status in
CPU endianness for ease of debug and consistency between PowerPC and
Arm systems.

Though it is a not often used debug feature, it is best to treat it as
a bug and backport the format change to all supported stable kernels,
for consistency.

Fixes: eb11ddf36eb8 ("dpaa_eth: add trace points")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
Context: https://lore.kernel.org/oe-kbuild-all/20241028-sticky-refined-lionfish-b06c0c@leitao/

 drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h
index 6f0e58a2a58a..9e1d44ae92cc 100644
--- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h
+++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth_trace.h
@@ -56,7 +56,7 @@ DECLARE_EVENT_CLASS(dpaa_eth_fd,
 		__entry->fd_format = qm_fd_get_format(fd);
 		__entry->fd_offset = qm_fd_get_offset(fd);
 		__entry->fd_length = qm_fd_get_length(fd);
-		__entry->fd_status = fd->status;
+		__entry->fd_status = __be32_to_cpu(fd->status);
 		__assign_str(name);
 	),
 
-- 
2.34.1