netdev - [PATCH net-next 06/11] igb: fix assignment on big endian machines

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Message-Id: <20210526172346.3515587-7-anthony.l.nguyen@intel.com>
Date:   Wed, 26 May 2021 10:23:41 -0700
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        netdev@...r.kernel.org, sassmann@...hat.com,
        anthony.l.nguyen@...el.com, Dave Switzer <david.switzer@...el.com>
Subject: [PATCH net-next 06/11] igb: fix assignment on big endian machines

From: Jesse Brandeburg <jesse.brandeburg@...el.com>

The igb driver was trying hard to be sparse correct, but somehow
ended up converting a variable into little endian order and then
tries to OR something with it.

A much plainer way of doing things is to leave all variables and
OR operations in CPU (non-endian) mode, and then convert to
little endian only once, which is what this change does.

This probably fixes a bug that might have been seen only on
big endian systems.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Tested-by: Dave Switzer <david.switzer@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
Warning Detail:
.../igb/igb_main.c:6286:23: warning: incorrect type in assignment (different base types)
.../igb/igb_main.c:6286:23:    expected unsigned int [usertype] olinfo_status
.../igb/igb_main.c:6286:23:    got restricted __le32 [usertype]
.../igb/igb_main.c:6291:37: warning: incorrect type in assignment (different base types)
.../igb/igb_main.c:6291:37:    expected restricted __le32 [usertype] olinfo_status
.../igb/igb_main.c:6291:37:    got unsigned int [assigned] [usertype] olinfo_status
---
 drivers/net/ethernet/intel/igb/igb_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 3a96b61a7229..f555670e9271 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -6276,12 +6276,12 @@ int igb_xmit_xdp_ring(struct igb_adapter *adapter,
 	cmd_type |= len | IGB_TXD_DCMD;
 	tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
 
-	olinfo_status = cpu_to_le32(len << E1000_ADVTXD_PAYLEN_SHIFT);
+	olinfo_status = len << E1000_ADVTXD_PAYLEN_SHIFT;
 	/* 82575 requires a unique index per ring */
 	if (test_bit(IGB_RING_FLAG_TX_CTX_IDX, &tx_ring->flags))
 		olinfo_status |= tx_ring->reg_idx << 4;
 
-	tx_desc->read.olinfo_status = olinfo_status;
+	tx_desc->read.olinfo_status = cpu_to_le32(olinfo_status);
 
 	netdev_tx_sent_queue(txring_txq(tx_ring), tx_buffer->bytecount);
 
-- 
2.26.2