Subject: [PATCH AUTOSEL 5.13 047/189] igb: fix assignment on big endian machines

From: Sasha Levin <[email-masked]>
Date: Tue, 6 Jul 2021 07:11:47 -0400

From: Jesse Brandeburg <[email-masked]>

[ Upstream commit b514958dd1a3bd57638b0e63b8e5152b1960e6aa ]

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 <[email-masked]>
Tested-by: Dave Switzer <[email-masked]>
Signed-off-by: Tony Nguyen <[email-masked]>
Signed-off-by: Sasha Levin <[email-masked]>
---
 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 b0232a8de343..7b1885f9ce03 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);
 
-- 
2.30.2