From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Date: Tue, 6 Jul 2021 07:20:20 -0400 Subject: [Intel-wired-lan] [PATCH AUTOSEL 5.10 034/137] igb: fix assignment on big endian machines In-Reply-To: <20210706112203.2062605-1-sashal@kernel.org> References: <20210706112203.2062605-1-sashal@kernel.org> Message-ID: <20210706112203.2062605-34-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: From: Jesse Brandeburg [ 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 Tested-by: Dave Switzer Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- 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 157683fbf61c..4b9b5148c916 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -6289,12 +6289,12 @@ 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