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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Vladimir Oltean <vladimir.oltean@nxp.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.17 153/225] net: enetc: allow tc-etf offload even with NETIF_F_CSUM_MASK
Date:   Wed,  4 May 2022 18:46:31 +0200
Message-Id: <20220504153123.731449210@linuxfoundation.org>
In-Reply-To: <20220504153110.096069935@linuxfoundation.org>
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From: Vladimir Oltean <vladimir.oltean@nxp.com>

[ Upstream commit 66a2f5ef68faaf950746747d790a0c95f7ec96d2 ]

The Time-Specified Departure feature is indeed mutually exclusive with
TX IP checksumming in ENETC, but TX checksumming in itself is broken and
was removed from this driver in commit 82728b91f124 ("enetc: Remove Tx
checksumming offload code").

The blamed commit declared NETIF_F_HW_CSUM in dev->features to comply
with software TSO's expectations, and still did the checksumming in
software by calling skb_checksum_help(). So there isn't any restriction
for the Time-Specified Departure feature.

However, enetc_setup_tc_txtime() doesn't understand that, and blindly
looks for NETIF_F_CSUM_MASK.

Instead of checking for things which can literally never happen in the
current code base, just remove the check and let the driver offload
tc-etf qdiscs.

Fixes: acede3c5dad5 ("net: enetc: declare NETIF_F_HW_CSUM and do it in software")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20220427203017.1291634-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/freescale/enetc/enetc_qos.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_qos.c b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
index d3d7172e0fcc..3b148d4e0f0c 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_qos.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
@@ -308,10 +308,6 @@ int enetc_setup_tc_txtime(struct net_device *ndev, void *type_data)
 	if (tc < 0 || tc >= priv->num_tx_rings)
 		return -EINVAL;
 
-	/* Do not support TXSTART and TX CSUM offload simutaniously */
-	if (ndev->features & NETIF_F_CSUM_MASK)
-		return -EBUSY;
-
 	/* TSD and Qbv are mutually exclusive in hardware */
 	if (enetc_rd(&priv->si->hw, ENETC_QBV_PTGCR_OFFSET) & ENETC_QBV_TGE)
 		return -EBUSY;
-- 
2.35.1