linux-kernel - [PATCH 4.9 159/310] cxgb4: Fix netdev

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Message-Id: <20180411183629.234879736@linuxfoundation.org>
Date:   Wed, 11 Apr 2018 20:34:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arjun Vynipadath <arjun@...lsio.com>,
        Steve Wise <swise@...ngridcomputing.com>,
        Ganesh Goudar <ganeshgr@...lsio.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 159/310] cxgb4: Fix netdev_features flag

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arjun Vynipadath <arjun@...lsio.com>


[ Upstream commit 90592b9a35836bacd34d92a3aba7958756b6a7c0 ]

GRO is not supported by Chelsio HW when rx_csum is disabled.
Update the netdev features flag when rx_csum is modified.

Signed-off-by: Arjun Vynipadath <arjun@...lsio.com>
Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
Signed-off-by: Ganesh Goudar <ganeshgr@...lsio.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -2742,6 +2742,16 @@ static int cxgb_setup_tc(struct net_devi
 	return -EOPNOTSUPP;
 }
 
+static netdev_features_t cxgb_fix_features(struct net_device *dev,
+					   netdev_features_t features)
+{
+	/* Disable GRO, if RX_CSUM is disabled */
+	if (!(features & NETIF_F_RXCSUM))
+		features &= ~NETIF_F_GRO;
+
+	return features;
+}
+
 static const struct net_device_ops cxgb4_netdev_ops = {
 	.ndo_open             = cxgb_open,
 	.ndo_stop             = cxgb_close,
@@ -2766,6 +2776,7 @@ static const struct net_device_ops cxgb4
 #endif
 	.ndo_set_tx_maxrate   = cxgb_set_tx_maxrate,
 	.ndo_setup_tc         = cxgb_setup_tc,
+	.ndo_fix_features     = cxgb_fix_features,
 };
 
 #ifdef CONFIG_PCI_IOV