netdev - [net-next 2/9] i40e: Properly check allowed advertisement capabilities

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Message-Id: <20180319175659.17685-3-jeffrey.t.kirsher@intel.com>
Date:   Mon, 19 Mar 2018 10:56:52 -0700
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     davem@...emloft.net
Cc:     Jan Sokolowski <jan.sokolowski@...el.com>, netdev@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 2/9] i40e: Properly check allowed advertisement capabilities

From: Jan Sokolowski <jan.sokolowski@...el.com>

The i40e_set_link_ksettings and i40e_get_link_ksettings use different
codepaths to check available and supported advertisement modes. This
creates scenarios where it's possible to set a mode that's not allowed,
resulting in a link down.

Fix setting advertisement in i40e_set_link_ksettings by calling
i40e_get_link_ksettings to check what modes are allowed.

Signed-off-by: Jan Sokolowski <jan.sokolowski@...el.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 89807e32a898..0ce68e8a45cc 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -870,23 +870,21 @@ static int i40e_set_link_ksettings(struct net_device *netdev,
 	/* save autoneg out of ksettings */
 	autoneg = copy_ks.base.autoneg;
 
-	memset(&safe_ks, 0, sizeof(safe_ks));
+	/* get our own copy of the bits to check against */
+	memset(&safe_ks, 0, sizeof(struct ethtool_link_ksettings));
+	safe_ks.base.cmd = copy_ks.base.cmd;
+	safe_ks.base.link_mode_masks_nwords =
+		copy_ks.base.link_mode_masks_nwords;
+	i40e_get_link_ksettings(netdev, &safe_ks);
+
 	/* Get link modes supported by hardware and check against modes
 	 * requested by the user.  Return an error if unsupported mode was set.
 	 */
-	i40e_phy_type_to_ethtool(pf, &safe_ks);
 	if (!bitmap_subset(copy_ks.link_modes.advertising,
 			   safe_ks.link_modes.supported,
 			   __ETHTOOL_LINK_MODE_MASK_NBITS))
 		return -EINVAL;
 
-	/* get our own copy of the bits to check against */
-	memset(&safe_ks, 0, sizeof(struct ethtool_link_ksettings));
-	safe_ks.base.cmd = copy_ks.base.cmd;
-	safe_ks.base.link_mode_masks_nwords =
-		copy_ks.base.link_mode_masks_nwords;
-	i40e_get_link_ksettings(netdev, &safe_ks);
-
 	/* set autoneg back to what it currently is */
 	copy_ks.base.autoneg = safe_ks.base.autoneg;
 
-- 
2.14.3