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ixgbe: DCB and SR-IOV can not co-exist and will cause hangs

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DCB and SR-IOV cannot currently be enabled at the same time as the queueing
schemes are incompatible.  If they are both enabled it will result in Tx
hangs since only the first Tx queue will be able to transmit any traffic.

This simple fix for this is to block us from enabling TCs in ixgbe_setup_tc
if SR-IOV is enabled.  This change will be reverted once we can support
SR-IOV and DCB coexistence.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2012-07-04 02:00:25 +00:00 committed by David S. Miller
parent 960fb66e52
commit d4e4164943
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@ -6647,6 +6647,11 @@ int ixgbe_setup_tc(struct net_device *dev, u8 tc)
return -EINVAL;
}
if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
e_err(drv, "Enable failed, SR-IOV enabled\n");
return -EINVAL;
}
/* Hardware supports up to 8 traffic classes */
if (tc > adapter->dcb_cfg.num_tcs.pg_tcs ||
(hw->mac.type == ixgbe_mac_82598EB &&