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ixgbe: fix rx-usecs range checks for BQL

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This patch resolves an issue where the logic used to detect changes in rx-usecs
was incorrect and was masked by the call to ixgbe_update_rsc().

Setting rx-usecs between 0,2-9 and 1,10 and up requires a reset to allow
ixgbe_configure_tx_ring() to set the correct value for TXDCTL.WTHRESH in
order to avoid Tx hangs with BQL enabled.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Emil Tantilov 2013-10-22 08:21:04 +00:00 committed by Jeff Kirsher
parent c0798edfb3
commit 2e0103810c
1 changed files with 3 additions and 3 deletions
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6
drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
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@ -2257,13 +2257,13 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
#if IS_ENABLED(CONFIG_BQL)
/* detect ITR changes that require update of TXDCTL.WTHRESH */
if ((adapter->tx_itr_setting > 1) &&
if ((adapter->tx_itr_setting != 1) &&
(adapter->tx_itr_setting < IXGBE_100K_ITR)) {
if ((tx_itr_prev == 1) ||
(tx_itr_prev > IXGBE_100K_ITR))
(tx_itr_prev >= IXGBE_100K_ITR))
need_reset = true;
} else {
if ((tx_itr_prev > 1) &&
if ((tx_itr_prev != 1) &&
(tx_itr_prev < IXGBE_100K_ITR))
need_reset = true;
}