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ice: fix overwriting TX/RX descriptor values when rebuilding VSI 

If a user sets the value of the TX or RX descriptors to some non-default
value using 'ethtool -G' then we need to not overwrite the values when
we rebuild the VSI. The VSI rebuild could happen as a result of a user
setting the number of queues via the 'ethtool -L' command. Fix this by
checking to see if the value we have stored is non-zero and if it is
then don't change the value.

Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Paul M Stillwell Jr 2020-07-13 13:53:09 -07:00 committed by Tony Nguyen
parent ca1fdb885e
commit a02016de00
1 changed files with 8 additions and 2 deletions
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10
drivers/net/ethernet/intel/ice/ice_lib.c
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@ -127,8 +127,14 @@ static void ice_vsi_set_num_desc(struct ice_vsi *vsi)
case ICE_VSI_PF: case ICE_VSI_PF:
case ICE_VSI_CTRL: case ICE_VSI_CTRL:
case ICE_VSI_LB: case ICE_VSI_LB:
vsi->num_rx_desc = ICE_DFLT_NUM_RX_DESC; /* a user could change the values of num_[tr]x_desc using
vsi->num_tx_desc = ICE_DFLT_NUM_TX_DESC; * ethtool -G so we should keep those values instead of
* overwriting them with the defaults.
*/
if (!vsi->num_rx_desc)
vsi->num_rx_desc = ICE_DFLT_NUM_RX_DESC;
if (!vsi->num_tx_desc)
vsi->num_tx_desc = ICE_DFLT_NUM_TX_DESC;
break; break;
default: default:
dev_dbg(ice_pf_to_dev(vsi->back), "Not setting number of Tx/Rx descriptors for VSI type %d\n", dev_dbg(ice_pf_to_dev(vsi->back), "Not setting number of Tx/Rx descriptors for VSI type %d\n",