From e6ac0cec5b03cdba63850ec384161212123bd3ce Mon Sep 17 00:00:00 2001 From: Ivan Vecera Date: Fri, 14 Jun 2019 17:48:36 +0200 Subject: [PATCH] be2net: Fix number of Rx queues used for flow hashing [ Upstream commit 718f4a2537089ea41903bf357071306163bc7c04 ] Number of Rx queues used for flow hashing returned by the driver is incorrect and this bug prevents user to use the last Rx queue in indirection table. Let's say we have a NIC with 6 combined queues: [root@sm-03 ~]# ethtool -l enp4s0f0 Channel parameters for enp4s0f0: Pre-set maximums: RX: 5 TX: 5 Other: 0 Combined: 6 Current hardware settings: RX: 0 TX: 0 Other: 0 Combined: 6 Default indirection table maps all (6) queues equally but the driver reports only 5 rings available. [root@sm-03 ~]# ethtool -x enp4s0f0 RX flow hash indirection table for enp4s0f0 with 5 RX ring(s): 0: 0 1 2 3 4 5 0 1 8: 2 3 4 5 0 1 2 3 16: 4 5 0 1 2 3 4 5 24: 0 1 2 3 4 5 0 1 ... Now change indirection table somehow: [root@sm-03 ~]# ethtool -X enp4s0f0 weight 1 1 [root@sm-03 ~]# ethtool -x enp4s0f0 RX flow hash indirection table for enp4s0f0 with 6 RX ring(s): 0: 0 0 0 0 0 0 0 0 ... 64: 1 1 1 1 1 1 1 1 ... Now it is not possible to change mapping back to equal (default) state: [root@sm-03 ~]# ethtool -X enp4s0f0 equal 6 Cannot set RX flow hash configuration: Invalid argument Fixes: 594ad54a2c3b ("be2net: Add support for setting and getting rx flow hash options") Reported-by: Tianhao Signed-off-by: Ivan Vecera Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/emulex/benet/be_ethtool.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/emulex/benet/be_ethtool.c b/drivers/net/ethernet/emulex/benet/be_ethtool.c index 0a48a31..3458181 100644 --- a/drivers/net/ethernet/emulex/benet/be_ethtool.c +++ b/drivers/net/ethernet/emulex/benet/be_ethtool.c @@ -1108,7 +1108,7 @@ static int be_get_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd, cmd->data = be_get_rss_hash_opts(adapter, cmd->flow_type); break; case ETHTOOL_GRXRINGS: - cmd->data = adapter->num_rx_qs - 1; + cmd->data = adapter->num_rx_qs; break; default: return -EINVAL; -- 2.7.4