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ixgbe: Add support for displaying the number of Tx/Rx channels 

This patch adds support for the ethtool get_channels operation.

Since the ixgbe driver has to support DCB as well as the other modes the
assumption I made here is that the number of channels in DCB modes refers
to the number of queues per traffic class, not the number of queues total.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Reviewed-by: John Fastabend <john.r.fastabend@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:
Alexander Duyck 2013-01-12 06:33:52 +00:00 committed by Jeff Kirsher
parent cca73c59c4
commit 5348c9dbf3
1 changed files with 72 additions and 0 deletions
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72
drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
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@ -2731,6 +2731,77 @@ static int ixgbe_get_ts_info(struct net_device *dev,
return 0;
}
static unsigned int ixgbe_max_channels(struct ixgbe_adapter *adapter)
{
unsigned int max_combined;
u8 tcs = netdev_get_num_tc(adapter->netdev);
if (!(adapter->flags & IXGBE_FLAG_MSIX_ENABLED)) {
/* We only support one q_vector without MSI-X */
max_combined = 1;
} else if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
/* SR-IOV currently only allows one queue on the PF */
max_combined = 1;
} else if (tcs > 1) {
/* For DCB report channels per traffic class */
if (adapter->hw.mac.type == ixgbe_mac_82598EB) {
/* 8 TC w/ 4 queues per TC */
max_combined = 4;
} else if (tcs > 4) {
/* 8 TC w/ 8 queues per TC */
max_combined = 8;
} else {
/* 4 TC w/ 16 queues per TC */
max_combined = 16;
}
} else if (adapter->atr_sample_rate) {
/* support up to 64 queues with ATR */
max_combined = IXGBE_MAX_FDIR_INDICES;
} else {
/* support up to 16 queues with RSS */
max_combined = IXGBE_MAX_RSS_INDICES;
}
return max_combined;
}
static void ixgbe_get_channels(struct net_device *dev,
struct ethtool_channels *ch)
{
struct ixgbe_adapter *adapter = netdev_priv(dev);
/* report maximum channels */
ch->max_combined = ixgbe_max_channels(adapter);
/* report info for other vector */
if (adapter->flags & IXGBE_FLAG_MSIX_ENABLED) {
ch->max_other = NON_Q_VECTORS;
ch->other_count = NON_Q_VECTORS;
}
/* record RSS queues */
ch->combined_count = adapter->ring_feature[RING_F_RSS].indices;
/* nothing else to report if RSS is disabled */
if (ch->combined_count == 1)
return;
/* we do not support ATR queueing if SR-IOV is enabled */
if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
return;
/* same thing goes for being DCB enabled */
if (netdev_get_num_tc(dev) > 1)
return;
/* if ATR is disabled we can exit */
if (!adapter->atr_sample_rate)
return;
/* report flow director queues as maximum channels */
ch->combined_count = adapter->ring_feature[RING_F_FDIR].indices;
}
static const struct ethtool_ops ixgbe_ethtool_ops = {
.get_settings = ixgbe_get_settings,
.set_settings = ixgbe_set_settings,
@ -2759,6 +2830,7 @@ static const struct ethtool_ops ixgbe_ethtool_ops = {
.set_coalesce = ixgbe_set_coalesce,
.get_rxnfc = ixgbe_get_rxnfc,
.set_rxnfc = ixgbe_set_rxnfc,
.get_channels = ixgbe_get_channels,
.get_ts_info = ixgbe_get_ts_info,
};