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Date: Wed, 15 Jul 2015 15:34:40 +0530
From: Govindarajulu Varadarajan <_govind@....com>
To: davem@...emloft.net, netdev@...r.kernel.org
Cc: ssujith@...co.com, benve@...co.com,
Govindarajulu Varadarajan <_govind@....com>
Subject: [PATCH net-next 2/2] enic: allow adaptive coalesce setting for msi/legacy intr
* Allow setting of adaptive coalescing setting for all types of interrupt.
* In msi & legacy intr, we use single interrupt for rx & tx. In this case
tx_coalesce_usecs is invalid. We should use only rx_coalesce_usecs.
Do not display tx_coal values for msi/intx. And do not allow user to set
this as well.
* Driver supports only tx/rx_coalesce_usec and adaptive coalesce settings.
For other values, driver does not return error. So ethtool succeeds for
unsupported values. Introduce enic_coalesce_valid() function to validate
the coalescing values.
* If user requests for coalesce value greater than what adaptor supports,
driver uses the max value. We should at least log this.
Signed-off-by: Govindarajulu Varadarajan <_govind@....com>
---
drivers/net/ethernet/cisco/enic/enic_ethtool.c | 113 ++++++++++++++-----------
1 file changed, 65 insertions(+), 48 deletions(-)
diff --git a/drivers/net/ethernet/cisco/enic/enic_ethtool.c b/drivers/net/ethernet/cisco/enic/enic_ethtool.c
index f3f1601..f44a39c 100644
--- a/drivers/net/ethernet/cisco/enic/enic_ethtool.c
+++ b/drivers/net/ethernet/cisco/enic/enic_ethtool.c
@@ -224,7 +224,8 @@ static int enic_get_coalesce(struct net_device *netdev,
struct enic *enic = netdev_priv(netdev);
struct enic_rx_coal *rxcoal = &enic->rx_coalesce_setting;
- ecmd->tx_coalesce_usecs = enic->tx_coalesce_usecs;
+ if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
+ ecmd->tx_coalesce_usecs = enic->tx_coalesce_usecs;
ecmd->rx_coalesce_usecs = enic->rx_coalesce_usecs;
if (rxcoal->use_adaptive_rx_coalesce)
ecmd->use_adaptive_rx_coalesce = 1;
@@ -234,6 +235,53 @@ static int enic_get_coalesce(struct net_device *netdev,
return 0;
}
+static int enic_coalesce_valid(struct enic *enic,
+ struct ethtool_coalesce *ec)
+{
+ u32 coalesce_usecs_max = vnic_dev_get_intr_coal_timer_max(enic->vdev);
+ u32 rx_coalesce_usecs_high = min_t(u32, coalesce_usecs_max,
+ ec->rx_coalesce_usecs_high);
+ u32 rx_coalesce_usecs_low = min_t(u32, coalesce_usecs_max,
+ ec->rx_coalesce_usecs_low);
+
+ if (ec->rx_max_coalesced_frames ||
+ ec->rx_coalesce_usecs_irq ||
+ ec->rx_max_coalesced_frames_irq ||
+ ec->tx_max_coalesced_frames ||
+ ec->tx_coalesce_usecs_irq ||
+ ec->tx_max_coalesced_frames_irq ||
+ ec->stats_block_coalesce_usecs ||
+ ec->use_adaptive_tx_coalesce ||
+ ec->pkt_rate_low ||
+ ec->rx_max_coalesced_frames_low ||
+ ec->tx_coalesce_usecs_low ||
+ ec->tx_max_coalesced_frames_low ||
+ ec->pkt_rate_high ||
+ ec->rx_max_coalesced_frames_high ||
+ ec->tx_coalesce_usecs_high ||
+ ec->tx_max_coalesced_frames_high ||
+ ec->rate_sample_interval)
+ return -EINVAL;
+
+ if ((vnic_dev_get_intr_mode(enic->vdev) != VNIC_DEV_INTR_MODE_MSIX) &&
+ ec->tx_coalesce_usecs)
+ return -EINVAL;
+
+ if ((ec->tx_coalesce_usecs > coalesce_usecs_max) ||
+ (ec->rx_coalesce_usecs > coalesce_usecs_max) ||
+ (ec->rx_coalesce_usecs_low > coalesce_usecs_max) ||
+ (ec->rx_coalesce_usecs_high > coalesce_usecs_max))
+ netdev_info(enic->netdev, "ethtool_set_coalesce: adaptor supports max coalesce value of %d. Setting max value.\n",
+ coalesce_usecs_max);
+
+ if (ec->rx_coalesce_usecs_high &&
+ (rx_coalesce_usecs_high <
+ rx_coalesce_usecs_low + ENIC_AIC_LARGE_PKT_DIFF))
+ return -EINVAL;
+
+ return 0;
+}
+
static int enic_set_coalesce(struct net_device *netdev,
struct ethtool_coalesce *ecmd)
{
@@ -244,8 +292,12 @@ static int enic_set_coalesce(struct net_device *netdev,
u32 rx_coalesce_usecs_high;
u32 coalesce_usecs_max;
unsigned int i, intr;
+ int ret;
struct enic_rx_coal *rxcoal = &enic->rx_coalesce_setting;
+ ret = enic_coalesce_valid(enic, ecmd);
+ if (ret)
+ return ret;
coalesce_usecs_max = vnic_dev_get_intr_coal_timer_max(enic->vdev);
tx_coalesce_usecs = min_t(u32, ecmd->tx_coalesce_usecs,
coalesce_usecs_max);
@@ -257,59 +309,24 @@ static int enic_set_coalesce(struct net_device *netdev,
rx_coalesce_usecs_high = min_t(u32, ecmd->rx_coalesce_usecs_high,
coalesce_usecs_max);
- switch (vnic_dev_get_intr_mode(enic->vdev)) {
- case VNIC_DEV_INTR_MODE_INTX:
- if (tx_coalesce_usecs != rx_coalesce_usecs)
- return -EINVAL;
- if (ecmd->use_adaptive_rx_coalesce ||
- ecmd->rx_coalesce_usecs_low ||
- ecmd->rx_coalesce_usecs_high)
- return -EINVAL;
-
- intr = enic_legacy_io_intr();
- vnic_intr_coalescing_timer_set(&enic->intr[intr],
- tx_coalesce_usecs);
- break;
- case VNIC_DEV_INTR_MODE_MSI:
- if (tx_coalesce_usecs != rx_coalesce_usecs)
- return -EINVAL;
- if (ecmd->use_adaptive_rx_coalesce ||
- ecmd->rx_coalesce_usecs_low ||
- ecmd->rx_coalesce_usecs_high)
- return -EINVAL;
-
- vnic_intr_coalescing_timer_set(&enic->intr[0],
- tx_coalesce_usecs);
- break;
- case VNIC_DEV_INTR_MODE_MSIX:
- if (ecmd->rx_coalesce_usecs_high &&
- (rx_coalesce_usecs_high <
- rx_coalesce_usecs_low + ENIC_AIC_LARGE_PKT_DIFF))
- return -EINVAL;
-
+ if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) {
for (i = 0; i < enic->wq_count; i++) {
intr = enic_msix_wq_intr(enic, i);
vnic_intr_coalescing_timer_set(&enic->intr[intr],
- tx_coalesce_usecs);
- }
-
- rxcoal->use_adaptive_rx_coalesce =
- !!ecmd->use_adaptive_rx_coalesce;
- if (!rxcoal->use_adaptive_rx_coalesce)
- enic_intr_coal_set_rx(enic, rx_coalesce_usecs);
-
- if (ecmd->rx_coalesce_usecs_high) {
- rxcoal->range_end = rx_coalesce_usecs_high;
- rxcoal->small_pkt_range_start = rx_coalesce_usecs_low;
- rxcoal->large_pkt_range_start = rx_coalesce_usecs_low +
- ENIC_AIC_LARGE_PKT_DIFF;
+ tx_coalesce_usecs);
}
- break;
- default:
- break;
+ enic->tx_coalesce_usecs = tx_coalesce_usecs;
+ }
+ rxcoal->use_adaptive_rx_coalesce = !!ecmd->use_adaptive_rx_coalesce;
+ if (!rxcoal->use_adaptive_rx_coalesce)
+ enic_intr_coal_set_rx(enic, rx_coalesce_usecs);
+ if (ecmd->rx_coalesce_usecs_high) {
+ rxcoal->range_end = rx_coalesce_usecs_high;
+ rxcoal->small_pkt_range_start = rx_coalesce_usecs_low;
+ rxcoal->large_pkt_range_start = rx_coalesce_usecs_low +
+ ENIC_AIC_LARGE_PKT_DIFF;
}
- enic->tx_coalesce_usecs = tx_coalesce_usecs;
enic->rx_coalesce_usecs = rx_coalesce_usecs;
return 0;
--
2.4.5
--
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