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Message-ID: <1572868728-5211-2-git-send-email-akiyano@amazon.com>
Date: Mon, 4 Nov 2019 13:58:47 +0200
From: <akiyano@...zon.com>
To: <davem@...emloft.net>, <netdev@...r.kernel.org>
CC: Arthur Kiyanovski <akiyano@...zon.com>, <dwmw@...zon.com>,
<zorik@...zon.com>, <matua@...zon.com>, <saeedb@...zon.com>,
<msw@...zon.com>, <aliguori@...zon.com>, <nafea@...zon.com>,
<gtzalik@...zon.com>, <netanel@...zon.com>, <alisaidi@...zon.com>,
<benh@...zon.com>, <ndagan@...zon.com>, <shayagr@...zon.com>
Subject: [PATCH V1 net 1/2] net: ena: fix issues in setting interrupt moderation params in ethtool
From: Arthur Kiyanovski <akiyano@...zon.com>
Issue 1:
--------
Reproduction steps:
1. sudo ethtool -C eth0 rx-usecs 128
2. sudo ethtool -C eth0 adaptive-rx on
3. sudo ethtool -C eth0 adaptive-rx off
4. ethtool -c eth0
expected output: rx-usecs 128
actual output: rx-usecs 0
Reason for issue:
In stage 3, ethtool userspace calls first the ena_get_coalesce() handler
to get the current value of all properties, and then the ena_set_coalesce()
handler. When ena_get_coalesce() is called the adaptive interrupt
moderation is still on. There is an if in the code that returns the
rx_coalesce_usecs only if the adaptive interrupt moderation is off.
And since it is still on, rx_coalesce_usecs is not set, meaning it
stays 0.
Solution to issue:
Remove this if static interrupt moderation intervals have nothing to do with
dynamic ones.
Issue 2:
--------
Reproduction steps:
1. sudo ethtool -C eth0 rx-usecs 128
2. sudo ethtool -C eth0 adaptive-rx on
3. sudo ethtool -C eth0 rx-usecs 128
4. ethtool -c eth0
expected output: rx-usecs 128
actual output: rx-usecs 0
Reason for issue:
In stage 3, when ena_set_coalesce() is called, the handler tests if
rx adaptive interrupt moderation is on, and if it is, it returns before
getting to the part in the function that sets the rx non-adaptive
interrupt moderation interval.
Solution to issue:
Remove the return from the function when rx adaptive interrupt moderation
is on.
Additional small fixes in this commit:
--------------------------------------
1. Remove 2 unnecessary comments.
2. Remove 4 unnecesary "{}" in single row if statements.
3. Reorder ena_set_coalesce() to make sense.
4. Change the names of ena_update_tx/rx_rings_intr_moderation()
functions to ena_update_tx/rx_rings_nonadaptive_intr_moderation() for
clarity.
Signed-off-by: Arthur Kiyanovski <akiyano@...zon.com>
---
drivers/net/ethernet/amazon/ena/ena_ethtool.c | 40 ++++++++-----------
1 file changed, 16 insertions(+), 24 deletions(-)
diff --git a/drivers/net/ethernet/amazon/ena/ena_ethtool.c b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
index 16553d92fad2..b042c70504cd 100644
--- a/drivers/net/ethernet/amazon/ena/ena_ethtool.c
+++ b/drivers/net/ethernet/amazon/ena/ena_ethtool.c
@@ -306,19 +306,16 @@ static int ena_get_coalesce(struct net_device *net_dev,
struct ena_adapter *adapter = netdev_priv(net_dev);
struct ena_com_dev *ena_dev = adapter->ena_dev;
- if (!ena_com_interrupt_moderation_supported(ena_dev)) {
- /* the devie doesn't support interrupt moderation */
+ if (!ena_com_interrupt_moderation_supported(ena_dev))
return -EOPNOTSUPP;
- }
coalesce->tx_coalesce_usecs =
ena_com_get_nonadaptive_moderation_interval_tx(ena_dev) *
ena_dev->intr_delay_resolution;
- if (!ena_com_get_adaptive_moderation_enabled(ena_dev))
- coalesce->rx_coalesce_usecs =
- ena_com_get_nonadaptive_moderation_interval_rx(ena_dev)
- * ena_dev->intr_delay_resolution;
+ coalesce->rx_coalesce_usecs =
+ ena_com_get_nonadaptive_moderation_interval_rx(ena_dev)
+ * ena_dev->intr_delay_resolution;
coalesce->use_adaptive_rx_coalesce =
ena_com_get_adaptive_moderation_enabled(ena_dev);
@@ -326,7 +323,7 @@ static int ena_get_coalesce(struct net_device *net_dev,
return 0;
}
-static void ena_update_tx_rings_intr_moderation(struct ena_adapter *adapter)
+static void ena_update_tx_rings_nonadaptive_intr_moderation(struct ena_adapter *adapter)
{
unsigned int val;
int i;
@@ -337,7 +334,7 @@ static void ena_update_tx_rings_intr_moderation(struct ena_adapter *adapter)
adapter->tx_ring[i].smoothed_interval = val;
}
-static void ena_update_rx_rings_intr_moderation(struct ena_adapter *adapter)
+static void ena_update_rx_rings_nonadaptive_intr_moderation(struct ena_adapter *adapter)
{
unsigned int val;
int i;
@@ -355,35 +352,30 @@ static int ena_set_coalesce(struct net_device *net_dev,
struct ena_com_dev *ena_dev = adapter->ena_dev;
int rc;
- if (!ena_com_interrupt_moderation_supported(ena_dev)) {
- /* the devie doesn't support interrupt moderation */
+ if (!ena_com_interrupt_moderation_supported(ena_dev))
return -EOPNOTSUPP;
- }
rc = ena_com_update_nonadaptive_moderation_interval_tx(ena_dev,
coalesce->tx_coalesce_usecs);
if (rc)
return rc;
- ena_update_tx_rings_intr_moderation(adapter);
-
- if (coalesce->use_adaptive_rx_coalesce) {
- if (!ena_com_get_adaptive_moderation_enabled(ena_dev))
- ena_com_enable_adaptive_moderation(ena_dev);
- return 0;
- }
+ ena_update_tx_rings_nonadaptive_intr_moderation(adapter);
rc = ena_com_update_nonadaptive_moderation_interval_rx(ena_dev,
coalesce->rx_coalesce_usecs);
if (rc)
return rc;
- ena_update_rx_rings_intr_moderation(adapter);
+ ena_update_rx_rings_nonadaptive_intr_moderation(adapter);
- if (!coalesce->use_adaptive_rx_coalesce) {
- if (ena_com_get_adaptive_moderation_enabled(ena_dev))
- ena_com_disable_adaptive_moderation(ena_dev);
- }
+ if ((coalesce->use_adaptive_rx_coalesce) &&
+ (!ena_com_get_adaptive_moderation_enabled(ena_dev)))
+ ena_com_enable_adaptive_moderation(ena_dev);
+
+ if ((!coalesce->use_adaptive_rx_coalesce) &&
+ (ena_com_get_adaptive_moderation_enabled(ena_dev)))
+ ena_com_disable_adaptive_moderation(ena_dev);
return 0;
}
--
2.17.1
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