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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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