[PATCH V1 net-next 11/11] net: ena: fix incorrect update of intr_delay_resolution
From: <akiyano@amazon.com>
Date: 2019-09-12 22:11:04
Subsystem:
amazon ethernet drivers, networking drivers, the rest · Maintainers:
Arthur Kiyanovski, David Arinzon, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Arthur Kiyanovski <akiyano@amazon.com> ena_dev->intr_moder_rx/tx_interval save the intervals received from the user after dividing them by ena_dev->intr_delay_resolution. Therefore when intr_delay_resolution changes, the code needs to first mutiply intr_moder_rx/tx_interval by the previous intr_delay_resolution to get the value originally given by the user, and only then divide it by the new intr_delay_resolution. Current code does not first multiply intr_moder_rx/tx_interval by the old intr_delay_resolution. This commit fixes it. Also initialize ena_dev->intr_delay_resolution to be 1. Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com> --- drivers/net/ethernet/amazon/ena/ena_com.c | 22 +++++++++++++++----- drivers/net/ethernet/amazon/ena/ena_com.h | 1 + drivers/net/ethernet/amazon/ena/ena_netdev.c | 1 + 3 files changed, 19 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c
index c3f4846aa845..ea62604fdf8c 100644
--- a/drivers/net/ethernet/amazon/ena/ena_com.c
+++ b/drivers/net/ethernet/amazon/ena/ena_com.c@@ -1281,18 +1281,30 @@ static int ena_com_ind_tbl_convert_from_device(struct ena_com_dev *ena_dev) static void ena_com_update_intr_delay_resolution(struct ena_com_dev *ena_dev, u16 intr_delay_resolution) { + /* Initial value of intr_delay_resolution might be 0 */ + u16 prev_intr_delay_resolution = + ena_dev->intr_delay_resolution ? + ena_dev->intr_delay_resolution : + ENA_DEFAULT_INTR_DELAY_RESOLUTION; + if (!intr_delay_resolution) { pr_err("Illegal intr_delay_resolution provided. Going to use default 1 usec resolution\n"); - intr_delay_resolution = 1; + intr_delay_resolution = ENA_DEFAULT_INTR_DELAY_RESOLUTION; } - ena_dev->intr_delay_resolution = intr_delay_resolution; /* update Rx */ - ena_dev->intr_moder_rx_interval /= intr_delay_resolution; - + ena_dev->intr_moder_rx_interval = + ena_dev->intr_moder_rx_interval * + prev_intr_delay_resolution / + intr_delay_resolution; /* update Tx */ - ena_dev->intr_moder_tx_interval /= intr_delay_resolution; + ena_dev->intr_moder_tx_interval = + ena_dev->intr_moder_tx_interval * + prev_intr_delay_resolution / + intr_delay_resolution; + + ena_dev->intr_delay_resolution = intr_delay_resolution; } /*****************************************************************************/
diff --git a/drivers/net/ethernet/amazon/ena/ena_com.h b/drivers/net/ethernet/amazon/ena/ena_com.h
index ddc2a8c50333..7c941eba0bc9 100644
--- a/drivers/net/ethernet/amazon/ena/ena_com.h
+++ b/drivers/net/ethernet/amazon/ena/ena_com.h@@ -74,6 +74,7 @@ #define ENA_INTR_INITIAL_TX_INTERVAL_USECS 196 #define ENA_INTR_INITIAL_RX_INTERVAL_USECS 0 +#define ENA_DEFAULT_INTR_DELAY_RESOLUTION 1 #define ENA_HW_HINTS_NO_TIMEOUT 0xFFFF
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 617f51890449..25f70a59d42f 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c@@ -3501,6 +3501,7 @@ static int ena_probe(struct pci_dev *pdev, const struct pci_device_id *ent) */ ena_dev->intr_moder_tx_interval = ENA_INTR_INITIAL_TX_INTERVAL_USECS; ena_dev->intr_moder_rx_interval = ENA_INTR_INITIAL_RX_INTERVAL_USECS; + ena_dev->intr_delay_resolution = ENA_DEFAULT_INTR_DELAY_RESOLUTION; io_queue_num = ena_calc_io_queue_num(pdev, ena_dev, &get_feat_ctx); rc = ena_calc_queue_size(&calc_queue_ctx); if (rc || io_queue_num <= 0) {
--
2.17.2