From c04f90e592431489df114971ff025265d429e48f Mon Sep 17 00:00:00 2001 From: Rostislav Pehlivanov Date: Wed, 27 Jan 2016 18:33:30 +0000 Subject: [PATCH] ixgbe: add a callback to set the maximum transmit bitrate This commit adds a callback which allows to adjust the maximum transmit bitrate the card can output. This makes it possible to get a smooth traffic instead of the default burst-y behaviour when trying to output e.g. a video stream. Much of the logic needed to get a correct bcnrc_val was taken from the ixgbe_set_vf_rate_limit() function. Signed-off-by: Rostislav Pehlivanov Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 31 +++++++++++++++++++ .../net/ethernet/intel/ixgbe/ixgbe_sriov.c | 2 +- .../net/ethernet/intel/ixgbe/ixgbe_sriov.h | 1 + 3 files changed, 33 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c index 0f007d9a2a13..115656c690bf 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c @@ -1077,6 +1077,36 @@ static void ixgbe_tx_timeout_reset(struct ixgbe_adapter *adapter) } } +/** + * ixgbe_tx_maxrate - callback to set the maximum per-queue bitrate + **/ +static int ixgbe_tx_maxrate(struct net_device *netdev, + int queue_index, u32 maxrate) +{ + struct ixgbe_adapter *adapter = netdev_priv(netdev); + struct ixgbe_hw *hw = &adapter->hw; + u32 bcnrc_val = ixgbe_link_mbps(adapter); + + if (!maxrate) + return 0; + + /* Calculate the rate factor values to set */ + bcnrc_val <<= IXGBE_RTTBCNRC_RF_INT_SHIFT; + bcnrc_val /= maxrate; + + /* clear everything but the rate factor */ + bcnrc_val &= IXGBE_RTTBCNRC_RF_INT_MASK | + IXGBE_RTTBCNRC_RF_DEC_MASK; + + /* enable the rate scheduler */ + bcnrc_val |= IXGBE_RTTBCNRC_RS_ENA; + + IXGBE_WRITE_REG(hw, IXGBE_RTTDQSEL, queue_index); + IXGBE_WRITE_REG(hw, IXGBE_RTTBCNRC, bcnrc_val); + + return 0; +} + /** * ixgbe_clean_tx_irq - Reclaim resources after transmit completes * @q_vector: structure containing interrupt and ring information @@ -8807,6 +8837,7 @@ static const struct net_device_ops ixgbe_netdev_ops = { .ndo_set_mac_address = ixgbe_set_mac, .ndo_change_mtu = ixgbe_change_mtu, .ndo_tx_timeout = ixgbe_tx_timeout, + .ndo_set_tx_maxrate = ixgbe_tx_maxrate, .ndo_vlan_rx_add_vid = ixgbe_vlan_rx_add_vid, .ndo_vlan_rx_kill_vid = ixgbe_vlan_rx_kill_vid, .ndo_do_ioctl = ixgbe_ioctl, diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c index 4bc249632ec2..adcf00002483 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c @@ -1398,7 +1398,7 @@ out: return err; } -static int ixgbe_link_mbps(struct ixgbe_adapter *adapter) +int ixgbe_link_mbps(struct ixgbe_adapter *adapter) { switch (adapter->link_speed) { case IXGBE_LINK_SPEED_100_FULL: diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h index dad925706f4c..47e65e2f886a 100644 --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h @@ -44,6 +44,7 @@ void ixgbe_ping_all_vfs(struct ixgbe_adapter *adapter); int ixgbe_ndo_set_vf_mac(struct net_device *netdev, int queue, u8 *mac); int ixgbe_ndo_set_vf_vlan(struct net_device *netdev, int queue, u16 vlan, u8 qos); +int ixgbe_link_mbps(struct ixgbe_adapter *adapter); int ixgbe_ndo_set_vf_bw(struct net_device *netdev, int vf, int min_tx_rate, int max_tx_rate); int ixgbe_ndo_set_vf_spoofchk(struct net_device *netdev, int vf, bool setting);