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Commit c04f90e5 authored by Rostislav Pehlivanov's avatar Rostislav Pehlivanov Committed by Jeff Kirsher
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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: default avatarRostislav Pehlivanov <atomnuker@gmail.com>
Tested-by: default avatarAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent afdc71e4

drivers/net/ethernet/intel/ixgbe/ixgbe_main.c

+31 −0
Original line number Diff line number Diff line
@@ -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,

drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c

+1 −1
Original line number Diff line number Diff line
@@ -1398,7 +1398,7 @@ int ixgbe_ndo_set_vf_vlan(struct net_device *netdev, int vf, u16 vlan, u8 qos) 
	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:

drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.h

+1 −0
Original line number Diff line number Diff line
@@ -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);