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// SPDX-License-Identifier: GPL-2.0+
#include <linux/linkmode.h>
/**
* linkmode_resolve_pause - resolve the allowable pause modes
* @local_adv: local advertisement in ethtool format
* @partner_adv: partner advertisement in ethtool format
* @tx_pause: pointer to bool to indicate whether transmit pause should be
* enabled.
* @rx_pause: pointer to bool to indicate whether receive pause should be
* enabled.
*
* Flow control is resolved according to our and the link partners
* advertisements using the following drawn from the 802.3 specs:
* Local device Link partner
* Pause AsymDir Pause AsymDir Result
* 0 X 0 X Disabled
* 0 1 1 0 Disabled
* 0 1 1 1 TX
* 1 0 0 X Disabled
* 1 X 1 X TX+RX
* 1 1 0 1 RX
*/
void linkmode_resolve_pause(const unsigned long *local_adv,
const unsigned long *partner_adv,
bool *tx_pause, bool *rx_pause)
{
__ETHTOOL_DECLARE_LINK_MODE_MASK(m);
linkmode_and(m, local_adv, partner_adv);
if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, m)) {
*tx_pause = true;
*rx_pause = true;
} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, m)) {
*tx_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
partner_adv);
*rx_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
local_adv);
} else {
*tx_pause = false;
*rx_pause = false;
}
}
EXPORT_SYMBOL_GPL(linkmode_resolve_pause);
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