| // 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); |
