a87ae8a963
Add a couple of helpers to resolve negotiated flow control. Two helpers are provided: - linkmode_resolve_pause() which takes the link partner and local advertisements, and decodes whether we should enable TX or RX pause at the MAC. This is useful outside of phylib, e.g. in phylink. - phy_get_pause(), which returns the TX/RX enablement status for the current negotiation results of the PHY. This allows us to centralise the flow control resolution, rather than spreading it around. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#include <linux/linkmode.h>
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/**
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* linkmode_resolve_pause - resolve the allowable pause modes
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* @local_adv: local advertisement in ethtool format
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* @partner_adv: partner advertisement in ethtool format
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* @tx_pause: pointer to bool to indicate whether transmit pause should be
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* enabled.
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* @rx_pause: pointer to bool to indicate whether receive pause should be
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* enabled.
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*
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* Flow control is resolved according to our and the link partners
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* advertisements using the following drawn from the 802.3 specs:
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* Local device Link partner
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* Pause AsymDir Pause AsymDir Result
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* 0 X 0 X Disabled
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* 0 1 1 0 Disabled
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* 0 1 1 1 TX
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* 1 0 0 X Disabled
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* 1 X 1 X TX+RX
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* 1 1 0 1 RX
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*/
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void linkmode_resolve_pause(const unsigned long *local_adv,
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const unsigned long *partner_adv,
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bool *tx_pause, bool *rx_pause)
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{
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__ETHTOOL_DECLARE_LINK_MODE_MASK(m);
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linkmode_and(m, local_adv, partner_adv);
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if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, m)) {
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*tx_pause = true;
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*rx_pause = true;
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} else if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, m)) {
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*tx_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
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partner_adv);
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*rx_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
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local_adv);
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} else {
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*tx_pause = false;
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*rx_pause = false;
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}
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}
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EXPORT_SYMBOL_GPL(linkmode_resolve_pause);
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