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net: phylink: Fix flow control resolution

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[ Upstream commit 63b2ed4e10b2e6c913e1d8cdd728e7fba4115a3d ]

Regarding to IEEE 802.3-2015 standard section 2
28B.3 Priority resolution - Table 28-3 - Pause resolution

In case of Local device Pause=1 AsymDir=0, Link partner
Pause=1 AsymDir=1, Local device resolution should be enable PAUSE
transmit, disable PAUSE receive.
And in case of Local device Pause=1 AsymDir=1, Link partner
Pause=1 AsymDir=0, Local device resolution should be enable PAUSE
receive, disable PAUSE transmit.

Fixes: 9525ae83959b ("phylink: add phylink infrastructure")
Signed-off-by: Stefan Chulski <stefanc@marvell.com>
Reported-by: Shaul Ben-Mayor <shaulb@marvell.com>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stefan Chulski 2019-09-05 19:46:18 +03:00 committed by Greg Kroah-Hartman
parent 55fb612bef
commit 37a791c19a
1 changed files with 3 additions and 3 deletions
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6
drivers/net/phy/phylink.c
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@ -359,8 +359,8 @@ static void phylink_get_fixed_state(struct phylink *pl, struct phylink_link_stat
* Local device Link partner
* Pause AsymDir Pause AsymDir Result
* 1 X 1 X TX+RX
* 0 1 1 1 RX
* 1 1 0 1 TX
* 0 1 1 1 TX
* 1 1 0 1 RX
*/
static void phylink_resolve_flow(struct phylink *pl,
struct phylink_link_state *state)
@ -381,7 +381,7 @@ static void phylink_resolve_flow(struct phylink *pl,
new_pause = MLO_PAUSE_TX | MLO_PAUSE_RX;
else if (pause & MLO_PAUSE_ASYM)
new_pause = state->pause & MLO_PAUSE_SYM ?
MLO_PAUSE_RX : MLO_PAUSE_TX;
MLO_PAUSE_TX : MLO_PAUSE_RX;
} else {
new_pause = pl->link_config.pause & MLO_PAUSE_TXRX_MASK;
}