iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

net: dsa: mt7530: Change the LINK bit to reflect the link status

Browse Source 
[ Upstream commit 22259471b51925353bd7b16f864c79fdd76e425e ]

Andrew reported:

After a number of network port link up/down changes, sometimes the switch
port gets stuck in a state where it thinks it is still transmitting packets
but the cpu port is not actually transmitting anymore. In this state you
will see a message on the console
"mtk_soc_eth 1e100000.ethernet eth0: transmit timed out" and the Tx counter
in ifconfig will be incrementing on virtual port, but not incrementing on
cpu port.

The issue is that MAC TX/RX status has no impact on the link status or
queue manager of the switch. So the queue manager just queues up packets
of a disabled port and sends out pause frames when the queue is full.

Change the LINK bit to reflect the link status.

Fixes: b8f126a8d543 ("net-next: dsa: add dsa support for Mediatek MT7530 switch")
Reported-by: Andrew Smith <andrew.smith@digi.com>
Signed-off-by: René van Dorst <opensource@vdorst.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
René van Dorst 2020-03-19 14:47:56 +01:00 committed by Greg Kroah-Hartman
parent f9c4773768
commit bee69eac47
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/dsa/mt7530.c
View File

@ -549,7 +549,7 @@ mt7530_mib_reset(struct dsa_switch *ds)
static void
mt7530_port_set_status(struct mt7530_priv *priv, int port, int enable)
{
u32 mask = PMCR_TX_EN | PMCR_RX_EN;
u32 mask = PMCR_TX_EN | PMCR_RX_EN | PMCR_FORCE_LNK;
if (enable)
mt7530_set(priv, MT7530_PMCR_P(port), mask);