linux-kernel - [PATCH v2 net-next 10/10] net: dsa: sja1105: Increase priority of CPU-trapped frames

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Message-Id: <20190602213926.2290-11-olteanv@gmail.com>
Date:   Mon,  3 Jun 2019 00:39:26 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     f.fainelli@...il.com, vivien.didelot@...il.com, andrew@...n.ch,
        davem@...emloft.net, richardcochran@...il.com,
        john.stultz@...aro.org, tglx@...utronix.de, sboyd@...nel.org
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Vladimir Oltean <olteanv@...il.com>
Subject: [PATCH v2 net-next 10/10] net: dsa: sja1105: Increase priority of CPU-trapped frames

Without noticing any particular issue, this patch ensures that
management traffic is treated with the maximum priority on RX by the
switch.  This is generally desirable, as the driver keeps a state
machine that waits for metadata follow-up frames as soon as a management
frame is received.  Increasing the priority helps expedite the reception
(and further reconstruction) of the RX timestamp to the driver after the
MAC has generated it.

Signed-off-by: Vladimir Oltean <olteanv@...il.com>
---
Changes in v2:

None.

 drivers/net/dsa/sja1105/sja1105_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index b7af9479ab5a..6307e1c461be 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -389,7 +389,7 @@ static int sja1105_init_general_params(struct sja1105_private *priv)
 		.mirr_ptacu = 0,
 		.switchid = priv->ds->index,
 		/* Priority queue for link-local frames trapped to CPU */
-		.hostprio = 0,
+		.hostprio = 7,
 		.mac_fltres1 = SJA1105_LINKLOCAL_FILTER_A,
 		.mac_flt1    = SJA1105_LINKLOCAL_FILTER_A_MASK,
 		.incl_srcpt1 = false,
-- 
2.17.1