netdev - [RFC PATCH v2 net-next 13/15] net: dsa: sja1105: Make HOSTPRIO a kernel config

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Date:   Fri, 30 Aug 2019 03:46:33 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     f.fainelli@...il.com, vivien.didelot@...il.com, andrew@...n.ch,
        davem@...emloft.net, vinicius.gomes@...el.com,
        vedang.patel@...el.com, richardcochran@...il.com
Cc:     weifeng.voon@...el.com, jiri@...lanox.com, m-karicheri2@...com,
        Jose.Abreu@...opsys.com, ilias.apalodimas@...aro.org,
        --to=jhs@...atatu.com, --to=xiyou.wangcong@...il.com,
        netdev@...r.kernel.org, Vladimir Oltean <olteanv@...il.com>
Subject: [RFC PATCH v2 net-next 13/15] net: dsa: sja1105: Make HOSTPRIO a kernel config

Unfortunately with this hardware, there is no way to transmit in-band
QoS hints with management frames (i.e. VLAN PCP is ignored). The traffic
class for these is fixed in the static config (which in turn requires a
reset to change).

With the new ability to add time gates for individual traffic classes,
there is a real danger that the user might unknowingly turn off the
traffic class for PTP, BPDUs, LLDP etc.

So we need to manage this situation the best we can. There isn't any
knob in Linux for this, and changing it at runtime probably isn't worth
it either. So just make the setting loud enough by promoting it to a
Kconfig, which the user can customize to their particular setup.

Signed-off-by: Vladimir Oltean <olteanv@...il.com>
---
 drivers/net/dsa/sja1105/Kconfig        | 9 +++++++++
 drivers/net/dsa/sja1105/sja1105_main.c | 2 +-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/sja1105/Kconfig b/drivers/net/dsa/sja1105/Kconfig
index 55424f39cb0d..4dc873e985e6 100644
--- a/drivers/net/dsa/sja1105/Kconfig
+++ b/drivers/net/dsa/sja1105/Kconfig
@@ -17,6 +17,15 @@ tristate "NXP SJA1105 Ethernet switch family support"
 	    - SJA1105R (Gen. 2, SGMII, No TT-Ethernet)
 	    - SJA1105S (Gen. 2, SGMII, TT-Ethernet)
 
+config NET_DSA_SJA1105_HOSTPRIO
+	int "Traffic class for management traffic"
+	range 0 7
+	default 7
+	depends on NET_DSA_SJA1105
+	help
+	  Configure the traffic class which will be used for management
+	  (link-local) traffic sent and received over switch ports.
+
 config NET_DSA_SJA1105_PTP
 	bool "Support for the PTP clock on the NXP SJA1105 Ethernet switch"
 	depends on NET_DSA_SJA1105
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 4b393782cc84..0c03347b6429 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -388,7 +388,7 @@ static int sja1105_init_general_params(struct sja1105_private *priv)
 		/* Priority queue for link-local management frames
 		 * (both ingress to and egress from CPU - PTP, STP etc)
 		 */
-		.hostprio = 7,
+		.hostprio = CONFIG_NET_DSA_SJA1105_HOSTPRIO,
 		.mac_fltres1 = SJA1105_LINKLOCAL_FILTER_A,
 		.mac_flt1    = SJA1105_LINKLOCAL_FILTER_A_MASK,
 		.incl_srcpt1 = false,
-- 
2.17.1