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Commit 44781fef authored Mar 31, 2017 by Joao Pinto Committed by David S. Miller Apr 02, 2017

net: stmmac: fix cbs configuration



Sending again, because forgot to include net-dev.

The QoS IP does not accept AVB capabilities to default/queue 0, this way we
guarantee 75% bandwidth for AVB. This patch assures that only queues >= 1
gets CBS confgured. Additional info was also added to stmmac.txt.

Reported-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Joao Pinto <jpinto@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent a6fc09df

Documentation/devicetree/bindings/net/stmmac.txt

+2 −0

Original line number	Diff line number	Diff line
		@@ -103,6 +103,8 @@ Optional properties:
		- Choose one of these modes:
		- snps,dcb-algorithm: TX queue will be working in DCB
		- snps,avb-algorithm: TX queue will be working in AVB
		[Attention] Queue 0 is reserved for legacy traffic
		and so no AVB is available in this queue.
		- Configure Credit Base Shaper (if AVB Mode selected):
		- snps,send_slope: enable Low Power Interface
		- snps,idle_slope: unlock on WoL

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1880,7 +1880,8 @@ static void stmmac_configure_cbs(struct stmmac_priv *priv)
		u32 mode_to_use;
		u32 queue;

		for (queue = 0; queue < tx_queues_count; queue++) {
		/* queue 0 is reserved for legacy traffic */
		for (queue = 1; queue < tx_queues_count; queue++) {
		mode_to_use = priv->plat->tx_queues_cfg[queue].mode_to_use;
		if (mode_to_use == MTL_QUEUE_DCB)
		continue;