On Tue, Mar 21, 2017 at 03:18:20PM +0000, Joao Pinto wrote: > Às 3:12 PM de 3/21/2017, Thierry Reding escreveu: > > From: Thierry Reding <tred...@nvidia.com> > > > > The MAC RX queues always need to be enabled in order to receive network > > packets. Remove the condition that this only needs to be done for multi- > > queue configurations. > > > > Signed-off-by: Thierry Reding <tred...@nvidia.com> > > --- > > drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > index d3a21519e4c0..298956032098 100644 > > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c > > @@ -1943,7 +1943,7 @@ static void stmmac_mtl_configuration(struct > > stmmac_priv *priv) > > stmmac_rx_queue_dma_chan_map(priv); > > > > /* Enable MAC RX Queues */ > > - if (rx_queues_count > 1 && priv->hw->mac->rx_queue_enable) > > + if (priv->hw->mac->rx_queue_enable) > > stmmac_mac_enable_rx_queues(priv); > > > > /* Set the HW DMA mode and the COE */ > > > > This text is from the Databook: > > "In multiple Rx queues configuration, all the queues are disabled by default. > Enable the Rx queue by programming the corresponding field in this register." > > So by theory, only multiple queue configured cores needs the enable operation.
But that's related to multiple queues configured in the core when it was instantiated (i.e. the capabilities). rx_queues_count reflects the number of queues enabled in the driver, so it can be 1 even if the core itself supports more than one queue. In that case, we still want to enable the MAC RX queue because it will otherwise remain disabled. > > >>> But came to my attention a setup that has 1 RX queue and 2 TX queues, > >>> which > enables multiple queues mechanism inside the core (even with 1 RX) and so RX > needs to be enabled. Because of that I agree with this patch. > > Acked-By: Joao Pinto <jpi...@synopsys.com> Yeah, that case would also require this patch. Thierry
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