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net: sparx5: Add spinlock for frame transmission from CPU

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Both registers used when doing manual injection or fdma injection are
shared between all the net devices of the switch. It was noticed that
when having two process which each of them trying to inject frames on
different ethernet ports, that the HW started to behave strange, by
sending out more frames then expected. When doing fdma injection it is
required to set the frame in the DCB and then make sure that the next
pointer of the last DCB is invalid. But because there is no locks for
this, then easily this pointer between the DCB can be broken and then it
would create a loop of DCBs. And that means that the HW will
continuously transmit these frames in a loop. Until the SW will break
this loop.
Therefore to fix this issue, add a spin lock for when accessing the
registers for manual or fdma injection.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Daniel Machon <daniel.machon@microchip.com>
Fixes: f3cad2611a ("net: sparx5: add hostmode with phylink support")
Link: https://lore.kernel.org/r/20240219080043.1561014-1-horatiu.vultur@microchip.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Horatiu Vultur 2024-02-19 09:00:43 +01:00 • committed by Jakub Kicinski
parent 1fde0ca3a0
commit 603ead9658
3 changed files with 4 additions and 0 deletions
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1
drivers/net/ethernet/microchip/sparx5/sparx5_main.c
View file

@ -757,6 +757,7 @@ static int mchp_sparx5_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, sparx5);
sparx5->pdev = pdev;
sparx5->dev = &pdev->dev;
spin_lock_init(&sparx5->tx_lock);
/* Do switch core reset if available */
reset = devm_reset_control_get_optional_shared(&pdev->dev, "switch");

1
drivers/net/ethernet/microchip/sparx5/sparx5_main.h
View file

@ -280,6 +280,7 @@ struct sparx5 {
int xtr_irq;
/* Frame DMA */
int fdma_irq;
spinlock_t tx_lock; /* lock for frame transmission */
struct sparx5_rx rx;
struct sparx5_tx tx;
/* PTP */

2
drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
View file

@ -244,10 +244,12 @@ netdev_tx_t sparx5_port_xmit_impl(struct sk_buff *skb, struct net_device *dev)
}
skb_tx_timestamp(skb);
spin_lock(&sparx5->tx_lock);
if (sparx5->fdma_irq > 0)
ret = sparx5_fdma_xmit(sparx5, ifh, skb);
else
ret = sparx5_inject(sparx5, ifh, skb, dev);
spin_unlock(&sparx5->tx_lock);
if (ret == -EBUSY)
goto busy;