diff mbox series

[net,v3] net: sparx5: Add spinlock for frame transmission from CPU

Message ID 20240219080043.1561014-1-horatiu.vultur@microchip.com (mailing list archive)
State New, archived
Headers show
Series [net,v3] net: sparx5: Add spinlock for frame transmission from CPU | expand

Commit Message

Horatiu Vultur Feb. 19, 2024, 8 a.m. UTC 
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: f3cad2611a77 ("net: sparx5: add hostmode with phylink support")
---
v2->v3:
- add missing fix tag as it is targeting net
v1->v2:
- target net instead of net-next
---
 drivers/net/ethernet/microchip/sparx5/sparx5_main.c   | 1 +
 drivers/net/ethernet/microchip/sparx5/sparx5_main.h   | 1 +
 drivers/net/ethernet/microchip/sparx5/sparx5_packet.c | 2 ++
 3 files changed, 4 insertions(+)

Comments

patchwork-bot+netdevbpf@kernel.org Feb. 22, 2024, 1:20 a.m. UTC | #1 
Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 19 Feb 2024 09:00:43 +0100 you wrote:
> 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.
> 
> [...]

Here is the summary with links:
  - [net,v3] net: sparx5: Add spinlock for frame transmission from CPU
    https://git.kernel.org/netdev/net/c/603ead96582d

You are awesome, thank you!
diff mbox series

Patch

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
index d1f7fc8b1b71a..3c066b62e6894 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.c
@@ -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");
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_main.h b/drivers/net/ethernet/microchip/sparx5/sparx5_main.h
index 6f565c0c0c3dc..316fed5f27355 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_main.h
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_main.h
@@ -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 */
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c b/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
index 6db6ac6a3bbc2..ac7e1cffbcecf 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
@@ -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;