| Message ID | 20240215083333.2139380-1-horatiu.vultur@microchip.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [net,v2] net: sparx5: Add spinlock for frame transmission from CPU | expand |
The 02/15/2024 09:33, Horatiu Vultur 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. > > Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com> > Reviewed-by: Daniel Machon <daniel.machon@microchip.com> Argh... I forgot to add the Fixes tag: Fixes: f3cad2611a77 ("net: sparx5: add hostmode with phylink support") > --- > 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(+) > > 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; > -- > 2.34.1 >
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;