[PATCH v1 0/2] net: bcmgenet: add support for GRO software interrupt coalescing

[PATCH v1 0/2] net: bcmgenet: add support for GRO software interrupt coalescing

[Zak Kemble]

Hey, these patches enable support for software IRQ coalescing and GRO
aggregation and applies conservative defaults which can help improve
system and network performance by reducing the number of hardware
interrupts and improving GRO aggregation ratio.

Zak Kemble (2):
  net: bcmgenet: use napi_complete_done return value
  net: bcmgenet: enable GRO software interrupt coalescing by default

 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
2.39.5

[PATCH v1 1/2] net: bcmgenet: use napi_complete_done return value

[Zak Kemble]

Make use of the return value from napi_complete_done(). This allows users to
use the gro_flush_timeout and napi_defer_hard_irqs sysfs attributes for
configuring software interrupt coalescing.

Signed-off-by: Zak Kemble <zakkemble@gmail.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index fa0077bc6..cc9bdd244 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -2472,10 +2472,8 @@ static int bcmgenet_rx_poll(struct napi_struct *napi, int budget)
 
 	work_done = bcmgenet_desc_rx(ring, budget);
 
-	if (work_done < budget) {
-		napi_complete_done(napi, work_done);
+	if (work_done < budget && napi_complete_done(napi, work_done))
 		bcmgenet_rx_ring_int_enable(ring);
-	}
 
 	if (ring->dim.use_dim) {
 		dim_update_sample(ring->dim.event_ctr, ring->dim.packets,
-- 
2.39.5

[PATCH v1 2/2] net: bcmgenet: enable GRO software interrupt coalescing by default

[Zak Kemble]

Apply conservative defaults.

Signed-off-by: Zak Kemble <zakkemble@gmail.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index cc9bdd244..4f40f6afe 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -3986,6 +3986,8 @@ static int bcmgenet_probe(struct platform_device *pdev)
 	dev->hw_features |= dev->features;
 	dev->vlan_features |= dev->features;
 
+	netdev_sw_irq_coalesce_default_on(dev);
+
 	/* Request the WOL interrupt and advertise suspend if available */
 	priv->wol_irq_disabled = true;
 	if (priv->wol_irq > 0) {
-- 
2.39.5

Re: [PATCH v1 0/2] net: bcmgenet: add support for GRO software interrupt coalescing

[Florian Fainelli]

Hi Zak,

On 5/31/25 15:48, Zak Kemble wrote:
> Hey, these patches enable support for software IRQ coalescing and GRO
> aggregation and applies conservative defaults which can help improve
> system and network performance by reducing the number of hardware
> interrupts and improving GRO aggregation ratio.

Without this patch, seeing the following with an iperf3 server running 
at a gigabit link:

00:18:19     CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal 
  %guest   %idle
00:18:20     all    0.53    0.00    9.36    0.00    8.56   18.98    0.00 
    0.00   62.57

and with your patches applied:

00:00:56     CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal 
  %guest   %idle
00:00:57     all    0.00    0.00    3.29    0.00    1.01    7.34    0.00 
    0.00   88.35

so definitively helping, thanks!

Tested-by: Florian Fainelli <florian.fainelli@broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>

You will have to repost once net-next opens though:

https://patchwork.hopto.org/net-next.html

Thanks!
-- 
Florian

Re: [PATCH v1 0/2] net: bcmgenet: add support for GRO software interrupt coalescing

[Florian Fainelli]

On 6/2/25 12:00, Florian Fainelli wrote:
> Hi Zak,
> 
> On 5/31/25 15:48, Zak Kemble wrote:
>> Hey, these patches enable support for software IRQ coalescing and GRO
>> aggregation and applies conservative defaults which can help improve
>> system and network performance by reducing the number of hardware
>> interrupts and improving GRO aggregation ratio.
> 
> Without this patch, seeing the following with an iperf3 server running 
> at a gigabit link:
> 
> 00:18:19     CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal 
>   %guest   %idle
> 00:18:20     all    0.53    0.00    9.36    0.00    8.56   18.98    0.00 
>     0.00   62.57
> 
> and with your patches applied:
> 
> 00:00:56     CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal 
>   %guest   %idle
> 00:00:57     all    0.00    0.00    3.29    0.00    1.01    7.34    0.00 
>     0.00   88.35
> 
> so definitively helping, thanks!
> 
> Tested-by: Florian Fainelli <florian.fainelli@broadcom.com>
> Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
> 
> You will have to repost once net-next opens though:
> 
> https://patchwork.hopto.org/net-next.html
> 
> Thanks!

Zak, do you mind re-posting now that net-next is open? Thanks!
-- 
Florian

[PATCH v1 0/2] net: bcmgenet: add support for GRO software interrupt coalescing

[Zak Kemble]

Reposting as requested here https://lore.kernel.org/all/20250531224853.1339-1-zakkemble@gmail.com

Hey, these patches enable support for software IRQ coalescing and GRO
aggregation and applies conservative defaults which can help improve
system and network performance by reducing the number of hardware
interrupts and improving GRO aggregation ratio.

Zak Kemble (2):
  net: bcmgenet: use napi_complete_done return value
  net: bcmgenet: enable GRO software interrupt coalescing by default

 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

-- 
2.39.5

[PATCH v1 1/2] net: bcmgenet: use napi_complete_done return value

[Zak Kemble]

Make use of the return value from napi_complete_done(). This allows users to
use the gro_flush_timeout and napi_defer_hard_irqs sysfs attributes for
configuring software interrupt coalescing.

Signed-off-by: Zak Kemble <zakkemble@gmail.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index fa0077bc6..cc9bdd244 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -2472,10 +2472,8 @@ static int bcmgenet_rx_poll(struct napi_struct *napi, int budget)
 
 	work_done = bcmgenet_desc_rx(ring, budget);
 
-	if (work_done < budget) {
-		napi_complete_done(napi, work_done);
+	if (work_done < budget && napi_complete_done(napi, work_done))
 		bcmgenet_rx_ring_int_enable(ring);
-	}
 
 	if (ring->dim.use_dim) {
 		dim_update_sample(ring->dim.event_ctr, ring->dim.packets,
-- 
2.39.5