* [PATCH] net: stmmac: set multicast filter to zero if feature is unsupported
@ 2025-05-23 22:19 Nikunj Kela
2025-05-26 2:09 ` Yanteng Si
0 siblings, 1 reply; 4+ messages in thread
From: Nikunj Kela @ 2025-05-23 22:19 UTC (permalink / raw)
To: andrew+netdev, davem, edumazet, kuba, pabeni, mcoquelin.stm32,
alexandre.torgue
Cc: rmk+kernel, 0x1207, netdev, linux-stm32, linux-arm-kernel,
linux-kernel, Nikunj Kela
Hash based multicast filtering is an optional feature. Currently,
driver overrides the value of multicast_filter_bins based on the hash
table size. If the feature is not supported, hash table size reads 0
however the value of multicast_filter_bins remains set to default
HASH_TABLE_SIZE which is incorrect. Let's override it to 0 if the
feature is unsupported.
Signed-off-by: Nikunj Kela <nikunj.kela@sima.ai>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 085c09039af4..ccea9f811a05 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -7241,6 +7241,9 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
(BIT(priv->dma_cap.hash_tb_sz) << 5);
priv->hw->mcast_bits_log2 =
ilog2(priv->hw->multicast_filter_bins);
+ } else {
+ priv->hw->multicast_filter_bins = 0;
+ priv->hw->mcast_bits_log2 = 0;
}
/* TXCOE doesn't work in thresh DMA mode */
--
2.34.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] net: stmmac: set multicast filter to zero if feature is unsupported
2025-05-23 22:19 [PATCH] net: stmmac: set multicast filter to zero if feature is unsupported Nikunj Kela
@ 2025-05-26 2:09 ` Yanteng Si
2025-05-26 16:17 ` Nikunj Kela
0 siblings, 1 reply; 4+ messages in thread
From: Yanteng Si @ 2025-05-26 2:09 UTC (permalink / raw)
To: Nikunj Kela, andrew+netdev, davem, edumazet, kuba, pabeni,
mcoquelin.stm32, alexandre.torgue
Cc: rmk+kernel, 0x1207, netdev, linux-stm32, linux-arm-kernel,
linux-kernel
在 5/24/25 6:19 AM, Nikunj Kela 写道:
> Hash based multicast filtering is an optional feature. Currently,
> driver overrides the value of multicast_filter_bins based on the hash
> table size. If the feature is not supported, hash table size reads 0
> however the value of multicast_filter_bins remains set to default
> HASH_TABLE_SIZE which is incorrect. Let's override it to 0 if the
> feature is unsupported.
>
> Signed-off-by: Nikunj Kela <nikunj.kela@sima.ai>
> ---
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 085c09039af4..ccea9f811a05 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -7241,6 +7241,9 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
> (BIT(priv->dma_cap.hash_tb_sz) << 5);
> priv->hw->mcast_bits_log2 =
> ilog2(priv->hw->multicast_filter_bins);
> + } else {
> + priv->hw->multicast_filter_bins = 0;
> + priv->hw->mcast_bits_log2 = 0;
> }
I didn't read the code carefully, just did a simple search：
❯ grep -rn multicast_filter_bins drivers/net/
drivers/net/ethernet/stmicro/stmmac/common.h:611: unsigned int
multicast_filter_bins;
drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c:26:
plat_dat->multicast_filter_bins = 0;
***
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:512:
plat->multicast_filter_bins = HASH_TABLE_SIZE;
***
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:536:
&plat->multicast_filter_bins);
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:541:
plat->multicast_filter_bins = dwmac1000_validate_mcast_bins(
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:542:
&pdev->dev, plat->multicast_filter_bins);
drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c:523:
mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c:527: if
(mac->multicast_filter_bins)
drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c:528:
mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:516:
(netdev_mc_count(dev) > hw->multicast_filter_bins)) {
drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1527:
mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1531: if
(mac->multicast_filter_bins)
drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1532:
mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1568:
mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1572: if
(mac->multicast_filter_bins)
drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1573:
mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:543: if
(netdev_mc_count(priv->dev) >= priv->hw->multicast_filter_bins)
drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:633: if
(netdev_mc_count(priv->dev) >= priv->hw->multicast_filter_bins)
drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:679: if
(netdev_mc_count(priv->dev) >= priv->hw->multicast_filter_bins)
drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c:31:
plat->multicast_filter_bins = HASH_TABLE_SIZE;
drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c:84:
plat->multicast_filter_bins = HASH_TABLE_SIZE;
drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:98:
plat->multicast_filter_bins = 256;
drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:365:
mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:369: if
(mac->multicast_filter_bins)
drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:370:
mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:7240:
priv->hw->multicast_filter_bins =
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:7243:
ilog2(priv->hw->multicast_filter_bins);
drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c:570:
plat->multicast_filter_bins = HASH_TABLE_SIZE;
drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c:707:
plat->multicast_filter_bins = HASH_TABLE_SIZE;
drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c:479:
plat_dat->multicast_filter_bins = 0;
drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:456: int numhashregs =
(hw->multicast_filter_bins >> 5);
drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:485:
(netdev_mc_count(dev) > hw->multicast_filter_bins)) {
drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:1057:
mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:1061: if
(mac->multicast_filter_bins)
drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:1062:
mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
drivers/net/ethernet/stmicro/stmmac/dwmac-generic.c:43:
plat_dat->multicast_filter_bins = HASH_TABLE_SIZE;
and
drivers/net/ethernet/stmicro/stmmac/common.h:265:#define HASH_TABLE_SIZE 64
From the search results, the default value of multicast_filter_bins
may be meaningful. And I think that even if some hardware does not
support this feature, it should still be overridden in its own directory.
Thanks,
Yanteng
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] net: stmmac: set multicast filter to zero if feature is unsupported
2025-05-26 2:09 ` Yanteng Si
@ 2025-05-26 16:17 ` Nikunj Kela
2025-05-27 9:46 ` Yanteng Si
0 siblings, 1 reply; 4+ messages in thread
From: Nikunj Kela @ 2025-05-26 16:17 UTC (permalink / raw)
To: Yanteng Si, andrew+netdev, davem, edumazet, kuba, pabeni,
mcoquelin.stm32, alexandre.torgue
Cc: rmk+kernel, 0x1207, netdev, linux-stm32, linux-arm-kernel,
linux-kernel
On 5/25/25 7:09 PM, Yanteng Si wrote:
> 在 5/24/25 6:19 AM, Nikunj Kela 写道:
>> Hash based multicast filtering is an optional feature. Currently,
>> driver overrides the value of multicast_filter_bins based on the hash
>> table size. If the feature is not supported, hash table size reads 0
>> however the value of multicast_filter_bins remains set to default
>> HASH_TABLE_SIZE which is incorrect. Let's override it to 0 if the
>> feature is unsupported.
>>
>> Signed-off-by: Nikunj Kela <nikunj.kela@sima.ai>
>> ---
>> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +++
>> 1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> index 085c09039af4..ccea9f811a05 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>> @@ -7241,6 +7241,9 @@ static int stmmac_hw_init(struct stmmac_priv
>> *priv)
>> (BIT(priv->dma_cap.hash_tb_sz) << 5);
>> priv->hw->mcast_bits_log2 =
>> ilog2(priv->hw->multicast_filter_bins);
>> + } else {
>> + priv->hw->multicast_filter_bins = 0;
>> + priv->hw->mcast_bits_log2 = 0;
>> }
>
> I didn't read the code carefully, just did a simple search：
>
> ❯ grep -rn multicast_filter_bins drivers/net/
> drivers/net/ethernet/stmicro/stmmac/common.h:611: unsigned int
> multicast_filter_bins;
> drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c:26:
> plat_dat->multicast_filter_bins = 0;
> ***
> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:512:
> plat->multicast_filter_bins = HASH_TABLE_SIZE;
> ***
> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:536:
> &plat->multicast_filter_bins);
> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:541:
> plat->multicast_filter_bins = dwmac1000_validate_mcast_bins(
> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:542: &pdev->dev,
> plat->multicast_filter_bins);
> drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c:523:
> mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
> drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c:527: if
> (mac->multicast_filter_bins)
> drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c:528:
> mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:516:
> (netdev_mc_count(dev) > hw->multicast_filter_bins)) {
> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1527:
> mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1531: if
> (mac->multicast_filter_bins)
> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1532:
> mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1568:
> mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1572: if
> (mac->multicast_filter_bins)
> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1573:
> mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
> drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:543: if
> (netdev_mc_count(priv->dev) >= priv->hw->multicast_filter_bins)
> drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:633: if
> (netdev_mc_count(priv->dev) >= priv->hw->multicast_filter_bins)
> drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:679: if
> (netdev_mc_count(priv->dev) >= priv->hw->multicast_filter_bins)
> drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c:31:
> plat->multicast_filter_bins = HASH_TABLE_SIZE;
> drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c:84:
> plat->multicast_filter_bins = HASH_TABLE_SIZE;
> drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:98:
> plat->multicast_filter_bins = 256;
> drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:365:
> mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
> drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:369: if
> (mac->multicast_filter_bins)
> drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:370:
> mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:7240:
> priv->hw->multicast_filter_bins =
> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:7243:
> ilog2(priv->hw->multicast_filter_bins);
> drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c:570:
> plat->multicast_filter_bins = HASH_TABLE_SIZE;
> drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c:707:
> plat->multicast_filter_bins = HASH_TABLE_SIZE;
> drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c:479:
> plat_dat->multicast_filter_bins = 0;
> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:456: int
> numhashregs = (hw->multicast_filter_bins >> 5);
> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:485:
> (netdev_mc_count(dev) > hw->multicast_filter_bins)) {
> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:1057:
> mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:1061: if
> (mac->multicast_filter_bins)
> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:1062:
> mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
> drivers/net/ethernet/stmicro/stmmac/dwmac-generic.c:43:
> plat_dat->multicast_filter_bins = HASH_TABLE_SIZE;
>
> and
>
> drivers/net/ethernet/stmicro/stmmac/common.h:265:#define
> HASH_TABLE_SIZE 64
>
>
> From the search results, the default value of multicast_filter_bins
> may be meaningful. And I think that even if some hardware does not
> support this feature, it should still be overridden in its own directory.
There is a DT property 'snps,multicast-filter-bins' available to
override the default value for a platform however this property is not
taken into consideration in case of xgmac. That being said,
stmmac_platform.c logic can be modified to extend the property use for
xgmac also however the value will be overridden later based on hash
table size read from the HW Feature register. So only zero value will be
usable via DT in that case. Hence I thought of setting it to 0 in the
else part of the code I modified in this patch. If you think I should
extend the DT property for xgmac, I can modify the patch too.
Thanks,
-Nikunj
>
>
> Thanks,
> Yanteng
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] net: stmmac: set multicast filter to zero if feature is unsupported
2025-05-26 16:17 ` Nikunj Kela
@ 2025-05-27 9:46 ` Yanteng Si
0 siblings, 0 replies; 4+ messages in thread
From: Yanteng Si @ 2025-05-27 9:46 UTC (permalink / raw)
To: Nikunj Kela, andrew+netdev, davem, edumazet, kuba, pabeni,
mcoquelin.stm32, alexandre.torgue
Cc: rmk+kernel, 0x1207, netdev, linux-stm32, linux-arm-kernel,
linux-kernel
在 5/27/25 12:17 AM, Nikunj Kela 写道:
>
> On 5/25/25 7:09 PM, Yanteng Si wrote:
>> 在 5/24/25 6:19 AM, Nikunj Kela 写道:
>>> Hash based multicast filtering is an optional feature. Currently,
>>> driver overrides the value of multicast_filter_bins based on the hash
>>> table size. If the feature is not supported, hash table size reads 0
>>> however the value of multicast_filter_bins remains set to default
>>> HASH_TABLE_SIZE which is incorrect. Let's override it to 0 if the
>>> feature is unsupported.
>>>
>>> Signed-off-by: Nikunj Kela <nikunj.kela@sima.ai>
>>> ---
>>> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +++
>>> 1 file changed, 3 insertions(+)
>>>
>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>>> b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>>> index 085c09039af4..ccea9f811a05 100644
>>> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>>> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
>>> @@ -7241,6 +7241,9 @@ static int stmmac_hw_init(struct stmmac_priv
>>> *priv)
>>> (BIT(priv->dma_cap.hash_tb_sz) << 5);
>>> priv->hw->mcast_bits_log2 =
>>> ilog2(priv->hw->multicast_filter_bins);
>>> + } else {
>>> + priv->hw->multicast_filter_bins = 0;
>>> + priv->hw->mcast_bits_log2 = 0;
>>> }
>>
>> I didn't read the code carefully, just did a simple search：
>>
>> ❯ grep -rn multicast_filter_bins drivers/net/
>> drivers/net/ethernet/stmicro/stmmac/common.h:611: unsigned int
>> multicast_filter_bins;
>> drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c:26:
>> plat_dat->multicast_filter_bins = 0;
>> ***
>> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:512:
>> plat->multicast_filter_bins = HASH_TABLE_SIZE;
>> ***
>> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:536:
>> &plat->multicast_filter_bins);
>> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:541:
>> plat->multicast_filter_bins = dwmac1000_validate_mcast_bins(
>> drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c:542:
>> &pdev->dev, plat->multicast_filter_bins);
>> drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c:523:
>> mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
>> drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c:527: if
>> (mac->multicast_filter_bins)
>> drivers/net/ethernet/stmicro/stmmac/dwmac1000_core.c:528:
>> mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
>> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:516:
>> (netdev_mc_count(dev) > hw->multicast_filter_bins)) {
>> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1527:
>> mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
>> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1531: if
>> (mac->multicast_filter_bins)
>> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1532:
>> mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
>> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1568:
>> mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
>> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1572: if
>> (mac->multicast_filter_bins)
>> drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c:1573:
>> mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
>> drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:543: if
>> (netdev_mc_count(priv->dev) >= priv->hw->multicast_filter_bins)
>> drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:633: if
>> (netdev_mc_count(priv->dev) >= priv->hw->multicast_filter_bins)
>> drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c:679: if
>> (netdev_mc_count(priv->dev) >= priv->hw->multicast_filter_bins)
>> drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c:31:
>> plat->multicast_filter_bins = HASH_TABLE_SIZE;
>> drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c:84:
>> plat->multicast_filter_bins = HASH_TABLE_SIZE;
>> drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:98:
>> plat->multicast_filter_bins = 256;
>> drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:365:
>> mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
>> drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:369: if
>> (mac->multicast_filter_bins)
>> drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c:370:
>> mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
>> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:7240:
>> priv->hw->multicast_filter_bins =
>> drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:7243:
>> ilog2(priv->hw->multicast_filter_bins);
>> drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c:570:
>> plat->multicast_filter_bins = HASH_TABLE_SIZE;
>> drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c:707:
>> plat->multicast_filter_bins = HASH_TABLE_SIZE;
>> drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c:479:
>> plat_dat->multicast_filter_bins = 0;
>> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:456: int
>> numhashregs = (hw->multicast_filter_bins >> 5);
>> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:485:
>> (netdev_mc_count(dev) > hw->multicast_filter_bins)) {
>> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:1057:
>> mac->multicast_filter_bins = priv->plat->multicast_filter_bins;
>> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:1061: if
>> (mac->multicast_filter_bins)
>> drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c:1062:
>> mac->mcast_bits_log2 = ilog2(mac->multicast_filter_bins);
>> drivers/net/ethernet/stmicro/stmmac/dwmac-generic.c:43:
>> plat_dat->multicast_filter_bins = HASH_TABLE_SIZE;
>>
>> and
>>
>> drivers/net/ethernet/stmicro/stmmac/common.h:265:#define
>> HASH_TABLE_SIZE 64
>>
>>
>> From the search results, the default value of multicast_filter_bins
>> may be meaningful. And I think that even if some hardware does not
>> support this feature, it should still be overridden in its own
>> directory.
>
> There is a DT property 'snps,multicast-filter-bins' available to
> override the default value for a platform however this property is not
> taken into consideration in case of xgmac. That being said,
> stmmac_platform.c logic can be modified to extend the property use for
> xgmac also however the value will be overridden later based on hash
> table size read from the HW Feature register. So only zero value will
> be usable via DT in that case. Hence I thought of setting it to 0 in
> the else part of the code I
> modified in this patch. If you think I should extend the DT property
> for xgmac, I can modify the patch too.
Thanks for your reply. I think this is better.
Thanks,
Yanteng
>
> Thanks,
>
> -Nikunj
>
>>
>>
>> Thanks,
>> Yanteng
>>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2025-05-27 9:49 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-05-23 22:19 [PATCH] net: stmmac: set multicast filter to zero if feature is unsupported Nikunj Kela
2025-05-26 2:09 ` Yanteng Si
2025-05-26 16:17 ` Nikunj Kela
2025-05-27 9:46 ` Yanteng Si
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