drivers/net/ethernet/realtek/r8169_main.c | 1202 ++++++++++++++++++--- 1 file changed, 1080 insertions(+), 122 deletions(-)
From: Javen Xu <javen_xu@realsil.com.cn> This patch series adds RSS (Receive Side Scaling) support for the r8169 ethernet driver, specifically for RTL8127 (RTL_GIGA_MAC_VER_80). RSS enables packet distribution across multiple receive queues, which can significantly improve network throughput on multi-core systems by allowing parallel processing of incoming packets. Key features: - Multi-queue RX support (up to 8 queues) - MSI-X interrupt with vector mapping - Dynamic queue configuration via ethtool (-L) - RSS hash computation for flow classification Experiments: Platform: AMD Ryzen Embedded R2514 with Radeon Graphics(4 Cores/8 Threads) Arch: x86_64 Test command: Server: iperf3 -s Client: iperf3 -c 192.168.2.1 -P 20 -t 3600 Monitor: mpstat -P ALL 1 Before this patch (Without RSS): Throughput: Unstable, fluctuating between 3.76 Gbits/sec and 8.2 Gbits/sec. CPU Usage: A single CPU core is fully occupied with softirq reaching up to 96%. After this patch (With RSS enabled): Throughput: Stable at 9.42 Gbits/sec. CPU Usage: The traffic load is evenly distributed across multiple CPU cores. The maximum softirq on a single core dropped to 63%. Other Experiments: Link: https://lore.kernel.org/netdev/0A5279953D81BB9C+f50c9b49-3e5d-467f-b69a-7e49ed223383@radxa.com/ Javen Xu (7): r8169: add support for multi irqs r8169: add support for multi rx queues r8169: add support for new interrupt mapping r8169: enable new interrupt mapping r8169: add support and enable rss r8169: move struct ethtool_ops r8169: add support for ethtool drivers/net/ethernet/realtek/r8169_main.c | 1202 ++++++++++++++++++--- 1 file changed, 1080 insertions(+), 122 deletions(-) -- 2.43.0
On 06.05.2026 10:13, javen wrote: > From: Javen Xu <javen_xu@realsil.com.cn> > > This patch series adds RSS (Receive Side Scaling) support for the r8169 > ethernet driver, specifically for RTL8127 (RTL_GIGA_MAC_VER_80). Series adds RSS support for RTL8127 only. Is this generic enough to retrofit RSS support for other chip versions like RTL8126 w/o bigger refactoring? > > RSS enables packet distribution across multiple receive queues, which can > significantly improve network throughput on multi-core systems by allowing > parallel processing of incoming packets. > > Key features: > - Multi-queue RX support (up to 8 queues) > - MSI-X interrupt with vector mapping > - Dynamic queue configuration via ethtool (-L) > - RSS hash computation for flow classification > > Experiments: > Platform: AMD Ryzen Embedded R2514 with Radeon Graphics(4 Cores/8 Threads) > Arch: x86_64 > Test command: > Server: iperf3 -s > Client: iperf3 -c 192.168.2.1 -P 20 -t 3600 > Monitor: mpstat -P ALL 1 > > Before this patch (Without RSS): > Throughput: Unstable, fluctuating between 3.76 Gbits/sec and > 8.2 Gbits/sec. > CPU Usage: A single CPU core is fully occupied with softirq reaching > up to 96%. > > After this patch (With RSS enabled): > Throughput: Stable at 9.42 Gbits/sec. > CPU Usage: The traffic load is evenly distributed across multiple CPU > cores. The maximum softirq on a single core dropped to 63%. > > Other Experiments: > Link: https://lore.kernel.org/netdev/0A5279953D81BB9C+f50c9b49-3e5d-467f-b69a-7e49ed223383@radxa.com/ > > Javen Xu (7): > r8169: add support for multi irqs > r8169: add support for multi rx queues > r8169: add support for new interrupt mapping > r8169: enable new interrupt mapping > r8169: add support and enable rss > r8169: move struct ethtool_ops > r8169: add support for ethtool > > drivers/net/ethernet/realtek/r8169_main.c | 1202 ++++++++++++++++++--- > 1 file changed, 1080 insertions(+), 122 deletions(-) >
>On 06.05.2026 10:13, javen wrote:
>> From: Javen Xu <javen_xu@realsil.com.cn>
>>
>> This patch series adds RSS (Receive Side Scaling) support for the
>> r8169 ethernet driver, specifically for RTL8127 (RTL_GIGA_MAC_VER_80).
>
>Series adds RSS support for RTL8127 only. Is this generic enough to retrofit RSS
>support for other chip versions like RTL8126 w/o bigger refactoring?
>
Yes. The current implementation is generic enough. Almost all the registers are shared and can be reused. If we want to enable rss for 8125/8126 later, the only necessary change would be setting tp->init_rx_desc_type to a new value. And add a new struct rx_desc for 8125 or 8126. For example, this is a desc type for 8125.
struct RxDescV3 {
union {
struct {
u32 rsv1;
u32 rsv2;
} RxDescDDWord1;
};
union {
struct {
u32 RSSResult;
u16 HeaderBufferLen;
u16 HeaderInfo;
} RxDescNormalDDWord2;
struct {
u32 rsv5;
u32 rsv6;
} RxDescDDWord2;
};
union {
u64 addr;
struct {
u32 TimeStampLow;
u32 TimeStampHigh;
} RxDescTimeStamp;
struct {
u32 rsv8;
u32 rsv9;
} RxDescDDWord3;
};
union {
struct {
u32 opts2;
u32 opts1;
} RxDescNormalDDWord4;
struct {
u16 TimeStampHHigh;
u16 rsv11;
u32 opts1;
} RxDescPTPDDWord4;
};
};
This is complex because it reserves some words for PTP.
Thanks,
BRs,
Javen
>>
>> RSS enables packet distribution across multiple receive queues, which
>> can significantly improve network throughput on multi-core systems by
>> allowing parallel processing of incoming packets.
>>
>> Key features:
>> - Multi-queue RX support (up to 8 queues)
>> - MSI-X interrupt with vector mapping
>> - Dynamic queue configuration via ethtool (-L)
>> - RSS hash computation for flow classification
>>
>> Experiments:
>> Platform: AMD Ryzen Embedded R2514 with Radeon Graphics(4 Cores/8
>> Threads)
>> Arch: x86_64
>> Test command:
>> Server: iperf3 -s
>> Client: iperf3 -c 192.168.2.1 -P 20 -t 3600
>> Monitor: mpstat -P ALL 1
>>
>> Before this patch (Without RSS):
>> Throughput: Unstable, fluctuating between 3.76 Gbits/sec and
>> 8.2 Gbits/sec.
>> CPU Usage: A single CPU core is fully occupied with softirq reaching
>> up to 96%.
>>
>> After this patch (With RSS enabled):
>> Throughput: Stable at 9.42 Gbits/sec.
>> CPU Usage: The traffic load is evenly distributed across multiple CPU
>> cores. The maximum softirq on a single core dropped to 63%.
>>
>> Other Experiments:
>> Link:
>> https://lore.kernel.org/netdev/0A5279953D81BB9C+f50c9b49-3e5d-467f-
>b69
>> a-7e49ed223383@radxa.com/
>>
>> Javen Xu (7):
>> r8169: add support for multi irqs
>> r8169: add support for multi rx queues
>> r8169: add support for new interrupt mapping
>> r8169: enable new interrupt mapping
>> r8169: add support and enable rss
>> r8169: move struct ethtool_ops
>> r8169: add support for ethtool
>>
>> drivers/net/ethernet/realtek/r8169_main.c | 1202
>> ++++++++++++++++++---
>> 1 file changed, 1080 insertions(+), 122 deletions(-)
>>
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