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Linux TC 限速原理与 mlx5 硬件卸载

  • 2026-07-01 14:44:54
Linux TC 限速原理与 mlx5 硬件卸载
Linux TC(Traffic Control)是内核的流量控制子系统,用于实现限速、整形、优先级调度和策略丢包。其架构以qdisc-class-filter三层树形结构组织,参考【1】。

令牌桶工作原理

令牌桶(Token Bucket)是 TC 限速的基础 :
令牌以固定速率注入桶(rate = 目标速率)每发送 1 字节消耗 1 个令牌。
桶的最大容量 = burst(允许的瞬时突发量)
时间片内:  报文到达 → 检查桶内令牌数  
≥ 报文字节数 → 消耗令牌,conform(放行) 
< 报文字节数 → 令牌不足,exceed(超限)→ drop/等待
rate 决定长期平均速率,burst 决定允许的短时突发大小。

egress 限速(SW Traffic Shaping)

Traffic Shaping

通过令牌桶(Token Bucket)控制出方向(egress)发送速率,多余流量缓冲在队列中等待,适合软限速。
报文到达 → 令牌桶有令牌 → 立即发送  → 令牌桶空  → 进队列等待令牌补充(不丢包)
特点:平滑突发、不丢包,但增加延迟,只能作用于egress(出方向)

完整配置步骤(SW egress HTB + flower 限速)

对 egress 限速需用 HTB(Hierarchical Token Bucket)

# 出方向根 qdisc(HTB)

tc qdisc add dev p0 root handle 1: htb default 10

# 限速 class:上限 10Gbps

tc class add dev p0 parent 1: classid 1:10 htb \

    rate 10gbit burst 100mb

# flower filter 将匹配流量引入该 class

tc filter add dev p0 parent 1: \

    protocol ip priority 100 \

    flower \

        src_ip 10.0.0.0/24 \

    flowid 1:10


Ingress 限速 tc police (mlx5)

Policing

通过令牌桶测量速率,超出部分直接 drop,不缓冲,适合入方向(ingress)强制限速 :
报文到达 → 令牌桶有令牌 → conform → ok(放行) → 令牌桶空    → exceed  → drop(丢弃)
特点:丢包,不增加延迟。
mlx5 支持将 tc police action卸载到 ConnectX eSwitch 硬件,实现zero-CPU 限速
传统软件 police 路径:  网卡 → 内核协议栈 → tc ingress hook → police action(CPU 执行)→ 放行/丢弃
mlx5 HW offload 路径:  网卡 eSwitch → 硬件 flow table 中的 meter 规则 → 放行/丢弃  (完全不经过 CPU,延迟 ~纳秒级)

完整配置步骤(mlx5 ingress 限速)

第一步:切换 switchdev 模式(HW offload 前提)

切换网卡到 switchdev(eSwitch)模式

devlink dev eswitch set pci/0000:03:00.0 mode switchdev

# 开启硬件 TC offload 能力

ethtool -K p0 hw-tc-offload on

ethtool -K pf0vf0 hw-tc-offload on     # VF representor 也要开

第二步:挂载 ingress qdisc

tc qdisc add dev p0 ingress handle ffff:

注:ffff: 是 ingress qdisc 的内核保留固定句柄,不可更改。

第三步:添加 flower filter + police action

# 对所有入方向 IP 流量限速 10Gbps

tc filter add dev p0 ingress     protocol ip     flower         skip_sw         dst_ip 10.0.0.0/24         ip_proto tcp     action police         rate 10gbit         burst 1mb         conform-exceed pipe/drop     action gact pass

第四步:验证是否 HW offload 成功

# 查看 filter,确认出现 in_hw 标志

tc -s -d filter show dev p0 ingress

# 示例输出:

filter protocol ip pref 49148 flower chain 0

filter protocol ip pref 49148 flower chain 0 handle 0x1

  eth_type ipv4

  ip_proto tcp

  dst_ip 10.0.0.0/24

  skip_sw

  in_hw in_hw_count 1

action order 1:  police 0x5 rate 10Gbit burst 1046250b mtu 2Kb action pipe/drop overhead 0b linklayer ethernet

ref 1 bind 1  installed 27 sec used 27 sec

Action statistics:

Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)

backlog 0b 0p requeues 0

used_hw_stats delayed

action order 2: gact action pass

random type none pass val 0

index 3 ref 1 bind 1 installed 27 sec used 27 sec

Action statistics:

Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)

backlog 0b 0p requeues 0

used_hw_stats delayed

# in_hw in_hw_count 1       ← 说明已卸载到硬件

# 查看 police action 统计(含硬件命中计数)

tc -s -d actions list action police

# 查看网卡硬件计数器

ethtool -S p0 | grep -i drop

# 删除 ingress qdisc(同时删除其下所有 filter)

tc qdisc del dev p0 ingress

常见场景速查

场景
方向
推荐方式
mlx5 HW offload
限制某 VF 入流量
ingress(VF rep)
tc police + flower
限制某 IP 入流量
ingress(物理口)
tc police + flower
出方向流量整形
egress
HTB + flower
✗(软件执行)
多租户 QoS 隔离
ingress per VF
tc police per VF rep
OVS OpenFlow Meter
ingress/egress
OVS meter → 自动映射 tc police
✓(CX-6 Dx+)

关键约束

  1. skip_sw 走HW卸载,只支持tc police;对egress HTB/TBF会报错。对于egress 硬件限速有强需求可以考虑vQoS:MLX5 限速原理详解:vQoS、Meter、PPS/BPS 限速
  2. mlx5 硬件要求 burst > 0。
  3. 内核版本 ≥ 5.12:tc police HW offload 的最低内核要求。
  4. 需 ConnectX-5 及以上:CX-4 不支持 tc police offload。
  5. mtu 建议显式设置:使用 jumbo frame(9000)时不设置会导致大包无法匹配。
参考:
  1. https://geek-blogs.com/blog/linux-tc-qdisc/

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  1. CONNECT:[ UseTime:0.000552s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000577s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002564s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000326s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000531s ]
  6. SELECT * FROM `set` [ RunTime:0.000317s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000638s ]
  8. SELECT * FROM `article` WHERE `id` = 496828 LIMIT 1 [ RunTime:0.027982s ]
  9. UPDATE `article` SET `lasttime` = 1783021766 WHERE `id` = 496828 [ RunTime:0.007124s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.011176s ]
  11. SELECT * FROM `article` WHERE `id` < 496828 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.008240s ]
  12. SELECT * FROM `article` WHERE `id` > 496828 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015497s ]
  13. SELECT * FROM `article` WHERE `id` < 496828 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.060065s ]
  14. SELECT * FROM `article` WHERE `id` < 496828 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000947s ]
  15. SELECT * FROM `article` WHERE `id` < 496828 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008673s ]
0.240616s