德州仪器 CPSW 以太网驱动¶
多队列 & CBS & MQPRIO¶
CPSW 为每个外部端口提供 3 个 CBS 整形器。本文档通过示例描述了 CPSW 驱动程序的 MQPRIO 和 CBS Qdisc 卸载配置。它可能用于音频视频桥接 (AVB) 和时间敏感网络 (TSN)。
以下示例已在 AM572x EVM 和 BBB 板上进行测试。
测试设置¶
考虑到两个示例，其中 AM572x EVM 在 dual_emac 模式下运行 CPSW 驱动程序。
几个先决条件
TX 队列必须从具有最高优先级的 txq0 开始评级
流量类别从 0 开始使用，其中 0 具有最高优先级
CBS 整形器应与评级队列一起使用
CBS 整形器的带宽必须设置得略高于潜在的入站速率，因此，所有入站 TX 队列的速率必须略低一些
实际速率可能因离散性而异
将 skb 优先级映射到 txq 是不够的，还需要使用 ip 或 vconfig 工具创建 skb 优先级到 l2 优先级的映射
类可以使用任何 l2/socket 优先级 (0 - 7)，但为简单起见，使用默认值：3 和 2
只测试了 2 个类别：A 和 B，但已检查并可与更多类别一起使用，最大允许 4 个，但只有 3 个可以设置速率。
示例测试设置¶
+-------------------------------+
|--+ |
| | Workstation0 |
|E | MAC 18:03:73:66:87:42 |
+-----------------------------+ +--|t | |
| | 1 | E | | |h |./tsn_listener -d \ |
| Target board: | 0 | t |--+ |0 | 18:03:73:66:87:42 -i eth0 \|
| AM572x EVM | 0 | h | | | -s 1500 |
| | 0 | 0 | |--+ |
| Only 2 classes: |Mb +---| +-------------------------------+
| class A, class B | |
| | +---| +-------------------------------+
| | 1 | E | |--+ |
| | 0 | t | | | Workstation1 |
| | 0 | h |--+ |E | MAC 20:cf:30:85:7d:fd |
| |Mb | 1 | +--|t | |
+-----------------------------+ |h |./tsn_listener -d \ |
|0 | 20:cf:30:85:7d:fd -i eth0 \|
| | -s 1500 |
|--+ |
+-------------------------------+
示例 1：目标板的单端口 TX AVB 配置方案¶
(AM572x EVM 的输出和方案，适用于单端口板)
tc - 流量类别
txq - 发送队列
p - 优先级
f - FIFO (CPSW FIFO)
S - 已配置整形器
+------------------------------------------------------------------+ u
| +---------------+ +---------------+ +------+ +------+ | s
| | | | | | | | | | e
| | App 1 | | App 2 | | Apps | | Apps | | r
| | Class A | | Class B | | Rest | | Rest | |
| | Eth0 | | Eth0 | | Eth0 | | Eth1 | | s
| | VLAN100 | | VLAN100 | | | | | | | | p
| | 40 Mb/s | | 20 Mb/s | | | | | | | | a
| | SO_PRIORITY=3 | | SO_PRIORITY=2 | | | | | | | | c
| | | | | | | | | | | | | | e
| +---|-----------+ +---|-----------+ +---|--+ +---|--+ |
+-----|------------------|------------------|--------|-------------+
+-+ +------------+ | |
| | +-----------------+ +--+
| | | |
+---|-------|-------------|-----------------------|----------------+
| +----+ +----+ +----+ +----+ +----+ |
| | p3 | | p2 | | p1 | | p0 | | p0 | | k
| \ / \ / \ / \ / \ / | e
| \ / \ / \ / \ / \ / | r
| \/ \/ \/ \/ \/ | n
| | | | | | e
| | | +-----+ | | l
| | | | | |
| +----+ +----+ +----+ +----+ | s
| |tc0 | |tc1 | |tc2 | |tc0 | | p
| \ / \ / \ / \ / | a
| \ / \ / \ / \ / | c
| \/ \/ \/ \/ | e
| | | +-----+ | |
| | | | | | |
| | | | | | |
| | | | | | |
| +----+ +----+ +----+ +----+ +----+ |
| |txq0| |txq1| |txq2| |txq3| |txq4| |
| \ / \ / \ / \ / \ / |
| \ / \ / \ / \ / \ / |
| \/ \/ \/ \/ \/ |
| +-|------|------|------|--+ +--|--------------+ |
| | | | | | | Eth0.100 | | Eth1 | |
+---|------|------|------|------------------------|----------------+
| | | | |
p p p p |
3 2 0-1, 4-7 <- L2 priority |
| | | | |
| | | | |
+---|------|------|------|------------------------|----------------+
| | | | | |----------+ |
| +----+ +----+ +----+ +----+ +----+ |
| |dma7| |dma6| |dma5| |dma4| |dma3| |
| \ / \ / \ / \ / \ / | c
| \S / \S / \ / \ / \ / | p
| \/ \/ \/ \/ \/ | s
| | | | +----- | | w
| | | | | | |
| | | | | | | d
| +----+ +----+ +----+p p+----+ | r
| | | | | | |o o| | | i
| | f3 | | f2 | | f0 |r r| f0 | | v
| |tc0 | |tc1 | |tc2 |t t|tc0 | | e
| \CBS / \CBS / \CBS /1 2\CBS / | r
| \S / \S / \ / \ / |
| \/ \/ \/ \/ |
+------------------------------------------------------------------+
// Add 4 tx queues, for interface Eth0, and 1 tx queue for Eth1 $ ethtool -L eth0 rx 1 tx 5 rx unmodified, ignoring
// Check if num of queues is set correctly: $ ethtool -l eth0 Channel parameters for eth0: Pre-set maximums: RX: 8 TX: 8 Other: 0 Combined: 0 Current hardware settings: RX: 1 TX: 5 Other: 0 Combined: 0
// TX queues must be rated starting from 0, so set bws for tx0 and tx1 // Set rates 40 and 20 Mb/s appropriately. // Pay attention, real speed can differ a bit due to discreetness. // Leave last 2 tx queues not rated. $ echo 40 > /sys/class/net/eth0/queues/tx-0/tx_maxrate $ echo 20 > /sys/class/net/eth0/queues/tx-1/tx_maxrate
// Check maximum rate of tx (cpdma) queues: $ cat /sys/class/net/eth0/queues/tx-*/tx_maxrate 40 20 0 0 0
// Map skb->priority to traffic class: // 3pri -> tc0, 2pri -> tc1, (0,1,4-7)pri -> tc2 // Map traffic class to transmit queue: // tc0 -> txq0, tc1 -> txq1, tc2 -> (txq2, txq3) $ tc qdisc replace dev eth0 handle 100: parent root mqprio num_tc 3 \ map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 queues 1@0 1@1 2@2 hw 1
5a)
// As two interface sharing same set of tx queues, assign all traffic
// coming to interface Eth1 to separate queue in order to not mix it
// with traffic from interface Eth0, so use separate txq to send
// packets to Eth1, so all prio -> tc0 and tc0 -> txq4
// Here hw 0, so here still default configuration for eth1 in hw
$ tc qdisc replace dev eth1 handle 100: parent root mqprio num_tc 1 \
map 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 queues 1@4 hw 0
// Check classes settings $ tc -g class show dev eth0 +---(100:ffe2) mqprio | +---(100:3) mqprio | +---(100:4) mqprio | +---(100:ffe1) mqprio | +---(100:2) mqprio | +---(100:ffe0) mqprio +---(100:1) mqprio $ tc -g class show dev eth1 +---(100:ffe0) mqprio +---(100:5) mqprio// Set rate for class A - 41 Mbit (tc0, txq0) using CBS Qdisc // Set it +1 Mb for reserve (important!) // here only idle slope is important, others arg are ignored // Pay attention, real speed can differ a bit due to discreetness $ tc qdisc add dev eth0 parent 100:1 cbs locredit -1438 \ hicredit 62 sendslope -959000 idleslope 41000 offload 1 net eth0: set FIFO3 bw = 50
// Set rate for class B - 21 Mbit (tc1, txq1) using CBS Qdisc: // Set it +1 Mb for reserve (important!) $ tc qdisc add dev eth0 parent 100:2 cbs locredit -1468 \ hicredit 65 sendslope -979000 idleslope 21000 offload 1 net eth0: set FIFO2 bw = 30
// Create vlan 100 to map sk->priority to vlan qos $ ip link add link eth0 name eth0.100 type vlan id 100 8021q: 802.1Q VLAN Support v1.8 8021q: adding VLAN 0 to HW filter on device eth0 8021q: adding VLAN 0 to HW filter on device eth1 net eth0: Adding vlanid 100 to vlan filter
// Map skb->priority to L2 prio, 1 to 1 $ ip link set eth0.100 type vlan \ egress 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
// Check egress map for vlan 100 $ cat /proc/net/vlan/eth0.100 [...] INGRESS priority mappings: 0:0 1:0 2:0 3:0 4:0 5:0 6:0 7:0 EGRESS priority mappings: 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
// Run your appropriate tools with socket option "SO_PRIORITY" // to 3 for class A and/or to 2 for class B // (I took at https://www.spinics.net/lists/netdev/msg460869.html) ./tsn_talker -d 18:03:73:66:87:42 -i eth0.100 -p3 -s 1500& ./tsn_talker -d 18:03:73:66:87:42 -i eth0.100 -p2 -s 1500&
// run your listener on workstation (should be in same vlan) // (I took at https://www.spinics.net/lists/netdev/msg460869.html) ./tsn_listener -d 18:03:73:66:87:42 -i enp5s0 -s 1500 Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39000 kbps
// Restore default configuration if needed $ ip link del eth0.100 $ tc qdisc del dev eth1 root $ tc qdisc del dev eth0 root net eth0: Prev FIFO2 is shaped net eth0: set FIFO3 bw = 0 net eth0: set FIFO2 bw = 0 $ ethtool -L eth0 rx 1 tx 1
示例 2：目标板的双端口 TX AVB 配置方案¶
(AM572x EVM 的输出和方案，仅适用于双 EMAC 板)
+------------------------------------------------------------------+ u
| +----------+ +----------+ +------+ +----------+ +----------+ | s
| | | | | | | | | | | | e
| | App 1 | | App 2 | | Apps | | App 3 | | App 4 | | r
| | Class A | | Class B | | Rest | | Class B | | Class A | |
| | Eth0 | | Eth0 | | | | | Eth1 | | Eth1 | | s
| | VLAN100 | | VLAN100 | | | | | VLAN100 | | VLAN100 | | p
| | 40 Mb/s | | 20 Mb/s | | | | | 10 Mb/s | | 30 Mb/s | | a
| | SO_PRI=3 | | SO_PRI=2 | | | | | SO_PRI=3 | | SO_PRI=2 | | c
| | | | | | | | | | | | | | | | | e
| +---|------+ +---|------+ +---|--+ +---|------+ +---|------+ |
+-----|-------------|-------------|---------|-------------|--------+
+-+ +-------+ | +----------+ +----+
| | +-------+------+ | |
| | | | | |
+---|-------|-------------|--------------|-------------|-------|---+
| +----+ +----+ +----+ +----+ +----+ +----+ +----+ +----+ |
| | p3 | | p2 | | p1 | | p0 | | p0 | | p1 | | p2 | | p3 | | k
| \ / \ / \ / \ / \ / \ / \ / \ / | e
| \ / \ / \ / \ / \ / \ / \ / \ / | r
| \/ \/ \/ \/ \/ \/ \/ \/ | n
| | | | | | | | e
| | | +----+ +----+ | | | l
| | | | | | | |
| +----+ +----+ +----+ +----+ +----+ +----+ | s
| |tc0 | |tc1 | |tc2 | |tc2 | |tc1 | |tc0 | | p
| \ / \ / \ / \ / \ / \ / | a
| \ / \ / \ / \ / \ / \ / | c
| \/ \/ \/ \/ \/ \/ | e
| | | +-----+ +-----+ | | |
| | | | | | | | | |
| | | | | | | | | |
| | | | | E E | | | | |
| +----+ +----+ +----+ +----+ t t +----+ +----+ +----+ +----+ |
| |txq0| |txq1| |txq4| |txq5| h h |txq6| |txq7| |txq3| |txq2| |
| \ / \ / \ / \ / 0 1 \ / \ / \ / \ / |
| \ / \ / \ / \ / . . \ / \ / \ / \ / |
| \/ \/ \/ \/ 1 1 \/ \/ \/ \/ |
| +-|------|------|------|--+ 0 0 +-|------|------|------|--+ |
| | | | | | | 0 0 | | | | | | |
+---|------|------|------|---------------|------|------|------|----+
| | | | | | | |
p p p p p p p p
3 2 0-1, 4-7 <-L2 pri-> 0-1, 4-7 2 3
| | | | | | | |
| | | | | | | |
+---|------|------|------|---------------|------|------|------|----+
| | | | | | | | | |
| +----+ +----+ +----+ +----+ +----+ +----+ +----+ +----+ |
| |dma7| |dma6| |dma3| |dma2| |dma1| |dma0| |dma4| |dma5| |
| \ / \ / \ / \ / \ / \ / \ / \ / | c
| \S / \S / \ / \ / \ / \ / \S / \S / | p
| \/ \/ \/ \/ \/ \/ \/ \/ | s
| | | | +----- | | | | | w
| | | | | +----+ | | | |
| | | | | | | | | | d
| +----+ +----+ +----+p p+----+ +----+ +----+ | r
| | | | | | |o o| | | | | | | i
| | f3 | | f2 | | f0 |r CPSW r| f3 | | f2 | | f0 | | v
| |tc0 | |tc1 | |tc2 |t t|tc0 | |tc1 | |tc2 | | e
| \CBS / \CBS / \CBS /1 2\CBS / \CBS / \CBS / | r
| \S / \S / \ / \S / \S / \ / |
| \/ \/ \/ \/ \/ \/ |
+------------------------------------------------------------------+
========================================Eth==========================>
// Add 8 tx queues, for interface Eth0, but they are common, so are accessed // by two interfaces Eth0 and Eth1. $ ethtool -L eth1 rx 1 tx 8 rx unmodified, ignoring
// Check if num of queues is set correctly: $ ethtool -l eth0 Channel parameters for eth0: Pre-set maximums: RX: 8 TX: 8 Other: 0 Combined: 0 Current hardware settings: RX: 1 TX: 8 Other: 0 Combined: 0
// TX queues must be rated starting from 0, so set bws for tx0 and tx1 for Eth0 // and for tx2 and tx3 for Eth1. That is, rates 40 and 20 Mb/s appropriately // for Eth0 and 30 and 10 Mb/s for Eth1. // Real speed can differ a bit due to discreetness // Leave last 4 tx queues as not rated $ echo 40 > /sys/class/net/eth0/queues/tx-0/tx_maxrate $ echo 20 > /sys/class/net/eth0/queues/tx-1/tx_maxrate $ echo 30 > /sys/class/net/eth1/queues/tx-2/tx_maxrate $ echo 10 > /sys/class/net/eth1/queues/tx-3/tx_maxrate
// Check maximum rate of tx (cpdma) queues: $ cat /sys/class/net/eth0/queues/tx-*/tx_maxrate 40 20 30 10 0 0 0 0
// Map skb->priority to traffic class for Eth0: // 3pri -> tc0, 2pri -> tc1, (0,1,4-7)pri -> tc2 // Map traffic class to transmit queue: // tc0 -> txq0, tc1 -> txq1, tc2 -> (txq4, txq5) $ tc qdisc replace dev eth0 handle 100: parent root mqprio num_tc 3 \ map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 queues 1@0 1@1 2@4 hw 1
// Check classes settings $ tc -g class show dev eth0 +---(100:ffe2) mqprio | +---(100:5) mqprio | +---(100:6) mqprio | +---(100:ffe1) mqprio | +---(100:2) mqprio | +---(100:ffe0) mqprio +---(100:1) mqprio// Set rate for class A - 41 Mbit (tc0, txq0) using CBS Qdisc for Eth0 // here only idle slope is important, others ignored // Real speed can differ a bit due to discreetness $ tc qdisc add dev eth0 parent 100:1 cbs locredit -1470 \ hicredit 62 sendslope -959000 idleslope 41000 offload 1 net eth0: set FIFO3 bw = 50
// Set rate for class B - 21 Mbit (tc1, txq1) using CBS Qdisc for Eth0 $ tc qdisc add dev eth0 parent 100:2 cbs locredit -1470 \ hicredit 65 sendslope -979000 idleslope 21000 offload 1 net eth0: set FIFO2 bw = 30
// Create vlan 100 to map sk->priority to vlan qos for Eth0 $ ip link add link eth0 name eth0.100 type vlan id 100 net eth0: Adding vlanid 100 to vlan filter
// Map skb->priority to L2 prio for Eth0.100, one to one $ ip link set eth0.100 type vlan \ egress 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
// Check egress map for vlan 100 $ cat /proc/net/vlan/eth0.100 [...] INGRESS priority mappings: 0:0 1:0 2:0 3:0 4:0 5:0 6:0 7:0 EGRESS priority mappings: 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
// Map skb->priority to traffic class for Eth1: // 3pri -> tc0, 2pri -> tc1, (0,1,4-7)pri -> tc2 // Map traffic class to transmit queue: // tc0 -> txq2, tc1 -> txq3, tc2 -> (txq6, txq7) $ tc qdisc replace dev eth1 handle 100: parent root mqprio num_tc 3 \ map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 queues 1@2 1@3 2@6 hw 1
// Check classes settings $ tc -g class show dev eth1 +---(100:ffe2) mqprio | +---(100:7) mqprio | +---(100:8) mqprio | +---(100:ffe1) mqprio | +---(100:4) mqprio | +---(100:ffe0) mqprio +---(100:3) mqprio// Set rate for class A - 31 Mbit (tc0, txq2) using CBS Qdisc for Eth1 // here only idle slope is important, others ignored, but calculated // for interface speed - 100Mb for eth1 port. // Set it +1 Mb for reserve (important!) $ tc qdisc add dev eth1 parent 100:3 cbs locredit -1035 \ hicredit 465 sendslope -69000 idleslope 31000 offload 1 net eth1: set FIFO3 bw = 31
// Set rate for class B - 11 Mbit (tc1, txq3) using CBS Qdisc for Eth1 // Set it +1 Mb for reserve (important!) $ tc qdisc add dev eth1 parent 100:4 cbs locredit -1335 \ hicredit 405 sendslope -89000 idleslope 11000 offload 1 net eth1: set FIFO2 bw = 11
// Create vlan 100 to map sk->priority to vlan qos for Eth1 $ ip link add link eth1 name eth1.100 type vlan id 100 net eth1: Adding vlanid 100 to vlan filter
// Map skb->priority to L2 prio for Eth1.100, one to one $ ip link set eth1.100 type vlan \ egress 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
// Check egress map for vlan 100 $ cat /proc/net/vlan/eth1.100 [...] INGRESS priority mappings: 0:0 1:0 2:0 3:0 4:0 5:0 6:0 7:0 EGRESS priority mappings: 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
// Run appropriate tools with socket option "SO_PRIORITY" to 3 // for class A and to 2 for class B. For both interfaces ./tsn_talker -d 18:03:73:66:87:42 -i eth0.100 -p2 -s 1500& ./tsn_talker -d 18:03:73:66:87:42 -i eth0.100 -p3 -s 1500& ./tsn_talker -d 20:cf:30:85:7d:fd -i eth1.100 -p2 -s 1500& ./tsn_talker -d 20:cf:30:85:7d:fd -i eth1.100 -p3 -s 1500&
// run your listener on workstation (should be in same vlan) // (I took at https://www.spinics.net/lists/netdev/msg460869.html) ./tsn_listener -d 18:03:73:66:87:42 -i enp5s0 -s 1500 Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39012 kbps Receiving data rate: 39000 kbps
// Restore default configuration if needed $ ip link del eth1.100 $ ip link del eth0.100 $ tc qdisc del dev eth1 root net eth1: Prev FIFO2 is shaped net eth1: set FIFO3 bw = 0 net eth1: set FIFO2 bw = 0 $ tc qdisc del dev eth0 root net eth0: Prev FIFO2 is shaped net eth0: set FIFO3 bw = 0 net eth0: set FIFO2 bw = 0 $ ethtool -L eth0 rx 1 tx 1