542 lines
22 KiB
Plaintext
542 lines
22 KiB
Plaintext
* Texas Instruments CPSW ethernet driver
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Multiqueue & CBS & MQPRIO
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=====================================================================
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=====================================================================
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The cpsw has 3 CBS shapers for each external ports. This document
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describes MQPRIO and CBS Qdisc offload configuration for cpsw driver
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based on examples. It potentially can be used in audio video bridging
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(AVB) and time sensitive networking (TSN).
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The following examples were tested on AM572x EVM and BBB boards.
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Test setup
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==========
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Under consideration two examples with AM572x EVM running cpsw driver
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in dual_emac mode.
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Several prerequisites:
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- TX queues must be rated starting from txq0 that has highest priority
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- Traffic classes are used starting from 0, that has highest priority
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- CBS shapers should be used with rated queues
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- The bandwidth for CBS shapers has to be set a little bit more then
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potential incoming rate, thus, rate of all incoming tx queues has
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to be a little less
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- Real rates can differ, due to discreetness
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- Map skb-priority to txq is not enough, also skb-priority to l2 prio
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map has to be created with ip or vconfig tool
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- Any l2/socket prio (0 - 7) for classes can be used, but for
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simplicity default values are used: 3 and 2
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- only 2 classes tested: A and B, but checked and can work with more,
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maximum allowed 4, but only for 3 rate can be set.
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Test setup for examples
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=======================
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+-------------------------------+
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|--+ |
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| | Workstation0 |
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|E | MAC 18:03:73:66:87:42 |
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+-----------------------------+ +--|t | |
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| | 1 | E | | |h |./tsn_listener -d \ |
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| Target board: | 0 | t |--+ |0 | 18:03:73:66:87:42 -i eth0 \|
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| AM572x EVM | 0 | h | | | -s 1500 |
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| | 0 | 0 | |--+ |
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| Only 2 classes: |Mb +---| +-------------------------------+
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| class A, class B | |
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| | +---| +-------------------------------+
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| | 1 | E | |--+ |
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| | 0 | t | | | Workstation1 |
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| | 0 | h |--+ |E | MAC 20:cf:30:85:7d:fd |
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| |Mb | 1 | +--|t | |
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+-----------------------------+ |h |./tsn_listener -d \ |
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|0 | 20:cf:30:85:7d:fd -i eth0 \|
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| | -s 1500 |
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|--+ |
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+-------------------------------+
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*********************************************************************
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*********************************************************************
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*********************************************************************
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Example 1: One port tx AVB configuration scheme for target board
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----------------------------------------------------------------------
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(prints and scheme for AM572x evm, applicable for single port boards)
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tc - traffic class
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txq - transmit queue
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p - priority
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f - fifo (cpsw fifo)
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S - shaper configured
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+------------------------------------------------------------------+ u
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| +---------------+ +---------------+ +------+ +------+ | s
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| | | | | | | | | | e
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| | App 1 | | App 2 | | Apps | | Apps | | r
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| | Class A | | Class B | | Rest | | Rest | |
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| | Eth0 | | Eth0 | | Eth0 | | Eth1 | | s
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| | VLAN100 | | VLAN100 | | | | | | | | p
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| | 40 Mb/s | | 20 Mb/s | | | | | | | | a
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| | SO_PRIORITY=3 | | SO_PRIORITY=2 | | | | | | | | c
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| | | | | | | | | | | | | | e
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| +---|-----------+ +---|-----------+ +---|--+ +---|--+ |
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+-----|------------------|------------------|--------|-------------+
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+-+ +------------+ | |
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| | +-----------------+ +--+
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| | | |
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+---|-------|-------------|-----------------------|----------------+
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| +----+ +----+ +----+ +----+ +----+ |
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| | p3 | | p2 | | p1 | | p0 | | p0 | | k
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| \ / \ / \ / \ / \ / | e
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| \ / \ / \ / \ / \ / | r
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| \/ \/ \/ \/ \/ | n
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| | | | | | e
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| | | +-----+ | | l
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| | | | | |
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| +----+ +----+ +----+ +----+ | s
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| |tc0 | |tc1 | |tc2 | |tc0 | | p
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| \ / \ / \ / \ / | a
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| \ / \ / \ / \ / | c
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| \/ \/ \/ \/ | e
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| | | +-----+ | |
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| +----+ +----+ +----+ +----+ +----+ |
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| |txq0| |txq1| |txq2| |txq3| |txq4| |
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| \ / \ / \ / \ / \ / |
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| \ / \ / \ / \ / \ / |
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| \/ \/ \/ \/ \/ |
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| +-|------|------|------|--+ +--|--------------+ |
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| | | | | | | Eth0.100 | | Eth1 | |
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+---|------|------|------|------------------------|----------------+
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p p p p |
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3 2 0-1, 4-7 <- L2 priority |
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+---|------|------|------|------------------------|----------------+
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| | | | | |----------+ |
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| +----+ +----+ +----+ +----+ +----+ |
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| |dma7| |dma6| |dma5| |dma4| |dma3| |
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| \ / \ / \ / \ / \ / | c
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| \S / \S / \ / \ / \ / | p
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| \/ \/ \/ \/ \/ | s
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| | | | +----- | | w
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| | | | | | | d
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| +----+ +----+ +----+p p+----+ | r
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| | | | | | |o o| | | i
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| | f3 | | f2 | | f0 |r r| f0 | | v
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| |tc0 | |tc1 | |tc2 |t t|tc0 | | e
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| \CBS / \CBS / \CBS /1 2\CBS / | r
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| \S / \S / \ / \ / |
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| \/ \/ \/ \/ |
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+------------------------------------------------------------------+
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========================================Eth==========================>
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1)
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// Add 4 tx queues, for interface Eth0, and 1 tx queue for Eth1
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$ ethtool -L eth0 rx 1 tx 5
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rx unmodified, ignoring
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2)
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// Check if num of queues is set correctly:
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$ ethtool -l eth0
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Channel parameters for eth0:
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Pre-set maximums:
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RX: 8
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TX: 8
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Other: 0
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Combined: 0
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Current hardware settings:
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RX: 1
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TX: 5
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Other: 0
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Combined: 0
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3)
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// TX queues must be rated starting from 0, so set bws for tx0 and tx1
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// Set rates 40 and 20 Mb/s appropriately.
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// Pay attention, real speed can differ a bit due to discreetness.
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// Leave last 2 tx queues not rated.
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$ echo 40 > /sys/class/net/eth0/queues/tx-0/tx_maxrate
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$ echo 20 > /sys/class/net/eth0/queues/tx-1/tx_maxrate
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4)
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// Check maximum rate of tx (cpdma) queues:
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$ cat /sys/class/net/eth0/queues/tx-*/tx_maxrate
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40
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20
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0
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0
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0
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5)
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// Map skb->priority to traffic class:
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// 3pri -> tc0, 2pri -> tc1, (0,1,4-7)pri -> tc2
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// Map traffic class to transmit queue:
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// tc0 -> txq0, tc1 -> txq1, tc2 -> (txq2, txq3)
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$ tc qdisc replace dev eth0 handle 100: parent root mqprio num_tc 3 \
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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
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5a)
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// As two interface sharing same set of tx queues, assign all traffic
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// coming to interface Eth1 to separate queue in order to not mix it
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// with traffic from interface Eth0, so use separate txq to send
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// packets to Eth1, so all prio -> tc0 and tc0 -> txq4
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// Here hw 0, so here still default configuration for eth1 in hw
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$ tc qdisc replace dev eth1 handle 100: parent root mqprio num_tc 1 \
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map 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 queues 1@4 hw 0
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6)
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// Check classes settings
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$ tc -g class show dev eth0
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+---(100:ffe2) mqprio
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| +---(100:3) mqprio
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| +---(100:4) mqprio
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+---(100:ffe1) mqprio
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| +---(100:2) mqprio
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+---(100:ffe0) mqprio
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+---(100:1) mqprio
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$ tc -g class show dev eth1
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+---(100:ffe0) mqprio
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+---(100:5) mqprio
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7)
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// Set rate for class A - 41 Mbit (tc0, txq0) using CBS Qdisc
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// Set it +1 Mb for reserve (important!)
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// here only idle slope is important, others arg are ignored
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// Pay attention, real speed can differ a bit due to discreetness
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$ tc qdisc add dev eth0 parent 100:1 cbs locredit -1438 \
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hicredit 62 sendslope -959000 idleslope 41000 offload 1
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net eth0: set FIFO3 bw = 50
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8)
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// Set rate for class B - 21 Mbit (tc1, txq1) using CBS Qdisc:
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// Set it +1 Mb for reserve (important!)
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$ tc qdisc add dev eth0 parent 100:2 cbs locredit -1468 \
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hicredit 65 sendslope -979000 idleslope 21000 offload 1
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net eth0: set FIFO2 bw = 30
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9)
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// Create vlan 100 to map sk->priority to vlan qos
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$ ip link add link eth0 name eth0.100 type vlan id 100
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8021q: 802.1Q VLAN Support v1.8
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8021q: adding VLAN 0 to HW filter on device eth0
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8021q: adding VLAN 0 to HW filter on device eth1
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net eth0: Adding vlanid 100 to vlan filter
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10)
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// Map skb->priority to L2 prio, 1 to 1
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$ ip link set eth0.100 type vlan \
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egress 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
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11)
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// Check egress map for vlan 100
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$ cat /proc/net/vlan/eth0.100
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[...]
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INGRESS priority mappings: 0:0 1:0 2:0 3:0 4:0 5:0 6:0 7:0
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EGRESS priority mappings: 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
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12)
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// Run your appropriate tools with socket option "SO_PRIORITY"
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// to 3 for class A and/or to 2 for class B
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// (I took at https://www.spinics.net/lists/netdev/msg460869.html)
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./tsn_talker -d 18:03:73:66:87:42 -i eth0.100 -p3 -s 1500&
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./tsn_talker -d 18:03:73:66:87:42 -i eth0.100 -p2 -s 1500&
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13)
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// run your listener on workstation (should be in same vlan)
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// (I took at https://www.spinics.net/lists/netdev/msg460869.html)
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./tsn_listener -d 18:03:73:66:87:42 -i enp5s0 -s 1500
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Receiving data rate: 39012 kbps
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Receiving data rate: 39012 kbps
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Receiving data rate: 39012 kbps
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Receiving data rate: 39012 kbps
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Receiving data rate: 39012 kbps
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Receiving data rate: 39012 kbps
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Receiving data rate: 39012 kbps
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Receiving data rate: 39012 kbps
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Receiving data rate: 39012 kbps
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Receiving data rate: 39012 kbps
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Receiving data rate: 39012 kbps
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Receiving data rate: 39012 kbps
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Receiving data rate: 39000 kbps
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14)
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// Restore default configuration if needed
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$ ip link del eth0.100
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$ tc qdisc del dev eth1 root
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$ tc qdisc del dev eth0 root
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net eth0: Prev FIFO2 is shaped
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net eth0: set FIFO3 bw = 0
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net eth0: set FIFO2 bw = 0
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$ ethtool -L eth0 rx 1 tx 1
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*********************************************************************
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*********************************************************************
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*********************************************************************
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Example 2: Two port tx AVB configuration scheme for target board
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----------------------------------------------------------------------
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(prints and scheme for AM572x evm, for dual emac boards only)
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+------------------------------------------------------------------+ u
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| +----------+ +----------+ +------+ +----------+ +----------+ | s
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| | | | | | | | | | | | e
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| | App 1 | | App 2 | | Apps | | App 3 | | App 4 | | r
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| | Class A | | Class B | | Rest | | Class B | | Class A | |
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| | Eth0 | | Eth0 | | | | | Eth1 | | Eth1 | | s
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| | VLAN100 | | VLAN100 | | | | | VLAN100 | | VLAN100 | | p
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| | 40 Mb/s | | 20 Mb/s | | | | | 10 Mb/s | | 30 Mb/s | | a
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| | SO_PRI=3 | | SO_PRI=2 | | | | | SO_PRI=3 | | SO_PRI=2 | | c
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| +---|------+ +---|------+ +---|--+ +---|------+ +---|------+ |
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+-----|-------------|-------------|---------|-------------|--------+
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+-+ +-------+ | +----------+ +----+
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| | +-------+------+ | |
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+---|-------|-------------|--------------|-------------|-------|---+
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| +----+ +----+ +----+ +----+ +----+ +----+ +----+ +----+ |
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| | p3 | | p2 | | p1 | | p0 | | p0 | | p1 | | p2 | | p3 | | k
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| \ / \ / \ / \ / \ / \ / \ / \ / | e
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| \ / \ / \ / \ / \ / \ / \ / \ / | r
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| \/ \/ \/ \/ \/ \/ \/ \/ | n
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| | | | | | | | e
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| | | +----+ +----+ | | | l
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| +----+ +----+ +----+ +----+ +----+ +----+ | s
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| |tc0 | |tc1 | |tc2 | |tc2 | |tc1 | |tc0 | | p
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| \ / \ / \ / \ / \ / \ / | a
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| \ / \ / \ / \ / \ / \ / | c
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| \/ \/ \/ \/ \/ \/ | e
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| | | +-----+ +-----+ | | |
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| | | | | E E | | | | |
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| +----+ +----+ +----+ +----+ t t +----+ +----+ +----+ +----+ |
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| |txq0| |txq1| |txq4| |txq5| h h |txq6| |txq7| |txq3| |txq2| |
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| \ / \ / \ / \ / 0 1 \ / \ / \ / \ / |
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| \ / \ / \ / \ / . . \ / \ / \ / \ / |
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| \/ \/ \/ \/ 1 1 \/ \/ \/ \/ |
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| +-|------|------|------|--+ 0 0 +-|------|------|------|--+ |
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| | | | | | | 0 0 | | | | | | |
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+---|------|------|------|---------------|------|------|------|----+
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p p p p p p p p
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3 2 0-1, 4-7 <-L2 pri-> 0-1, 4-7 2 3
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+---|------|------|------|---------------|------|------|------|----+
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| | | | | | | | | |
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| +----+ +----+ +----+ +----+ +----+ +----+ +----+ +----+ |
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| |dma7| |dma6| |dma3| |dma2| |dma1| |dma0| |dma4| |dma5| |
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| \ / \ / \ / \ / \ / \ / \ / \ / | c
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| \S / \S / \ / \ / \ / \ / \S / \S / | p
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| \/ \/ \/ \/ \/ \/ \/ \/ | s
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| | | | +----- | | | | | w
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| | | | | +----+ | | | |
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| | | | | | | | | | d
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| +----+ +----+ +----+p p+----+ +----+ +----+ | r
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| | | | | | |o o| | | | | | | i
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| | f3 | | f2 | | f0 |r CPSW r| f3 | | f2 | | f0 | | v
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| |tc0 | |tc1 | |tc2 |t t|tc0 | |tc1 | |tc2 | | e
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| \CBS / \CBS / \CBS /1 2\CBS / \CBS / \CBS / | r
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| \S / \S / \ / \S / \S / \ / |
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| \/ \/ \/ \/ \/ \/ |
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+------------------------------------------------------------------+
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========================================Eth==========================>
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1)
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// Add 8 tx queues, for interface Eth0, but they are common, so are accessed
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// by two interfaces Eth0 and Eth1.
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$ ethtool -L eth1 rx 1 tx 8
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rx unmodified, ignoring
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2)
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// Check if num of queues is set correctly:
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$ ethtool -l eth0
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Channel parameters for eth0:
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Pre-set maximums:
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RX: 8
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TX: 8
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Other: 0
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Combined: 0
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Current hardware settings:
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RX: 1
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TX: 8
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Other: 0
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Combined: 0
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3)
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// TX queues must be rated starting from 0, so set bws for tx0 and tx1 for Eth0
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// and for tx2 and tx3 for Eth1. That is, rates 40 and 20 Mb/s appropriately
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// for Eth0 and 30 and 10 Mb/s for Eth1.
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// Real speed can differ a bit due to discreetness
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// Leave last 4 tx queues as not rated
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$ echo 40 > /sys/class/net/eth0/queues/tx-0/tx_maxrate
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$ echo 20 > /sys/class/net/eth0/queues/tx-1/tx_maxrate
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$ echo 30 > /sys/class/net/eth1/queues/tx-2/tx_maxrate
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$ echo 10 > /sys/class/net/eth1/queues/tx-3/tx_maxrate
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4)
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// Check maximum rate of tx (cpdma) queues:
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$ cat /sys/class/net/eth0/queues/tx-*/tx_maxrate
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40
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20
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30
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10
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0
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0
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0
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0
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5)
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// Map skb->priority to traffic class for Eth0:
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// 3pri -> tc0, 2pri -> tc1, (0,1,4-7)pri -> tc2
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// Map traffic class to transmit queue:
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// tc0 -> txq0, tc1 -> txq1, tc2 -> (txq4, txq5)
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$ tc qdisc replace dev eth0 handle 100: parent root mqprio num_tc 3 \
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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
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6)
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// Check classes settings
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$ tc -g class show dev eth0
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+---(100:ffe2) mqprio
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| +---(100:5) mqprio
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| +---(100:6) mqprio
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+---(100:ffe1) mqprio
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| +---(100:2) mqprio
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+---(100:ffe0) mqprio
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+---(100:1) mqprio
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7)
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// Set rate for class A - 41 Mbit (tc0, txq0) using CBS Qdisc for Eth0
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// here only idle slope is important, others ignored
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// Real speed can differ a bit due to discreetness
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$ tc qdisc add dev eth0 parent 100:1 cbs locredit -1470 \
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hicredit 62 sendslope -959000 idleslope 41000 offload 1
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net eth0: set FIFO3 bw = 50
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8)
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// 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
|
|
|
|
9)
|
|
// 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
|
|
|
|
10)
|
|
// 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
|
|
|
|
11)
|
|
// 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
|
|
|
|
12)
|
|
// 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
|
|
|
|
13)
|
|
// 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
|
|
|
|
14)
|
|
// 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
|
|
|
|
15)
|
|
// 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
|
|
|
|
16)
|
|
// 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
|
|
|
|
17)
|
|
// 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
|
|
|
|
18)
|
|
// 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
|
|
|
|
19)
|
|
// 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&
|
|
|
|
20)
|
|
// 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
|
|
|
|
21)
|
|
// 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
|