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Date: Sat, 21 Jul 2018 19:46:49 +0300
From: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To: Richard Cochran <richardcochran@...il.com>
Cc: davem@...emloft.net, grygorii.strashko@...com, corbet@....net,
akpm@...ux-foundation.org, netdev@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-omap@...r.kernel.org, vinicius.gomes@...el.com,
henrik@...tad.us, jesus.sanchez-palencia@...el.com,
ilias.apalodimas@...aro.org, p-varis@...com, spatton@...com,
francois.ozog@...aro.org, yogeshs@...com, nsekhar@...com,
andrew@...n.ch
Subject: Re: [PATCH v4 net-next 6/6] Documentation: networking: cpsw: add
MQPRIO & CBS offload examples
On Sat, Jul 21, 2018 at 08:10:29AM -0700, Richard Cochran wrote:
>On Sat, Jul 21, 2018 at 02:59:23PM +0300, Ivan Khoronzhuk wrote:
>> This document describes MQPRIO and CBS Qdisc offload configuration
>> for cpsw driver based on examples. It potentially can be used in
>> audio video bridging (AVB) and time sensitive networking (TSN).
>>
>> Reviewed-by: Grygorii Strashko <grygorii.strashko@...com>
>> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
>> ---
>> Documentation/networking/ti-cpsw.txt | 540 +++++++++++++++++++++++++++
>> 1 file changed, 540 insertions(+)
>> create mode 100644 Documentation/networking/ti-cpsw.txt
>>
>> diff --git a/Documentation/networking/ti-cpsw.txt b/Documentation/networking/ti-cpsw.txt
>> new file mode 100644
>> index 000000000000..1e840346cae1
>> --- /dev/null
>> +++ b/Documentation/networking/ti-cpsw.txt
>> @@ -0,0 +1,540 @@
>> +* Texas Instruments CPSW ethernet driver
>> +
>> +Multiqueue & CBS & MQPRIO
>> +=====================================================================
>> +=====================================================================
>> +
>> +The cpsw has 3 CBS shapers for each external ports. This document
>> +describes MQPRIO and CBS Qdisc offload configuration for cpsw driver
>> +based on examples. It potentially can be used in audio video bridging
>> +(AVB) and time sensitive networking (TSN).
>> +
>> +The following examples was tested on AM572x EVM and BBB boards.
>> +
>> +Test setup
>> +==========
>> +
>> +Under consideration two examples with AM52xx EVM running cpsw driver
>> +in dual_emac mode.
>
>s/AM52xx/AM572x ?
yes, AM572x
>
>Also, there are more mentions of AM52xx, below.
I'll correct.
>
>Thanks,
>Richard
>
>
>> +
>> +Several prerequisites:
>> +- TX queues must be rated starting from txq0 that has highest priority
>> +- Traffic classes are used starting from 0, that has highest priority
>> +- CBS shapers should be used with rated queues
>> +- The bandwidth for CBS shapers has to be set a little bit more then
>> + potential incoming rate, thus, rate of all incoming tx queues has
>> + to be a little less
>> +- Real rates can differ, due to discreetness
>> +- Map skb-priority to txq is not enough, also skb-priority to l2 prio
>> + map has to be created with ip or vconfig tool
>> +- Any l2/socket prio (0 - 7) for classes can be used, but for
>> + simplicity default values are used: 3 and 2
>> +- only 2 classes tested: A and B, but checked and can work with more,
>> + maximum allowed 4, but only for 3 rate can be set.
>> +
>> +Test setup for examples
>> +=======================
>> + +-------------------------------+
>> + |--+ |
>> + | | 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 |
>> + |--+ |
>> + +-------------------------------+
>> +
>> +*********************************************************************
>> +*********************************************************************
>> +*********************************************************************
>> +Example 1: One port tx AVB configuration scheme for target board
>> +----------------------------------------------------------------------
>> +(prints and scheme for AM52xx evm, applicable for single port boards)
>> +
>> +tc - traffic class
>> +txq - transmit queue
>> +p - priority
>> +f - fifo (cpsw fifo)
>> +S - shaper configured
>> +
>> ++------------------------------------------------------------------+ 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 / \ / \ / |
>> +| \/ \/ \/ \/ |
>> ++------------------------------------------------------------------+
>> +========================================Eth==========================>
>> +
>> +1)
>> +// Add 4 tx queues, for interface Eth0, and 1 tx queue for Eth1
>> +$ ethtool -L eth0 rx 1 tx 5
>> +rx unmodified, ignoring
>> +
>> +2)
>> +// 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
>> +
>> +3)
>> +// 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
>> +
>> +4)
>> +// Check maximum rate of tx (cpdma) queues:
>> +$ cat /sys/class/net/eth0/queues/tx-*/tx_maxrate
>> +40
>> +20
>> +0
>> +0
>> +0
>> +
>> +5)
>> +// 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
>> +
>> +6)
>> +// 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
>> +
>> +7)
>> +// 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
>> +
>> +8)
>> +// 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
>> +
>> +9)
>> +// 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
>> +
>> +10)
>> +// 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
>> +
>> +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)
>> +// 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&
>> +
>> +13)
>> +// 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
>> +
>> +14)
>> +// 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
>> +
>> +*********************************************************************
>> +*********************************************************************
>> +*********************************************************************
>> +Example 2: Two port tx AVB configuration scheme for target board
>> +----------------------------------------------------------------------
>> +(prints and scheme for AM52xx evm, for dual emac boards only)
>> +
>> ++------------------------------------------------------------------+ 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==========================>
>> +
>> +1)
>> +// 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
>> +
>> +2)
>> +// 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
>> +
>> +3)
>> +// 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
>> +
>> +4)
>> +// Check maximum rate of tx (cpdma) queues:
>> +$ cat /sys/class/net/eth0/queues/tx-*/tx_maxrate
>> +40
>> +20
>> +30
>> +10
>> +0
>> +0
>> +0
>> +0
>> +
>> +5)
>> +// 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
>> +
>> +6)
>> +// 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
>> +
>> +7)
>> +// 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
>> +
>> +8)
>> +// 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
>> +// Set it +1 Mb for reserve (important!)
>> +$ tc qdisc add dev eth1 parent 100:3 cbs locredit -1453 \
>> +hicredit 47 sendslope -969000 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 -1483 \
>> +hicredit 34 sendslope -989000 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
>> --
>> 2.17.1
>>
--
Regards,
Ivan Khoronzhuk
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