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Date: Sat, 21 Jul 2018 08:10:29 -0700
From: Richard Cochran <richardcochran@...il.com>
To: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
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 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 ?
Also, there are more mentions of AM52xx, below.
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
>
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