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Date: Thu, 2 Aug 2018 09:13:29 +0100
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: netdev <netdev@...r.kernel.org>
Subject: Re: [Query]: DSA Understanding
Hi Andrew,
Thank for your reply.
On Thu, Jul 26, 2018 at 4:39 PM, Andrew Lunn <andrew@...n.ch> wrote:
>> I am bit confused on how dsa needs to be actually working,
>> Q's
>> 1] should I be running a dhcp server on eth1 (where switch is connected)
>> so that devices connected on lan* devices get an ip ?
>
> Nope. You need eth1 up, but otherwise you do not use it. Use the lanX
> interfaces like normal Linux interfaces. Run your dhclient on lanX, etc.
>>
>> 2] From the device where switch is connected if the cpu port wants to send
>> any data to any other user ports lan* how do i do it (just open
>> socket on eth1 or lan*) ?
>
> Just treat the lanX interfaces as normal Linux interfaces.
>
I have some more query’s on DSA.
I have manged to get the TI's cpsw slave1 connected to ksz9897
Ethernet switch chip partially working,
I have PC connected to lan4(ip = 169.254..126.126) and the PC ip is
169.254.78.251,
but when I ping from PC to lan4 I get Destination Host Unreachable,
but where as I can see
that in the tcpdump log for lan4 it does reply back, but it doesn’t
reach the PC, Is there I am missing
something here ?
Log from the device on which switch is present:
===================================
~$ ifconfig
eth0 Link encap:Ethernet HWaddr C4:F3:12:08:FE:7E
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:102
eth1 Link encap:Ethernet HWaddr C4:F3:12:08:FE:7F
inet6 addr: fe80::c6f3:12ff:fe08:fe7f%lo/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:436 errors:0 dropped:0 overruns:0 frame:0
TX packets:516 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:37254 (36.3 KiB) TX bytes:51585 (50.3 KiB)
lan4 Link encap:Ethernet HWaddr C4:F3:12:08:FE:7F
inet addr:169.254.126.126 Bcast:169.254.255.255 Mask:255.255.0.0
inet6 addr: fe80::c6f3:12ff:fe08:fe7f%lo/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:436 errors:0 dropped:0 overruns:0 frame:0
TX packets:444 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:28970 (28.2 KiB) TX bytes:35214 (34.3 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1%1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:67 errors:0 dropped:0 overruns:0 frame:0
TX packets:67 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6618 (6.4 KiB) TX bytes:6618 (6.4 KiB)
~$ tcpdump -i lan4 -v
[ 661.057166] device lan4 entered promiscuous mode
[ 661.061814] device eth1 entered promiscuous mode
tcpdump: listening on lan4, link-type EN10MB (Ethernet), capture size
262144 bytes
07:40:20.255355 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000 tell tango-charlie.local, length 46
07:40:20.255393 ARP, Ethernet (len 6), IPv4 (len 4), Reply
VB4-SN00000000 is-at c4:f3:12:08:fe:7f (oui Unknown), length 28
07:40:20.360936 IP6 (flowlabel 0x970aa, hlim 255, next-header UDP (17)
payload length: 53) VB4-SN00000000.mdns > ff02::fb.mdns: [udp sum o)
07:40:20.361085 IP (tos 0x0, ttl 255, id 17259, offset 0, flags [DF],
proto UDP (17), length 73)
VB4-SN00000000.mdns > 224.0.0.251.mdns: 0 PTR (QM)?
251.78.254.169.in-addr.arpa. (45)
07:40:20.361848 IP (tos 0x0, ttl 255, id 1808, offset 0, flags [DF],
proto UDP (17), length 100)
tango-charlie.local.mdns > 224.0.0.251.mdns: 0*- [0q] 1/0/0
251.78.254.169.in-addr.arpa. (Cache flush) PTR tango-charlie.local.
(72)
07:40:20.465933 IP6 (flowlabel 0x970aa, hlim 255, next-header UDP (17)
payload length: 98) VB4-SN00000000.mdns > ff02::fb.mdns: [udp sum o)
07:40:20.466124 IP (tos 0x0, ttl 255, id 17288, offset 0, flags [DF],
proto UDP (17), length 118)
VB4-SN00000000.mdns > 224.0.0.251.mdns: 0 PTR (QM)?
b.f.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.f.f.ip6.arpa.
(90)
07:40:21.254161 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000 tell tango-charlie.local, length 46
07:40:21.254181 ARP, Ethernet (len 6), IPv4 (len 4), Reply
VB4-SN00000000 is-at c4:f3:12:08:fe:7f (oui Unknown), length 28
07:40:25.470288 IP6 (flowlabel 0x970aa, hlim 255, next-header UDP (17)
payload length: 50) VB4-SN00000000.mdns > ff02::fb.mdns: [udp sum o)
07:40:31.301929 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000 tell tango-charlie.local, length 46
07:40:31.301957 ARP, Ethernet (len 6), IPv4 (len 4), Reply
VB4-SN00000000 is-at c4:f3:12:08:fe:7f (oui Unknown), length 28
07:40:32.319104 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000 tell tango-charlie.local, length 46
07:40:32.319131 ARP, Ethernet (len 6), IPv4 (len 4), Reply
VB4-SN00000000 is-at c4:f3:12:08:fe:7f (oui Unknown), length 28
07:40:33.317874 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000 tell tango-charlie.local, length 46
07:40:33.317900 ARP, Ethernet (len 6), IPv4 (len 4), Reply
VB4-SN00000000 is-at c4:f3:12:08:fe:7f (oui Unknown), length 28
07:40:34.317840 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000 tell tango-charlie.local, length 46
07:40:34.317866 ARP, Ethernet (len 6), IPv4 (len 4), Reply
VB4-SN00000000 is-at c4:f3:12:08:fe:7f (oui Unknown), length 28
~$ ethtool -S eth1
NIC statistics:
Good Rx Frames: 715
Broadcast Rx Frames: 553
Multicast Rx Frames: 162
Pause Rx Frames: 0
Rx CRC Errors: 0
Rx Align/Code Errors: 0
Oversize Rx Frames: 0
Rx Jabbers: 0
Undersize (Short) Rx Frames: 0
Rx Fragments: 0
Rx Octets: 63055
Good Tx Frames: 812
Broadcast Tx Frames: 34
Multicast Tx Frames: 283
Pause Tx Frames: 0
Deferred Tx Frames: 0
Collisions: 0
Single Collision Tx Frames: 0
Multiple Collision Tx Frames: 0
Excessive Collisions: 0
Late Collisions: 0
Tx Underrun: 0
Carrier Sense Errors: 0
Tx Octets: 85250
Rx + Tx 64 Octet Frames: 0
Rx + Tx 65-127 Octet Frames: 1287
Rx + Tx 128-255 Octet Frames: 168
Rx + Tx 256-511 Octet Frames: 72
Rx + Tx 512-1023 Octet Frames: 0
Rx + Tx 1024-Up Octet Frames: 0
Net Octets: 148305
Rx Start of Frame Overruns: 0
Rx Middle of Frame Overruns: 0
Rx DMA Overruns: 0
Rx DMA chan 0: head_enqueue: 1
Rx DMA chan 0: tail_enqueue: 813
Rx DMA chan 0: pad_enqueue: 0
Rx DMA chan 0: misqueued: 0
Rx DMA chan 0: desc_alloc_fail: 0
Rx DMA chan 0: pad_alloc_fail: 0
Rx DMA chan 0: runt_receive_buf: 0
Rx DMA chan 0: runt_transmit_bu: 0
Rx DMA chan 0: empty_dequeue: 0
Rx DMA chan 0: busy_dequeue: 668
Rx DMA chan 0: good_dequeue: 686
Rx DMA chan 0: requeue: 0
Rx DMA chan 0: teardown_dequeue: 0
Tx DMA chan 0: head_enqueue: 812
Tx DMA chan 0: tail_enqueue: 0
Tx DMA chan 0: pad_enqueue: 0
Tx DMA chan 0: misqueued: 0
Tx DMA chan 0: desc_alloc_fail: 0
Tx DMA chan 0: pad_alloc_fail: 0
Tx DMA chan 0: runt_receive_buf: 0
Tx DMA chan 0: runt_transmit_bu: 502
Tx DMA chan 0: empty_dequeue: 812
Tx DMA chan 0: busy_dequeue: 0
Tx DMA chan 0: good_dequeue: 812
Tx DMA chan 0: requeue: 0
Tx DMA chan 0: teardown_dequeue: 0
p05_rx_hi: 0
p05_rx_undersize: 0
p05_rx_fragments: 0
p05_rx_oversize: 0
p05_rx_jabbers: 0
p05_rx_symbol_err: 0
p05_rx_crc_err: 0
p05_rx_align_err: 0
p05_rx_mac_ctrl: 0
p05_rx_pause: 0
p05_rx_bcast: 34
p05_rx_mcast: 283
p05_rx_ucast: 495
p05_rx_64_or_less: 0
p05_rx_65_127: 675
p05_rx_128_255: 87
p05_rx_256_511: 50
p05_rx_512_1023: 0
p05_rx_1024_1522: 0
p05_rx_1523_2000: 0
p05_rx_2001: 0
p05_tx_hi: 0
p05_tx_late_col: 0
p05_tx_pause: 0
p05_tx_bcast: 553
p05_tx_mcast: 165
p05_tx_ucast: 0
p05_tx_deferred: 0
p05_tx_total_col: 0
p05_tx_exc_col: 0
p05_tx_single_col: 0
p05_tx_mult_col: 0
p05_rx_total: 85250
p05_tx_total: 63473
p05_rx_discards: 505
p05_tx_discards: 0
~$
~$ ethtool -S lan4
NIC statistics:
tx_packets: 736
tx_bytes: 59572
rx_packets: 701
rx_bytes: 45521
rx_hi: 0
rx_undersize: 0
rx_fragments: 0
rx_oversize: 0
rx_jabbers: 0
rx_symbol_err: 0
rx_crc_err: 0
rx_align_err: 0
rx_mac_ctrl: 0
rx_pause: 0
rx_bcast: 602
rx_mcast: 448
rx_ucast: 495
rx_64_or_less: 562
rx_65_127: 742
rx_128_255: 169
rx_256_511: 72
rx_512_1023: 0
rx_1024_1522: 0
rx_1523_2000: 0
rx_2001: 0
tx_hi: 0
tx_late_col: 0
tx_pause: 0
tx_bcast: 582
tx_mcast: 376
tx_ucast: 0
tx_deferred: 0
tx_total_col: 0
tx_exc_col: 0
tx_single_col: 0
tx_mult_col: 0
rx_total: 148965
tx_total: 104929
rx_discards: 505
tx_discards: 0
~$
Logs from the PC:
===================================
prabhakar@...go-charlie:~/Desktop/test$ ifconfig enx00e04c68c229
enx00e04c68c229 Link encap:Ethernet HWaddr 00:e0:4c:68:c2:29
inet addr:169.254.78.251 Bcast:169.254.255.255 Mask:255.255.0.0
inet6 addr: fe80::7cd0:12d6:d4bb:fc8b/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:209 errors:0 dropped:0 overruns:0 frame:0
TX packets:842 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:38308 (38.3 KB) TX bytes:60751 (60.7 KB)
prabhakar@...go-charlie:~/Desktop/test$ ping -I enx00e04c68c229 169.254.126.126
PING 169.254.126.126 (169.254.126.126) from 169.254.78.251
enx00e04c68c229: 56(84) bytes of data.
>From 169.254.78.251 icmp_seq=1 Destination Host Unreachable
>From 169.254.78.251 icmp_seq=2 Destination Host Unreachable
>From 169.254.78.251 icmp_seq=3 Destination Host Unreachable
>From 169.254.78.251 icmp_seq=4 Destination Host Unreachable
>From 169.254.78.251 icmp_seq=5 Destination Host Unreachable
>From 169.254.78.251 icmp_seq=6 Destination Host Unreachable
^C
--- 169.254.126.126 ping statistics ---
8 packets transmitted, 0 received, +6 errors, 100% packet loss, time 6999ms
pipe 4
prabhakar@...go-charlie:~/Desktop/test$ sudo tcpdump -i enx00e04c68c229 -v
[sudo] password for prabhakar:
tcpdump: listening on enx00e04c68c229, link-type EN10MB (Ethernet),
capture size 262144 bytes
09:09:39.692909 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000.local tell tango-charlie, length 28
09:09:39.794135 IP6 (flowlabel 0xaf44f, hlim 255, next-header UDP (17)
payload length: 54) tango-charlie.mdns > ff02::fb.mdns: [bad udp cksum
0x5fb4 -> 0x8657!] 0 PTR (QM)? 126.126.254.169.in-addr.arpa. (46)
09:09:39.794196 IP (tos 0x0, ttl 255, id 32415, offset 0, flags [DF],
proto UDP (17), length 74)
tango-charlie.mdns > 224.0.0.251.mdns: 0 PTR (QM)?
126.126.254.169.in-addr.arpa. (46)
09:09:39.795280 IP (tos 0x0, ttl 255, id 37104, offset 0, flags [DF],
proto UDP (17), length 102)
VB4-SN00000000.local.mdns > 224.0.0.251.mdns: 0*- [0q] 1/0/0
126.126.254.169.in-addr.arpa. (Cache flush) PTR VB4-SN00000000.local.
(74)
09:09:40.692890 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000.local tell tango-charlie, length 28
09:09:41.710153 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000.local tell tango-charlie, length 28
09:09:42.708884 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000.local tell tango-charlie, length 28
09:09:43.708884 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000.local tell tango-charlie, length 28
09:09:44.726124 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000.local tell tango-charlie, length 28
09:09:45.724892 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000.local tell tango-charlie, length 28
09:09:46.724887 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has
VB4-SN00000000.local tell tango-charlie, length 28
^C
11 packets captured
11 packets received by filter
0 packets dropped by kernel
Cheers,
--Prabhakar
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