netdev - Re: DSA switch

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Date:   Thu, 3 May 2018 09:50:52 +0300
From:   Ran Shalit <ranshalit@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org
Subject: Re: DSA switch

On Wed, May 2, 2018 at 11:56 PM, Andrew Lunn <andrew@...n.ch> wrote:
> On Wed, May 02, 2018 at 11:20:05PM +0300, Ran Shalit wrote:
>> Hello,
>>
>> Is it possible to use switch just like external real switch,
>> connecting all ports to the same subnet ?
>
> Yes. Just bridge all ports/interfaces together and put your host IP
> address on the bridge.
>
>         Andrew


Hi,

I get error on trying to add bridge.
I am trying to =understand which configuration is missing probably in my kernel,
 I ran strace, but not sure , does it point to any missing configuration ?

root@...14x-evm:~# ip link add br0 type bridge
RTNETLINK answers: Operation not supported

root@...14x-evm:~# ./strace ip link add br0 type bridge
execve("/bin/ip", ["ip", "link", "add", "br0", "type", "bridge"], [/*
11 vars */]) = 0
brk(0)                                  = 0x44000
uname({sys="Linux", node="dm814x-evm", ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x400c1000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = -1 ENOENT (No such file or directory)
open("/lib/tls/v7l/fast-mult/half/libresolv.so.2", O_RDONLY) = -1
ENOENT (No such file or directory)
stat64("/lib/tls/v7l/fast-mult/half", 0xbe8bb3c0) = -1 ENOENT (No such
file or directory)
open("/lib/tls/v7l/fast-mult/libresolv.so.2", O_RDONLY) = -1 ENOENT
(No such file or directory)
stat64("/lib/tls/v7l/fast-mult", 0xbe8bb3c0) = -1 ENOENT (No such file
or directory)
open("/lib/tls/v7l/half/libresolv.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/lib/tls/v7l/half", 0xbe8bb3c0) = -1 ENOENT (No such file or directory)
open("/lib/tls/v7l/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat64("/lib/tls/v7l", 0xbe8bb3c0)      = -1 ENOENT (No such file or directory)
open("/lib/tls/fast-mult/half/libresolv.so.2", O_RDONLY) = -1 ENOENT
(No such file or directory)
stat64("/lib/tls/fast-mult/half", 0xbe8bb3c0) = -1 ENOENT (No such
file or directory)
open("/lib/tls/fast-mult/libresolv.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/lib/tls/fast-mult", 0xbe8bb3c0) = -1 ENOENT (No such file or directory)
open("/lib/tls/half/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat64("/lib/tls/half", 0xbe8bb3c0)     = -1 ENOENT (No such file or directory)
open("/lib/tls/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/lib/tls", 0xbe8bb3c0)          = -1 ENOENT (No such file or directory)
open("/lib/v7l/fast-mult/half/libresolv.so.2", O_RDONLY) = -1 ENOENT
(No such file or directory)
stat64("/lib/v7l/fast-mult/half", 0xbe8bb3c0) = -1 ENOENT (No such
file or directory)
open("/lib/v7l/fast-mult/libresolv.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/lib/v7l/fast-mult", 0xbe8bb3c0) = -1 ENOENT (No such file or directory)
open("/lib/v7l/half/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat64("/lib/v7l/half", 0xbe8bb3c0)     = -1 ENOENT (No such file or directory)
open("/lib/v7l/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file or
directory)
stat64("/lib/v7l", 0xbe8bb3c0)          = -1 ENOENT (No such file or directory)
open("/lib/fast-mult/half/libresolv.so.2", O_RDONLY) = -1 ENOENT (No
such file or directory)
stat64("/lib/fast-mult/half", 0xbe8bb3c0) = -1 ENOENT (No such file or
directory)
open("/lib/fast-mult/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such
file or directory)
stat64("/lib/fast-mult", 0xbe8bb3c0)    = -1 ENOENT (No such file or directory)
open("/lib/half/libresolv.so.2", O_RDONLY) = -1 ENOENT (No such file
or directory)
stat64("/lib/half", 0xbe8bb3c0)         = -1 ENOENT (No such file or directory)
open("/lib/libresolv.so.2", O_RDONLY)   = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\234
\0\0004\0\0\0"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=67624, ...}) = 0
mmap2(NULL, 108588, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x40164000
mprotect(0x40174000, 28672, PROT_NONE)  = 0
mmap2(0x4017b000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf) = 0x4017b000
mmap2(0x4017d000, 6188, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4017d000
close(3)                                = 0
open("/lib/libdl.so.2", O_RDONLY)       = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0l\n\0\0004\0\0\0"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=18080, ...}) = 0
mmap2(NULL, 49364, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x400b2000
mprotect(0x400b6000, 28672, PROT_NONE)  = 0
mmap2(0x400bd000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3) = 0x400bd000
close(3)                                = 0
open("/lib/libgcc_s.so.1", O_RDONLY)    = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0x'\0\0004\0\0\0"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=70650, ...}) = 0
mmap2(NULL, 79984, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3,
0) = 0x400d1000
mprotect(0x400dd000, 28672, PROT_NONE)  = 0
mmap2(0x400e4000, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xb) = 0x400e4000
close(3)                                = 0
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\240Q\1\0004\0\0\0"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1181160, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x400c2000
mmap2(NULL, 1217096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE,
3, 0) = 0x4017f000
mprotect(0x4029c000, 28672, PROT_NONE)  = 0
mmap2(0x402a3000, 12288, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x11c) = 0x402a3000
mmap2(0x402a6000, 8776, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x402a6000
close(3)                                = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x400e5000
set_tls(0x400e54a0, 0x400e5b70, 0x4002867c, 0x400e5b78, 0x40028050) = 0
mprotect(0x402a3000, 8192, PROT_READ)   = 0
mprotect(0x400bd000, 4096, PROT_READ)   = 0
mprotect(0x4017b000, 4096, PROT_READ)   = 0
mprotect(0x40027000, 4096, PROT_READ)   = 0
socket(PF_NETLINK, SOCK_RAW, 0)         = 3
setsockopt(3, SOL_SOCKET, SO_SNDBUF, [32768], 4) = 0
setsockopt(3, SOL_SOCKET, SO_RCVBUF, [1048576], 4) = 0
bind(3, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 0
getsockname(3, {sa_family=AF_NETLINK, pid=1274, groups=00000000}, [12]) = 0
gettimeofday({1356950670, 688093}, NULL) = 0
send(3, " \0\0\0\20\0\5\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",
32, 0) = 32
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0,
groups=00000000},
msg_iov(1)=[{"4\0\0\0\2\0\0\0\0\0\0\0\372\4\0\0\355\377\377\377
\0\0\0\20\0\5\0\0\0\0\0"..., 8192}], msg_controllen=0, msg_flags=0},
0) = 52
send(3, "\24\0\0\0\22\0\1\3\217l\341P\0\0\0\0\0\0\0\0", 20, 0) = 20
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0,
groups=00000000},
msg_iov(1)=[{"\254\1\0\0\20\0\2\0\217l\341P\372\4\0\0\0\0\4\3\1\0\0\0I\0\1\0\0\0\0\0"...,
16384}], msg_controllen=0, msg_flags=0}, 0) = 2664
brk(0)                                  = 0x44000
brk(0x65000)                            = 0x65000
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0,
groups=00000000},
msg_iov(1)=[{"\24\0\0\0\3\0\2\0\217l\341P\372\4\0\0\0\0\0\0\1\0\0\0I\0\1\0\0\0\0\0"...,
16384}], msg_controllen=0, msg_flags=0}, 0) = 20
open("/usr/lib//ip/link_bridge.so", O_RDONLY) = -1 ENOENT (No such
file or directory)
sendmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0,
groups=00000000},
msg_iov(1)=[{"8\0\0\0\20\0\5\6\220l\341P\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
56}], msg_controllen=0, msg_flags=0}, 0) = 56
recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0,
groups=00000000},
msg_iov(1)=[{"L\0\0\0\2\0\0\0\220l\341P\372\4\0\0\241\377\377\3778\0\0\0\20\0\5\6\220l\341P"...,
16384}], msg_controllen=0, msg_flags=0}, 0) = 76
dup(2)                                  = 4
fcntl64(4, F_GETFL)                     = 0x20002 (flags O_RDWR|O_LARGEFILE)
fstat64(4, {st_mode=S_IFCHR|0600, st_rdev=makedev(252, 0), ...}) = 0
ioctl(4, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or
TCGETS, {B115200 opost isig icanon echo ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x4011b000
_llseek(4, 0, 0xbe8b7510, SEEK_CUR)     = -1 ESPIPE (Illegal seek)
write(4, "RTNETLINK answers: Operation not"..., 43RTNETLINK answers:
Operation not supported
) = 43
close(4)                                = 0
munmap(0x4011b000, 4096)                = 0
exit_group(2)                           = ?
root@...14x-evm:~#


Thank you,
ran