William Tu williamtu
williamtu
/ gist:012f1ea97a3327249837ad37c8e2dc83
Last active
July 1, 2024 13:17
representer without OVS offload
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| #!/bin/bash | |
| PF1=eth2 | |
| VFREP1=eth4 | |
| VFREP2=eth5 | |
| VF1=eth6 | |
| VF2=eth7 | |
| NS1=ns1 | |
| NS2=ns2 | |
| NS3=ns3 |
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| rm -f /usr/local/etc/openvswitch/conf.db | |
| ovsdb-tool create /usr/local/etc/openvswitch/conf.db /root/ovs/vswitchd/vswitch.ovsschema | |
| ovsdb-server --remote=punix:/usr/local/var/run/openvswitch/db.sock \ | |
| --remote=db:Open_vSwitch,Open_vSwitch,manager_options \ | |
| --pidfile --detach | |
| if [ "$1" == "gdb" ]; then | |
| gdb -ex=r --args ovs-vswitchd --no-chdir --pidfile --log-file=/root/ovs/ovs-vswitchd.log -vvconn -vofproto_dpif -vunixctl --disable-system |
williamtu
/ gist:438477daedc3823ac8882f9110fb2cc4
Last active
September 6, 2023 13:35
create tun/tap device and read/write
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| cat tunclient.c | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #include <unistd.h> | |
| #include <net/if.h> | |
| #include <linux/if_tun.h> | |
| #include <sys/types.h> | |
| #include <sys/socket.h> | |
| #include <sys/ioctl.h> |
williamtu
/ gist:b9ac87419a48ba6d793e490b49b967e7
Last active
August 15, 2018 23:14
OOM kill ovs with af-xdp
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| [64701.441424] xsk_generic_xmit call direct xmit to ovs-p0 | |
| [64701.441440] xsk_generic_xmit done | |
| [64717.199367] ovs-vswitchd invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null), order=0, oom_score_adj=0 | |
| [64717.199369] ovs-vswitchd cpuset=/ mems_allowed=0 | |
| [64717.199373] CPU: 2 PID: 1412 Comm: ovs-vswitchd Tainted: G L 4.18.0-rc6+ #156 | |
| [64717.199373] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 05/19/2017 | |
| [64717.199374] Call Trace: | |
| [64717.200092] dump_stack+0x5c/0x7b | |
| [64717.200228] dump_header+0x6b/0x27c | |
| [64717.200830] oom_kill_process+0x239/0x440 |
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| make[1]: Leaving directory '/root/net-next' | |
| bpf_load_program() err=13 | |
| 0: (bf) r6 = r1 | |
| 1: (30) r0 = *(u8 *)skb[23] | |
| 2: (63) *(u32 *)(r10 -4) = r0 | |
| 3: (18) r1 = 0x9ffe7000 | |
| 5: (79) r2 = *(u64 *)(r1 +8) | |
| R1 invalid mem access 'map_ptr' | |
| --- |
williamtu
/ volatile-xdp9.c
Last active
April 14, 2017 18:41
xdp9.c (max BPF stack > 512), see 595: r5 = *(u64 *)(r10 - 600)
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| diff --git a/tmp/xdp9.c b/tests/xdp9.c | |
| index 0845fd5..9964d15 100644 | |
| --- a/tmp/xdp9.c | |
| +++ b/tests/xdp9.c | |
| @@ -1,4 +1,4 @@ | |
| -/* Automatically generated by p4c-xdp from xdp9.p4 on Fri Apr 14 10:34:12 2017 | |
| +/* Automatically generated by p4c-xdp from xdp9.p4 on Fri Apr 14 11:14:09 2017 | |
| */ | |
| #include "xdp9.h" | |
| #define KBUILD_MODNAME "xdptest" |
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| /* Automatically generated by p4c-xdp from xdp12.p4 on Fri Feb 17 08:32:10 2017 | |
| */ | |
| #include "xdp12.h" | |
| #define KBUILD_MODNAME "xdptest" | |
| #include <linux/bpf.h> | |
| #include "bpf_helpers.h" | |
| #define load_byte(data, b) (*(((u8*)(data)) + (b))) | |
| #define load_half(data, b) __constant_ntohs(*(u16 *)((u8*)(data) + (b))) | |
| #define load_word(data, b) __constant_ntohl(*(u32 *)((u8*)(data) + (b))) |
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| root@osboxes:~/net-next/samples/bpf# ./xdp_tx_iptunnel -i 2 -a 10.1.1.1 -p 10.2.2.2 -s 10.2.2.9 -d 10.1.2.3 -m 1:2:3:4:5:6 | |
| bpf_load_program() err=13 | |
| 0: (b7) r2 = 1 | |
| 1: (bf) r3 = r1 | |
| 2: (07) r3 += 4 | |
| 3: (bf) r4 = r1 | |
| 4: (bf) r5 = r1 | |
| 5: (61) r0 = *(u32 *)(r1 +4) | |
| 6: (61) r1 = *(u32 *)(r1 +0) | |
| 7: (bf) r6 = r1 |
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| xdp7.o: file format ELF64-BPF | |
| Disassembly of section prog: | |
| ebpf_filter: | |
| ; int ebpf_filter(struct xdp_md* skb){ | |
| 0: r6 = r1 | |
| ; void* ebpf_packetEnd = ((void*)(long)skb->data_end); | |
| 1: r3 = *(u32 *)(r6 + 4) | |
| ; void* ebpf_packetStart = ((void*)(long)skb->data); |
williamtu
/ gist:1ae888cea019d065eab3057f74d38905
Created
February 3, 2017 03:18
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| Map 'ebpf_outTable' loaded as pinned! | |
| Map 'ebpf_outTable' (5) injected into prog section 'prog' at offset 295! | |
| Prog section 'prog' loaded (6)! | |
| - Type: 6 | |
| - Instructions: 304 (0 over limit) | |
| - License: GPL | |
| Verifier analysis: |
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