williamtu

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

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

[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

williamtu

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

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"

williamtu

/* 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)))

williamtu

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

williamtu

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

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:

williamtu

xdp3.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:	r4 = *(u32 *)(r6 + 4)
; void* ebpf_packetStart = ((void*)(long)skb->data);