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Kernel modules crash when trying to attach a physical ixgbe interface to the VALE switch

Hi, I'm trying to connect my VM's netmap-aware service through the physical 10GB interface on the host using ptnetmap.

I'm running Ubuntu 14.04.3 with 3.13.0-66-generic. For higher Kernel versions of this release, the ptnetmap compilation fails (3.16 and 3.19).

I can reproduce the attached stacktrace by loading ptnetmap and attaching the interface like this:

$ cd /usr/src/ptnetmap/netmap/LINUX/
$ insmod netmap.ko
$ rmmod ixgbe
$ insmod ixgbe/ixgbe.ko
$ cd ../examples/
$ ./vale-ctl -a vale0:eth0
$ ip link set dev eth0 up

This is where the system crashes. It also happens if I start qemu with a -netdev netmap,ifname=netmap:eth0, thus directly connecting to the netmap interface, when I ip link set dev eth0 up in the guest then.

When I am using vanilla netmap, I can do all the previous steps successfully and send packages to the network with pkt-gen.

Stacktrace:

Oct 28 19:19:03 host kernel: [ 2799.120583] BUG: unable to handle kernel NULL pointer dereference at 0000000000000100
Oct 28 19:19:03 host kernel: [ 2799.124563] IP: [<ffffffffa02ab863>] ixgbe_configure_rx_ring+0x463/0x680 [ixgbe]
Oct 28 19:19:03 host kernel: [ 2799.132290] PGD 63e11067 PUD 63e12067 PMD 0 
Oct 28 19:19:03 host kernel: [ 2799.132290] Oops: 0000 [#1] SMP 
Oct 28 19:19:03 host kernel: [ 2799.132290] Modules linked in: ixgbe(OX) netmap(OX) openvswitch gre vxlan ip_tunnel libcrc32c ipmi_devintf gpio_ich dcdbas radeon coretemp kvm_intel lpc_ich kvm ttm drm_kms_helper serio_raw i5000_edac drm i2c_algo_bit edac_core i5k_amb ipmi_si shpchp lp parport mac_hid ses enclosure hid_generic usbhid dca psmouse hid ptp pata_acpi pps_core mdio megaraid_sas bnx2 [last unloaded: netmap]
Oct 28 19:19:03 host kernel: [ 2799.132290] CPU: 2 PID: 2120 Comm: vale-ctl Tainted: G           OX 3.13.0-66-generic #108-Ubuntu
Oct 28 19:19:03 host kernel: [ 2799.132290] Hardware name: Dell Inc. PowerEdge 1950/0UR033, BIOS 2.5.0 09/12/2008
Oct 28 19:19:03 host kernel: [ 2799.132290] task: ffff8800bf72c800 ti: ffff88006751a000 task.ti: ffff88006751a000
Oct 28 19:19:03 host kernel: [ 2799.132290] RIP: 0010:[<ffffffffa02ab863>]  [<ffffffffa02ab863>] ixgbe_configure_rx_ring+0x463/0x680 [ixgbe]
Oct 28 19:19:03 host kernel: [ 2799.132290] RSP: 0018:ffff88006751bae8  EFLAGS: 00010246
Oct 28 19:19:03 host kernel: [ 2799.132290] RAX: 0000000000000000 RBX: ffff8800c5566000 RCX: 0000000000000200
Oct 28 19:19:03 host kernel: [ 2799.132290] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000001ff
Oct 28 19:19:03 host kernel: [ 2799.132290] RBP: ffff88006751bb48 R08: ffffc90011755000 R09: 0000000000000000
Oct 28 19:19:03 host kernel: [ 2799.132290] R10: 0000000000000002 R11: ffff8800cab64a00 R12: ffff880036370880
Oct 28 19:19:03 host kernel: [ 2799.132290] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000100
Oct 28 19:19:03 host kernel: [ 2799.132290] FS:  00007f34f302d740(0000) GS:ffff88012fc80000(0000) knlGS:0000000000000000
Oct 28 19:19:03 host kernel: [ 2799.132290] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Oct 28 19:19:03 host kernel: [ 2799.132290] CR2: 0000000000000100 CR3: 0000000063e14000 CR4: 00000000000027e0
Oct 28 19:19:03 host kernel: [ 2799.132290] Stack:
Oct 28 19:19:03 host kernel: [ 2799.132290]  ffff880000000002 ffff8800cab64a00 ffff8800c5566000 ffff880000000002
Oct 28 19:19:03 host kernel: [ 2799.132290]  00000000cab61d80 0000000056311197 000000000005dd01 ffff880036370880
Oct 28 19:19:03 host kernel: [ 2799.132290]  ffff880036371680 0000000000000000 0000000000000001 ffff880036370ce0
Oct 28 19:19:03 host kernel: [ 2799.132290] Call Trace:
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffffa02ac613>] ixgbe_configure+0x883/0xa60 [ixgbe]
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffffa02ad658>] ixgbe_netmap_reg+0xb8/0x120 [ixgbe]
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffffa0290fcc>] netmap_hw_register+0x1c/0x30 [netmap]
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffffa0286b3d>] netmap_bwrap_register+0x6d/0x1c0 [netmap]
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffffa02930b7>] netmap_do_regif+0x2f7/0x310 [netmap]
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffff811a3099>] ? __kmalloc+0x1e9/0x230
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffffa02879dc>] netmap_bwrap_bdg_ctl+0x1ac/0x2d0 [netmap]
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffffa028a112>] netmap_bdg_ctl+0x3f2/0x5b0 [netmap]
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffffa02942ea>] netmap_ioctl+0x4aa/0x780 [netmap]
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffff81176789>] ? __do_fault+0x429/0x530
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffffa029535b>] linux_netmap_ioctl+0xab/0x140 [netmap]
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffff81730234>] ? __do_page_fault+0x204/0x570
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffff811d16a0>] do_vfs_ioctl+0x2e0/0x4c0
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffff811ce2b2>] ? final_putname+0x22/0x50
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffff811d1901>] SyS_ioctl+0x81/0xa0
Oct 28 19:19:03 host kernel: [ 2799.132290]  [<ffffffff81734c5d>] system_call_fastpath+0x1a/0x1f
Oct 28 19:19:03 host kernel: [ 2799.132290] Code: 44 03 4a 24 8b 4a 20 44 89 ca 0f 88 c0 00 00 00 45 89 c8 41 29 c8 44 39 c9 41 0f 4e d0 48 63 d2 4c 8b 83 00 01 00 00 48 c1 e2 04 <41> 8b 14 17 39 93 08 01 00 00 76 a1 48 c1 e2 04 49 8b 4c 10 08 
Oct 28 19:19:03 host kernel: [ 2799.132290] RIP  [<ffffffffa02ab863>] ixgbe_configure_rx_ring+0x463/0x680 [ixgbe]
Oct 28 19:19:03 host kernel: [ 2799.132290]  RSP <ffff88006751bae8>
Oct 28 19:19:03 host kernel: [ 2799.132290] CR2: 0000000000000100
Oct 28 19:19:03 host kernel: [ 2799.548088] ---[ end trace 0830df42049f48c5 ]---

performance issue with ptnetmap guest

Hi Stefano

I have some issues while installing ptnetmap . I followed these steps for installation :-
git clone ptnetmap and git submodule update --init —recursive.

In host machine :-

3.17 kernel version installed
Intel network interface card 10G 2P X520 Adapter

NETMAP configuration on host :
./configure --kernel-dir=../kernel-host/ --enable-ptnetmap-host
make -j
insmod netmap.ko
QEMU configuration :
./configure --target-list=x86_64-softmmu --enable-e1000-paravirt --enable-netmap --enable-ptnetmap --extra-cflags=-I$HOME/repos/ptnetmap/netmap/sys --python=python2
make -j

for creating VM on Host machine i used command:

root@prateek:# qemu-system-x86_64 -enable-kvm -smp 4 -m 4G -drive file=/netmap/vm_image/test.qcow2 -device virtio-net-pci,netdev=mynet -netdev netmap,ifname=vale0:4,passthrough=on,id=mynet -vnc :4 &
[1] 11349
root@prateek:# ptnetmap_memdev: init
383.960670 net_init_netmap [726] ptnetmap required
384.024508 net_init_netmap [751] cfg: tx 1024_1 rx 1024_1
ptnetmap_memdev: creating
ptnetmap_memdev: loading
ptnentmap_memdev: map BAR size 4000000 (64 MiB)
ptnetmap_memdev: loaded
ptnetmap_memdev: created

NETMAP guest (netmap/LINUX):

In Guest i used ptnetmap linux version.

./configure --kernel-dir=/home/ptnetmap/linux/ --enable-ptnetmap-guest --drivers=virtio-net
make -j

I loaded netmap by insmod ./netmap.ko
then modprobe virtio_net

ISSUE:-

When I run ./pkt-gen -i eth0 -f tx i got very less negligible sending rate find attachemnet of result snapshot.
I want vale switch ports to bridge with netmap:eth interface its give segmentation fault .
dmesg log :-
[91321.594584] 172.469733 [1147] netmap_get_pt_host_na not a ptnetmap
[91321.613409] 172.488572 [1993] netmap_do_regif lut ffffc90021dc9000 bufs 20482 size 2048
[91321.620769] 172.495940 [1147] netmap_get_pt_host_na not a ptnetmap
[91321.639296] 172.514481 [1993] netmap_do_regif lut ffffc90021e1f000 bufs 20482 size 2048
[91325.643884] bridge[11253]: segfault at 18 ip 00000000004028e2 sp 00007fff6c82b878 error 4 in bridge[400000+4000]
While attaching intel network interface card to vale switch whole system crash . I got the error by vale-ctl -a vale0:eth4 (find attachement of call trace snapshot)

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