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From: lgy <lgy.bupt@gmail.com>
Date: Fri, 1 Jul 2016 16:18:32 -0700
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Subject: [dpdk-users] Using ivshmem
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X-List-Received-Date: Fri, 01 Jul 2016 23:18:34 -0000

Hi,

I'm trying to use IVSHEMEM library to forward packets between two VMs and
I'm using pci-passthrough to avoid involving host.

I run l2fwd-ivshmem host.c example code to generate ivshmem metadata on the
host, then I pass the metadata and hugepages into VM using patched qemu.

In the VM, I modify l2fwd-ivshmem guest.c code to lookup shared mbuf pool
and receive packets from NIC port directly. However, I dump mbuf and the
pktlen is right but all packets data are 0. I am not sure why NIC can't
write into packet data.

Below is the command I use:
sudo ./qemu-mem -enable-kvm -cpu host -smp 12,sockets=2,cores=6,threads=1
-m 4096 -mem-path /dev/hugepages -mem-prealloc -hda test-vm/vm.qcow2
-device e1000,netdev=tap0,mac=0a:0b:0c:11:12:13 -netdev tap,id=tap0 -device
vfio-pci,host=0000:03:00.0 -device
ivshmem,size=32M,shm=fd:/dev/hugepages/rtemap_3:0x2c00000:0x1600000:/dev/hugepages/rtemap_6:0x0:0x200000:/dev/zero:0x0:0x7fc000:/var/run/.dpdk_ivshmem_metadata_l2fwd_ivshmem:0x0:0x4000

Thanks!