Not sure if this is a known issue or if I'm doing something wrong, but
when I tried to load an xdp program in native mode, my server starts
randomly dropping packets while there are no issues with generic mode.
bpf_set_link_xdp_fd(ifindex, fd, XDP_FLAGS_DRV_MODE); // drops packets
bpf_set_link_xdp_fd(ifindex, fd, XDP_FLAGS_SKB_MODE); // doesn't drop packets
Guest
5.0.0-16-generic #17~18.04.1-Ubuntu SMP Mon May 20 14:00:27 UTC 2019
x86_64 x86_64 x86_64 GNU/Linux
00:03.0 Ethernet controller: Red Hat, Inc. Virtio network device
Subsystem: Red Hat, Inc. Virtio network device
Physical Slot: 3
Flags: bus master, fast devsel, latency 0, IRQ 10
I/O ports at c000 [size=64]
Memory at febf1000 (32-bit, non-prefetchable) [size=4K]
Memory at fe000000 (64-bit, prefetchable) [size=16K]
Capabilities: [98] MSI-X: Enable+ Count=18 Masked-
Capabilities: [84] Vendor Specific Information: VirtIO: <unknown>
Capabilities: [70] Vendor Specific Information: VirtIO: Notify
Capabilities: [60] Vendor Specific Information: VirtIO: DeviceCfg
Capabilities: [50] Vendor Specific Information: VirtIO: ISR
Capabilities: [40] Vendor Specific Information: VirtIO: CommonCfg
Kernel driver in use: virtio-pci
Host
Unknown. It is a server from vultr.com
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