use bpf global for netdev_max_backlog as ksym changes in 6.9 #88
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net_buffer_tuner.so was failing to load BTF due to a failure to find netdev_max_backlog ksym. netdev_max_backlog was an int prior to 6.9 then it got added to a netdev hotpath struct; rather than using it in calculations retrieve the sysctl value and set a bpf global for use in bpf prog context; update it in userspace when we bump sysctl value. Reported-by: HippieMitch <https://github.com/HippieMitch> Signed-off-by: Alan Maguire <[email protected]>
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net_buffer_tuner.so was failing to load BTF due to a failure to find netdev_max_backlog ksym.
netdev_max_backlog was an int prior to 6.9 then it got added to a netdev hotpath struct; rather than using it in calculations retrieve the sysctl value and set a bpf global for use in bpf prog context; update it in userspace when we bump sysctl value.
Reported-by: HippieMitch https://github.com/HippieMitch