Suppose I write some LKM with networking (netfilter) activity and I need to do some tampering with skb including skb_pull(). So I have to take care about is skb linear or not before pulling.
If I generally don't want to have an opportunity to face with non-linear (paged) skb in my system, how can I do this?
In other words: how can I disable producing paged skbs in Linux kernel?
Is there some option on network interfaces to be set up with ethtool or something else?
How can I disable producing paged (non-linear) skb's in Linux kernel?
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I think you can refer to the implementation of bpf_skb_pull_data in the kernel, this bpf helper function can pull no-linear data into linear.
https://man7.org/linux/man-pages/man7/bpf-helpers.7.html