Re: [PATCH v4] ixgbe: let the xdpdrv work with more than 64 cpus
From: Eric Dumazet <hidden>
Date: 2021-08-26 18:19:45
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On 8/26/21 10:03 AM, Jason Xing wrote:
Honestly, I'm a little confused right now. @nr_cpu_ids is the fixed number which means the total number of cpus the machine has. I think, using @nr_cpu_ids is safe one way or the other regardless of whether the cpu goes offline or not. What do you think?
More exactly, nr_cpu_ids is the max number cpu id can reach,
even in presence of holes.
I think that most/many num_online_cpus() in drivers/net are simply broken
and should be replaced by nr_cpu_ids.
The assumptions of cpus being nicely numbered from [0 to X-1],
with X==num_online_cpus() is wrong.
Same remark for num_possible_cpus(), see commit
88d4f0db7fa8 ("perf: Fix alloc_callchain_buffers()") for reference.