selftests/net: Add test/benchmark for removing MKTs

Sample output:
> 1..36
> # 1106[lib/setup.c:207] rand seed 1660754406
> TAP version 13
> ok 1   Worst case connect       512 keys: min=0ms max=1ms mean=0.583329ms stddev=0.076376
> ok 2 Connect random-search      512 keys: min=0ms max=1ms mean=0.53412ms stddev=0.0516779
> ok 3    Worst case delete       512 keys: min=2ms max=11ms mean=6.04139ms stddev=0.245792
> ok 4        Add a new key       512 keys: min=0ms max=13ms mean=0.673415ms stddev=0.0820618
> ok 5 Remove random-search       512 keys: min=5ms max=9ms mean=6.65969ms stddev=0.258064
> ok 6         Remove async       512 keys: min=0ms max=0ms mean=0.041825ms stddev=0.0204512
> ok 7   Worst case connect       1024 keys: min=0ms max=2ms mean=0.520357ms stddev=0.0721358
> ok 8 Connect random-search      1024 keys: min=0ms max=2ms mean=0.535312ms stddev=0.0517355
> ok 9    Worst case delete       1024 keys: min=5ms max=9ms mean=8.27219ms stddev=0.287614
> ok 10        Add a new key      1024 keys: min=0ms max=1ms mean=0.688121ms stddev=0.0829531
> ok 11 Remove random-search      1024 keys: min=5ms max=9ms mean=8.37649ms stddev=0.289422
> ok 12         Remove async      1024 keys: min=0ms max=0ms mean=0.0457096ms stddev=0.0213798
> ok 13   Worst case connect      2048 keys: min=0ms max=2ms mean=0.748804ms stddev=0.0865335
> ok 14 Connect random-search     2048 keys: min=0ms max=2ms mean=0.782993ms stddev=0.0625697
> ok 15    Worst case delete      2048 keys: min=5ms max=10ms mean=8.23106ms stddev=0.286898
> ok 16        Add a new key      2048 keys: min=0ms max=1ms mean=0.812988ms stddev=0.0901658
> ok 17 Remove random-search      2048 keys: min=8ms max=9ms mean=8.84949ms stddev=0.297481
> ok 18         Remove async      2048 keys: min=0ms max=0ms mean=0.0297223ms stddev=0.0172402
> ok 19   Worst case connect      4096 keys: min=1ms max=5ms mean=1.53352ms stddev=0.123836
> ok 20 Connect random-search     4096 keys: min=1ms max=5ms mean=1.52226ms stddev=0.0872429
> ok 21    Worst case delete      4096 keys: min=5ms max=9ms mean=8.25874ms stddev=0.28738
> ok 22        Add a new key      4096 keys: min=0ms max=3ms mean=1.67382ms stddev=0.129376
> ok 23 Remove random-search      4096 keys: min=5ms max=10ms mean=8.26178ms stddev=0.287433
> ok 24         Remove async      4096 keys: min=0ms max=0ms mean=0.0340009ms stddev=0.0184393
> ok 25   Worst case connect      8192 keys: min=2ms max=4ms mean=2.86208ms stddev=0.169177
> ok 26 Connect random-search     8192 keys: min=2ms max=4ms mean=2.87592ms stddev=0.119915
> ok 27    Worst case delete      8192 keys: min=6ms max=11ms mean=7.55291ms stddev=0.274826
> ok 28        Add a new key      8192 keys: min=1ms max=5ms mean=2.56797ms stddev=0.160249
> ok 29 Remove random-search      8192 keys: min=5ms max=10ms mean=7.14002ms stddev=0.267208
> ok 30         Remove async      8192 keys: min=0ms max=0ms mean=0.0320066ms stddev=0.0178904
> ok 31   Worst case connect      16384 keys: min=5ms max=6ms mean=5.55334ms stddev=0.235655
> ok 32 Connect random-search     16384 keys: min=5ms max=6ms mean=5.52614ms stddev=0.166225
> ok 33    Worst case delete      16384 keys: min=5ms max=11ms mean=7.39109ms stddev=0.271866
> ok 34        Add a new key      16384 keys: min=2ms max=4ms mean=3.35799ms stddev=0.183248
> ok 35 Remove random-search      16384 keys: min=5ms max=8ms mean=6.86078ms stddev=0.261931
> ok 36         Remove async      16384 keys: min=0ms max=0ms mean=0.0302384ms stddev=0.0173892
> # Totals: pass:36 fail:0 xfail:0 xpass:0 skip:0 error:0

>From the output it's visible that the current simplified approach with
linked-list of MKTs scales quite fine even for thousands of keys.
And that also means that the majority of the time for delete is eaten by
synchronize_rcu() [which I can confirm separately by tracing].

Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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