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atl1c: add 4 RX/TX queue support for Mikrotik 10/25G NIC

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More RX/TX queues on a network card help spread the CPU load among
cores and achieve higher overall networking performance. The new
Mikrotik 10/25G NIC supports 4 RX and 4 TX queues. TX queues are
treated with equal priority. RX queue balancing is fixed based on
L2/L3/L4 hash.

This adds support for 4 RX/TX queues while maintaining backwards
compatibility with older hardware.

Simultaneous TX + RX performance on AMD Threadripper 3960X
with Mikrotik 10/25G NIC improved from 1.6Mpps to 3.2Mpps per port.

Backwards compatiblitiy was verified with AR8151 and AR8131 based
NICs.

Signed-off-by: Gatis Peisenieks <gatis@mikrotik.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Gatis Peisenieks 2021-05-27 17:44:23 +03:00 • committed by Jakub Kicinski
commit 057f4af2b1
3 changed files with 291 additions and 158 deletions
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