My PHY is drunk, send help. https://pastebin.com/Kbrnecj4 https://pastebin.com/FdX1pVTD I would think it's some kind of clocking issue between the PHY and the MAC (the MAC seems to receive the corrupted data and get confused too)... but it's only happening on the RX side. TX is fine.
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Removed what I thought was dead code to simplify the driver code (there are multiple SKB receive paths in the "upstream" code to support old Linux versions that don't have e.g. GRO), problem fixed. That was easy. I hate not understanding the fix, but whatever.
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It's probably the 5th time I mention this feature, but NixOS is just amazing sometimes: $ nix-build '<nixpkgs>' -A pkgsCross.aarch64-multiplatform.pkgsStatic.iperf $ file result/bin/iperf3 ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), statically linked, not stripped
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[SUM] 0.00-10.00 sec 574 MBytes 482 Mbits/sec receiver [ 5] 0.00-10.00 sec 1.10 GBytes 942 Mbits/sec sender RX performance isn't great, but... good enough for now.
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