mvebu: enable coherent crypto on armada 37x0

[abajk]

Armada 37xx has coherent bus, similar to Armada 7k/8k. Cache synchronization consumes a lot of CPU cycles. Enabling coherent DMA increases IOPS performance up to 4 times. Some numbers:

					Data length
Algo		MB	   16	  64	 128	 256	1024	1424	4096
DES-ECB		1	+21 %	+5 %	+5 %	+7 %	+7 %	+3 %	+20 %
AES-ECB-128	1	+21 %	+6 %	+6 %	+6 %	+9 %	+8 %	+22 %
AES-CBC-128	1	+21 %	+5 %	+5 %	+5 %	+6 %	+7 %	+23 %
AES-CBC-256	1	+23 %	+7 %	+8 %	+6 %	+11 %	+13 %	+20 %

					Data length
Algo		MB	    16	    64	   256	  512	  1024	 1420	 4096	 8192
AES-GCM-128	1	 +44 %	 +42 %	 +31 %	 +32 %	 +27 %	+30 %	+32 %	+30 %
AES-GCM-128	8	+319 %	+326 %	+163 %	+148 %	 +75 %	+72 %	+74 %	+41 %
AES-GCM-128	4k	+123 %	+128 %	 +90 %	 +83 %	+116 %	+59 %	+38 %	+28 %

					Data length
Algo		MB	   16	   64	  256	 1024	 2048	 4096	 8192
MD5			1	+21 %	+15 %	+29 %	+25 %	+50 %	+16 %	+20 %
SHA1		1	+24 %	+22 %	+27 %	+22 %	+18 %	+20 %	+20 %
SHA256		1	+30 %	+24 %	+25 %	+26 %	+21 %	+41 %	+19 %
SHA512		1	 +4 %	 +3 %	 +8 %	+10 %	+24 %	+10 %	+11 %

Tested on Armada 3720. Platform passes testmgr selftests.

Signed-off-by: Aleksander Jan Bajkowski olek2@wp.pl

[openwrt-ai]

Reviewed 1 new commit. The patch adds the upstream dma-coherent property to the EIP97 node for both 6.12 and 6.18; hunk context and line numbers (440 for 6.12, 438 for 6.18) match the respective kernel armada-37xx.dtsi, and the commit message matches the change. One filename nit inline.

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Generated by Claude Code

[openwrt-ai]

Reviewed the new revision; no new issues found. The only change since the last review is renaming both patches from the 350- prefix to 340-, which resolves the earlier prefix-collision nit. The 340- prefix is unused in both patches-6.12/ and patches-6.18/ (existing DTS patches run 320–326), and the patch contents are unchanged.

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Generated by Claude Code

[robimarko]

Thanks! Rebased on top of main and merged!