I finally managed to get the tcrypt module working to make some measurements straight from the kernel. The reason the module was not loading was that AES-XTS was hanging, so the tests never finished, and I couldn't get any messages on /proc/kmsg. By trial and error, I concluded that xts-aes-qce does not take requests that are greater than 512-bytes, and not a multiple of 512. So, when I tried to run the tests with 768 bytes, it would just hang. As a workaround we can use the fallback to fullfill those requests. As part of the v2, I'm using a module paramenter to set the software threshold, instead of fixing it at 512. The results of the tcrypt tests confirmed my previous estimates, so I'm leaving the default at 512 bytes. Here's a sample run of my tests. Just like with openssl, numbers vary from run to run, more than I would expect. testing speed of async cbc(aes) (cbc-aes-qce) encryption aes_sw_max_len 32.768 512 0 ------------------ ---------- ---------- ---------- 128 bit 16 bytes 8.081.136 5.614.448 430.416 128 bit 64 bytes 13.152.768 13.205.952 1.745.088 128 bit 256 bytes 16.094.464 16.101.120 6.969.600 128 bit 512 bytes 16.701.440 16.705.024 12.866.048 128 bit 768 bytes 16.883.712 13.192.704 15.186.432 128 bit 1024 bytes 17.036.288 17.149.952 19.716.096 128 bit 2048 bytes 17.108.992 30.842.880 32.868.352 128 bit 4096 bytes 17.203.200 44.929.024 49.655.808 128 bit 8192 bytes 17.219.584 58.966.016 74.186.752 256 bit 16 bytes 6.962.432 1.943.616 419.088 256 bit 64 bytes 10.485.568 10.421.952 1.681.536 256 bit 256 bytes 12.211.712 12.160.000 6.701.312 256 bit 512 bytes 12.499.456 12.584.448 9.882.112 256 bit 768 bytes 12.622.080 12.550.656 14.701.824 256 bit 1024 bytes 12.750.848 16.079.872 19.585.024 256 bit 2048 bytes 12.812.288 28.293.120 27.693.056 256 bit 4096 bytes 12.939.264 34.234.368 44.142.592 256 bit 8192 bytes 12.845.056 50.274.304 63.520.768 Eneas U de Queiroz (3): crypto: qce - use cryptlen when adding extra sgl crypto: qce - use AES fallback for small requests crypto: qce - handle AES-XTS cases that qce fails drivers/crypto/Kconfig | 23 +++++++++++++++++++++++ drivers/crypto/qce/common.c | 2 -- drivers/crypto/qce/common.h | 3 +++ drivers/crypto/qce/dma.c | 11 ++++++----- drivers/crypto/qce/dma.h | 2 +- drivers/crypto/qce/skcipher.c | 28 ++++++++++++++++++---------- 6 files changed, 51 insertions(+), 18 deletions(-)
