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Differential D22312

storvsc: port a Linux patch, properly set residual data length on errors
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Authored by avg on Nov 11 2019, 1:23 PM.
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sepherosa_gmail.com
decui_microsoft.com
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rS356730: storvsc: port a Linux patch, properly set residual data length on errors
Summary

This change is based on Linux commit 40630f462824ee.
csio.resid should account for transfer_len only for success and
SRB_STATUS_DATA_OVERRUN condition.

I am not sure how exactly this change works, but I have a report from a user
that they see lots of checksum errors when running a pool scrub concurrently
with iozone -l 1 -s 100G. After applying this patch the problem cannot be
reproduced.

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rS FreeBSD src repository - subversion
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Buildable 27440
Build 25678: arc lint + arc unit

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sys/
dev/
hyperv/
storvsc/
6 lines

Diff 64169

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sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c

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