https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=245463
Bug ID: 245463
Summary: Driver sysctl tunables that use strings fail with
error 14
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: jeffrey.e.pie...@intel.com
When changing driver tunables that use strings with kenv, they fail with error
14. For example Intel drivers rx/tx descriptor tunables fail with:
Setting sysctl dev.ixl.0.iflib.override_ntxds failed: 14
Setting sysctl dev.ixl.0.iflib.override_nrxds failed: 14
More than likely this is caused by https://reviews.freebsd.org/D23378. This
patch has made changes to the sysctl_handle_string() function. The copyin()
function is now used to copy bytes from user space to kernel space. The
problem is that the tunables are already located in the kernel space (kenv). It
turns out that changing string parameters using sysctl works well, but if you
set string parameters from kenv, the copyin() function fails with error 14.
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