ad72d5be86
Many size / length parameters in NVMe are "0's based", meaning, a value of 0x0 represents 1, 0x1 represents 2, etc.. While this leads to an efficient encoding, it can lead to subtle bugs. With respect to queues, these parameters include: - Maximum number of queue entries - Maximum number of queues - Number of Completion Queues - Number of Submission Queues To be consistent, convert all 0's based values from the host to 1's based value internally. Likewise, covert internal 1's based values to 0's based values when returned to the host. This fixes an off-by-one bug when creating IO queues and simplifies some of the code. Note that this bug is masked by another bug. While in the neighborhood, - fix an erroneous queue ID check (checking CQ count when deleting SQ) - check for queue ID of 0x0 in a few places where this is illegal - clean up the Set Features, Number of Queues command and check for illegal values Reviewed by: imp, araujo Approved by: imp (mentor) MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D18702
FreeBSD Source:
This is the top level of the FreeBSD source directory. This file
was last revised on:
FreeBSD
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html, and https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig.html for more information, including setting make(1) variables.
Source Roadmap:
bin System/user commands.
cddl Various commands and libraries under the Common Development
and Distribution License.
contrib Packages contributed by 3rd parties.
crypto Cryptography stuff (see crypto/README).
etc Template files for /etc.
gnu Various commands and libraries under the GNU Public License.
Please see gnu/COPYING* for more information.
include System include files.
kerberos5 Kerberos5 (Heimdal) package.
lib System libraries.
libexec System daemons.
release Release building Makefile & associated tools.
rescue Build system for statically linked /rescue utilities.
sbin System commands.
secure Cryptographic libraries and commands.
share Shared resources.
stand Boot loader sources.
sys Kernel sources.
sys/<arch>/conf Kernel configuration files. GENERIC is the configuration
used in release builds. NOTES contains documentation of
all possible entries.
tests Regression tests which can be run by Kyua. See tests/README
for additional information.
tools Utilities for regression testing and miscellaneous tasks.
usr.bin User commands.
usr.sbin System administration commands.
For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see:
https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/current-stable.html