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The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)
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Alex Elder c2dc533a7e net: ipa: properly limit modem routing table use 
[ Upstream commit cf412ec333 ]

IPA can route packets between IPA-connected entities.  The AP and
modem are currently the only such entities supported, and no routing
is required to transfer packets between them.

The number of entries in each routing table is fixed, and defined at
initialization time.  Some of these entries are designated for use
by the modem, and the rest are available for the AP to use.  The AP
sends a QMI message to the modem which describes (among other
things) information about routing table memory available for the
modem to use.

Currently the QMI initialization packet gives wrong information in
its description of routing tables.  What *should* be supplied is the
maximum index that the modem can use for the routing table memory
located at a given location.  The current code instead supplies the
total *number* of routing table entries.  Furthermore, the modem is
granted the entire table, not just the subset it's supposed to use.

This patch fixes this.  First, the ipa_mem_bounds structure is
generalized so its "end" field can be interpreted either as a final
byte offset, or a final array index.  Second, the IPv4 and IPv6
(non-hashed and hashed) table information fields in the QMI
ipa_init_modem_driver_req structure are changed to be ipa_mem_bounds
rather than ipa_mem_array structures.  Third, we set the "end" value
for each routing table to be the last index, rather than setting the
"count" to be the number of indices.  Finally, instead of allowing
the modem to use all of a routing table's memory, it is limited to
just the portion meant to be used by the modem.  In all versions of
IPA currently supported, that is IPA_ROUTE_MODEM_COUNT (8) entries.

Update a few comments for clarity.

Fixes: 530f9216a9 ("soc: qcom: ipa: AP/modem communications")
Signed-off-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/20220913204602.1803004-1-elder@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2022-09-28 11:11:50 +02:00
Documentation Input: iforce - add support for Boeder Force Feedback Wheel 2022-09-20 12:39:45 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
arch um: fix default console kernel parameter 2022-09-28 11:11:49 +02:00
block block: blk_queue_enter() / __bio_queue_enter() must return -EAGAIN for nowait 2022-09-23 14:15:48 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto KEYS: asymmetric: enforce SM2 signature use pkey algo 2022-08-17 14:24:28 +02:00
drivers net: ipa: properly limit modem routing table use 2022-09-28 11:11:50 +02:00
fs xfs: validate inode fork size against fork format 2022-09-28 11:11:45 +02:00
include net: bonding: Share lacpdu_mcast_addr definition 2022-09-28 11:11:48 +02:00
init stack: Declare {randomize_,}kstack_offset to fix Sparse warnings 2022-08-17 14:23:10 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-09 10:23:10 +02:00
kernel cgroup: Add missing cpus_read_lock() to cgroup_attach_task_all() 2022-09-23 14:15:52 +02:00
lib crypto: lib - remove unneeded selection of XOR_BLOCKS 2022-09-05 10:30:03 +02:00
mm mm: slub: fix flush_cpu_slab()/__free_slab() invocations in task context. 2022-09-28 11:11:44 +02:00
net net: core: fix flow symmetric hash 2022-09-28 11:11:47 +02:00
samples samples/landlock: Format with clang-format 2022-06-09 10:23:23 +02:00
scripts mksysmap: Fix the mismatch of 'L0' symbols in System.map 2022-09-23 14:15:51 +02:00
security apparmor: Fix memleak in aa_simple_write_to_buffer() 2022-08-25 11:40:01 +02:00
sound ALSA: hda/realtek: Enable 4-speaker output Dell Precision 5530 laptop 2022-09-28 11:11:42 +02:00
tools tools/include/uapi: Fix <asm/errno.h> for parisc and xtensa 2022-09-23 14:15:49 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: SEV: add cache flush to solve SEV cache incoherency issues 2022-09-23 14:15:52 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Input: goodix - add a goodix.h header file 2022-07-12 16:34:51 +02:00
Makefile Linux 5.15.70 2022-09-23 14:15:52 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.