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According to Documentation/core-api/printk-formats.rst,
Use the correct print format. Printing an unsigned int value should use %u
instead of %d. Otherwise printk() might end up displaying negative numbers.
Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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According to Documentation/core-api/printk-formats.rst,
Use the correct print format. Printing an unsigned int value should use %u
instead of %d. Otherwise printk() might end up displaying negative numbers.
Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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According to Documentation/core-api/printk-formats.rst,
Use the correct print format. Printing an unsigned int value should use %u
instead of %d. Otherwise printk() might end up displaying negative numbers.
Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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According to Documentation/core-api/printk-formats.rst,
Use the correct print format. Printing an unsigned int value should use %u
instead of %d. Otherwise printk() might end up displaying negative numbers.
Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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According to Documentation/core-api/printk-formats.rst,
Use the correct print format. Printing an unsigned int value should use %u
instead of %d. Otherwise printk() might end up displaying negative numbers.
Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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According to Documentation/core-api/printk-formats.rst,
Use the correct print format. Printing an unsigned int value should use %u
instead of %d. Otherwise printk() might end up displaying negative numbers.
Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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According to Documentation/core-api/printk-formats.rst,
Use the correct print format. Printing an unsigned int value should use %u
instead of %d. Otherwise printk() might end up displaying negative numbers.
Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This patch replaces some non-inclusive terms based on the appropriate
language mapping table compiled by the Bluetooth SIG:
https://specificationrefs.bluetooth.com/language-mapping/Appropriate_Language_Mapping_Table.pdf
Specifically, these terms are replaced:
slave -> peripheral
blacklisted -> blocked
Signed-off-by: Archie Pusaka <apusaka@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This patch replaces some non-inclusive terms based on the appropriate
language mapping table compiled by the Bluetooth SIG:
https://specificationrefs.bluetooth.com/language-mapping/Appropriate_Language_Mapping_Table.pdf
Specifically, these terms are replaced:
master -> initiator
slave -> responder
Signed-off-by: Archie Pusaka <apusaka@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This patch replaces some non-inclusive terms based on the appropriate
language mapping table compiled by the Bluetooth SIG:
https://specificationrefs.bluetooth.com/language-mapping/Appropriate_Language_Mapping_Table.pdf
Specifically, these terms are replaced:
master -> central
slave -> peripheral
Signed-off-by: Archie Pusaka <apusaka@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This patch replaces some non-inclusive terms based on the appropriate
language mapping table compiled by the Bluetooth SIG:
https://specificationrefs.bluetooth.com/language-mapping/Appropriate_Language_Mapping_Table.pdf
Specifically, these terms are replaced when describing the
connectionless peripheral broadcast feature:
master -> central
slave -> peripheral
Signed-off-by: Archie Pusaka <apusaka@chromium.org>
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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This fixes parsing of LTV entries when the length is 0.
Found with:
tools/mgmt-tester -s "Add Advertising - Success (ScRsp only)"
Add Advertising - Success (ScRsp only) - run
Sending Add Advertising (0x003e)
Test condition added, total 1
[ 11.004577] ==================================================================
[ 11.005292] BUG: KASAN: slab-out-of-bounds in tlv_data_is_valid+0x87/0xe0
[ 11.005984] Read of size 1 at addr ffff888002c695b0 by task mgmt-tester/87
[ 11.006711]
[ 11.007176]
[ 11.007429] Allocated by task 87:
[ 11.008151]
[ 11.008438] The buggy address belongs to the object at ffff888002c69580
[ 11.008438] which belongs to the cache kmalloc-64 of size 64
[ 11.010526] The buggy address is located 48 bytes inside of
[ 11.010526] 64-byte region [ffff888002c69580, ffff888002c695c0)
[ 11.012423] The buggy address belongs to the page:
[ 11.013291]
[ 11.013544] Memory state around the buggy address:
[ 11.014359] ffff888002c69480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[ 11.015453] ffff888002c69500: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[ 11.016232] >ffff888002c69580: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
[ 11.017010] ^
[ 11.017547] ffff888002c69600: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
[ 11.018296] ffff888002c69680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[ 11.019116] ==================================================================
Fixes: 2bb36870e8cb2 ("Bluetooth: Unify advertising instance flags check")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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When the Get Device Flags command fails, it returns the error status
with the parameters filled with the garbage values. Although the
parameters are not used, it is better to fill with zero than the random
values.
Signed-off-by: Tedd Ho-Jeong An <tedd.an@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Disable duplicates filter when scanning for advertisement monitor for
the following reasons. The scanning includes active scan and passive
scan.
For HW pattern filtering (ex. MSFT), Realtek and Qualcomm controllers
ignore RSSI_Sampling_Period when the duplicates filter is enabled.
For SW pattern filtering, when we're not doing interleaved scanning, it
is necessary to disable duplicates filter, otherwise hosts can only
receive one advertisement and it's impossible to know if a peer is still
in range.
Signed-off-by: Yun-Hao Chung <howardchung@chromium.org>
Reviewed-by: Archie Pusaka <apusaka@chromium.org>
Reviewed-by: Manish Mandlik <mmandlik@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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When using controller based address resolution, then the destination
address type during le_conn_complete uses 0x02 & 0x03 if controller
resolves the destination address(RPA).
These address types need to be converted back into either 0x00 0r 0x01
Signed-off-by: Sathish Narasimman <sathish.narasimman@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Use DEVICE_ATTR_RO helper instead of plain DEVICE_ATTR,
which makes the code a bit shorter and easier to read.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The use of l2cap_chan_del is not safe under a loop using
list_for_each_entry.
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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The use of l2cap_chan_del is not safe under a loop using
list_for_each_entry.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Even with rate limited reporting this is very spammy and since
it is remote device that is providing bogus data there is no
need to report this as error.
Since real_len variable was used only to allow conditional error
message it is now also removed.
[72454.143336] bt_err_ratelimited: 10 callbacks suppressed
[72454.143337] Bluetooth: hci0: advertising data len corrected
[72454.296314] Bluetooth: hci0: advertising data len corrected
[72454.892329] Bluetooth: hci0: advertising data len corrected
[72455.051319] Bluetooth: hci0: advertising data len corrected
[72455.357326] Bluetooth: hci0: advertising data len corrected
[72455.663295] Bluetooth: hci0: advertising data len corrected
[72455.787278] Bluetooth: hci0: advertising data len corrected
[72455.942278] Bluetooth: hci0: advertising data len corrected
[72456.094276] Bluetooth: hci0: advertising data len corrected
[72456.249137] Bluetooth: hci0: advertising data len corrected
[72459.416333] bt_err_ratelimited: 13 callbacks suppressed
[72459.416334] Bluetooth: hci0: advertising data len corrected
[72459.721334] Bluetooth: hci0: advertising data len corrected
[72460.011317] Bluetooth: hci0: advertising data len corrected
[72460.327171] Bluetooth: hci0: advertising data len corrected
[72460.638294] Bluetooth: hci0: advertising data len corrected
[72460.946350] Bluetooth: hci0: advertising data len corrected
[72461.225320] Bluetooth: hci0: advertising data len corrected
[72461.690322] Bluetooth: hci0: advertising data len corrected
[72462.118318] Bluetooth: hci0: advertising data len corrected
[72462.427319] Bluetooth: hci0: advertising data len corrected
[72464.546319] bt_err_ratelimited: 7 callbacks suppressed
[72464.546319] Bluetooth: hci0: advertising data len corrected
[72464.857318] Bluetooth: hci0: advertising data len corrected
[72465.163332] Bluetooth: hci0: advertising data len corrected
[72465.278331] Bluetooth: hci0: advertising data len corrected
[72465.432323] Bluetooth: hci0: advertising data len corrected
[72465.891334] Bluetooth: hci0: advertising data len corrected
[72466.045334] Bluetooth: hci0: advertising data len corrected
[72466.197321] Bluetooth: hci0: advertising data len corrected
[72466.340318] Bluetooth: hci0: advertising data len corrected
[72466.498335] Bluetooth: hci0: advertising data len corrected
[72469.803299] bt_err_ratelimited: 10 callbacks suppressed
Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=203753
Cc: stable@vger.kernel.org
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Rfkill block and unblock Intel USB Bluetooth [8087:0026] may make it
stops working:
[ 509.691509] Bluetooth: hci0: HCI reset during shutdown failed
[ 514.897584] Bluetooth: hci0: MSFT filter_enable is already on
[ 530.044751] usb 3-10: reset full-speed USB device number 5 using xhci_hcd
[ 545.660350] usb 3-10: device descriptor read/64, error -110
[ 561.283530] usb 3-10: device descriptor read/64, error -110
[ 561.519682] usb 3-10: reset full-speed USB device number 5 using xhci_hcd
[ 566.686650] Bluetooth: hci0: unexpected event for opcode 0x0500
[ 568.752452] Bluetooth: hci0: urb 0000000096cd309b failed to resubmit (113)
[ 578.797955] Bluetooth: hci0: Failed to read MSFT supported features (-110)
[ 586.286565] Bluetooth: hci0: urb 00000000c522f633 failed to resubmit (113)
[ 596.215302] Bluetooth: hci0: Failed to read MSFT supported features (-110)
Or kernel panics because other workqueues already freed skb:
[ 2048.663763] BUG: kernel NULL pointer dereference, address: 0000000000000000
[ 2048.663775] #PF: supervisor read access in kernel mode
[ 2048.663779] #PF: error_code(0x0000) - not-present page
[ 2048.663782] PGD 0 P4D 0
[ 2048.663787] Oops: 0000 [#1] SMP NOPTI
[ 2048.663793] CPU: 3 PID: 4491 Comm: rfkill Tainted: G W 5.13.0-rc1-next-20210510+ #20
[ 2048.663799] Hardware name: HP HP EliteBook 850 G8 Notebook PC/8846, BIOS T76 Ver. 01.01.04 12/02/2020
[ 2048.663801] RIP: 0010:__skb_ext_put+0x6/0x50
[ 2048.663814] Code: 8b 1b 48 85 db 75 db 5b 41 5c 5d c3 be 01 00 00 00 e8 de 13 c0 ff eb e7 be 02 00 00 00 e8 d2 13 c0 ff eb db 0f 1f 44 00 00 55 <8b> 07 48 89 e5 83 f8 01 74 14 b8 ff ff ff ff f0 0f c1
07 83 f8 01
[ 2048.663819] RSP: 0018:ffffc1d105b6fd80 EFLAGS: 00010286
[ 2048.663824] RAX: 0000000000000000 RBX: ffff9d9ac5649000 RCX: 0000000000000000
[ 2048.663827] RDX: ffffffffc0d1daf6 RSI: 0000000000000206 RDI: 0000000000000000
[ 2048.663830] RBP: ffffc1d105b6fd98 R08: 0000000000000001 R09: ffff9d9ace8ceac0
[ 2048.663834] R10: ffff9d9ace8ceac0 R11: 0000000000000001 R12: ffff9d9ac5649000
[ 2048.663838] R13: 0000000000000000 R14: 00007ffe0354d650 R15: 0000000000000000
[ 2048.663843] FS: 00007fe02ab19740(0000) GS:ffff9d9e5f8c0000(0000) knlGS:0000000000000000
[ 2048.663849] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2048.663853] CR2: 0000000000000000 CR3: 0000000111a52004 CR4: 0000000000770ee0
[ 2048.663856] PKRU: 55555554
[ 2048.663859] Call Trace:
[ 2048.663865] ? skb_release_head_state+0x5e/0x80
[ 2048.663873] kfree_skb+0x2f/0xb0
[ 2048.663881] btusb_shutdown_intel_new+0x36/0x60 [btusb]
[ 2048.663905] hci_dev_do_close+0x48c/0x5e0 [bluetooth]
[ 2048.663954] ? __cond_resched+0x1a/0x50
[ 2048.663962] hci_rfkill_set_block+0x56/0xa0 [bluetooth]
[ 2048.664007] rfkill_set_block+0x98/0x170
[ 2048.664016] rfkill_fop_write+0x136/0x1e0
[ 2048.664022] vfs_write+0xc7/0x260
[ 2048.664030] ksys_write+0xb1/0xe0
[ 2048.664035] ? exit_to_user_mode_prepare+0x37/0x1c0
[ 2048.664042] __x64_sys_write+0x1a/0x20
[ 2048.664048] do_syscall_64+0x40/0xb0
[ 2048.664055] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 2048.664060] RIP: 0033:0x7fe02ac23c27
[ 2048.664066] Code: 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
[ 2048.664070] RSP: 002b:00007ffe0354d638 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 2048.664075] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fe02ac23c27
[ 2048.664078] RDX: 0000000000000008 RSI: 00007ffe0354d650 RDI: 0000000000000003
[ 2048.664081] RBP: 0000000000000000 R08: 0000559b05998440 R09: 0000559b05998440
[ 2048.664084] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
[ 2048.664086] R13: 0000000000000000 R14: ffffffff00000000 R15: 00000000ffffffff
So move the shutdown callback to a place where workqueues are either
flushed or cancelled to resolve the issue.
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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For incoming SCO connection with transparent coding format, alt setting
of CVSD is getting applied instead of Transparent.
Before fix:
< HCI Command: Accept Synchron.. (0x01|0x0029) plen 21 #2196 [hci0] 321.342548
Address: 1C:CC:D6:E2:EA:80 (Xiaomi Communications Co Ltd)
Transmit bandwidth: 8000
Receive bandwidth: 8000
Max latency: 13
Setting: 0x0003
Input Coding: Linear
Input Data Format: 1's complement
Input Sample Size: 8-bit
# of bits padding at MSB: 0
Air Coding Format: Transparent Data
Retransmission effort: Optimize for link quality (0x02)
Packet type: 0x003f
HV1 may be used
HV2 may be used
HV3 may be used
EV3 may be used
EV4 may be used
EV5 may be used
> HCI Event: Command Status (0x0f) plen 4 #2197 [hci0] 321.343585
Accept Synchronous Connection Request (0x01|0x0029) ncmd 1
Status: Success (0x00)
> HCI Event: Synchronous Connect Comp.. (0x2c) plen 17 #2198 [hci0] 321.351666
Status: Success (0x00)
Handle: 257
Address: 1C:CC:D6:E2:EA:80 (Xiaomi Communications Co Ltd)
Link type: eSCO (0x02)
Transmission interval: 0x0c
Retransmission window: 0x04
RX packet length: 60
TX packet length: 60
Air mode: Transparent (0x03)
........
> SCO Data RX: Handle 257 flags 0x00 dlen 48 #2336 [hci0] 321.383655
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #2337 [hci0] 321.389558
> SCO Data RX: Handle 257 flags 0x00 dlen 48 #2338 [hci0] 321.393615
> SCO Data RX: Handle 257 flags 0x00 dlen 48 #2339 [hci0] 321.393618
> SCO Data RX: Handle 257 flags 0x00 dlen 48 #2340 [hci0] 321.393618
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #2341 [hci0] 321.397070
> SCO Data RX: Handle 257 flags 0x00 dlen 48 #2342 [hci0] 321.403622
> SCO Data RX: Handle 257 flags 0x00 dlen 48 #2343 [hci0] 321.403625
> SCO Data RX: Handle 257 flags 0x00 dlen 48 #2344 [hci0] 321.403625
> SCO Data RX: Handle 257 flags 0x00 dlen 48 #2345 [hci0] 321.403625
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #2346 [hci0] 321.404569
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #2347 [hci0] 321.412091
> SCO Data RX: Handle 257 flags 0x00 dlen 48 #2348 [hci0] 321.413626
> SCO Data RX: Handle 257 flags 0x00 dlen 48 #2349 [hci0] 321.413630
> SCO Data RX: Handle 257 flags 0x00 dlen 48 #2350 [hci0] 321.413630
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #2351 [hci0] 321.419674
After fix:
< HCI Command: Accept Synchronou.. (0x01|0x0029) plen 21 #309 [hci0] 49.439693
Address: 1C:CC:D6:E2:EA:80 (Xiaomi Communications Co Ltd)
Transmit bandwidth: 8000
Receive bandwidth: 8000
Max latency: 13
Setting: 0x0003
Input Coding: Linear
Input Data Format: 1's complement
Input Sample Size: 8-bit
# of bits padding at MSB: 0
Air Coding Format: Transparent Data
Retransmission effort: Optimize for link quality (0x02)
Packet type: 0x003f
HV1 may be used
HV2 may be used
HV3 may be used
EV3 may be used
EV4 may be used
EV5 may be used
> HCI Event: Command Status (0x0f) plen 4 #310 [hci0] 49.440308
Accept Synchronous Connection Request (0x01|0x0029) ncmd 1
Status: Success (0x00)
> HCI Event: Synchronous Connect Complete (0x2c) plen 17 #311 [hci0] 49.449308
Status: Success (0x00)
Handle: 257
Address: 1C:CC:D6:E2:EA:80 (Xiaomi Communications Co Ltd)
Link type: eSCO (0x02)
Transmission interval: 0x0c
Retransmission window: 0x04
RX packet length: 60
TX packet length: 60
Air mode: Transparent (0x03)
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #312 [hci0] 49.450421
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #313 [hci0] 49.457927
> HCI Event: Max Slots Change (0x1b) plen 3 #314 [hci0] 49.460345
Handle: 256
Max slots: 5
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #315 [hci0] 49.465453
> SCO Data RX: Handle 257 flags 0x00 dlen 60 #316 [hci0] 49.470502
> SCO Data RX: Handle 257 flags 0x00 dlen 60 #317 [hci0] 49.470519
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #318 [hci0] 49.472996
> SCO Data RX: Handle 257 flags 0x00 dlen 60 #319 [hci0] 49.480412
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #320 [hci0] 49.480492
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #321 [hci0] 49.487989
> SCO Data RX: Handle 257 flags 0x00 dlen 60 #322 [hci0] 49.490303
< SCO Data TX: Handle 257 flags 0x00 dlen 60 #323 [hci0] 49.495496
> SCO Data RX: Handle 257 flags 0x00 dlen 60 #324 [hci0] 49.500304
> SCO Data RX: Handle 257 flags 0x00 dlen 60 #325 [hci0] 49.500311
Signed-off-by: Kiran K <kiran.k@intel.com>
Signed-off-by: Lokendra Singh <lokendra.singh@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Fix the following clang warning:
net/bluetooth/6lowpan.c:913:20: warning: unused function 'bdaddr_type'
[-Wunused-function].
net/bluetooth/6lowpan.c:106:35: warning: unused function
'peer_lookup_ba' [-Wunused-function].
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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During command status or command complete event, the controller may set
ncmd=0 indicating that it is not accepting any more commands. In such a
case, host holds off sending any more commands to the controller. If the
controller doesn't recover from such condition, host will wait forever,
until the user decides that the Bluetooth is broken and may power cycles
the Bluetooth.
This patch triggers the hardware error to reset the controller and
driver when it gets into such state as there is no other wat out.
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Signed-off-by: Manish Mandlik <mmandlik@google.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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0x2B, 0x31 and 0x33 are reserved for future use but were not present in
the HCI to MGMT conversion table, this caused the conversion to be
incorrect for the HCI status code greater than 0x2A.
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Signed-off-by: Yu Liu <yudiliu@google.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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When cmtp_attach_device fails, cmtp_add_connection returns the error value
which leads to the caller to doing fput through sockfd_put. But
cmtp_session kthread, which is stopped in this path will also call fput,
leading to a potential refcount underflow or a use-after-free.
Add a refcount before we signal the kthread to stop. The kthread will try
to grab the cmtp_session_sem mutex before doing the fput, which is held
when get_file is called, so there should be no races there.
Reported-by: Ryota Shiga
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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When an MGMT_EV_DEVICE_CONNECTED event is reported back to the user
space we will set the flags to tell if the established connection is
outbound or not. This is useful for the user space to log better metrics
and error messages.
Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Reviewed-by: Alain Michaud <alainm@chromium.org>
Signed-off-by: Yu Liu <yudiliu@google.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Fix the following coccicheck warning:
net/bluetooth/msft.c:37:6-13: WARNING use flexible-array member instead
net/bluetooth/msft.c:42:6-10: WARNING use flexible-array member instead
net/bluetooth/msft.c:52:6-10: WARNING use flexible-array member instead
Signed-off-by: Qiheng Lin <linqiheng@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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Delete unneeded variable initialization.
Signed-off-by: Kai Ye <yekai13@huawei.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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When smc_sendmsg() is called before the SMC socket initialization has
completed, smc_tx_sendmsg() will access un-initialized fields of the
SMC socket which results in a null-pointer dereference.
Fix this by checking the socket state first in smc_tx_sendmsg().
Fixes: e0e4b8fa5338 ("net/smc: Add SMC statistics support")
Reported-by: syzbot+5dda108b672b54141857@syzkaller.appspotmail.com
Reviewed-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Per the kmsg document [0], if we don't specify the log level with a
prefix "<N>" in the message string, the default log level will be
applied to the message. Since the default level could be warning(4),
this would make the log utility such as journalctl treat the message,
"Started bpfilter", as a warning. To avoid confusion, this commit
adds the prefix "<5>" to make the message always a notice.
[0] https://www.kernel.org/doc/Documentation/ABI/testing/dev-kmsg
Fixes: 36c4357c63f3 ("net: bpfilter: print umh messages to /dev/kmsg")
Reported-by: Martin Loviska <mloviska@suse.com>
Signed-off-by: Gary Lin <glin@suse.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Dmitrii Banshchikov <me@ubique.spb.ru>
Link: https://lore.kernel.org/bpf/20210623040918.8683-1-glin@suse.com
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parameter dst always points to null.
Signed-off-by: zhang kai <zhangkaiheb@126.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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These is no need to wait for 'interval' period for the next probe
if the last probe is already acked in search state. The 'interval'
period waiting should be only for probe failure timeout and the
current pmtu check when it's in search complete state.
This change will shorten the probe time a lot in search state, and
also fix the document accordingly.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Currently the PLPMUTD probe will stop for a long period (interval * 30)
after it enters search complete state. If there's a pmtu change on the
route path, it takes a long time to be aware if the ICMP TooBig packet
is lost or filtered.
As it says in rfc8899#section-4.3:
"A DPLPMTUD method MUST NOT rely solely on this method."
(ICMP PTB message).
This patch is to enable the other method for search complete state:
"A PL can use the DPLPMTUD probing mechanism to periodically
generate probe packets of the size of the current PLPMTU."
With this patch, the probe will continue with the current pmtu every
'interval' until the PMTU_RAISE_TIMER 'timeout', which we implement
by adding raise_count to raise the probe size when it counts to 30
and removing the SCTP_PL_COMPLETE check for PMTU_RAISE_TIMER.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Dave observed number of machines hitting OOM on the UDP send
path. The workload seems to be sending large UDP packets over
loopback. Since loopback has MTU of 64k kernel will try to
allocate an skb with up to 64k of head space. This has a good
chance of failing under memory pressure. What's worse if
the message length is <32k the allocation may trigger an
OOM killer.
This is entirely avoidable, we can use an skb with page frags.
af_unix solves a similar problem by limiting the head
length to SKB_MAX_ALLOC. This seems like a good and simple
approach. It means that UDP messages > 16kB will now
use fragments if underlying device supports SG, if extra
allocator pressure causes regressions in real workloads
we can switch to trying the large allocation first and
falling back.
v4: pre-calculate all the additions to alloclen so
we can be sure it won't go over order-2
Reported-by: Dave Jones <dsj@fb.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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It's getting more common to run nested container environments for
testing cloud software. One of such examples is Kind [1] which runs a
Kubernetes cluster in Docker containers on a single host. Each container
acts as a Kubernetes node, and thus can run any Pod (aka container)
inside the former. This approach simplifies testing a lot, as it
eliminates complicated VM setups.
Unfortunately, such a setup breaks some functionality when cgroupv2 BPF
programs are used for load-balancing. The load-balancer BPF program
needs to detect whether a request originates from the host netns or a
container netns in order to allow some access, e.g. to a service via a
loopback IP address. Typically, the programs detect this by comparing
netns cookies with the one of the init ns via a call to
bpf_get_netns_cookie(NULL). However, in nested environments the latter
cannot be used given the Kubernetes node's netns is outside the init ns.
To fix this, we need to pass the Kubernetes node netns cookie to the
program in a different way: by extending getsockopt() with a
SO_NETNS_COOKIE option, the orchestrator which runs in the Kubernetes
node netns can retrieve the cookie and pass it to the program instead.
Thus, this is following up on Eric's commit 3d368ab87cf6 ("net:
initialize net->net_cookie at netns setup") to allow retrieval via
SO_NETNS_COOKIE. This is also in line in how we retrieve socket cookie
via SO_COOKIE.
[1] https://kind.sigs.k8s.io/
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Martynas Pumputis <m@lambda.lt>
Cc: Eric Dumazet <edumazet@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The rcu_read_lock() call in cls_bpf and act_bpf are redundant: on the TX
side, there's already a call to rcu_read_lock_bh() in __dev_queue_xmit(),
and on RX there's a covering rcu_read_lock() in
netif_receive_skb{,_list}_internal().
With the previous patches we also amended the lockdep checks in the map
code to not require any particular RCU flavour, so we can just get rid of
the rcu_read_lock()s.
Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210624160609.292325-7-toke@redhat.com
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XDP_REDIRECT works by a three-step process: the bpf_redirect() and
bpf_redirect_map() helpers will lookup the target of the redirect and store
it (along with some other metadata) in a per-CPU struct bpf_redirect_info.
Next, when the program returns the XDP_REDIRECT return code, the driver
will call xdp_do_redirect() which will use the information thus stored to
actually enqueue the frame into a bulk queue structure (that differs
slightly by map type, but shares the same principle). Finally, before
exiting its NAPI poll loop, the driver will call xdp_do_flush(), which will
flush all the different bulk queues, thus completing the redirect.
Pointers to the map entries will be kept around for this whole sequence of
steps, protected by RCU. However, there is no top-level rcu_read_lock() in
the core code; instead drivers add their own rcu_read_lock() around the XDP
portions of the code, but somewhat inconsistently as Martin discovered[0].
However, things still work because everything happens inside a single NAPI
poll sequence, which means it's between a pair of calls to
local_bh_disable()/local_bh_enable(). So Paul suggested[1] that we could
document this intention by using rcu_dereference_check() with
rcu_read_lock_bh_held() as a second parameter, thus allowing sparse and
lockdep to verify that everything is done correctly.
This patch does just that: we add an __rcu annotation to the map entry
pointers and remove the various comments explaining the NAPI poll assurance
strewn through devmap.c in favour of a longer explanation in filter.c. The
goal is to have one coherent documentation of the entire flow, and rely on
the RCU annotations as a "standard" way of communicating the flow in the
map code (which can additionally be understood by sparse and lockdep).
The RCU annotation replacements result in a fairly straight-forward
replacement where READ_ONCE() becomes rcu_dereference_check(), WRITE_ONCE()
becomes rcu_assign_pointer() and xchg() and cmpxchg() gets wrapped in the
proper constructs to cast the pointer back and forth between __rcu and
__kernel address space (for the benefit of sparse). The one complication is
that xskmap has a few constructions where double-pointers are passed back
and forth; these simply all gain __rcu annotations, and only the final
reference/dereference to the inner-most pointer gets changed.
With this, everything can be run through sparse without eliciting
complaints, and lockdep can verify correctness even without the use of
rcu_read_lock() in the drivers. Subsequent patches will clean these up from
the drivers.
[0] https://lore.kernel.org/bpf/20210415173551.7ma4slcbqeyiba2r@kafai-mbp.dhcp.thefacebook.com/
[1] https://lore.kernel.org/bpf/20210419165837.GA975577@paulmck-ThinkPad-P17-Gen-1/
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210624160609.292325-6-toke@redhat.com
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Since we no longer modify gso_size, it is now theoretically
safe to not set SKB_GSO_DODGY and reset gso_segs to zero.
This also means the skb_is_gso_tcp() check should no longer
be necessary.
Unfortunately we cannot remove the skb_{decrease,increase}_gso_size()
helpers, as they are still used elsewhere:
bpf_skb_net_grow() without BPF_F_ADJ_ROOM_FIXED_GSO
bpf_skb_net_shrink() without BPF_F_ADJ_ROOM_FIXED_GSO
net/core/lwt_bpf.c's handle_gso_type()
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Dongseok Yi <dseok.yi@samsung.com>
Cc: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/bpf/20210617000953.2787453-3-zenczykowski@gmail.com
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This is technically a backwards incompatible change in behaviour, but I'm
going to argue that it is very unlikely to break things, and likely to fix
*far* more then it breaks.
In no particular order, various reasons follow:
(a) I've long had a bug assigned to myself to debug a super rare kernel crash
on Android Pixel phones which can (per stacktrace) be traced back to BPF clat
IPv6 to IPv4 protocol conversion causing some sort of ugly failure much later
on during transmit deep in the GSO engine, AFAICT precisely because of this
change to gso_size, though I've never been able to manually reproduce it. I
believe it may be related to the particular network offload support of attached
USB ethernet dongle being used for tethering off of an IPv6-only cellular
connection. The reason might be we end up with more segments than max permitted,
or with a GSO packet with only one segment... (either way we break some
assumption and hit a BUG_ON)
(b) There is no check that the gso_size is > 20 when reducing it by 20, so we
might end up with a negative (or underflowing) gso_size or a gso_size of 0.
This can't possibly be good. Indeed this is probably somehow exploitable (or
at least can result in a kernel crash) by delivering crafted packets and perhaps
triggering an infinite loop or a divide by zero... As a reminder: gso_size (MSS)
is related to MTU, but not directly derived from it: gso_size/MSS may be
significantly smaller then one would get by deriving from local MTU. And on
some NICs (which do loose MTU checking on receive, it may even potentially be
larger, for example my work pc with 1500 MTU can receive 1520 byte frames [and
sometimes does due to bugs in a vendor plat46 implementation]). Indeed even just
going from 21 to 1 is potentially problematic because it increases the number
of segments by a factor of 21 (think DoS, or some other crash due to too many
segments).
(c) It's always safe to not increase the gso_size, because it doesn't result in
the max packet size increasing. So the skb_increase_gso_size() call was always
unnecessary for correctness (and outright undesirable, see later). As such the
only part which is potentially dangerous (ie. could cause backwards compatibility
issues) is the removal of the skb_decrease_gso_size() call.
(d) If the packets are ultimately destined to the local device, then there is
absolutely no benefit to playing around with gso_size. It only matters if the
packets will egress the device. ie. we're either forwarding, or transmitting
from the device.
(e) This logic only triggers for packets which are GSO. It does not trigger for
skbs which are not GSO. It will not convert a non-GSO MTU sized packet into a
GSO packet (and you don't even know what the MTU is, so you can't even fix it).
As such your transmit path must *already* be able to handle an MTU 20 bytes
larger then your receive path (for IPv4 to IPv6 translation) - and indeed 28
bytes larger due to IPv4 fragments. Thus removing the skb_decrease_gso_size()
call doesn't actually increase the size of the packets your transmit side must
be able to handle. ie. to handle non-GSO max-MTU packets, the IPv4/IPv6 device/
route MTUs must already be set correctly. Since for example with an IPv4 egress
MTU of 1500, IPv4 to IPv6 translation will already build 1520 byte IPv6 frames,
so you need a 1520 byte device MTU. This means if your IPv6 device's egress
MTU is 1280, your IPv4 route must be 1260 (and actually 1252, because of the
need to handle fragments). This is to handle normal non-GSO packets. Thus the
reduction is simply not needed for GSO packets, because when they're correctly
built, they will already be the right size.
(f) TSO/GSO should be able to exactly undo GRO: the number of packets (TCP
segments) should not be modified, so that TCP's MSS counting works correctly
(this matters for congestion control). If protocol conversion changes the
gso_size, then the number of TCP segments may increase or decrease. Packet loss
after protocol conversion can result in partial loss of MSS segments that the
sender sent. How's the sending TCP stack going to react to receiving ACKs/SACKs
in the middle of the segments it sent?
(g) skb_{decrease,increase}_gso_size() are already no-ops for GSO_BY_FRAGS
case (besides triggering WARN_ON_ONCE). This means you already cannot guarantee
that gso_size (and thus resulting packet MTU) is changed. ie. you must assume
it won't be changed.
(h) changing gso_size is outright buggy for UDP GSO packets, where framing
matters (I believe that's also the case for SCTP, but it's already excluded
by [g]). So the only remaining case is TCP, which also doesn't want it
(see [f]).
(i) see also the reasoning on the previous attempt at fixing this
(commit fa7b83bf3b156c767f3e4a25bbf3817b08f3ff8e) which shows that the current
behaviour causes TCP packet loss:
In the forwarding path GRO -> BPF 6 to 4 -> GSO for TCP traffic, the
coalesced packet payload can be > MSS, but < MSS + 20.
bpf_skb_proto_6_to_4() will upgrade the MSS and it can be > the payload
length. After then tcp_gso_segment checks for the payload length if it
is <= MSS. The condition is causing the packet to be dropped.
tcp_gso_segment():
[...]
mss = skb_shinfo(skb)->gso_size;
if (unlikely(skb->len <= mss)) goto out;
[...]
Thus changing the gso_size is simply a very bad idea. Increasing is unnecessary
and buggy, and decreasing can go negative.
Fixes: 6578171a7ff0 ("bpf: add bpf_skb_change_proto helper")
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Dongseok Yi <dseok.yi@samsung.com>
Cc: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/bpf/CANP3RGfjLikQ6dg=YpBU0OeHvyv7JOki7CyOUS9modaXAi-9vQ@mail.gmail.com
Link: https://lore.kernel.org/bpf/20210617000953.2787453-2-zenczykowski@gmail.com
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This reverts commit fa7b83bf3b156c767f3e4a25bbf3817b08f3ff8e.
See the followup commit for the reasoning why I believe the appropriate
approach is to simply make this change without a flag, but it can basically
be summarized as using this helper without the flag is bug-prone or outright
buggy, and thus the default should be this new behaviour.
As this commit has only made it into net-next/master, but not into
any real release, such a backwards incompatible change is still ok.
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Dongseok Yi <dseok.yi@samsung.com>
Cc: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/bpf/20210617000953.2787453-1-zenczykowski@gmail.com
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Devlink eswitch set command doesn't hold devlink->lock, which makes
possible race condition between rate list traversing and others devlink
rate KAPI calls, like devlink_rate_nodes_destroy().
Hold devlink lock while traversing the list.
Fixes: a8ecb93ef03d ("devlink: Introduce rate nodes")
Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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When eswitch is disabled, querying its current mode results in error.
Due to this when trying to set the eswitch mode for mlx5 devices, it
fails to set the eswitch switchdev mode.
Hence remove such check.
Fixes: a8ecb93ef03d ("devlink: Introduce rate nodes")
Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Port functions, like SFs, can be deleted by the user when its leaf rate
object has parent node. In such case node refcnt won't be decreased
which blocks the node from deletion later.
Do simple refcnt decrease, since driver in cleanup stage. This:
1) assumes that driver took proper internal parent unset action;
2) allows to avoid nested callbacks call and deadlock.
Fixes: d75559845078 ("devlink: Allow setting parent node of rate objects")
Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This commit adds two stats for the socket migration feature to evaluate the
effectiveness: LINUX_MIB_TCPMIGRATEREQ(SUCCESS|FAILURE).
If the migration fails because of the own_req race in receiving ACK and
sending SYN+ACK paths, we do not increment the failure stat. Then another
CPU is responsible for the req.
Link: https://lore.kernel.org/bpf/CAK6E8=cgFKuGecTzSCSQ8z3YJ_163C0uwO9yRvfDSE7vOe9mJA@mail.gmail.com/
Suggested-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux
Saeed Mahameed says:
====================
mlx5-net-next-2021-06-22
1) Various minor cleanups and fixes from net-next branch
2) Optimize mlx5 feature check on tx and
a fix to allow Vxlan with Ipsec offloads
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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Pablo Neira Ayuso says:
====================
Netfilter updates for net-next
The following patchset contains Netfilter updates for net-next:
1) Skip non-SCTP packets in the new SCTP chunk support for nft_exthdr,
from Phil Sutter.
2) Simplify TCP option sanity check for TCP packets, also from Phil.
3) Add a new expression to store when the rule has been used last time.
4) Pass the hook state object to log function, from Florian Westphal.
5) Document the new sysctl knobs to tune the flowtable timeouts,
from Oz Shlomo.
6) Fix snprintf error check in the new nfnetlink_hook infrastructure,
from Dan Carpenter.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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As MISSED and DRAINING state are used to indicate a non-empty
qdisc, qdisc->empty is not longer needed, so remove it.
Acked-by: Jakub Kicinski <kuba@kernel.org>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com> # flexcan
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Currently pfifo_fast has both TCQ_F_CAN_BYPASS and TCQ_F_NOLOCK
flag set, but queue discipline by-pass does not work for lockless
qdisc because skb is always enqueued to qdisc even when the qdisc
is empty, see __dev_xmit_skb().
This patch calls sch_direct_xmit() to transmit the skb directly
to the driver for empty lockless qdisc, which aviod enqueuing
and dequeuing operation.
As qdisc->empty is not reliable to indicate a empty qdisc because
there is a time window between enqueuing and setting qdisc->empty.
So we use the MISSED state added in commit a90c57f2cedd ("net:
sched: fix packet stuck problem for lockless qdisc"), which
indicate there is lock contention, suggesting that it is better
not to do the qdisc bypass in order to avoid packet out of order
problem.
In order to make MISSED state reliable to indicate a empty qdisc,
we need to ensure that testing and clearing of MISSED state is
within the protection of qdisc->seqlock, only setting MISSED state
can be done without the protection of qdisc->seqlock. A MISSED
state testing is added without the protection of qdisc->seqlock to
aviod doing unnecessary spin_trylock() for contention case.
As the enqueuing is not within the protection of qdisc->seqlock,
there is still a potential data race as mentioned by Jakub [1]:
thread1 thread2 thread3
qdisc_run_begin() # true
qdisc_run_begin(q)
set(MISSED)
pfifo_fast_dequeue
clear(MISSED)
# recheck the queue
qdisc_run_end()
enqueue skb1
qdisc empty # true
qdisc_run_begin() # true
sch_direct_xmit() # skb2
qdisc_run_begin()
set(MISSED)
When above happens, skb1 enqueued by thread2 is transmited after
skb2 is transmited by thread3 because MISSED state setting and
enqueuing is not under the qdisc->seqlock. If qdisc bypass is
disabled, skb1 has better chance to be transmited quicker than
skb2.
This patch does not take care of the above data race, because we
view this as similar as below:
Even at the same time CPU1 and CPU2 write the skb to two socket
which both heading to the same qdisc, there is no guarantee that
which skb will hit the qdisc first, because there is a lot of
factor like interrupt/softirq/cache miss/scheduling afffecting
that.
There are below cases that need special handling:
1. When MISSED state is cleared before another round of dequeuing
in pfifo_fast_dequeue(), and __qdisc_run() might not be able to
dequeue all skb in one round and call __netif_schedule(), which
might result in a non-empty qdisc without MISSED set. In order
to avoid this, the MISSED state is set for lockless qdisc and
__netif_schedule() will be called at the end of qdisc_run_end.
2. The MISSED state also need to be set for lockless qdisc instead
of calling __netif_schedule() directly when requeuing a skb for
a similar reason.
3. For netdev queue stopped case, the MISSED case need clearing
while the netdev queue is stopped, otherwise there may be
unnecessary __netif_schedule() calling. So a new DRAINING state
is added to indicate this case, which also indicate a non-empty
qdisc.
4. As there is already netif_xmit_frozen_or_stopped() checking in
dequeue_skb() and sch_direct_xmit(), which are both within the
protection of qdisc->seqlock, but the same checking in
__dev_xmit_skb() is without the protection, which might cause
empty indication of a lockless qdisc to be not reliable. So
remove the checking in __dev_xmit_skb(), and the checking in
the protection of qdisc->seqlock seems enough to avoid the cpu
consumption problem for netdev queue stopped case.
1. https://lkml.org/lkml/2021/5/29/215
Acked-by: Jakub Kicinski <kuba@kernel.org>
Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com> # flexcan
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This switches the airtime scheduler in mac80211 to use a virtual
time-based scheduler instead of the round-robin scheduler used before.
This has a couple of advantages:
- No need to sync up the round-robin scheduler in firmware/hardware with
the round-robin airtime scheduler.
- If several stations are eligible for transmission we can schedule both
of them; no need to hard-block the scheduling rotation until the head
of the queue has used up its quantum.
- The check of whether a station is eligible for transmission becomes
simpler (in ieee80211_txq_may_transmit()).
The drawback is that scheduling becomes slightly more expensive, as we
need to maintain an rbtree of TXQs sorted by virtual time. This means
that ieee80211_register_airtime() becomes O(logN) in the number of
currently scheduled TXQs because it can change the order of the
scheduled stations. We mitigate this overhead by only resorting when a
station changes position in the tree, and hopefully N rarely grows too
big (it's only TXQs currently backlogged, not all associated stations),
so it shouldn't be too big of an issue.
To prevent divisions in the fast path, we maintain both station sums and
pre-computed reciprocals of the sums. This turns the fast-path operation
into a multiplication, with divisions only happening as the number of
active stations change (to re-compute the current sum of all active
station weights). To prevent this re-computation of the reciprocal from
happening too frequently, we use a time-based notion of station
activity, instead of updating the weight every time a station gets
scheduled or de-scheduled. As queues can oscillate between empty and
occupied quite frequently, this can significantly cut down on the number
of re-computations. It also has the added benefit of making the station
airtime calculation independent on whether the queue happened to have
drained at the time an airtime value was accounted.
Co-developed-by: Yibo Zhao <yiboz@codeaurora.org>
Signed-off-by: Yibo Zhao <yiboz@codeaurora.org>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/r/20210623134755.235545-1-toke@redhat.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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This reverts commit f39b07fdfb68 ("mac80211: HE STA disassoc
due to QOS NULL not sent")
Since iwlwifi specific workaround, which blocks to send NDP,
is removed, we can revert this commit.
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://lore.kernel.org/r/20210623134826.10318-2-pkshih@realtek.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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