net: sfc: add missing xdp queue reinitialization
[ Upstream commit
059a47f1da93811d37533556d67e72f2261b1127 ]
After rx/tx ring buffer size is changed, kernel panic occurs when
it acts XDP_TX or XDP_REDIRECT.
When tx/rx ring buffer size is changed(ethtool -G), sfc driver
reallocates and reinitializes rx and tx queues and their buffer
(tx_queue->buffer).
But it misses reinitializing xdp queues(efx->xdp_tx_queues).
So, while it is acting XDP_TX or XDP_REDIRECT, it uses the uninitialized
tx_queue->buffer.
A new function efx_set_xdp_channels() is separated from efx_set_channels()
to handle only xdp queues.
Splat looks like:
BUG: kernel NULL pointer dereference, address:
000000000000002a
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0
Oops: 0002 [#4] PREEMPT SMP NOPTI
RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]
CPU: 2 PID: 0 Comm: swapper/2 Tainted: G D 5.17.0+ #55
e8beeee8289528f11357029357cf
Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80
RSP: 0018:
ffff92f121e45c60 EFLAGS:
00010297
RIP: 0010:efx_tx_map_chunk+0x54/0x90 [sfc]
RAX:
0000000000000040 RBX:
ffff92ea506895c0 RCX:
ffffffffc0330870
RDX:
0000000000000001 RSI:
00000001139b10ce RDI:
ffff92ea506895c0
RBP:
ffffffffc0358a80 R08:
00000001139b110d R09:
0000000000000000
R10:
0000000000000001 R11:
ffff92ea414c0088 R12:
0000000000000040
R13:
0000000000000018 R14:
00000001139b10ce R15:
ffff92ea506895c0
FS:
0000000000000000(0000) GS:
ffff92f121ec0000(0000) knlGS:
0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Code: 48 8b 8d a8 01 00 00 48 8d 14 52 4c 8d 2c d0 44 89 e0 48 85 c9 74 0e 44 89 e2 4c 89 f6 48 80
CR2:
000000000000002a CR3:
00000003e6810004 CR4:
00000000007706e0
RSP: 0018:
ffff92f121e85c60 EFLAGS:
00010297
PKRU:
55555554
RAX:
0000000000000040 RBX:
ffff92ea50689700 RCX:
ffffffffc0330870
RDX:
0000000000000001 RSI:
00000001145a90ce RDI:
ffff92ea50689700
RBP:
ffffffffc0358a80 R08:
00000001145a910d R09:
0000000000000000
R10:
0000000000000001 R11:
ffff92ea414c0088 R12:
0000000000000040
R13:
0000000000000018 R14:
00000001145a90ce R15:
ffff92ea50689700
FS:
0000000000000000(0000) GS:
ffff92f121e80000(0000) knlGS:
0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
CR2:
000000000000002a CR3:
00000003e6810005 CR4:
00000000007706e0
PKRU:
55555554
Call Trace:
<IRQ>
efx_xdp_tx_buffers+0x12b/0x3d0 [sfc
84c94b8e32d44d296c17e10a634d3ad454de4ba5]
__efx_rx_packet+0x5c3/0x930 [sfc
84c94b8e32d44d296c17e10a634d3ad454de4ba5]
efx_rx_packet+0x28c/0x2e0 [sfc
84c94b8e32d44d296c17e10a634d3ad454de4ba5]
efx_ef10_ev_process+0x5f8/0xf40 [sfc
84c94b8e32d44d296c17e10a634d3ad454de4ba5]
? enqueue_task_fair+0x95/0x550
efx_poll+0xc4/0x360 [sfc
84c94b8e32d44d296c17e10a634d3ad454de4ba5]
Fixes:
3990a8fffbda ("sfc: allocate channels for XDP tx queues")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>