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af_packet: TPACKET_V3: replace busy-wait loop

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A busy-wait loop is used to implement waiting for bits to be copied
from the skb to the kernel buffer before retiring a block. This is
a problem on PREEMPT_RT because the copying task could be preempted
by the busy-waiting task and thus live lock in the busy-wait loop.

Replace the busy-wait logic with an rwlock_t. This provides lockdep
coverage and makes the code RT ready.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
John Ogness
2020-07-07 17:28:04 +02:06
committed by Jakub Kicinski
parent 999cf8aeb6
commit 632ca50f2c
2 changed files with 11 additions and 11 deletions
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2
net/packet/internal.h
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@@ -39,7 +39,7 @@ struct tpacket_kbdq_core {
char *nxt_offset;
struct sk_buff *skb;
atomic_t blk_fill_in_prog;
rwlock_t blk_fill_in_prog_lock;
/* Default is set to 8ms */
#define DEFAULT_PRB_RETIRE_TOV (8)