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net: ppp_l2: Make prio of PPP TX thread configurable

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The PPP TX thread handles the transmission of packets at PPP layer.
Make it's priority configurable, so it's priority can be configured higher
then higher protocol layers.

Signed-off-by: Sjors Hettinga <s.a.hettinga@gmail.com>
This commit is contained in:
Sjors Hettinga 2023-08-02 08:49:24 +02:00 committed by Carles Cufí
parent cb31883e1b
commit 6783848b8f
2 changed files with 18 additions and 2 deletions
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16
subsys/net/l2/ppp/Kconfig
View file

@ -92,4 +92,20 @@ config NET_L2_PPP_TX_STACK_SIZE
help
Set the TX handler stack size.
config NET_L2_PPP_THREAD_PRIO
int "Priority of the PPP TX thread"
default 1
help
Set the priority of the the PPP TX thread, that handles all
transmission of PPP packets.
Value 0 = highest priortity.
When CONFIG_NET_TC_THREAD_COOPERATIVE = y, lowest priority is
CONFIG_NUM_COOP_PRIORITIES-1 else lowest priority is
CONFIG_NUM_PREEMPT_PRIORITIES-1.
When using PPP in combination with TCP, make sure the priority
is higher (or equal) than the TCP work queue, otherwise the
TCP stack will consume all net_bufs before transferring
execution to the lower layer network stack, with a high risk of
running out of net_bufs.
endif # NET_L2_PPP

4
subsys/net/l2/ppp/ppp_l2.c
View file

@ -26,9 +26,9 @@ static K_FIFO_DEFINE(tx_queue);
#if defined(CONFIG_NET_TC_THREAD_COOPERATIVE)
/* Lowest priority cooperative thread */
#define THREAD_PRIORITY K_PRIO_COOP(CONFIG_NUM_COOP_PRIORITIES - 1)
#define THREAD_PRIORITY K_PRIO_COOP(CONFIG_NET_L2_PPP_THREAD_PRIO)
#else
#define THREAD_PRIORITY K_PRIO_PREEMPT(CONFIG_NUM_PREEMPT_PRIORITIES - 1)
#define THREAD_PRIORITY K_PRIO_PREEMPT(CONFIG_NET_L2_PPP_THREAD_PRIO)
#endif
static void tx_handler(void);