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SLIP: Switch to poll based design

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This is a refactored version of the SLIP network driver.  Updates
include:

1. The original design started two kernel threads per SLIP device.
   The refactored version uses file_poll to essentially be driven
   by the UART RX and TX interrupts and pushes work to the low
   priority work queue.

2. The SLIP byte un-/stuffing is more efficient now, using memcpy
   instead of handling each byte individually.

3. The switch of the old SLIP driver to IOBs caused buffer overwrites
   if packets were sent that would not fit into a single IOB.  This is
   fixed now.

Signed-off-by: Michael Jung <michael.jung@secore.ly>
This commit is contained in:
Michael Jung 2023-05-25 18:12:53 +02:00 committed by Alan Carvalho de Assis
parent 6424b5322f
commit 2e27698d6c
2 changed files with 618 additions and 614 deletions
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1216
drivers/net/slip.c
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16
net/Kconfig
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@ -192,6 +192,7 @@ menuconfig NET_MBIM
menuconfig NET_SLIP
bool "SLIP support"
select ARCH_HAVE_NETDEV_STATISTICS
depends on NET_IPv4
default n
---help---
Enables building of the SLIP driver. SLIP requires
@ -221,21 +222,6 @@ config NET_SLIP_NINTERFACES
interfaces to support.
Default: 1
config NET_SLIP_STACKSIZE
int "SLIP per-thread stack size"
default DEFAULT_TASK_STACKSIZE
---help---
Select the stack size of the SLIP RX and TX tasks.
SLIP starts two dedicated threads per interface
to handle network events, enabling high performance.
config NET_SLIP_DEFPRIO
int "SLIP threads priority"
default 128
---help---
The priority of the SLIP RX and TX tasks. Default: 128
endif # NET_SLIP
menuconfig NET_TUN