linux/include/soc
Vladimir Oltean 95706be13b net: mscc: ocelot: create a function that replaces an existing VCAP filter
VCAP (Versatile Content Aware Processor) is the TCAM-based engine behind
tc flower offload on ocelot, among other things. The ingress port mask
on which VCAP rules match is present as a bit field in the actual key of
the rule. This means that it is possible for a rule to be shared among
multiple source ports. When the rule is added one by one on each desired
port, that the ingress port mask of the key must be edited and rewritten
to hardware.

But the API in ocelot_vcap.c does not allow for this. For one thing,
ocelot_vcap_filter_add() and ocelot_vcap_filter_del() are not symmetric,
because ocelot_vcap_filter_add() works with a preallocated and
prepopulated filter and programs it to hardware, and
ocelot_vcap_filter_del() does both the job of removing the specified
filter from hardware, as well as kfreeing it. That is to say, the only
option of editing a filter in place, which is to delete it, modify the
structure and add it back, does not work because it results in
use-after-free.

This patch introduces ocelot_vcap_filter_replace, which trivially
reprograms a VCAP entry to hardware, at the exact same index at which it
existed before, without modifying any list or allocating any memory.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-11-26 11:38:20 -08:00
..
arc clocksource/drivers/arc_timer: Eliminate redefined macro error 2021-10-16 22:15:01 +02:00
at91 ARM: at91: ddr: add registers definitions for sama7g5's ddr 2021-07-19 14:32:12 +02:00
bcm2835 firmware: raspberrypi: Introduce devm_rpi_firmware_get() 2021-03-22 17:59:51 +01:00
canaan clk: Add RISC-V Canaan Kendryte K210 clock driver 2021-02-22 17:51:04 -08:00
fsl soc: fsl: dpio: add Net DIM integration 2021-10-15 14:32:41 +01:00
imx ARM: imx: Initialize SoC ID on i.MX50 2021-05-13 15:42:21 +08:00
mediatek IOMMU Updates for Linux v5.12 2021-02-22 10:31:29 -08:00
microchip mbox: add polarfire soc system controller mailbox 2021-06-26 12:06:48 -05:00
mscc net: mscc: ocelot: create a function that replaces an existing VCAP filter 2021-11-26 11:38:20 -08:00
qcom soc: qcom: spm: Implement support for SAWv4.1, SDM630/660 L2 AVS 2021-09-21 17:41:48 -05:00
rockchip treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 2019-06-05 17:36:37 +02:00
sa1100 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
sifive riscv: move sifive_l2_cache.h to include/soc 2020-01-12 10:12:44 -08:00
tegra soc/tegra: pm: Make stubs usable for compile testing 2021-10-04 21:27:40 +02:00