[RFC PATCH next-next v3 00/20] Multiple improvement to qca8k stability

Ansuel Smith
2021-05-04T22:32:14Z

Currently qca8337 switch are widely used on ipq8064 based router.
On these particular router it was notice a very unstable switch with
port not link detected as link with unknown speed, port dropping
randomly and general unreliability. Lots of testing and comparison
between this dsa driver and the original qsdk driver showed lack of some
additional delay and values. A main difference arised from the original
driver and the dsa one. The original driver didn't use MASTER regs to
read phy status and the dedicated mdio driver worked correctly. Now that
the dsa driver actually use these regs, it was found that these special
read/write operation required mutual exclusion to normal
qca8k_read/write operation. The add of mutex for these operation fixed
the random port dropping and now only the actual linked port randomly
dropped. Adding additional delay for set_page operation and fixing a bug
in the mdio dedicated driver fixed also this problem. The current driver
requires also more time to apply vlan switch. All of these changes and
tweak permit a now very stable and reliable dsa driver and 0 port
dropping. This series is currently tested by at least 5 user with
different routers and all reports positive results and no problems.

Changes v3:
- Revert mdio writel changes (use regmap with REGCACHE disabled)
- Split propagate error patch to 4 different patch
Changes v2:
- Implemented phy driver for internal PHYs
I'm testing cable test functions as I found some documentation that
actually declare regs about it. Problem is that it doesn't actually
work. It seems that the value set are ignored by the phy.
- Made the rgmii delay configurable
- Reordered patch
- Split mdio patches to more specific ones
- Reworked mdio driver to use readl/writel instead of regmap
- Reworked the entire driver to make it aware of any read/write error.
- Added phy generic patch to pass flags with phylink_connect_phy
function

A decision about the extra mdio delay is still to be taken but I
preferred to push a v2 since there is a new driver and more changes than
v0.

Ansuel Smith (20):
net: mdio: ipq8064: clean whitespaces in define
net: mdio: ipq8064: add regmap config to disable REGCACHE
net: mdio: ipq8064: enlarge sleep after read/write operation
net: dsa: qca8k: handle qca8k_set_page errors
net: dsa: qca8k: handle error with qca8k_read operation
net: dsa: qca8k: handle error with qca8k_write operation
net: dsa: qca8k: handle error with qca8k_rmw operation
net: dsa: qca8k: add support for qca8327 switch
devicetree: net: dsa: qca8k: Document new compatible qca8327
net: dsa: qca8k: add priority tweak to qca8337 switch
net: dsa: qca8k: add GLOBAL_FC settings needed for qca8327
net: dsa: qca8k: add support for switch rev
net: dsa: qca8k: make rgmii delay configurable
net: dsa: qca8k: clear MASTER_EN after phy read/write
net: dsa: qca8k: dsa: qca8k: protect MASTER busy_wait with mdio mutex
net: dsa: qca8k: enlarge mdio delay and timeout
net: phy: phylink: permit to pass dev_flags to phylink_connect_phy
net: dsa: slave: pass dev_flags also to internal PHY
net: dsa: qca8k: pass switch_revision info to phy dev_flags
net: phy: add qca8k driver for qca8k switch internal PHY

.../devicetree/bindings/net/dsa/qca8k.txt | 1 +
drivers/net/dsa/qca8k.c | 602 ++++++++++++++----
drivers/net/dsa/qca8k.h | 54 +-
drivers/net/ethernet/cadence/macb_main.c | 2 +-
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
drivers/net/mdio/mdio-ipq8064.c | 58 +-
drivers/net/phy/Kconfig | 7 +
drivers/net/phy/Makefile | 1 +
drivers/net/phy/phylink.c | 12 +-
drivers/net/phy/qca8k.c | 174 +++++
include/linux/phylink.h | 2 +-
net/dsa/slave.c | 6 +-
12 files changed, 756 insertions(+), 165 deletions(-)
create mode 100644 drivers/net/phy/qca8k.c

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2.30.2