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linux/drivers/net/dsa
Vladimir Oltean ac02a451a6 net: dsa: sja1105: implement cross-chip bridging operations
sja1105 uses dsa_8021q for DSA tagging, a format which is VLAN at heart
and which is compatible with cascading. A complete description of this
tagging format is in net/dsa/tag_8021q.c, but a quick summary is that
each external-facing port tags incoming frames with a unique pvid, and
this special VLAN is transmitted as tagged towards the inside of the
system, and as untagged towards the exterior. The tag encodes the switch
id and the source port index.

This means that cross-chip bridging for dsa_8021q only entails adding
the dsa_8021q pvids of one switch to the RX filter of the other
switches. Everything else falls naturally into place, as long as the
bottom-end of ports (the leaves in the tree) is comprised exclusively of
dsa_8021q-compatible (i.e. sja1105 switches). Otherwise, there would be
a chance that a front-panel switch transmits a packet tagged with a
dsa_8021q header, header which it wouldn't be able to remove, and which
would hence "leak" out.

The only use case I tested (due to lack of board availability) was when
the sja1105 switches are part of disjoint trees (however, this doesn't
change the fact that multiple sja1105 switches still need unique switch
identifiers in such a system). But in principle, even "true" single-tree
setups (with DSA links) should work just as fine, except for a small
change which I can't test: dsa_towards_port should be used instead of
dsa_upstream_port (I made the assumption that the routing port that any
sja1105 should use towards its neighbours is the CPU port. That might
not hold true in other setups).

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-05-10 19:52:33 -07:00
..
b53 net: dsa: b53: Remove is_static argument to b53_read_op() 2020-04-30 17:43:29 -07:00
microchip net: dsa: ksz: Select KSZ protocol tag 2020-03-31 10:04:40 -07:00
mv88e6xxx net: dsa: permit cross-chip bridging between all trees in the system 2020-05-10 19:52:33 -07:00
ocelot Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-05-06 22:10:13 -07:00
qca net: dsa: propagate resolved link config via mac_link_up() 2020-02-27 12:02:14 -08:00
sja1105 net: dsa: sja1105: implement cross-chip bridging operations 2020-05-10 19:52:33 -07:00
bcm_sf2.c net: dsa: bcm_sf2: Ensure correct sub-node is parsed 2020-04-06 10:22:58 -07:00
bcm_sf2.h net: dsa: bcm_sf2: Add support for optional reset controller line 2019-11-05 18:06:38 -08:00
bcm_sf2_cfp.c net: dsa: bcm_sf2: Support specifying VLAN tag egress rule 2020-03-30 19:55:42 -07:00
bcm_sf2_regs.h Revert "net: dsa: bcm_sf2: Also configure Port 5 for 2Gb/sec on 7278" 2020-02-26 16:33:35 -08:00
dsa_loop.c net: dsa: Get information about stacked DSA protocol 2020-01-08 16:01:13 -08:00
dsa_loop.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dsa_loop_bdinfo.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
Kconfig net: dsa: vsc73xx: Remove dependency on CONFIG_OF 2020-01-05 14:23:48 -08:00
lan9303-core.c net: dsa: Get information about stacked DSA protocol 2020-01-08 16:01:13 -08:00
lan9303.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-11-04 09:26:51 +09:00
lan9303_i2c.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
lan9303_mdio.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
lantiq_gswip.c net: dsa: propagate resolved link config via mac_link_up() 2020-02-27 12:02:14 -08:00
lantiq_pce.h net: dsa: Use the correct style for SPDX License Identifier 2019-09-22 15:25:08 -07:00
Makefile net: dsa: add support for Atheros AR9331 built-in switch 2019-12-20 17:05:47 -08:00
mt7530.c net: dsa: mt7530: fix tagged frames pass-through in VLAN-unaware mode 2020-04-16 13:32:05 -07:00
mt7530.h net: dsa: mt7530: fix tagged frames pass-through in VLAN-unaware mode 2020-04-16 13:32:05 -07:00
mv88e6060.c net: dsa: Get information about stacked DSA protocol 2020-01-08 16:01:13 -08:00
mv88e6060.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
qca8k.c net: dsa: Get information about stacked DSA protocol 2020-01-08 16:01:13 -08:00
qca8k.h net: dsa: qca8k: introduce reset via gpio feature 2019-06-27 11:17:30 -07:00
realtek-smi-core.c net: dsa: remove dsa_switch_alloc helper 2019-10-22 12:37:07 -07:00
realtek-smi-core.h net: dsa: fix warning same module names 2019-06-14 19:28:54 -07:00
rtl8366.c net: dsa: rtl8366: Check VLAN ID and not ports 2019-10-02 12:09:23 -04:00
rtl8366rb.c net: dsa: Get information about stacked DSA protocol 2020-01-08 16:01:13 -08:00
vitesse-vsc73xx-core.c net: dsa: vsc73xx: make the MTU configurable 2020-03-27 16:07:25 -07:00
vitesse-vsc73xx-platform.c net: dsa: vsc73xx: convert to devm_platform_ioremap_resource 2020-05-08 22:28:24 -07:00
vitesse-vsc73xx-spi.c net: dsa: vsc73xx: Split vsc73xx driver 2019-07-07 14:16:32 -07:00
vitesse-vsc73xx.h net: dsa: vsc73xx: Split vsc73xx driver 2019-07-07 14:16:32 -07:00