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2022-05-23net: dsa: OF-ware slave_mii_busLuiz Angelo Daros de Luca1-1/+6
If found, register the DSA internally allocated slave_mii_bus with an OF "mdio" child object. It can save some drivers from creating their custom internal MDIO bus. Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-05-12net: dsa: remove port argument from ->change_tag_protocol()Vladimir Oltean2-17/+11
DSA has not supported (and probably will not support in the future either) independent tagging protocols per CPU port. Different switch drivers have different requirements, some may need to replicate some settings for each CPU port, some may need to apply some settings on a single CPU port, while some may have to configure some global settings and then some per-CPU-port settings. In any case, the current model where DSA calls ->change_tag_protocol for each CPU port turns out to be impractical for drivers where there are global things to be done. For example, felix calls dsa_tag_8021q_register(), which makes no sense per CPU port, so it suppresses the second call. Let drivers deal with replication towards all CPU ports, and remove the CPU port argument from the function prototype. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Acked-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-05-12net: dsa: felix: manage host flooding using a specific driver callbackVladimir Oltean3-30/+15
At the time - commit 7569459a52c9 ("net: dsa: manage flooding on the CPU ports") - not introducing a dedicated switch callback for host flooding made sense, because for the only user, the felix driver, there was nothing different to do for the CPU port than set the flood flags on the CPU port just like on any other bridge port. There are 2 reasons why this approach is not good enough, however. (1) Other drivers, like sja1105, support configuring flooding as a function of {ingress port, egress port}, whereas the DSA ->port_bridge_flags() function only operates on an egress port. So with that driver we'd have useless host flooding from user ports which don't need it. (2) Even with the felix driver, support for multiple CPU ports makes it difficult to piggyback on ->port_bridge_flags(). The way in which the felix driver is going to support host-filtered addresses with multiple CPU ports is that it will direct these addresses towards both CPU ports (in a sort of multicast fashion), then restrict the forwarding to only one of the two using the forwarding masks. Consequently, flooding will also be enabled towards both CPU ports. However, ->port_bridge_flags() gets passed the index of a single CPU port, and that leaves the flood settings out of sync between the 2 CPU ports. This is to say, it's better to have a specific driver method for host flooding, which takes the user port as argument. This solves problem (1) by allowing the driver to do different things for different user ports, and problem (2) by abstracting the operation and letting the driver do whatever, rather than explicitly making the DSA core point to the CPU port it thinks needs to be touched. This new method also creates a problem, which is that cross-chip setups are not handled. However I don't have hardware right now where I can test what is the proper thing to do, and there isn't hardware compatible with multi-switch trees that supports host flooding. So it remains a problem to be tackled in the future. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-05-12Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-0/+1
No conflicts. Build issue in drivers/net/ethernet/sfc/ptp.c 54fccfdd7c66 ("sfc: efx_default_channel_type APIs can be static") 49e6123c65da ("net: sfc: fix memory leak due to ptp channel") https://lore.kernel.org/all/20220510130556.52598fe2@canb.auug.org.au/ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-05-09net: dsa: flush switchdev workqueue on bridge join error pathVladimir Oltean1-0/+1
There is a race between switchdev_bridge_port_offload() and the dsa_port_switchdev_sync_attrs() call right below it. When switchdev_bridge_port_offload() finishes, FDB entries have been replayed by the bridge, but are scheduled for deferred execution later. However dsa_port_switchdev_sync_attrs -> dsa_port_can_apply_vlan_filtering() may impose restrictions on the vlan_filtering attribute and refuse offloading. When this happens, the delayed FDB entries will dereference dp->bridge, which is a NULL pointer because we have stopped the process of offloading this bridge. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Workqueue: dsa_ordered dsa_slave_switchdev_event_work pc : dsa_port_bridge_host_fdb_del+0x64/0x100 lr : dsa_slave_switchdev_event_work+0x130/0x1bc Call trace: dsa_port_bridge_host_fdb_del+0x64/0x100 dsa_slave_switchdev_event_work+0x130/0x1bc process_one_work+0x294/0x670 worker_thread+0x80/0x460 ---[ end trace 0000000000000000 ]--- Error: dsa_core: Must first remove VLAN uppers having VIDs also present in bridge. Fix the bug by doing what we do on the normal bridge leave path as well, which is to wait until the deferred FDB entries complete executing, then exit. The placement of dsa_flush_workqueue() after switchdev_bridge_port_unoffload() guarantees that both the FDB additions and deletions on rollback are waited for. Fixes: d7d0d423dbaa ("net: dsa: flush switchdev workqueue when leaving the bridge") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://lore.kernel.org/r/20220507134550.1849834-1-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-05-06net: dsa: delete dsa_port_walk_{fdbs,mdbs}Vladimir Oltean1-40/+0
All the users of these functions are gone, delete them before they gain new ones. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-04-28Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski2-1/+3
include/linux/netdevice.h net/core/dev.c 6510ea973d8d ("net: Use this_cpu_inc() to increment net->core_stats") 794c24e9921f ("net-core: rx_otherhost_dropped to core_stats") https://lore.kernel.org/all/20220428111903.5f4304e0@canb.auug.org.au/ drivers/net/wan/cosa.c d48fea8401cf ("net: cosa: fix error check return value of register_chrdev()") 89fbca3307d4 ("net: wan: remove support for COSA and SRP synchronous serial boards") https://lore.kernel.org/all/20220428112130.1f689e5e@canb.auug.org.au/ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-04-25net: dsa: remove unused headersMarcin Wojtas1-9/+0
Reduce a number of included headers to a necessary minimum. Signed-off-by: Marcin Wojtas <mw@semihalf.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-04-25net: dsa: flood multicast to CPU when slave has IFF_PROMISCVladimir Oltean1-1/+1
Certain DSA switches can eliminate flooding to the CPU when none of the ports have the IFF_ALLMULTI or IFF_PROMISC flags set. This is done by synthesizing a call to dsa_port_bridge_flags() for the CPU port, a call which normally comes from the bridge driver via switchdev. The bridge port flags and IFF_PROMISC|IFF_ALLMULTI have slightly different semantics, and due to inattention/lack of proper testing, the IFF_PROMISC flag allows unknown unicast to be flooded to the CPU, but not unknown multicast. This must be fixed by setting both BR_FLOOD (unicast) and BR_MCAST_FLOOD in the synthesized dsa_port_bridge_flags() call, since IFF_PROMISC means that packets should not be filtered regardless of their MAC DA. Fixes: 7569459a52c9 ("net: dsa: manage flooding on the CPU ports") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-04-22net: dsa: Add missing of_node_put() in dsa_port_link_register_ofMiaoqian Lin1-0/+2
The device_node pointer is returned by of_parse_phandle() with refcount incremented. We should use of_node_put() on it when done. of_node_put() will check for NULL value. Fixes: a20f997010c4 ("net: dsa: Don't instantiate phylink for CPU/DSA ports unless needed") Signed-off-by: Miaoqian Lin <linmq006@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-04-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netPaolo Abeni1-0/+8
drivers/net/ethernet/microchip/lan966x/lan966x_main.c d08ed852560e ("net: lan966x: Make sure to release ptp interrupt") c8349639324a ("net: lan966x: Add FDMA functionality") Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2022-04-20net: dsa: don't emit targeted cross-chip notifiers for MTU changeVladimir Oltean4-25/+7
A cross-chip notifier with "targeted_match=true" is one that matches only the local port of the switch that emitted it. In other words, passing through the cross-chip notifier layer serves no purpose. Eliminate this concept by calling directly ds->ops->port_change_mtu instead of emitting a targeted cross-chip notifier. This leaves the DSA_NOTIFIER_MTU event being emitted only for MTU updates on the CPU port, which need to be reflected also across all DSA links. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-04-20net: dsa: drop dsa_slave_priv from dsa_slave_change_mtuVladimir Oltean1-2/+1
We can get a hold of the "ds" pointer directly from "dp", no need for the dsa_slave_priv. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-04-20net: dsa: avoid one dsa_to_port() in dsa_slave_change_mtuVladimir Oltean1-4/+1
We could retrieve the cpu_dp pointer directly from the "dp" we already have, no need to resort to dsa_to_port(ds, port). This change also removes the need for an "int port", so that is also deleted. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-04-20net: dsa: use dsa_tree_for_each_user_port in dsa_slave_change_mtuVladimir Oltean1-8/+5
Use the more conventional iterator over user ports instead of explicitly ignoring them, and use the more conventional name "other_dp" instead of "dp_iter", for readability. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-04-20net: dsa: make cross-chip notifiers more efficient for host eventsVladimir Oltean4-140/+76
To determine whether a given port should react to the port targeted by the notifier, dsa_port_host_vlan_match() and dsa_port_host_address_match() look at the positioning of the switch port currently executing the notifier relative to the switch port for which the notifier was emitted. To maintain stylistic compatibility with the other match functions from switch.c, the host address and host VLAN match functions take the notifier information about targeted port, switch and tree indices as argument. However, these functions only use that information to retrieve the struct dsa_port *targeted_dp, which is an invariant for the outer loop that calls them. So it makes more sense to calculate the targeted dp only once, and pass it to them as argument. But furthermore, the targeted dp is actually known at the time the call to dsa_port_notify() is made. It is just that we decide to only save the indices of the port, switch and tree in the notifier structure, just to retrace our steps and find the dp again using dsa_switch_find() and dsa_to_port(). But both the above functions are relatively expensive, since they need to iterate through lists. It appears more straightforward to make all notifiers just pass the targeted dp inside their info structure, and have the code that needs the indices to look at info->dp->index instead of info->port, or info->dp->ds->index instead of info->sw_index, or info->dp->ds->dst->index instead of info->tree_index. For the sake of consistency, all cross-chip notifiers are converted to pass the "dp" directly. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-04-20net: dsa: move reset of VLAN filtering to dsa_port_switchdev_unsync_attrsVladimir Oltean2-61/+57
In dsa_port_switchdev_unsync_attrs() there is a comment that resetting the VLAN filtering isn't done where it is expected. And since commit 108dc8741c20 ("net: dsa: Avoid cross-chip syncing of VLAN filtering"), there is no reason to handle this in switch.c either. Therefore, move the logic to port.c, and adapt it slightly to the data structures and naming conventions from there. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-04-19net: dsa: hellcreek: Calculate checksums in taggerKurt Kanzenbach1-0/+8
In case the checksum calculation is offloaded to the DSA master network interface, it will include the switch trailing tag. As soon as the switch strips that tag on egress, the calculated checksum is wrong. Therefore, add the checksum calculation to the tagger (if required) before adding the switch tag. This way, the hellcreek code works with all DSA master interfaces regardless of their declared feature set. Fixes: 01ef09caad66 ("net: dsa: Add tag handling for Hirschmann Hellcreek switches") Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Link: https://lore.kernel.org/r/20220415103320.90657-1-kurt@linutronix.de Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2022-04-13Revert "net: dsa: setup master before ports"Vladimir Oltean1-13/+10
This reverts commit 11fd667dac315ea3f2469961f6d2869271a46cae. dsa_slave_change_mtu() updates the MTU of the DSA master and of the associated CPU port, but only if it detects a change to the master MTU. The blamed commit in the Fixes: tag below addressed a regression where dsa_slave_change_mtu() would return early and not do anything due to ds->ops->port_change_mtu() not being implemented. However, that commit also had the effect that the master MTU got set up to the correct value by dsa_master_setup(), but the associated CPU port's MTU did not get updated. This causes breakage for drivers that rely on the ->port_change_mtu() DSA call to account for the tagging overhead on the CPU port, and don't set up the initial MTU during the setup phase. Things actually worked before because they were in a fragile equilibrium where dsa_slave_change_mtu() was called before dsa_master_setup() was. So dsa_slave_change_mtu() could actually detect a change and update the CPU port MTU too. Restore the code to the way things used to work by reverting the reorder of dsa_tree_setup_master() and dsa_tree_setup_ports(). That change did not have a concrete motivation going for it anyway, it just looked better. Fixes: 066dfc429040 ("Revert "net: dsa: stop updating master MTU from master.c"") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-04-01Revert "net: dsa: stop updating master MTU from master.c"Vladimir Oltean1-1/+24
This reverts commit a1ff94c2973c43bc1e2677ac63ebb15b1d1ff846. Switch drivers that don't implement ->port_change_mtu() will cause the DSA master to remain with an MTU of 1500, since we've deleted the other code path. In turn, this causes a regression for those systems, where MTU-sized traffic can no longer be terminated. Revert the change taking into account the fact that rtnl_lock() is now taken top-level from the callers of dsa_master_setup() and dsa_master_teardown(). Also add a comment in order for it to be absolutely clear why it is still needed. Fixes: a1ff94c2973c ("net: dsa: stop updating master MTU from master.c") Reported-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Tested-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-23Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-0/+5
Merge in overtime fixes, no conflicts. Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-22net: dsa: fix missing host-filtered multicast addressesVladimir Oltean1-10/+34
DSA ports are stacked devices, so they use dev_mc_add() to sync their address list to their lower interface (DSA master). But they are also hardware devices, so they program those addresses to hardware using the __dev_mc_add() sync and unsync callbacks. Unfortunately both cannot work at the same time, and it seems that the multicast addresses which are already present on the DSA master, like 33:33:00:00:00:01 (added by addrconf.c as in6addr_linklocal_allnodes) are synced to the master via dev_mc_sync(), but not to hardware by __dev_mc_sync(). This happens because both the dev_mc_sync() -> __hw_addr_sync_one() code path, as well as __dev_mc_sync() -> __hw_addr_sync_dev(), operate on the same variable: ha->sync_cnt, in a way that causes the "sync" method (dsa_slave_sync_mc) to no longer be called. To fix the issue we need to work with the API in the way in which it was intended to be used, and therefore, call dev_uc_add() and friends for each individual hardware address, from the sync and unsync callbacks. Fixes: 5e8a1e03aa4d ("net: dsa: install secondary unicast and multicast addresses as host FDB/MDB") Link: https://lore.kernel.org/netdev/20220321163213.lrn5sk7m6grighbl@skbuf/ Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Link: https://lore.kernel.org/r/20220322003701.2056895-1-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-21net: dsa: fix panic on shutdown if multi-chip tree failed to probeVladimir Oltean1-0/+5
DSA probing is atypical because a tree of devices must probe all at once, so out of N switches which call dsa_tree_setup_routing_table() during probe, for (N - 1) of them, "complete" will return false and they will exit probing early. The Nth switch will set up the whole tree on their behalf. The implication is that for (N - 1) switches, the driver binds to the device successfully, without doing anything. When the driver is bound, the ->shutdown() method may run. But if the Nth switch has failed to initialize the tree, there is nothing to do for the (N - 1) driver instances, since the slave devices have not been created, etc. Moreover, dsa_switch_shutdown() expects that the calling @ds has been in fact initialized, so it jumps at dereferencing the various data structures, which is incorrect. Avoid the ensuing NULL pointer dereferences by simply checking whether the Nth switch has previously set "ds->setup = true" for the switch which is currently shutting down. The entire setup is serialized under dsa2_mutex which we already hold. Fixes: 0650bf52b31f ("net: dsa: be compatible with masters which unregister on shutdown") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://lore.kernel.org/r/20220318195443.275026-1-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-17net: dsa: pass extack to dsa_switch_ops :: port_mirror_add()Vladimir Oltean1-1/+2
Drivers might have error messages to propagate to user space, most common being that they support a single mirror port. Propagate the netlink extack so that they can inform user space in a verbal way of their limitations. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-17net: dsa: Handle MST state changesTobias Waldekranz3-8/+86
Add the usual trampoline functionality from the generic DSA layer down to the drivers for MST state changes. When a state changes to disabled/blocking/listening, make sure to fast age any dynamic entries in the affected VLANs (those controlled by the MSTI in question). Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-17net: dsa: Pass VLAN MSTI migration notifications to driverTobias Waldekranz3-1/+23
Add the usual trampoline functionality from the generic DSA layer down to the drivers for VLAN MSTI migrations. Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-17net: dsa: Validate hardware support for MSTTobias Waldekranz3-0/+30
When joining a bridge where MST is enabled, we validate that the proper offloading support is in place, otherwise we fallback to software bridging. When then mode is changed on a bridge in which we are members, we refuse the change if offloading is not supported. At the moment we only check for configurable learning, but this will be further restricted as we support more MST related switchdev events. Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-17Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-0/+1
No conflicts. Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-17net: dsa: Add missing of_node_put() in dsa_port_parse_ofMiaoqian Lin1-0/+1
The device_node pointer is returned by of_parse_phandle() with refcount incremented. We should use of_node_put() on it when done. Fixes: 6d4e5c570c2d ("net: dsa: get port type at parse time") Signed-off-by: Miaoqian Lin <linmq006@gmail.com> Link: https://lore.kernel.org/r/20220316082602.10785-1-linmq006@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2022-03-16net: dsa: Never offload FDB entries on standalone portsTobias Waldekranz1-0/+3
If a port joins a bridge that it can't offload, it will fallback to standalone mode and software bridging. In this case, we never want to offload any FDB entries to hardware either. Previously, for host addresses, we would eventually end up in dsa_port_bridge_host_fdb_add, which would unconditionally dereference dp->bridge and cause a segfault. Fixes: c26933639b54 ("net: dsa: request drivers to perform FDB isolation") Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Link: https://lore.kernel.org/r/20220315233033.1468071-1-tobias@waldekranz.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-14net: dsa: report and change port dscp priority using dcbnlVladimir Oltean1-0/+86
Similar to the port-based default priority, IEEE 802.1Q-2018 allows the Application Priority Table to define QoS classes (0 to 7) per IP DSCP value (0 to 63). In the absence of an app table entry for a packet with DSCP value X, QoS classification for that packet falls back to other methods (VLAN PCP or port-based default). The presence of an app table for DSCP value X with priority Y makes the hardware classify the packet to QoS class Y. As opposed to the default-prio where DSA exposes only a "set" in dsa_switch_ops (because the port-based default is the fallback, it always exists, either implicitly or explicitly), for DSCP priorities we expose an "add" and a "del". The addition of a DSCP entry means trusting that DSCP priority, the deletion means ignoring it. Drivers that already trust (at least some) DSCP values can describe their configuration in dsa_switch_ops :: port_get_dscp_prio(), which is called for each DSCP value from 0 to 63. Again, there can be more than one dcbnl app table entry for the same DSCP value, DSA chooses the one with the largest configured priority. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-14net: dsa: report and change port default priority using dcbnlVladimir Oltean1-0/+137
The port-based default QoS class is assigned to packets that lack a VLAN PCP (or the port is configured to not trust the VLAN PCP), an IP DSCP (or the port is configured to not trust IP DSCP), and packets on which no tc-skbedit action has matched. Similar to other drivers, this can be exposed to user space using the DCB Application Priority Table. IEEE 802.1Q-2018 specifies in Table D-8 - Sel field values that when the Selector is 1, the Protocol ID value of 0 denotes the "Default application priority. For use when application priority is not otherwise specified." The way in which the dcbnl integration in DSA has been designed has to do with its requirements. Andrew Lunn explains that SOHO switches are expected to come with some sort of pre-configured QoS profile, and that it is desirable for this to come pre-loaded into the DSA slave interfaces' DCB application priority table. In the dcbnl design, this is possible because calls to dcb_ieee_setapp() can be initiated by anyone including being self-initiated by this device driver. However, what makes this challenging to implement in DSA is that the DSA core manages the net_devices (effectively hiding them from drivers), while drivers manage the hardware. The DSA core has no knowledge of what individual drivers' QoS policies are. DSA could export to drivers a wrapper over dcb_ieee_setapp() and these could call that function to pre-populate the app priority table, however drivers don't have a good moment in time to do this. The dsa_switch_ops :: setup() method gets called before the net_devices are created (dsa_slave_create), and so is dsa_switch_ops :: port_setup(). What remains is dsa_switch_ops :: port_enable(), but this gets called upon each ndo_open. If we add app table entries on every open, we'd need to remove them on close, to avoid duplicate entry errors. But if we delete app priority entries on close, what we delete may not be the initial, driver pre-populated entries, but rather user-added entries. So it is clear that letting drivers choose the timing of the dcb_ieee_setapp() call is inappropriate. The alternative which was chosen is to introduce hardware-specific ops in dsa_switch_ops, and effectively hide dcbnl details from drivers as well. For pre-populating the application table, dsa_slave_dcbnl_init() will call ds->ops->port_get_default_prio() which is supposed to read from hardware. If the operation succeeds, DSA creates a default-prio app table entry. The method is called as soon as the slave_dev is registered, but before we release the rtnl_mutex. This is done such that user space sees the app table entries as soon as it sees the interface being registered. The fact that we populate slave_dev->dcbnl_ops with a non-NULL pointer changes behavior in dcb_doit() from net/dcb/dcbnl.c, which used to return -EOPNOTSUPP for any dcbnl operation where netdev->dcbnl_ops is NULL. Because there are still dcbnl-unaware DSA drivers even if they have dcbnl_ops populated, the way to restore the behavior is to make all dcbnl_ops return -EOPNOTSUPP on absence of the hardware-specific dsa_switch_ops method. The dcbnl framework absurdly allows there to be more than one app table entry for the same selector and protocol (in other words, more than one port-based default priority). In the iproute2 dcb program, there is a "replace" syntactical sugar command which performs an "add" and a "del" to hide this away. But we choose the largest configured priority when we call ds->ops->port_set_default_prio(), using __fls(). When there is no default-prio app table entry left, the port-default priority is restored to 0. Link: https://patchwork.kernel.org/project/netdevbpf/patch/20210113154139.1803705-2-olteanv@gmail.com/ Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-10Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-3/+3
net/dsa/dsa2.c commit afb3cc1a397d ("net: dsa: unlock the rtnl_mutex when dsa_master_setup() fails") commit e83d56537859 ("net: dsa: replay master state events in dsa_tree_{setup,teardown}_master") https://lore.kernel.org/all/20220307101436.7ae87da0@canb.auug.org.au/ drivers/net/ethernet/intel/ice/ice.h commit 97b0129146b1 ("ice: Fix error with handling of bonding MTU") commit 43113ff73453 ("ice: add TTY for GNSS module for E810T device") https://lore.kernel.org/all/20220310112843.3233bcf1@canb.auug.org.au/ drivers/staging/gdm724x/gdm_lte.c commit fc7f750dc9d1 ("staging: gdm724x: fix use after free in gdm_lte_rx()") commit 4bcc4249b4cf ("staging: Use netif_rx().") https://lore.kernel.org/all/20220308111043.1018a59d@canb.auug.org.au/ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-09net: dsa: tag_rtl8_4: fix typo in modalias nameLuiz Angelo Daros de Luca1-1/+1
DSA_TAG_PROTO_RTL8_4L is not defined. It should be DSA_TAG_PROTO_RTL8_4T. Fixes: cd87fecdedd7 ("net: dsa: tag_rtl8_4: add rtl8_4t trailing variant") Reported-by: Arınç ÜNAL <arinc.unal@arinc9.com> Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Link: https://lore.kernel.org/r/20220309175641.12943-1-luizluca@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-09net: dsa: felix: avoid early deletion of host FDB entriesVladimir Oltean3-18/+62
The Felix driver declares FDB isolation but puts all standalone ports in VID 0. This is mostly problem-free as discussed with Alvin here: https://patchwork.kernel.org/project/netdevbpf/cover/20220302191417.1288145-1-vladimir.oltean@nxp.com/#24763870 however there is one catch. DSA still thinks that FDB entries are installed on the CPU port as many times as there are user ports, and this is problematic when multiple user ports share the same MAC address. Consider the default case where all user ports inherit their MAC address from the DSA master, and then the user runs: ip link set swp0 address 00:01:02:03:04:05 The above will make dsa_slave_set_mac_address() call dsa_port_standalone_host_fdb_add() for 00:01:02:03:04:05 in port 0's standalone database, and dsa_port_standalone_host_fdb_del() for the old address of swp0, again in swp0's standalone database. Both the ->port_fdb_add() and ->port_fdb_del() will be propagated down to the felix driver, which will end up deleting the old MAC address from the CPU port. But this is still in use by other user ports, so we end up breaking unicast termination for them. There isn't a problem in the fact that DSA keeps track of host standalone addresses in the individual database of each user port: some drivers like sja1105 need this. There also isn't a problem in the fact that some drivers choose the same VID/FID for all standalone ports. It is just that the deletion of these host addresses must be delayed until they are known to not be in use any longer, and only the driver has this knowledge. Since DSA keeps these addresses in &cpu_dp->fdbs and &cpu_db->mdbs, it is just a matter of walking over those lists and see whether the same MAC address is present on the CPU port in the port db of another user port. I have considered reusing the generic dsa_port_walk_fdbs() and dsa_port_walk_mdbs() schemes for this, but locking makes it difficult. In the ->port_fdb_add() method and co, &dp->addr_lists_lock is held, but dsa_port_walk_fdbs() also acquires that lock. Also, even assuming that we introduce an unlocked variant of the address iterator, we'd still need some relatively complex data structures, and a void *ctx in the dsa_fdb_walk_cb_t which we don't currently pass, such that drivers are able to figure out, after iterating, whether the same MAC address is or isn't present in the port db of another port. All the above, plus the fact that I expect other drivers to follow the same model as felix where all standalone ports use the same FID, made me conclude that a generic method provided by DSA is necessary: dsa_fdb_present_in_other_db() and the mdb equivalent. Felix calls this from the ->port_fdb_del() handler for the CPU port, when the database was classified to either a port db, or a LAG db. For symmetry, we also call this from ->port_fdb_add(), because if the address was installed once, then installing it a second time serves no purpose: it's already in hardware in VID 0 and it affects all standalone ports. This change moves dsa_db_equal() from switch.c to dsa.c, since it now has one more caller. Fixes: 54c319846086 ("net: mscc: ocelot: enforce FDB isolation when VLAN-unaware") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-09net: dsa: be mostly no-op in dsa_slave_set_mac_address when downVladimir Oltean1-0/+7
Since the slave unicast address is synced to hardware and to the DSA master during dsa_slave_open(), this means that a call to dsa_slave_set_mac_address() while the slave interface is down will result to a call to dsa_port_standalone_host_fdb_del() and to dev_uc_del() for the MAC address while there was no previous dsa_port_standalone_host_fdb_add() or dev_uc_add(). This is a partial revert of the blamed commit below, which was too aggressive. Fixes: 35aae5ab9121 ("net: dsa: remove workarounds for changing master promisc/allmulti only while up") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-09net: dsa: move port lists initialization to dsa_port_touchVladimir Oltean1-10/+8
&cpu_db->fdbs and &cpu_db->mdbs may be uninitialized lists during some call paths of felix_set_tag_protocol(). There was an attempt to avoid calling dsa_port_walk_fdbs() during setup by using a "bool change" in the felix driver, but this doesn't work when the tagging protocol is defined in the device tree, and a change is triggered by DSA at pseudo-runtime: dsa_tree_setup_switches -> dsa_switch_setup -> dsa_switch_setup_tag_protocol -> ds->ops->change_tag_protocol dsa_tree_setup_ports -> dsa_port_setup -> &dp->fdbs and &db->mdbs only get initialized here So it seems like the only way to fix this is to move the initialization of these lists earlier. dsa_port_touch() is called from dsa_switch_touch_ports() which is called from dsa_switch_parse_of(), and this runs completely before dsa_tree_setup(). Similarly, dsa_switch_release_ports() runs after dsa_tree_teardown(). Fixes: f9cef64fa23f ("net: dsa: felix: migrate host FDB and MDB entries when changing tag proto") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-09net: dsa: warn if port lists aren't empty in dsa_port_teardownVladimir Oltean1-16/+3
There has been recent work towards matching each switchdev object addition with a corresponding deletion. Therefore, having elements in the fdbs, mdbs, vlans lists at the time of a shared (DSA, CPU) port's teardown is indicative of a bug somewhere else, and not something that is to be expected. We shouldn't try to silently paper over that. Instead, print a warning and a stack trace. This change is a prerequisite for moving the initialization/teardown of these lists. Make it clear that clearing the lists isn't needed. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-08net: dsa: tag_dsa: Fix tx from VLAN uppers on non-filtering bridgesTobias Waldekranz1-3/+12
In this situation (VLAN filtering disabled on br0): br0.10 / br0 / \ swp0 swp1 When a frame is transmitted from the VLAN upper, the bridge will send it down to one of the switch ports with forward offloading enabled. This will cause tag_dsa to generate a FORWARD tag. Before this change, that tag would have it's VID set to 10, even though VID 10 is not loaded in the VTU. Before the blamed commit, the frame would trigger a VTU miss and be forwarded according to the PVT configuration. Now that all fabric ports are in 802.1Q secure mode, the frame is dropped instead. Therefore, restrict the condition under which we rewrite an 802.1Q tag to a DSA tag. On standalone port's, reuse is always safe since we will always generate FROM_CPU tags in that case. For bridged ports though, we must ensure that VLAN filtering is enabled, which in turn guarantees that the VID in question is loaded into the VTU. Fixes: d352b20f4174 ("net: dsa: mv88e6xxx: Improve multichip isolation of standalone ports") Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com> Tested-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Link: https://lore.kernel.org/r/20220307110548.812455-1-tobias@waldekranz.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2022-03-07net: dsa: return success if there was nothing to doTom Rix1-2/+2
Clang static analysis reports this representative issue dsa.c:486:2: warning: Undefined or garbage value returned to caller return err; ^~~~~~~~~~ err is only set in the loop. If the loop is empty, garbage will be returned. So initialize err to 0 to handle this noop case. Signed-off-by: Tom Rix <trix@redhat.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-06net: dsa: unlock the rtnl_mutex when dsa_master_setup() failsVladimir Oltean1-3/+3
After the blamed commit, dsa_tree_setup_master() may exit without calling rtnl_unlock(), fix that. Fixes: c146f9bc195a ("net: dsa: hold rtnl_mutex when calling dsa_master_{setup,teardown}") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-05net: dsa: tag_rtl8_4: add rtl8_4t trailing variantLuiz Angelo Daros de Luca1-36/+116
Realtek switches supports the same tag both before ethertype or between payload and the CRC. Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com> Reviewed-by: Alvin Šipraga <alsi@bang-olufsen.dk> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-1/+1
net/batman-adv/hard-interface.c commit 690bb6fb64f5 ("batman-adv: Request iflink once in batadv-on-batadv check") commit 6ee3c393eeb7 ("batman-adv: Demote batadv-on-batadv skip error message") https://lore.kernel.org/all/20220302163049.101957-1-sw@simonwunderlich.de/ net/smc/af_smc.c commit 4d08b7b57ece ("net/smc: Fix cleanup when register ULP fails") commit 462791bbfa35 ("net/smc: add sysctl interface for SMC") https://lore.kernel.org/all/20220302112209.355def40@canb.auug.org.au/ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-03net: dsa: make dsa_tree_change_tag_proto actually unwind the tag proto changeVladimir Oltean1-1/+1
The blamed commit said one thing but did another. It explains that we should restore the "return err" to the original "goto out_unwind_tagger", but instead it replaced it with "goto out_unlock". When DSA_NOTIFIER_TAG_PROTO fails after the first switch of a multi-switch tree, the switches would end up not using the same tagging protocol. Fixes: 0b0e2ff10356 ("net: dsa: restore error path of dsa_tree_change_tag_proto") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://lore.kernel.org/r/20220303154249.1854436-1-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-03-03net: dsa: felix: migrate host FDB and MDB entries when changing tag protoVladimir Oltean1-0/+40
The "ocelot" and "ocelot-8021q" tagging protocols make use of different hardware resources, and host FDB entries have different destination ports in the switch analyzer module, practically speaking. So when the user requests a tagging protocol change, the driver must migrate all host FDB and MDB entries from the NPI port (in fact CPU port module) towards the same physical port, but this time used as a regular port. It is pointless for the felix driver to keep a copy of the host addresses, when we can create and export DSA helpers for walking through the addresses that it already needs to keep on the CPU port, for refcounting purposes. felix_classify_db() is moved up to avoid a forward declaration. We pass "bool change" because dp->fdbs and dp->mdbs are uninitialized lists when felix_setup() first calls felix_set_tag_protocol(), so we need to avoid calling dsa_port_walk_fdbs() during probe time. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-03net: dsa: manage flooding on the CPU portsVladimir Oltean1-0/+39
DSA can treat IFF_PROMISC and IFF_ALLMULTI on standalone user ports as signifying whether packets with an unknown MAC DA will be received or not. Since known MAC DAs are handled by FDB/MDB entries, this means that promiscuity is analogous to including/excluding the CPU port from the flood domain of those packets. There are two ways to signal CPU flooding to drivers. The first (chosen here) is to synthesize a call to ds->ops->port_bridge_flags() for the CPU port, with a mask of BR_FLOOD | BR_MCAST_FLOOD. This has the effect of turning on egress flooding on the CPU port regardless of source. The alternative would be to create a new ds->ops->port_host_flood() which is called per user port. Some switches (sja1105) have a flood domain that is managed per {ingress port, egress port} pair, so it would make more sense for this kind of switch to not flood the CPU from port A if just port B requires it. Nonetheless, the sja1105 has other quirks that prevent it from making use of unicast filtering, and without a concrete user making use of this feature, I chose not to implement it. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-03net: dsa: install the primary unicast MAC address as standalone port host FDBVladimir Oltean1-2/+33
To be able to safely turn off CPU flooding for standalone ports, we need to ensure that the dev_addr of each DSA slave interface is installed as a standalone host FDB entry for compatible switches. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-03net: dsa: install secondary unicast and multicast addresses as host FDB/MDBVladimir Oltean3-40/+273
In preparation of disabling flooding towards the CPU in standalone ports mode, identify the addresses requested by upper interfaces and use the new API for DSA FDB isolation to request the hardware driver to offload these as FDB or MDB objects. The objects belong to the user port's database, and are installed pointing towards the CPU port. Because dev_uc_add()/dev_mc_add() is VLAN-unaware, we offload to the port standalone database addresses with VID 0 (also VLAN-unaware). So this excludes switches with global VLAN filtering from supporting unicast filtering, because there, it is possible for a port of a switch to join a VLAN-aware bridge, and this changes the VLAN awareness of standalone ports, requiring VLAN-aware standalone host FDB entries. For the same reason, hellcreek, which requires VLAN awareness in standalone mode, is also exempted from unicast filtering. We create "standalone" variants of dsa_port_host_fdb_add() and dsa_port_host_mdb_add() (and the _del coresponding functions). We also create a separate work item type for handling deferred standalone host FDB/MDB entries compared to the switchdev one. This is done for the purpose of clarity - the procedure for offloading a bridge FDB entry is different than offloading a standalone one, and the switchdev event work handles only FDBs anyway, not MDBs. Deferral is needed for standalone entries because ndo_set_rx_mode runs in atomic context. We could probably optimize things a little by first queuing up all entries that need to be offloaded, and scheduling the work item just once, but the data structures that we can pass through __dev_uc_sync() and __dev_mc_sync() are limiting (there is nothing like a void *priv), so we'd have to keep the list of queued events somewhere in struct dsa_switch, and possibly a lock for it. Too complicated for now. Adding the address to the master is handled by dev_uc_sync(), adding it to the hardware is handled by __dev_uc_sync(). So this is the reason why dsa_port_standalone_host_fdb_add() does not call dev_uc_add(). Not that it had the rtnl_mutex anyway - ndo_set_rx_mode has it, but is atomic. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-03net: dsa: rename the host FDB and MDB methods to contain the "bridge" namespaceVladimir Oltean3-34/+28
We are preparing to add API in port.c that adds FDB and MDB entries that correspond to the port's standalone database. Rename the existing methods to make it clear that the FDB and MDB entries offloaded come from the bridge database. Since the function names lengthen in dsa_slave_switchdev_event_work(), we place "addr" and "vid" in temporary variables, to shorten those. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-03-03net: dsa: remove workarounds for changing master promisc/allmulti only while upVladimir Oltean1-37/+8
Lennert Buytenhek explains in commit df02c6ff2e39 ("dsa: fix master interface allmulti/promisc handling"), dated Nov 2008, that changing the promiscuity of interfaces that are down (here the master) is broken. This fact regarding promisc/allmulti has changed since commit b6c40d68ff64 ("net: only invoke dev->change_rx_flags when device is UP") by Vlad Yasevich, dated Nov 2013. Therefore, DSA now has unnecessary complexity to handle master state transitions from down to up. In fact, syncing the unicast and multicast addresses can happen completely asynchronously to the administrative state changes. This change reduces that complexity by effectively fully reverting commit df02c6ff2e39 ("dsa: fix master interface allmulti/promisc handling"). Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>