- 23 Jul, 2021 9 commits
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Tobias Waldekranz authored
Allow switchdevs to forward frames from the CPU in accordance with the bridge configuration in the same way as is done between bridge ports. This means that the bridge will only send a single skb towards one of the ports under the switchdev's control, and expects the driver to deliver the packet to all eligible ports in its domain. Primarily this improves the performance of multicast flows with multiple subscribers, as it allows the hardware to perform the frame replication. The basic flow between the driver and the bridge is as follows: - When joining a bridge port, the switchdev driver calls switchdev_bridge_port_offload() with tx_fwd_offload = true. - The bridge sends offloadable skbs to one of the ports under the switchdev's control using skb->offload_fwd_mark = true. - The switchdev driver checks the skb->offload_fwd_mark field and lets its FDB lookup select the destination port mask for this packet. v1->v2: - convert br_input_skb_cb::fwd_hwdoms to a plain unsigned long - introduce a static key "br_switchdev_fwd_offload_used" to minimize the impact of the newly introduced feature on all the setups which don't have hardware that can make use of it - introduce a check for nbp->flags & BR_FWD_OFFLOAD to optimize cache line access - reorder nbp_switchdev_frame_mark_accel() and br_handle_vlan() in __br_forward() - do not strip VLAN on egress if forwarding offload on VLAN-aware bridge is being used - propagate errors from .ndo_dfwd_add_station() if not EOPNOTSUPP v2->v3: - replace the solution based on .ndo_dfwd_add_station with a solution based on switchdev_bridge_port_offload - rename BR_FWD_OFFLOAD to BR_TX_FWD_OFFLOAD v3->v4: rebase v4->v5: - make sure the static key is decremented on bridge port unoffload - more function and variable renaming and comments for them: br_switchdev_fwd_offload_used to br_switchdev_tx_fwd_offload br_switchdev_accels_skb to br_switchdev_frame_uses_tx_fwd_offload nbp_switchdev_frame_mark_tx_fwd to nbp_switchdev_frame_mark_tx_fwd_to_hwdom nbp_switchdev_frame_mark_accel to nbp_switchdev_frame_mark_tx_fwd_offload fwd_accel to tx_fwd_offload Signed-off-by:
Tobias Waldekranz <tobias@waldekranz.com> 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>
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git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netDavid S. Miller authored
Conflicts are simple overlapping changes. Signed-off-by: -
David S. Miller authored
Arnd Bergmann says: ==================== remove compat_alloc_user_space() This is the fifth version of my series, now spanning four patches instead of two, with a new approach for handling struct ifreq compatibility after I realized that my earlier approach introduces additional problems. The idea here is to always push down the compat conversion deeper into the call stack: rather than pretending to be native mode with a modified copy of the original data on the user space stack, have the code that actually works on the data understand the difference between native and compat versions. I have spent a long time looking at all drivers that implement an ndo_do_ioctl callback to verify that my assumptions are correct. This has led to a series of ~30 additional patches that I am not including here but will post separately, fixing a number of bugs in SIOCDEVPRIVATE ioctls, removing dead code, and splitting ndo_do_ioctl into multiple new ndo callbacks for private and ethernet specific commands. Arnd Link: https://lore.kernel.org/netdev/20201124151828.169152-1-arnd@kernel.org/ Changes in v6: - Split out and expand linux/compat.h rework - Split ifconf change into two patches - Rebase on latest net-next/master Changes in v5: - Rebase to v5.14-rc2 - Fix a few build issues Changes in v4: - build fix without CONFIG_INET - build fix without CONFIG_COMPAT - style fixes pointed out by hch Changes in v3: - complete rewrite of the series ==================== Signed-off-by: -
Arnd Bergmann authored
compat_ifreq_ioctl() is one of the last users of copy_in_user() and compat_alloc_user_space(), as it attempts to convert the 'struct ifreq' arguments from 32-bit to 64-bit format as used by dev_ioctl() and a couple of socket family specific interpretations. The current implementation works correctly when calling dev_ioctl(), inet_ioctl(), ieee802154_sock_ioctl(), atalk_ioctl(), qrtr_ioctl() and packet_ioctl(). The ioctl handlers for x25, netrom, rose and x25 do not interpret the arguments and only block the corresponding commands, so they do not care. For af_inet6 and af_decnet however, the compat conversion is slightly incorrect, as it will copy more data than the native handler accesses, both of them use a structure that is shorter than ifreq. Replace the copy_in_user() conversion with a pair of accessor functions to read and write the ifreq data in place with the correct length where needed, while leaving the other ones to copy the (already compatible) structures directly. Signed-off-by:
Arnd Bergmann <arnd@arndb.de> Reviewed-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
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Arnd Bergmann authored
The dev_ifconf() calling conventions make compat handling more complicated than necessary, simplify this by moving the in_compat_syscall() check into the function. Signed-off-by:
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Arnd Bergmann authored
Since dynamic registration of the gifconf() helper is only used for IPv4, and this can not be in a loadable module, this can be simplified noticeably by turning it into a direct function call as a preparation for cleaning up the compat handling. Signed-off-by:
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Arnd Bergmann authored
SIOCGIFMAP and SIOCSIFMAP currently require compat_alloc_user_space() and copy_in_user() for compat mode. Move the compat handling into the location where the structures are actually used, to avoid using those interfaces and get a clearer implementation. Reviewed-by:
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Arnd Bergmann authored
The ethtool compat ioctl handling is hidden away in net/socket.c, which introduces a couple of minor oddities: - The implementation may end up diverging, as seen in the RXNFC extension in commit 84a1d9c4 ("net: ethtool: extend RXNFC API to support RSS spreading of filter matches") that does not work in compat mode. - Most architectures do not need the compat handling at all because u64 and compat_u64 have the same alignment. - On x86, the conversion is done for both x32 and i386 user space, but it's actually wrong to do it for x32 and cannot work there. - On 32-bit Arm, it never worked for compat oabi user space, since that needs to do the same conversion but does not. - It would be nice to get rid of both compat_alloc_user_space() and copy_in_user() throughout the kernel. None of these actually seems to be a serious problem that real users are likely to encounter, but fixing all of them actually leads to code that is both shorter and more readable. Signed-off-by:
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Arnd Bergmann authored
Parts of linux/compat.h are under an #ifdef, but we end up using more of those over time, moving things around bit by bit. To get it over with once and for all, make all of this file uncondititonal now so it can be accessed everywhere. There are only a few types left that are in asm/compat.h but not yet in the asm-generic version, so add those in the process. This requires providing a few more types in asm-generic/compat.h that were not already there. The only tricky one is compat_sigset_t, which needs a little help on 32-bit architectures and for x86. Signed-off-by:
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- 22 Jul, 2021 31 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linuxLinus Torvalds authored
Pull arm64 fixes from Will Deacon: "A pair of arm64 fixes for -rc3. The straightforward one is a fix to our firmware calling stub, which accidentally started corrupting the link register on machines with SVE. Since these machines don't really exist yet, it wasn't spotted in -next. The other fix is a revert-and-a-bit of a patch originally intended to allow PTE-level huge mappings for the VMAP area on 32-bit PPC 8xx. A side-effect of this change was that our pXd_set_huge() implementations could be replaced with generic dummy functions depending on the levels of page-table being used, which in turn broke the boot if we fail to create the linear mapping as a result of using these functions to operate on the pgd. Huge thanks to Michael Ellerman for modifying the revert so as not to regress PPC 8xx in terms of functionality. Anyway, that's the background and it's also available in the commit message along with Link tags pointing at all of the fun. Summary: - Fix hang when issuing SMC on SVE-capable system due to clobbered LR - Fix boot failure due to missing block mappings with folded page-table" * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: Revert "mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge" arm64: smccc: Save lr before calling __arm_smccc_sve_check() -
Linus Torvalds authored
Merge tag 'hyperv-fixes-signed-20210722' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux Pull hyperv fixes from Wei Liu: - bug fix from Haiyang for vmbus CPU assignment - revert of a bogus patch that went into 5.14-rc1 * tag 'hyperv-fixes-signed-20210722' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: Revert "x86/hyperv: fix logical processor creation" Drivers: hv: vmbus: Fix duplicate CPU assignments within a device
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git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netLinus Torvalds authored
Pull networking fixes from David Miller: 1) Fix type of bind option flag in af_xdp, from Baruch Siach. 2) Fix use after free in bpf_xdp_link_release(), from Xuan Zhao. 3) PM refcnt imbakance in r8152, from Takashi Iwai. 4) Sign extension ug in liquidio, from Colin Ian King. 5) Mising range check in s390 bpf jit, from Colin Ian King. 6) Uninit value in caif_seqpkt_sendmsg(), from Ziyong Xuan. 7) Fix skb page recycling race, from Ilias Apalodimas. 8) Fix memory leak in tcindex_partial_destroy_work, from Pave Skripkin. 9) netrom timer sk refcnt issues, from Nguyen Dinh Phi. 10) Fix data races aroun tcp's tfo_active_disable_stamp, from Eric Dumazet. 11) act_skbmod should only operate on ethernet packets, from Peilin Ye. 12) Fix slab out-of-bpunds in fib6_nh_flush_exceptions(),, from Psolo Abeni. 13) Fix sparx5 dependencies, from Yajun Deng. * git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (74 commits) dpaa2-switch: seed the buffer pool after allocating the swp net: sched: cls_api: Fix the the wrong parameter net: sparx5: fix unmet dependencies warning net: dsa: tag_ksz: dont let the hardware process the layer 4 checksum net: dsa: ensure linearized SKBs in case of tail taggers ravb: Remove extra TAB ravb: Fix a typo in comment net: dsa: sja1105: make VID 4095 a bridge VLAN too tcp: disable TFO blackhole logic by default sctp: do not update transport pathmtu if SPP_PMTUD_ENABLE is not set net: ixp46x: fix ptp build failure ibmvnic: Remove the proper scrq flush selftests: net: add ESP-in-UDP PMTU test udp: check encap socket in __udp_lib_err sctp: update active_key for asoc when old key is being replaced r8169: Avoid duplicate sysfs entry creation error ixgbe: Fix packet corruption due to missing DMA sync Revert "qed: fix possible unpaired spin_{un}lock_bh in _qed_mcp_cmd_and_union()" ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions fsl/fman: Add fibre support ... -
git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmcLinus Torvalds authored
Pull MMC fixes from Ulf Hansson: - Use kref to fix KASAN splats triggered during card removal - Don't allocate IDA for OF aliases * tag 'mmc-v5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc: mmc: core: Don't allocate IDA for OF aliases mmc: core: Use kref in place of struct mmc_blk_data::usage
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Ioana Ciornei authored
Any interraction with the buffer pool (seeding a buffer, acquire one) is made through a software portal (SWP, a DPIO object). There are circumstances where the dpaa2-switch driver probes on a DPSW before any DPIO devices have been probed. In this case, seeding of the buffer pool will lead to a panic since no SWPs are initialized. To fix this, seed the buffer pool after making sure that the software portals have been probed and are ready to be used. Fixes: 0b1b7137 ("staging: dpaa2-switch: handle Rx path on control interface") Signed-off-by:
Ioana Ciornei <ioana.ciornei@nxp.com> Signed-off-by:
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Niklas Söderlund authored
The return type of the function is bool and while NULL do evaluate to false it's not very nice, fix this by explicitly returning false. There is no functional change. Signed-off-by:
Niklas Söderlund <niklas.soderlund@corigine.com> Signed-off-by:
Louis Peens <louis.peens@corigine.com> Signed-off-by:
Simon Horman <simon.horman@corigine.com> Signed-off-by:
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Matthieu Baerts authored
When compiling without CONFIG_SYSCTL, this warning appears: net/ipv6/addrconf.c:99:12: error: 'ioam6_if_id_max' defined but not used [-Werror=unused-variable] 99 | static u32 ioam6_if_id_max = U16_MAX; | ^~~~~~~~~~~~~~~ cc1: all warnings being treated as errors Simply moving the declaration of this variable under ... #ifdef CONFIG_SYSCTL ... with other similar variables fixes the issue. Fixes: 9ee11f0f ("ipv6: ioam: Data plane support for Pre-allocated Trace") Signed-off-by:Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by:
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David S. Miller authored
Simon Horman says: ==================== nfp: flower: conntrack offload Louis Peens says: This series takes the preparation from previous two series and finally creates the structures and control messages to offload the conntrack flows to the card. First we do a bit of refactoring in the existing functions to make them re-usable for the conntrack implementation, after which the control messages are compiled and transmitted to the card. Lastly we add stats handling for the conntrack flows. ==================== Signed-off-by: -
Louis Peens authored
Add in the logic to update flow stats. The flow stats from the nfp is saved in the flow_pay struct, which is associated with the final merged flow. This saves deltas however, so once read it needs to be cleared. However the flow stats requests from the kernel is from the other side of the chain, and a single tc flow from the kernel can be merged into multiple other tc flows to form multiple offloaded flows. This means that all linked flows needs to be updated for each stats request. Signed-off-by:
Yinjun Zhang <yinjun.zhang@corigine.com> Signed-off-by:
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Louis Peens authored
Add the offload parts (ADD_FLOW/DEL_FLOW) calls to add and delete the flows from the nfp. Signed-off-by:
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Louis Peens authored
Compile the offload flow metadata and add flow_pay to the offload table. Also add in the delete paths. This does not include actual offloading to the card yet, this will follow soon. Signed-off-by:
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Louis Peens authored
Combine the actions from the three different rules into one and convert into the payload format expected by the nfp. Signed-off-by:
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Louis Peens authored
Add in the code to compile match part of the payload that will be sent to the firmware. This works similar to match.c does it, but since three flows needs to be merged it iterates through all three rules in a loop and combine the match fields to get the most strict match as result. Signed-off-by:
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Louis Peens authored
This calculates the correct combined keylayers and key_layer_size for the to-be-offloaded flow. Signed-off-by:
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Louis Peens authored
Change the action related offload functions to take in flow_rule * as input instead of flow_cls_offload * as input. The flow_rule parts of flow_cls_offload is the only part that is used in any case, and this is required for more conntrack offload patches which will follow later. Signed-off-by:
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Louis Peens authored
This is a small cleanup to pass in flow->rule to some of the compile functions instead of extracting it every time. This is will also be useful for conntrack patches later. Signed-off-by:
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Yinjun Zhang authored
Expose and refactor the match compilation functions so that they can be invoked externally. Also update the functions so they can be called multiple times with the results OR'd together. This is applicable for the flows-merging scenario, in which there could be overlapped and non-conflicting match fields. This will be used in upcoming conntrack patches. This is safe to do in the in the single call case as well since both unmasked_data and mask_data gets initialised to 0. Signed-off-by:
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Oleksij Rempel authored
Test if we actually can send/receive packets with MTU size. This kind of issue was detected on ASIX HW with bogus EEPROM. Signed-off-by:
Oleksij Rempel <o.rempel@pengutronix.de> Signed-off-by:
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Oleksij Rempel authored
Add missing stop and let phylib framework suspend attached PHY. Fixes: e532a096 ("net: usb: asix: ax88772: add phylib support") Signed-off-by:
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Oleksij Rempel authored
asix_get_phyid() is used for two reasons here. To print debug message with the PHY ID and to wait until the PHY is powered up. After migrating to the phylib, we can read PHYID from sysfs. If polling for the PHY is really needed, then we will need to handle it in the phylib as well. This change was tested with: - ax88772a + internal PHY - ax88772b + external PHY Signed-off-by:
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Yajun Deng authored
The 4th parameter in tc_chain_notify() should be flags rather than seq. Let's change it back correctly. Fixes: 32a4f5ec ("net: sched: introduce chain object to uapi") Signed-off-by:
Yajun Deng <yajun.deng@linux.dev> Signed-off-by:
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Vladimir Oltean authored
The newly introduced switchdev_handle_fdb_{add,del}_to_device helpers solved a problem but introduced another one. They have a severe design bug: they do not propagate FDB events on foreign interfaces to us, i.e. this use case: br0 / \ / \ / \ / \ swp0 eno0 (switchdev) (foreign) when an address is learned on eno0, what is supposed to happen is that this event should also be propagated towards swp0. Somehow I managed to convince myself that this did work correctly, but obviously it does not. The trouble with foreign interfaces is that we must reach a switchdev net_device pointer through a foreign net_device that has no direct upper/lower relationship with it. So we need to do exploratory searching through the lower interfaces of the foreign net_device's bridge upper (to reach swp0 from eno0, we must check its upper, br0, for lower interfaces that pass the check_cb and foreign_dev_check_cb). This is something that the previous code did not do, it just assumed that "dev" will become a switchdev interface at some point, somehow, probably by magic. With this patch, assisted address learning on the CPU port works again in DSA: ip link add br0 type bridge ip link set swp0 master br0 ip link set eno0 master br0 ip link set br0 up [ 46.708929] mscc_felix 0000:00:00.5 swp0: Adding FDB entry towards eno0, addr 00:04:9f:05:f4:ab vid 0 as host address Fixes: 8ca07176 ("net: switchdev: introduce a fanout helper for SWITCHDEV_FDB_{ADD,DEL}_TO_DEVICE") Reported-by:Eric Woudstra <ericwouds@gmail.com> Signed-off-by:
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Randy Dunlap authored
WARNING: unmet direct dependencies detected for PHY_SPARX5_SERDES Depends on [n]: (ARCH_SPARX5 || COMPILE_TEST [=n]) && OF [=y] && HAS_IOMEM [=y] Selected by [y]: - SPARX5_SWITCH [=y] && NETDEVICES [=y] && ETHERNET [=y] && NET_VENDOR_MICROCHIP [=y] && NET_SWITCHDEV [=y] && HAS_IOMEM [=y] && OF [=y] Signed-off-by:
Randy Dunlap <rdunlap@infradead.org> Cc: Lars Povlsen <lars.povlsen@microchip.com> Cc: Steen Hegelund <Steen.Hegelund@microchip.com> Cc: UNGLinuxDriver@microchip.com Cc: "David S. Miller" <davem@davemloft.net> Cc: Jakub Kicinski <kuba@kernel.org> Signed-off-by:
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David S. Miller authored
Vladimir Oltean says: ==================== Let switchdev drivers offload and unoffload bridge ports at their own convenience This series introduces an explicit API through which switchdev drivers mark a bridge port as offloaded or not: - switchdev_bridge_port_offload() - switchdev_bridge_port_unoffload() Currently, the bridge assumes that a port is offloaded if dev_get_port_parent_id(dev, &ppid, recurse=true) returns something, but that is just an assumption that breaks some use cases (like a non-offloaded LAG interface on top of a switchdev port, bridged with other switchdev ports). Along with some consolidation of the bridge logic to assign a "switchdev offloading mark" to a port (now better called a "hardware domain"), this series allows the bridge driver side to no longer impose restrictions on that configuration. Right now, all switchdev drivers must be modified to use the explicit API, but more and more logic can then be placed centrally in the bridge and therefore ease the job of a switchdev driver writer in the future. For example, the first thing we can hook into the explicit switchdev offloading API calls are the switchdev object and FDB replay helpers. So far, these have only been used by DSA in "pull" mode (where the driver must ask for them). Adding the replay helpers to other drivers involves a lot of repetition. But by moving the helpers inside the bridge port offload/unoffload hook points, we can move the entire replay process to "push" mode (where the bridge provides them automatically). The explicit switchdev offloading API will see further extensions in the future. The patches were split from a larger series for easier review: https://patchwork.kernel.org/project/netdevbpf/cover/20210718214434.3938850-1-vladimir.oltean@nxp.com/ Changes in v6: - Make the switchdev replay helpers opt-in - Opt out of the replay helpers for mlxsw, rocker, prestera, sparx5, cpsw, am65-cpsw ==================== Signed-off-by:
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Vladimir Oltean authored
Starting with commit 4f2673b3 ("net: bridge: add helper to replay port and host-joined mdb entries"), DSA has introduced some bridge helpers that replay switchdev events (FDB/MDB/VLAN additions and deletions) that can be lost by the switchdev drivers in a variety of circumstances: - an IP multicast group was host-joined on the bridge itself before any switchdev port joined the bridge, leading to the host MDB entries missing in the hardware database. - during the bridge creation process, the MAC address of the bridge was added to the FDB as an entry pointing towards the bridge device itself, but with no switchdev ports being part of the bridge yet, this local FDB entry would remain unknown to the switchdev hardware database. - a VLAN/FDB/MDB was added to a bridge port that is a LAG interface, before any switchdev port joined that LAG, leading to the hardware database missing those entries. - a switchdev port left a LAG that is a bridge port, while the LAG remained part of the bridge, and all FDB/MDB/VLAN entries remained installed in the hardware database of the switchdev port. Also, since commit 0d2cfbd4 ("net: bridge: ignore switchdev events for LAG ports which didn't request replay"), DSA introduced a method, based on a const void *ctx, to ensure that two switchdev ports under the same LAG that is a bridge port do not see the same MDB/VLAN entry being replayed twice by the bridge, once for every bridge port that joins the LAG. With so many ordering corner cases being possible, it seems unreasonable to expect a switchdev driver writer to get it right from the first try. Therefore, now that DSA has experimented with the bridge replay helpers for a little bit, we can move the code to the bridge driver where it is more readily available to all switchdev drivers. To convert the switchdev object replay helpers from "pull mode" (where the driver asks for them) to a "push mode" (where the bridge offers them automatically), the biggest problem is that the bridge needs to be aware when a switchdev port joins and leaves, even when the switchdev is only indirectly a bridge port (for example when the bridge port is a LAG upper of the switchdev). Luckily, we already have a hook for that, in the form of the newly introduced switchdev_bridge_port_offload() and switchdev_bridge_port_unoffload() calls. These offer a natural place for hooking the object addition and deletion replays. Extend the above 2 functions with: - pointers to the switchdev atomic notifier (for FDB replays) and the blocking notifier (for MDB and VLAN replays). - the "const void *ctx" argument required for drivers to be able to disambiguate between which port is targeted, when multiple ports are lowers of the same LAG that is a bridge port. Most of the drivers pass NULL to this argument, except the ones that support LAG offload and have the proper context check already in place in the switchdev blocking notifier handler. Also unexport the replay helpers, since nobody except the bridge calls them directly now. Note that: (a) we abuse the terminology slightly, because FDB entries are not "switchdev objects", but we count them as objects nonetheless. With no direct way to prove it, I think they are not modeled as switchdev objects because those can only be installed by the bridge to the hardware (as opposed to FDB entries which can be propagated in the other direction too). This is merely an abuse of terms, FDB entries are replayed too, despite not being objects. (b) the bridge does not attempt to sync port attributes to newly joined ports, just the countable stuff (the objects). The reason for this is simple: no universal and symmetric way to sync and unsync them is known. For example, VLAN filtering: what to do on unsync, disable or leave it enabled? Similarly, STP state, ageing timer, etc etc. What a switchdev port does when it becomes standalone again is not really up to the bridge's competence, and the driver should deal with it. On the other hand, replaying deletions of switchdev objects can be seen a matter of cleanup and therefore be treated by the bridge, hence this patch. We make the replay helpers opt-in for drivers, because they might not bring immediate benefits for them: - nbp_vlan_init() is called _after_ netdev_master_upper_dev_link(), so br_vlan_replay() should not do anything for the new drivers on which we call it. The existing drivers where there was even a slight possibility for there to exist a VLAN on a bridge port before they join it are already guarded against this: mlxsw and prestera deny joining LAG interfaces that are members of a bridge. - br_fdb_replay() should now notify of local FDB entries, but I patched all drivers except DSA to ignore these new entries in commit 2c4eca3e ("net: bridge: switchdev: include local flag in FDB notifications"). Driver authors can lift this restriction as they wish, and when they do, they can also opt into the FDB replay functionality. - br_mdb_replay() should fix a real issue which is described in commit 4f2673b3 ("net: bridge: add helper to replay port and host-joined mdb entries"). However most drivers do not offload the SWITCHDEV_OBJ_ID_HOST_MDB to see this issue: only cpsw and am65_cpsw offload this switchdev object, and I don't completely understand the way in which they offload this switchdev object anyway. So I'll leave it up to these drivers' respective maintainers to opt into br_mdb_replay(). So most of the drivers pass NULL notifier blocks for the replay helpers, except: - dpaa2-switch which was already acked/regression-tested with the helpers enabled (and there isn't much of a downside in having them) - ocelot which already had replay logic in "pull" mode - DSA which already had replay logic in "pull" mode An important observation is that the drivers which don't currently request bridge event replays don't even have the switchdev_bridge_port_{offload,unoffload} calls placed in proper places right now. This was done to avoid unnecessary rework for drivers which might never even add support for this. For driver writers who wish to add replay support, this can be used as a tentative placement guide: https://patchwork.kernel.org/project/netdevbpf/patch/20210720134655.892334-11-vladimir.oltean@nxp.com/ Cc: Vadym Kochan <vkochan@marvell.com> Cc: Taras Chornyi <tchornyi@marvell.com> Cc: Ioana Ciornei <ioana.ciornei@nxp.com> Cc: Lars Povlsen <lars.povlsen@microchip.com> Cc: Steen Hegelund <Steen.Hegelund@microchip.com> Cc: UNGLinuxDriver@microchip.com Cc: Claudiu Manoil <claudiu.manoil@nxp.com> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by:
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Vladimir Oltean authored
There is a desire to make the object and FDB replay helpers optional when moving them inside the bridge driver. For example a certain driver might not offload host MDBs and there is no case where the replay helpers would be of immediate use to it. So it would be nice if we could allow drivers to pass NULL pointers for the atomic and blocking notifier blocks, and the replay helpers to do nothing in that case. Signed-off-by:
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Vladimir Oltean authored
On reception of an skb, the bridge checks if it was marked as 'already forwarded in hardware' (checks if skb->offload_fwd_mark == 1), and if it is, it assigns the source hardware domain of that skb based on the hardware domain of the ingress port. Then during forwarding, it enforces that the egress port must have a different hardware domain than the ingress one (this is done in nbp_switchdev_allowed_egress). Non-switchdev drivers don't report any physical switch id (neither through devlink nor .ndo_get_port_parent_id), therefore the bridge assigns them a hardware domain of 0, and packets coming from them will always have skb->offload_fwd_mark = 0. So there aren't any restrictions. Problems appear due to the fact that DSA would like to perform software fallback for bonding and team interfaces that the physical switch cannot offload. +-- br0 ---+ / / | \ / / | \ / | | bond0 / | | / \ swp0 swp1 swp2 swp3 swp4 There, it is desirable that the presence of swp3 and swp4 under a non-offloaded LAG does not preclude us from doing hardware bridging beteen swp0, swp1 and swp2. The bandwidth of the CPU is often times high enough that software bridging between {swp0,swp1,swp2} and bond0 is not impractical. But this creates an impossible paradox given the current way in which port hardware domains are assigned. When the driver receives a packet from swp0 (say, due to flooding), it must set skb->offload_fwd_mark to something. - If we set it to 0, then the bridge will forward it towards swp1, swp2 and bond0. But the switch has already forwarded it towards swp1 and swp2 (not to bond0, remember, that isn't offloaded, so as far as the switch is concerned, ports swp3 and swp4 are not looking up the FDB, and the entire bond0 is a destination that is strictly behind the CPU). But we don't want duplicated traffic towards swp1 and swp2, so it's not ok to set skb->offload_fwd_mark = 0. - If we set it to 1, then the bridge will not forward the skb towards the ports with the same switchdev mark, i.e. not to swp1, swp2 and bond0. Towards swp1 and swp2 that's ok, but towards bond0? It should have forwarded the skb there. So the real issue is that bond0 will be assigned the same hardware domain as {swp0,swp1,swp2}, because the function that assigns hardware domains to bridge ports, nbp_switchdev_add(), recurses through bond0's lower interfaces until it finds something that implements devlink (calls dev_get_port_parent_id with bool recurse = true). This is a problem because the fact that bond0 can be offloaded by swp3 and swp4 in our example is merely an assumption. A solution is to give the bridge explicit hints as to what hardware domain it should use for each port. Currently, the bridging offload is very 'silent': a driver registers a netdevice notifier, which is put on the netns's notifier chain, and which sniffs around for NETDEV_CHANGEUPPER events where the upper is a bridge, and the lower is an interface it knows about (one registered by this driver, normally). Then, from within that notifier, it does a bunch of stuff behind the bridge's back, without the bridge necessarily knowing that there's somebody offloading that port. It looks like this: ip link set swp0 master br0 | v br_add_if() calls netdev_master_upper_dev_link() | v call_netdevice_notifiers | v dsa_slave_netdevice_event | v oh, hey! it's for me! | v .port_bridge_join What we do to solve the conundrum is to be less silent, and change the switchdev drivers to present themselves to the bridge. Something like this: ip link set swp0 master br0 | v br_add_if() calls netdev_master_upper_dev_link() | v bridge: Aye! I'll use this call_netdevice_notifiers ^ ppid as the | | hardware domain for v | this port, and zero dsa_slave_netdevice_event | if I got nothing. | | v | oh, hey! it's for me! | | | v | .port_bridge_join | | | +------------------------+ switchdev_bridge_port_offload(swp0, swp0) Then stacked interfaces (like bond0 on top of swp3/swp4) would be treated differently in DSA, depending on whether we can or cannot offload them. The offload case: ip link set bond0 master br0 | v br_add_if() calls netdev_master_upper_dev_link() | v bridge: Aye! I'll use this call_netdevice_notifiers ^ ppid as the | | switchdev mark for v | bond0. dsa_slave_netdevice_event | Coincidentally (or not), | | bond0 and swp0, swp1, swp2 v | all have the same switchdev hmm, it's not quite for me, | mark now, since the ASIC but my driver has already | is able to forward towards called .port_lag_join | all these ports in hw. for it, because I have | a port with dp->lag_dev == bond0. | | | v | .port_bridge_join | for swp3 and swp4 | | | +------------------------+ switchdev_bridge_port_offload(bond0, swp3) switchdev_bridge_port_offload(bond0, swp4) And the non-offload case: ip link set bond0 master br0 | v br_add_if() calls netdev_master_upper_dev_link() | v bridge waiting: call_netdevice_notifiers ^ huh, switchdev_bridge_port_offload | | wasn't called, okay, I'll use a v | hwdom of zero for this one. dsa_slave_netdevice_event : Then packets received on swp0 will | : not be software-forwarded towards v : swp1, but they will towards bond0. it's not for me, but bond0 is an upper of swp3 and swp4, but their dp->lag_dev is NULL because they couldn't offload it. Basically we can draw the conclusion that the lowers of a bridge port can come and go, so depending on the configuration of lowers for a bridge port, it can dynamically toggle between offloaded and unoffloaded. Therefore, we need an equivalent switchdev_bridge_port_unoffload too. This patch changes the way any switchdev driver interacts with the bridge. From now on, everybody needs to call switchdev_bridge_port_offload and switchdev_bridge_port_unoffload, otherwise the bridge will treat the port as non-offloaded and allow software flooding to other ports from the same ASIC. Note that these functions lay the ground for a more complex handshake between switchdev drivers and the bridge in the future. For drivers that will request a replay of the switchdev objects when they offload and unoffload a bridge port (DSA, dpaa2-switch, ocelot), we place the call to switchdev_bridge_port_unoffload() strategically inside the NETDEV_PRECHANGEUPPER notifier's code path, and not inside NETDEV_CHANGEUPPER. This is because the switchdev object replay helpers need the netdev adjacency lists to be valid, and that is only true in NETDEV_PRECHANGEUPPER. Cc: Vadym Kochan <vkochan@marvell.com> Cc: Taras Chornyi <tchornyi@marvell.com> Cc: Ioana Ciornei <ioana.ciornei@nxp.com> Cc: Lars Povlsen <lars.povlsen@microchip.com> Cc: Steen Hegelund <Steen.Hegelund@microchip.com> Cc: UNGLinuxDriver@microchip.com Cc: Claudiu Manoil <claudiu.manoil@nxp.com> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: -
Tobias Waldekranz authored
Since hwdoms have only been used thus far for equality comparisons, the bridge has used the simplest possible assignment policy; using a counter to keep track of the last value handed out. With the upcoming transmit offloading, we need to perform set operations efficiently based on hwdoms, e.g. we want to answer questions like "has this skb been forwarded to any port within this hwdom?" Move to a bitmap-based allocation scheme that recycles hwdoms once all members leaves the bridge. This means that we can use a single unsigned long to keep track of the hwdoms that have received an skb. v1->v2: convert the typedef DECLARE_BITMAP(br_hwdom_map_t, BR_HWDOM_MAX) into a plain unsigned long. v2->v6: none Signed-off-by: -
Tobias Waldekranz authored
Before this change, four related - but distinct - concepts where named offload_fwd_mark: - skb->offload_fwd_mark: Set by the switchdev driver if the underlying hardware has already forwarded this frame to the other ports in the same hardware domain. - nbp->offload_fwd_mark: An idetifier used to group ports that share the same hardware forwarding domain. - br->offload_fwd_mark: Counter used to make sure that unique IDs are used in cases where a bridge contains ports from multiple hardware domains. - skb->cb->offload_fwd_mark: The hardware domain on which the frame ingressed and was forwarded. Introduce the term "hardware forwarding domain" ("hwdom") in the bridge to denote a set of ports with the following property: If an skb with skb->offload_fwd_mark set, is received on a port belonging to hwdom N, that frame has already been forwarded to all other ports in hwdom N. By decoupling the name from "offload_fwd_mark", we can extend the term's definition in the future - e.g. to add constraints that describe expected egress behavior - without overloading the meaning of "offload_fwd_mark". - nbp->offload_fwd_mark thus becomes nbp->hwdom. - br->offload_fwd_mark becomes br->last_hwdom. - skb->cb->offload_fwd_mark becomes skb->cb->src_hwdom. The slight change in naming here mandates a slight change in behavior of the nbp_switchdev_frame_mark() function. Previously, it only set this value in skb->cb for packets with skb->offload_fwd_mark true (ones which were forwarded in hardware). Whereas now we always track the incoming hwdom for all packets coming from a switchdev (even for the packets which weren't forwarded in hardware, such as STP BPDUs, IGMP reports etc). As all uses of skb->cb->offload_fwd_mark were already gated behind checks of skb->offload_fwd_mark, this will not introduce any functional change, but it paves the way for future changes where the ingressing hwdom must be known for frames coming from a switchdev regardless of whether they were forwarded in hardware or not (basically, if the skb comes from a switchdev, skb->cb->src_hwdom now always tracks which one). A typical example where this is relevant: the switchdev has a fixed configuration to trap STP BPDUs, but STP is not running on the bridge and the group_fwd_mask allows them to be forwarded. Say we have this setup: br0 / | \ / | \ swp0 swp1 swp2 A BPDU comes in on swp0 and is trapped to the CPU; the driver does not set skb->offload_fwd_mark. The bridge determines that the frame should be forwarded to swp{1,2}. It is imperative that forward offloading is _not_ allowed in this case, as the source hwdom is already "poisoned". Recording the source hwdom allows this case to be handled properly. v2->v3: added code comments v3->v6: none Signed-off-by:Grygorii Strashko <grygorii.strashko@ti.com> Reviewed-by:
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Vladimir Oltean authored
Make more room for some extra code in the NETDEV_PRECHANGEUPPER handler by moving what already exists into a dedicated function. Cc: Ioana Ciornei <ioana.ciornei@nxp.com> Signed-off-by:
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Vladimir Oltean authored
We need to propagate the extack argument for dpaa2_switch_port_bridge_join to use it in a future patch, and it looks like there is already an error message there which is currently printed to the console. Move it over netlink so it is properly transmitted to user space. Cc: Ioana Ciornei <ioana.ciornei@nxp.com> Signed-off-by:
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