- 12 May, 2020 13 commits
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Kunihiko Hayashi authored
Convert the UniPhier AVE4 controller binding to DT schema format. Signed-off-by:
Kunihiko Hayashi <hayashi.kunihiko@socionext.com> Reviewed-by:
Rob Herring <robh@kernel.org> Signed-off-by:
David S. Miller <davem@davemloft.net>
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David S. Miller authored
Shannon Nelson says: ==================== ionic updates This set of patches is a bunch of code cleanup, a little documentation, longer tx sg lists, more ethtool stats, and a couple more transceiver types. ==================== Signed-off-by: -
Shannon Nelson authored
Update the basic doc file with some configuration hints and a little bit of stats information. Signed-off-by:
Shannon Nelson <snelson@pensando.io> Signed-off-by:
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Shannon Nelson authored
Add hardware port stats and a few more driver collected statistics to the ethtool stats output. Signed-off-by:
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Shannon Nelson authored
Fix up a few more local names that need an "ionic" prefix. Signed-off-by:
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Shannon Nelson authored
Change the ionic_intr_free parameter from struct ionic_lif to struct ionic since that's what it actually cares about. Signed-off-by:
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Shannon Nelson authored
Once we're talking to the device, tell it to reset to be sure we've got a fresh, clean environment. Signed-off-by:
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Shannon Nelson authored
Shorten our msleep time while polling for the dev command request to finish. Yes, checkpatch.pl complains that the msleep might actually go longer - that won't hurt, but we'll take the shorter time if we can get it. Signed-off-by:
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Shannon Nelson authored
Add a couple more SFP and QSFP transceiver types to our ethtool get link ksettings. Signed-off-by:
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Shannon Nelson authored
When going into a firmware upgrade cycle, we set the device as not present to keep some user commands from trying to change the driver while we're only half there. Unfortunately, the ndo_vf_* calls don't check netif_device_present() so we need to add a check in the callbacks. Signed-off-by:
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Shannon Nelson authored
Lots of comment cleanup for better documentation, a few new fields added, and a few minor mistakes fixed up. Signed-off-by:
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Shannon Nelson authored
The version 1 Tx queues can use longer SG lists than the original version 0 queues, but we need to check to see if the firmware supports the v1 Tx queues. This implements the queue type query for all queue types, and uses the information to set up for using the longer Tx SG lists. Because the Tx SG list can be longer, we need to limit the max ring length to be sure we stay inside the boundaries of a DMA allocation max size, so we lower the max Tx ring size. The driver sets its highest known version in the Q_IDENTITY command, and the FW returns the highest version that it knows, bounded by the driver's version. The negotiated version number is later used in the Q_INIT commands. Signed-off-by:
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Jakub Kicinski authored
ENOTSUPP often feels like the right error code to use, but it's in fact not a standard Unix error. E.g.: $ python >>> import errno >>> errno.errorcode[errno.ENOTSUPP] Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: module 'errno' has no attribute 'ENOTSUPP' There were numerous commits converting the uses back to EOPNOTSUPP but in some cases we are stuck with the high error code for backward compatibility reasons. Let's try prevent more ENOTSUPPs from getting into the kernel. Recent example: https://lore.kernel.org/netdev/20200510182252.GA411829@lunn.ch/ v3 (Joe): - fix the "not file" condition. v2 (Joe): - add a link to recent discussion, - don't match when scanning files, not patches to avoid sudden influx of conversion patches. https://lore.kernel.org/netdev/20200511165319.2251678-1-kuba@kernel.org/ v1: https://lore.kernel.org/netdev/20200510185148.2230767-1-kuba@kernel.org/Suggested-by:
Andrew Lunn <andrew@lunn.ch> Signed-off-by:
Jakub Kicinski <kuba@kernel.org> Acked-by:
Joe Perches <joe@perches.com> Signed-off-by:
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- 11 May, 2020 27 commits
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David S. Miller authored
Christoph Hellwig says: ==================== improve msg_control kernel vs user pointer handling this series replace the msg_control in the kernel msghdr structure with an anonymous union and separate fields for kernel vs user pointers. In addition to helping a bit with type safety and reducing sparse warnings, this also allows to remove the set_fs() in kernel_recvmsg, helping with an eventual entire removal of set_fs(). ==================== Signed-off-by: -
Christoph Hellwig authored
The msg_control field in struct msghdr can either contain a user pointer when used with the recvmsg system call, or a kernel pointer when used with sendmsg. To complicate things further kernel_recvmsg can stuff a kernel pointer in and then use set_fs to make the uaccess helpers accept it. Replace it with a union of a kernel pointer msg_control field, and a user pointer msg_control_user one, and allow kernel_recvmsg operate on a proper kernel pointer using a bitfield to override the normal choice of a user pointer for recvmsg. Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
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Christoph Hellwig authored
Factor out two helpes to keep the code tidy. Signed-off-by:
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Christoph Hellwig authored
Add a variant of CMSG_DATA that operates on user pointer to avoid sparse warnings about casting to/from user pointers. Also fix up CMSG_DATA to rely on the gcc extension that allows void pointer arithmetics to cut down on the amount of casts. Signed-off-by:
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David S. Miller authored
Florian Fainelli says: ==================== net: dsa: Constify two tagger ops This patch series constifies the dsa_device_ops for ocelot and sja1105 ==================== Signed-off-by: -
Florian Fainelli authored
sja1105_netdev_ops should be const since that is what the DSA layer expects. Signed-off-by:
Florian Fainelli <f.fainelli@gmail.com> Signed-off-by:
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Florian Fainelli authored
ocelot_netdev_ops should be const since that is what the DSA layer expects. Signed-off-by:
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David S. Miller authored
Edward Cree says: ==================== sfc: remove nic_data usage in common code efx->nic_data should only be used from NIC-specific code (i.e. nic_type functions and things they call), in files like ef10[_sriov].c and siena.c. This series refactors several nic_data usages from common code (mainly in mcdi_filters.c) into nic_type functions, in preparation for the upcoming ef100 driver which will use those functions but have its own struct layout for efx->nic_data distinct from ef10's. After this series, one nic_data usage (in ptp.c) remains; it wasn't clear to me how to fix it, and ef100 devices don't yet have PTP support (so the initial ef100 driver will not call that code). ==================== Signed-off-by: -
Edward Cree authored
Instead of having efx_mcdi_print_fwver() look at efx_nic_rev and conditionally poke around inside ef10-specific nic_data, add a new efx->type->print_additional_fwver() method to do this work. Signed-off-by:
Edward Cree <ecree@solarflare.com> Signed-off-by:
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Edward Cree authored
By making the caller of efx_mcdi_filter_table_probe() loop over the vlan_list calling efx_mcdi_filter_add_vlan(), instead of doing it in efx_mcdi_filter_table_probe(), the latter avoids looking in ef10- specific nic_data. Signed-off-by:
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Edward Cree authored
It's both set and used solely by mcdi_filters.c, so there's no reason for it to be in ef10-specific nic_data. Signed-off-by:
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Edward Cree authored
Store the mc_chaining bit in struct efx_mcdi_filter_table, so that common code in mcdi_filters.c doesn't need to get it from ef10-specific nic_data. Also, probe the firmware workaround just before the call to efx_mcdi_filter_table_probe(), rather than in a random other part of the driver bringup, to ensure that (a) it gets probed in time and (b) it gets reprobed as necessary on resets, no matter how the surrounding code gets reorganised and reordered. Signed-off-by:
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Edward Cree authored
Common code in mcdi_filters.c uses these flags, so by moving them to either struct efx_nic (in the case of must_realloc_vis) or struct efx_mcdi_filter_table (for must_restore_rss_contexts and must_restore_filters), decouple this code from ef10's nic_data. Signed-off-by:
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Edward Cree authored
Removes some efx_ef10_nic_data references from common code. Signed-off-by:
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Tom Zhao authored
Various MCDI functions (especially in filter handling) need to check the datapath caps, but those live in nic_data (since they don't exist on Siena). Decouple from ef10-specific data structures by adding check_caps to the nic_type, to allow using these functions from non-ef10 drivers. Also add a convenience macro efx_has_cap() to reduce the amount of boilerplate involved in calling it. Signed-off-by:
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Edward Cree authored
Remove some usage of ef10-specific nic_data structs from common MCDI functions, in preparation for using them from a non-EF10 driver. Signed-off-by:
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David S. Miller authored
Bhupesh Sharma says: ==================== net: Optimize the qed* allocations inside kdump kernel Changes since v1: ---------------- - v1 can be seen here: http://lists.infradead.org/pipermail/kexec/2020-May/024935.html - Addressed review comments received on v1: * Removed unnecessary paranthesis. * Used a different macro for minimum RX/TX ring count value in kdump kernel. Since kdump kernel(s) run under severe memory constraint with the basic idea being to save the crashdump vmcore reliably when the primary kernel panics/hangs, large memory allocations done by a network driver can cause the crashkernel to panic with OOM. The qed* drivers take up approximately 214MB memory when run in the kdump kernel with the default configuration settings presently used in the driver. With an usual crashkernel size of 512M, this allocation is equal to almost half of the total crashkernel size allocated. See some logs obtained via memstrack tool (see [1]) below: dracut-pre-pivot[676]: ======== Report format module_summary: ======== dracut-pre-pivot[676]: Module qed using 149.6MB (2394 pages), peak allocation 149.6MB (2394 pages) dracut-pre-pivot[676]: Module qede using 65.3MB (1045 pages), peak allocation 65.3MB (1045 pages) This patchset tries to reduce the overall memory allocation profile of the qed* driver when they run in the kdump kernel. With these optimization we can see a saving of approx 85M in the kdump kernel: dracut-pre-pivot[671]: ======== Report format module_summary: ======== dracut-pre-pivot[671]: Module qed using 124.6MB (1993 pages), peak allocation 124.7MB (1995 pages) <..snip..> dracut-pre-pivot[671]: Module qede using 4.6MB (73 pages), peak allocation 4.6MB (74 pages) And the kdump kernel can save vmcore successfully via both ssh and nfs interfaces. This patchset contains two patches: [PATCH 1/2] - Reduces the default TX and RX ring count in kdump kernel. [PATCH 2/2] - Disables qed SRIOV feature in kdump kernel (as it is normally not a supported kdump target for saving vmcore). [1]. Memstrack tool: https://github.com/ryncsn/memstrack ==================== Signed-off-by:
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Bhupesh Sharma authored
Since we have kdump kernel(s) running under severe memory constraint it makes sense to disable the qed SRIOV functionality when running the kdump kernel as kdump configurations on several distributions don't support SRIOV targets for saving the vmcore (see [1] for example). Currently the qed SRIOV functionality ends up consuming memory in the kdump kernel, when we don't really use the same. An example log seen in the kdump kernel with the SRIOV functionality enabled can be seen below (obtained via memstrack tool, see [2]): dracut-pre-pivot[676]: ======== Report format module_summary: ======== dracut-pre-pivot[676]: Module qed using 149.6MB (2394 pages), peak allocation 149.6MB (2394 pages) This patch disables the SRIOV functionality inside kdump kernel and with the same applied the memory consumption goes down: dracut-pre-pivot[671]: ======== Report format module_summary: ======== dracut-pre-pivot[671]: Module qed using 124.6MB (1993 pages), peak allocation 124.7MB (1995 pages) [1]. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/managing_monitoring_and_updating_the_kernel/installing-and-configuring-kdump_managing-monitoring-and-updating-the-kernel#supported-kdump-targets_supported-kdump-configurations-and-targets [2]. Memstrack tool: https://github.com/ryncsn/memstrack Cc: kexec@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: Ariel Elior <aelior@marvell.com> Cc: GR-everest-linux-l2@marvell.com Cc: Manish Chopra <manishc@marvell.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by:
Bhupesh Sharma <bhsharma@redhat.com> Signed-off-by:
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Bhupesh Sharma authored
Normally kdump kernel(s) run under severe memory constraint with the basic idea being to save the crashdump vmcore reliably when the primary kernel panics/hangs. Currently the qed* ethernet driver ends up consuming a lot of memory in the kdump kernel, leading to kdump kernel panic when one tries to save the vmcore via ssh/nfs (thus utilizing the services of the underlying qed* network interfaces). An example OOM message log seen in the kdump kernel can be seen here [1], with crashkernel size reservation of 512M. Using tools like memstrack (see [2]), we can track the modules taking up the bulk of memory in the kdump kernel and organize the memory usage output as per 'highest allocator first'. An example log for the OOM case indicates that the qed* modules end up allocating approximately 216M memory, which is a large part of the total crashkernel size: dracut-pre-pivot[676]: ======== Report format module_summary: ======== dracut-pre-pivot[676]: Module qed using 149.6MB (2394 pages), peak allocation 149.6MB (2394 pages) dracut-pre-pivot[676]: Module qede using 65.3MB (1045 pages), peak allocation 65.3MB (1045 pages) This patch reduces the default RX and TX ring count from 1024 to 64 when running inside kdump kernel, which leads to a significant memory saving. An example log with the patch applied shows the reduced memory allocation in the kdump kernel: dracut-pre-pivot[674]: ======== Report format module_summary: ======== dracut-pre-pivot[674]: Module qed using 141.8MB (2268 pages), peak allocation 141.8MB (2268 pages) <..snip..> [dracut-pre-pivot[674]: Module qede using 4.8MB (76 pages), peak allocation 4.9MB (78 pages) Tested crashdump vmcore save via ssh/nfs protocol using underlying qed* network interface after applying this patch. [1] OOM log: ------------ kworker/0:6: page allocation failure: order:6, mode:0x60c0c0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null) kworker/0:6 cpuset=/ mems_allowed=0 CPU: 0 PID: 145 Comm: kworker/0:6 Not tainted 4.18.0-109.el8.aarch64 #1 Hardware name: To be filled by O.E.M. Saber/Saber, BIOS 0ACKL025 01/18/2019 Workqueue: events work_for_cpu_fn Call trace: dump_backtrace+0x0/0x188 show_stack+0x24/0x30 dump_stack+0x90/0xb4 warn_alloc+0xf4/0x178 __alloc_pages_nodemask+0xcac/0xd58 alloc_pages_current+0x8c/0xf8 kmalloc_order_trace+0x38/0x108 qed_iov_alloc+0x40/0x248 [qed] qed_resc_alloc+0x224/0x518 [qed] qed_slowpath_start+0x254/0x928 [qed] __qede_probe+0xf8/0x5e0 [qede] qede_probe+0x68/0xd8 [qede] local_pci_probe+0x44/0xa8 work_for_cpu_fn+0x20/0x30 process_one_work+0x1ac/0x3e8 worker_thread+0x44/0x448 kthread+0x130/0x138 ret_from_fork+0x10/0x18 Cannot start slowpath qede: probe of 0000:05:00.1 failed with error -12 [2]. Memstrack tool: https://github.com/ryncsn/memstrack Cc: kexec@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: Ariel Elior <aelior@marvell.com> Cc: GR-everest-linux-l2@marvell.com Cc: Manish Chopra <manishc@marvell.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by:
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Luo bin authored
add set_link_ksettings implementation and improve the implementation of get_link_ksettings Signed-off-by:
Luo bin <luobin9@huawei.com> Signed-off-by:
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Gustavo A. R. Silva authored
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] sizeof(flexible-array-member) triggers a warning because flexible array members have incomplete type[1]. There are some instances of code in which the sizeof operator is being incorrectly/erroneously applied to zero-length arrays and the result is zero. Such instances may be hiding some bugs. So, this work (flexible-array member conversions) will also help to get completely rid of those sorts of issues. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732 ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by:Gustavo A. R. Silva <gustavoars@kernel.org> Signed-off-by:
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Gustavo A. R. Silva authored
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] sizeof(flexible-array-member) triggers a warning because flexible array members have incomplete type[1]. There are some instances of code in which the sizeof operator is being incorrectly/erroneously applied to zero-length arrays and the result is zero. Such instances may be hiding some bugs. So, this work (flexible-array member conversions) will also help to get completely rid of those sorts of issues. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732 ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: -
Gustavo A. R. Silva authored
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] sizeof(flexible-array-member) triggers a warning because flexible array members have incomplete type[1]. There are some instances of code in which the sizeof operator is being incorrectly/erroneously applied to zero-length arrays and the result is zero. Such instances may be hiding some bugs. So, this work (flexible-array member conversions) will also help to get completely rid of those sorts of issues. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732 ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: -
Jakub Kicinski authored
Vladimir Oltean says: ==================== This series adds support for boards where DSA switches of multiple types are cascaded together. Actually this type of setup was brought up before on netdev, and it looks like utilizing disjoint trees is the way to go: https://lkml.org/lkml/2019/7/7/225 The trouble with disjoint trees (prior to this patch series) is that only bridging of ports within the same hardware switch can be offloaded. After scratching my head for a while, it looks like the easiest way to support hardware bridging between different DSA trees is to bridge their DSA masters and extend the crosschip bridging operations. I have given some thought to bridging the DSA masters with the slaves themselves, but given the hardware topology described in the commit message of patch 4/4, virtually any number (and combination) of bridges (forwarding domains) can be created on top of those 3x4-port front-panel switches. So it becomes a lot less obvious, when the front-panel ports are enslaved to more than 1 bridge, which bridge should the DSA masters be enslaved to. So the least awkward approach was to just create a completely separate bridge for the DSA masters, whose entire purpose is to permit hardware forwarding between the discrete switches beneath it. This is a direct resend of v3, which was deferred due to lack of review. In the meantime Florian has reviewed and tested some of them. v1 was submitted here: https://patchwork.ozlabs.org/project/netdev/cover/20200429161952.17769-1-olteanv@gmail.com/ v2 was submitted here: https://patchwork.ozlabs.org/project/netdev/cover/20200430202542.11797-1-olteanv@gmail.com/ v3 was submitted here: https://patchwork.ozlabs.org/project/netdev/cover/20200503221228.10928-1-olteanv@gmail.com/ ==================== Signed-off-by:
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Vladimir Oltean authored
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:
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Vladimir Oltean authored
Somewhat similar to dsa_tree_find, dsa_switch_find returns a dsa_switch structure pointer by searching for its tree index and switch index (the parameters from dsa,member). To be used, for example, by drivers who implement .crosschip_bridge_join and need a reference to the other switch indicated to by the tree_index and sw_index arguments. Signed-off-by:
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Vladimir Oltean authored
One way of utilizing DSA is by cascading switches which do not all have compatible taggers. Consider the following real-life topology: +---------------------------------------------------------------+ | LS1028A | | +------------------------------+ | | | DSA master for Felix | | | |(internal ENETC port 2: eno2))| | | +------------+------------------------------+-------------+ | | | Felix embedded L2 switch | | | | | | | | +--------------+ +--------------+ +--------------+ | | | | |DSA master for| |DSA master for| |DSA master for| | | | | | SJA1105 1 | | SJA1105 2 | | SJA1105 3 | | | | | |(Felix port 1)| |(Felix port 2)| |(Felix port 3)| | | +--+-+--------------+---+--------------+---+--------------+--+--+ +-----------------------+ +-----------------------+ +-----------------------+ | SJA1105 switch 1 | | SJA1105 switch 2 | | SJA1105 switch 3 | +-----+-----+-----+-----+ +-----+-----+-----+-----+ +-----+-----+-----+-----+ |sw1p0|sw1p1|sw1p2|sw1p3| |sw2p0|sw2p1|sw2p2|sw2p3| |sw3p0|sw3p1|sw3p2|sw3p3| +-----+-----+-----+-----+ +-----+-----+-----+-----+ +-----+-----+-----+-----+ The above can be described in the device tree as follows (obviously not complete): mscc_felix { dsa,member = <0 0>; ports { port@4 { ethernet = <&enetc_port2>; }; }; }; sja1105_switch1 { dsa,member = <1 1>; ports { port@4 { ethernet = <&mscc_felix_port1>; }; }; }; sja1105_switch2 { dsa,member = <2 2>; ports { port@4 { ethernet = <&mscc_felix_port2>; }; }; }; sja1105_switch3 { dsa,member = <3 3>; ports { port@4 { ethernet = <&mscc_felix_port3>; }; }; }; Basically we instantiate one DSA switch tree for every hardware switch in the system, but we still give them globally unique switch IDs (will come back to that later). Having 3 disjoint switch trees makes the tagger drivers "just work", because net devices are registered for the 3 Felix DSA master ports, and they are also DSA slave ports to the ENETC port. So packets received on the ENETC port are stripped of their stacked DSA tags one by one. Currently, hardware bridging between ports on the same sja1105 chip is possible, but switching between sja1105 ports on different chips is handled by the software bridge. This is fine, but we can do better. In fact, the dsa_8021q tag used by sja1105 is compatible with cascading. In other words, a sja1105 switch can correctly parse and route a packet containing a dsa_8021q tag. So if we could enable hardware bridging on the Felix DSA master ports, cross-chip bridging could be completely offloaded. Such as system would be used as follows: ip link add dev br0 type bridge && ip link set dev br0 up for port in sw0p0 sw0p1 sw0p2 sw0p3 \ sw1p0 sw1p1 sw1p2 sw1p3 \ sw2p0 sw2p1 sw2p2 sw2p3; do ip link set dev $port master br0 done The above makes switching between ports on the same row be performed in hardware, and between ports on different rows in software. Now assume the Felix switch ports are called swp0, swp1, swp2. By running the following extra commands: ip link add dev br1 type bridge && ip link set dev br1 up for port in swp0 swp1 swp2; do ip link set dev $port master br1 done the CPU no longer sees packets which traverse sja1105 switch boundaries and can be forwarded directly by Felix. The br1 bridge would not be used for any sort of traffic termination. For this to work, we need to give drivers an opportunity to listen for bridging events on DSA trees other than their own, and pass that other tree index as argument. I have made the assumption, for the moment, that the other existing DSA notifiers don't need to be broadcast to other trees. That assumption might turn out to be incorrect. But in the meantime, introduce a dsa_broadcast function, similar in purpose to dsa_port_notify, which is used only by the bridging notifiers. Signed-off-by:
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