- 20 Jul, 2016 40 commits
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Jacob Keller authored
It turns out that sometimes during a reset the Tx queues will be temporarily stuck longer than .stop_hw() expects. Work around this issue by attempting to .stop_hw() first. If it tails, wait a number of attempts until the Tx queues appear to be drained. After this, attempt stop_hw() again. This ensures that we avoid waiting if we don't need to, such as during the first initialization of a VF, and give the proper amount of time necessary to recover from most situations. It is possible that the hardware is actually stuck. For PFs, this is usually fixed by a datapath reset. Unfortunately the VF cannot request a similar reset for itself. Signed-off-by:
Jacob Keller <jacob.e.keller@intel.com> Tested-by:
Krishneil Singh <Krishneil.k.singh@intel.com> Signed-off-by:
Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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Jacob Keller authored
When stop_hw() routine fails with FM10K_ERR_REQUESTS_PENDING, this indicates that the Tx or Rx queues did not shutdown within the time limit. Print a more suitable message at the dev_info level instead of dev_err. Signed-off-by:
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Jacob Keller authored
Signed-off-by:
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Jacob Keller authored
A while ago, an additional check for the switch being ready was added to reset_hw. A recent refactor accidentally made this check return an error code on failure which caused fm10k_probe to fail when the switch wasn't brought up first. The original reasoning for the check was to prevent additional data path reset when the fabric wasn't ready yet. However, there isn't a compelling reason to keep the check, as the data path reset will restore hardware to a known good state. Remove the check and perform the data path reset regardless of the switch manager state. An alternative fix is to return FM10K_SUCCESS instead, and bypass the actual data path reset. This should be fine as we will perform a reset_hw once the switch is active. However, since data path reset will reset many parts of the hardware it seems better to just perform the reset regardless of switch state. Signed-off-by:
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Jacob Keller authored
Don't report FM10K_ERR_REQUESTS_PENDING when we fail to disable queues within the timeout. This can occur due to a hardware Tx hang, or when the switch ethernet fabric is resetting while we are transmitting traffic. It can sometimes take up to 500ms before the Tx DMA engine gives up. Instead, just skip the DMA engine check and perform a data-path reset anyways. Add a statistic counter to keep track of the number of resets occurring while we have pending DMA on the rings. In order to prevent having to re-assign err to 0, re-order the last few items of the reset_hw_pf function so that we don't perform "return err" at the end. Signed-off-by:
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Ngai-Mint Kwan authored
When a data path reset is initiated, write control to the PCIE_GMBX is yanked from the switch manager. The switch manager writes to this register to clear mailbox global interrupt bits as part of its mailbox interrupt handling routine. When the device recovers from the data path reset and these bits are not cleared, it will prevent future mailbox global interrupts from being triggered. Upon confirming that the device has exited from a data path reset, clear these bits to ensure the proper functioning of the mailbox global interrupt. Signed-off-by:
Ngai-Mint Kwan <ngai-mint.kwan@intel.com> Signed-off-by:
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Jacob Keller authored
Also prevent updating stats while the interface is down. If we're already updating stats, just return doing nothing. When we take the device down, block stat updates until we come back up. This ensures that we avoid tearing down rings when we're updating statistics, and prevents updating statistics until we're up. We can't re-use the __FM10K_DOWN for this because it wouldn't prevent multiple threads from accessing statistics. Neither does it prevent the case where we start updating stats and then start going down in another thread. The fm10k_get_stats64 is except from this, because it has a completely different flow which does not suffer from the same issues as fm10k_update_stats might. Signed-off-by:
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Jacob Keller authored
It's currently possible for fm10k_update_stats to be called during the window when we go down and the rings are removed. This can result in a null pointer dereference. In fm10k_get_stats64 we work around this by using ACCESS_ONCE and a null pointer check inside the loop. Use this same flow in the fm10k_update_stats to avoid the potential null pointer. Signed-off-by:
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Jacob Keller authored
Return early from fm10k_down() when we are already down, since that means another thread is either already finished or has started going down, so shouldn't conflict with them. Signed-off-by:
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David S. Miller authored
Jiri Pirko says: ==================== mlxsw: Add per-{Prio,TC} counters Ido says: Add per-priority and per-tc counters, which are very useful for debugging purposes and fine-tuning. ==================== Signed-off-by:David S. Miller <davem@davemloft.net>
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Ido Schimmel authored
Expose the transmit queue length of each traffic class and the amount of unicast packets discarded due to insufficient room in the shared buffer. The first counter allows us to debug user priority to traffic class mapping, whereas the drop counter is useful when determining shared buffer configuration. Signed-off-by:
Ido Schimmel <idosch@mellanox.com> Signed-off-by:
Jiri Pirko <jiri@mellanox.com> Signed-off-by:
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Ido Schimmel authored
Expose per-priority bytes / packets / PFC packets counters via ethtool. These counters are very useful when debugging QoS functionality and provide a better insight into the device's forwarding plane. Signed-off-by:
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Wei Yongjun authored
Add the missing free_netdev() before return from function cpmac_probe() in the error handling case. This patch revert commit 0465be8f ("net: cpmac: fix in releasing resources"), which changed to only free_netdev while register_netdev failed. Signed-off-by:
Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by:
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Wei Yongjun authored
Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR. Generated by: scripts/coccinelle/api/ptr_ret.cocci Signed-off-by:
Leon Romanovsky <leonro@mellanox.com> Signed-off-by:
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Wei Yongjun authored
In ops->reset() error handling case, clk_disable_unprepare() is missed before return from this function. Signed-off-by:
Mans Rullgard <mans@mansr.com> Signed-off-by:
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Wei Yongjun authored
module_platform_driver() makes the code simpler by eliminating boilerplate code. Signed-off-by:
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Wei Yongjun authored
Remove .owner field if calls are used which set it automatically. Generated by: scripts/coccinelle/api/platform_no_drv_owner.cocci Signed-off-by:
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Wei Yongjun authored
In case of error, the function of_parse_phandle() returns NULL pointer not ERR_PTR(). The IS_ERR() test in the return value check should be replaced with NULL test. Fixes: 46aa27df ('net: axienet: Use devm_* calls') Signed-off-by:
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David S. Miller authored
Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next Johan Hedberg says: ==================== pull request: bluetooth-next 2016-07-19 Here's likely the last bluetooth-next pull request for the 4.8 kernel: - Fix for L2CAP setsockopt - Fix for is_suspending flag handling in btmrvl driver - Addition of Bluetooth HW & FW info fields to debugfs - Fix to use int instead of char for callback status. The last one (from Geert Uytterhoeven) is actually not purely a Bluetooth (or 802.15.4) patch, but it was agreed with other maintainers that we take it through the bluetooth-next tree. Please let me know if there are any issues pulling. Thanks. ==================== Signed-off-by:
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Daniel Borkmann authored
Add the official BPF ELF e_machine value that was assigned recently [1,2] and will be propagated to glibc, et al. LLVM is switching to it in 3.9 release. [1] https://github.com/llvm-mirror/llvm/commit/36b9c09330bfb5e771914cfe307588f30d5510d2 [2] http://lists.iovisor.org/pipermail/iovisor-dev/2016-June/000266.htmlSigned-off-by:
Daniel Borkmann <daniel@iogearbox.net> Acked-by:
Alexei Starovoitov <ast@kernel.org> Signed-off-by:
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Brenden Blanco authored
For the ifndef case of CONFIG_BPF_SYSCALL, an inline version of bpf_prog_add needs to exist otherwise the build breaks on some configs. drivers/net/ethernet/mellanox/mlx4/en_netdev.c:2544:10: error: implicit declaration of function 'bpf_prog_add' prog = bpf_prog_add(prog, priv->rx_ring_num - 1); The function is introduced in 59d3656d ("bpf: add bpf_prog_add api for bulk prog refcnt") and first used in 47f1afdba2b87 ("net/mlx4_en: add support for fast rx drop bpf program"). Fixes: 47f1afdba2b87 ("net/mlx4_en: add support for fast rx drop bpf program") Reported-by:kbuild test robot <fengguang.wu@intel.com> Reported-by:
Tariq Toukan <ttoukan.linux@gmail.com> Signed-off-by:
Brenden Blanco <bblanco@plumgrid.com> Acked-by:
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David S. Miller authored
Brenden Blanco says: ==================== Add driver bpf hook for early packet drop and forwarding This patch set introduces new infrastructure for programmatically processing packets in the earliest stages of rx, as part of an effort others are calling eXpress Data Path (XDP) [1]. Start this effort by introducing a new bpf program type for early packet filtering, before even an skb has been allocated. Extend on this with the ability to modify packet data and send back out on the same port. Patch 1 adds an API for bulk bpf prog refcnt incrememnt. Patch 2 introduces the new prog type and helpers for validating the bpf program. A new userspace struct is defined containing only data and data_end as fields, with others to follow in the future. In patch 3, create a new ndo to pass the fd to supported drivers. In patch 4, expose a new rtnl option to userspace. In patch 5, enable support in mlx4 driver. In patch 6, create a sample drop and count program. With single core, achieved ~20 Mpps drop rate on a 40G ConnectX3-Pro. This includes packet data access, bpf array lookup, and increment. In patch 7, add a page recycle facility to mlx4 rx, enabled when xdp is active. In patch 8, add the XDP_TX type to bpf.h In patch 9, add helper in tx patch for writing tx_desc In patch 10, add support in mlx4 for packet data write and forwarding In patch 11, turn on packet write support in the bpf verifier In patch 12, add a sample program for packet write and forwarding. With single core, achieved ~10 Mpps rewrite and forwarding. [1] https://github.com/iovisor/bpf-docs/blob/master/Express_Data_Path.pdf v10: 1/12: Add bulk refcnt api. 5/12: Move prog from priv to ring. This attribute is still only set globally, but the path to finer granularity should be clear. No lock is taken, so some rings may operate on older programs for a time (one napi loop). Looked into options such as napi_synchronize, but they were deemed too slow (calls to msleep). Rename prog to xdp_prog. Add xdp_ring_num to help with accounting, used more heavily in later patches. 7/12: Adjust to use per-ring xdp prog. Use priv->xdp_ring_num where before priv->prog was used to determine buffer allocations. 9/12: Add cpu_to_be16 to vlan_tag in mxl4_en_xmit(). Remove unused variable from mlx4_en_xmit and unused params from build_inline_wqe. v9: 4/11: Add missing newline in en_err message. 6/11: Move page_cache cleanup from mlx4_en_destroy_rx_ring to mlx4_en_deactivate_rx_ring. Move mlx4_en_moderation_update back to static. Remove calls to mlx4_en_alloc/free_resources in mlx4_xdp_set. Adopt instead the approach of mlx4_en_change_mtu to use a watchdog. 9/11: Use a per-ring function pointer in tx to separate out the code for regular and recycle paths of tx completion handling. Add a helper function to init the recycle ring and callback, called just after activating tx. Remove extra tx ring resource requirement, and instead steal from the upper rings. This helps to avoid needing mlx4_en_alloc_resources. Add some hopefully meaningful error messages for the various error cases. Reverted some of the hard-to-follow logic that was accounting for the extra tx rings. v8: 1/11: Reduce WARN_ONCE to single line. Also, change act param of that function to u32 to match return type of bpf_prog_run_xdp. 2/11: Clarify locking semantics in ndo comment. 4/11: Add en_err warning in mlx4_xdp_set on num_frags/mtu violation. v7: Addressing two of the major discussion points: return codes and ndo. The rest will be taken as todo items for separate patches. Add an XDP_ABORTED type, which explicitly falls through to DROP. The same result must be taken for the default case as well, as it is now well-defined API behavior. Merge ndo_xdp_* into a single ndo. The style is similar to ndo_setup_tc, but with less unidirectional naming convention. The IFLA parameter names are unchanged. TODOs: Add ethtool per-ring stats for aborted, default cases, maybe even drop and tx as well. Avoid duplicate dma sync operation in XDP_PASS case as mentioned by Saeed. 1/12: Add XDP_ABORTED enum, reword API comment, and update commit message. 2/12: Rewrite ndo_xdp_*() into single ndo_xdp() with type/union style calling convention. 3/12: Switch to ndo_xdp callback. 4/12: Add XDP_ABORTED case as a fall-through to XDP_DROP. Implement ndo_xdp. 12/12: Dropped, this will need some more work. v6: 2/12: drop unnecessary netif_device_present check 4/12, 6/12, 9/12: Reorder default case statement above drop case to remove some copy/paste. v5: 0/12: Rebase and remove previous 1/13 patch 1/12: Fix nits from Daniel. Left the (void *) cast as-is, to be fixed in future. Add bpf_warn_invalid_xdp_action() helper, to be used when out of bounds action is returned by the program. Add a comment to bpf.h denoting the undefined nature of out of bounds returns. 2/12: Switch to using bpf_prog_get_type(). Rename ndo_xdp_get() to ndo_xdp_attached(). 3/12: Add IFLA_XDP as a nested type, and add the associated nla_policy for the new subtypes IFLA_XDP_FD and IFLA_XDP_ATTACHED. 4/12: Fixup the use of READ_ONCE in the ndos. Add a user of bpf_warn_invalid_xdp_action helper. 5/12: Adjust to using the nested netlink options. 6/12: kbuild was complaining about overflow of u16 on tile architecture...bump frag_stride to u32. The page_offset member that is computed from this was already u32. v4: 2/12: Add inline helper for calling xdp bpf prog under rcu 3/12: Add detail to ndo comments 5/12: Remove mlx4_call_xdp and use inline helper instead. 6/12: Fix checkpatch complaints 9/12: Introduce new patch 9/12 with common helper for tx_desc write Refactor to use common tx_desc write helper 11/12: Fix checkpatch complaints v3: Rewrite from v2 trying to incorporate feedback from multiple sources. Specifically, add ability to forward packets out the same port and allow packet modification. For packet forwarding, the driver reserves a dedicated set of tx rings for exclusive use by xdp. Upon completion, the pages on this ring are recycled directly back to a small per-rx-ring page cache without being dma unmapped. Use of the percpu skb is dropped in favor of a lightweight struct xdp_buff. The direct packet access feature is leveraged to remove dependence on the skb. The mlx4 driver implementation allocates a page-per-packet and maps it in PCI_DMA_BIDIRECTIONAL mode when the bpf program is activated. Naming is converted to use "xdp" instead of "phys_dev". v2: 1/5: Drop xdp from types, instead consistently use bpf_phys_dev_ Introduce enum for return values from phys_dev hook 2/5: Move prog->type check to just before invoking ndo Change ndo to take a bpf_prog * instead of fd Add ndo_bpf_get rather than keeping a bool in the netdev struct 3/5: Use ndo_bpf_get to fetch bool 4/5: Enforce that only 1 frag is ever given to bpf prog by disallowing mtu to increase beyond FRAG_SZ0 when bpf prog is running, or conversely to set a bpf prog when priv->num_frags > 1 Rename pseudo_skb to bpf_phys_dev_md Implement ndo_bpf_get Add dma sync just before invoking prog Check for explicit bpf return code rather than nonzero Remove increment of rx_dropped 5/5: Use explicit bpf return code in example Update commit log with higher pps numbers ==================== Signed-off-by:
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Brenden Blanco authored
Add a sample that rewrites and forwards packets out on the same interface. Observed single core forwarding performance of ~10Mpps. Since the mlx4 driver under test recycles every single packet page, the perf output shows almost exclusively just the ring management and bpf program work. Slowdowns are likely occurring due to cache misses. Signed-off-by:
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Brenden Blanco authored
For forwarding to be effective, XDP programs should be allowed to rewrite packet data. This requires that the drivers supporting XDP must all map the packet memory as TODEVICE or BIDIRECTIONAL before invoking the program. Signed-off-by:
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Brenden Blanco authored
A user will now be able to loop packets back out of the same port using a bpf program attached to xdp hook. Updates to the packet contents from the bpf program is also supported. For the packet write feature to work, the rx buffers are now mapped as bidirectional when the page is allocated. This occurs only when the xdp hook is active. When the program returns a TX action, enqueue the packet directly to a dedicated tx ring, so as to avoid completely any locking. This requires the tx ring to be allocated 1:1 for each rx ring, as well as the tx completion running in the same softirq. Upon tx completion, this dedicated tx ring recycles pages without unmapping directly back to the original rx ring. In steady state tx/drop workload, effectively 0 page allocs/frees will occur. In order to separate out the paths between free and recycle, a free_tx_desc func pointer is introduced that is optionally updated whenever recycle_ring is activated. By default the original free function is always initialized. Signed-off-by:
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Brenden Blanco authored
In preparation for writing the tx descriptor from multiple functions, create a helper for both normal and blueflame access. Signed-off-by:
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Brenden Blanco authored
XDP enabled drivers must transmit received packets back out on the same port they were received on when a program returns this action. Signed-off-by:
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Brenden Blanco authored
The mlx4 driver by default allocates order-3 pages for the ring to consume in multiple fragments. When the device has an xdp program, this behavior will prevent tx actions since the page must be re-mapped in TODEVICE mode, which cannot be done if the page is still shared. Start by making the allocator configurable based on whether xdp is running, such that order-0 pages are always used and never shared. Since this will stress the page allocator, add a simple page cache to each rx ring. Pages in the cache are left dma-mapped, and in drop-only stress tests the page allocator is eliminated from the perf report. Note that setting an xdp program will now require the rings to be reconfigured. Before: 26.91% ksoftirqd/0 [mlx4_en] [k] mlx4_en_process_rx_cq 17.88% ksoftirqd/0 [mlx4_en] [k] mlx4_en_alloc_frags 6.00% ksoftirqd/0 [mlx4_en] [k] mlx4_en_free_frag 4.49% ksoftirqd/0 [kernel.vmlinux] [k] get_page_from_freelist 3.21% swapper [kernel.vmlinux] [k] intel_idle 2.73% ksoftirqd/0 [kernel.vmlinux] [k] bpf_map_lookup_elem 2.57% swapper [mlx4_en] [k] mlx4_en_process_rx_cq After: 31.72% swapper [kernel.vmlinux] [k] intel_idle 8.79% swapper [mlx4_en] [k] mlx4_en_process_rx_cq 7.54% swapper [kernel.vmlinux] [k] poll_idle 6.36% swapper [mlx4_core] [k] mlx4_eq_int 4.21% swapper [kernel.vmlinux] [k] tasklet_action 4.03% swapper [kernel.vmlinux] [k] cpuidle_enter_state 3.43% swapper [mlx4_en] [k] mlx4_en_prepare_rx_desc 2.18% swapper [kernel.vmlinux] [k] native_irq_return_iret 1.37% swapper [kernel.vmlinux] [k] menu_select 1.09% swapper [kernel.vmlinux] [k] bpf_map_lookup_elem Signed-off-by:
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Brenden Blanco authored
Add a sample program that only drops packets at the BPF_PROG_TYPE_XDP_RX hook of a link. With the drop-only program, observed single core rate is ~20Mpps. Other tests were run, for instance without the dropcnt increment or without reading from the packet header, the packet rate was mostly unchanged. $ perf record -a samples/bpf/xdp1 $(</sys/class/net/eth0/ifindex) proto 17: 20403027 drops/s ./pktgen_sample03_burst_single_flow.sh -i $DEV -d $IP -m $MAC -t 4 Running... ctrl^C to stop Device: eth4@0 Result: OK: 11791017(c11788327+d2689) usec, 59622913 (60byte,0frags) 5056638pps 2427Mb/sec (2427186240bps) errors: 0 Device: eth4@1 Result: OK: 11791012(c11787906+d3106) usec, 60526944 (60byte,0frags) 5133311pps 2463Mb/sec (2463989280bps) errors: 0 Device: eth4@2 Result: OK: 11791019(c11788249+d2769) usec, 59868091 (60byte,0frags) 5077431pps 2437Mb/sec (2437166880bps) errors: 0 Device: eth4@3 Result: OK: 11795039(c11792403+d2636) usec, 59483181 (60byte,0frags) 5043067pps 2420Mb/sec (2420672160bps) errors: 0 perf report --no-children: 26.05% ksoftirqd/0 [mlx4_en] [k] mlx4_en_process_rx_cq 17.84% ksoftirqd/0 [mlx4_en] [k] mlx4_en_alloc_frags 5.52% ksoftirqd/0 [mlx4_en] [k] mlx4_en_free_frag 4.90% swapper [kernel.vmlinux] [k] poll_idle 4.14% ksoftirqd/0 [kernel.vmlinux] [k] get_page_from_freelist 2.78% ksoftirqd/0 [kernel.vmlinux] [k] __free_pages_ok 2.57% ksoftirqd/0 [kernel.vmlinux] [k] bpf_map_lookup_elem 2.51% swapper [mlx4_en] [k] mlx4_en_process_rx_cq 1.94% ksoftirqd/0 [kernel.vmlinux] [k] percpu_array_map_lookup_elem 1.45% swapper [mlx4_en] [k] mlx4_en_alloc_frags 1.35% ksoftirqd/0 [kernel.vmlinux] [k] free_one_page 1.33% swapper [kernel.vmlinux] [k] intel_idle 1.04% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5c5 0.96% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c58d 0.93% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c6ee 0.92% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c6b9 0.89% ksoftirqd/0 [kernel.vmlinux] [k] __alloc_pages_nodemask 0.83% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c686 0.83% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5d5 0.78% ksoftirqd/0 [mlx4_en] [k] mlx4_alloc_pages.isra.23 0.77% ksoftirqd/0 [mlx4_en] [k] 0x000000000001c5b4 0.77% ksoftirqd/0 [kernel.vmlinux] [k] net_rx_action machine specs: receiver - Intel E5-1630 v3 @ 3.70GHz sender - Intel E5645 @ 2.40GHz Mellanox ConnectX-3 @40G Signed-off-by:
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Brenden Blanco authored
Add support for the BPF_PROG_TYPE_XDP hook in mlx4 driver. In tc/socket bpf programs, helpers linearize skb fragments as needed when the program touches the packet data. However, in the pursuit of speed, XDP programs will not be allowed to use these slower functions, especially if it involves allocating an skb. Therefore, disallow MTU settings that would produce a multi-fragment packet that XDP programs would fail to access. Future enhancements could be done to increase the allowable MTU. The xdp program is present as a per-ring data structure, but as of yet it is not possible to set at that granularity through any ndo. Signed-off-by:
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Brenden Blanco authored
Sets the bpf program represented by fd as an early filter in the rx path of the netdev. The fd must have been created as BPF_PROG_TYPE_XDP. Providing a negative value as fd clears the program. Getting the fd back via rtnl is not possible, therefore reading of this value merely provides a bool whether the program is valid on the link or not. Signed-off-by:
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Brenden Blanco authored
Add one new netdev op for drivers implementing the BPF_PROG_TYPE_XDP filter. The single op is used for both setup/query of the xdp program, modelled after ndo_setup_tc. Signed-off-by:
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Brenden Blanco authored
Add a new bpf prog type that is intended to run in early stages of the packet rx path. Only minimal packet metadata will be available, hence a new context type, struct xdp_md, is exposed to userspace. So far only expose the packet start and end pointers, and only in read mode. An XDP program must return one of the well known enum values, all other return codes are reserved for future use. Unfortunately, this restriction is hard to enforce at verification time, so take the approach of warning at runtime when such programs are encountered. Out of bounds return codes should alias to XDP_ABORTED. Signed-off-by:
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Brenden Blanco authored
A subsystem may need to store many copies of a bpf program, each deserving its own reference. Rather than requiring the caller to loop one by one (with possible mid-loop failure), add a bulk bpf_prog_add api. Signed-off-by:
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David S. Miller authored
Gavin Shan says: ==================== NCSI Support This series rebases on David's linux-net git repo ("master" branch). It's to support NCSI stack on drivers/net/ethernet/faraday/ftgmac100.c. The implementation is based on NCSI spec (version: 1.1.0): https://www.dmtf.org/sites/default/files/standards/documents/DSP0222_1.1.0.pdf As the following figure shows and defined in NCSI spec: * The NC-SI (aka NCSI) is defined as the interface between a (Base) Management Controller (BMC) and one or multiple Network Interface Controlers (NIC) on host side. The interface is responsible for providing external network connectivity for BMC. * Each BMC can connect to multiple packages, up to 8. Each package can have multiple channels, up to 32. Every package and channel are identified by 3-bits and 5-bits in NCSI packet. * NCSI packet, encapsulated in ethernet frame, has 0x88F8 in the protocol field. The destination MAC address should be 0xFF's while the source MAC address can be arbitrary one. * NCSI packets are classified to command, response, AEN (Asynchronous Event Notification). Commands are sent from BMC to host (NIC) for configuration and information retrival. Responses, corresponding to commands, are sent from host to BMC for confirmation and requested information. One command should have one and only one response. AEN is sent from host to BMC for notification (e.g. link down on active channel) so that BMC can take appropriate action. +------------------+ +----------------------------------------------+ | | | Host | | BMC | | | | | | +-------------------+ +-------------------+ | | +---------+ | | | Package-A | | Package-B | | | | | | | +---------+---------+ +-------------------+ | | |ftgmac100| | | | Channel | Channel | | Channel | Channel | | +----+----+----+---+ +-+---------+---------+--+---------+---------+-+ | | | | | | +-----------------------------+----------------------+ The series of patches is highlighted as: The design for the patchset is highlighted as below: * The network driver uses 3 interfaces exported from NCSI stack: ncsi_register_dev() - Register (create) a associated NCSI device. ncsi_start_dev() - Bring up the NCSI device. ncsi_unregister_dev() - Destroy the registered NCSI device. * There are several data structures introduced for different objects: struct ncsi_dev - NCSI device seen by network device driver. struct ncsi_dev_priv - NCSI device seen by NCSI stack. struct ncsi_package - NCSI package which can have multiple channels. struct ncsi_channel - NCSI channel. * The NCSI stack is driven by workqueue and state machine internally. * The all available NCSI packages and channels are enumerated (probed) on the first call to ncsi_start_dev(). The NCSI topology won't change until the NCSI device is destroyed. * All available channels will be brought up When the hardware arbitration is enabled. Otherwise, only one channel is selected as active one. The NCSI internal is driven by state machine with help of a workqueue. In the meanwhile, there are 3 states for each channel which can be put into a queue requesting for configuration or suspending. Channels in the queue with inactive state set will be configured (bringup) while channels in the queue with active state will be suspended (teardown). The request configuration or suspending is being applied on the channel if it's in invisible state. * Failover, another inactive channel is selected as active, can happen when the hardware arbitration is disabled. The failover can be caused by timeout on link monitor and AEN. * NCSI stack should be configurable through netlink or another mechanism, it's not implemented in this patchset. It's something TBD. * The first NIC driver that is aware of NCSI: drivers/net/ethernet/faraday/ftgmac100.c Changelog ========= v2 -> v3: * Include (one line) change in include/uapi/linux/if_ether.h to fix build error. v1 -> v2: * Support NCSI spec v1.1.0 (3 more commands and 4 hardware arbitration modes added). * Enable AEN packets according to the supported list. * Introduce NCSI channel states and processing queue in order to support the hardware arbitration. * The hardware arbitration is supported (tested with emulated environment). * Introduce link monitor with GLS (Get Link Status) command/response as part of the error handling defined in NCSI spec. * Support IPv6 address discovery when CONFIG_IPV6 is enabled. ==================== Signed-off-by: -
Gavin Shan authored
Bogus PHY interrupts are observed. This masks the PHY interrupt when the interface works in NCSI mode as there is no attached PHY under the circumstance. Signed-off-by:
Gavin Shan <gwshan@linux.vnet.ibm.com> Acked-by:
Joel Stanley <joel@jms.id.au> Signed-off-by:
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Gavin Shan authored
This matches the driver with devices compatible with "faraday,ftgmac100" declared in the device tree. Originally, device's name from device tree for it. Signed-off-by:
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Gavin Shan authored
This makes ftgmac100 driver support NCSI mode. The NCSI is enabled on the interface if property "use-nc-si" or "use-ncsi" is found from the device node in device tree. * No PHY device is used when NCSI mode is enabled. * The NCSI device (struct ncsi_dev) is created when probing the device while it's enabled/started when the interface is brought up. * Hardware IP checksum dosn't work when NCSI mode is enabled. It is disabled on enabled NCSI. Signed-off-by: -
Gavin Shan authored
The device is assigned with random MAC address. It isn't reasonable. An valid MAC address might have been provided by (uboot) firmware by device-tree or in chip. It's reasonable to use it to maintain consistency. This uses the MAC address from device-tree or that in the chip if it's valid. Otherwise, a random MAC address is given as before. Signed-off-by:
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Gavin Shan authored
This introduces two helper functions to create or destroy MDIO interface. No logical changes introduced except the proper MDIO names are given when having more than one MDIO bus. Signed-off-by:
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