- 01 May, 2019 40 commits
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David S. Miller authored
Esben Haabendal says: ==================== net: ll_temac: x86_64 support This patch series adds support for use of ll_temac driver with platform_data configuration and fixes endianess and 64-bit problems so that it can be used on x86_64 platform. A few bugfixes are also included. Changes since v2: - Fixed lp->indirect_mutex initialization regression for OF platforms introduced in v2 Changes since v1: - Make indirect_mutex specification mandatory when using platform_data - Move header to include/linux/platform_data - Enable COMPILE_TEST for XILINX_LL_TEMAC - Rebased to v5.1-rc7 ==================== Signed-off-by:David S. Miller <davem@davemloft.net>
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Esben Haabendal authored
As soon as TAILDESCR_PTR is written, DMA transfers might start. Let's ensure we are ready to receive DMA IRQ's before doing that. Signed-off-by:
Esben Haabendal <esben@geanix.com> Signed-off-by:
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Esben Haabendal authored
This allows custom setup of IRQ coalescing for platforms using legacy platform_device. The irq timeout and count parameters can be used for tuning cpu load vs. latency. I have maintained the 0x00000400 bit in TX_CHNL_CTRL. It is specified as unused in the documentation I have available. It does not make any difference in the hardware I have available, so it is left in to not risk breaking other platforms where it might be used. Signed-off-by:
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Esben Haabendal authored
Use usleep_range() to avoid problems with msleep() actually sleeping much longer than expected. Signed-off-by:
Andrew Lunn <andrew@lunn.ch> Signed-off-by:
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Esben Haabendal authored
As we are actually using a BD for both the skb and each frag contained in it, the oldest TX BD would be overwritten when there was exactly one BD less than needed. Signed-off-by:
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Esben Haabendal authored
Unmap the actual buffer length, not the amount of data received, avoiding resource exhaustion of swiotlb (seen on x86_64 platform). Signed-off-by:
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Esben Haabendal authored
Indirect register access goes through a DCR bus bridge, which allows only one outstanding transaction. And to make matters worse, each TEMAC IP block contains two Ethernet interfaces, and although they seem to have separate registers for indirect access, they actually share the registers. Or to be more specific, MSW, LSW and CTL registers are physically shared between Ethernet interfaces in same TEMAC IP, with RDY register being (almost) specificic to the Ethernet interface. The 0x10000 bit in RDY reflects combined bus ready state though. So we need to take care to synchronize not only within a single device, but also between devices in same TEMAC IP. This commit allows to do that with legacy platform devices. For OF devices, the xlnx,compound parent of the temac node should be used to find siblings, and setup a shared indirect_mutex between them. I will leave this work to somebody else, as I don't have hardware to test that. No regression is introduced by that, as before this commit using two Ethernet interfaces in same TEMAC block is simply broken. Signed-off-by:
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Esben Haabendal authored
With little-endian and 64-bit support in place, the ll_temac driver can now be used on x86 and x86_64 platforms. And while at it, enable COMPILE_TEST also. Signed-off-by:
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Esben Haabendal authored
Both TEMAC and SDMA is big-endian, so make sure that all values in SDMA buffer descriptors (cmdac_bd) are handled as big-endian, independent of the host endianness. With all currently supported platforms being big-endian, this change does not make a change for any of them. Note, when using app3 and app4 for piggybacking skb pointers there is no need to care about endianness, as neither TEMAC nor SDMA access app3 and app4 in TX buffer descriptors. Signed-off-by:
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Esben Haabendal authored
Replace the powerpc specific MMIO register access functions with the generic big-endian mmio access functions, and add support for little-endian access depending on configuration. Big-endian access is maintained as the default, but little-endian can be configured in device-tree binding or in platform data. The temac_ior()/temac_iow() functions are replaced with macro wrappers to avoid modifying existing code more than necessary. Signed-off-by:
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Esben Haabendal authored
The use of buffer descriptor APP4 field (32-bit) for storing skb pointer obviously does not work on 64-bit platforms. As APP3 is also unused, we can use that to store the other half of 64-bit pointer values. Contrary to what is hinted at in commit message of commit 15bfe05c ("net: ethernet: xilinx: Mark XILINX_LL_TEMAC broken on 64-bit") there are no other pointers stored in cdmac_bd. Signed-off-by:
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Esben Haabendal authored
Support initialization with platdata, so the driver can be used on non-device-tree platforms. For currently supported device-tree platforms, the driver should behave as before. Signed-off-by:
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Esben Haabendal authored
As a side effect, a few error cases are fixed. If of_iomap() of sdma_regs failed, no error code was returned. Fixed to return -ENOMEM similar to of_iomap() fail of regs. If sysfs_create_group() or register_netdev() failed, lp->phy_node was not released. Finally, the order in remove function is corrected to be reverse order of what is done in probe, i.e. calling temac_mdio_teardown() last, so we unregister the netdev that most likely is using the mdio_bus first. Signed-off-by:
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YueHaibing authored
Fix inconsistent IS_ERR and PTR_ERR in cpsw_probe, The proper pointer to use is clk instead of mode. This issue was detected with the help of Coccinelle. Fixes: 83a8471b ("net: ethernet: ti: cpsw: refactor probe to group common hw initialization") Signed-off-by:
YueHaibing <yuehaibing@huawei.com> Reviewed-by:
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David S. Miller authored
Vinicius Costa Gomes says: ==================== net/sched: taprio change schedules Changes from RFC: - Removed the patches for taprio offloading, because of the lack of in-tree users; - Updated the links to point to the PATCH version of this series; Original cover letter: Overview -------- This RFC has two objectives, it adds support for changing the running schedules during "runtime", explained in more detail later, and proposes an interface between taprio and the drivers for hardware offloading. These two different features are presented together so it's clear what the "final state" would look like. But after the RFC stage, they can be proposed (and reviewed) separately. Changing the schedules without disrupting traffic is important for handling dynamic use cases, for example, when streams are added/removed and when the network configuration changes. Hardware offloading support allows schedules to be more precise and have lower resource usage. Changing schedules ------------------ The same as the other interfaces we proposed, we try to use the same concepts as the IEEE 802.1Q-2018 specification. So, for changing schedules, there are an "oper" (operational) and an "admin" schedule. The "admin" schedule is mutable and not in use, the "oper" schedule is immutable and is in use. That is, when the user first adds an schedule it is in the "admin" state, and it becomes "oper" when its base-time (basically when it starts) is reached. What this means is that now it's possible to create taprio with a schedule: $ tc qdisc add dev IFACE parent root handle 100 taprio \ num_tc 3 \ map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \ queues 1@0 1@1 2@2 \ base-time 10000000 \ sched-entry S 03 300000 \ sched-entry S 02 300000 \ sched-entry S 06 400000 \ clockid CLOCK_TAI And then, later, after the previous schedule is "promoted" to "oper", add a new ("admin") schedule to be used some time later: $ tc qdisc change dev IFACE parent root handle 100 taprio \ base-time 1553121866000000000 \ sched-entry S 02 500000 \ sched-entry S 0f 400000 \ clockid CLOCK_TAI When enabling the ability to change schedules, it makes sense to add two more defined knobs to schedules: "cycle-time" allows to truncate a cycle to some value, so it repeats after a well-defined value; "cycle-time-extension" controls how much an entry can be extended if it's the last one before the change of schedules, the reason is to avoid a very small cycle when transitioning from a schedule to another. With these, taprio in the software mode should provide a fairly complete implementation of what's defined in the Enhancements for Scheduled Traffic parts of the specification. Hardware offload ---------------- Some workloads require better guarantees from their schedules than what's provided by the software implementation. This series proposes an interface for configuring schedules into compatible network controllers. This part is proposed together with the support for changing schedules, because it raises questions like, should the "qdisc" side be responsible of providing visibility into the schedules or should it be the driver? In this proposal, the driver is called passing the new schedule as soon as it is validated, and the "core" qdisc takes care of displaying (".dump()") the correct schedules at all times. It means that some logic would need to be duplicated in the driver, if the hardware doesn't have support for multiple schedules. But as taprio doesn't have enough information about the underlying controller to know how much in advance a schedule needs to be informed to the hardware, it feels like a fair compromise. The hardware offloading part of this proposal also tries to define an interface for frame-preemption and how it interacts with the scheduling of traffic, see Section 8.6.8.4 of IEEE 802.1Q-2018 for more information. One important difference between the qdisc interface and the qdisc-driver interface, is that the "gate mask" on the qdisc side references traffic classes, that is bit 0 of the gate mask means Traffic Class 0, and in the driver interface, it specifies the queues, that is bit 0 means queue 0. That is to say that taprio converts the references to traffic classes to references to queues before sending the offloading request to the driver. Request for help ---------------- I would like that interested driver maintainers could take a look at the proposed interface and see if it's going to be too awkward for any particular device. Also, pointers to available documentation would be appreciated. The idea here is to start a discussion so we can have an interface that would work for multiple vendors. Links ----- kernel patches: https://github.com/vcgomes/net-next/tree/taprio-add-support-for-change-v3 iproute2 patches: https://github.com/vcgomes/iproute2/tree/taprio-add-support-for-change-v3 ==================== Signed-off-by: -
Vinicius Costa Gomes authored
IEEE 802.1Q-2018 defines the concept of a cycle-time-extension, so the last entry of a schedule before the start of a new schedule can be extended, so "too-short" entries can be avoided. Signed-off-by:
Vinicius Costa Gomes <vinicius.gomes@intel.com> Signed-off-by:
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Vinicius Costa Gomes authored
IEEE 802.1Q-2018 defines that a the cycle-time of a schedule may be overridden, so the schedule is truncated to a determined "width". Signed-off-by:
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Vinicius Costa Gomes authored
The IEEE 802.1Q-2018 defines two "types" of schedules, the "Oper" (from operational?) and "Admin" ones. Up until now, 'taprio' only had support for the "Oper" one, added when the qdisc is created. This adds support for the "Admin" one, which allows the .change() operation to be supported. Just for clarification, some quick (and dirty) definitions, the "Oper" schedule is the currently (as in this instant) running one, and it's read-only. The "Admin" one is the one that the system configurator has installed, it can be changed, and it will be "promoted" to "Oper" when it's 'base-time' is reached. The idea behing this patch is that calling something like the below, (after taprio is already configured with an initial schedule): $ tc qdisc change taprio dev IFACE parent root \ base-time X \ sched-entry <CMD> <GATES> <INTERVAL> \ ... Will cause a new admin schedule to be created and programmed to be "promoted" to "Oper" at instant X. If an "Admin" schedule already exists, it will be overwritten with the new parameters. Up until now, there was some code that was added to ease the support of changing a single entry of a schedule, but was ultimately unused. Now, that we have support for "change" with more well thought semantics, updating a single entry seems to be less useful. So we remove what is in practice dead code, and return a "not supported" error if the user tries to use it. If changing a single entry would make the user's life easier we may ressurrect this idea, but at this point, removing it simplifies the code. For now, only the schedule specific bits are allowed to be added for a new schedule, that means that 'clockid', 'num_tc', 'map' and 'queues' cannot be modified. Example: $ tc qdisc change dev IFACE parent root handle 100 taprio \ base-time $BASE_TIME \ sched-entry S 00 500000 \ sched-entry S 0f 500000 \ clockid CLOCK_TAI The only change in the netlink API introduced by this change is the introduction of an "admin" type in the response to a dump request, that type allows userspace to separate the "oper" schedule from the "admin" schedule. If userspace doesn't support the "admin" type, it will only display the "oper" schedule. Signed-off-by: -
Vinicius Costa Gomes authored
Right now, this isn't a problem, but the next commit allows schedules to be added during runtime. When a new schedule transitions from the inactive to the active state ("admin" -> "oper") the previous one can be freed, if it's freed just after the RCU read lock is released, we may access an invalid entry. So, we should take care to protect the dequeue() flow, so all the places that access the entries are protected by the RCU read lock. Signed-off-by: -
David S. Miller authored
Yuchung Cheng says: ==================== undo congestion window on spurious SYN or SYNACK timeout Linux TCP currently uses the initial congestion window of 1 packet if multiple SYN or SYNACK timeouts per RFC6298. However such timeouts are often spurious on wireless or cellular networks that experience high delay variances (e.g. ramping up dormant radios or local link retransmission). Another case is when the underlying path is longer than the default SYN timeout (e.g. 1 second). In these cases starting the transfer with a minimal congestion window is detrimental to the performance for short flows. One naive approach is to simply ignore SYN or SYNACK timeouts and always use a larger or default initial window. This approach however risks pouring gas to the fire when the network is already highly congested. This is particularly true in data center where application could start thousands to millions of connections over a single or multiple hosts resulting in high SYN drops (e.g. incast). This patch-set detects spurious SYN and SYNACK timeouts upon completing the handshake via the widely-supported TCP timestamp options. Upon such events the sender reverts to the default initial window to start the data transfer so it gets best of both worlds. This patch-set supports this feature for both active and passive as well as Fast Open or regular connections. ==================== Signed-off-by: -
Yuchung Cheng authored
Relocate the congestion window initialization from tcp_init_metrics() to tcp_init_transfer() to improve code readability. Signed-off-by:
Yuchung Cheng <ycheng@google.com> Signed-off-by:
Neal Cardwell <ncardwell@google.com> Signed-off-by:
Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
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Yuchung Cheng authored
Use a helper to consolidate two identical code block for passive TFO. Signed-off-by:
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Yuchung Cheng authored
This patch makes passive Fast Open reverts the cwnd to default initial cwnd (10 packets) if the SYNACK timeout is spurious. Passive Fast Open uses a full socket during handshake so it can use the existing undo logic to detect spurious retransmission by recording the first SYNACK timeout in key state variable retrans_stamp. Upon receiving the ACK of the SYNACK, if the socket has sent some data before the timeout, the spurious timeout is detected by tcp_try_undo_recovery() in tcp_process_loss() in tcp_ack(). But if the socket has not send any data yet, tcp_ack() does not execute the undo code since no data is acknowledged. The fix is to check such case explicitly after tcp_ack() during the ACK processing in SYN_RECV state. In addition this is checked in FIN_WAIT_1 state in case the server closes the socket before handshake completes. Signed-off-by:
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Yuchung Cheng authored
TCP sender would use congestion window of 1 packet on the second SYN and SYNACK timeout except passive TCP Fast Open. This makes passive TFO too aggressive and unfair during congestion at handshake. This patch fixes this issue so TCP (fast open or not, passive or active) always conforms to the RFC6298. Note that tcp_enter_loss() is called only once during recurring timeouts. This is because during handshake, high_seq and snd_una are the same so tcp_enter_loss() would incorrect set the undo state variables multiple times. Signed-off-by:
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Yuchung Cheng authored
Linux implements RFC6298 and use an initial congestion window of 1 upon establishing the connection if the SYNACK packet is retransmitted 2 or more times. In cellular networks SYNACK timeouts are often spurious if the wireless radio was dormant or idle. Also some network path is longer than the default SYNACK timeout. In both cases falsely starting with a minimal cwnd are detrimental to performance. This patch avoids doing so when the final ACK's TCP timestamp indicates the original SYNACK was delivered. It remembers the original SYNACK timestamp when SYNACK timeout has occurred and re-uses the function to detect spurious SYN timeout conveniently. Note that a server may receives multiple SYNs from and immediately retransmits SYNACKs without any SYNACK timeout. This often happens on when the client SYNs have timed out due to wireless delay above. In this case since the server will still use the default initial congestion (e.g. 10) because tp->undo_marker is reset in tcp_init_metrics(). This is an intentional design because packets are not lost but delayed. This patch only covers regular TCP passive open. Fast Open is supported in the next patch. Signed-off-by:
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Yuchung Cheng authored
Detecting spurious SYNACK timeout using timestamp option requires recording the exact SYNACK skb timestamp. Previously the SYNACK sent timestamp was stamped slightly earlier before the skb was transmitted. This patch uses the SYNACK skb transmission timestamp directly. Signed-off-by:
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Yuchung Cheng authored
Linux implements RFC6298 and use an initial congestion window of 1 upon establishing the connection if the SYN packet is retransmitted 2 or more times. In cellular networks SYN timeouts are often spurious if the wireless radio was dormant or idle. Also some network path is longer than the default SYN timeout. Having a minimal cwnd on both cases are detrimental to TCP startup performance. This patch extends TCP undo feature (RFC3522 aka TCP Eifel) to detect spurious SYN timeout via TCP timestamps. Since tp->retrans_stamp records the initial SYN timestamp instead of first retransmission, we have to implement a different undo code additionally. The detection also must happen before tcp_ack() as retrans_stamp is reset when SYN is acknowledged. Note this patch covers both active regular and fast open. Signed-off-by:
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Yuchung Cheng authored
Previously if an active TCP open has SYN timeout, it always undo the cwnd upon receiving the SYNACK. This is because tcp_clean_rtx_queue would reset tp->retrans_stamp when SYN is acked, which fools then tcp_try_undo_loss and tcp_packet_delayed. Addressing this issue is required to properly support undo for spurious SYN timeout. Fixing this is tricky -- for active TCP open tp->retrans_stamp records the time when the handshake starts, not the first retransmission time as the name may suggest. The simplest fix is for tcp_packet_delayed to ensure it is valid before comparing with other timestamp. One side effect of this change is active TCP Fast Open that incurred SYN timeout. Upon receiving a SYN-ACK that only acknowledged the SYN, it would immediately retransmit unacknowledged data in tcp_ack() because the data is marked lost after SYN timeout. But the retransmission would have an incorrect ack sequence number since rcv_nxt has not been updated yet tcp_rcv_synsent_state_process(), the retransmission needs to properly handed by tcp_rcv_fastopen_synack() like before. Signed-off-by:
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Gustavo A. R. Silva authored
Replace "pass through" with a proper "fall through" annotation in order to fix the following warning: drivers/net/netdevsim/bus.c: In function ‘new_device_store’: drivers/net/netdevsim/bus.c:170:14: warning: this statement may fall through [-Wimplicit-fallthrough=] port_count = 1; ~~~~~~~~~~~^~~ drivers/net/netdevsim/bus.c:172:2: note: here case 2: ^~~~ Warning level 3 was used: -Wimplicit-fallthrough=3 This fix is part of the ongoing efforts to enable -Wimplicit-fallthrough Signed-off-by:
Gustavo A. R. Silva <gustavo@embeddedor.com> Acked-by:
Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by:
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Gustavo A. R. Silva authored
In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. This patch fixes the following warning: drivers/net/ethernet/sfc/mcdi_port.c: In function ‘efx_mcdi_phy_decode_link’: ./include/linux/compiler.h:77:22: warning: this statement may fall through [-Wimplicit-fallthrough=] # define unlikely(x) __builtin_expect(!!(x), 0) ^~~~~~~~~~~~~~~~~~~~~~~~~~ ./include/asm-generic/bug.h:125:2: note: in expansion of macro ‘unlikely’ unlikely(__ret_warn_on); \ ^~~~~~~~ drivers/net/ethernet/sfc/mcdi_port.c:344:3: note: in expansion of macro ‘WARN_ON’ WARN_ON(1); ^~~~~~~ drivers/net/ethernet/sfc/mcdi_port.c:345:2: note: here case MC_CMD_FCNTL_OFF: ^~~~ Warning level 3 was used: -Wimplicit-fallthrough=3 This patch is part of the ongoing efforts to enable -Wimplicit-fallthrough. Signed-off-by:Edward Cree <ecree@solarflare.com> Signed-off-by:
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Moshe Shemesh authored
The devlink health reporters create/destroy and user commands currently use the devlink->lock as a locking mechanism. Different reporters have different rules in the driver and are being created/destroyed during different stages of driver load/unload/running. So during execution of a reporter recover the flow can go through another reporter's destroy and create. Such flow leads to deadlock trying to lock a mutex already held. With the new locking mechanism the different reporters share mutex lock only to protect access to shared reporters list. Added refcount per reporter, to protect the reporters from destroy while being used. Signed-off-by:
Moshe Shemesh <moshe@mellanox.com> Signed-off-by:
Jiri Pirko <jiri@mellanox.com> Acked-by:
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David S. Miller authored
Igor Russkikh says: ==================== net: atlantic: Aquantia driver updates 2019-04 This patchset contains various improvements: - Work targeting link up speedups: link interrupt introduced, some other logic changes to imrove this. - FW operations securing with mutex - Counters and statistics logic improved by Dmitry - read out of chip temperature via hwmon interface implemented by Yana and Nikita. v4 changes: - remove drvinfo_exit noop - 64bit stats should be readed out sequentially (lsw, then msw) declare 64bit read ops for that v3 changes: - temp ops renamed to phy_temp ops - mutex commits squashed for better structure v2 changes: - use threaded irq for link state handling - rework hwmon via devm_hwmon_device_register_with_info Extra comments on review from Andrew: - direct device name pointer is used in hwmon registration. This causes hwmon device to derive possible interface name changes - Will consider sanity checks for firmware mutex lock separately. Right now there is no single point exsists where such check could be easily added. - There is no way now to fetch and configure min/max/crit temperatures via FW. Will investigate this separately. ==================== Signed-off-by: -
Nikita Danilov authored
Some device ids were never released and does not exist. Cleanup these. Signed-off-by:
Nikita Danilov <ndanilov@aquantia.com> Signed-off-by:
Igor Russkikh <igor.russkikh@aquantia.com> Signed-off-by:
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Dmitry Bogdanov authored
DMA counters are 64 bit and we can fetch that to reduce counter overflow, espesially on byte counters. Tested-by:
Dmitry Bogdanov <dmitry.bogdanov@aquantia.com> Signed-off-by:
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Dmitry Bogdanov authored
aq_nic_update_ndev_stats pushes statistics to ndev->stats from system interface. This is not always good because it counts packets/bytes before any of rx filters (including mac filter). Its better to report the packet/bytes statistics from DMA counters which gives actual values of data transferred over pci. System level stats is still available via ethtool. Signed-off-by:
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Dmitry Bogdanov authored
This improves ethtool -S usage, where stats are now actual on each request. Before that stats only were updated at service timer period. Tested-by:
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Igor Russkikh authored
Service timer callback fetches statistics from FW and that may cause a long delay in error cases. We also now need to use fw mutex to prevent concurrent access to FW, thus - extract that logic from timer callback into the job in the separate work queue. Signed-off-by:
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Nikita Danilov authored
Some of FW operations could be invoked simultaneously, from f.e. ethtool context and from service service activity work. Here we introduce a fw mutex to secure and serialize access to FW logic. Signed-off-by:
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Igor Russkikh authored
Typo in msi code. No much impact though. Signed-off-by:
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Igor Russkikh authored
Improve for better readability Signed-off-by:
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