As preparation for the upcoming TX MPWQE support for SKBs, rename struct
mlx5e_xdp_mpwqe to mlx5e_tx_mpwqe and move it above struct mlx5e_txqsq.
This structure will be reused in the regular SQ and in the regular TX
data path. Also rename mlx5e_xdp_xmit_data to mlx5e_xmit_data - it will
be used in the upcoming TX MPWQE flow.
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
As preparation for the upcoming TX MPWQE for SKBs, create a function
(mlx5e_tx_mpwqe_is_full) to check whether an MPWQE session is full. This
function will be shared by MPWQE code for XDP and for SKBs. Defines are
renamed and moved to make them not XDP-specific.
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
TX MPWQE support for SKBs is coming in one of the following patches, and
a single MPWQE can send multiple SKBs. This commit prepares the TX path
code to handle such cases:
1. An additional FIFO for SKBs is added, just like the FIFO for DMA
chunks.
2. struct mlx5e_tx_wqe_info will contain num_fifo_pkts. If a given WQE
contains only one packet, num_fifo_pkts will be zero, and the SKB will
be stored in mlx5e_tx_wqe_info, as usual. If num_fifo_pkts > 0, the SKB
pointer will be NULL, and the SKBs will be stored in the FIFO.
This change has no performance impact in TCP single stream test and
XDP_TX single stream test.
When compiled with a recent GCC, this change shows no visible
performance impact on UDP pktgen (burst 32) single stream test either:
Packet rate: 16.95 Mpps (±0.15 Mpps) -> 16.96 Mpps (±0.12 Mpps)
Instructions per packet: 429 -> 421
Cycles per packet: 160 -> 156
Instructions per cycle: 2.69 -> 2.70
CPU: Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz (x86_64)
NIC: Mellanox ConnectX-6 Dx
GCC 10.2.0
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Before this patch, mlx5e_ktls_tx_handle_resync_dump_comp checked for
resync_dump_frag_page. It happened for all WQEs without an SKB,
including padding WQEs, and required a function call. Normally, padding
WQEs happen more often than TLS resyncs. Take this check out of the
function and put it to an inline function to save a call on all padding
WQEs.
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
A constant for the number of DS in an empty WQE (i.e. a WQE without data
segments) is needed in multiple places (normal TX data path, MPWQE in
XDP), but currently we have a constant for XDP and an inline formula in
normal TX. This patch introduces a common constant.
Additionally, mlx5e_xdp_mpwqe_session_start is converted to use struct
assignment, because the code nearby is touched.
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Use MLX5E_XDP_MPW_MAX_WQEBBS to reserve space for a MPWQE, because it's
actually the maximal size a MPWQE can take.
Reorganize the logic that checks when to close the MPWQE session:
1. Put all checks into a single function.
2. When inline is on, make only one comparison - if it's false, the less
strict one will also be false. The compiler probably optimized it out
anyway, but it's clearer to also reflect it in the code.
The MLX5E_XDP_INLINE_WQE_* defines are also changed to make the
calculations more correct from the logical point of view. Though
MLX5E_XDP_INLINE_WQE_MAX_DS_CNT used to be 16 and didn't change its
value, the calculation used to be DIV_ROUND_UP(max inline packet size,
MLX5_SEND_WQE_DS), and the numerator should have included sizeof(struct
mlx5_wqe_inline_seg).
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
A huge function mlx5e_sq_xmit was split into several to achieve multiple
goals:
1. Reuse the code in IPoIB.
2. Better intergrate with TLS, IPSEC, GENEVE and checksum offloads. Now
it's possible to reserve space in the WQ before running eseg-based
offloads, so:
2.1. It's not needed to copy cseg and eseg after mlx5e_fill_sq_frag_edge
anymore.
2.2. mlx5e_txqsq_get_next_pi will be used instead of the legacy
mlx5e_fill_sq_frag_edge for better code maintainability and reuse.
3. Prepare for the upcoming TX MPWQE for SKBs. It will intervene after
mlx5e_sq_calc_wqe_attr to check if it's possible to use MPWQE, and the
code flow will split into two paths: MPWQE and non-MPWQE.
Two high-level functions are provided to send packets:
* mlx5e_xmit is called by the networking stack, runs offloads and sends
the packet. In one of the following patches, MPWQE support will be added
to this flow.
* mlx5e_sq_xmit_simple is called by the TLS offload, runs only the
checksum offload and sends the packet.
This change has no performance impact in TCP single stream test and
XDP_TX single stream test.
When compiled with a recent GCC, this change shows no visible
performance impact on UDP pktgen (burst 32) single stream test either:
Packet rate: 16.86 Mpps (±0.15 Mpps) -> 16.95 Mpps (±0.15 Mpps)
Instructions per packet: 434 -> 429
Cycles per packet: 158 -> 160
Instructions per cycle: 2.75 -> 2.69
CPU: Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz (x86_64)
NIC: Mellanox ConnectX-6 Dx
GCC 10.2.0
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Move mlx5e_tx_wqe_inline_mode from en/txrx.h to en_tx.c as it's only
used there.
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Struct assignment guarantees that all fields of the structure are
initialized (those that are not mentioned are zeroed). It makes code
mode robust and reduces chances for unpredictable behavior when one
forgets to reset some field and it holds an old value from previous
iterations of using the structure.
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
As preparation for the next patch, don't increase ihs to calculate
ds_cnt and then decrease it, but rather calculate the intermediate value
temporarily. This code has the same amount of arithmetic operations, but
now allows to split out ds_cnt calculation, which will be performed in
the next patch.
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
-----BEGIN PGP SIGNATURE-----
iQFHBAABCgAxFiEEK3kIWJt9yTYMP3ehqclaivrt76kFAl9onIcTHG1rbEBwZW5n
dXRyb25peC5kZQAKCRCpyVqK+u3vqf2aCACpwHz9PLKTX4zNDnDRsA7x4c+Gk2nU
FOgwodyk9ayax1lLYkgq3ynlb5zM4tRNKLJguoJX69pVvw87uPwBhEbQWQkFFZoW
ErkAmYgzGeoA2bu/iJnbsktm7uyEv5a5SntZ+3DSfdnJhuZoU2WfgGa0Z6yDYlWG
W6/Dy66XGKzCrK1iFOyvvaNDOhS+Jkul1JWcyhrztQeCbIPTiqVztaE/QA+5cDoT
ScO4LdHx7U49XQMiNUjrHFv8qso7fVPicqnefWb19w22wixPzUSGNjCOk284qLn9
eldxYwN77sC8VzPIiyKv7sW8z1o+lq1uTeO5Aa+ATqhCdwTmeNIVfJsp
=C8ET
-----END PGP SIGNATURE-----
Merge tag 'linux-can-next-for-5.10-20200921' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next
Marc Kleine-Budde says:
====================
pull-request: can-next 2020-09-21
this is a pull request of 38 patches for net-next.
the first 5 patches are by Colin Ian King, Alexandre Belloni and me and they
fix various spelling mistakes.
The next patch is by me and fixes the indention in the CAN raw protocol
according to the kernel coding style.
Diego Elio Pettenò contributes two patches to fix dead links in CAN's Kconfig.
Masahiro Yamada's patch removes the "WITH Linux-syscall-note" from SPDX tag of
C files.
AThe next 4 patches are by me and target the CAN device infrastructure and add
error propagation and improve the output of various messages to ease driver
development and debugging.
YueHaibing's patch for the c_can driver removes an unused inline function.
Next follows another patch by Colin Ian King, which removes the unneeded
initialization of a variable in the mcba_usb driver.
A patch by me annotates a fallthrough in the mscan driver.
The ti_hecc driver is converted to use devm_platform_ioremap_resource_byname()
in a patch by Dejin Zheng.
Liu Shixin's patch converts the pcan_usb_pro driver to make use of
le32_add_cpu() instead of open coding it.
Wang Hai's patch for the peak_pciefd_main driver removes an unused makro.
Vaibhav Gupta's patch converts the pch_can driver to generic power management.
Stephane Grosjean improves the pcan_usb usb driver by first documenting the
commands sent to the device and by adding support of rxerr/txerr counters.
The next patch is by me and cleans up the Kconfig of the CAN SPI drivers.
The next 6 patches all target the mcp251x driver, they are by Timo Schlüßler,
Andy Shevchenko, Tim Harvey and me. They update the DT bindings documentation,
sort the include files alphabetically, add GPIO support, make use of the
readx_poll_timeout() helper, and add support for half duplex SPI-controllers.
Wolfram Sang contributes a patch to update the contact email address in the
mscan driver, while Zhang Changzhong updates the clock handling.
The next patch is by and updates the rx-offload infrastructure to support
callback less usage.
The last 6 patches add support for the mcp25xxfd CAN SPI driver. First the
dt-bindings are added by Oleksij Rempel, the regmap infrastructure and the main
driver is contributed by me. Kurt Van Dijck adds listen-only support,
Manivannan Sadhasivam adds himself as maintainer, and Thomas Kopp himself as a
reviewer.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
* some AP-side infrastructure for FILS discovery and
unsolicited probe resonses
* a major rework of the encapsulation/header conversion
offload from Felix, to fit better with e.g. AP_VLAN
interfaces
* performance fix for VHT A-MPDU size, don't limit to HT
* some initial patches for S1G (sub 1 GHz) support, more
will come in this area
* minor cleanups
-----BEGIN PGP SIGNATURE-----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=Bnsm
-----END PGP SIGNATURE-----
Merge tag 'mac80211-next-for-net-next-2020-09-21' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next
Johannes Berg says:
====================
This time we have:
* some AP-side infrastructure for FILS discovery and
unsolicited probe resonses
* a major rework of the encapsulation/header conversion
offload from Felix, to fit better with e.g. AP_VLAN
interfaces
* performance fix for VHT A-MPDU size, don't limit to HT
* some initial patches for S1G (sub 1 GHz) support, more
will come in this area
* minor cleanups
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Fixes gcc '-Wunused-but-set-variable' warning:
drivers/net/ethernet/natsemi/ns83820.c: In function ns83820_get_link_ksettings:
drivers/net/ethernet/natsemi/ns83820.c:1210:11: warning: variable ‘tanar’ set but not used [-Wunused-but-set-variable]
`tanar` is never used, so remove it.
Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
After commit 37ab4fa784 ("net: unix: allow bind to fail on mutex lock"),
the assignment to err is redundant. So remove it.
Signed-off-by: Jing Xiangfeng <jingxiangfeng@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Enable ALDPS(Advanced Link Down Power Saving) to save power when
link down.
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
There is an off-by-one error in rtl8366rb_is_vlan_valid()
making VLANs 0..4094 valid while it should be 1..4095.
Fix it.
Fixes: d8652956cf ("net: dsa: realtek-smi: Add Realtek SMI driver")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
In mt7531_cpu_port_config(), if the variable port is neither 5 nor 6,
then variable interface will be used uninitialised. Change the function
to return -EINVAL in this case.
As the return value of mt7531_cpu_port_config() is never checked
(even though it returns an int) add a check in the correct place so that
the error can be passed up the call stack. Now that we correctly handle
errors thrown in this function, also check the return value of
mt7531_mac_config() in case an error occurs here. Also add misisng
checks to mt7530_setup() and mt7531_setup(), which are another level
further up the call stack.
Fixes: c288575f78 ("net: dsa: mt7530: Add the support of MT7531 switch")
Addresses-Coverity: 1496993 ("Uninitialized variables")
Signed-off-by: Alex Dewar <alex.dewar90@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Currently the backlog status in not exposed to user-space.
Since long backlogs (or simply not empty ones) can be a
source of noticeable latency, -RT deployments need some way
to inspect it.
Additionally, there isn't a direct match between 'softnet_stat'
lines and the related CPU - sd for offline CPUs are not dumped -
so this patch also includes the CPU id into such entry.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Shay Agroskin says:
====================
Update license and polish ENA driver code
This series adds the following:
- Change driver's license into SPDX format
- Capitalize all log prints in ENA driver
- Fix issues raised by static checkers
- Improve code readability by adding functions, fix spelling
mistakes etc.
- Update driver's documentation
Changed from previous version:
v1->v2: dropped patch that transforms pr_* log prints into dev_* prints
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
The PCI vendor IDs in the documentation inaccurately describe the ENA
devices. For example, the 1d0f:ec20 can have LLQ support. The driver
loads in LLQ mode by default, and a message is printed to the kernel
ring if the mode isn't supported by the device, so the device table
isn't needed.
Also, LLQ can support various entry sizes, so the documentation is
updated to reflect that.
Interrupt moderation description is also updated to be more accurate.
Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
After running Sparse checker on the driver using
make C=1 M=drivers/net/ethernet/amazon/ena
the only error that is thrown is:
sparse: sparse: Using plain integer as NULL pointer
about the line
struct ena_calc_queue_size_ctx calc_queue_ctx = { 0 };
This patch fixes this warning, thus making our driver free (for now) of
Sparse errors/warnings.
To make a more complete work, this patch also fixes all static warnings
that were found using an internal static checker.
Signed-off-by: Ido Segev <idose@amazon.com>
Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The formal name changes to "ENA_ADMIN_RSS_INDIRECTION_TABLE_CONFIG".
Indirection is the ability to reference "something" using "something else"
instead of the value itself.
Indirection table, as the name implies, is the ability to reference
CPU/Queue value using hash-to-CPU table instead of CPU/Queue itself.
This patch renames the variable keys_num, which describes the number of
words in the RSS hash key, to key_parts which makes its purpose clearer
in RSS context.
Signed-off-by: Amit Bernstein <amitbern@amazon.com>
Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
The placement policy is printed in the process of queue creation in
ena_up(). No need to print it in ena_probe().
Signed-off-by: Arthur Kiyanovski <akiyano@amazon.com>
Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Capitalize all log strings printed by the ena driver to make their
format uniform across it.
Also fix indentation, spelling mistakes and comments to improve code
readability. This also includes adding comments to macros/enums whose
purpose might be difficult to understand.
Separate some code into functions to make it easier to understand the
purpose of these lines.
Signed-off-by: Amit Bernstein <amitbern@amazon.com>
Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Make log prints in ena_netdev use the same log functions as the rest of
the driver.
For the sake of consistency, all prints in ena_netdev file were
converted into netif_* format except where netdev struct isn't yet
defined. For these places, dev_* log functions are used (similar to
the patch for ena_com files).
This commit leaves some corner cases which would be changed in a
future patch.
Signed-off-by: Amit Bernstein <amitbern@amazon.com>
Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
All ena files should now use SPDX format in their license string. This
doesn't change the license of the files, but rather states the same
license in fewer words.
Also update the license years in some of the files.
Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Simplify the return expression.
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Simplify the return expression.
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This patch adds support for the Microchip MCP25xxFD SPI CAN controller family.
Tested-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20200918172536.2074504-4-mkl@pengutronix.de
This patch adds the regmap infrastructure for the Microchip MCP25xxFD SPI CAN
controller family. The actual driver is added in the next commit.
Tested-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20200918172536.2074504-3-mkl@pengutronix.de
This patch adds the device-tree binding documentation for the Microchip
MCP25xxFD SPI CAN controller family.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20200918172536.2074504-2-mkl@pengutronix.de
This patch adds a new initialization function:
can_rx_offload_add_manual()
It should be used to add support rx-offload to a driver, if the callback
mechanism should not be used. Use e.g. can_rx_offload_queue_sorted() to queue
skbs into rx-offload.
Link: https://lore.kernel.org/r/20200915223527.1417033-33-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Some SPI host controllers do not support full-duplex SPI and are
marked as such via the SPI_CONTROLLER_HALF_DUPLEX controller flag.
For such controllers use half duplex transactions but retain full
duplex transactions for the controllers that can handle those.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Link: https://lore.kernel.org/r/1595516275-1179-1-git-send-email-tharvey@gateworks.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
The mcp251x variants feature 3 general purpose digital inputs and 2
outputs. With this patch they are accessible through the gpio framework.
Signed-off-by: Timo Schlüßler <schluessler@krause.de>
Tested-by: Timo Schlüßler <schluessler@krause.de>
Link: https://lore.kernel.org/r/20200915223527.1417033-28-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
The next patch adds gpio controller support to the mcp251x driver. This
patch updates the binding accordingly.
Cc: Timo Schlüßler <schluessler@krause.de>
Link: https://lore.kernel.org/r/20200915223527.1417033-26-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Since commits
653ee35ce6 ("can: hi311x: remove custom DMA mapped buffer")
Fixes: df58525df3 ("can: mcp251x: remove custom DMA mapped buffer")
both the hi3111x and the mcp251x driver don't make use of the DMA API
any more. So we can safely remove the HAS_DMA dependency.
While we're here, remove the unneeded CAN_DEV and SPI dependencies from
the CAN_HI311X symbol, as the parent menus already have these
dependencies.
Link: https://lore.kernel.org/r/20200915223527.1417033-24-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This patch adds the support of the rx/tx errors CAN counters to the
driver of the PCAN-USB PC-CAN interface from PEAK-System GmbH.
The PCAN-USB is capable of giving back the values of the rx/tx errors
counters, to provide more details and statistics to the linux-can layer.
Getting these values allows the driver to better tune CAN_ERR_CRTL_TX_xxx
and CAN_ERR_CRTL_RX_xxx bits in case of the interface enters any
CAN_STATE_ERROR_xxx state.
Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
Link: https://lore.kernel.org/r/20191206153803.17725-3-s.grosjean@peak-system.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
