net/mlx5e: RSS, Block XOR hash with over 128 channels

When supporting more than 128 channels, the RQT size is
calculated by multiplying the number of channels by 2
and rounding up to the nearest power of 2.

The index of the RQT is derived from the RSS hash
calculations. If XOR8 is used as the RSS hash function,
there are only 256 possible hash results, and therefore,
only 256 indexes can be reached in the RQT.

Block setting the RSS hash function to XOR when the number
of channels exceeds 128.

Fixes: 74a8dadac17e ("net/mlx5e: Preparations for supporting larger number of channels")
Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20240409190820.227554-11-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/mlx5e: Support cross-vhca RSS

Implement driver support for the HW feature that allows RX steering of
one device to target other device's RQs.

In SD multi-pf netdev mode, we set the secondaries into silent mode,
disconnecting them from the network. This feature is then used to steer
traffic from the primary to the secondaries.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Revert "mlx5 updates 2023-12-20"

Revert "net/mlx5: Implement management PF Ethernet profile"
This reverts commit 22c4640698a1d47606b5a4264a584e8046641784.
Revert "net/mlx5: Enable SD feature"
This reverts commit c88c49ac9c18fb7c3fa431126de1d8f8f555e912.
Revert "net/mlx5e: Block TLS device offload on combined SD netdev"
This reverts commit 83a59ce0057b7753d7fbece194b89622c663b2a6.
Revert "net/mlx5e: Support per-mdev queue counter"
This reverts commit d72baceb92539a178d2610b0e9ceb75706a75b55.
Revert "net/mlx5e: Support cross-vhca RSS"
This reverts commit c73a3ab8fa6e93a783bd563938d7cf00d62d5d34.
Revert "net/mlx5e: Let channels be SD-aware"
This reverts commit e4f9686bdee7b4dd89e0ed63cd03606e4bda4ced.
Revert "net/mlx5e: Create EN core HW resources for all secondary devices"
This reverts commit c4fb94aa822d6c9d05fc3c5aee35c7e339061dc1.
Revert "net/mlx5e: Create single netdev per SD group"
This reverts commit e2578b4f983cfcd47837bbe3bcdbf5920e50b2ad.
Revert "net/mlx5: SD, Add informative prints in kernel log"
This reverts commit c82d360325112ccc512fc11a3b68cdcdf04a1478.
Revert "net/mlx5: SD, Implement steering for primary and secondaries"
This reverts commit 605fcce33b2d1beb0139b6e5913fa0b2062116b2.
Revert "net/mlx5: SD, Implement devcom communication and primary election"
This reverts commit a45af9a96740873db9a4b5bb493ce2ad81ccb4d5.
Revert "net/mlx5: SD, Implement basic query and instantiation"
This reverts commit 63b9ce944c0e26c44c42cdd5095c2e9851c1a8ff.
Revert "net/mlx5: SD, Introduce SD lib"
This reverts commit 4a04a31f49320d078b8078e1da4b0e2faca5dfa3.
Revert "net/mlx5: Fix query of sd_group field"
This reverts commit e04984a37398b3f4f5a79c993b94c6b1224184cc.
Revert "net/mlx5e: Use the correct lag ports number when creating TISes"
This reverts commit a7e7b40c4bc115dbf2a2bb453d7bbb2e0ea99703.

There are some unanswered questions on the list, and we don't
have any docs. Given the lack of replies so far and the fact
that v6.8 merge window has started - let's revert this and
revisit for v6.9.

Link: https://lore.kernel.org/all/20231221005721.186607-1-saeed@kernel.org/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/mlx5e: Support cross-vhca RSS

Implement driver support for the HW feature that allows RX steering of
one device to target other device's RQs.

In SD multi-mdev netdev mode, we set the secondaries into silent mode,
disconnecting them from the network. This feature is then used to steer
traffic from the primary to the secondaries.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Gal Pressman <gal@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

net/mlx5e: Preparations for supporting larger number of channels

Data center server CPUs number keeps getting larger with time.
Currently, our driver limits the number of channels to 128.

Maximum channels number is enforced and bounded by hardcoded
defines (en.h/MLX5E_MAX_NUM_CHANNELS) even though the device and machine
(CPUs num) can allow more.

Refactor current implementation in order to handle further channels.

The maximum supported channels number will be increased in the followup
patch.

Introduce RQT size calculation/allocation scheme below:
1) Preserve current RQT size of 256 for channels number up to 128 (the
old limit).
2) For greater channels number, RQT size is calculated by multiplying
the channels number by 2 and rounding up the result to the nearest
power of 2. If the calculated RQT size exceeds the maximum supported
size by the NIC, fallback to this maximum RQT size
(1 << log_max_rqt_size).

Since RQT size is no more static, allocate and free the indirection
table SW shadow dynamically.

Signed-off-by: Adham Faris <afaris@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

net/mlx5e: Use a new initializer to build uniform indir table

Replace mlx5e_build_default_indir_rqt with a new initializer of struct
mlx5e_rss_params_indir that works directly with the struct, rather than
its internals.

The new initializer is called mlx5e_rss_params_indir_init_uniform, which
also reflects the purpose (uniform spreading) better.

Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

net/mlx5e: Convert RQT to a dedicated object

Code related to RQT is now encapsulated into a dedicated object and put
into new files en/rqt.{c,h}. All usages are converted.

Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>