net/mlx5e: SHAMPO, Fix header formulas for higher MTUs and 64K pages

net/mlx5e: SHAMPO, Fix header formulas for higher MTUs and 64K pages

[ Upstream commit d8a7ed9586c7579a99e9e2d90988c9eceeee61ff ]

The MLX5E_SHAMPO_WQ_HEADER_PER_PAGE and
MLX5E_SHAMPO_LOG_MAX_HEADER_ENTRY_SIZE macros are used directly in
several places under the assumption that there will always be more
headers per WQE than headers per page. However, this assumption doesn't
hold for 64K page sizes and higher MTUs (> 4K). This can be first
observed during header page allocation: ksm_entries will become 0 during
alignment to MLX5E_SHAMPO_WQ_HEADER_PER_PAGE.

This patch introduces 2 additional members to the mlx5e_shampo_hd struct
which are meant to be used instead of the macrose mentioned above.
When the number of headers per WQE goes below
MLX5E_SHAMPO_WQ_HEADER_PER_PAGE, clamp the number of headers per
page and expand the header size accordingly so that the headers
for one WQE cover a full page.

All the formulas are adapted to use these two new members.

Fixes: 945ca432bfd0 ("net/mlx5e: SHAMPO, Drop info array")
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/1762238915-1027590-4-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>