net/mlx5e: Derive Striding RQ size from MTU

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In Striding RQ, each WQE serves multiple packets
(hence called Multi-Packet WQE, MPWQE).
The size of a MPWQE is constant (currently 256KB).

Upon a ringparam set operation, we calculate the number of
MPWQEs per RQ. For this, first it is needed to determine the
number of packets that can reside within a single MPWQE.
In this patch we use the actual MTU size instead of ETH_DATA_LEN
for this calculation.

This implies that a change in MTU might require a change
in Striding RQ ring size.

In addition, this obsoletes some WQEs-to-packets translation
functions and helps delete ~60 LOC.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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This commit is contained in:

Tariq Toukan 2018-02-11 15:21:33 +02:00 • committed by Saeed Mahameed

parent 472a1e44b3

commit 73281b78a3

6 changed files with 80 additions and 139 deletions

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63

drivers/net/ethernet/mellanox/mlx5/core/en.h

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79

drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c

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71

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

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2

drivers/net/ethernet/mellanox/mlx5/core/en_rep.c

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2

drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.c

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2

drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib_vlan.c

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