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Configure firmware to use RX hash format in mini CQE in mlx5en(4).

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When using CQE zipping, one can choose between RX hash and Checksum.
This will indicate the parameter on which a zipping session should be
stopped.

While porting the Linux code, Checksum was chosen. However, the value
of Checksum is not being used anywhere.
For the FreeBSD driver, we prefer to use the RX hash format which will
guarantee the RX hash value for all the mini CQEs.
While at it, make sure to initialize the Checksum value in the
decompressed CQE.

Submitted by:	slavash@
MFC after:	3 days
Sponsored by:	Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2019-05-08 10:35:55 +00:00
parent d52ffcb71c
commit a005c157e4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=347264
2 changed files with 12 additions and 5 deletions
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10
sys/dev/mlx5/mlx5_en/mlx5_en_main.c
View File

@ -1955,13 +1955,15 @@ mlx5e_build_rx_cq_param(struct mlx5e_priv *priv,
struct net_dim_cq_moder curr;
void *cqc = param->cqc;
/*
* TODO The sysctl to control on/off is a bool value for now, which means
* we only support CSUM, once HASH is implemnted we'll need to address that.
* We use MLX5_CQE_FORMAT_HASH because the RX hash mini CQE
* format is more beneficial for FreeBSD use case.
*
* Adding support for MLX5_CQE_FORMAT_CSUM will require changes
* in mlx5e_decompress_cqe.
*/
if (priv->params.cqe_zipping_en) {
MLX5_SET(cqc, cqc, mini_cqe_res_format, MLX5_CQE_FORMAT_CSUM);
MLX5_SET(cqc, cqc, mini_cqe_res_format, MLX5_CQE_FORMAT_HASH);
MLX5_SET(cqc, cqc, cqe_compression_en, 1);
}

7
sys/dev/mlx5/mlx5_en/mlx5_en_rx.c
View File

@ -385,7 +385,12 @@ mlx5e_decompress_cqe(struct mlx5e_cq *cq, struct mlx5_cqe64 *title,
*/
title->byte_cnt = mini->byte_cnt;
title->wqe_counter = cpu_to_be16((wqe_counter + i) & cq->wq.sz_m1);
title->check_sum = mini->checksum;
title->rss_hash_result = mini->rx_hash_result;
/*
* Since we use MLX5_CQE_FORMAT_HASH when creating the RX CQ,
* the value of the checksum should be ignored.
*/
title->check_sum = 0;
title->op_own = (title->op_own & 0xf0) |
(((cq->wq.cc + i) >> cq->wq.log_sz) & 1);
}