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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/* Copyright (c) 2021, Mellanox Technologies inc. All rights reserved. */
#include "rqt.h"
#include <linux/mlx5/transobj.h>
void mlx5e_rss_params_indir_init_uniform(struct mlx5e_rss_params_indir *indir,
unsigned int num_channels)
{
unsigned int i;
for (i = 0; i < MLX5E_INDIR_RQT_SIZE; i++)
indir->table[i] = i % num_channels;
}
static int mlx5e_rqt_init(struct mlx5e_rqt *rqt, struct mlx5_core_dev *mdev,
u16 max_size, u32 *init_rqns, u16 init_size)
{
void *rqtc;
int inlen;
int err;
u32 *in;
int i;
rqt->mdev = mdev;
rqt->size = max_size;
inlen = MLX5_ST_SZ_BYTES(create_rqt_in) + sizeof(u32) * init_size;
in = kvzalloc(inlen, GFP_KERNEL);
if (!in)
return -ENOMEM;
rqtc = MLX5_ADDR_OF(create_rqt_in, in, rqt_context);
MLX5_SET(rqtc, rqtc, rqt_max_size, rqt->size);
MLX5_SET(rqtc, rqtc, rqt_actual_size, init_size);
for (i = 0; i < init_size; i++)
MLX5_SET(rqtc, rqtc, rq_num[i], init_rqns[i]);
err = mlx5_core_create_rqt(rqt->mdev, in, inlen, &rqt->rqtn);
kvfree(in);
return err;
}
int mlx5e_rqt_init_direct(struct mlx5e_rqt *rqt, struct mlx5_core_dev *mdev,
bool indir_enabled, u32 init_rqn)
{
u16 max_size = indir_enabled ? MLX5E_INDIR_RQT_SIZE : 1;
return mlx5e_rqt_init(rqt, mdev, max_size, &init_rqn, 1);
}
static int mlx5e_bits_invert(unsigned long a, int size)
{
int inv = 0;
int i;
for (i = 0; i < size; i++)
inv |= (test_bit(size - i - 1, &a) ? 1 : 0) << i;
return inv;
}
static int mlx5e_calc_indir_rqns(u32 *rss_rqns, u32 *rqns, unsigned int num_rqns,
u8 hfunc, struct mlx5e_rss_params_indir *indir)
{
unsigned int i;
for (i = 0; i < MLX5E_INDIR_RQT_SIZE; i++) {
unsigned int ix = i;
if (hfunc == ETH_RSS_HASH_XOR)
ix = mlx5e_bits_invert(ix, ilog2(MLX5E_INDIR_RQT_SIZE));
ix = indir->table[ix];
if (WARN_ON(ix >= num_rqns))
/* Could be a bug in the driver or in the kernel part of
* ethtool: indir table refers to non-existent RQs.
*/
return -EINVAL;
rss_rqns[i] = rqns[ix];
}
return 0;
}
int mlx5e_rqt_init_indir(struct mlx5e_rqt *rqt, struct mlx5_core_dev *mdev,
u32 *rqns, unsigned int num_rqns,
u8 hfunc, struct mlx5e_rss_params_indir *indir)
{
u32 *rss_rqns;
int err;
rss_rqns = kvmalloc_array(MLX5E_INDIR_RQT_SIZE, sizeof(*rss_rqns), GFP_KERNEL);
if (!rss_rqns)
return -ENOMEM;
err = mlx5e_calc_indir_rqns(rss_rqns, rqns, num_rqns, hfunc, indir);
if (err)
goto out;
err = mlx5e_rqt_init(rqt, mdev, MLX5E_INDIR_RQT_SIZE, rss_rqns, MLX5E_INDIR_RQT_SIZE);
out:
kvfree(rss_rqns);
return err;
}
void mlx5e_rqt_destroy(struct mlx5e_rqt *rqt)
{
mlx5_core_destroy_rqt(rqt->mdev, rqt->rqtn);
}
static int mlx5e_rqt_redirect(struct mlx5e_rqt *rqt, u32 *rqns, unsigned int size)
{
unsigned int i;
void *rqtc;
int inlen;
u32 *in;
int err;
inlen = MLX5_ST_SZ_BYTES(modify_rqt_in) + sizeof(u32) * size;
in = kvzalloc(inlen, GFP_KERNEL);
if (!in)
return -ENOMEM;
rqtc = MLX5_ADDR_OF(modify_rqt_in, in, ctx);
MLX5_SET(modify_rqt_in, in, bitmask.rqn_list, 1);
MLX5_SET(rqtc, rqtc, rqt_actual_size, size);
for (i = 0; i < size; i++)
MLX5_SET(rqtc, rqtc, rq_num[i], rqns[i]);
err = mlx5_core_modify_rqt(rqt->mdev, rqt->rqtn, in, inlen);
kvfree(in);
return err;
}
int mlx5e_rqt_redirect_direct(struct mlx5e_rqt *rqt, u32 rqn)
{
return mlx5e_rqt_redirect(rqt, &rqn, 1);
}
int mlx5e_rqt_redirect_indir(struct mlx5e_rqt *rqt, u32 *rqns, unsigned int num_rqns,
u8 hfunc, struct mlx5e_rss_params_indir *indir)
{
u32 *rss_rqns;
int err;
if (WARN_ON(rqt->size != MLX5E_INDIR_RQT_SIZE))
return -EINVAL;
rss_rqns = kvmalloc_array(MLX5E_INDIR_RQT_SIZE, sizeof(*rss_rqns), GFP_KERNEL);
if (!rss_rqns)
return -ENOMEM;
err = mlx5e_calc_indir_rqns(rss_rqns, rqns, num_rqns, hfunc, indir);
if (err)
goto out;
err = mlx5e_rqt_redirect(rqt, rss_rqns, MLX5E_INDIR_RQT_SIZE);
out:
kvfree(rss_rqns);
return err;
}
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