/*
* Copyright (c) 2018, Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "port_buffer.h"
int mlx5e_port_query_buffer(struct mlx5e_priv *priv,
struct mlx5e_port_buffer *port_buffer)
{
u16 port_buff_cell_sz = priv->dcbx.port_buff_cell_sz;
struct mlx5_core_dev *mdev = priv->mdev;
int sz = MLX5_ST_SZ_BYTES(pbmc_reg);
u32 total_used = 0;
void *buffer;
void *out;
int err;
int i;
out = kzalloc(sz, GFP_KERNEL);
if (!out)
return -ENOMEM;
err = mlx5e_port_query_pbmc(mdev, out);
if (err)
goto out;
for (i = 0; i < MLX5E_MAX_BUFFER; i++) {
buffer = MLX5_ADDR_OF(pbmc_reg, out, buffer[i]);
port_buffer->buffer[i].lossy =
MLX5_GET(bufferx_reg, buffer, lossy);
port_buffer->buffer[i].epsb =
MLX5_GET(bufferx_reg, buffer, epsb);
port_buffer->buffer[i].size =
MLX5_GET(bufferx_reg, buffer, size) * port_buff_cell_sz;
port_buffer->buffer[i].xon =
MLX5_GET(bufferx_reg, buffer, xon_threshold) * port_buff_cell_sz;
port_buffer->buffer[i].xoff =
MLX5_GET(bufferx_reg, buffer, xoff_threshold) * port_buff_cell_sz;
total_used += port_buffer->buffer[i].size;
mlx5e_dbg(HW, priv, "buffer %d: size=%d, xon=%d, xoff=%d, epsb=%d, lossy=%d\n", i,
port_buffer->buffer[i].size,
port_buffer->buffer[i].xon,
port_buffer->buffer[i].xoff,
port_buffer->buffer[i].epsb,
port_buffer->buffer[i].lossy);
}
port_buffer->port_buffer_size =
MLX5_GET(pbmc_reg, out, port_buffer_size) * port_buff_cell_sz;
port_buffer->spare_buffer_size =
port_buffer->port_buffer_size - total_used;
mlx5e_dbg(HW, priv, "total buffer size=%d, spare buffer size=%d\n",
port_buffer->port_buffer_size,
port_buffer->spare_buffer_size);
out:
kfree(out);
return err;
}
static int port_set_buffer(struct mlx5e_priv *priv,
struct mlx5e_port_buffer *port_buffer)
{
u16 port_buff_cell_sz = priv->dcbx.port_buff_cell_sz;
struct mlx5_core_dev *mdev = priv->mdev;
int sz = MLX5_ST_SZ_BYTES(pbmc_reg);
void *in;
int err;
int i;
in = kzalloc(sz, GFP_KERNEL);
if (!in)
return -ENOMEM;
err = mlx5e_port_query_pbmc(mdev, in);
if (err)
goto out;
for (i = 0; i < MLX5E_MAX_BUFFER; i++) {
void *buffer = MLX5_ADDR_OF(pbmc_reg, in, buffer[i]);
u64 size = port_buffer->buffer[i].size;
u64 xoff = port_buffer->buffer[i].xoff;
u64 xon = port_buffer->buffer[i].xon;
do_div(size, port_buff_cell_sz);
do_div(xoff, port_buff_cell_sz);
do_div(xon, port_buff_cell_sz);
MLX5_SET(bufferx_reg, buffer, size, size);
MLX5_SET(bufferx_reg, buffer, lossy, port_buffer->buffer[i].lossy);
MLX5_SET(bufferx_reg, buffer, xoff_threshold, xoff);
MLX5_SET(bufferx_reg, buffer, xon_threshold, xon);
}
err = mlx5e_port_set_pbmc(mdev, in);
out:
kfree(in);
return err;
}
/* xoff = ((301+2.16 * len [m]) * speed [Gbps] + 2.72 MTU [B])
* minimum speed value is 40Gbps
*/
static u32 calculate_xoff(struct mlx5e_priv *priv, unsigned int mtu)
{
u32 speed;
u32 xoff;
int err;
err = mlx5e_port_linkspeed(priv->mdev, &speed);
if (err)
speed = SPEED_40000;
speed = max_t(u32, speed, SPEED_40000);
xoff = (301 + 216 * priv->dcbx.cable_len / 100) * speed / 1000 + 272 * mtu / 100;
mlx5e_dbg(HW, priv, "%s: xoff=%d\n", __func__, xoff);
return xoff;
}
static int update_xoff_threshold(struct mlx5e_port_buffer *port_buffer,
u32 xoff, unsigned int max_mtu, u16 port_buff_cell_sz)
{
int i;
for (i = 0; i < MLX5E_MAX_BUFFER; i++) {
if (port_buffer->buffer[i].lossy) {
port_buffer->buffer[i].xoff = 0;
port_buffer->buffer[i].xon = 0;
continue;
}
if (port_buffer->buffer[i].size <
(xoff + max_mtu + port_buff_cell_sz)) {
pr_err("buffer_size[%d]=%d is not enough for lossless buffer\n",
i, port_buffer->buffer[i].size);
return -ENOMEM;
}
port_buffer->buffer[i].xoff = port_buffer->buffer[i].size - xoff;
port_buffer->buffer[i].xon =
port_buffer->buffer[i].xoff - max_mtu;
}
return 0;
}
/**
* update_buffer_lossy - Update buffer configuration based on pfc
* @max_mtu: netdev's max_mtu
* @pfc_en: current pfc configuration
* @buffer: current prio to buffer mapping
* @xoff: xoff value
* @port_buff_cell_sz: port buffer cell_size
* @port_buffer: