path: root/drivers/net/ethernet/intel/i40e/i40e_lan_hmc.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2013 - 2018 Intel Corporation. */

#include "i40e.h"
#include "i40e_osdep.h"
#include "i40e_register.h"
#include "i40e_type.h"
#include "i40e_hmc.h"
#include "i40e_lan_hmc.h"
#include "i40e_prototype.h"

/* lan specific interface functions */

/**
 * i40e_align_l2obj_base - aligns base object pointer to 512 bytes
 * @offset: base address offset needing alignment
 *
 * Aligns the layer 2 function private memory so it's 512-byte aligned.
 **/
static u64 i40e_align_l2obj_base(u64 offset)
{
	u64 aligned_offset = offset;

	if ((offset % I40E_HMC_L2OBJ_BASE_ALIGNMENT) > 0)
		aligned_offset += (I40E_HMC_L2OBJ_BASE_ALIGNMENT -
				   (offset % I40E_HMC_L2OBJ_BASE_ALIGNMENT));

	return aligned_offset;
}

/**
 * i40e_calculate_l2fpm_size - calculates layer 2 FPM memory size
 * @txq_num: number of Tx queues needing backing context
 * @rxq_num: number of Rx queues needing backing context
 * @fcoe_cntx_num: amount of FCoE statefull contexts needing backing context
 * @fcoe_filt_num: number of FCoE filters needing backing context
 *
 * Calculates the maximum amount of memory for the function required, based
 * on the number of resources it must provide context for.
 **/
static u64 i40e_calculate_l2fpm_size(u32 txq_num, u32 rxq_num,
			      u32 fcoe_cntx_num, u32 fcoe_filt_num)
{
	u64 fpm_size = 0;

	fpm_size = txq_num * I40E_HMC_OBJ_SIZE_TXQ;
	fpm_size = i40e_align_l2obj_base(fpm_size);

	fpm_size += (rxq_num * I40E_HMC_OBJ_SIZE_RXQ);
	fpm_size = i40e_align_l2obj_base(fpm_size);

	fpm_size += (fcoe_cntx_num * I40E_HMC_OBJ_SIZE_FCOE_CNTX);
	fpm_size = i40e_align_l2obj_base(fpm_size);

	fpm_size += (fcoe_filt_num * I40E_HMC_OBJ_SIZE_FCOE_FILT);
	fpm_size = i40e_align_l2obj_base(fpm_size);

	return fpm_size;
}

/**
 * i40e_init_lan_hmc - initialize i40e_hmc_info struct
 * @hw: pointer to the HW structure
 * @txq_num: number of Tx queues needing backing context
 * @rxq_num: number of Rx queues needing backing context
 * @fcoe_cntx_num: amount of FCoE statefull contexts needing backing context
 * @fcoe_filt_num: number of FCoE filters needing backing context
 *
 * This function will be called once per physical function initialization.
 * It will fill out the i40e_hmc_obj_info structure for LAN objects based on
 * the driver's provided input, as well as information from the HMC itself
 * loaded from NVRAM.
 *
 * Assumptions:
 *   - HMC Resource Profile has been selected before calling this function.
 **/
i40e_status i40e_init_lan_hmc(struct i40e_hw *hw, u32 txq_num,
					u32 rxq_num, u32 fcoe_cntx_num,
					u32 fcoe_filt_num)
{
	struct i40e_hmc_obj_info *obj, *full_obj;
	i40e_status ret_code = 0;
	u64 l2fpm_size;
	u32 size_exp;

	hw->hmc.signature = I40E_HMC_INFO_SIGNATURE;
	hw->hmc.hmc_fn_id = hw->pf_id;

	/* allocate memory for hmc_obj */
	ret_code = i40e_allocate_virt_mem(hw, &hw->hmc.hmc_obj_virt_mem,
			sizeof(struct i40e_hmc_obj_info) * I40E_HMC_LAN_MAX);
	if (ret_code)
		goto init_lan_hmc_out;
	hw->hmc.hmc_obj = (struct i40e_hmc_obj_info *)
			  hw->hmc.hmc_obj_virt_mem.va;

	/* The full object will be used to create the LAN HMC SD */
	full_obj = &hw->hmc.hmc_obj[I40E_HMC_LAN_FULL];
	full_obj->max_cnt = 0;
	full_obj->cnt = 0;
	full_obj->base = 0;
	full_obj->size = 0;

	/* Tx queue context information */
	obj = &hw->hmc.hmc_obj[I40E_HMC_LAN_TX];
	obj->max_cnt = rd32(hw, I40E_GLHMC_LANQMAX);
	obj->cnt = txq_num;
	obj->base = 0;
	size_exp = rd32(hw, I40E_GLHMC_LANTXOBJSZ);
	obj->size = BIT_ULL(size_exp);

	/* validate values requested by driver don't exceed HMC capacity */
	if (txq_num > obj->max_cnt) {
		ret_code = I40E_ERR_INVALID_HMC_OBJ_COUNT;
		hw_dbg(hw, "i40e_init_lan_hmc: Tx context: asks for 0x%x but max allowed is 0x%x, returns error %d\n",
			  txq_num, obj->max_cnt, ret_code);
		goto init_lan_hmc_out;
	}

	/* aggregate values into the full LAN object for later */
	full_obj->max_cnt += obj->max_cnt;
	full_obj->cnt += obj->cnt;

	/* Rx queue context information */
	obj = &hw->