linux/drivers/net/ethernet/wangxun/txgbe/txgbe_fdir.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2015 - 2024 Beijing WangXun Technology Co., Ltd. */

#include <linux/string.h>
#include <linux/types.h>
#include <linux/pci.h>

#include "../libwx/wx_type.h"
#include "../libwx/wx_lib.h"
#include "../libwx/wx_hw.h"
#include "txgbe_type.h"
#include "txgbe_fdir.h"

/* These defines allow us to quickly generate all of the necessary instructions
 * in the function below by simply calling out TXGBE_COMPUTE_SIG_HASH_ITERATION
 * for values 0 through 15
 */
#define TXGBE_ATR_COMMON_HASH_KEY …
#define TXGBE_COMPUTE_SIG_HASH_ITERATION(_n) …

/**
 *  txgbe_atr_compute_sig_hash - Compute the signature hash
 *  @input: input bitstream to compute the hash on
 *  @common: compressed common input dword
 *  @hash: pointer to the computed hash
 *
 *  This function is almost identical to the function above but contains
 *  several optimizations such as unwinding all of the loops, letting the
 *  compiler work out all of the conditional ifs since the keys are static
 *  defines, and computing two keys at once since the hashed dword stream
 *  will be the same for both keys.
 **/
static void txgbe_atr_compute_sig_hash(union txgbe_atr_hash_dword input,
				       union txgbe_atr_hash_dword common,
				       u32 *hash)
{ … }

#define TXGBE_COMPUTE_BKT_HASH_ITERATION(_n) …

/**
 *  txgbe_atr_compute_perfect_hash - Compute the perfect filter hash
 *  @input: input bitstream to compute the hash on
 *  @input_mask: mask for the input bitstream
 *
 *  This function serves two main purposes.  First it applies the input_mask
 *  to the atr_input resulting in a cleaned up atr_input data stream.
 *  Secondly it computes the hash and stores it in the bkt_hash field at
 *  the end of the input byte stream.  This way it will be available for
 *  future use without needing to recompute the hash.
 **/
void txgbe_atr_compute_perfect_hash(union txgbe_atr_input *input,
				    union txgbe_atr_input *input_mask)
{ … }

static int txgbe_fdir_check_cmd_complete(struct wx *wx)
{ … }

/**
 *  txgbe_fdir_add_signature_filter - Adds a signature hash filter
 *  @wx: pointer to hardware structure
 *  @input: unique input dword
 *  @common: compressed common input dword
 *  @queue: queue index to direct traffic to
 *
 *  @return: 0 on success and negative on failure
 **/
static int txgbe_fdir_add_signature_filter(struct wx *wx,
					   union txgbe_atr_hash_dword input,
					   union txgbe_atr_hash_dword common,
					   u8 queue)
{ … }

void txgbe_atr(struct wx_ring *ring, struct wx_tx_buffer *first, u8 ptype)
{ … }

int txgbe_fdir_set_input_mask(struct wx *wx, union txgbe_atr_input *input_mask)
{ … }

int txgbe_fdir_write_perfect_filter(struct wx *wx,
				    union txgbe_atr_input *input,
				    u16 soft_id, u8 queue)
{ … }

int txgbe_fdir_erase_perfect_filter(struct wx *wx,
				    union txgbe_atr_input *input,
				    u16 soft_id)
{ … }

/**
 *  txgbe_fdir_enable - Initialize Flow Director control registers
 *  @wx: pointer to hardware structure
 *  @fdirctrl: value to write to flow director control register
 **/
static void txgbe_fdir_enable(struct wx *wx, u32 fdirctrl)
{ … }

/**
 *  txgbe_init_fdir_signature -Initialize Flow Director sig filters
 *  @wx: pointer to hardware structure
 **/
static void txgbe_init_fdir_signature(struct wx *wx)
{ … }

/**
 *  txgbe_init_fdir_perfect - Initialize Flow Director perfect filters
 *  @wx: pointer to hardware structure
 **/
static void txgbe_init_fdir_perfect(struct wx *wx)
{ … }

static void txgbe_fdir_filter_restore(struct wx *wx)
{ … }

void txgbe_configure_fdir(struct wx *wx)
{ … }

void txgbe_fdir_filter_exit(struct wx *wx)
{ … }