/*
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* Copyright (C) 2016 Spreadtrum Communications Inc.
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*
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* Authors:
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __SPRDWL_TCP_ACK_H__
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#define __SPRDWL_TCP_ACK_H__
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#include "msg.h"
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#define SPRDWL_TCP_ACK_NUM 32
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#define SPRDWL_TCP_ACK_EXIT_VAL 0x800
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#define SPRDWL_TCP_ACK_DROP_CNT 24
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#define SPRDWL_ACK_OLD_TIME 4000
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#define SPRDWL_U32_BEFORE(a, b) ((__s32)((__u32)a - (__u32)b) <= 0)
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#define MAX_TCP_ACK 200
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/*min window size in KB, it's 256KB*/
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#define MIN_WIN 256
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#define SIZE_KB 1024
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extern unsigned int tcp_ack_drop_cnt;
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struct sprdwl_tcp_ack_msg {
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u16 source;
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u16 dest;
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s32 saddr;
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s32 daddr;
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u32 seq;
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u16 win;
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};
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struct sprdwl_tcp_ack_info {
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int ack_info_num;
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int busy;
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int drop_cnt;
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int psh_flag;
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u32 psh_seq;
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u16 win_scale;
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/* seqlock for ack info */
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seqlock_t seqlock;
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unsigned long last_time;
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unsigned long timeout;
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struct timer_list timer;
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struct sprdwl_msg_buf *msgbuf;
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struct sprdwl_msg_buf *in_send_msg;
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struct sprdwl_tcp_ack_msg ack_msg;
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};
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struct sprdwl_tcp_ack_manage {
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/* 1 filter */
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atomic_t enable;
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int max_num;
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int free_index;
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unsigned long last_time;
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unsigned long timeout;
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atomic_t max_drop_cnt;
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/* lock for tcp ack alloc and free */
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spinlock_t lock;
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struct sprdwl_priv *priv;
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struct sprdwl_tcp_ack_info ack_info[SPRDWL_TCP_ACK_NUM];
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/*size in KB*/
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unsigned int ack_winsize;
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};
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void sprdwl_tcp_ack_init(struct sprdwl_priv *priv);
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void sprdwl_tcp_ack_deinit(struct sprdwl_priv *priv);
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void sprdwl_filter_rx_tcp_ack(struct sprdwl_priv *priv,
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unsigned char *buf, unsigned int plen);
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/* return val: 0 for not fileter, 1 for fileter */
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int sprdwl_filter_send_tcp_ack(struct sprdwl_priv *priv,
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struct sprdwl_msg_buf *msgbuf,
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unsigned char *buf, unsigned int plen);
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void enable_tcp_ack_delay(char *buf, unsigned char offset);
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void adjust_tcp_ack_delay(char *buf, unsigned char offset);
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void sprdwl_move_tcpack_msg(struct sprdwl_priv *priv,
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struct sprdwl_msg_buf *msg);
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void adjust_tcp_ack_delay_win(char *buf, unsigned char offset);
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#endif
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