esp_sip.c

/*
 * Copyright (c) 2009 - 2014 Espressif System.
 *
 * Serial Interconnctor Protocol
 */

#include <linux/ieee80211.h>
#include <net/mac80211.h>
#include <net/cfg80211.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <linux/version.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/host.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/sd.h>
#include <linux/completion.h> 

#include "esp_mac80211.h"
#include "esp_pub.h"
#include "esp_sip.h"
#include "esp_ctrl.h"
#include "esp_sif.h"
#include "esp_debug.h"
#include "slc_host_register.h"
#include "esp_wmac.h"
#include "esp_utils.h"
#ifdef TEST_MODE
#include "testmode.h"
#endif

#ifdef USE_EXT_GPIO
#include "esp_ext.h"
#endif /* USE_EXT_GPIO */

extern struct completion *gl_bootup_cplx; 

static int old_signal = -35;
static int avg_signal = 0;
static int signal_loop = 0;

struct esp_mac_prefix esp_mac_prefix_table[] = {
	{0,{0x18,0xfe,0x34}},
	{1,{0xac,0xd0,0x74}},
	{255,{0x18,0xfe,0x34}},
};

#define SIGNAL_COUNT  300

#define TID_TO_AC(_tid) ((_tid)== 0||((_tid)==3)?WME_AC_BE:((_tid)<3)?WME_AC_BK:((_tid)<6)?WME_AC_VI:WME_AC_VO)

#ifdef SIP_DEBUG
#define esp_sip_dbg esp_dbg
struct sip_trace {
        u32 tx_data;
        u32 tx_cmd;
        u32 rx_data;
        u32 rx_evt;
        u32 rx_tx_status;
        u32 tx_out_of_credit;
        u32 tx_one_shot_overflow;
};
static struct sip_trace str;
#define STRACE_TX_DATA_INC() (str.tx_data++)
#define STRACE_TX_CMD_INC()  (str.tx_cmd++)
#define STRACE_RX_DATA_INC() (str.rx_data++)
#define STRACE_RX_EVENT_INC() (str.rx_evt++)
#define STRACE_RX_TXSTATUS_INC() (str.rx_tx_status++)
#define STRACE_TX_OUT_OF_CREDIT_INC() (str.tx_out_of_credit++)
#define STRACE_TX_ONE_SHOT_INC() (str.tx_one_shot_overflow++)
#define STRACE_SHOW(sip)
#else
#define esp_sip_dbg(...)
#define STRACE_TX_DATA_INC()
#define STRACE_TX_CMD_INC()
#define STRACE_RX_DATA_INC()
#define STRACE_RX_EVENT_INC()
#define STRACE_RX_TXSTATUS_INC()
#define STRACE_TX_OUT_OF_CREDIT_INC()
#define STRACE_TX_ONE_SHOT_INC()
#define STRACE_SHOW(sip)
#endif /* SIP_DEBUG */

#define SIP_STOP_QUEUE_THRESHOLD 48
#define SIP_RESUME_QUEUE_THRESHOLD  12
#ifndef FAST_TX_STATUS
#define SIP_PENDING_STOP_TX_THRESHOLD 6
#define SIP_PENDING_RESUME_TX_THRESHOLD 6
#endif /* !FAST_TX_STATUS */

#define SIP_MIN_DATA_PKT_LEN    (sizeof(struct esp_mac_rx_ctrl) + 24) //24 is min 80211hdr

#ifdef ESP_PREALLOC
extern struct sk_buff *esp_get_sip_skb(int size);
extern void esp_put_sip_skb(struct sk_buff **skb);

extern u8 *esp_get_tx_aggr_buf(void);
extern void esp_put_tx_aggr_buf(u8 **p);

#endif

static void sip_recalc_credit_init(struct esp_sip *sip);

static int sip_recalc_credit_claim(struct esp_sip *sip, int force);

static void sip_recalc_credit_release(struct esp_sip *sip);

static struct sip_pkt *sip_get_ctrl_buf(struct esp_sip *sip, SIP_BUF_TYPE bftype);

static void sip_reclaim_ctrl_buf(struct esp_sip *sip, struct sip_pkt *pkt, SIP_BUF_TYPE bftype);

static void sip_free_init_ctrl_buf(struct esp_sip *sip);

static int sip_pack_pkt(struct esp_sip *sip, struct sk_buff *skb, int *pm_state);

static struct esp_mac_rx_ctrl *sip_parse_normal_mac_ctrl(struct sk_buff *skb, int * pkt_len_enc, int *buf_len, int *pulled_len);

static struct sk_buff * sip_parse_data_rx_info(struct esp_sip *sip, struct sk_buff *skb, int pkt_len_enc, int buf_len, struct esp_mac_rx_ctrl *mac_ctrl, int *pulled_len);

static inline void sip_rx_pkt_enqueue(struct esp_sip *sip, struct sk_buff *skb);

#ifndef FAST_TX_STATUS
static void sip_after_tx_status_update(struct esp_sip *sip);
#endif /* !FAST_TX_STATUS */

static void sip_after_write_pkts(struct esp_sip *sip);

static void sip_update_tx_credits(struct esp_sip *sip, u16 recycled_credits);

//static void sip_trigger_txq_process(struct esp_sip *sip);

static bool sip_rx_pkt_process(struct esp_sip * sip, struct sk_buff *skb);

#ifdef FAST_TX_STATUS
static void sip_tx_status_report(struct esp_sip *sip, struct sk_buff *skb, struct ieee80211_tx_info* tx_info, bool success);
#endif /* FAST_TX_STATUS */

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35))
static void sip_check_skb_alignment(struct sk_buff *skb);
#endif /* NEW_KERNEL */

#ifdef FPGA_TXDATA
int sip_send_tx_data(struct esp_sip *sip);
#endif/* FPGA_TXDATA */

#ifdef FPGA_LOOPBACK
int sip_send_loopback_cmd_mblk(struct esp_sip *sip);
#endif /* FPGA_LOOPBACK */

static bool check_ac_tid(u8 *pkt, u8 ac, u8 tid)
{
        struct ieee80211_hdr * wh = (struct ieee80211_hdr *)pkt;
#ifdef TID_DEBUG
        u16 real_tid = 0;
#endif //TID_DEBUG

        if (ieee80211_is_data_qos(wh->frame_control)) {
#ifdef TID_DEBUG
		real_tid = *ieee80211_get_qos_ctl(wh) & IEEE80211_QOS_CTL_TID_MASK;

                esp_sip_dbg(ESP_SHOW, "ac:%u, tid:%u, tid in pkt:%u\n", ac, tid, real_tid);
                if (tid != real_tid) {
                        esp_sip_dbg(ESP_DBG_ERROR, "111 ac:%u, tid:%u, tid in pkt:%u\n", ac, tid, real_tid);
                }
                if (TID_TO_AC(tid) != ac) {
                        esp_sip_dbg(ESP_DBG_ERROR, "222 ac:%u, tid:%u, tid in pkt:%u\n", ac, tid, real_tid);
                }

#endif /* TID_DEBUG*/
        } else if (ieee80211_is_mgmt(wh->frame_control)) {
#ifdef TID_DEBUG
                esp_sip_dbg(ESP_SHOW, "ac:%u, tid:%u\n", ac, tid);
                if (tid != 7 || ac != WME_AC_VO) {
                        esp_sip_dbg(ESP_DBG_ERROR, "333 ac:%u, tid:%u\n", ac, tid);
                }
#endif /* TID_DEBUG*/
        } else {
                if (ieee80211_is_ctl(wh->frame_control)) {
#ifdef TID_DEBUG
                        esp_sip_dbg(ESP_SHOW, "%s is ctrl pkt fc 0x%04x ac:%u, tid:%u, tid in pkt:%u\n", __func__, wh->frame_control, ac, tid, real_tid);
#endif /* TID_DEBUG*/
                } else {
                        if (tid != 0 || ac != WME_AC_BE) {
                                //show_buf(pkt, 24);
                                esp_sip_dbg(ESP_DBG_LOG, "444 ac:%u, tid:%u \n", ac, tid);
                                if (tid == 7 && ac == WME_AC_VO)
                                        return false;
                        }
                        return true; //hack to modify non-qos null data.

                }
        }

        return false;
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,14,0))
static void sip_recalc_credit_timeout(struct timer_list *list)
{
	struct esp_sip *sip = from_timer(sip,list,credit_timer);
#else
static void sip_recalc_credit_timeout(unsigned long data)
{
	struct esp_sip *sip = (struct esp_sip *)data;
#endif
	esp_dbg(ESP_DBG_ERROR, "rct");

	sip_recalc_credit_claim(sip, 1);      /* recalc again */
}

static void sip_recalc_credit_init(struct esp_sip *sip)
{
	atomic_set(&sip->credit_status, RECALC_CREDIT_DISABLE);  //set it disable
	#if  (LINUX_VERSION_CODE >= KERNEL_VERSION(4,14,0))
	timer_setup(&sip->credit_timer, sip_recalc_credit_timeout,0);
	#else
	init_timer(&sip->credit_timer);
	sip->credit_timer.data = (unsigned long)sip;
        sip->credit_timer.function = sip_recalc_credit_timeout;
	#endif
}

static int sip_recalc_credit_claim(struct esp_sip *sip, int force)
{
	int ret;

	if (atomic_read(&sip->credit_status) == RECALC_CREDIT_ENABLE && force == 0)
		return 1;

	atomic_set(&sip->credit_status, RECALC_CREDIT_ENABLE);
        ret = sip_send_recalc_credit(sip->epub);
	if (ret) {
		esp_dbg(ESP_DBG_ERROR, "%s error %d", __func__, ret);
		return ret;
	}
	/*setup a timer for handle the abs_credit not receive */
	mod_timer(&sip->credit_timer, jiffies + msecs_to_jiffies(2000));
	
	esp_dbg(ESP_SHOW, "rcc");

	return ret;
}

static void sip_recalc_credit_release(struct esp_sip *sip)
{
	esp_dbg(ESP_SHOW, "rcr");

	if (atomic_read(&sip->credit_status) == RECALC_CREDIT_ENABLE) {
		atomic_set(&sip->credit_status, RECALC_CREDIT_DISABLE);
		del_timer_sync(&sip->credit_timer);
	} else
		esp_dbg(ESP_SHOW, "maybe bogus credit");
}

static void sip_update_tx_credits(struct esp_sip *sip, u16 recycled_credits)
{
        esp_sip_dbg(ESP_DBG_TRACE, "%s:before add, credits is %d\n", __func__, atomic_read(&sip->tx_credits));
        
	if (recycled_credits & 0x800) {
		atomic_set(&sip->tx_credits, (recycled_credits & 0x7ff));
		sip_recalc_credit_release(sip);
	} else
		atomic_add(recycled_credits, &sip->tx_credits);

        esp_sip_dbg(ESP_DBG_TRACE, "%s:after add %d, credits is %d\n", __func__, recycled_credits, atomic_read(&sip->tx_credits));
}

void sip_trigger_txq_process(struct esp_sip *sip)
{
        if (atomic_read(&sip->tx_credits) <= sip->credit_to_reserve + SIP_CTRL_CREDIT_RESERVE             //no credits, do nothing
		|| atomic_read(&sip->credit_status) == RECALC_CREDIT_ENABLE)
                return;

        if (sip_queue_may_resume(sip)) {
                /* wakeup upper queue only if we have sufficient credits */
                esp_sip_dbg(ESP_DBG_TRACE, "%s wakeup ieee80211 txq \n", __func__);
                atomic_set(&sip->epub->txq_stopped, false);
                ieee80211_wake_queues(sip->epub->hw);
        } else if (atomic_read(&sip->epub->txq_stopped) ) {
                esp_sip_dbg(ESP_DBG_TRACE, "%s can't wake txq, credits: %d \n", __func__, atomic_read(&sip->tx_credits) );
        }

        if (!skb_queue_empty(&sip->epub->txq)) {
                /* try to send out pkt already in sip queue once we have credits */
                esp_sip_dbg(ESP_DBG_TRACE, "%s resume sip txq \n", __func__);

#if !defined(FPGA_TXDATA) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 32))
                if(sif_get_ate_config() == 0){
                        ieee80211_queue_work(sip->epub->hw, &sip->epub->tx_work);
                } else {
                        queue_work(sip->epub->esp_wkq, &sip->epub->tx_work);
                } 
#else
                queue_work(sip->epub->esp_wkq, &sip->epub->tx_work);
#endif
        }
}

static bool sip_ampdu_occupy_buf(struct esp_sip *sip, struct esp_rx_ampdu_len * ampdu_len)
{
        return (ampdu_len->substate == 0 || esp_wmac_rxsec_error(ampdu_len->substate) || (sip->dump_rpbm_err && ampdu_len->substate == RX_RPBM_ERR));
}

static bool sip_rx_pkt_process(struct esp_sip * sip, struct sk_buff *skb)
{
#define DO_NOT_COPY false
#define DO_COPY true

	struct sip_hdr * hdr = NULL;
	struct sk_buff * rskb = NULL;
	int remains_len = 0;
	int first_pkt_len = 0;
	u8 *bufptr = NULL;
	int ret = 0;
	bool trigger_rxq = false;

	if (skb == NULL) {
		esp_sip_dbg(ESP_DBG_ERROR, "%s NULL SKB!!!!!!!! \n", __func__);
		return trigger_rxq;
	}

	hdr = (struct sip_hdr *)skb->data;
	bufptr = skb->data;


	esp_sip_dbg(ESP_DBG_TRACE, "%s Hcredits 0x%08x, realCredits %d\n", __func__, hdr->h_credits, hdr->h_credits & SIP_CREDITS_MASK);
	if (hdr->h_credits & SIP_CREDITS_MASK) {
		sip_update_tx_credits(sip, hdr->h_credits & SIP_CREDITS_MASK);
	}

	hdr->h_credits &= ~SIP_CREDITS_MASK; /* clean credits in sip_hdr, prevent over-add */

	esp_sip_dbg(ESP_DBG_TRACE, "%s credits %d\n", __func__, hdr->h_credits);

	/*
	 * first pkt's length is stored in  recycled_credits first 20 bits
	 * config w3 [31:12]
	 * repair hdr->len of first pkt
	 */
	remains_len = hdr->len;
	first_pkt_len = hdr->h_credits >> 12;
	hdr->len = first_pkt_len;

	esp_dbg(ESP_DBG_TRACE, "%s first_pkt_len %d, whole pkt len %d \n", __func__, first_pkt_len, remains_len);
	if (first_pkt_len > remains_len) {
		sip_recalc_credit_claim(sip, 0);
		esp_dbg(ESP_DBG_ERROR, "first_pkt_len %d, whole pkt len %d\n", first_pkt_len, remains_len);
		show_buf((u8 *)hdr, first_pkt_len);
		ESSERT(0);
                goto _exit;
	}

	/*
	 * pkts handling, including the first pkt, should alloc new skb for each data pkt.
	 * free the original whole skb after parsing is done.
	 */
	while (remains_len) {
		if (remains_len < sizeof(struct sip_hdr)) {
			sip_recalc_credit_claim(sip, 0);
			ESSERT(0);
			show_buf((u8 *)hdr, 512);
                	goto _exit;
		}
		
		hdr = (struct sip_hdr *)bufptr;
		if (hdr->len <= 0) {
			sip_recalc_credit_claim(sip, 0);
			show_buf((u8 *)hdr, 512);
			ESSERT(0);
			goto _exit;
		}

		if((hdr->len & 3) != 0) {
			sip_recalc_credit_claim(sip, 0);
			show_buf((u8 *)hdr, 512);
			ESSERT(0);
                	goto _exit;
		}
		if (unlikely(hdr->seq != sip->rxseq++)) {
			sip_recalc_credit_claim(sip, 0);
			esp_dbg(ESP_DBG_ERROR, "%s seq mismatch! got %u, expect %u\n", __func__, hdr->seq, sip->rxseq-1);
			sip->rxseq = hdr->seq + 1;
			show_buf(bufptr, 32);
			ESSERT(0);
		}

		if (SIP_HDR_IS_CTRL(hdr)) {
			STRACE_RX_EVENT_INC();
			esp_sip_dbg(ESP_DBG_TRACE, "seq %u \n", hdr->seq);

			ret = sip_parse_events(sip, bufptr);

			skb_pull(skb, hdr->len);

		} else if (SIP_HDR_IS_DATA(hdr)) {
			struct esp_mac_rx_ctrl * mac_ctrl = NULL;
			int pkt_len_enc = 0, buf_len = 0, pulled_len = 0;

			STRACE_RX_DATA_INC();
			esp_sip_dbg(ESP_DBG_TRACE, "seq %u \n", hdr->seq);
			mac_ctrl = sip_parse_normal_mac_ctrl(skb, &pkt_len_enc, &buf_len, &pulled_len);
			rskb = sip_parse_data_rx_info(sip, skb, pkt_len_enc, buf_len, mac_ctrl, &pulled_len);

			if(rskb == NULL)
				goto _move_on;

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35))
			sip_check_skb_alignment(rskb);
#endif /* !NEW_KERNEL */
			if (likely(atomic_read(&sip->epub->wl.off) == 0)) {
#ifndef RX_SENDUP_SYNC
				skb_queue_tail(&sip->epub->rxq, rskb);
				trigger_rxq = true;
#else
#ifdef RX_CHECKSUM_TEST
				esp_rx_checksum_test(rskb);
#endif
				local_bh_disable();
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 32))
				ieee80211_rx(sip->epub->hw, rskb);
#else
                //simulate IEEE80211_SKB_RXCB in 2.6.32 
                ieee80211_rx(sip->epub->hw, rskb ,(struct ieee80211_rx_status *)rskb->cb);
#endif
				local_bh_enable();
#endif /* RX_SENDUP_SYNC */
			} else {
				/* still need go thro parsing as skb_pull should invoke */
				kfree_skb(rskb);
			}
		} else if (SIP_HDR_IS_AMPDU(hdr)) {
			struct esp_mac_rx_ctrl * mac_ctrl = NULL;
			struct esp_mac_rx_ctrl new_mac_ctrl;
			struct esp_rx_ampdu_len *ampdu_len;
			int pkt_num;
			int pulled_len = 0;
			static int pkt_dropped = 0;
			static int pkt_total = 0;
			bool have_rxabort = false;
			bool have_goodpkt = false;
			static u8 frame_head[16];
			static u8 frame_buf_ttl = 0;

			ampdu_len = (struct esp_rx_ampdu_len *)(skb->data + hdr->len/sip->rx_blksz * sip->rx_blksz);
			esp_sip_dbg(ESP_DBG_TRACE, "%s rx ampdu total len %u\n", __func__, hdr->len);
			if(skb->data != (u8 *)hdr) {
				printk("%p %p\n", skb->data, hdr);
				show_buf(skb->data, 512);
				show_buf((u8 *)hdr, 512);
				ESSERT(0);
				goto _exit;
			}
			mac_ctrl = sip_parse_normal_mac_ctrl(skb, NULL, NULL, &pulled_len);
			memcpy(&new_mac_ctrl, mac_ctrl, sizeof(struct esp_mac_rx_ctrl));
			mac_ctrl = &new_mac_ctrl;
			pkt_num = mac_ctrl->ampdu_cnt;
			esp_sip_dbg(ESP_DBG_TRACE, "%s %d rx ampdu %u pkts, %d pkts dumped, first len %u\n",__func__,
				__LINE__, (unsigned int)((hdr->len % sip->rx_blksz) / sizeof(struct esp_rx_ampdu_len)),
				pkt_num, (unsigned int)ampdu_len->sublen);

			pkt_total += mac_ctrl->ampdu_cnt;
			//esp_sip_dbg(ESP_DBG_ERROR, "%s ampdu dropped %d/%d\n", __func__, pkt_dropped, pkt_total);
			while (pkt_num > 0) {
				esp_sip_dbg(ESP_DBG_TRACE, "%s %d ampdu sub state %02x,\n", __func__, __LINE__,
					ampdu_len->substate);

				if (sip_ampdu_occupy_buf(sip, ampdu_len)) { //pkt is dumped

					rskb = sip_parse_data_rx_info(sip, skb, ampdu_len->sublen - FCS_LEN, 0, mac_ctrl, &pulled_len);
					if (!rskb) {
						ESSERT(0);
						goto _exit;
					}

					if (likely(atomic_read(&sip->epub->wl.off) == 0) &&
							(ampdu_len->substate == 0 || ampdu_len->substate == RX_TKIPMIC_ERR ||
							 (sip->sendup_rpbm_pkt && ampdu_len->substate == RX_RPBM_ERR)) &&
							(sip->rxabort_fixed || !have_rxabort) ) 
					{
						if(!have_goodpkt) {
							have_goodpkt = true;
							memcpy(frame_head, rskb->data, 16);
							frame_head[1] &= ~0x80;
							frame_buf_ttl = 3;
						}
#ifndef RX_SENDUP_SYNC
						skb_queue_tail(&sip->epub->rxq, rskb);
						trigger_rxq = true;
#else
#ifdef RX_CHECKSUM_TEST
						esp_rx_checksum_test(rskb);
#endif
						local_bh_disable();
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 32))
						ieee80211_rx(sip->epub->hw, rskb);
#else
                //simulate IEEE80211_SKB_RXCB in 2.6.32 
						ieee80211_rx(sip->epub->hw, rskb ,(struct ieee80211_rx_status *)rskb->cb);
#endif
						local_bh_enable();
#endif /* RX_SENDUP_SYNC */

					} else {
						kfree_skb(rskb);
					}
				} else {
					if (ampdu_len->substate == RX_ABORT) {
						u8 * a;
						have_rxabort = true;
						esp_sip_dbg(ESP_DBG_TRACE, "rx abort %d %d\n", frame_buf_ttl, pkt_num);
						if(frame_buf_ttl && !sip->rxabort_fixed) {
							struct esp_rx_ampdu_len * next_good_ampdu_len = ampdu_len + 1;
							a = frame_head;
							esp_sip_dbg(ESP_DBG_TRACE, "frame:%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
									a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], a[11], a[12], a[13], a[14], a[15]);
							while(!sip_ampdu_occupy_buf(sip, next_good_ampdu_len)) {
								if(next_good_ampdu_len > ampdu_len + pkt_num - 1)
									break;
								next_good_ampdu_len++;

							}
							if(next_good_ampdu_len <= ampdu_len + pkt_num -1) {
								bool b0, b10, b11;
								a = skb->data;
								esp_sip_dbg(ESP_DBG_TRACE, "buf:%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
										a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7], a[8], a[9], a[10], a[11], a[12], a[13], a[14], a[15]);
								b0 = memcmp(frame_head + 4, skb->data + 4, 12) == 0;
								b10 = memcmp(frame_head + 10, skb->data, 6) == 0;
								b11 = memcpy(frame_head + 11, skb->data, 5) == 0;
								esp_sip_dbg(ESP_DBG_TRACE, "com %d %d %d\n", b0, b10, b11);
								if(b0 && !b10 && !b11) {
									have_rxabort = false;
									esp_sip_dbg(ESP_DBG_TRACE, "repair 0\n");
								} else if(!b0 && b10 && !b11) {
									skb_push(skb, 10);
									memcpy(skb->data, frame_head, 10);
									have_rxabort = false;
									pulled_len -= 10;
									esp_sip_dbg(ESP_DBG_TRACE, "repair 10\n");
								} else if(!b0 && !b10 && b11) {
									skb_push(skb, 11);
									memcpy(skb->data, frame_head, 11);
									have_rxabort = false;
									pulled_len -= 11;
									esp_sip_dbg(ESP_DBG_TRACE, "repair 11\n");
								}
							}
						}
					}
					pkt_dropped++;
					esp_sip_dbg(ESP_DBG_LOG, "%s ampdu dropped %d/%d\n", __func__, pkt_dropped, pkt_total);
				}
				pkt_num--;
				ampdu_len++;
			}
			if(frame_buf_ttl)
				frame_buf_ttl--;
			skb_pull(skb, hdr->len - pulled_len);
		} else {
			esp_sip_dbg(ESP_DBG_ERROR, "%s %d unknown type\n", __func__, __LINE__);
		}

_move_on:
		if (hdr->len < remains_len) {
			remains_len -= hdr->len;
		} else {
			break;
		}
		bufptr += hdr->len;
	}

_exit:
#ifdef ESP_PREALLOC 
	esp_put_sip_skb(&skb);
#else
	kfree_skb(skb);
#endif

	return trigger_rxq;

#undef DO_NOT_COPY
#undef DO_COPY
}

static void _sip_rxq_process(struct esp_sip *sip)
{
        struct sk_buff *skb = NULL;
        bool sendup = false;

        while ((skb = skb_dequeue(&sip->rxq))) {
                if (sip_rx_pkt_process(sip, skb))
                        sendup = true;
        }
#ifndef RX_SENDUP_SYNC
        if (sendup) {
                queue_work(sip->epub->esp_wkq, &sip->epub->sendup_work);
        }
#endif /* !RX_SENDUP_SYNC */

        /* probably tx_credit is updated, try txq */
        sip_trigger_txq_process(sip);
}

void sip_rxq_process(struct work_struct *work)
{
        struct esp_sip *sip = container_of(work, struct esp_sip, rx_process_work);
	if (sip == NULL) {
        	ESSERT(0);
		return;
	}

	if (unlikely(atomic_read(&sip->state) == SIP_SEND_INIT)) {
		sip_send_chip_init(sip);
		atomic_set(&sip->state, SIP_WAIT_BOOTUP);
		return;
	}

        mutex_lock(&sip->rx_mtx);
        _sip_rxq_process(sip);
        mutex_unlock(&sip->rx_mtx);
}

static inline void sip_rx_pkt_enqueue(struct esp_sip *sip, struct sk_buff *skb)
{
        skb_queue_tail(&sip->rxq, skb);
}

static inline struct sk_buff * sip_rx_pkt_dequeue(struct esp_sip *sip) {
        return skb_dequeue(&sip->rxq);
}

static u32 sip_rx_count = 0;
void sip_debug_show(struct esp_sip *sip)
{
	esp_sip_dbg(ESP_DBG_ERROR, "txq left %d %d\n", skb_queue_len(&sip->epub->txq), atomic_read(&sip->tx_data_pkt_queued));
	esp_sip_dbg(ESP_DBG_ERROR, "tx queues stop ? %d\n", atomic_read(&sip->epub->txq_stopped));
	esp_sip_dbg(ESP_DBG_ERROR, "txq stop?  %d\n", test_bit(ESP_WL_FLAG_STOP_TXQ, &sip->epub->wl.flags));
	esp_sip_dbg(ESP_DBG_ERROR, "tx credit %d\n", atomic_read(&sip->tx_credits));
	esp_sip_dbg(ESP_DBG_ERROR, "rx collect %d\n", sip_rx_count);
	sip_rx_count = 0;
}

int sip_rx(struct esp_pub *epub)
{
        struct sip_hdr *shdr = NULL;
        struct esp_sip *sip = epub->sip;
        int err = 0;
        struct sk_buff *first_skb = NULL;
        u8 *rx_buf = NULL;
        u32 rx_blksz;
        struct sk_buff *rx_skb = NULL;

        u32 first_sz; 

        first_sz = sif_get_regs(epub)->config_w0;

	if (likely(sif_get_ate_config() != 1)) {
		do {
			u8 raw_seq = sif_get_regs(epub)->intr_raw & 0xff;

			if (raw_seq != sip->to_host_seq) {
				if (raw_seq == sip->to_host_seq + 1) { /* when last read pkt crc err, this situation may occur, but raw_seq mustn't < to_host_Seq */
					sip->to_host_seq = raw_seq;
					esp_dbg(ESP_DBG_TRACE, "warn: to_host_seq reg 0x%02x, seq 0x%02x", raw_seq, sip->to_host_seq);
					break;
				}     
				esp_dbg(ESP_DBG_ERROR, "err: to_host_seq reg 0x%02x, seq 0x%02x", raw_seq, sip->to_host_seq);
				goto _err;
			}
		} while (0);
	}
        esp_sip_dbg(ESP_DBG_LOG, "%s enter\n", __func__);


        /* first read one block out, if we luck enough, that's it
         *
         *  To make design as simple as possible, we allocate skb(s)
         *  separately for each sif read operation to avoid global
         *  read_buf_pointe access.  It coule be optimized late.
         */
        rx_blksz = sif_get_blksz(epub);
#ifdef ESP_PREALLOC
        first_skb = esp_get_sip_skb(roundup(first_sz, rx_blksz));
#else 
        first_skb = __dev_alloc_skb(roundup(first_sz, rx_blksz), GFP_KERNEL);
#endif /* ESP_PREALLOC */

        if (first_skb == NULL) {
		sif_unlock_bus(epub);
                esp_sip_dbg(ESP_DBG_ERROR, "%s first no memory \n", __func__);
                goto _err;
        }

        rx_buf = skb_put(first_skb, first_sz);
        esp_sip_dbg(ESP_DBG_LOG, "%s rx_buf ptr %p, first_sz %d\n", __func__, rx_buf, first_sz);


#ifdef USE_EXT_GPIO
	do{
		int err2 = 0;
		u16 value = 0;
		u16 intr_mask = ext_gpio_get_int_mask_reg();
		if(!intr_mask)
			break;
		value = sif_get_regs(epub)->config_w3 & intr_mask;
		if(value)
		{
			err2 = sif_interrupt_target(epub, 6);
			esp_sip_dbg(ESP_DBG, "write gpio\n");
		}

		if(!err2 && value) {
            		esp_sip_dbg(ESP_DBG_TRACE, "%s intr_mask[0x%04x] value[0x%04x]\n", __func__, intr_mask, value);
			ext_gpio_int_process(value);
		}
	}while(0);
#endif

#ifdef ESP_ACK_INTERRUPT
#ifdef ESP_ACK_LATER
		err = esp_common_read(epub, rx_buf, first_sz, ESP_SIF_NOSYNC, false);
        sif_platform_ack_interrupt(epub);
#else
        sif_platform_ack_interrupt(epub);
		err = esp_common_read(epub, rx_buf, first_sz, ESP_SIF_NOSYNC, false);
#endif /* ESP_ACK_LATER */
#else
        err = esp_common_read(epub, rx_buf, first_sz, ESP_SIF_NOSYNC, false);
#endif //ESP_ACK_INTERRUPT
	sip_rx_count++;
        if (unlikely(err)) {
                esp_dbg(ESP_DBG_ERROR, " %s first read err %d %d\n", __func__, err, sif_get_regs(epub)->config_w0);
#ifdef ESP_PREALLOC
		esp_put_sip_skb(&first_skb);
#else
                kfree_skb(first_skb);
#endif /* ESP_PREALLOC */
        	sif_unlock_bus(epub);
                goto _err;
        }

        shdr = (struct sip_hdr *)rx_buf;
	if(SIP_HDR_IS_CTRL(shdr) && (shdr->c_evtid == SIP_EVT_SLEEP)) {
		atomic_set(&sip->epub->ps.state, ESP_PM_ON);
		esp_dbg(ESP_DBG_TRACE, "s\n");
	}

	if (likely(sif_get_ate_config() != 1)) {
		sip->to_host_seq++;
	}
 
        if ((shdr->len & 3) != 0){
               esp_sip_dbg(ESP_DBG_ERROR, "%s shdr->len[%d] error\n", __func__, shdr->len);
#ifdef ESP_PREALLOC
		esp_put_sip_skb(&first_skb);
#else
                kfree_skb(first_skb);
#endif /* ESP_PREALLOC */
                sif_unlock_bus(epub);
                err = -EIO;
                goto _err;
        }
        if (shdr->len != first_sz){
		esp_sip_dbg(ESP_DBG_ERROR, "%s shdr->len[%d]  first_size[%d] error\n", __func__, shdr->len, first_sz);
#ifdef ESP_PREALLOC
		esp_put_sip_skb(&first_skb);
#else
                kfree_skb(first_skb);
#endif /* ESP_PREALLOC */
                sif_unlock_bus(epub);
                err = -EIO;
                goto _err;
        } else {
		sif_unlock_bus(epub);
                skb_trim(first_skb, shdr->len);
                esp_dbg(ESP_DBG_TRACE, " %s first_skb only\n", __func__);

                rx_skb = first_skb;
        }

        if (atomic_read(&sip->state) == SIP_STOP) {
#ifdef ESP_PREALLOC
		esp_put_sip_skb(&rx_skb);
#else
		kfree_skb(rx_skb);
#endif /* ESP_PREALLOC */
                esp_sip_dbg(ESP_DBG_ERROR, "%s when sip stopped\n", __func__);
                return 0;
        }

        sip_rx_pkt_enqueue(sip, rx_skb);
        queue_work(sip->epub->esp_wkq, &sip->rx_process_work);

_err:
        return err;
}

int sip_post_init(struct esp_sip *sip, struct sip_evt_bootup2 *bevt)
{
        struct esp_pub *epub;

        u8 mac_id = bevt->mac_addr[0];
        int mac_index = 0;
        int i = 0;

	if (sip == NULL) {
        	ESSERT(0);
		return -EINVAL;
	}

        epub = sip->epub;


        sip->tx_aggr_write_ptr = sip->tx_aggr_buf;

        sip->tx_blksz = bevt->tx_blksz;
        sip->rx_blksz = bevt->rx_blksz;
        sip->credit_to_reserve = bevt->credit_to_reserve;

        sip->dump_rpbm_err = (bevt->options & SIP_DUMP_RPBM_ERR);
        sip->rxabort_fixed = (bevt->options & SIP_RXABORT_FIXED);
        sip->support_bgscan = (bevt->options & SIP_SUPPORT_BGSCAN);

        sip->sendup_rpbm_pkt = sip->dump_rpbm_err && false;

        /* print out MAC addr... */
        memcpy(epub->mac_addr, bevt->mac_addr, ETH_ALEN);
        for(i = 0;i < sizeof(esp_mac_prefix_table)/sizeof(struct esp_mac_prefix);i++) {
		if(esp_mac_prefix_table[i].mac_index == mac_id) {
			mac_index = i;
			break;
		}
        }

        epub->mac_addr[0] = esp_mac_prefix_table[mac_index].mac_addr_prefix[0];
        epub->mac_addr[1] = esp_mac_prefix_table[mac_index].mac_addr_prefix[1];
        epub->mac_addr[2] = esp_mac_prefix_table[mac_index].mac_addr_prefix[2];

#ifdef SELF_MAC
        epub->mac_addr[0] = 0xff;            
        epub->mac_addr[1] = 0xff;        
        epub->mac_addr[2] = 0xff;             
#endif
        atomic_set(&sip->noise_floor, bevt->noise_floor);

	sip_recalc_credit_init(sip);

        esp_sip_dbg(ESP_DBG_TRACE, "%s tx_blksz %d rx_blksz %d mac addr %pM\n", __func__, sip->tx_blksz, sip->rx_blksz, epub->mac_addr);

       	return 0;
}

/* write pkts in aggr buf to target memory */
static void sip_write_pkts(struct esp_sip *sip, int pm_state)
{
        int tx_aggr_len = 0;
        struct sip_hdr *first_shdr = NULL;
	int err = 0;

        tx_aggr_len = sip->tx_aggr_write_ptr - sip->tx_aggr_buf;
        if (tx_aggr_len < sizeof(struct sip_hdr)) {
                printk("%s tx_aggr_len %d \n", __func__, tx_aggr_len);
                ESSERT(0);
		return;
        }
        if ((tx_aggr_len & 0x3) != 0) {
		ESSERT(0);
		return;
	}

        first_shdr = (struct sip_hdr *)sip->tx_aggr_buf;

        if (atomic_read(&sip->tx_credits) <= SIP_CREDITS_LOW_THRESHOLD) {
                first_shdr->fc[1] |= SIP_HDR_F_NEED_CRDT_RPT;
        }

        /* still use lock bus instead of sif_lldesc_write_sync since we want to protect several global varibles assignments */
        sif_lock_bus(sip->epub);

	err = esp_common_write(sip->epub, sip->tx_aggr_buf, tx_aggr_len, ESP_SIF_NOSYNC);

        sip->tx_aggr_write_ptr = sip->tx_aggr_buf;
        sip->tx_tot_len = 0;

        sif_unlock_bus(sip->epub);

	if (err)
		esp_sip_dbg(ESP_DBG_ERROR, "func %s err!!!!!!!!!: %d\n", __func__, err);

}

/* setup sip header and tx info, copy pkt into aggr buf */
static int sip_pack_pkt(struct esp_sip *sip, struct sk_buff *skb, int *pm_state)
{
        struct ieee80211_tx_info *itx_info;
        struct sip_hdr *shdr;
        u32 tx_len = 0, offset = 0;
        bool is_data = true;

        itx_info = IEEE80211_SKB_CB(skb);

        if (itx_info->flags == 0xffffffff) {
                shdr = (struct sip_hdr *)skb->data;
                is_data = false;
                tx_len = skb->len;
        } else {
                struct ieee80211_hdr * wh = (struct ieee80211_hdr *)skb->data;
                struct esp_vif *evif = (struct esp_vif *)itx_info->control.vif->drv_priv;
                u8 sta_index;
                struct esp_node *node;	
                /* update sip header */
                shdr = (struct sip_hdr *)sip->tx_aggr_write_ptr;
                
                shdr->fc[0] = 0;
                shdr->fc[1] = 0;

                if ((itx_info->flags & IEEE80211_TX_CTL_AMPDU) && (true || esp_is_ip_pkt(skb)))
                        SIP_HDR_SET_TYPE(shdr->fc[0], SIP_DATA_AMPDU);
                else
                        SIP_HDR_SET_TYPE(shdr->fc[0], SIP_DATA);

		if(evif->epub == NULL){
#ifndef FAST_TX_STATUS
			/* TBD */
#else
			sip_tx_status_report(sip, skb, itx_info, false);
			atomic_dec(&sip->tx_data_pkt_queued);
			return -EINVAL;
#endif /* FAST_TX_STATUS */
		}

                /* make room for encrypted pkt */
                if (itx_info->control.hw_key) {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39))
                        shdr->d_enc_flag= itx_info->control.hw_key->alg+1;
#else
                        int alg = esp_cipher2alg(itx_info->control.hw_key->cipher);
                        if (unlikely(alg == -1)) {
#ifndef FAST_TX_STATUS
                                /* TBD */
#else
                                sip_tx_status_report(sip, skb, itx_info, false);
                                atomic_dec(&sip->tx_data_pkt_queued);
                                return -1;
#endif /* FAST_TX_STATUS */
                        } else {
                                shdr->d_enc_flag = alg + 1;
                        }

#endif /* NEW_KERNEL */
                         shdr->d_hw_kid =  itx_info->control.hw_key->hw_key_idx | (evif->index<<7);
                } else {
                        shdr->d_enc_flag=0;
                        shdr->d_hw_kid = (evif->index << 7 | evif->index);
                }

                /* update sip tx info */
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 8, 0))
                node = esp_get_node_by_addr(sip->epub, wh->addr1);
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28))
                if(itx_info->control.sta == NULL){
                        node = NULL;
                } else {
                        node = esp_get_node_by_addr(sip->epub, itx_info->control.sta->addr);
                }
#else
		
                node = esp_get_node_by_addr(sip->epub, wh->addr1);
#endif
                if(node != NULL)
                        sta_index = node->index;
                else
                        sta_index = ESP_PUB_MAX_STA + 1;
                SIP_HDR_SET_IFIDX(shdr->fc[0], evif->index << 3 | sta_index);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 37))
                shdr->d_p2p = itx_info->control.vif->p2p;
                if(evif->index == 1)
                        shdr->d_p2p = 1;
#endif
                shdr->d_ac = skb_get_queue_mapping(skb);
                shdr->d_tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
                wh = (struct ieee80211_hdr *)skb->data;
                if (ieee80211_is_mgmt(wh->frame_control)) {
		/* addba/delba/bar may use different tid/ac */
                        if (shdr->d_ac == WME_AC_VO) {
                                shdr->d_tid = 7;
                        }
                        if (ieee80211_is_beacon(wh->frame_control)) {
                                shdr->d_tid = 8;
                                shdr->d_ac = 4;
                        }
                }
                if (check_ac_tid(skb->data, shdr->d_ac, shdr->d_tid)) {
                        shdr->d_ac = WME_AC_BE;
                        shdr->d_tid = 0;
                }


                /* make sure data is start at 4 bytes aligned addr. */
                offset = roundup(sizeof(struct sip_hdr), 4);

#ifdef HOST_RC
                esp_sip_dbg(ESP_DBG_TRACE, "%s offset0 %d \n", __func__, offset);
                memcpy(sip->tx_aggr_write_ptr + offset, (void *)&itx_info->control,
                       sizeof(struct sip_tx_rc));

                offset += roundup(sizeof(struct sip_tx_rc), 4);
                esp_show_tx_rates(&itx_info->control.rates[0]);

#endif /* HOST_RC */

                if (SIP_HDR_IS_AMPDU(shdr)) {
                        memset(sip->tx_aggr_write_ptr + offset, 0, sizeof(struct esp_tx_ampdu_entry));
                        offset += roundup(sizeof(struct esp_tx_ampdu_entry), 4);
                }

                tx_len = offset + skb->len;
                shdr->len = tx_len;  /* actual len */

                esp_sip_dbg(ESP_DBG_TRACE, "%s offset %d skblen %d txlen %d\n", __func__, offset, skb->len, tx_len);

        }

        shdr->seq = sip->txseq++;
        //esp_sip_dbg(ESP_DBG_ERROR, "%s seq %u, %u %u\n", __func__, shdr->seq, SIP_HDR_GET_TYPE(shdr->fc[0]),shdr->c_cmdid);

        /* copy skb to aggr buf */
        memcpy(sip->tx_aggr_write_ptr + offset, skb->data, skb->len);

        if (is_data) {
			spin_lock_bh(&sip->epub->tx_lock);
			sip->txdataseq = shdr->seq;
			spin_unlock_bh(&sip->epub->tx_lock);
#ifndef FAST_TX_STATUS
                /* store seq in driver data, need seq to pick pkt during tx status report */
                *(u32 *)itx_info->driver_data = shdr->seq;
                atomic_inc(&sip->pending_tx_status);
#else
                /* fake a tx_status and report to mac80211 stack to speed up tx, may affect
                 *  1) rate control (now it's all in target, so should be OK)
                 *  2) ps mode, mac80211 want to check ACK of ps/nulldata to see if AP is awake
                 *  3) BAR, mac80211 do BAR by checking ACK
                 */
                /*
                 *  XXX: need to adjust for 11n, e.g. report tx_status according to BA received in target
                 *
                 */
                sip_tx_status_report(sip, skb, itx_info, true);
                atomic_dec(&sip->tx_data_pkt_queued);

#endif /* FAST_TX_STATUS */
                STRACE_TX_DATA_INC();
        } else {
                /* check pm state here */

               /* no need to hold ctrl skb */
                sip_free_ctrl_skbuff(sip, skb);
                STRACE_TX_CMD_INC();
        }

        /* TBD: roundup here or whole aggr-buf */
        tx_len = roundup(tx_len, sip->tx_blksz);

        sip->tx_aggr_write_ptr += tx_len;
        sip->tx_tot_len += tx_len;

        return 0;
}

#ifndef FAST_TX_STATUS
static void
sip_after_tx_status_update(struct esp_sip *sip)
{
        if (atomic_read(&sip->data_tx_stopped) == true && sip_tx_data_may_resume(sip)) {
                atomic_set(&sip->data_tx_stopped, false);
                if (sip_is_tx_mblk_avail(sip) == false) {
                        esp_sip_dbg(ESP_DBG_ERROR, "%s mblk still unavail \n", __func__);
                } else {
                        esp_sip_dbg(ESP_DBG_TRACE, "%s trigger txq \n", __func__);
                        sip_trigger_txq_process(sip);
                }
        } else if (!sip_tx_data_may_resume(sip)) { //JLU: this is redundant
                STRACE_SHOW(sip);
        }
}
#endif /* !FAST_TX_STATUS */

#ifdef HOST_RC
static void sip_set_tx_rate_status(struct sip_rc_status *rcstatus, struct ieee80211_tx_rate *irates)
{
        int i;
        u8 shift = 0;
        u32 cnt = 0;

        for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
                if (rcstatus->rc_map & BIT(i)) {
                        shift = i << 2;
                        cnt = (rcstatus->rc_cnt_store >> shift) & RC_CNT_MASK;
                        irates[i].idx = i;
                        irates[i].count = (u8)cnt;
                } else {
                        irates[i].idx = -1;
                        irates[i].count = 0;
                }
        }

        esp_show_rcstatus(rcstatus);
        esp_show_tx_rates(irates);
}
#endif /* HOST_RC */

#ifndef FAST_TX_STATUS
static void
sip_txdoneq_process(struct esp_sip *sip, struct sip_evt_tx_report *tx_report)
{
        struct sk_buff *skb, *tmp;
        struct esp_pub *epub = sip->epub;
        int matchs = 0;
        struct ieee80211_tx_info *tx_info;
        struct sip_tx_status *tx_status;
        int i;

        esp_sip_dbg(ESP_DBG_LOG, "%s enter, report->pkts %d, pending tx_status %d\n", __func__, tx_report->pkts, atomic_read(&sip->pending_tx_status));

        /* traversal the txdone queue, find out matched skb by seq, hand over
         * to up layer stack
         */
        for (i = 0; i < tx_report->pkts; i++) {
                //esp_sip_dbg(ESP_DBG_TRACE, "%s status %d seq %u\n", __func__, i, tx_report->status[i].sip_seq);
                skb_queue_walk_safe(&epub->txdoneq, skb, tmp) {
                        tx_info = IEEE80211_SKB_CB(skb);

                        //esp_sip_dbg(ESP_DBG_TRACE, "%s skb seq %u\n", __func__, *(u32 *)tx_info->driver_data);
                        if (tx_report->status[i].sip_seq == *(u32 *)tx_info->driver_data) {
                                tx_status = &tx_report->status[i];
                                __skb_unlink(skb, &epub->txdoneq);

                                //fill up ieee80211_tx_info
                                //TBD: lock ??
                                if (tx_status->errno == SIP_TX_ST_OK &&
                                    !(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
                                        tx_info->flags |= IEEE80211_TX_STAT_ACK;
                                }
#ifdef HOST_RC
                                sip_set_tx_rate_status(&tx_report->status[i].rcstatus, &tx_info->status.rates[0]);
                                esp_sip_dbg(ESP_DBG_TRACE, "%s idx0 %d, cnt0 %d, flags0 0x%02x\n", __func__, tx_info->status.rates[0].idx,tx_info->status.rates[0].count, tx_info->status.rates[0].flags);

#else
                                /* manipulate rate status... */
                                tx_info->status.rates[0].idx = 0;
                                tx_info->status.rates[0].count = 1;
                                tx_info->status.rates[0].flags = 0;
                                tx_info->status.rates[1].idx = -1;
#endif /* HOST_RC */

                                ieee80211_tx_status(epub->hw, skb);
                                matchs++;
                                atomic_dec(&sip->pending_tx_status);
                                STRACE_RX_TXSTATUS_INC();
                        }
                }
        }

        if (matchs < tx_report->pkts) {
                esp_sip_dbg(ESP_DBG_ERROR, "%s tx report mismatch! \n", __func__);
        } else {
                //esp_sip_dbg(ESP_DBG_TRACE, "%s tx report %d pkts! \n", __func__, matchs);
        }

        sip_after_tx_status_update(sip);
}
#else
#ifndef FAST_TX_NOWAIT

static void
sip_txdoneq_process(struct esp_sip *sip)
{
        struct esp_pub *epub = sip->epub;
        struct sk_buff *skb;
        while ((skb = skb_dequeue(&epub->txdoneq))) {
                ieee80211_tx_status(epub->hw, skb);
        }
}
#endif
#endif /* !FAST_TX_STATUS */

#ifdef FAST_TX_STATUS
static void sip_tx_status_report(struct esp_sip *sip, struct sk_buff *skb, struct ieee80211_tx_info *tx_info, bool success)
{
        if(!(tx_info->flags & IEEE80211_TX_CTL_AMPDU)) {
                if (likely(success))
                        tx_info->flags |= IEEE80211_TX_STAT_ACK;
                else
                        tx_info->flags &= ~IEEE80211_TX_STAT_ACK;

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29))
                /* manipulate rate status... */
                tx_info->status.rates[0].idx = 11;
                tx_info->status.rates[0].count = 1;
                tx_info->status.rates[0].flags = 0;
                tx_info->status.rates[1].idx = -1;
#else
                tx_info->status.retry_count = 1;
                tx_info->status.excessive_retries = false;
#endif

        } else {
                tx_info->flags |= IEEE80211_TX_STAT_AMPDU | IEEE80211_TX_STAT_ACK;
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39))
                tx_info->status.ampdu_ack_map = 1;
#else
                tx_info->status.ampdu_len = 1;
#endif
                tx_info->status.ampdu_ack_len = 1;

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29))
                /* manipulate rate status... */
                tx_info->status.rates[0].idx = 7;
                tx_info->status.rates[0].count = 1;
                tx_info->status.rates[0].flags = IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_SHORT_GI;
                tx_info->status.rates[1].idx = -1;
#else
                tx_info->status.retry_count = 1;
                tx_info->status.excessive_retries = false;
#endif

        }

        if(tx_info->flags & IEEE80211_TX_STAT_AMPDU)
                esp_sip_dbg(ESP_DBG_TRACE, "%s ampdu status! \n", __func__);

        if (!mod_support_no_txampdu() &&
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 10, 0))
                cfg80211_get_chandef_type(&sip->epub->hw->conf.chandef) != NL80211_CHAN_NO_HT
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29))
                sip->epub->hw->conf.channel_type != NL80211_CHAN_NO_HT
#else
                !(sip->epub->hw->conf.flags&IEEE80211_CONF_SUPPORT_HT_MODE)
#endif
                ) {
                struct ieee80211_tx_info * tx_info = IEEE80211_SKB_CB(skb);
                struct ieee80211_hdr * wh = (struct ieee80211_hdr *)skb->data;
                if(ieee80211_is_data_qos(wh->frame_control)) {
                        if(!(tx_info->flags & IEEE80211_TX_CTL_AMPDU)) {
                                u8 tidno = ieee80211_get_qos_ctl(wh)[0] & IEEE80211_QOS_CTL_TID_MASK;
                                struct esp_node * node;
                                struct esp_tx_tid *tid;
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 8, 0)) 
                                struct ieee80211_sta *sta;

				node = esp_get_node_by_addr(sip->epub, wh->addr1);
                                if(node == NULL)
                                        goto _exit;
                                if(node->sta == NULL)
                                        goto _exit;
				sta = node->sta;
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28))
                                struct ieee80211_sta *sta;
                                sta = tx_info->control.sta;
                                if(sta == NULL)
                                        goto _exit;
                                node = (struct esp_node *)sta->drv_priv;
				if(node == NULL){
                                	ESSERT(0);
					goto _exit;
				}
                                if(node->sta == NULL)
                                        goto _exit;
				if(!sta->ht_cap.ht_supported)
					goto _exit;
#else
                                node = esp_get_node_by_addr(sip->epub, wh->addr1);
                                if(node == NULL)
                                        goto _exit;
				if(!node->ht_info.ht_supported)
					goto _exit;
#endif
                                tid = &node->tid[tidno];
                                spin_lock_bh(&sip->epub->tx_ampdu_lock);
                                //start session
				if(tid == NULL){
                                        spin_unlock_bh(&sip->epub->tx_ampdu_lock);
                                	ESSERT(0);
					goto _exit;
				}
                                if ((tid->state == ESP_TID_STATE_INIT) && 
						(TID_TO_AC(tidno) != WME_AC_VO) && tid->cnt >= 10) {
                                        tid->state = ESP_TID_STATE_TRIGGER;
                                        esp_sip_dbg(ESP_DBG_ERROR, "start tx ba session,addr:%pM,tid:%u\n", wh->addr1, tidno);
                                        spin_unlock_bh(&sip->epub->tx_ampdu_lock);
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28))
                                        ieee80211_start_tx_ba_session(sip->epub->hw, wh->addr1, tidno);
#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 32))
                                        ieee80211_start_tx_ba_session(sip->epub->hw, sta->addr, tidno);
#elif (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 37))
                                        ieee80211_start_tx_ba_session(sta, tidno);
#else
                                        ieee80211_start_tx_ba_session(sta, tidno, 0);
#endif
                                } else {
					if(tid->state == ESP_TID_STATE_INIT)
						tid->cnt++;
					else
						tid->cnt = 0;
                                        spin_unlock_bh(&sip->epub->tx_ampdu_lock);
                                }
                        }
                }
        }
_exit:
#ifndef FAST_TX_NOWAIT 
        skb_queue_tail(&sip->epub->txdoneq, skb);
#else
        ieee80211_tx_status(sip->epub->hw, skb);
#endif
}
#endif /* FAST_TX_STATUS */

/*
 *  NB: this routine should be locked when calling
 */
void
sip_txq_process(struct esp_pub *epub)
{
        struct sk_buff *skb;
        struct esp_sip *sip = epub->sip;
        u32 pkt_len = 0, tx_len = 0;
	int blknum = 0;
        bool queued_back = false;
        bool out_of_credits = false;
        struct ieee80211_tx_info *itx_info;
        int pm_state = 0;
	
        while ((skb = skb_dequeue(&epub->txq))) {

                /* cmd skb->len does not include sip_hdr too */
                pkt_len = skb->len;
                itx_info = IEEE80211_SKB_CB(skb);
                if (itx_info->flags != 0xffffffff) {
                        pkt_len += roundup(sizeof(struct sip_hdr), 4);
                        if ((itx_info->flags & IEEE80211_TX_CTL_AMPDU) && (true || esp_is_ip_pkt(skb)))
                                pkt_len += roundup(sizeof(struct esp_tx_ampdu_entry), 4);
                }

                /* current design simply requires every sip_hdr must be at the begin of mblk, that definitely
                 * need to be optimized, e.g. calulate remain length in the previous mblk, if it larger than
                 * certain threshold (e.g, whole pkt or > 50% of pkt or 2 x sizeof(struct sip_hdr), append pkt
                 * to the previous mblk.  This might be done in sip_pack_pkt()
                 */
                pkt_len = roundup(pkt_len, sip->tx_blksz);
                blknum = pkt_len / sip->tx_blksz;
                esp_dbg(ESP_DBG_TRACE, "%s skb_len %d pkt_len %d blknum %d\n", __func__, skb->len, pkt_len, blknum);

	        if (unlikely(atomic_read(&sip->credit_status) == RECALC_CREDIT_ENABLE)) {      /* need recalc credit */
			struct sip_hdr *hdr = (struct sip_hdr*)skb->data;
			itx_info = IEEE80211_SKB_CB(skb);
        		if (!(itx_info->flags == 0xffffffff && SIP_HDR_GET_TYPE(hdr->fc[0]) == SIP_CTRL && hdr->c_cmdid == SIP_CMD_RECALC_CREDIT
					&& blknum <= atomic_read(&sip->tx_credits) - sip->credit_to_reserve)) {         /* except cmd recalc credit */
                        	esp_dbg(ESP_DBG_ERROR, "%s recalc credits!\n", __func__);
                        	STRACE_TX_OUT_OF_CREDIT_INC();
                        	queued_back = true;
                        	out_of_credits = true;
                        	break;
			}
                } else {                  /* normal situation */
                	if (unlikely(blknum > (atomic_read(&sip->tx_credits) - sip->credit_to_reserve - SIP_CTRL_CREDIT_RESERVE))) {
				itx_info = IEEE80211_SKB_CB(skb);
        			if (itx_info->flags == 0xffffffff) {         /* priv ctrl pkt */
					if (blknum > atomic_read(&sip->tx_credits) - sip->credit_to_reserve) {
		                        	esp_dbg(ESP_DBG_TRACE, "%s cmd pkt out of credits!\n", __func__);
               			        	STRACE_TX_OUT_OF_CREDIT_INC();
                        			queued_back = true;
                        			out_of_credits = true;
						break;
					}
				} else {
	                        	esp_dbg(ESP_DBG_TRACE, "%s out of credits!\n", __func__);
                                	STRACE_TX_OUT_OF_CREDIT_INC();
               		        	queued_back = true;
                        		out_of_credits = true;
					break;
				}
			}
		}
                tx_len += pkt_len;
                if (tx_len >= SIP_TX_AGGR_BUF_SIZE) {
                        /* do we need to have limitation likemax 8 pkts in a row? */
                        esp_dbg(ESP_DBG_TRACE, "%s too much pkts in one shot!\n", __func__);
                        STRACE_TX_ONE_SHOT_INC();
                        tx_len -= pkt_len;
                        queued_back = true;
                        break;
                }

                if (sip_pack_pkt(sip, skb, &pm_state) != 0) {
                        /* wrong pkt, won't send to target */
                        tx_len -= pkt_len;
                        continue;
                }

                esp_sip_dbg(ESP_DBG_TRACE, "%s:before sub, credits is %d\n", __func__, atomic_read(&sip->tx_credits));
                atomic_sub(blknum, &sip->tx_credits);
                esp_sip_dbg(ESP_DBG_TRACE, "%s:after sub %d,credits remains %d\n", __func__, blknum, atomic_read(&sip->tx_credits));

        }

        if (queued_back) {
                skb_queue_head(&epub->txq, skb);
        }

        if (atomic_read(&sip->state) == SIP_STOP 
#ifdef HOST_RESET_BUG
		|| atomic_read(&epub->wl.off) == 1
#endif
		)
	{
		queued_back = 1;
		tx_len = 0;
                sip_after_write_pkts(sip);
	}

        if (tx_len) {
	
		sip_write_pkts(sip, pm_state);

                sip_after_write_pkts(sip);
        }

        if (queued_back && !out_of_credits) {

                /* skb pending, do async process again */
                sip_trigger_txq_process(sip);
        }
}

static void sip_after_write_pkts(struct esp_sip *sip)
{

#ifndef FAST_TX_NOWAIT
        sip_txdoneq_process(sip);
#endif
        //disable tx_data
#ifndef FAST_TX_STATUS
        if (atomic_read(&sip->data_tx_stopped) == false && sip_tx_data_need_stop(sip)) {
                esp_sip_dbg(ESP_DBG_TRACE, "%s data_tx_stopped \n", __func__);
                atomic_set(&sip->data_tx_stopped, true);
        }
#endif /* FAST_TX_STATUS */
}

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35))
/*
 * old mac80211 (2.6.32.x) needs payload is 4 byte aligned, thus we need this hack.
 * TBD: However, the latest mac80211 stack does not need this. we may
 * need to check kernel version here...
 */
static void sip_check_skb_alignment(struct sk_buff *skb)
{
        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
        int hdrlen;

        hdrlen = ieee80211_hdrlen(hdr->frame_control);

        if (unlikely(((unsigned long)(skb->data + hdrlen)) & 3)) {

                esp_sip_dbg(ESP_DBG_TRACE, "%s adjust skb data postion \n", __func__);
                skb_push(skb, 2);
                memmove(skb->data, skb->data+2, skb->len-2);
                skb_trim(skb, skb->len-2);
        }
}
#endif /* !NEW_KERNEL */

#ifndef NO_WMM_DUMMY
static struct esp_80211_wmm_param_element esp_wmm_param = {
	.oui = {0x00, 0x50, 0xf2},
	.oui_type = 0x02,
	.oui_subtype = 0x01,
	.version = 0x01,
	.qos_info = 0x00,
	.reserved = 0x00,
	.ac = {
		{
			.aci_aifsn = 0x03,
			.cw = 0xa4,
			.txop_limit = 0x0000,
		},
		{
			.aci_aifsn = 0x27,
			.cw = 0xa4,
			.txop_limit = 0x0000,
		},
		{
			.aci_aifsn = 0x42,
			.cw = 0x43,
			.txop_limit = 0x005e,
		},
		{
			.aci_aifsn = 0x62,
			.cw = 0x32,
			.txop_limit = 0x002f,
		},
	},
};

static int esp_add_wmm(struct sk_buff *skb)
{
	u8 *p;
	int flag = 0;
	int remain_len;
	int base_len;
	int len;
	struct ieee80211_mgmt * mgmt;
	struct ieee80211_hdr * wh;

	if (!skb)
		return -1;

	wh = (struct ieee80211_hdr *)skb->data;
        mgmt = (struct ieee80211_mgmt *)((u8 *)skb->data);

	if (ieee80211_is_assoc_resp(wh->frame_control)) {
		p = mgmt->u.assoc_resp.variable;	
		base_len = (u8 *)mgmt->u.assoc_resp.variable - (u8 *)mgmt;
	} else if (ieee80211_is_reassoc_resp(wh->frame_control)) {
		p = mgmt->u.reassoc_resp.variable;	
		base_len = (u8 *)mgmt->u.reassoc_resp.variable - (u8 *)mgmt;
	} else if (ieee80211_is_probe_resp(wh->frame_control)) {
		p = mgmt->u.probe_resp.variable;	
		base_len = (u8 *)mgmt->u.probe_resp.variable - (u8 *)mgmt;
	} else if (ieee80211_is_beacon(wh->frame_control)) {
		p = mgmt->u.beacon.variable;	
		base_len = (u8 *)mgmt->u.beacon.variable - (u8 *)mgmt;
	} else 
		return 1;


	remain_len = skb->len - base_len;

	while (remain_len > 0) {
		if (*p == 0xdd && *(p+5) == 0x02)      //wmm type
			return 0;
		else if (*p == 0x2d)                   //has ht cap
			flag = 1;

		len = *(++p);
		p += (len + 1);
		remain_len -= (len + 2);
	}

	if(remain_len < 0) {
		esp_dbg(ESP_DBG_TRACE, "%s remain_len %d, skb->len %d, base_len %d, flag %d", __func__, remain_len, skb->len, base_len, flag);
		return -2;
	}

	if (flag == 1) {
		skb_put(skb, 2 + sizeof(esp_wmm_param));

		memset(p, 0xdd, sizeof(u8));
		memset(p + 1, sizeof(esp_wmm_param), sizeof(u8));
		memcpy(p + 2, &esp_wmm_param, sizeof(esp_wmm_param));

		esp_dbg(ESP_DBG_TRACE, "esp_wmm_param");
	}

	return 0;
}
#endif /* NO_WMM_DUMMY */

/*  parse mac_rx_ctrl and return length */
static int sip_parse_mac_rx_info(struct esp_sip *sip, struct esp_mac_rx_ctrl * mac_ctrl, struct sk_buff *skb)
{
        struct ieee80211_rx_status *rx_status = NULL;
	struct ieee80211_hdr *hdr;

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 32))
        rx_status = IEEE80211_SKB_RXCB(skb);
#else
        rx_status = (struct ieee80211_rx_status *)skb->cb;
#endif
        rx_status->freq = esp_ieee2mhz(mac_ctrl->channel);

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
        rx_status->signal = mac_ctrl->rssi + mac_ctrl->noise_floor;  /* snr actually, need to offset noise floor e.g. -85 */
#else
        rx_status->signal = mac_ctrl->rssi;  /* snr actually, need to offset noise floor e.g. -85 */
#endif /* NEW_KERNEL */

	hdr = (struct ieee80211_hdr *)skb->data;
	if (mac_ctrl->damatch0 == 1 && mac_ctrl->bssidmatch0 == 1        /*match bssid and da, but beacon package contain other bssid*/
			 && strncmp(hdr->addr2, sip->epub->wl.bssid, ETH_ALEN) == 0) { /* force match addr2 */
		if (++signal_loop >= SIGNAL_COUNT) {
			avg_signal += rx_status->signal;
			avg_signal /= SIGNAL_COUNT;
			old_signal = rx_status->signal = (avg_signal + 5);
			signal_loop = 0;
			avg_signal = 0;
		} else {
			avg_signal += rx_status->signal;
			rx_status->signal = old_signal;
		}
	}

#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35))
#define ESP_RSSI_MIN_RSSI (-90)
#define ESP_RSSI_MAX_RSSI (-45)
        rx_status->noise = 0;  /* TBD */
        rx_status->qual = (mac_ctrl->rssi - ESP_RSSI_MIN_RSSI)* 100/(ESP_RSSI_MAX_RSSI - ESP_RSSI_MIN_RSSI);
        rx_status->qual = min(rx_status->qual, 100);
        rx_status->qual = max(rx_status->qual, 0);
#undef ESP_RSSI_MAX_RSSI
#undef ESP_RSSI_MIN_RSSI
#endif /* !NEW_KERNEL && KERNEL_35*/
        rx_status->antenna = 0;  /* one antenna for now */
        rx_status->band = IEEE80211_BAND_2GHZ;
        rx_status->flag = RX_FLAG_DECRYPTED | RX_FLAG_MMIC_STRIPPED;
        if (mac_ctrl->sig_mode) {
            // 2.6.27 has RX_FLAG_RADIOTAP in enum mac80211_rx_flags in include/net/mac80211.h
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29))                
                rx_status->flag |= RX_FLAG_HT;
                rx_status->rate_idx = mac_ctrl->MCS;
                if(mac_ctrl->SGI)
                        rx_status->flag |= RX_FLAG_SHORT_GI;
#else
                rx_status->rate_idx = esp_wmac_rate2idx(0xc);//ESP_RATE_54
#endif
        } else {
                rx_status->rate_idx = esp_wmac_rate2idx(mac_ctrl->rate);
        }
        if (mac_ctrl->rxend_state == RX_FCS_ERR)
                rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;

        /* Mic error frame flag */
        if (mac_ctrl->rxend_state == RX_TKIPMIC_ERR || mac_ctrl->rxend_state == RX_CCMPMIC_ERR){
                if(atomic_read(&sip->epub->wl.tkip_key_set) == 1){
			rx_status->flag|= RX_FLAG_MMIC_ERROR;
			atomic_set(&sip->epub->wl.tkip_key_set, 0);
			printk("mic err\n");
		} else {
			printk("mic err discard\n");
		}
	}

        //esp_dbg(ESP_DBG_LOG, "%s freq: %u; signal: %d;  rate_idx %d; flag: %d \n", __func__, rx_status->freq, rx_status->signal, rx_status->rate_idx, rx_status->flag);

        do {
                struct ieee80211_hdr * wh = (struct ieee80211_hdr *)((u8 *)skb->data);

#ifndef NO_WMM_DUMMY
		if (ieee80211_is_mgmt(wh->frame_control))
			esp_add_wmm(skb);
#endif 

#ifdef KERNEL_IV_WAR
		/* some kernel e.g. 3.0.8 wrongly handles non-encrypted pkt like eapol */
		if (ieee80211_is_data(wh->frame_control)) {
                        if( !ieee80211_has_protected(wh->frame_control)) {
                                esp_sip_dbg(ESP_DBG_TRACE, "%s kiv_war, add iv_stripped flag \n", __func__);
                                rx_status->flag |= RX_FLAG_IV_STRIPPED;
                        } else {
                                if ((atomic_read(&sip->epub->wl.ptk_cnt) == 0 && !(wh->addr1[0] & 0x1)) || 
					(atomic_read(&sip->epub->wl.gtk_cnt) == 0 && (wh->addr1[0] & 0x1))) 
				{
                                        esp_dbg(ESP_DBG_TRACE, "%s ==kiv_war, got bogus enc pkt==\n", __func__);
                                        rx_status->flag |= RX_FLAG_IV_STRIPPED;
                                        //show_buf(skb->data, 32);
                                }

                                esp_sip_dbg(ESP_DBG_TRACE, "%s kiv_war, got enc pkt \n", __func__);
                        }
                }
#endif /* KERNEL_IV_WAR*/
        } while (0);

        return 0;
}

static struct esp_mac_rx_ctrl *sip_parse_normal_mac_ctrl(struct sk_buff *skb, int * pkt_len_enc, int *buf_len, int *pulled_len) 
{
        struct esp_mac_rx_ctrl *mac_ctrl = NULL;
        struct sip_hdr *hdr =(struct sip_hdr *)skb->data;
        int len_in_hdr = hdr->len;

        ESSERT(skb != NULL);
        ESSERT(skb->len > SIP_MIN_DATA_PKT_LEN);

        skb_pull(skb, sizeof(struct sip_hdr));
        *pulled_len += sizeof(struct sip_hdr);
        mac_ctrl = (struct esp_mac_rx_ctrl *)skb->data;
        if(!mac_ctrl->Aggregation) {
                ESSERT(pkt_len_enc != NULL);
                ESSERT(buf_len != NULL);
                *pkt_len_enc = (mac_ctrl->sig_mode?mac_ctrl->HT_length:mac_ctrl->legacy_length) - FCS_LEN;
                *buf_len = len_in_hdr - sizeof(struct sip_hdr) - sizeof(struct esp_mac_rx_ctrl);
        }
        skb_pull(skb, sizeof(struct esp_mac_rx_ctrl));
        *pulled_len += sizeof(struct esp_mac_rx_ctrl);

        return mac_ctrl;
}

/*
 * for one MPDU (including subframe in AMPDU)
 *
 */
static struct sk_buff * sip_parse_data_rx_info(struct esp_sip *sip, struct sk_buff *skb, int pkt_len_enc, int buf_len, struct esp_mac_rx_ctrl *mac_ctrl, int *pulled_len) {
        /*
         *   | mac_rx_ctrl | real_data_payload | ampdu_entries |
         */
        //without enc
        int pkt_len = 0;
        struct sk_buff *rskb = NULL;
        int ret;

        if (mac_ctrl->Aggregation) {
                struct ieee80211_hdr * wh = (struct ieee80211_hdr *)skb->data;
                pkt_len = pkt_len_enc;
                if (ieee80211_has_protected(wh->frame_control))//ampdu, it is CCMP enc
                        pkt_len -= 8;
                buf_len = roundup(pkt_len, 4);
        } else
                pkt_len  = buf_len - 3 + ((pkt_len_enc - 1) & 0x3);
        esp_dbg(ESP_DBG_TRACE, "%s pkt_len %u, pkt_len_enc %u!, delta %d \n", __func__, pkt_len, pkt_len_enc, pkt_len_enc - pkt_len);
        do {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39))
#ifndef NO_WMM_DUMMY
                rskb = __dev_alloc_skb(pkt_len_enc + 2 + sizeof(esp_wmm_param) + 2, GFP_ATOMIC);
#else
                rskb = __dev_alloc_skb(pkt_len_enc + 2, GFP_ATOMIC);
#endif /* NO_WMM_DUMMY */
#else
#ifndef NO_WMM_DUMMY
                rskb = __dev_alloc_skb(pkt_len_enc + sizeof(esp_wmm_param) + 2, GFP_ATOMIC);
#else
                rskb = __dev_alloc_skb(pkt_len_enc, GFP_ATOMIC);
#endif /* NO_WMM_DUMMY */
#endif/* NEW_KERNEL */
                if (unlikely(rskb == NULL)) {
                        esp_sip_dbg(ESP_DBG_ERROR, "%s no mem for rskb\n", __func__);
                        return NULL;
                }
                skb_put(rskb, pkt_len_enc);
        } while(0);

        do {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39))
                do {
                        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
                        int hdrlen;

                        hdrlen = ieee80211_hdrlen(hdr->frame_control);
                        if (unlikely(((unsigned long)(rskb->data + hdrlen)) & 3)) {
                                skb_put(rskb, 2);
                                skb_pull(rskb, 2);
                        }
                } while(0);
#endif /* < KERNEL_VERSION(2, 6, 39) */
                memcpy(rskb->data, skb->data, pkt_len);
                if (pkt_len_enc > pkt_len) {
                        memset(rskb->data + pkt_len, 0, pkt_len_enc - pkt_len);
                }
                /* strip out current pkt, move to the next one */
                skb_pull(skb, buf_len);
                *pulled_len += buf_len;
        } while (0);

        ret = sip_parse_mac_rx_info(sip, mac_ctrl, rskb);
        if(ret == -1 && !mac_ctrl->Aggregation) {
                kfree_skb(rskb);
                return NULL;
        }

        esp_dbg(ESP_DBG_LOG, "%s after pull headers, skb->len %d rskb->len %d \n", __func__, skb->len, rskb->len);

        return rskb;
}

struct esp_sip * sip_attach(struct esp_pub *epub) 
{
        struct esp_sip *sip = NULL;
        struct sip_pkt *pkt = NULL;
        int i;
#ifndef ESP_PREALLOC
        int po = 0;
#endif

        sip = kzalloc(sizeof(struct esp_sip), GFP_KERNEL);
	if (sip == NULL) {
                esp_dbg(ESP_DBG_ERROR, "no mem for sip! \n");
		goto _err_sip;
	}

#ifdef ESP_PREALLOC
	sip->tx_aggr_buf = (u8 *)esp_get_tx_aggr_buf();
#else
        po = get_order(SIP_TX_AGGR_BUF_SIZE);
        sip->tx_aggr_buf = (u8 *)__get_free_pages(GFP_ATOMIC, po);
#endif
        if (sip->tx_aggr_buf == NULL) {
                esp_dbg(ESP_DBG_ERROR, "no mem for tx_aggr_buf! \n");
		goto _err_aggr;
        }

        spin_lock_init(&sip->lock);

        INIT_LIST_HEAD(&sip->free_ctrl_txbuf);
        INIT_LIST_HEAD(&sip->free_ctrl_rxbuf);

        for (i = 0; i < SIP_CTRL_BUF_N; i++) {
                pkt = kzalloc(sizeof(struct sip_pkt), GFP_KERNEL);

                if (!pkt)
			goto _err_pkt;

                pkt->buf_begin = kzalloc(SIP_CTRL_BUF_SZ, GFP_KERNEL);

                if (pkt->buf_begin == NULL) {
			kfree(pkt);
			pkt = NULL;
			goto _err_pkt;
                }

                pkt->buf_len = SIP_CTRL_BUF_SZ;
                pkt->buf = pkt->buf_begin;

                if (i < SIP_CTRL_TXBUF_N) {
                        list_add_tail(&pkt->list, &sip->free_ctrl_txbuf);
                } else {
                        list_add_tail(&pkt->list, &sip->free_ctrl_rxbuf);
                }
        }

        mutex_init(&sip->rx_mtx);
        skb_queue_head_init(&sip->rxq);
        INIT_WORK(&sip->rx_process_work, sip_rxq_process);

        sip->epub = epub;
	atomic_set(&sip->noise_floor, -96);

        atomic_set(&sip->state, SIP_INIT);
	atomic_set(&sip->tx_credits, 0);

        if (sip->rawbuf == NULL) {
                sip->rawbuf = kzalloc(SIP_BOOT_BUF_SIZE, GFP_KERNEL);
                if (sip->rawbuf == NULL) {
                	esp_dbg(ESP_DBG_ERROR, "no mem for rawbuf! \n");
			goto _err_pkt;
        	}
	}

        atomic_set(&sip->state, SIP_PREPARE_BOOT);
     
        return sip;

_err_pkt:
	sip_free_init_ctrl_buf(sip);

	if (sip->tx_aggr_buf) {
#ifdef ESP_PREALLOC
		esp_put_tx_aggr_buf(&sip->tx_aggr_buf);
#else
                po = get_order(SIP_TX_AGGR_BUF_SIZE);
                free_pages((unsigned long)sip->tx_aggr_buf, po);
                sip->tx_aggr_buf = NULL;
#endif
	}
_err_aggr:
	if (sip) {
		kfree(sip);
		sip = NULL;
	}
_err_sip:
	return NULL;
	
}

static void sip_free_init_ctrl_buf(struct esp_sip *sip)
{
        struct sip_pkt *pkt, *tpkt;

        list_for_each_entry_safe(pkt, tpkt,
                                 &sip->free_ctrl_txbuf, list) {
                list_del(&pkt->list);
                kfree(pkt->buf_begin);
                kfree(pkt);
        }

        list_for_each_entry_safe(pkt, tpkt,
                                 &sip->free_ctrl_rxbuf, list) {
                list_del(&pkt->list);
                kfree(pkt->buf_begin);
                kfree(pkt);
        }
}

void sip_detach(struct esp_sip *sip)
{
#ifndef ESP_PREALLOC
        int po;
#endif
	if (sip == NULL)
		return ;

        sip_free_init_ctrl_buf(sip);

        if (atomic_read(&sip->state) == SIP_RUN) {

                sif_disable_target_interrupt(sip->epub);

                atomic_set(&sip->state, SIP_STOP);

                /* disable irq here */
                sif_disable_irq(sip->epub);
                cancel_work_sync(&sip->rx_process_work);

                skb_queue_purge(&sip->rxq);
		mutex_destroy(&sip->rx_mtx);
                cancel_work_sync(&sip->epub->sendup_work);
                skb_queue_purge(&sip->epub->rxq);

#ifdef ESP_NO_MAC80211
                unregister_netdev(sip->epub->net_dev);
                wiphy_unregister(sip->epub->wdev->wiphy);
#else
                if (test_and_clear_bit(ESP_WL_FLAG_HW_REGISTERED, &sip->epub->wl.flags)) {
                        ieee80211_unregister_hw(sip->epub->hw);
                }
#endif

                /* cancel all worker/timer */
                cancel_work_sync(&sip->epub->tx_work);
                skb_queue_purge(&sip->epub->txq);
                skb_queue_purge(&sip->epub->txdoneq);

#ifdef ESP_PREALLOC
		esp_put_tx_aggr_buf(&sip->tx_aggr_buf);
#else
                po = get_order(SIP_TX_AGGR_BUF_SIZE);
                free_pages((unsigned long)sip->tx_aggr_buf, po);
                sip->tx_aggr_buf = NULL;
#endif

                atomic_set(&sip->state, SIP_INIT);
        } else if (atomic_read(&sip->state) >= SIP_BOOT && atomic_read(&sip->state) <= SIP_WAIT_BOOTUP) {

                sif_disable_target_interrupt(sip->epub);
                atomic_set(&sip->state, SIP_STOP);
                sif_disable_irq(sip->epub);

                if (sip->rawbuf)
                        kfree(sip->rawbuf);

                if (atomic_read(&sip->state) == SIP_SEND_INIT) {
                        cancel_work_sync(&sip->rx_process_work);
                        skb_queue_purge(&sip->rxq);
			mutex_destroy(&sip->rx_mtx);
                        cancel_work_sync(&sip->epub->sendup_work);
                        skb_queue_purge(&sip->epub->rxq);
                }

#ifdef ESP_NO_MAC80211
                unregister_netdev(sip->epub->net_dev);
                wiphy_unregister(sip->epub->wdev->wiphy);
#else
                if (test_and_clear_bit(ESP_WL_FLAG_HW_REGISTERED, &sip->epub->wl.flags)) {
                        ieee80211_unregister_hw(sip->epub->hw);
                }
#endif
                        atomic_set(&sip->state, SIP_INIT);
        } else
                esp_dbg(ESP_DBG_ERROR, "%s wrong state %d\n", __func__, atomic_read(&sip->state));

        kfree(sip);
}

int sip_write_memory(struct esp_sip *sip, u32 addr, u8 *buf, u16 len)
{
        struct sip_cmd_write_memory *cmd;
        struct sip_hdr *chdr;
        u16 remains, hdrs, bufsize;
        u32 loadaddr;
        u8 *src;
        int err = 0;
	u32 *t = NULL;

	if (sip == NULL || sip->rawbuf == NULL) {
        	ESSERT(sip != NULL);
        	ESSERT(sip->rawbuf != NULL);
		return -EINVAL;
	}

        memset(sip->rawbuf, 0, SIP_BOOT_BUF_SIZE);

        chdr = (struct sip_hdr *)sip->rawbuf;
        SIP_HDR_SET_TYPE(chdr->fc[0], SIP_CTRL);
        chdr->c_cmdid = SIP_CMD_WRITE_MEMORY;

        remains = len;
        hdrs = sizeof(struct sip_hdr) + sizeof(struct sip_cmd_write_memory);

        while (remains) {
                src = &buf[len - remains];
                loadaddr = addr + (len - remains);

                if (remains < (SIP_BOOT_BUF_SIZE - hdrs)) {
                        /* aligned with 4 bytes */
                        bufsize = roundup(remains, 4);
                        memset(sip->rawbuf + hdrs, 0, bufsize);
                        remains = 0;
                } else {
                        bufsize = SIP_BOOT_BUF_SIZE - hdrs;
                        remains -=  bufsize;
                }

                chdr->len = bufsize + hdrs;
                chdr->seq = sip->txseq++;
                cmd = (struct sip_cmd_write_memory *)(sip->rawbuf + SIP_CTRL_HDR_LEN);
                cmd->len = bufsize;
                cmd->addr = loadaddr;
                memcpy(sip->rawbuf+hdrs, src, bufsize);

                t = (u32 *)sip->rawbuf;
                esp_dbg(ESP_DBG_TRACE, "%s t0: 0x%08x t1: 0x%08x t2:0x%08x loadaddr 0x%08x \n", __func__, t[0], t[1], t[2], loadaddr);

				err = esp_common_write(sip->epub, sip->rawbuf, chdr->len, ESP_SIF_SYNC);

                if (err) {
                        esp_dbg(ESP_DBG_ERROR, "%s send buffer failed\n", __func__);
                        return err;
                }

                // 1ms is enough, in fact on dell-d430, need not delay at all.
                mdelay(1);

        }

        return err;
}

int sip_send_cmd(struct esp_sip *sip, int cid, u32 cmdlen, void *cmd)
{
        struct sip_hdr *chdr;
        struct sip_pkt *pkt = NULL;
        int ret = 0;

        pkt = sip_get_ctrl_buf(sip, SIP_TX_CTRL_BUF);

        if (pkt == NULL)
                return -ENOMEM;

        chdr = (struct sip_hdr *)pkt->buf_begin;
        chdr->len = SIP_CTRL_HDR_LEN + cmdlen;
        chdr->seq = sip->txseq++;
        chdr->c_cmdid = cid;
	

	if (cmd) {
		memset(pkt->buf, 0, cmdlen);
		memcpy(pkt->buf, (u8 *)cmd, cmdlen);
	}

        esp_dbg(ESP_DBG_TRACE, "cid %d, len %u, seq %u \n", chdr->c_cmdid, chdr->len, chdr->seq);

        esp_dbg(ESP_DBG_TRACE, "c1 0x%08x   c2 0x%08x\n", *(u32 *)&pkt->buf[0], *(u32 *)&pkt->buf[4]);

		ret = esp_common_write(sip->epub, pkt->buf_begin, chdr->len, ESP_SIF_SYNC);

        if (ret)
                esp_dbg(ESP_DBG_ERROR, "%s send cmd %d failed \n", __func__, cid);

        sip_reclaim_ctrl_buf(sip, pkt, SIP_TX_CTRL_BUF);

        /*
         *  Hack here: reset tx/rx seq before target ram code is up...
         */
        if (cid == SIP_CMD_BOOTUP) {
                sip->rxseq = 0;
                sip->txseq = 0;
		sip->txdataseq = 0;
        }

        return ret;
}

struct sk_buff *
sip_alloc_ctrl_skbuf(struct esp_sip *sip, u16 len, u32 cid) {
        struct sip_hdr *si = NULL;
        struct ieee80211_tx_info *ti = NULL;
        struct sk_buff *skb = NULL;

        ESSERT(len <= sip->tx_blksz);

        /* no need to reserve space for net stack */
        skb = __dev_alloc_skb(len, GFP_KERNEL);

        if (skb == NULL) {
                esp_dbg(ESP_DBG_ERROR, "no skb for ctrl !\n");
                return NULL;
        }

        skb->len = len;

        ti = IEEE80211_SKB_CB(skb);
        /* set tx_info flags to 0xffffffff to indicate sip_ctrl pkt */
        ti->flags = 0xffffffff;
        si = (struct sip_hdr *)skb->data;
        memset(si, 0, sizeof(struct sip_hdr));
        SIP_HDR_SET_TYPE(si->fc[0], SIP_CTRL);
        si->len = len;
        si->c_cmdid = cid;

        return skb;
}

void
sip_free_ctrl_skbuff(struct esp_sip *sip, struct sk_buff *skb)
{
        memset(IEEE80211_SKB_CB(skb), 0, sizeof(struct ieee80211_tx_info));
        kfree_skb(skb);
}

static struct sip_pkt *
sip_get_ctrl_buf(struct esp_sip *sip, SIP_BUF_TYPE bftype) {
        struct sip_pkt *pkt = NULL;
        struct list_head *bflist;
        struct sip_hdr *chdr;

        bflist = (bftype == SIP_TX_CTRL_BUF) ? &sip->free_ctrl_txbuf :&sip->free_ctrl_rxbuf;

        spin_lock_bh(&sip->lock);

        if (list_empty(bflist)) {
                spin_unlock_bh(&sip->lock);
                return NULL;
        }

        pkt = list_first_entry(bflist, struct sip_pkt, list);
        list_del(&pkt->list);
        spin_unlock_bh(&sip->lock);

        if (bftype == SIP_TX_CTRL_BUF) {
                chdr = (struct sip_hdr *)pkt->buf_begin;
                SIP_HDR_SET_TYPE(chdr->fc[0], SIP_CTRL);
                pkt->buf = pkt->buf_begin + SIP_CTRL_HDR_LEN;
        } else {
                pkt->buf = pkt->buf_begin;
        }

        return pkt;
}

static void
sip_reclaim_ctrl_buf(struct esp_sip *sip, struct sip_pkt *pkt, SIP_BUF_TYPE bftype)
{
        struct list_head *bflist = NULL;

        if (bftype == SIP_TX_CTRL_BUF)
                bflist = &sip->free_ctrl_txbuf;
        else if (bftype == SIP_RX_CTRL_BUF)
                bflist = &sip->free_ctrl_rxbuf;
        else return;

        pkt->buf = pkt->buf_begin;

        spin_lock_bh(&sip->lock);
        list_add_tail(&pkt->list, bflist);
        spin_unlock_bh(&sip->lock);
}

int
sip_poll_bootup_event(struct esp_sip *sip)
{
	int ret = 0;

        esp_dbg(ESP_DBG_TRACE, "polling bootup event... \n");

	if (gl_bootup_cplx)
		ret = wait_for_completion_timeout(gl_bootup_cplx, 2 * HZ);

	esp_dbg(ESP_DBG_TRACE, "******time remain****** = [%d]\n", ret);
	if (ret <= 0) {
		esp_dbg(ESP_DBG_ERROR, "bootup event timeout\n");
		return -ETIMEDOUT;
	}	

	if(sif_get_ate_config() == 0){
		ret = esp_register_mac80211(sip->epub);
	}

#ifdef TEST_MODE
        ret = test_init_netlink(sip);
        if (ret < 0) {
                esp_sip_dbg(ESP_DBG_TRACE, "esp_sdio: failed initializing netlink\n");
		return ret;
	}
#endif
        
	atomic_set(&sip->state, SIP_RUN);
        esp_dbg(ESP_DBG_TRACE, "target booted up\n");

	return ret;
}

int
sip_poll_resetting_event(struct esp_sip *sip)
{
	int ret = 0;

        esp_dbg(ESP_DBG_TRACE, "polling resetting event... \n");

	if (gl_bootup_cplx)
		ret = wait_for_completion_timeout(gl_bootup_cplx, 10 * HZ);

	esp_dbg(ESP_DBG_TRACE, "******time remain****** = [%d]\n", ret);
	if (ret <= 0) {
		esp_dbg(ESP_DBG_ERROR, "resetting event timeout\n");
		return -ETIMEDOUT;
	}	
      
        esp_dbg(ESP_DBG_TRACE, "target resetting %d %p\n", ret, gl_bootup_cplx);

	return 0;
}


#ifdef FPGA_DEBUG

/* bogus bootup cmd for FPGA debugging */
int
sip_send_bootup(struct esp_sip *sip)
{
        int ret;
        struct sip_cmd_bootup bootcmd;

        esp_dbg(ESP_DBG_LOG, "sending bootup\n");

        bootcmd.boot_addr = 0;
        ret = sip_send_cmd(sip, SIP_CMD_BOOTUP, sizeof(struct sip_cmd_bootup), &bootcmd);

        return ret;
}

#endif /* FPGA_DEBUG */

bool
sip_queue_need_stop(struct esp_sip *sip)
{
        return atomic_read(&sip->tx_data_pkt_queued) >= SIP_STOP_QUEUE_THRESHOLD
		|| (atomic_read(&sip->tx_credits) < 8
		&& atomic_read(&sip->tx_data_pkt_queued) >= SIP_STOP_QUEUE_THRESHOLD / 4 * 3);
}

bool
sip_queue_may_resume(struct esp_sip *sip)
{
	return atomic_read(&sip->epub->txq_stopped)
		&& !test_bit(ESP_WL_FLAG_STOP_TXQ, &sip->epub->wl.flags)
		&& ((atomic_read(&sip->tx_credits) >= 16
		&& atomic_read(&sip->tx_data_pkt_queued) < SIP_RESUME_QUEUE_THRESHOLD * 2)
		|| atomic_read(&sip->tx_data_pkt_queued) < SIP_RESUME_QUEUE_THRESHOLD);
}

#ifndef FAST_TX_STATUS
bool
sip_tx_data_need_stop(struct esp_sip *sip)
{
        return atomic_read(&sip->pending_tx_status) >= SIP_PENDING_STOP_TX_THRESHOLD;
}

bool
sip_tx_data_may_resume(struct esp_sip *sip)
{
        return atomic_read(&sip->pending_tx_status) < SIP_PENDING_RESUME_TX_THRESHOLD;
}
#endif /* FAST_TX_STATUS */

int
sip_cmd_enqueue(struct esp_sip *sip, struct sk_buff *skb, int prior)
{
	if (!sip || !sip->epub) {
		esp_dbg(ESP_DBG_ERROR, "func %s, sip->epub->txq is NULL\n", __func__);
		return -EINVAL;
	}
	
	if (!skb) {
		esp_dbg(ESP_DBG_ERROR, "func %s, skb is NULL\n", __func__);
		return -EINVAL;
	}

	if (prior == ENQUEUE_PRIOR_HEAD)
        	skb_queue_head(&sip->epub->txq, skb);
	else
        	skb_queue_tail(&sip->epub->txq, skb);

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 32)
        if(sif_get_ate_config() == 0){
            ieee80211_queue_work(sip->epub->hw, &sip->epub->tx_work);
        } else {
            queue_work(sip->epub->esp_wkq, &sip->epub->tx_work);
        } 
#else       
        queue_work(sip->epub->esp_wkq, &sip->epub->tx_work);
#endif
        return 0;
}

void sip_tx_data_pkt_enqueue(struct esp_pub *epub, struct sk_buff *skb)
{
	if(!epub || !epub->sip) {
		if (!epub)
			esp_dbg(ESP_DBG_ERROR, "func %s, epub is NULL\n", __func__);
		else
			esp_dbg(ESP_DBG_ERROR, "func %s, epub->sip is NULL\n", __func__);

		return;
	}
	if (!skb) {
                esp_dbg(ESP_DBG_ERROR, "func %s, skb is NULL\n", __func__);
                return;
        }
        skb_queue_tail(&epub->txq, skb);
        atomic_inc(&epub->sip->tx_data_pkt_queued);
	if(sip_queue_need_stop(epub->sip)){
		if (epub->hw) {
			ieee80211_stop_queues(epub->hw);
			atomic_set(&epub->txq_stopped, true);
		}

	}
}

#ifdef FPGA_TXDATA
int sip_send_tx_data(struct esp_sip *sip)
{
        struct sk_buff *skb = NULL;
        struct sip_cmd_bss_info_update*bsscmd;

        skb = sip_alloc_ctrl_skbuf(epub->sip, sizeof(struct sip_cmd_bss_info_update), SIP_CMD_BSS_INFO_UPDATE);
        if (!skb)
                return -EINVAL;

        bsscmd = (struct sip_cmd_bss_info_update *)(skb->data + sizeof(struct sip_tx_info));
        bsscmd->isassoc= (assoc==true)? 1: 0;
        memcpy(bsscmd->bssid, bssid, ETH_ALEN);
        STRACE_SHOW(epub->sip);
        return sip_cmd_enqueue(epub->sip, skb, ENQUEUE_PRIOR_TAIL);
}
#endif /* FPGA_TXDATA */