bool
dhd_tcpdata_info_get(dhd_pub_t *dhdp, void *pkt)
{
	uint8 *ether_hdr;	/* Ethernet header of the new packet */
	uint16 ether_type;	/* Ethernet type of the new packet */
	uint8 *ip_hdr;		/* IP header of the new packet */
	uint8 *tcp_hdr;		/* TCP header of the new packet */
	uint32 ip_hdr_len;	/* IP header length of the new packet */
	uint32 cur_framelen;
	uint16 ip_total_len;	/* Total length of IP packet for the new packet */
	uint32 tcp_hdr_len;		/* TCP header length of the new packet */
	uint32 tcp_seq_num;		/* TCP sequence number of the new packet */
	uint16 tcp_data_len;	/* TCP DATA length that excludes IP and TCP headers */
	uint32 end_tcp_seq_num;	/* TCP seq number of the last byte in the new packet */
	tcpack_sup_module_t *tcpack_sup_mod;
	tcpdata_info_t *tcpdata_info = NULL;
	tdata_psh_info_t *tdata_psh_info;

	int i;
	bool ret = FALSE;

	if (dhdp->tcpack_sup_mode != TCPACK_SUP_DELAYTX)
		goto exit;

	ether_hdr = PKTDATA(dhdp->osh, pkt);
	cur_framelen = PKTLEN(dhdp->osh, pkt);

	ether_type = ether_hdr[12] << 8 | ether_hdr[13];

	if (ether_type != ETHER_TYPE_IP) {
		DHD_TRACE(("%s %d: Not a IP packet 0x%x\n",
			__FUNCTION__, __LINE__, ether_type));
		goto exit;
	}

	DHD_TRACE(("%s %d: IP pkt! 0x%x\n", __FUNCTION__, __LINE__, ether_type));

	ip_hdr = ether_hdr + ETHER_HDR_LEN;
	cur_framelen -= ETHER_HDR_LEN;

	ASSERT(cur_framelen >= IPV4_MIN_HEADER_LEN);

	ip_hdr_len = IPV4_HLEN(ip_hdr);
	if (IP_VER(ip_hdr) != IP_VER_4 || IPV4_PROT(ip_hdr) != IP_PROT_TCP) {
		DHD_TRACE(("%s %d: Not IPv4 nor TCP! ip ver %d, prot %d\n",
			__FUNCTION__, __LINE__, IP_VER(ip_hdr), IPV4_PROT(ip_hdr)));
		goto exit;
	}

	tcp_hdr = ip_hdr + ip_hdr_len;
	cur_framelen -= ip_hdr_len;

	ASSERT(cur_framelen >= TCP_MIN_HEADER_LEN);

	DHD_TRACE(("%s %d: TCP pkt!\n", __FUNCTION__, __LINE__));

	ip_total_len = ntoh16_ua(&ip_hdr[IPV4_PKTLEN_OFFSET]);
	tcp_hdr_len = 4 * TCP_HDRLEN(tcp_hdr[TCP_HLEN_OFFSET]);

	/* This packet is mere TCP ACK, so do nothing */
	if (ip_total_len == ip_hdr_len + tcp_hdr_len) {
		DHD_TRACE(("%s %d: Do nothing for no data TCP ACK\n", __FUNCTION__, __LINE__));
		goto exit;
	}

	ASSERT(ip_total_len > ip_hdr_len + tcp_hdr_len);

	if ((tcp_hdr[TCP_FLAGS_OFFSET] & TCP_FLAG_PSH) == 0) {
		DHD_TRACE(("%s %d: Not interested TCP DATA packet\n", __FUNCTION__, __LINE__));
		goto exit;
	}

	DHD_TRACE(("%s %d: TCP DATA with nonzero DATA length"
		" IP addr "IPV4_ADDR_STR" "IPV4_ADDR_STR" TCP port %d %d, flag 0x%x\n",
		__FUNCTION__, __LINE__,
		IPV4_ADDR_TO_STR(ntoh32_ua(&ip_hdr[IPV4_SRC_IP_OFFSET])),
		IPV4_ADDR_TO_STR(ntoh32_ua(&ip_hdr[IPV4_DEST_IP_OFFSET])),
		ntoh16_ua(&tcp_hdr[TCP_SRC_PORT_OFFSET]),
		ntoh16_ua(&tcp_hdr[TCP_DEST_PORT_OFFSET]),
		tcp_hdr[TCP_FLAGS_OFFSET]));

	dhd_os_tcpacklock(dhdp);
	tcpack_sup_mod = dhdp->tcpack_sup_module;

	if (!tcpack_sup_mod) {
		DHD_ERROR(("%s %d: tcpack suppress module NULL!!\n", __FUNCTION__, __LINE__));
		ret = BCME_ERROR;
		dhd_os_tcpackunlock(dhdp);
		goto exit;
	}

	/* Look for tcpdata_info that has the same ip src/dst addrs and tcp src/dst ports */
	i = 0;
	while (i < tcpack_sup_mod->tcpdata_info_cnt) {
		tcpdata_info_t *tdata_info_tmp = &tcpack_sup_mod->tcpdata_info_tbl[i];
		uint32 now_in_ms = OSL_SYSUPTIME();
		DHD_TRACE(("%s %d: data info[%d], IP addr "IPV4_ADDR_STR" "IPV4_ADDR_STR
			" TCP port %d %d\n", __FUNCTION__, __LINE__, i,
			IPV4_ADDR_TO_STR(ntoh32_ua(tdata_info_tmp->src_ip_addr)),
			IPV4_ADDR_TO_STR(ntoh32_ua(tdata_info_tmp->dst_ip_addr)),
			ntoh16_ua(tdata_info_tmp->src_tcp_port),
			ntoh16_ua(tdata_info_tmp->dst_tcp_port)));

		/* If both IP address and TCP port number match, we found it so break. */
		if (memcmp(&ip_hdr[IPV4_SRC_IP_OFFSET],
			tdata_info_tmp->src_ip_addr, IPV4_ADDR_LEN * 2) == 0 &&
			memcmp(&tcp_hdr[TCP_SRC_PORT_OFFSET],
			tdata_info_tmp->src_tcp_port, TCP_PORT_LEN * 2) == 0) {
			tcpdata_info = tdata_info_tmp;
			tcpdata_info->last_used_time = now_in_ms;
			break;
		}

		if (now_in_ms - tdata_info_tmp->last_used_time > TCPDATA_INFO_TIMEOUT) {
			tdata_psh_info_t *tdata_psh_info_tmp;
			tcpdata_info_t *last_tdata_info;

			while ((tdata_psh_info_tmp = tdata_info_tmp->tdata_psh_info_head)) {
				tdata_info_tmp->tdata_psh_info_head = tdata_psh_info_tmp->next;
				tdata_psh_info_tmp->next = NULL;
				DHD_TRACE(("%s %d: Clean tdata_psh_info(end_seq %u)!\n",
					__FUNCTION__, __LINE__, tdata_psh_info_tmp->end_seq));
				_tdata_psh_info_pool_enq(tcpack_sup_mod, tdata_psh_info_tmp);
			}
#ifdef DHDTCPACK_SUP_DBG
			DHD_ERROR(("%s %d: PSH INFO ENQ %d\n",
				__FUNCTION__, __LINE__, tcpack_sup_mod->psh_info_enq_num));
#endif /* DHDTCPACK_SUP_DBG */
			tcpack_sup_mod->tcpdata_info_cnt--;
			ASSERT(tcpack_sup_mod->tcpdata_info_cnt >= 0);

			last_tdata_info =
				&tcpack_sup_mod->tcpdata_info_tbl[tcpack_sup_mod->tcpdata_info_cnt];
			if (i < tcpack_sup_mod->tcpdata_info_cnt) {
				ASSERT(last_tdata_info != tdata_info_tmp);
				bcopy(last_tdata_info, tdata_info_tmp, sizeof(tcpdata_info_t));
			}
			bzero(last_tdata_info, sizeof(tcpdata_info_t));
			DHD_TRACE(("%s %d: tcpdata_info(idx %d) is aged out. ttl cnt is now %d\n",
				__FUNCTION__, __LINE__, i, tcpack_sup_mod->tcpdata_info_cnt));
			/* Don't increase "i" here, so that the prev last tcpdata_info is checked */
		} else
			 i++;
	}

	tcp_seq_num = ntoh32_ua(&tcp_hdr[TCP_SEQ_NUM_OFFSET]);
	tcp_data_len = ip_total_len - ip_hdr_len - tcp_hdr_len;
	end_tcp_seq_num = tcp_seq_num + tcp_data_len;

	if (tcpdata_info == NULL) {
		ASSERT(i == tcpack_sup_mod->tcpdata_info_cnt);
		if (i >= TCPDATA_INFO_MAXNUM) {
			DHD_TRACE(("%s %d: tcp_data_info_tbl FULL! %d %d"
				" IP addr "IPV4_ADDR_STR" "IPV4_ADDR_STR" TCP port %d %d\n",
				__FUNCTION__, __LINE__, i, tcpack_sup_mod->tcpdata_info_cnt,
				IPV4_ADDR_TO_STR(ntoh32_ua(&ip_hdr[IPV4_SRC_IP_OFFSET])),
				IPV4_ADDR_TO_STR(ntoh32_ua(&ip_hdr[IPV4_DEST_IP_OFFSET])),
				ntoh16_ua(&tcp_hdr[TCP_SRC_PORT_OFFSET]),
				ntoh16_ua(&tcp_hdr[TCP_DEST_PORT_OFFSET])));
			dhd_os_tcpackunlock(dhdp);
			goto exit;
		}
		tcpdata_info = &tcpack_sup_mod->tcpdata_info_tbl[i];

		/* No TCP flow with the same IP addr and TCP port is found
		 * in tcp_data_info_tbl. So add this flow to the table.
		 */
		DHD_TRACE(("%s %d: Add data info to tbl[%d]: IP addr "IPV4_ADDR_STR" "IPV4_ADDR_STR
			" TCP port %d %d\n",
			__FUNCTION__, __LINE__, tcpack_sup_mod->tcpdata_info_cnt,
			IPV4_ADDR_TO_STR(ntoh32_ua(&ip_hdr[IPV4_SRC_IP_OFFSET])),
			IPV4_ADDR_TO_STR(ntoh32_ua(&ip_hdr[IPV4_DEST_IP_OFFSET])),
			ntoh16_ua(&tcp_hdr[TCP_SRC_PORT_OFFSET]),
			ntoh16_ua(&tcp_hdr[TCP_DEST_PORT_OFFSET])));

		bcopy(&ip_hdr[IPV4_SRC_IP_OFFSET], tcpdata_info->src_ip_addr,
			IPV4_ADDR_LEN * 2);
		bcopy(&tcp_hdr[TCP_SRC_PORT_OFFSET], tcpdata_info->src_tcp_port,
			TCP_PORT_LEN * 2);

		tcpdata_info->last_used_time = OSL_SYSUPTIME();
		tcpack_sup_mod->tcpdata_info_cnt++;
	}

	ASSERT(tcpdata_info != NULL);

	tdata_psh_info = _tdata_psh_info_pool_deq(tcpack_sup_mod);
#ifdef DHDTCPACK_SUP_DBG
	DHD_TRACE(("%s %d: PSH INFO ENQ %d\n",
		__FUNCTION__, __LINE__, tcpack_sup_mod->psh_info_enq_num));
#endif /* DHDTCPACK_SUP_DBG */

	if (tdata_psh_info == NULL) {
		DHD_ERROR(("%s %d: No more free tdata_psh_info!!\n", __FUNCTION__, __LINE__));
		ret = BCME_ERROR;
		dhd_os_tcpackunlock(dhdp);
		goto exit;
	}
	tdata_psh_info->end_seq = end_tcp_seq_num;

#if defined(DEBUG_COUNTER) && defined(DHDTCPACK_SUP_DBG)
	tack_tbl.cnt[4]++;
#endif /* DEBUG_COUNTER && DHDTCPACK_SUP_DBG */

	DHD_TRACE(("%s %d: TCP PSH DATA recvd! end seq %u\n",
		__FUNCTION__, __LINE__, tdata_psh_info->end_seq));

	ASSERT(tdata_psh_info->next == NULL);

	if (tcpdata_info->tdata_psh_info_head == NULL)
		tcpdata_info->tdata_psh_info_head = tdata_psh_info;
	else {
		ASSERT(tcpdata_info->tdata_psh_info_tail);
		tcpdata_info->tdata_psh_info_tail->next = tdata_psh_info;
	}
	tcpdata_info->tdata_psh_info_tail = tdata_psh_info;

	dhd_os_tcpackunlock(dhdp);

exit:
	return ret;
}
bool
dhd_tcpack_hold(dhd_pub_t *dhdp, void *pkt, int ifidx)
{
	uint8 *new_ether_hdr;	/* Ethernet header of the new packet */
	uint16 new_ether_type;	/* Ethernet type of the new packet */
	uint8 *new_ip_hdr;		/* IP header of the new packet */
	uint8 *new_tcp_hdr;		/* TCP header of the new packet */
	uint32 new_ip_hdr_len;	/* IP header length of the new packet */
	uint32 cur_framelen;
	uint32 new_tcp_ack_num;		/* TCP acknowledge number of the new packet */
	uint16 new_ip_total_len;	/* Total length of IP packet for the new packet */
	uint32 new_tcp_hdr_len;		/* TCP header length of the new packet */
	tcpack_sup_module_t *tcpack_sup_mod;
	tcpack_info_t *tcpack_info_tbl;
	int i, free_slot = TCPACK_INFO_MAXNUM;
	bool hold = FALSE;
	unsigned long flags;

	if (dhdp->tcpack_sup_mode != TCPACK_SUP_HOLD) {
		goto exit;
	}

	if (dhdp->tcpack_sup_ratio == 1) {
		goto exit;
	}

	new_ether_hdr = PKTDATA(dhdp->osh, pkt);
	cur_framelen = PKTLEN(dhdp->osh, pkt);

	if (cur_framelen < TCPACKSZMIN || cur_framelen > TCPACKSZMAX) {
		DHD_TRACE(("%s %d: Too short or long length %d to be TCP ACK\n",
			__FUNCTION__, __LINE__, cur_framelen));
		goto exit;
	}

	new_ether_type = new_ether_hdr[12] << 8 | new_ether_hdr[13];

	if (new_ether_type != ETHER_TYPE_IP) {
		DHD_TRACE(("%s %d: Not a IP packet 0x%x\n",
			__FUNCTION__, __LINE__, new_ether_type));
		goto exit;
	}

	DHD_TRACE(("%s %d: IP pkt! 0x%x\n", __FUNCTION__, __LINE__, new_ether_type));

	new_ip_hdr = new_ether_hdr + ETHER_HDR_LEN;
	cur_framelen -= ETHER_HDR_LEN;

	ASSERT(cur_framelen >= IPV4_MIN_HEADER_LEN);

	new_ip_hdr_len = IPV4_HLEN(new_ip_hdr);
	if (IP_VER(new_ip_hdr) != IP_VER_4 || IPV4_PROT(new_ip_hdr) != IP_PROT_TCP) {
		DHD_TRACE(("%s %d: Not IPv4 nor TCP! ip ver %d, prot %d\n",
			__FUNCTION__, __LINE__, IP_VER(new_ip_hdr), IPV4_PROT(new_ip_hdr)));
		goto exit;
	}

	new_tcp_hdr = new_ip_hdr + new_ip_hdr_len;
	cur_framelen -= new_ip_hdr_len;

	ASSERT(cur_framelen >= TCP_MIN_HEADER_LEN);

	DHD_TRACE(("%s %d: TCP pkt!\n", __FUNCTION__, __LINE__));

	/* is it an ack ? Allow only ACK flag, not to suppress others. */
	if (new_tcp_hdr[TCP_FLAGS_OFFSET] != TCP_FLAG_ACK) {
		DHD_TRACE(("%s %d: Do not touch TCP flag 0x%x\n",
			__FUNCTION__, __LINE__, new_tcp_hdr[TCP_FLAGS_OFFSET]));
		goto exit;
	}

	new_ip_total_len = ntoh16_ua(&new_ip_hdr[IPV4_PKTLEN_OFFSET]);
	new_tcp_hdr_len = 4 * TCP_HDRLEN(new_tcp_hdr[TCP_HLEN_OFFSET]);

	/* This packet has TCP data, so just send */
	if (new_ip_total_len > new_ip_hdr_len + new_tcp_hdr_len) {
		DHD_TRACE(("%s %d: Do nothing for TCP DATA\n", __FUNCTION__, __LINE__));
		goto exit;
	}

	ASSERT(new_ip_total_len == new_ip_hdr_len + new_tcp_hdr_len);

	new_tcp_ack_num = ntoh32_ua(&new_tcp_hdr[TCP_ACK_NUM_OFFSET]);

	DHD_TRACE(("%s %d: TCP ACK with zero DATA length"
		" IP addr "IPV4_ADDR_STR" "IPV4_ADDR_STR" TCP port %d %d\n",
		__FUNCTION__, __LINE__,
		IPV4_ADDR_TO_STR(ntoh32_ua(&new_ip_hdr[IPV4_SRC_IP_OFFSET])),
		IPV4_ADDR_TO_STR(ntoh32_ua(&new_ip_hdr[IPV4_DEST_IP_OFFSET])),
		ntoh16_ua(&new_tcp_hdr[TCP_SRC_PORT_OFFSET]),
		ntoh16_ua(&new_tcp_hdr[TCP_DEST_PORT_OFFSET])));

	/* Look for tcp_ack_info that has the same ip src/dst addrs and tcp src/dst ports */
	flags = dhd_os_tcpacklock(dhdp);

	tcpack_sup_mod = dhdp->tcpack_sup_module;
	tcpack_info_tbl = tcpack_sup_mod->tcpack_info_tbl;

	if (!tcpack_sup_mod) {
		DHD_ERROR(("%s %d: tcpack suppress module NULL!!\n", __FUNCTION__, __LINE__));
		dhd_os_tcpackunlock(dhdp, flags);
		goto exit;
	}

	hold = TRUE;

	for (i = 0; i < TCPACK_INFO_MAXNUM; i++) {
		void *oldpkt;	/* TCPACK packet that is already in txq or DelayQ */
		uint8 *old_ether_hdr, *old_ip_hdr, *old_tcp_hdr;
		uint32 old_ip_hdr_len, old_tcp_hdr_len;
		uint32 old_tcpack_num;	/* TCP ACK number of old TCPACK packet in Q */

		if ((oldpkt = tcpack_info_tbl[i].pkt_in_q) == NULL) {
			if (free_slot == TCPACK_INFO_MAXNUM) {
				free_slot = i;
			}
			continue;
		}

		if (PKTDATA(dhdp->osh, oldpkt) == NULL) {
			DHD_ERROR(("%s %d: oldpkt data NULL!! cur idx %d\n",
				__FUNCTION__, __LINE__, i));
			hold = FALSE;
			dhd_os_tcpackunlock(dhdp, flags);
			goto exit;
		}

		old_ether_hdr = tcpack_info_tbl[i].pkt_ether_hdr;
		old_ip_hdr = old_ether_hdr + ETHER_HDR_LEN;
		old_ip_hdr_len = IPV4_HLEN(old_ip_hdr);
		old_tcp_hdr = old_ip_hdr + old_ip_hdr_len;
		old_tcp_hdr_len = 4 * TCP_HDRLEN(old_tcp_hdr[TCP_HLEN_OFFSET]);

		DHD_TRACE(("%s %d: oldpkt %p[%d], IP addr "IPV4_ADDR_STR" "IPV4_ADDR_STR
			" TCP port %d %d\n", __FUNCTION__, __LINE__, oldpkt, i,
			IPV4_ADDR_TO_STR(ntoh32_ua(&old_ip_hdr[IPV4_SRC_IP_OFFSET])),
			IPV4_ADDR_TO_STR(ntoh32_ua(&old_ip_hdr[IPV4_DEST_IP_OFFSET])),
			ntoh16_ua(&old_tcp_hdr[TCP_SRC_PORT_OFFSET]),
			ntoh16_ua(&old_tcp_hdr[TCP_DEST_PORT_OFFSET])));

		/* If either of IP address or TCP port number does not match, skip. */
		if (memcmp(&new_ip_hdr[IPV4_SRC_IP_OFFSET],
			&old_ip_hdr[IPV4_SRC_IP_OFFSET], IPV4_ADDR_LEN * 2) ||
			memcmp(&new_tcp_hdr[TCP_SRC_PORT_OFFSET],
			&old_tcp_hdr[TCP_SRC_PORT_OFFSET], TCP_PORT_LEN * 2)) {
			continue;
		}

		old_tcpack_num = ntoh32_ua(&old_tcp_hdr[TCP_ACK_NUM_OFFSET]);

		if (IS_TCPSEQ_GE(new_tcp_ack_num, old_tcpack_num)) {
			tcpack_info_tbl[i].supp_cnt++;
			if (tcpack_info_tbl[i].supp_cnt >= dhdp->tcpack_sup_ratio) {
				tcpack_info_tbl[i].pkt_in_q = NULL;
				tcpack_info_tbl[i].pkt_ether_hdr = NULL;
				tcpack_info_tbl[i].ifidx = 0;
				tcpack_info_tbl[i].supp_cnt = 0;
				hold = FALSE;
			} else {
				tcpack_info_tbl[i].pkt_in_q = pkt;
				tcpack_info_tbl[i].pkt_ether_hdr = new_ether_hdr;
				tcpack_info_tbl[i].ifidx = ifidx;
			}
			PKTFREE(dhdp->osh, oldpkt, TRUE);
		} else {
			PKTFREE(dhdp->osh, pkt, TRUE);
		}
		dhd_os_tcpackunlock(dhdp, flags);

		if (!hold) {
			del_timer_sync(&tcpack_info_tbl[i].timer);
		}
		goto exit;
	}

	if (free_slot < TCPACK_INFO_MAXNUM) {
		/* No TCPACK packet with the same IP addr and TCP port is found
		 * in tcp_ack_info_tbl. So add this packet to the table.
		 */
		DHD_TRACE(("%s %d: Add pkt 0x%p(ether_hdr 0x%p) to tbl[%d]\n",
			__FUNCTION__, __LINE__, pkt, new_ether_hdr,
			free_slot));

		tcpack_info_tbl[free_slot].pkt_in_q = pkt;
		tcpack_info_tbl[free_slot].pkt_ether_hdr = new_ether_hdr;
		tcpack_info_tbl[free_slot].ifidx = ifidx;
		tcpack_info_tbl[free_slot].supp_cnt = 1;
		mod_timer(&tcpack_sup_mod->tcpack_info_tbl[free_slot].timer,
			jiffies + msecs_to_jiffies(dhdp->tcpack_sup_delay));
		tcpack_sup_mod->tcpack_info_cnt++;
	} else {
		DHD_TRACE(("%s %d: No empty tcp ack info tbl\n",
			__FUNCTION__, __LINE__));
	}
	dhd_os_tcpackunlock(dhdp, flags);

exit:
	return hold;
}
bool
dhd_tcpack_suppress(dhd_pub_t *dhdp, void *pkt)
{
	uint8 *new_ether_hdr;	/* Ethernet header of the new packet */
	uint16 new_ether_type;	/* Ethernet type of the new packet */
	uint8 *new_ip_hdr;		/* IP header of the new packet */
	uint8 *new_tcp_hdr;		/* TCP header of the new packet */
	uint32 new_ip_hdr_len;	/* IP header length of the new packet */
	uint32 cur_framelen;
	uint32 new_tcp_ack_num;		/* TCP acknowledge number of the new packet */
	uint16 new_ip_total_len;	/* Total length of IP packet for the new packet */
	uint32 new_tcp_hdr_len;		/* TCP header length of the new packet */
	tcpack_sup_module_t *tcpack_sup_mod;
	tcpack_info_t *tcpack_info_tbl;
	int i;
	bool ret = FALSE;
	bool set_dotxinrx = TRUE;

	if (dhdp->tcpack_sup_mode == TCPACK_SUP_OFF)
		goto exit;

	new_ether_hdr = PKTDATA(dhdp->osh, pkt);
	cur_framelen = PKTLEN(dhdp->osh, pkt);

	if (cur_framelen < TCPACKSZMIN || cur_framelen > TCPACKSZMAX) {
		DHD_TRACE(("%s %d: Too short or long length %d to be TCP ACK\n",
			__FUNCTION__, __LINE__, cur_framelen));
		goto exit;
	}

	new_ether_type = new_ether_hdr[12] << 8 | new_ether_hdr[13];

	if (new_ether_type != ETHER_TYPE_IP) {
		DHD_TRACE(("%s %d: Not a IP packet 0x%x\n",
			__FUNCTION__, __LINE__, new_ether_type));
		goto exit;
	}

	DHD_TRACE(("%s %d: IP pkt! 0x%x\n", __FUNCTION__, __LINE__, new_ether_type));

	new_ip_hdr = new_ether_hdr + ETHER_HDR_LEN;
	cur_framelen -= ETHER_HDR_LEN;

	ASSERT(cur_framelen >= IPV4_MIN_HEADER_LEN);

	new_ip_hdr_len = IPV4_HLEN(new_ip_hdr);
	if (IP_VER(new_ip_hdr) != IP_VER_4 || IPV4_PROT(new_ip_hdr) != IP_PROT_TCP) {
		DHD_TRACE(("%s %d: Not IPv4 nor TCP! ip ver %d, prot %d\n",
			__FUNCTION__, __LINE__, IP_VER(new_ip_hdr), IPV4_PROT(new_ip_hdr)));
		goto exit;
	}

	new_tcp_hdr = new_ip_hdr + new_ip_hdr_len;
	cur_framelen -= new_ip_hdr_len;

	ASSERT(cur_framelen >= TCP_MIN_HEADER_LEN);

	DHD_TRACE(("%s %d: TCP pkt!\n", __FUNCTION__, __LINE__));

	/* is it an ack ? Allow only ACK flag, not to suppress others. */
	if (new_tcp_hdr[TCP_FLAGS_OFFSET] != TCP_FLAG_ACK) {
		DHD_TRACE(("%s %d: Do not touch TCP flag 0x%x\n",
			__FUNCTION__, __LINE__, new_tcp_hdr[TCP_FLAGS_OFFSET]));
		goto exit;
	}

	new_ip_total_len = ntoh16_ua(&new_ip_hdr[IPV4_PKTLEN_OFFSET]);
	new_tcp_hdr_len = 4 * TCP_HDRLEN(new_tcp_hdr[TCP_HLEN_OFFSET]);

	/* This packet has TCP data, so just send */
	if (new_ip_total_len > new_ip_hdr_len + new_tcp_hdr_len) {
		DHD_TRACE(("%s %d: Do nothing for TCP DATA\n", __FUNCTION__, __LINE__));
		goto exit;
	}

	ASSERT(new_ip_total_len == new_ip_hdr_len + new_tcp_hdr_len);

	new_tcp_ack_num = ntoh32_ua(&new_tcp_hdr[TCP_ACK_NUM_OFFSET]);

	DHD_TRACE(("%s %d: TCP ACK with zero DATA length"
		" IP addr "IPV4_ADDR_STR" "IPV4_ADDR_STR" TCP port %d %d\n",
		__FUNCTION__, __LINE__,
		IPV4_ADDR_TO_STR(ntoh32_ua(&new_ip_hdr[IPV4_SRC_IP_OFFSET])),
		IPV4_ADDR_TO_STR(ntoh32_ua(&new_ip_hdr[IPV4_DEST_IP_OFFSET])),
		ntoh16_ua(&new_tcp_hdr[TCP_SRC_PORT_OFFSET]),
		ntoh16_ua(&new_tcp_hdr[TCP_DEST_PORT_OFFSET])));

	/* Look for tcp_ack_info that has the same ip src/dst addrs and tcp src/dst ports */
	dhd_os_tcpacklock(dhdp);
#if defined(DEBUG_COUNTER) && defined(DHDTCPACK_SUP_DBG)
	counter_printlog(&tack_tbl);
	tack_tbl.cnt[0]++;
#endif /* DEBUG_COUNTER && DHDTCPACK_SUP_DBG */

	tcpack_sup_mod = dhdp->tcpack_sup_module;
	tcpack_info_tbl = tcpack_sup_mod->tcpack_info_tbl;

	if (!tcpack_sup_mod) {
		DHD_ERROR(("%s %d: tcpack suppress module NULL!!\n", __FUNCTION__, __LINE__));
		ret = BCME_ERROR;
		dhd_os_tcpackunlock(dhdp);
		goto exit;
	}

	if (dhd_tcpdata_psh_acked(dhdp, new_ip_hdr, new_tcp_hdr, new_tcp_ack_num)) {
		/* This TCPACK is ACK to TCPDATA PSH pkt, so keep set_dotxinrx TRUE */
#if defined(DEBUG_COUNTER) && defined(DHDTCPACK_SUP_DBG)
		tack_tbl.cnt[5]++;
#endif /* DEBUG_COUNTER && DHDTCPACK_SUP_DBG */
	} else
		set_dotxinrx = FALSE;

	for (i = 0; i < tcpack_sup_mod->tcpack_info_cnt; i++) {
		void *oldpkt;	/* TCPACK packet that is already in txq or DelayQ */
		uint8 *old_ether_hdr, *old_ip_hdr, *old_tcp_hdr;
		uint32 old_ip_hdr_len, old_tcp_hdr_len;
		uint32 old_tcpack_num;	/* TCP ACK number of old TCPACK packet in Q */

		if ((oldpkt = tcpack_info_tbl[i].pkt_in_q) == NULL) {
			DHD_ERROR(("%s %d: Unexpected error!! cur idx %d, ttl cnt %d\n",
				__FUNCTION__, __LINE__, i, tcpack_sup_mod->tcpack_info_cnt));
			break;
		}

		if (PKTDATA(dhdp->osh, oldpkt) == NULL) {
			DHD_ERROR(("%s %d: oldpkt data NULL!! cur idx %d, ttl cnt %d\n",
				__FUNCTION__, __LINE__, i, tcpack_sup_mod->tcpack_info_cnt));
			break;
		}

		old_ether_hdr = tcpack_info_tbl[i].pkt_ether_hdr;
		old_ip_hdr = old_ether_hdr + ETHER_HDR_LEN;
		old_ip_hdr_len = IPV4_HLEN(old_ip_hdr);
		old_tcp_hdr = old_ip_hdr + old_ip_hdr_len;
		old_tcp_hdr_len = 4 * TCP_HDRLEN(old_tcp_hdr[TCP_HLEN_OFFSET]);

		DHD_TRACE(("%s %d: oldpkt %p[%d], IP addr "IPV4_ADDR_STR" "IPV4_ADDR_STR
			" TCP port %d %d\n", __FUNCTION__, __LINE__, oldpkt, i,
			IPV4_ADDR_TO_STR(ntoh32_ua(&old_ip_hdr[IPV4_SRC_IP_OFFSET])),
			IPV4_ADDR_TO_STR(ntoh32_ua(&old_ip_hdr[IPV4_DEST_IP_OFFSET])),
			ntoh16_ua(&old_tcp_hdr[TCP_SRC_PORT_OFFSET]),
			ntoh16_ua(&old_tcp_hdr[TCP_DEST_PORT_OFFSET])));

		/* If either of IP address or TCP port number does not match, skip. */
		if (memcmp(&new_ip_hdr[IPV4_SRC_IP_OFFSET],
			&old_ip_hdr[IPV4_SRC_IP_OFFSET], IPV4_ADDR_LEN * 2) ||
			memcmp(&new_tcp_hdr[TCP_SRC_PORT_OFFSET],
			&old_tcp_hdr[TCP_SRC_PORT_OFFSET], TCP_PORT_LEN * 2))
			continue;

		old_tcpack_num = ntoh32_ua(&old_tcp_hdr[TCP_ACK_NUM_OFFSET]);

		if (IS_TCPSEQ_GT(new_tcp_ack_num, old_tcpack_num)) {
			/* New packet has higher TCP ACK number, so it replaces the old packet */
			if (new_ip_hdr_len == old_ip_hdr_len &&
				new_tcp_hdr_len == old_tcp_hdr_len) {
				ASSERT(memcmp(new_ether_hdr, old_ether_hdr, ETHER_HDR_LEN) == 0);
				bcopy(new_ip_hdr, old_ip_hdr, new_ip_total_len);
				PKTFREE(dhdp->osh, pkt, FALSE);
				DHD_TRACE(("%s %d: TCP ACK replace %u -> %u\n",
					__FUNCTION__, __LINE__, old_tcpack_num, new_tcp_ack_num));
#if defined(DEBUG_COUNTER) && defined(DHDTCPACK_SUP_DBG)
				tack_tbl.cnt[2]++;
#endif /* DEBUG_COUNTER && DHDTCPACK_SUP_DBG */
				ret = TRUE;
			} else {
#if defined(DEBUG_COUNTER) && defined(DHDTCPACK_SUP_DBG)
				tack_tbl.cnt[6]++;
#endif /* DEBUG_COUNTER && DHDTCPACK_SUP_DBG */
				DHD_TRACE(("%s %d: lenth mismatch %d != %d || %d != %d"
					" ACK %u -> %u\n", __FUNCTION__, __LINE__,
					new_ip_hdr_len, old_ip_hdr_len,
					new_tcp_hdr_len, old_tcp_hdr_len,
					old_tcpack_num, new_tcp_ack_num));
			}
		} else if (new_tcp_ack_num == old_tcpack_num) {
			set_dotxinrx = TRUE;
			/* TCPACK retransmission */
#if defined(DEBUG_COUNTER) && defined(DHDTCPACK_SUP_DBG)
			tack_tbl.cnt[3]++;
#endif /* DEBUG_COUNTER && DHDTCPACK_SUP_DBG */
		} else {
			DHD_TRACE(("%s %d: ACK number reverse old %u(0x%p) new %u(0x%p)\n",
				__FUNCTION__, __LINE__, old_tcpack_num, oldpkt,
				new_tcp_ack_num, pkt));
		}
		dhd_os_tcpackunlock(dhdp);
		goto exit;
	}

	if (i == tcpack_sup_mod->tcpack_info_cnt && i < TCPACK_INFO_MAXNUM) {
		/* No TCPACK packet with the same IP addr and TCP port is found
		 * in tcp_ack_info_tbl. So add this packet to the table.
		 */
		DHD_TRACE(("%s %d: Add pkt 0x%p(ether_hdr 0x%p) to tbl[%d]\n",
			__FUNCTION__, __LINE__, pkt, new_ether_hdr,
			tcpack_sup_mod->tcpack_info_cnt));

		tcpack_info_tbl[tcpack_sup_mod->tcpack_info_cnt].pkt_in_q = pkt;
		tcpack_info_tbl[tcpack_sup_mod->tcpack_info_cnt].pkt_ether_hdr = new_ether_hdr;
		tcpack_sup_mod->tcpack_info_cnt++;
#if defined(DEBUG_COUNTER) && defined(DHDTCPACK_SUP_DBG)
		tack_tbl.cnt[1]++;
#endif /* DEBUG_COUNTER && DHDTCPACK_SUP_DBG */
	} else {
		ASSERT(i == tcpack_sup_mod->tcpack_info_cnt);
		DHD_TRACE(("%s %d: No empty tcp ack info tbl\n",
			__FUNCTION__, __LINE__));
	}
	dhd_os_tcpackunlock(dhdp);

exit:
	/* Unless TCPACK_SUP_DELAYTX, dotxinrx is alwasy TRUE, so no need to set here */
	if (dhdp->tcpack_sup_mode == TCPACK_SUP_DELAYTX && set_dotxinrx)
		dhd_bus_set_dotxinrx(dhdp->bus, TRUE);

	return ret;
}
bool
dhd_tcpack_suppress(dhd_pub_t *dhdp, void *pkt)
{
    uint8 *new_ether_hdr;	/* Ethernet header of the new packet */
    uint16 new_ether_type;	/* Ethernet type of the new packet */
    uint8 *new_ip_hdr;		/* IP header of the new packet */
    uint8 *new_tcp_hdr;		/* TCP header of the new packet */
    uint32 new_ip_hdr_len;	/* IP header length of the new packet */
    uint32 cur_framelen;
#if defined(DHD_DEBUG)
    uint32 new_tcp_seq_num;		/* TCP sequence number of the new packet */
#endif
    uint32 new_tcp_ack_num;		/* TCP acknowledge number of the new packet */
    uint16 new_ip_total_len;	/* Total length of IP packet for the new packet */
    uint32 new_tcp_hdr_len;		/* TCP header length of the new packet */
    int i;
    bool ret = FALSE;

    if (!dhdp->tcpack_sup_enabled)
        goto exit;

    new_ether_hdr = PKTDATA(dhdp->osh, pkt);
    cur_framelen = PKTLEN(dhdp->osh, pkt);

    if (cur_framelen < TCPACKSZMIN || cur_framelen > TCPACKSZMAX) {
        DHD_TRACE(("%s %d: Too short or long length %d to be TCP ACK\n",
                   __FUNCTION__, __LINE__, cur_framelen));
        goto exit;
    }

    new_ether_type = new_ether_hdr[12] << 8 | new_ether_hdr[13];

    if (new_ether_type != ETHER_TYPE_IP) {
        DHD_TRACE(("%s %d: Not a IP packet 0x%x\n",
                   __FUNCTION__, __LINE__, new_ether_type));
        goto exit;
    }

    DHD_TRACE(("%s %d: IP pkt! 0x%x\n", __FUNCTION__, __LINE__, new_ether_type));

    new_ip_hdr = new_ether_hdr + ETHER_HDR_LEN;
    cur_framelen -= ETHER_HDR_LEN;

    ASSERT(cur_framelen >= IPV4_MIN_HEADER_LEN);

    new_ip_hdr_len = IPV4_HLEN(new_ip_hdr);
    if (IP_VER(new_ip_hdr) != IP_VER_4 || IPV4_PROT(new_ip_hdr) != IP_PROT_TCP) {
        DHD_TRACE(("%s %d: Not IPv4 nor TCP! ip ver %d, prot %d\n",
                   __FUNCTION__, __LINE__, IP_VER(new_ip_hdr), IPV4_PROT(new_ip_hdr)));
        goto exit;
    }

    new_tcp_hdr = new_ip_hdr + new_ip_hdr_len;
    cur_framelen -= new_ip_hdr_len;

    ASSERT(cur_framelen >= TCP_MIN_HEADER_LEN);

    DHD_TRACE(("%s %d: TCP pkt!\n", __FUNCTION__, __LINE__));

    /* is it an ack ? Allow only ACK flag, not to suppress others. */
    if (new_tcp_hdr[TCP_FLAGS_OFFSET] != TCP_FLAG_ACK) {
        DHD_TRACE(("%s %d: Do not touch TCP flag 0x%x\n",
                   __FUNCTION__, __LINE__, new_tcp_hdr[TCP_FLAGS_OFFSET]));
        goto exit;
    }

    new_ip_total_len = ntoh16_ua(&new_ip_hdr[IPV4_PKTLEN_OFFSET]);
    new_tcp_hdr_len = 4 * TCP_HDRLEN(new_tcp_hdr[TCP_HLEN_OFFSET]);

    /* This packet has TCP data, so just send */
    if (new_ip_total_len > new_ip_hdr_len + new_tcp_hdr_len) {
        DHD_TRACE(("%s %d: Do nothing for TCP DATA\n", __FUNCTION__, __LINE__));
        goto exit;
    }

    ASSERT(new_ip_total_len == new_ip_hdr_len + new_tcp_hdr_len);

    new_tcp_ack_num = ntoh32_ua(&new_tcp_hdr[TCP_ACK_NUM_OFFSET]);
#if defined(DHD_DEBUG)
    new_tcp_seq_num = ntoh32_ua(&new_tcp_hdr[TCP_SEQ_NUM_OFFSET]);
    DHD_TRACE(("%s %d: TCP ACK seq %u ack %u\n", __FUNCTION__, __LINE__,
               new_tcp_seq_num, new_tcp_ack_num));
#endif

    DHD_TRACE(("%s %d: TCP ACK with zero DATA length"
               " IP addr "IPv4_ADDR_STR" "IPv4_ADDR_STR" TCP port %d %d\n",
               __FUNCTION__, __LINE__,
               IPv4_ADDR_TO_STR(ntoh32_ua(&new_ip_hdr[IPV4_SRC_IP_OFFSET])),
               IPv4_ADDR_TO_STR(ntoh32_ua(&new_ip_hdr[IPV4_DEST_IP_OFFSET])),
               ntoh16_ua(&new_tcp_hdr[TCP_SRC_PORT_OFFSET]),
               ntoh16_ua(&new_tcp_hdr[TCP_DEST_PORT_OFFSET])));

    /* Look for tcp_ack_info that has the same ip src/dst addrs and tcp src/dst ports */
    dhd_os_tcpacklock(dhdp);
    for (i = 0; i < dhdp->tcp_ack_info_cnt; i++) {
        void *oldpkt;	/* TCPACK packet that is already in txq or DelayQ */
        uint8 *old_ether_hdr, *old_ip_hdr, *old_tcp_hdr;
        uint32 old_ip_hdr_len, old_tcp_hdr_len;
        uint32 old_tcpack_num;	/* TCP ACK number of old TCPACK packet in Q */

        if ((oldpkt = dhdp->tcp_ack_info_tbl[i].pkt_in_q) == NULL) {
            DHD_ERROR(("%s %d: Unexpected error!! cur idx %d, ttl cnt %d\n",
                       __FUNCTION__, __LINE__, i, dhdp->tcp_ack_info_cnt));
            break;
        }

        if (PKTDATA(dhdp->osh, oldpkt) == NULL) {
            DHD_ERROR(("%s %d: oldpkt data NULL!! cur idx %d, ttl cnt %d\n",
                       __FUNCTION__, __LINE__, i, dhdp->tcp_ack_info_cnt));
            break;
        }

        old_ether_hdr = dhdp->tcp_ack_info_tbl[i].pkt_ether_hdr;
        old_ip_hdr = old_ether_hdr + ETHER_HDR_LEN;
        old_ip_hdr_len = IPV4_HLEN(old_ip_hdr);
        old_tcp_hdr = old_ip_hdr + old_ip_hdr_len;
        old_tcp_hdr_len = 4 * TCP_HDRLEN(old_tcp_hdr[TCP_HLEN_OFFSET]);

        DHD_TRACE(("%s %d: oldpkt %p[%d], IP addr "IPv4_ADDR_STR" "IPv4_ADDR_STR
                   " TCP port %d %d\n", __FUNCTION__, __LINE__, oldpkt, i,
                   IPv4_ADDR_TO_STR(ntoh32_ua(&old_ip_hdr[IPV4_SRC_IP_OFFSET])),
                   IPv4_ADDR_TO_STR(ntoh32_ua(&old_ip_hdr[IPV4_DEST_IP_OFFSET])),
                   ntoh16_ua(&old_tcp_hdr[TCP_SRC_PORT_OFFSET]),
                   ntoh16_ua(&old_tcp_hdr[TCP_DEST_PORT_OFFSET])));

        /* If either of IP address or TCP port number does not match, skip. */
        if (memcmp(&new_ip_hdr[IPV4_SRC_IP_OFFSET],
                   &old_ip_hdr[IPV4_SRC_IP_OFFSET], IPV4_ADDR_LEN * 2) ||
                memcmp(&new_tcp_hdr[TCP_SRC_PORT_OFFSET],
                       &old_tcp_hdr[TCP_SRC_PORT_OFFSET], TCP_PORT_LEN * 2))
            continue;

        old_tcpack_num = ntoh32_ua(&old_tcp_hdr[TCP_ACK_NUM_OFFSET]);
        if (new_tcp_ack_num > old_tcpack_num) {
            /* New packet has higher TCP ACK number, so it replaces the old packet */
            if (new_ip_hdr_len == old_ip_hdr_len &&
                    new_tcp_hdr_len == old_tcp_hdr_len) {
                ASSERT(memcmp(new_ether_hdr, old_ether_hdr, ETHER_HDR_LEN) == 0);
                bcopy(new_ip_hdr, old_ip_hdr, new_ip_total_len);
                PKTFREE(dhdp->osh, pkt, FALSE);
                DHD_TRACE(("%s %d: TCP ACK replace %u -> %u\n",
                           __FUNCTION__, __LINE__, old_tcpack_num, new_tcp_ack_num));
                ret = TRUE;
            } else
                DHD_TRACE(("%s %d: lenth mismatch %d != %d || %d != %d\n",
                           __FUNCTION__, __LINE__, new_ip_hdr_len, old_ip_hdr_len,
                           new_tcp_hdr_len, old_tcp_hdr_len));
        } else {
            DHD_TRACE(("%s %d: ACK number reverse old %u(0x%p) new %u(0x%p)\n",
                       __FUNCTION__, __LINE__, old_tcpack_num, oldpkt,
                       new_tcp_ack_num, pkt));
#ifdef TCPACK_TEST
            if (new_ip_hdr_len == old_ip_hdr_len &&
                    new_tcp_hdr_len == old_tcp_hdr_len) {
                PKTFREE(dhdp->osh, pkt, FALSE);
                ret = TRUE;
            }
#endif
        }
        dhd_os_tcpackunlock(dhdp);
        goto exit;
    }

    if (i == dhdp->tcp_ack_info_cnt && i < MAXTCPSTREAMS) {
        /* No TCPACK packet with the same IP addr and TCP port is found
         * in tcp_ack_info_tbl. So add this packet to the table.
         */
        DHD_TRACE(("%s %d: Add pkt 0x%p(ether_hdr 0x%p) to tbl[%d]\n",
                   __FUNCTION__, __LINE__, pkt, new_ether_hdr, dhdp->tcp_ack_info_cnt));

        dhdp->tcp_ack_info_tbl[dhdp->tcp_ack_info_cnt].pkt_in_q = pkt;
        dhdp->tcp_ack_info_tbl[dhdp->tcp_ack_info_cnt].pkt_ether_hdr = new_ether_hdr;
        dhdp->tcp_ack_info_cnt++;
    } else {
        ASSERT(i == dhdp->tcp_ack_info_cnt);
        DHD_TRACE(("%s %d: No empty tcp ack info tbl\n",
                   __FUNCTION__, __LINE__));
    }
    dhd_os_tcpackunlock(dhdp);

exit:
    return ret;
}