inline int dhd_tcpack_check_xmit(dhd_pub_t *dhdp, void *pkt)
{
uint8 i;
tcpack_sup_module_t *tcpack_sup_mod;
tcpack_info_t *tcpack_info_tbl;
int tbl_cnt;
int ret = BCME_OK;
void *pdata;
uint32 pktlen;
if (dhdp->tcpack_sup_mode == TCPACK_SUP_OFF)
goto exit;
pdata = PKTDATA(dhdp->osh, pkt);
pktlen = PKTLEN(dhdp->osh, pkt) - dhd_prot_hdrlen(dhdp, pdata);
if (pktlen < TCPACKSZMIN || pktlen > TCPACKSZMAX) {
DHD_TRACE(("%s %d: Too short or long length %d to be TCP ACK\n",
__FUNCTION__, __LINE__, pktlen));
goto exit;
}
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;
}
tbl_cnt = tcpack_sup_mod->tcpack_info_cnt;
tcpack_info_tbl = tcpack_sup_mod->tcpack_info_tbl;
ASSERT(tbl_cnt <= TCPACK_INFO_MAXNUM);
for (i = 0; i < tbl_cnt; i++) {
if (tcpack_info_tbl[i].pkt_in_q == pkt) {
DHD_TRACE(("%s %d: pkt %p sent out. idx %d, tbl_cnt %d\n",
__FUNCTION__, __LINE__, pkt, i, tbl_cnt));
/* This pkt is being transmitted so remove the tcp_ack_info of it. */
if (i < tbl_cnt - 1) {
bcopy(&tcpack_info_tbl[tbl_cnt - 1],
&tcpack_info_tbl[i], sizeof(tcpack_info_t));
}
bzero(&tcpack_info_tbl[tbl_cnt - 1], sizeof(tcpack_info_t));
if (--tcpack_sup_mod->tcpack_info_cnt < 0) {
DHD_ERROR(("%s %d: ERROR!!! tcp_ack_info_cnt %d\n",
__FUNCTION__, __LINE__, tcpack_sup_mod->tcpack_info_cnt));
ret = BCME_ERROR;
}
break;
}
}
dhd_os_tcpackunlock(dhdp);
exit:
return ret;
}
void
dhd_tcpack_info_tbl_clean(dhd_pub_t *dhdp)
{
tcpack_sup_module_t *tcpack_sup_mod = dhdp->tcpack_sup_module;
int i;
unsigned long flags;
if (dhdp->tcpack_sup_mode == TCPACK_SUP_OFF)
goto exit;
flags = dhd_os_tcpacklock(dhdp);
if (!tcpack_sup_mod) {
DHD_ERROR(("%s %d: tcpack suppress module NULL!!\n",
__FUNCTION__, __LINE__));
dhd_os_tcpackunlock(dhdp, flags);
goto exit;
}
if (dhdp->tcpack_sup_mode == TCPACK_SUP_HOLD) {
for (i = 0; i < TCPACK_INFO_MAXNUM; i++) {
if (tcpack_sup_mod->tcpack_info_tbl[i].pkt_in_q) {
PKTFREE(dhdp->osh, tcpack_sup_mod->tcpack_info_tbl[i].pkt_in_q,
TRUE);
tcpack_sup_mod->tcpack_info_tbl[i].pkt_in_q = NULL;
tcpack_sup_mod->tcpack_info_tbl[i].pkt_ether_hdr = NULL;
tcpack_sup_mod->tcpack_info_tbl[i].ifidx = 0;
tcpack_sup_mod->tcpack_info_tbl[i].supp_cnt = 0;
}
}
} else {
tcpack_sup_mod->tcpack_info_cnt = 0;
bzero(tcpack_sup_mod->tcpack_info_tbl, sizeof(tcpack_info_t) * TCPACK_INFO_MAXNUM);
}
dhd_os_tcpackunlock(dhdp, flags);
if (dhdp->tcpack_sup_mode == TCPACK_SUP_HOLD) {
for (i = 0; i < TCPACK_INFO_MAXNUM; i++) {
del_timer_sync(&tcpack_sup_mod->tcpack_info_tbl[i].timer);
}
}
exit:
return;
}
static void dhd_tcpack_send(ulong data)
{
tcpack_sup_module_t *tcpack_sup_mod;
tcpack_info_t *cur_tbl = (tcpack_info_t *)data;
dhd_pub_t *dhdp;
int ifidx;
void* pkt;
unsigned long flags;
if (!cur_tbl) {
return;
}
dhdp = cur_tbl->dhdp;
if (!dhdp) {
return;
}
flags = dhd_os_tcpacklock(dhdp);
tcpack_sup_mod = dhdp->tcpack_sup_module;
pkt = cur_tbl->pkt_in_q;
ifidx = cur_tbl->ifidx;
if (!pkt) {
dhd_os_tcpackunlock(dhdp, flags);
return;
}
cur_tbl->pkt_in_q = NULL;
cur_tbl->pkt_ether_hdr = NULL;
cur_tbl->ifidx = 0;
cur_tbl->supp_cnt = 0;
if (--tcpack_sup_mod->tcpack_info_cnt < 0) {
DHD_ERROR(("%s %d: ERROR!!! tcp_ack_info_cnt %d\n",
__FUNCTION__, __LINE__, tcpack_sup_mod->tcpack_info_cnt));
}
dhd_os_tcpackunlock(dhdp, flags);
dhd_sendpkt(dhdp, ifidx, pkt);
}
void
dhd_tcpack_info_tbl_clean(dhd_pub_t *dhdp)
{
if (!dhdp->tcpack_sup_enabled)
goto exit;
dhd_os_tcpacklock(dhdp);
dhdp->tcp_ack_info_cnt = 0;
bzero(&dhdp->tcp_ack_info_tbl, sizeof(struct tcp_ack_info) * MAXTCPSTREAMS);
dhd_os_tcpackunlock(dhdp);
exit:
return;
}
inline int dhd_tcpack_check_xmit(dhd_pub_t *dhdp, void *pkt)
{
uint8 i;
tcp_ack_info_t *tcp_ack_info = NULL;
int tbl_cnt;
uint pushed_len;
int ret = BCME_OK;
void *pdata;
uint32 pktlen;
if (!dhdp->tcpack_sup_enabled)
return ret;
pdata = PKTDATA(dhdp->osh, pkt);
/* Length of BDC(+WLFC) headers pushed */
pushed_len = BDC_HEADER_LEN + (((struct bdc_header *)pdata)->dataOffset * 4);
pktlen = PKTLEN(dhdp->osh, pkt) - pushed_len;
if (pktlen < TCPACKSZMIN || pktlen > TCPACKSZMAX) {
DHD_TRACE(("%s %d: Too short or long length %d to be TCP ACK\n",
__FUNCTION__, __LINE__, pktlen));
return ret;
}
dhd_os_tcpacklock(dhdp);
tbl_cnt = dhdp->tcp_ack_info_cnt;
for (i = 0; i < tbl_cnt; i++) {
tcp_ack_info = &dhdp->tcp_ack_info_tbl[i];
if (tcp_ack_info->pkt_in_q == pkt) {
DHD_TRACE(("%s %d: pkt %p sent out. idx %d, tbl_cnt %d\n",
__FUNCTION__, __LINE__, pkt, i, tbl_cnt));
/* This pkt is being transmitted so remove the tcp_ack_info of it. */
if (i < tbl_cnt - 1) {
bcopy(&dhdp->tcp_ack_info_tbl[tbl_cnt - 1],
&dhdp->tcp_ack_info_tbl[i], sizeof(struct tcp_ack_info));
}
bzero(&dhdp->tcp_ack_info_tbl[tbl_cnt - 1], sizeof(struct tcp_ack_info));
if (--dhdp->tcp_ack_info_cnt < 0) {
DHD_ERROR(("%s %d: ERROR!!! tcp_ack_info_cnt %d\n",
__FUNCTION__, __LINE__, dhdp->tcp_ack_info_cnt));
ret = BCME_ERROR;
}
break;
}
}
dhd_os_tcpackunlock(dhdp);
return ret;
}
void
dhd_tcpack_info_tbl_clean(dhd_pub_t *dhdp)
{
tcpack_sup_module_t *tcpack_sup_mod = dhdp->tcpack_sup_module;
if (dhdp->tcpack_sup_mode == TCPACK_SUP_OFF)
goto exit;
dhd_os_tcpacklock(dhdp);
if (!tcpack_sup_mod) {
DHD_ERROR(("%s %d: tcpack suppress module NULL!!\n",
__FUNCTION__, __LINE__));
dhd_os_tcpackunlock(dhdp);
goto exit;
}
tcpack_sup_mod->tcpack_info_cnt = 0;
bzero(tcpack_sup_mod->tcpack_info_tbl, sizeof(tcpack_info_t) * TCPACK_INFO_MAXNUM);
dhd_os_tcpackunlock(dhdp);
exit:
return;
}
void dhd_tcpack_suppress_set(dhd_pub_t *dhdp, bool on)
{
if (dhdp->tcpack_sup_enabled != on) {
DHD_ERROR(("%s %d: %d -> %d\n", __FUNCTION__, __LINE__,
dhdp->tcpack_sup_enabled, on));
dhd_os_tcpacklock(dhdp);
dhdp->tcpack_sup_enabled = on;
dhdp->tcp_ack_info_cnt = 0;
bzero(dhdp->tcp_ack_info_tbl, sizeof(struct tcp_ack_info) * MAXTCPSTREAMS);
dhd_os_tcpackunlock(dhdp);
} else
DHD_ERROR(("%s %d: already %d\n", __FUNCTION__, __LINE__, on));
return;
}
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_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;
}
int dhd_tcpack_suppress_set(dhd_pub_t *dhdp, uint8 mode)
{
int ret = BCME_OK;
dhd_os_tcpacklock(dhdp);
if (dhdp->tcpack_sup_mode == mode) {
DHD_ERROR(("%s %d: already set to %d\n", __FUNCTION__, __LINE__, mode));
goto exit;
}
if (mode >= TCPACK_SUP_LAST_MODE ||
#ifndef BCMSDIO
mode == TCPACK_SUP_DELAYTX ||
#endif
FALSE) {
DHD_ERROR(("%s %d: Invalid mode %d\n", __FUNCTION__, __LINE__, mode));
ret = BCME_BADARG;
goto exit;
}
DHD_TRACE(("%s: %d -> %d\n",
__FUNCTION__, dhdp->tcpack_sup_mode, mode));
/* Old tcpack_sup_mode is TCPACK_SUP_DELAYTX */
if (dhdp->tcpack_sup_mode == TCPACK_SUP_DELAYTX) {
tcpack_sup_module_t *tcpack_sup_mod = dhdp->tcpack_sup_module;
/* We won't need tdata_psh_info pool and tcpddata_info_tbl anymore */
_tdata_psh_info_pool_deinit(dhdp, tcpack_sup_mod);
tcpack_sup_mod->tcpdata_info_cnt = 0;
bzero(tcpack_sup_mod->tcpdata_info_tbl,
sizeof(tcpdata_info_t) * TCPDATA_INFO_MAXNUM);
/* For half duplex bus interface, tx precedes rx by default */
if (dhdp->bus)
dhd_bus_set_dotxinrx(dhdp->bus, TRUE);
}
dhdp->tcpack_sup_mode = mode;
if (mode == TCPACK_SUP_OFF) {
ASSERT(dhdp->tcpack_sup_module != NULL);
MFREE(dhdp->osh, dhdp->tcpack_sup_module, sizeof(tcpack_sup_module_t));
dhdp->tcpack_sup_module = NULL;
goto exit;
}
if (dhdp->tcpack_sup_module == NULL) {
tcpack_sup_module_t *tcpack_sup_mod =
MALLOC(dhdp->osh, sizeof(tcpack_sup_module_t));
if (tcpack_sup_mod == NULL) {
DHD_ERROR(("%s %d: No MEM\n", __FUNCTION__, __LINE__));
dhdp->tcpack_sup_mode = TCPACK_SUP_OFF;
ret = BCME_NOMEM;
goto exit;
}
bzero(tcpack_sup_mod, sizeof(tcpack_sup_module_t));
dhdp->tcpack_sup_module = tcpack_sup_mod;
}
if (mode == TCPACK_SUP_DELAYTX) {
ret = _tdata_psh_info_pool_init(dhdp, dhdp->tcpack_sup_module);
if (ret != BCME_OK)
DHD_ERROR(("%s %d: pool init fail with %d\n", __FUNCTION__, __LINE__, ret));
else if (dhdp->bus)
dhd_bus_set_dotxinrx(dhdp->bus, FALSE);
}
exit:
dhd_os_tcpackunlock(dhdp);
return ret;
}
int dhd_tcpack_suppress_set(dhd_pub_t *dhdp, uint8 mode)
{
int ret = BCME_OK;
unsigned long flags;
flags = dhd_os_tcpacklock(dhdp);
if (dhdp->tcpack_sup_mode == mode) {
DHD_ERROR(("%s %d: already set to %d\n", __FUNCTION__, __LINE__, mode));
goto exit;
}
if (mode >= TCPACK_SUP_LAST_MODE ||
#ifndef BCMSDIO
mode == TCPACK_SUP_DELAYTX ||
#endif /* !BCMSDIO */
FALSE) {
DHD_ERROR(("%s %d: Invalid mode %d\n", __FUNCTION__, __LINE__, mode));
ret = BCME_BADARG;
goto exit;
}
DHD_TRACE(("%s: %d -> %d\n",
__FUNCTION__, dhdp->tcpack_sup_mode, mode));
#ifdef BCMSDIO
/* Old tcpack_sup_mode is TCPACK_SUP_DELAYTX */
if (dhdp->tcpack_sup_mode == TCPACK_SUP_DELAYTX) {
tcpack_sup_module_t *tcpack_sup_mod = dhdp->tcpack_sup_module;
/* We won't need tdata_psh_info pool and tcpddata_info_tbl anymore */
_tdata_psh_info_pool_deinit(dhdp, tcpack_sup_mod);
tcpack_sup_mod->tcpdata_info_cnt = 0;
bzero(tcpack_sup_mod->tcpdata_info_tbl,
sizeof(tcpdata_info_t) * TCPDATA_INFO_MAXNUM);
/* For half duplex bus interface, tx precedes rx by default */
if (dhdp->bus)
dhd_bus_set_dotxinrx(dhdp->bus, TRUE);
}
#endif
dhdp->tcpack_sup_mode = mode;
if (mode == TCPACK_SUP_OFF) {
ASSERT(dhdp->tcpack_sup_module != NULL);
/* Clean up timer/data structure for any remaining/pending packet or timer. */
dhd_tcpack_info_tbl_clean(dhdp);
MFREE(dhdp->osh, dhdp->tcpack_sup_module, sizeof(tcpack_sup_module_t));
dhdp->tcpack_sup_module = NULL;
goto exit;
}
if (dhdp->tcpack_sup_module == NULL) {
tcpack_sup_module_t *tcpack_sup_mod =
MALLOC(dhdp->osh, sizeof(tcpack_sup_module_t));
if (tcpack_sup_mod == NULL) {
DHD_ERROR(("%s %d: No MEM\n", __FUNCTION__, __LINE__));
dhdp->tcpack_sup_mode = TCPACK_SUP_OFF;
ret = BCME_NOMEM;
goto exit;
}
bzero(tcpack_sup_mod, sizeof(tcpack_sup_module_t));
dhdp->tcpack_sup_module = tcpack_sup_mod;
}
#ifdef BCMSDIO
if (mode == TCPACK_SUP_DELAYTX) {
ret = _tdata_psh_info_pool_init(dhdp, dhdp->tcpack_sup_module);
if (ret != BCME_OK)
DHD_ERROR(("%s %d: pool init fail with %d\n", __FUNCTION__, __LINE__, ret));
else if (dhdp->bus)
dhd_bus_set_dotxinrx(dhdp->bus, FALSE);
}
#endif /* BCMSDIO */
if (mode == TCPACK_SUP_HOLD) {
int i;
tcpack_sup_module_t *tcpack_sup_mod =
(tcpack_sup_module_t *)dhdp->tcpack_sup_module;
dhdp->tcpack_sup_ratio = TCPACK_SUPP_RATIO;
dhdp->tcpack_sup_delay = TCPACK_DELAY_TIME;
for (i = 0; i < TCPACK_INFO_MAXNUM; i++)
{
tcpack_sup_mod->tcpack_info_tbl[i].dhdp = dhdp;
init_timer(&tcpack_sup_mod->tcpack_info_tbl[i].timer);
tcpack_sup_mod->tcpack_info_tbl[i].timer.data =
(ulong)&tcpack_sup_mod->tcpack_info_tbl[i];
tcpack_sup_mod->tcpack_info_tbl[i].timer.function = dhd_tcpack_send;
}
}
exit:
dhd_os_tcpackunlock(dhdp, flags);
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;
#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;
}
