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OpenCloudOS-Kernel/drivers/net/wireless/mwifiex/util.c

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/*
* Marvell Wireless LAN device driver: utility functions
*
* Copyright (C) 2011-2014, Marvell International Ltd.
*
* This software file (the "File") is distributed by Marvell International
* Ltd. under the terms of the GNU General Public License Version 2, June 1991
* (the "License"). You may use, redistribute and/or modify this File in
* accordance with the terms and conditions of the License, a copy of which
* is available by writing to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
* worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
*
* THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
* IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
* ARE EXPRESSLY DISCLAIMED. The License provides additional details about
* this warranty disclaimer.
*/
#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"
static struct mwifiex_debug_data items[] = {
{"debug_mask", item_size(debug_mask),
item_addr(debug_mask), 1},
{"int_counter", item_size(int_counter),
item_addr(int_counter), 1},
{"wmm_ac_vo", item_size(packets_out[WMM_AC_VO]),
item_addr(packets_out[WMM_AC_VO]), 1},
{"wmm_ac_vi", item_size(packets_out[WMM_AC_VI]),
item_addr(packets_out[WMM_AC_VI]), 1},
{"wmm_ac_be", item_size(packets_out[WMM_AC_BE]),
item_addr(packets_out[WMM_AC_BE]), 1},
{"wmm_ac_bk", item_size(packets_out[WMM_AC_BK]),
item_addr(packets_out[WMM_AC_BK]), 1},
{"tx_buf_size", item_size(tx_buf_size),
item_addr(tx_buf_size), 1},
{"curr_tx_buf_size", item_size(curr_tx_buf_size),
item_addr(curr_tx_buf_size), 1},
{"ps_mode", item_size(ps_mode),
item_addr(ps_mode), 1},
{"ps_state", item_size(ps_state),
item_addr(ps_state), 1},
{"is_deep_sleep", item_size(is_deep_sleep),
item_addr(is_deep_sleep), 1},
{"wakeup_dev_req", item_size(pm_wakeup_card_req),
item_addr(pm_wakeup_card_req), 1},
{"wakeup_tries", item_size(pm_wakeup_fw_try),
item_addr(pm_wakeup_fw_try), 1},
{"hs_configured", item_size(is_hs_configured),
item_addr(is_hs_configured), 1},
{"hs_activated", item_size(hs_activated),
item_addr(hs_activated), 1},
{"num_tx_timeout", item_size(num_tx_timeout),
item_addr(num_tx_timeout), 1},
{"is_cmd_timedout", item_size(is_cmd_timedout),
item_addr(is_cmd_timedout), 1},
{"timeout_cmd_id", item_size(timeout_cmd_id),
item_addr(timeout_cmd_id), 1},
{"timeout_cmd_act", item_size(timeout_cmd_act),
item_addr(timeout_cmd_act), 1},
{"last_cmd_id", item_size(last_cmd_id),
item_addr(last_cmd_id), DBG_CMD_NUM},
{"last_cmd_act", item_size(last_cmd_act),
item_addr(last_cmd_act), DBG_CMD_NUM},
{"last_cmd_index", item_size(last_cmd_index),
item_addr(last_cmd_index), 1},
{"last_cmd_resp_id", item_size(last_cmd_resp_id),
item_addr(last_cmd_resp_id), DBG_CMD_NUM},
{"last_cmd_resp_index", item_size(last_cmd_resp_index),
item_addr(last_cmd_resp_index), 1},
{"last_event", item_size(last_event),
item_addr(last_event), DBG_CMD_NUM},
{"last_event_index", item_size(last_event_index),
item_addr(last_event_index), 1},
{"num_cmd_h2c_fail", item_size(num_cmd_host_to_card_failure),
item_addr(num_cmd_host_to_card_failure), 1},
{"num_cmd_sleep_cfm_fail",
item_size(num_cmd_sleep_cfm_host_to_card_failure),
item_addr(num_cmd_sleep_cfm_host_to_card_failure), 1},
{"num_tx_h2c_fail", item_size(num_tx_host_to_card_failure),
item_addr(num_tx_host_to_card_failure), 1},
{"num_evt_deauth", item_size(num_event_deauth),
item_addr(num_event_deauth), 1},
{"num_evt_disassoc", item_size(num_event_disassoc),
item_addr(num_event_disassoc), 1},
{"num_evt_link_lost", item_size(num_event_link_lost),
item_addr(num_event_link_lost), 1},
{"num_cmd_deauth", item_size(num_cmd_deauth),
item_addr(num_cmd_deauth), 1},
{"num_cmd_assoc_ok", item_size(num_cmd_assoc_success),
item_addr(num_cmd_assoc_success), 1},
{"num_cmd_assoc_fail", item_size(num_cmd_assoc_failure),
item_addr(num_cmd_assoc_failure), 1},
{"cmd_sent", item_size(cmd_sent),
item_addr(cmd_sent), 1},
{"data_sent", item_size(data_sent),
item_addr(data_sent), 1},
{"cmd_resp_received", item_size(cmd_resp_received),
item_addr(cmd_resp_received), 1},
{"event_received", item_size(event_received),
item_addr(event_received), 1},
/* variables defined in struct mwifiex_adapter */
{"cmd_pending", adapter_item_size(cmd_pending),
adapter_item_addr(cmd_pending), 1},
{"tx_pending", adapter_item_size(tx_pending),
adapter_item_addr(tx_pending), 1},
{"rx_pending", adapter_item_size(rx_pending),
adapter_item_addr(rx_pending), 1},
};
static int num_of_items = ARRAY_SIZE(items);
/*
* Firmware initialization complete callback handler.
*
* This function wakes up the function waiting on the init
* wait queue for the firmware initialization to complete.
*/
int mwifiex_init_fw_complete(struct mwifiex_adapter *adapter)
{
adapter->init_wait_q_woken = true;
wake_up_interruptible(&adapter->init_wait_q);
return 0;
}
/*
* Firmware shutdown complete callback handler.
*
* This function sets the hardware status to not ready and wakes up
* the function waiting on the init wait queue for the firmware
* shutdown to complete.
*/
int mwifiex_shutdown_fw_complete(struct mwifiex_adapter *adapter)
{
adapter->hw_status = MWIFIEX_HW_STATUS_NOT_READY;
adapter->init_wait_q_woken = true;
wake_up_interruptible(&adapter->init_wait_q);
return 0;
}
/*
* This function sends init/shutdown command
* to firmware.
*/
int mwifiex_init_shutdown_fw(struct mwifiex_private *priv,
u32 func_init_shutdown)
{
u16 cmd;
if (func_init_shutdown == MWIFIEX_FUNC_INIT) {
cmd = HostCmd_CMD_FUNC_INIT;
} else if (func_init_shutdown == MWIFIEX_FUNC_SHUTDOWN) {
cmd = HostCmd_CMD_FUNC_SHUTDOWN;
} else {
mwifiex_dbg(priv->adapter, ERROR,
"unsupported parameter\n");
return -1;
}
return mwifiex_send_cmd(priv, cmd, HostCmd_ACT_GEN_SET, 0, NULL, true);
}
EXPORT_SYMBOL_GPL(mwifiex_init_shutdown_fw);
/*
* IOCTL request handler to set/get debug information.
*
* This function collates/sets the information from/to different driver
* structures.
*/
int mwifiex_get_debug_info(struct mwifiex_private *priv,
struct mwifiex_debug_info *info)
{
struct mwifiex_adapter *adapter = priv->adapter;
if (info) {
info->debug_mask = adapter->debug_mask;
memcpy(info->packets_out,
priv->wmm.packets_out,
sizeof(priv->wmm.packets_out));
info->curr_tx_buf_size = (u32) adapter->curr_tx_buf_size;
info->tx_buf_size = (u32) adapter->tx_buf_size;
info->rx_tbl_num = mwifiex_get_rx_reorder_tbl(priv,
info->rx_tbl);
info->tx_tbl_num = mwifiex_get_tx_ba_stream_tbl(priv,
info->tx_tbl);
info->tdls_peer_num = mwifiex_get_tdls_list(priv,
info->tdls_list);
info->ps_mode = adapter->ps_mode;
info->ps_state = adapter->ps_state;
info->is_deep_sleep = adapter->is_deep_sleep;
info->pm_wakeup_card_req = adapter->pm_wakeup_card_req;
info->pm_wakeup_fw_try = adapter->pm_wakeup_fw_try;
info->is_hs_configured = adapter->is_hs_configured;
info->hs_activated = adapter->hs_activated;
info->is_cmd_timedout = adapter->is_cmd_timedout;
info->num_cmd_host_to_card_failure
= adapter->dbg.num_cmd_host_to_card_failure;
info->num_cmd_sleep_cfm_host_to_card_failure
= adapter->dbg.num_cmd_sleep_cfm_host_to_card_failure;
info->num_tx_host_to_card_failure
= adapter->dbg.num_tx_host_to_card_failure;
info->num_event_deauth = adapter->dbg.num_event_deauth;
info->num_event_disassoc = adapter->dbg.num_event_disassoc;
info->num_event_link_lost = adapter->dbg.num_event_link_lost;
info->num_cmd_deauth = adapter->dbg.num_cmd_deauth;
info->num_cmd_assoc_success =
adapter->dbg.num_cmd_assoc_success;
info->num_cmd_assoc_failure =
adapter->dbg.num_cmd_assoc_failure;
info->num_tx_timeout = adapter->dbg.num_tx_timeout;
info->timeout_cmd_id = adapter->dbg.timeout_cmd_id;
info->timeout_cmd_act = adapter->dbg.timeout_cmd_act;
memcpy(info->last_cmd_id, adapter->dbg.last_cmd_id,
sizeof(adapter->dbg.last_cmd_id));
memcpy(info->last_cmd_act, adapter->dbg.last_cmd_act,
sizeof(adapter->dbg.last_cmd_act));
info->last_cmd_index = adapter->dbg.last_cmd_index;
memcpy(info->last_cmd_resp_id, adapter->dbg.last_cmd_resp_id,
sizeof(adapter->dbg.last_cmd_resp_id));
info->last_cmd_resp_index = adapter->dbg.last_cmd_resp_index;
memcpy(info->last_event, adapter->dbg.last_event,
sizeof(adapter->dbg.last_event));
info->last_event_index = adapter->dbg.last_event_index;
info->data_sent = adapter->data_sent;
info->cmd_sent = adapter->cmd_sent;
info->cmd_resp_received = adapter->cmd_resp_received;
}
return 0;
}
int mwifiex_debug_info_to_buffer(struct mwifiex_private *priv, char *buf,
struct mwifiex_debug_info *info)
{
char *p = buf;
struct mwifiex_debug_data *d = &items[0];
size_t size, addr;
long val;
int i, j;
if (!info)
return 0;
for (i = 0; i < num_of_items; i++) {
p += sprintf(p, "%s=", d[i].name);
size = d[i].size / d[i].num;
if (i < (num_of_items - 3))
addr = d[i].addr + (size_t)info;
else /* The last 3 items are struct mwifiex_adapter variables */
addr = d[i].addr + (size_t)priv->adapter;
for (j = 0; j < d[i].num; j++) {
switch (size) {
case 1:
val = *((u8 *)addr);
break;
case 2:
val = *((u16 *)addr);
break;
case 4:
val = *((u32 *)addr);
break;
case 8:
val = *((long long *)addr);
break;
default:
val = -1;
break;
}
p += sprintf(p, "%#lx ", val);
addr += size;
}
p += sprintf(p, "\n");
}
if (info->tx_tbl_num) {
p += sprintf(p, "Tx BA stream table:\n");
for (i = 0; i < info->tx_tbl_num; i++)
p += sprintf(p, "tid = %d, ra = %pM\n",
info->tx_tbl[i].tid, info->tx_tbl[i].ra);
}
if (info->rx_tbl_num) {
p += sprintf(p, "Rx reorder table:\n");
for (i = 0; i < info->rx_tbl_num; i++) {
p += sprintf(p, "tid = %d, ta = %pM, ",
info->rx_tbl[i].tid,
info->rx_tbl[i].ta);
p += sprintf(p, "start_win = %d, ",
info->rx_tbl[i].start_win);
p += sprintf(p, "win_size = %d, buffer: ",
info->rx_tbl[i].win_size);
for (j = 0; j < info->rx_tbl[i].win_size; j++)
p += sprintf(p, "%c ",
info->rx_tbl[i].buffer[j] ?
'1' : '0');
p += sprintf(p, "\n");
}
}
if (info->tdls_peer_num) {
p += sprintf(p, "TDLS peer table:\n");
for (i = 0; i < info->tdls_peer_num; i++) {
p += sprintf(p, "peer = %pM",
info->tdls_list[i].peer_addr);
p += sprintf(p, "\n");
}
}
return p - buf;
}
static int
mwifiex_parse_mgmt_packet(struct mwifiex_private *priv, u8 *payload, u16 len,
struct rxpd *rx_pd)
{
u16 stype;
u8 category, action_code, *addr2;
struct ieee80211_hdr *ieee_hdr = (void *)payload;
stype = (le16_to_cpu(ieee_hdr->frame_control) & IEEE80211_FCTL_STYPE);
switch (stype) {
case IEEE80211_STYPE_ACTION:
category = *(payload + sizeof(struct ieee80211_hdr));
switch (category) {
case WLAN_CATEGORY_PUBLIC:
action_code = *(payload + sizeof(struct ieee80211_hdr)
+ 1);
if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) {
addr2 = ieee_hdr->addr2;
mwifiex_dbg(priv->adapter, INFO,
"TDLS discovery response %pM nf=%d, snr=%d\n",
addr2, rx_pd->nf, rx_pd->snr);
mwifiex_auto_tdls_update_peer_signal(priv,
addr2,
rx_pd->snr,
rx_pd->nf);
}
break;
case WLAN_CATEGORY_BACK:
/*we dont indicate BACK action frames to cfg80211*/
mwifiex_dbg(priv->adapter, INFO,
"drop BACK action frames");
return -1;
default:
mwifiex_dbg(priv->adapter, INFO,
"unknown public action frame category %d\n",
category);
}
default:
mwifiex_dbg(priv->adapter, INFO,
"unknown mgmt frame subtype %#x\n", stype);
return 0;
}
return 0;
}
/*
* This function processes the received management packet and send it
* to the kernel.
*/
int
mwifiex_process_mgmt_packet(struct mwifiex_private *priv,
struct sk_buff *skb)
{
struct rxpd *rx_pd;
u16 pkt_len;
struct ieee80211_hdr *ieee_hdr;
if (!skb)
return -1;
if (!priv->mgmt_frame_mask ||
priv->wdev.iftype == NL80211_IFTYPE_UNSPECIFIED) {
mwifiex_dbg(priv->adapter, ERROR,
"do not receive mgmt frames on uninitialized intf");
return -1;
}
rx_pd = (struct rxpd *)skb->data;
skb_pull(skb, le16_to_cpu(rx_pd->rx_pkt_offset));
skb_pull(skb, sizeof(pkt_len));
pkt_len = le16_to_cpu(rx_pd->rx_pkt_length);
ieee_hdr = (void *)skb->data;
if (ieee80211_is_mgmt(ieee_hdr->frame_control)) {
if (mwifiex_parse_mgmt_packet(priv, (u8 *)ieee_hdr,
pkt_len, rx_pd))
return -1;
}
/* Remove address4 */
memmove(skb->data + sizeof(struct ieee80211_hdr_3addr),
skb->data + sizeof(struct ieee80211_hdr),
pkt_len - sizeof(struct ieee80211_hdr));
pkt_len -= ETH_ALEN + sizeof(pkt_len);
rx_pd->rx_pkt_length = cpu_to_le16(pkt_len);
cfg80211_rx_mgmt(&priv->wdev, priv->roc_cfg.chan.center_freq,
CAL_RSSI(rx_pd->snr, rx_pd->nf), skb->data, pkt_len,
0);
return 0;
}
/*
* This function processes the received packet before sending it to the
* kernel.
*
* It extracts the SKB from the received buffer and sends it to kernel.
* In case the received buffer does not contain the data in SKB format,
* the function creates a blank SKB, fills it with the data from the
* received buffer and then sends this new SKB to the kernel.
*/
int mwifiex_recv_packet(struct mwifiex_private *priv, struct sk_buff *skb)
{
struct mwifiex_sta_node *src_node;
struct ethhdr *p_ethhdr;
if (!skb)
return -1;
priv->stats.rx_bytes += skb->len;
priv->stats.rx_packets++;
if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP) {
p_ethhdr = (void *)skb->data;
src_node = mwifiex_get_sta_entry(priv, p_ethhdr->h_source);
if (src_node) {
src_node->stats.last_rx = jiffies;
src_node->stats.rx_bytes += skb->len;
src_node->stats.rx_packets++;
}
}
skb->dev = priv->netdev;
skb->protocol = eth_type_trans(skb, priv->netdev);
skb->ip_summed = CHECKSUM_NONE;
/* This is required only in case of 11n and USB/PCIE as we alloc
* a buffer of 4K only if its 11N (to be able to receive 4K
* AMSDU packets). In case of SD we allocate buffers based
* on the size of packet and hence this is not needed.
*
* Modifying the truesize here as our allocation for each
* skb is 4K but we only receive 2K packets and this cause
* the kernel to start dropping packets in case where
* application has allocated buffer based on 2K size i.e.
* if there a 64K packet received (in IP fragments and
* application allocates 64K to receive this packet but
* this packet would almost double up because we allocate
* each 1.5K fragment in 4K and pass it up. As soon as the
* 64K limit hits kernel will start to drop rest of the
* fragments. Currently we fail the Filesndl-ht.scr script
* for UDP, hence this fix
*/
if ((priv->adapter->iface_type == MWIFIEX_USB ||
priv->adapter->iface_type == MWIFIEX_PCIE) &&
(skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE))
skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE);
if (in_interrupt())
netif_rx(skb);
else
netif_rx_ni(skb);
return 0;
}
/*
* IOCTL completion callback handler.
*
* This function is called when a pending IOCTL is completed.
*
* If work queue support is enabled, the function wakes up the
* corresponding waiting function. Otherwise, it processes the
* IOCTL response and frees the response buffer.
*/
int mwifiex_complete_cmd(struct mwifiex_adapter *adapter,
struct cmd_ctrl_node *cmd_node)
{
mwifiex_dbg(adapter, CMD,
"cmd completed: status=%d\n",
adapter->cmd_wait_q.status);
*(cmd_node->condition) = true;
if (adapter->cmd_wait_q.status == -ETIMEDOUT)
mwifiex_dbg(adapter, ERROR, "cmd timeout\n");
else
wake_up_interruptible(&adapter->cmd_wait_q.wait);
return 0;
}
/* This function will return the pointer to station entry in station list
* table which matches specified mac address.
* This function should be called after acquiring RA list spinlock.
* NULL is returned if station entry is not found in associated STA list.
*/
struct mwifiex_sta_node *
mwifiex_get_sta_entry(struct mwifiex_private *priv, const u8 *mac)
{
struct mwifiex_sta_node *node;
if (!mac)
return NULL;
list_for_each_entry(node, &priv->sta_list, list) {
if (!memcmp(node->mac_addr, mac, ETH_ALEN))
return node;
}
return NULL;
}
/* This function will add a sta_node entry to associated station list
* table with the given mac address.
* If entry exist already, existing entry is returned.
* If received mac address is NULL, NULL is returned.
*/
struct mwifiex_sta_node *
mwifiex_add_sta_entry(struct mwifiex_private *priv, const u8 *mac)
{
struct mwifiex_sta_node *node;
unsigned long flags;
if (!mac)
return NULL;
spin_lock_irqsave(&priv->sta_list_spinlock, flags);
node = mwifiex_get_sta_entry(priv, mac);
if (node)
goto done;
node = kzalloc(sizeof(*node), GFP_ATOMIC);
if (!node)
goto done;
memcpy(node->mac_addr, mac, ETH_ALEN);
list_add_tail(&node->list, &priv->sta_list);
done:
spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
return node;
}
/* This function will search for HT IE in association request IEs
* and set station HT parameters accordingly.
*/
void
mwifiex_set_sta_ht_cap(struct mwifiex_private *priv, const u8 *ies,
int ies_len, struct mwifiex_sta_node *node)
{
struct ieee_types_header *ht_cap_ie;
const struct ieee80211_ht_cap *ht_cap;
if (!ies)
return;
ht_cap_ie = (void *)cfg80211_find_ie(WLAN_EID_HT_CAPABILITY, ies,
ies_len);
if (ht_cap_ie) {
ht_cap = (void *)(ht_cap_ie + 1);
node->is_11n_enabled = 1;
node->max_amsdu = le16_to_cpu(ht_cap->cap_info) &
IEEE80211_HT_CAP_MAX_AMSDU ?
MWIFIEX_TX_DATA_BUF_SIZE_8K :
MWIFIEX_TX_DATA_BUF_SIZE_4K;
} else {
node->is_11n_enabled = 0;
}
return;
}
/* This function will delete a station entry from station list */
void mwifiex_del_sta_entry(struct mwifiex_private *priv, const u8 *mac)
{
struct mwifiex_sta_node *node;
unsigned long flags;
spin_lock_irqsave(&priv->sta_list_spinlock, flags);
node = mwifiex_get_sta_entry(priv, mac);
if (node) {
list_del(&node->list);
kfree(node);
}
spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
return;
}
/* This function will delete all stations from associated station list. */
void mwifiex_del_all_sta_list(struct mwifiex_private *priv)
{
struct mwifiex_sta_node *node, *tmp;
unsigned long flags;
spin_lock_irqsave(&priv->sta_list_spinlock, flags);
list_for_each_entry_safe(node, tmp, &priv->sta_list, list) {
list_del(&node->list);
kfree(node);
}
INIT_LIST_HEAD(&priv->sta_list);
spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
return;
}
/* This function adds histogram data to histogram array*/
void mwifiex_hist_data_add(struct mwifiex_private *priv,
u8 rx_rate, s8 snr, s8 nflr)
{
struct mwifiex_histogram_data *phist_data = priv->hist_data;
if (atomic_read(&phist_data->num_samples) > MWIFIEX_HIST_MAX_SAMPLES)
mwifiex_hist_data_reset(priv);
mwifiex_hist_data_set(priv, rx_rate, snr, nflr);
}
/* function to add histogram record */
void mwifiex_hist_data_set(struct mwifiex_private *priv, u8 rx_rate, s8 snr,
s8 nflr)
{
struct mwifiex_histogram_data *phist_data = priv->hist_data;
atomic_inc(&phist_data->num_samples);
atomic_inc(&phist_data->rx_rate[rx_rate]);
atomic_inc(&phist_data->snr[snr]);
atomic_inc(&phist_data->noise_flr[128 + nflr]);
atomic_inc(&phist_data->sig_str[nflr - snr]);
}
/* function to reset histogram data during init/reset */
void mwifiex_hist_data_reset(struct mwifiex_private *priv)
{
int ix;
struct mwifiex_histogram_data *phist_data = priv->hist_data;
atomic_set(&phist_data->num_samples, 0);
for (ix = 0; ix < MWIFIEX_MAX_AC_RX_RATES; ix++)
atomic_set(&phist_data->rx_rate[ix], 0);
for (ix = 0; ix < MWIFIEX_MAX_SNR; ix++)
atomic_set(&phist_data->snr[ix], 0);
for (ix = 0; ix < MWIFIEX_MAX_NOISE_FLR; ix++)
atomic_set(&phist_data->noise_flr[ix], 0);
for (ix = 0; ix < MWIFIEX_MAX_SIG_STRENGTH; ix++)
atomic_set(&phist_data->sig_str[ix], 0);
}
void *mwifiex_alloc_dma_align_buf(int rx_len, gfp_t flags)
{
struct sk_buff *skb;
int buf_len, pad;
buf_len = rx_len + MWIFIEX_RX_HEADROOM + MWIFIEX_DMA_ALIGN_SZ;
skb = __dev_alloc_skb(buf_len, flags);
if (!skb)
return NULL;
skb_reserve(skb, MWIFIEX_RX_HEADROOM);
pad = MWIFIEX_ALIGN_ADDR(skb->data, MWIFIEX_DMA_ALIGN_SZ) -
(long)skb->data;
skb_reserve(skb, pad);
return skb;
}
EXPORT_SYMBOL_GPL(mwifiex_alloc_dma_align_buf);
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