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linux_dsm_epyc7002/drivers/net/wireless/orinoco/main.c
Markus Elfring 71b9d0aeac orinoco: Delete an unnecessary check before the function call "kfree" 
The kfree() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
2015-02-06 08:50:24 +02:00

2432 lines
63 KiB
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/* main.c - (formerly known as dldwd_cs.c, orinoco_cs.c and orinoco.c)
*
* A driver for Hermes or Prism 2 chipset based PCMCIA wireless
* adaptors, with Lucent/Agere, Intersil or Symbol firmware.
*
* Current maintainers (as of 29 September 2003) are:
* Pavel Roskin <proski AT gnu.org>
* and David Gibson <hermes AT gibson.dropbear.id.au>
*
* (C) Copyright David Gibson, IBM Corporation 2001-2003.
* Copyright (C) 2000 David Gibson, Linuxcare Australia.
* With some help from :
* Copyright (C) 2001 Jean Tourrilhes, HP Labs
* Copyright (C) 2001 Benjamin Herrenschmidt
*
* Based on dummy_cs.c 1.27 2000/06/12 21:27:25
*
* Portions based on wvlan_cs.c 1.0.6, Copyright Andreas Neuhaus <andy
* AT fasta.fh-dortmund.de>
* http://www.stud.fh-dortmund.de/~andy/wvlan/
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License
* at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and
* limitations under the License.
*
* The initial developer of the original code is David A. Hinds
* <dahinds AT users.sourceforge.net>. Portions created by David
* A. Hinds are Copyright (C) 1999 David A. Hinds. All Rights
* Reserved.
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License version 2 (the "GPL"), in
* which case the provisions of the GPL are applicable instead of the
* above. If you wish to allow the use of your version of this file
* only under the terms of the GPL and not to allow others to use your
* version of this file under the MPL, indicate your decision by
* deleting the provisions above and replace them with the notice and
* other provisions required by the GPL. If you do not delete the
* provisions above, a recipient may use your version of this file
* under either the MPL or the GPL. */
/*
* TODO
* o Handle de-encapsulation within network layer, provide 802.11
* headers (patch from Thomas 'Dent' Mirlacher)
* o Fix possible races in SPY handling.
* o Disconnect wireless extensions from fundamental configuration.
* o (maybe) Software WEP support (patch from Stano Meduna).
* o (maybe) Use multiple Tx buffers - driver handling queue
* rather than firmware.
*/
/* Locking and synchronization:
*
* The basic principle is that everything is serialized through a
* single spinlock, priv->lock. The lock is used in user, bh and irq
* context, so when taken outside hardirq context it should always be
* taken with interrupts disabled. The lock protects both the
* hardware and the struct orinoco_private.
*
* Another flag, priv->hw_unavailable indicates that the hardware is
* unavailable for an extended period of time (e.g. suspended, or in
* the middle of a hard reset). This flag is protected by the
* spinlock. All code which touches the hardware should check the
* flag after taking the lock, and if it is set, give up on whatever
* they are doing and drop the lock again. The orinoco_lock()
* function handles this (it unlocks and returns -EBUSY if
* hw_unavailable is non-zero).
*/
#define DRIVER_NAME "orinoco"
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/suspend.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/ieee80211.h>
#include <net/iw_handler.h>
#include <net/cfg80211.h>
#include "hermes_rid.h"
#include "hermes_dld.h"
#include "hw.h"
#include "scan.h"
#include "mic.h"
#include "fw.h"
#include "wext.h"
#include "cfg.h"
#include "main.h"
#include "orinoco.h"
/********************************************************************/
/* Module information */
/********************************************************************/
MODULE_AUTHOR("Pavel Roskin <proski@gnu.org> & "
"David Gibson <hermes@gibson.dropbear.id.au>");
MODULE_DESCRIPTION("Driver for Lucent Orinoco, Prism II based "
"and similar wireless cards");
MODULE_LICENSE("Dual MPL/GPL");
/* Level of debugging. Used in the macros in orinoco.h */
#ifdef ORINOCO_DEBUG
int orinoco_debug = ORINOCO_DEBUG;
EXPORT_SYMBOL(orinoco_debug);
module_param(orinoco_debug, int, 0644);
MODULE_PARM_DESC(orinoco_debug, "Debug level");
#endif
static bool suppress_linkstatus; /* = 0 */
module_param(suppress_linkstatus, bool, 0644);
MODULE_PARM_DESC(suppress_linkstatus, "Don't log link status changes");
static int ignore_disconnect; /* = 0 */
module_param(ignore_disconnect, int, 0644);
MODULE_PARM_DESC(ignore_disconnect,
"Don't report lost link to the network layer");
int force_monitor; /* = 0 */
module_param(force_monitor, int, 0644);
MODULE_PARM_DESC(force_monitor, "Allow monitor mode for all firmware versions");
/********************************************************************/
/* Internal constants */
/********************************************************************/
/* 802.2 LLC/SNAP header used for Ethernet encapsulation over 802.11 */
static const u8 encaps_hdr[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
#define ENCAPS_OVERHEAD (sizeof(encaps_hdr) + 2)
#define ORINOCO_MIN_MTU 256
#define ORINOCO_MAX_MTU (IEEE80211_MAX_DATA_LEN - ENCAPS_OVERHEAD)
#define MAX_IRQLOOPS_PER_IRQ 10
#define MAX_IRQLOOPS_PER_JIFFY (20000 / HZ) /* Based on a guestimate of
* how many events the
* device could
* legitimately generate */
#define DUMMY_FID 0xFFFF
/*#define MAX_MULTICAST(priv) (priv->firmware_type == FIRMWARE_TYPE_AGERE ? \
HERMES_MAX_MULTICAST : 0)*/
#define MAX_MULTICAST(priv) (HERMES_MAX_MULTICAST)
#define ORINOCO_INTEN (HERMES_EV_RX | HERMES_EV_ALLOC \
| HERMES_EV_TX | HERMES_EV_TXEXC \
| HERMES_EV_WTERR | HERMES_EV_INFO \
| HERMES_EV_INFDROP)
/********************************************************************/
/* Data types */
/********************************************************************/
/* Beginning of the Tx descriptor, used in TxExc handling */
struct hermes_txexc_data {
struct hermes_tx_descriptor desc;
__le16 frame_ctl;
__le16 duration_id;
u8 addr1[ETH_ALEN];
} __packed;
/* Rx frame header except compatibility 802.3 header */
struct hermes_rx_descriptor {
/* Control */
__le16 status;
__le32 time;
u8 silence;
u8 signal;
u8 rate;
u8 rxflow;
__le32 reserved;
/* 802.11 header */
__le16 frame_ctl;
__le16 duration_id;
u8 addr1[ETH_ALEN];
u8 addr2[ETH_ALEN];
u8 addr3[ETH_ALEN];
__le16 seq_ctl;
u8 addr4[ETH_ALEN];
/* Data length */
__le16 data_len;
} __packed;
struct orinoco_rx_data {
struct hermes_rx_descriptor *desc;
struct sk_buff *skb;
struct list_head list;
};
struct orinoco_scan_data {
void *buf;
size_t len;
int type;
struct list_head list;
};
/********************************************************************/
/* Function prototypes */
/********************************************************************/
static int __orinoco_set_multicast_list(struct net_device *dev);
static int __orinoco_up(struct orinoco_private *priv);
static int __orinoco_down(struct orinoco_private *priv);
static int __orinoco_commit(struct orinoco_private *priv);
/********************************************************************/
/* Internal helper functions */
/********************************************************************/
void set_port_type(struct orinoco_private *priv)
{
switch (priv->iw_mode) {
case NL80211_IFTYPE_STATION:
priv->port_type = 1;
priv->createibss = 0;
break;
case NL80211_IFTYPE_ADHOC:
if (priv->prefer_port3) {
priv->port_type = 3;
priv->createibss = 0;
} else {
priv->port_type = priv->ibss_port;
priv->createibss = 1;
}
break;
case NL80211_IFTYPE_MONITOR:
priv->port_type = 3;
priv->createibss = 0;
break;
default:
printk(KERN_ERR "%s: Invalid priv->iw_mode in set_port_type()\n",
priv->ndev->name);
}
}
/********************************************************************/
/* Device methods */
/********************************************************************/
int orinoco_open(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
unsigned long flags;
int err;
if (orinoco_lock(priv, &flags) != 0)
return -EBUSY;
err = __orinoco_up(priv);
if (!err)
priv->open = 1;
orinoco_unlock(priv, &flags);
return err;
}
EXPORT_SYMBOL(orinoco_open);
int orinoco_stop(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
int err = 0;
/* We mustn't use orinoco_lock() here, because we need to be
able to close the interface even if hw_unavailable is set
(e.g. as we're released after a PC Card removal) */
orinoco_lock_irq(priv);
priv->open = 0;
err = __orinoco_down(priv);
orinoco_unlock_irq(priv);
return err;
}
EXPORT_SYMBOL(orinoco_stop);
struct net_device_stats *orinoco_get_stats(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
return &priv->stats;
}
EXPORT_SYMBOL(orinoco_get_stats);
void orinoco_set_multicast_list(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
unsigned long flags;
if (orinoco_lock(priv, &flags) != 0) {
printk(KERN_DEBUG "%s: orinoco_set_multicast_list() "
"called when hw_unavailable\n", dev->name);
return;
}
__orinoco_set_multicast_list(dev);
orinoco_unlock(priv, &flags);
}
EXPORT_SYMBOL(orinoco_set_multicast_list);
int orinoco_change_mtu(struct net_device *dev, int new_mtu)
{
struct orinoco_private *priv = ndev_priv(dev);
if ((new_mtu < ORINOCO_MIN_MTU) || (new_mtu > ORINOCO_MAX_MTU))
return -EINVAL;
/* MTU + encapsulation + header length */
if ((new_mtu + ENCAPS_OVERHEAD + sizeof(struct ieee80211_hdr)) >
(priv->nicbuf_size - ETH_HLEN))
return -EINVAL;
dev->mtu = new_mtu;
return 0;
}
EXPORT_SYMBOL(orinoco_change_mtu);
/********************************************************************/
/* Tx path */
/********************************************************************/
/* Add encapsulation and MIC to the existing SKB.
* The main xmit routine will then send the whole lot to the card.
* Need 8 bytes headroom
* Need 8 bytes tailroom
*
* With encapsulated ethernet II frame
* --------
* 803.3 header (14 bytes)
* dst[6]
* -------- src[6]
* 803.3 header (14 bytes) len[2]
* dst[6] 803.2 header (8 bytes)
* src[6] encaps[6]
* len[2] <- leave alone -> len[2]
* -------- -------- <-- 0
* Payload Payload
* ... ...
*
* -------- --------
* MIC (8 bytes)
* --------
*
* returns 0 on success, -ENOMEM on error.
*/
int orinoco_process_xmit_skb(struct sk_buff *skb,
struct net_device *dev,
struct orinoco_private *priv,
int *tx_control,
u8 *mic_buf)
{
struct orinoco_tkip_key *key;
struct ethhdr *eh;
int do_mic;
key = (struct orinoco_tkip_key *) priv->keys[priv->tx_key].key;
do_mic = ((priv->encode_alg == ORINOCO_ALG_TKIP) &&
(key != NULL));
if (do_mic)
*tx_control |= (priv->tx_key << HERMES_MIC_KEY_ID_SHIFT) |
HERMES_TXCTRL_MIC;
eh = (struct ethhdr *)skb->data;
/* Encapsulate Ethernet-II frames */
if (ntohs(eh->h_proto) > ETH_DATA_LEN) { /* Ethernet-II frame */
struct header_struct {
struct ethhdr eth; /* 802.3 header */
u8 encap[6]; /* 802.2 header */
} __packed hdr;
int len = skb->len + sizeof(encaps_hdr) - (2 * ETH_ALEN);
if (skb_headroom(skb) < ENCAPS_OVERHEAD) {
if (net_ratelimit())
printk(KERN_ERR
"%s: Not enough headroom for 802.2 headers %d\n",
dev->name, skb_headroom(skb));
return -ENOMEM;
}
/* Fill in new header */
memcpy(&hdr.eth, eh, 2 * ETH_ALEN);
hdr.eth.h_proto = htons(len);
memcpy(hdr.encap, encaps_hdr, sizeof(encaps_hdr));
/* Make room for the new header, and copy it in */
eh = (struct ethhdr *) skb_push(skb, ENCAPS_OVERHEAD);
memcpy(eh, &hdr, sizeof(hdr));
}
/* Calculate Michael MIC */
if (do_mic) {
size_t len = skb->len - ETH_HLEN;
u8 *mic = &mic_buf[0];
/* Have to write to an even address, so copy the spare
* byte across */
if (skb->len % 2) {
*mic = skb->data[skb->len - 1];
mic++;
}
orinoco_mic(priv->tx_tfm_mic, key->tx_mic,
eh->h_dest, eh->h_source, 0 /* priority */,
skb->data + ETH_HLEN,
len, mic);
}
return 0;
}
EXPORT_SYMBOL(orinoco_process_xmit_skb);
static netdev_tx_t orinoco_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
struct hermes *hw = &priv->hw;
int err = 0;
u16 txfid = priv->txfid;
int tx_control;
unsigned long flags;
u8 mic_buf[MICHAEL_MIC_LEN + 1];
if (!netif_running(dev)) {
printk(KERN_ERR "%s: Tx on stopped device!\n",
dev->name);
return NETDEV_TX_BUSY;
}
if (netif_queue_stopped(dev)) {
printk(KERN_DEBUG "%s: Tx while transmitter busy!\n",
dev->name);
return NETDEV_TX_BUSY;
}
if (orinoco_lock(priv, &flags) != 0) {
printk(KERN_ERR "%s: orinoco_xmit() called while hw_unavailable\n",
dev->name);
return NETDEV_TX_BUSY;
}
if (!netif_carrier_ok(dev) ||
(priv->iw_mode == NL80211_IFTYPE_MONITOR)) {
/* Oops, the firmware hasn't established a connection,
silently drop the packet (this seems to be the
safest approach). */
goto drop;
}
/* Check packet length */
if (skb->len < ETH_HLEN)
goto drop;
tx_control = HERMES_TXCTRL_TX_OK | HERMES_TXCTRL_TX_EX;
err = orinoco_process_xmit_skb(skb, dev, priv, &tx_control,
&mic_buf[0]);
if (err)
goto drop;
if (priv->has_alt_txcntl) {
/* WPA enabled firmwares have tx_cntl at the end of
* the 802.11 header. So write zeroed descriptor and
* 802.11 header at the same time
*/
char desc[HERMES_802_3_OFFSET];
__le16 *txcntl = (__le16 *) &desc[HERMES_TXCNTL2_OFFSET];
memset(&desc, 0, sizeof(desc));
*txcntl = cpu_to_le16(tx_control);
err = hw->ops->bap_pwrite(hw, USER_BAP, &desc, sizeof(desc),
txfid, 0);
if (err) {
if (net_ratelimit())
printk(KERN_ERR "%s: Error %d writing Tx "
"descriptor to BAP\n", dev->name, err);
goto busy;
}
} else {
struct hermes_tx_descriptor desc;
memset(&desc, 0, sizeof(desc));
desc.tx_control = cpu_to_le16(tx_control);
err = hw->ops->bap_pwrite(hw, USER_BAP, &desc, sizeof(desc),
txfid, 0);
if (err) {
if (net_ratelimit())
printk(KERN_ERR "%s: Error %d writing Tx "
"descriptor to BAP\n", dev->name, err);
goto busy;
}
/* Clear the 802.11 header and data length fields - some
* firmwares (e.g. Lucent/Agere 8.xx) appear to get confused
* if this isn't done. */
hermes_clear_words(hw, HERMES_DATA0,
HERMES_802_3_OFFSET - HERMES_802_11_OFFSET);
}
err = hw->ops->bap_pwrite(hw, USER_BAP, skb->data, skb->len,
txfid, HERMES_802_3_OFFSET);
if (err) {
printk(KERN_ERR "%s: Error %d writing packet to BAP\n",
dev->name, err);
goto busy;
}
if (tx_control & HERMES_TXCTRL_MIC) {
size_t offset = HERMES_802_3_OFFSET + skb->len;
size_t len = MICHAEL_MIC_LEN;
if (offset % 2) {
offset--;
len++;
}
err = hw->ops->bap_pwrite(hw, USER_BAP, &mic_buf[0], len,
txfid, offset);
if (err) {
printk(KERN_ERR "%s: Error %d writing MIC to BAP\n",
dev->name, err);
goto busy;
}
}
/* Finally, we actually initiate the send */
netif_stop_queue(dev);
err = hw->ops->cmd_wait(hw, HERMES_CMD_TX | HERMES_CMD_RECL,
txfid, NULL);
if (err) {
netif_start_queue(dev);
if (net_ratelimit())
printk(KERN_ERR "%s: Error %d transmitting packet\n",
dev->name, err);
goto busy;
}
stats->tx_bytes += HERMES_802_3_OFFSET + skb->len;
goto ok;
drop:
stats->tx_errors++;
stats->tx_dropped++;
ok:
orinoco_unlock(priv, &flags);
dev_kfree_skb(skb);
return NETDEV_TX_OK;
busy:
if (err == -EIO)
schedule_work(&priv->reset_work);
orinoco_unlock(priv, &flags);
return NETDEV_TX_BUSY;
}
static void __orinoco_ev_alloc(struct net_device *dev, struct hermes *hw)
{
struct orinoco_private *priv = ndev_priv(dev);
u16 fid = hermes_read_regn(hw, ALLOCFID);
if (fid != priv->txfid) {
if (fid != DUMMY_FID)
printk(KERN_WARNING "%s: Allocate event on unexpected fid (%04X)\n",
dev->name, fid);
return;
}
hermes_write_regn(hw, ALLOCFID, DUMMY_FID);
}
static void __orinoco_ev_tx(struct net_device *dev, struct hermes *hw)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
stats->tx_packets++;
netif_wake_queue(dev);
hermes_write_regn(hw, TXCOMPLFID, DUMMY_FID);
}
static void __orinoco_ev_txexc(struct net_device *dev, struct hermes *hw)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
u16 fid = hermes_read_regn(hw, TXCOMPLFID);
u16 status;
struct hermes_txexc_data hdr;
int err = 0;
if (fid == DUMMY_FID)
return; /* Nothing's really happened */
/* Read part of the frame header - we need status and addr1 */
err = hw->ops->bap_pread(hw, IRQ_BAP, &hdr,
sizeof(struct hermes_txexc_data),
fid, 0);
hermes_write_regn(hw, TXCOMPLFID, DUMMY_FID);
stats->tx_errors++;
if (err) {
printk(KERN_WARNING "%s: Unable to read descriptor on Tx error "
"(FID=%04X error %d)\n",
dev->name, fid, err);
return;
}
DEBUG(1, "%s: Tx error, err %d (FID=%04X)\n", dev->name,
err, fid);
/* We produce a TXDROP event only for retry or lifetime
* exceeded, because that's the only status that really mean
* that this particular node went away.
* Other errors means that *we* screwed up. - Jean II */
status = le16_to_cpu(hdr.desc.status);
if (status & (HERMES_TXSTAT_RETRYERR | HERMES_TXSTAT_AGEDERR)) {
union iwreq_data wrqu;
/* Copy 802.11 dest address.
* We use the 802.11 header because the frame may
* not be 802.3 or may be mangled...
* In Ad-Hoc mode, it will be the node address.
* In managed mode, it will be most likely the AP addr
* User space will figure out how to convert it to
* whatever it needs (IP address or else).
* - Jean II */
memcpy(wrqu.addr.sa_data, hdr.addr1, ETH_ALEN);
wrqu.addr.sa_family = ARPHRD_ETHER;
/* Send event to user space */
wireless_send_event(dev, IWEVTXDROP, &wrqu, NULL);
}
netif_wake_queue(dev);
}
void orinoco_tx_timeout(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
struct hermes *hw = &priv->hw;
printk(KERN_WARNING "%s: Tx timeout! "
"ALLOCFID=%04x, TXCOMPLFID=%04x, EVSTAT=%04x\n",
dev->name, hermes_read_regn(hw, ALLOCFID),
hermes_read_regn(hw, TXCOMPLFID), hermes_read_regn(hw, EVSTAT));
stats->tx_errors++;
schedule_work(&priv->reset_work);
}
EXPORT_SYMBOL(orinoco_tx_timeout);
/********************************************************************/
/* Rx path (data frames) */
/********************************************************************/
/* Does the frame have a SNAP header indicating it should be
* de-encapsulated to Ethernet-II? */
static inline int is_ethersnap(void *_hdr)
{
u8 *hdr = _hdr;
/* We de-encapsulate all packets which, a) have SNAP headers
* (i.e. SSAP=DSAP=0xaa and CTRL=0x3 in the 802.2 LLC header
* and where b) the OUI of the SNAP header is 00:00:00 or
* 00:00:f8 - we need both because different APs appear to use
* different OUIs for some reason */
return (memcmp(hdr, &encaps_hdr, 5) == 0)
&& ((hdr[5] == 0x00) || (hdr[5] == 0xf8));
}
static inline void orinoco_spy_gather(struct net_device *dev, u_char *mac,
int level, int noise)
{
struct iw_quality wstats;
wstats.level = level - 0x95;
wstats.noise = noise - 0x95;
wstats.qual = (level > noise) ? (level - noise) : 0;
wstats.updated = IW_QUAL_ALL_UPDATED | IW_QUAL_DBM;
/* Update spy records */
wireless_spy_update(dev, mac, &wstats);
}
static void orinoco_stat_gather(struct net_device *dev,
struct sk_buff *skb,
struct hermes_rx_descriptor *desc)
{
struct orinoco_private *priv = ndev_priv(dev);
/* Using spy support with lots of Rx packets, like in an
* infrastructure (AP), will really slow down everything, because
* the MAC address must be compared to each entry of the spy list.
* If the user really asks for it (set some address in the
* spy list), we do it, but he will pay the price.
* Note that to get here, you need both WIRELESS_SPY
* compiled in AND some addresses in the list !!!
*/
/* Note : gcc will optimise the whole section away if
* WIRELESS_SPY is not defined... - Jean II */
if (SPY_NUMBER(priv)) {
orinoco_spy_gather(dev, skb_mac_header(skb) + ETH_ALEN,
desc->signal, desc->silence);
}
}
/*
* orinoco_rx_monitor - handle received monitor frames.
*
* Arguments:
* dev network device
* rxfid received FID
* desc rx descriptor of the frame
*
* Call context: interrupt
*/
static void orinoco_rx_monitor(struct net_device *dev, u16 rxfid,
struct hermes_rx_descriptor *desc)
{
u32 hdrlen = 30; /* return full header by default */
u32 datalen = 0;
u16 fc;
int err;
int len;
struct sk_buff *skb;
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
struct hermes *hw = &priv->hw;
len = le16_to_cpu(desc->data_len);
/* Determine the size of the header and the data */
fc = le16_to_cpu(desc->frame_ctl);
switch (fc & IEEE80211_FCTL_FTYPE) {
case IEEE80211_FTYPE_DATA:
if ((fc & IEEE80211_FCTL_TODS)
&& (fc & IEEE80211_FCTL_FROMDS))
hdrlen = 30;
else
hdrlen = 24;
datalen = len;
break;
case IEEE80211_FTYPE_MGMT:
hdrlen = 24;
datalen = len;
break;
case IEEE80211_FTYPE_CTL:
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_PSPOLL:
case IEEE80211_STYPE_RTS:
case IEEE80211_STYPE_CFEND:
case IEEE80211_STYPE_CFENDACK:
hdrlen = 16;
break;
case IEEE80211_STYPE_CTS:
case IEEE80211_STYPE_ACK:
hdrlen = 10;
break;
}
break;
default:
/* Unknown frame type */
break;
}
/* sanity check the length */
if (datalen > IEEE80211_MAX_DATA_LEN + 12) {
printk(KERN_DEBUG "%s: oversized monitor frame, "
"data length = %d\n", dev->name, datalen);
stats->rx_length_errors++;
goto update_stats;
}
skb = dev_alloc_skb(hdrlen + datalen);
if (!skb) {
printk(KERN_WARNING "%s: Cannot allocate skb for monitor frame\n",
dev->name);
goto update_stats;
}
/* Copy the 802.11 header to the skb */
memcpy(skb_put(skb, hdrlen), &(desc->frame_ctl), hdrlen);
skb_reset_mac_header(skb);
/* If any, copy the data from the card to the skb */
if (datalen > 0) {
err = hw->ops->bap_pread(hw, IRQ_BAP, skb_put(skb, datalen),
ALIGN(datalen, 2), rxfid,
HERMES_802_2_OFFSET);
if (err) {
printk(KERN_ERR "%s: error %d reading monitor frame\n",
dev->name, err);
goto drop;
}
}
skb->dev = dev;
skb->ip_summed = CHECKSUM_NONE;
skb->pkt_type = PACKET_OTHERHOST;
skb->protocol = cpu_to_be16(ETH_P_802_2);
stats->rx_packets++;
stats->rx_bytes += skb->len;
netif_rx(skb);
return;
drop:
dev_kfree_skb_irq(skb);
update_stats:
stats->rx_errors++;
stats->rx_dropped++;
}
void __orinoco_ev_rx(struct net_device *dev, struct hermes *hw)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
struct iw_statistics *wstats = &priv->wstats;
struct sk_buff *skb = NULL;
u16 rxfid, status;
int length;
struct hermes_rx_descriptor *desc;
struct orinoco_rx_data *rx_data;
int err;
desc = kmalloc(sizeof(*desc), GFP_ATOMIC);
if (!desc)
goto update_stats;
rxfid = hermes_read_regn(hw, RXFID);
err = hw->ops->bap_pread(hw, IRQ_BAP, desc, sizeof(*desc),
rxfid, 0);
if (err) {
printk(KERN_ERR "%s: error %d reading Rx descriptor. "
"Frame dropped.\n", dev->name, err);
goto update_stats;
}
status = le16_to_cpu(desc->status);
if (status & HERMES_RXSTAT_BADCRC) {
DEBUG(1, "%s: Bad CRC on Rx. Frame dropped.\n",
dev->name);
stats->rx_crc_errors++;
goto update_stats;
}
/* Handle frames in monitor mode */
if (priv->iw_mode == NL80211_IFTYPE_MONITOR) {
orinoco_rx_monitor(dev, rxfid, desc);
goto out;
}
if (status & HERMES_RXSTAT_UNDECRYPTABLE) {
DEBUG(1, "%s: Undecryptable frame on Rx. Frame dropped.\n",
dev->name);
wstats->discard.code++;
goto update_stats;
}
length = le16_to_cpu(desc->data_len);
/* Sanity checks */
if (length < 3) { /* No for even an 802.2 LLC header */
/* At least on Symbol firmware with PCF we get quite a
lot of these legitimately - Poll frames with no
data. */
goto out;
}
if (length > IEEE80211_MAX_DATA_LEN) {
printk(KERN_WARNING "%s: Oversized frame received (%d bytes)\n",
dev->name, length);
stats->rx_length_errors++;
goto update_stats;
}
/* Payload size does not include Michael MIC. Increase payload
* size to read it together with the data. */
if (status & HERMES_RXSTAT_MIC)
length += MICHAEL_MIC_LEN;
/* We need space for the packet data itself, plus an ethernet
header, plus 2 bytes so we can align the IP header on a
32bit boundary, plus 1 byte so we can read in odd length
packets from the card, which has an IO granularity of 16
bits */
skb = dev_alloc_skb(length + ETH_HLEN + 2 + 1);
if (!skb) {
printk(KERN_WARNING "%s: Can't allocate skb for Rx\n",
dev->name);
goto update_stats;
}
/* We'll prepend the header, so reserve space for it. The worst
case is no decapsulation, when 802.3 header is prepended and
nothing is removed. 2 is for aligning the IP header. */
skb_reserve(skb, ETH_HLEN + 2);
err = hw->ops->bap_pread(hw, IRQ_BAP, skb_put(skb, length),
ALIGN(length, 2), rxfid,
HERMES_802_2_OFFSET);
if (err) {
printk(KERN_ERR "%s: error %d reading frame. "
"Frame dropped.\n", dev->name, err);
goto drop;
}
/* Add desc and skb to rx queue */
rx_data = kzalloc(sizeof(*rx_data), GFP_ATOMIC);
if (!rx_data)
goto drop;
rx_data->desc = desc;
rx_data->skb = skb;
list_add_tail(&rx_data->list, &priv->rx_list);
tasklet_schedule(&priv->rx_tasklet);
return;
drop:
dev_kfree_skb_irq(skb);
update_stats:
stats->rx_errors++;
stats->rx_dropped++;
out:
kfree(desc);
}
EXPORT_SYMBOL(__orinoco_ev_rx);
static void orinoco_rx(struct net_device *dev,
struct hermes_rx_descriptor *desc,
struct sk_buff *skb)
{
struct orinoco_private *priv = ndev_priv(dev);
struct net_device_stats *stats = &priv->stats;
u16 status, fc;
int length;
struct ethhdr *hdr;
status = le16_to_cpu(desc->status);
length = le16_to_cpu(desc->data_len);
fc = le16_to_cpu(desc->frame_ctl);
/* Calculate and check MIC */
if (status & HERMES_RXSTAT_MIC) {
struct orinoco_tkip_key *key;
int key_id = ((status & HERMES_RXSTAT_MIC_KEY_ID) >>
HERMES_MIC_KEY_ID_SHIFT);
u8 mic[MICHAEL_MIC_LEN];
u8 *rxmic;
u8 *src = (fc & IEEE80211_FCTL_FROMDS) ?
desc->addr3 : desc->addr2;
/* Extract Michael MIC from payload */
rxmic = skb->data + skb->len - MICHAEL_MIC_LEN;
skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
length -= MICHAEL_MIC_LEN;
key = (struct orinoco_tkip_key *) priv->keys[key_id].key;
if (!key) {
printk(KERN_WARNING "%s: Received encrypted frame from "
"%pM using key %i, but key is not installed\n",
dev->name, src, key_id);
goto drop;
}
orinoco_mic(priv->rx_tfm_mic, key->rx_mic, desc->addr1, src,
0, /* priority or QoS? */
skb->data, skb->len, &mic[0]);
if (memcmp(mic, rxmic,
MICHAEL_MIC_LEN)) {
union iwreq_data wrqu;
struct iw_michaelmicfailure wxmic;
printk(KERN_WARNING "%s: "
"Invalid Michael MIC in data frame from %pM, "
"using key %i\n",
dev->name, src, key_id);
/* TODO: update stats */
/* Notify userspace */
memset(&wxmic, 0, sizeof(wxmic));
wxmic.flags = key_id & IW_MICFAILURE_KEY_ID;
wxmic.flags |= (desc->addr1[0] & 1) ?
IW_MICFAILURE_GROUP : IW_MICFAILURE_PAIRWISE;
wxmic.src_addr.sa_family = ARPHRD_ETHER;
memcpy(wxmic.src_addr.sa_data, src, ETH_ALEN);
(void) orinoco_hw_get_tkip_iv(priv, key_id,
&wxmic.tsc[0]);
memset(&wrqu, 0, sizeof(wrqu));
wrqu.data.length = sizeof(wxmic);
wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu,
(char *) &wxmic);
goto drop;
}
}
/* Handle decapsulation
* In most cases, the firmware tell us about SNAP frames.
* For some reason, the SNAP frames sent by LinkSys APs
* are not properly recognised by most firmwares.
* So, check ourselves */
if (length >= ENCAPS_OVERHEAD &&
(((status & HERMES_RXSTAT_MSGTYPE) == HERMES_RXSTAT_1042) ||
((status & HERMES_RXSTAT_MSGTYPE) == HERMES_RXSTAT_TUNNEL) ||
is_ethersnap(skb->data))) {
/* These indicate a SNAP within 802.2 LLC within
802.11 frame which we'll need to de-encapsulate to
the original EthernetII frame. */
hdr = (struct ethhdr *)skb_push(skb,
ETH_HLEN - ENCAPS_OVERHEAD);
} else {
/* 802.3 frame - prepend 802.3 header as is */
hdr = (struct ethhdr *)skb_push(skb, ETH_HLEN);
hdr->h_proto = htons(length);
}
memcpy(hdr->h_dest, desc->addr1, ETH_ALEN);
if (fc & IEEE80211_FCTL_FROMDS)
memcpy(hdr->h_source, desc->addr3, ETH_ALEN);
else
memcpy(hdr->h_source, desc->addr2, ETH_ALEN);
skb->protocol = eth_type_trans(skb, dev);
skb->ip_summed = CHECKSUM_NONE;
if (fc & IEEE80211_FCTL_TODS)
skb->pkt_type = PACKET_OTHERHOST;
/* Process the wireless stats if needed */
orinoco_stat_gather(dev, skb, desc);
/* Pass the packet to the networking stack */
netif_rx(skb);
stats->rx_packets++;
stats->rx_bytes += length;
return;
drop:
dev_kfree_skb(skb);
stats->rx_errors++;
stats->rx_dropped++;
}
static void orinoco_rx_isr_tasklet(unsigned long data)
{
struct orinoco_private *priv = (struct orinoco_private *) data;
struct net_device *dev = priv->ndev;
struct orinoco_rx_data *rx_data, *temp;
struct hermes_rx_descriptor *desc;
struct sk_buff *skb;
unsigned long flags;
/* orinoco_rx requires the driver lock, and we also need to
* protect priv->rx_list, so just hold the lock over the
* lot.
*
* If orinoco_lock fails, we've unplugged the card. In this
* case just abort. */
if (orinoco_lock(priv, &flags) != 0)
return;
/* extract desc and skb from queue */
list_for_each_entry_safe(rx_data, temp, &priv->rx_list, list) {
desc = rx_data->desc;
skb = rx_data->skb;
list_del(&rx_data->list);
kfree(rx_data);
orinoco_rx(dev, desc, skb);
kfree(desc);
}
orinoco_unlock(priv, &flags);
}
/********************************************************************/
/* Rx path (info frames) */
/********************************************************************/
static void print_linkstatus(struct net_device *dev, u16 status)
{
char *s;
if (suppress_linkstatus)
return;
switch (status) {
case HERMES_LINKSTATUS_NOT_CONNECTED:
s = "Not Connected";
break;
case HERMES_LINKSTATUS_CONNECTED:
s = "Connected";
break;
case HERMES_LINKSTATUS_DISCONNECTED:
s = "Disconnected";
break;
case HERMES_LINKSTATUS_AP_CHANGE:
s = "AP Changed";
break;
case HERMES_LINKSTATUS_AP_OUT_OF_RANGE:
s = "AP Out of Range";
break;
case HERMES_LINKSTATUS_AP_IN_RANGE:
s = "AP In Range";
break;
case HERMES_LINKSTATUS_ASSOC_FAILED:
s = "Association Failed";
break;
default:
s = "UNKNOWN";
}
printk(KERN_DEBUG "%s: New link status: %s (%04x)\n",
dev->name, s, status);
}
/* Search scan results for requested BSSID, join it if found */
static void orinoco_join_ap(struct work_struct *work)
{
struct orinoco_private *priv =
container_of(work, struct orinoco_private, join_work);
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int err;
unsigned long flags;
struct join_req {
u8 bssid[ETH_ALEN];
__le16 channel;
} __packed req;
const int atom_len = offsetof(struct prism2_scan_apinfo, atim);
struct prism2_scan_apinfo *atom = NULL;
int offset = 4;
int found = 0;
u8 *buf;
u16 len;
/* Allocate buffer for scan results */
buf = kmalloc(MAX_SCAN_LEN, GFP_KERNEL);
if (!buf)
return;
if (orinoco_lock(priv, &flags) != 0)
goto fail_lock;
/* Sanity checks in case user changed something in the meantime */
if (!priv->bssid_fixed)
goto out;
if (strlen(priv->desired_essid) == 0)
goto out;
/* Read scan results from the firmware */
err = hw->ops->read_ltv(hw, USER_BAP,
HERMES_RID_SCANRESULTSTABLE,
MAX_SCAN_LEN, &len, buf);
if (err) {
printk(KERN_ERR "%s: Cannot read scan results\n",
dev->name);
goto out;
}
len = HERMES_RECLEN_TO_BYTES(len);
/* Go through the scan results looking for the channel of the AP
* we were requested to join */
for (; offset + atom_len <= len; offset += atom_len) {
atom = (struct prism2_scan_apinfo *) (buf + offset);
if (memcmp(&atom->bssid, priv->desired_bssid, ETH_ALEN) == 0) {
found = 1;
break;
}
}
if (!found) {
DEBUG(1, "%s: Requested AP not found in scan results\n",
dev->name);
goto out;
}
memcpy(req.bssid, priv->desired_bssid, ETH_ALEN);
req.channel = atom->channel; /* both are little-endian */
err = HERMES_WRITE_RECORD(hw, USER_BAP, HERMES_RID_CNFJOINREQUEST,
&req);
if (err)
printk(KERN_ERR "%s: Error issuing join request\n", dev->name);
out:
orinoco_unlock(priv, &flags);
fail_lock:
kfree(buf);
}
/* Send new BSSID to userspace */
static void orinoco_send_bssid_wevent(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
union iwreq_data wrqu;
int err;
err = hw->ops->read_ltv(hw, USER_BAP, HERMES_RID_CURRENTBSSID,
ETH_ALEN, NULL, wrqu.ap_addr.sa_data);
if (err != 0)
return;
wrqu.ap_addr.sa_family = ARPHRD_ETHER;
/* Send event to user space */
wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
}
static void orinoco_send_assocreqie_wevent(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
union iwreq_data wrqu;
int err;
u8 buf[88];
u8 *ie;
if (!priv->has_wpa)
return;
err = hw->ops->read_ltv(hw, USER_BAP, HERMES_RID_CURRENT_ASSOC_REQ_INFO,
sizeof(buf), NULL, &buf);
if (err != 0)
return;
ie = orinoco_get_wpa_ie(buf, sizeof(buf));
if (ie) {
int rem = sizeof(buf) - (ie - &buf[0]);
wrqu.data.length = ie[1] + 2;
if (wrqu.data.length > rem)
wrqu.data.length = rem;
if (wrqu.data.length)
/* Send event to user space */
wireless_send_event(dev, IWEVASSOCREQIE, &wrqu, ie);
}
}
static void orinoco_send_assocrespie_wevent(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
union iwreq_data wrqu;
int err;
u8 buf[88]; /* TODO: verify max size or IW_GENERIC_IE_MAX */
u8 *ie;
if (!priv->has_wpa)
return;
err = hw->ops->read_ltv(hw, USER_BAP,
HERMES_RID_CURRENT_ASSOC_RESP_INFO,
sizeof(buf), NULL, &buf);
if (err != 0)
return;
ie = orinoco_get_wpa_ie(buf, sizeof(buf));
if (ie) {
int rem = sizeof(buf) - (ie - &buf[0]);
wrqu.data.length = ie[1] + 2;
if (wrqu.data.length > rem)
wrqu.data.length = rem;
if (wrqu.data.length)
/* Send event to user space */
wireless_send_event(dev, IWEVASSOCRESPIE, &wrqu, ie);
}
}
static void orinoco_send_wevents(struct work_struct *work)
{
struct orinoco_private *priv =
container_of(work, struct orinoco_private, wevent_work);
unsigned long flags;
if (orinoco_lock(priv, &flags) != 0)
return;
orinoco_send_assocreqie_wevent(priv);
orinoco_send_assocrespie_wevent(priv);
orinoco_send_bssid_wevent(priv);
orinoco_unlock(priv, &flags);
}
static void qbuf_scan(struct orinoco_private *priv, void *buf,
int len, int type)
{
struct orinoco_scan_data *sd;
unsigned long flags;
sd = kmalloc(sizeof(*sd), GFP_ATOMIC);
if (!sd)
return;
sd->buf = buf;
sd->len = len;
sd->type = type;
spin_lock_irqsave(&priv->scan_lock, flags);
list_add_tail(&sd->list, &priv->scan_list);
spin_unlock_irqrestore(&priv->scan_lock, flags);
schedule_work(&priv->process_scan);
}
static void qabort_scan(struct orinoco_private *priv)
{
struct orinoco_scan_data *sd;
unsigned long flags;
sd = kmalloc(sizeof(*sd), GFP_ATOMIC);
if (!sd)
return;
sd->len = -1; /* Abort */
spin_lock_irqsave(&priv->scan_lock, flags);
list_add_tail(&sd->list, &priv->scan_list);
spin_unlock_irqrestore(&priv->scan_lock, flags);
schedule_work(&priv->process_scan);
}
static void orinoco_process_scan_results(struct work_struct *work)
{
struct orinoco_private *priv =
container_of(work, struct orinoco_private, process_scan);
struct orinoco_scan_data *sd, *temp;
unsigned long flags;
void *buf;
int len;
int type;
spin_lock_irqsave(&priv->scan_lock, flags);
list_for_each_entry_safe(sd, temp, &priv->scan_list, list) {
buf = sd->buf;
len = sd->len;
type = sd->type;
list_del(&sd->list);
spin_unlock_irqrestore(&priv->scan_lock, flags);
kfree(sd);
if (len > 0) {
if (type == HERMES_INQ_CHANNELINFO)
orinoco_add_extscan_result(priv, buf, len);
else
orinoco_add_hostscan_results(priv, buf, len);
kfree(buf);
} else {
/* Either abort or complete the scan */
orinoco_scan_done(priv, (len < 0));
}
spin_lock_irqsave(&priv->scan_lock, flags);
}
spin_unlock_irqrestore(&priv->scan_lock, flags);
}
void __orinoco_ev_info(struct net_device *dev, struct hermes *hw)
{
struct orinoco_private *priv = ndev_priv(dev);
u16 infofid;
struct {
__le16 len;
__le16 type;
} __packed info;
int len, type;
int err;
/* This is an answer to an INQUIRE command that we did earlier,
* or an information "event" generated by the card
* The controller return to us a pseudo frame containing
* the information in question - Jean II */
infofid = hermes_read_regn(hw, INFOFID);
/* Read the info frame header - don't try too hard */
err = hw->ops->bap_pread(hw, IRQ_BAP, &info, sizeof(info),
infofid, 0);
if (err) {
printk(KERN_ERR "%s: error %d reading info frame. "
"Frame dropped.\n", dev->name, err);
return;
}
len = HERMES_RECLEN_TO_BYTES(le16_to_cpu(info.len));
type = le16_to_cpu(info.type);
switch (type) {
case HERMES_INQ_TALLIES: {
struct hermes_tallies_frame tallies;
struct iw_statistics *wstats = &priv->wstats;
if (len > sizeof(tallies)) {
printk(KERN_WARNING "%s: Tallies frame too long (%d bytes)\n",
dev->name, len);
len = sizeof(tallies);
}
err = hw->ops->bap_pread(hw, IRQ_BAP, &tallies, len,
infofid, sizeof(info));
if (err)
break;
/* Increment our various counters */
/* wstats->discard.nwid - no wrong BSSID stuff */
wstats->discard.code +=
le16_to_cpu(tallies.RxWEPUndecryptable);
if (len == sizeof(tallies))
wstats->discard.code +=
le16_to_cpu(tallies.RxDiscards_WEPICVError) +
le16_to_cpu(tallies.RxDiscards_WEPExcluded);
wstats->discard.misc +=
le16_to_cpu(tallies.TxDiscardsWrongSA);
wstats->discard.fragment +=
le16_to_cpu(tallies.RxMsgInBadMsgFragments);
wstats->discard.retries +=
le16_to_cpu(tallies.TxRetryLimitExceeded);
/* wstats->miss.beacon - no match */
}
break;
case HERMES_INQ_LINKSTATUS: {
struct hermes_linkstatus linkstatus;
u16 newstatus;
int connected;
if (priv->iw_mode == NL80211_IFTYPE_MONITOR)
break;
if (len != sizeof(linkstatus)) {
printk(KERN_WARNING "%s: Unexpected size for linkstatus frame (%d bytes)\n",
dev->name, len);
break;
}
err = hw->ops->bap_pread(hw, IRQ_BAP, &linkstatus, len,
infofid, sizeof(info));
if (err)
break;
newstatus = le16_to_cpu(linkstatus.linkstatus);
/* Symbol firmware uses "out of range" to signal that
* the hostscan frame can be requested. */
if (newstatus == HERMES_LINKSTATUS_AP_OUT_OF_RANGE &&
priv->firmware_type == FIRMWARE_TYPE_SYMBOL &&
priv->has_hostscan && priv->scan_request) {
hermes_inquire(hw, HERMES_INQ_HOSTSCAN_SYMBOL);
break;
}
connected = (newstatus == HERMES_LINKSTATUS_CONNECTED)
|| (newstatus == HERMES_LINKSTATUS_AP_CHANGE)
|| (newstatus == HERMES_LINKSTATUS_AP_IN_RANGE);
if (connected)
netif_carrier_on(dev);
else if (!ignore_disconnect)
netif_carrier_off(dev);
if (newstatus != priv->last_linkstatus) {
priv->last_linkstatus = newstatus;
print_linkstatus(dev, newstatus);
/* The info frame contains only one word which is the
* status (see hermes.h). The status is pretty boring
* in itself, that's why we export the new BSSID...
* Jean II */
schedule_work(&priv->wevent_work);
}
}
break;
case HERMES_INQ_SCAN:
if (!priv->scan_request && priv->bssid_fixed &&
priv->firmware_type == FIRMWARE_TYPE_INTERSIL) {
schedule_work(&priv->join_work);
break;
}
/* fall through */
case HERMES_INQ_HOSTSCAN:
case HERMES_INQ_HOSTSCAN_SYMBOL: {
/* Result of a scanning. Contains information about
* cells in the vicinity - Jean II */
unsigned char *buf;
/* Sanity check */
if (len > 4096) {
printk(KERN_WARNING "%s: Scan results too large (%d bytes)\n",
dev->name, len);
qabort_scan(priv);
break;
}
/* Allocate buffer for results */
buf = kmalloc(len, GFP_ATOMIC);
if (buf == NULL) {
/* No memory, so can't printk()... */
qabort_scan(priv);
break;
}
/* Read scan data */
err = hw->ops->bap_pread(hw, IRQ_BAP, (void *) buf, len,
infofid, sizeof(info));
if (err) {
kfree(buf);
qabort_scan(priv);
break;
}
#ifdef ORINOCO_DEBUG
{
int i;
printk(KERN_DEBUG "Scan result [%02X", buf[0]);
for (i = 1; i < (len * 2); i++)
printk(":%02X", buf[i]);
printk("]\n");
}
#endif /* ORINOCO_DEBUG */
qbuf_scan(priv, buf, len, type);
}
break;
case HERMES_INQ_CHANNELINFO:
{
struct agere_ext_scan_info *bss;
if (!priv->scan_request) {
printk(KERN_DEBUG "%s: Got chaninfo without scan, "
"len=%d\n", dev->name, len);
break;
}
/* An empty result indicates that the scan is complete */
if (len == 0) {
qbuf_scan(priv, NULL, len, type);
break;
}
/* Sanity check */
else if (len < (offsetof(struct agere_ext_scan_info,
data) + 2)) {
/* Drop this result now so we don't have to
* keep checking later */
printk(KERN_WARNING
"%s: Ext scan results too short (%d bytes)\n",
dev->name, len);
break;
}
bss = kmalloc(len, GFP_ATOMIC);
if (bss == NULL)
break;
/* Read scan data */
err = hw->ops->bap_pread(hw, IRQ_BAP, (void *) bss, len,
infofid, sizeof(info));
if (err)
kfree(bss);
else
qbuf_scan(priv, bss, len, type);
break;
}
case HERMES_INQ_SEC_STAT_AGERE:
/* Security status (Agere specific) */
/* Ignore this frame for now */
if (priv->firmware_type == FIRMWARE_TYPE_AGERE)
break;
/* fall through */
default:
printk(KERN_DEBUG "%s: Unknown information frame received: "
"type 0x%04x, length %d\n", dev->name, type, len);
/* We don't actually do anything about it */
break;
}
}
EXPORT_SYMBOL(__orinoco_ev_info);
static void __orinoco_ev_infdrop(struct net_device *dev, struct hermes *hw)
{
if (net_ratelimit())
printk(KERN_DEBUG "%s: Information frame lost.\n", dev->name);
}
/********************************************************************/
/* Internal hardware control routines */
/********************************************************************/
static int __orinoco_up(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int err;
netif_carrier_off(dev); /* just to make sure */
err = __orinoco_commit(priv);
if (err) {
printk(KERN_ERR "%s: Error %d configuring card\n",
dev->name, err);
return err;
}
/* Fire things up again */
hermes_set_irqmask(hw, ORINOCO_INTEN);
err = hermes_enable_port(hw, 0);
if (err) {
printk(KERN_ERR "%s: Error %d enabling MAC port\n",
dev->name, err);
return err;
}
netif_start_queue(dev);
return 0;
}
static int __orinoco_down(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int err;
netif_stop_queue(dev);
if (!priv->hw_unavailable) {
if (!priv->broken_disableport) {
err = hermes_disable_port(hw, 0);
if (err) {
/* Some firmwares (e.g. Intersil 1.3.x) seem
* to have problems disabling the port, oh
* well, too bad. */
printk(KERN_WARNING "%s: Error %d disabling MAC port\n",
dev->name, err);
priv->broken_disableport = 1;
}
}
hermes_set_irqmask(hw, 0);
hermes_write_regn(hw, EVACK, 0xffff);
}
orinoco_scan_done(priv, true);
/* firmware will have to reassociate */
netif_carrier_off(dev);
priv->last_linkstatus = 0xffff;
return 0;
}
static int orinoco_reinit_firmware(struct orinoco_private *priv)
{
struct hermes *hw = &priv->hw;
int err;
err = hw->ops->init(hw);
if (priv->do_fw_download && !err) {
err = orinoco_download(priv);
if (err)
priv->do_fw_download = 0;
}
if (!err)
err = orinoco_hw_allocate_fid(priv);
return err;
}
static int
__orinoco_set_multicast_list(struct net_device *dev)
{
struct orinoco_private *priv = ndev_priv(dev);
int err = 0;
int promisc, mc_count;
/* The Hermes doesn't seem to have an allmulti mode, so we go
* into promiscuous mode and let the upper levels deal. */
if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
(netdev_mc_count(dev) > MAX_MULTICAST(priv))) {
promisc = 1;
mc_count = 0;
} else {
promisc = 0;
mc_count = netdev_mc_count(dev);
}
err = __orinoco_hw_set_multicast_list(priv, dev, mc_count, promisc);
return err;
}
/* This must be called from user context, without locks held - use
* schedule_work() */
void orinoco_reset(struct work_struct *work)
{
struct orinoco_private *priv =
container_of(work, struct orinoco_private, reset_work);
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int err;
unsigned long flags;
if (orinoco_lock(priv, &flags) != 0)
/* When the hardware becomes available again, whatever
* detects that is responsible for re-initializing
* it. So no need for anything further */
return;
netif_stop_queue(dev);
/* Shut off interrupts. Depending on what state the hardware
* is in, this might not work, but we'll try anyway */
hermes_set_irqmask(hw, 0);
hermes_write_regn(hw, EVACK, 0xffff);
priv->hw_unavailable++;
priv->last_linkstatus = 0xffff; /* firmware will have to reassociate */
netif_carrier_off(dev);
orinoco_unlock(priv, &flags);
/* Scanning support: Notify scan cancellation */
orinoco_scan_done(priv, true);
if (priv->hard_reset) {
err = (*priv->hard_reset)(priv);
if (err) {
printk(KERN_ERR "%s: orinoco_reset: Error %d "
"performing hard reset\n", dev->name, err);
goto disable;
}
}
err = orinoco_reinit_firmware(priv);
if (err) {
printk(KERN_ERR "%s: orinoco_reset: Error %d re-initializing firmware\n",
dev->name, err);
goto disable;
}
/* This has to be called from user context */
orinoco_lock_irq(priv);
priv->hw_unavailable--;
/* priv->open or priv->hw_unavailable might have changed while
* we dropped the lock */
if (priv->open && (!priv->hw_unavailable)) {
err = __orinoco_up(priv);
if (err) {
printk(KERN_ERR "%s: orinoco_reset: Error %d reenabling card\n",
dev->name, err);
} else
dev->trans_start = jiffies;
}
orinoco_unlock_irq(priv);
return;
disable:
hermes_set_irqmask(hw, 0);
netif_device_detach(dev);
printk(KERN_ERR "%s: Device has been disabled!\n", dev->name);
}
static int __orinoco_commit(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
int err = 0;
/* If we've called commit, we are reconfiguring or bringing the
* interface up. Maintaining countermeasures across this would
* be confusing, so note that we've disabled them. The port will
* be enabled later in orinoco_commit or __orinoco_up. */
priv->tkip_cm_active = 0;
err = orinoco_hw_program_rids(priv);
/* FIXME: what about netif_tx_lock */
(void) __orinoco_set_multicast_list(dev);
return err;
}
/* Ensures configuration changes are applied. May result in a reset.
* The caller should hold priv->lock
*/
int orinoco_commit(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int err;
if (priv->broken_disableport) {
schedule_work(&priv->reset_work);
return 0;
}
err = hermes_disable_port(hw, 0);
if (err) {
printk(KERN_WARNING "%s: Unable to disable port "
"while reconfiguring card\n", dev->name);
priv->broken_disableport = 1;
goto out;
}
err = __orinoco_commit(priv);
if (err) {
printk(KERN_WARNING "%s: Unable to reconfigure card\n",
dev->name);
goto out;
}
err = hermes_enable_port(hw, 0);
if (err) {
printk(KERN_WARNING "%s: Unable to enable port while reconfiguring card\n",
dev->name);
goto out;
}
out:
if (err) {
printk(KERN_WARNING "%s: Resetting instead...\n", dev->name);
schedule_work(&priv->reset_work);
err = 0;
}
return err;
}
/********************************************************************/
/* Interrupt handler */
/********************************************************************/
static void __orinoco_ev_tick(struct net_device *dev, struct hermes *hw)
{
printk(KERN_DEBUG "%s: TICK\n", dev->name);
}
static void __orinoco_ev_wterr(struct net_device *dev, struct hermes *hw)
{
/* This seems to happen a fair bit under load, but ignoring it
seems to work fine...*/
printk(KERN_DEBUG "%s: MAC controller error (WTERR). Ignoring.\n",
dev->name);
}
irqreturn_t orinoco_interrupt(int irq, void *dev_id)
{
struct orinoco_private *priv = dev_id;
struct net_device *dev = priv->ndev;
struct hermes *hw = &priv->hw;
int count = MAX_IRQLOOPS_PER_IRQ;
u16 evstat, events;
/* These are used to detect a runaway interrupt situation.
*
* If we get more than MAX_IRQLOOPS_PER_JIFFY iterations in a jiffy,
* we panic and shut down the hardware
*/
/* jiffies value the last time we were called */
static int last_irq_jiffy; /* = 0 */
static int loops_this_jiffy; /* = 0 */
unsigned long flags;
if (orinoco_lock(priv, &flags) != 0) {
/* If hw is unavailable - we don't know if the irq was
* for us or not */
return IRQ_HANDLED;
}
evstat = hermes_read_regn(hw, EVSTAT);
events = evstat & hw->inten;
if (!events) {
orinoco_unlock(priv, &flags);
return IRQ_NONE;
}
if (jiffies != last_irq_jiffy)
loops_this_jiffy = 0;
last_irq_jiffy = jiffies;
while (events && count--) {
if (++loops_this_jiffy > MAX_IRQLOOPS_PER_JIFFY) {
printk(KERN_WARNING "%s: IRQ handler is looping too "
"much! Resetting.\n", dev->name);
/* Disable interrupts for now */
hermes_set_irqmask(hw, 0);
schedule_work(&priv->reset_work);
break;
}
/* Check the card hasn't been removed */
if (!hermes_present(hw)) {
DEBUG(0, "orinoco_interrupt(): card removed\n");
break;
}
if (events & HERMES_EV_TICK)
__orinoco_ev_tick(dev, hw);
if (events & HERMES_EV_WTERR)
__orinoco_ev_wterr(dev, hw);
if (events & HERMES_EV_INFDROP)
__orinoco_ev_infdrop(dev, hw);
if (events & HERMES_EV_INFO)
__orinoco_ev_info(dev, hw);
if (events & HERMES_EV_RX)
__orinoco_ev_rx(dev, hw);
if (events & HERMES_EV_TXEXC)
__orinoco_ev_txexc(dev, hw);
if (events & HERMES_EV_TX)
__orinoco_ev_tx(dev, hw);
if (events & HERMES_EV_ALLOC)
__orinoco_ev_alloc(dev, hw);
hermes_write_regn(hw, EVACK, evstat);
evstat = hermes_read_regn(hw, EVSTAT);
events = evstat & hw->inten;
}
orinoco_unlock(priv, &flags);
return IRQ_HANDLED;
}
EXPORT_SYMBOL(orinoco_interrupt);
/********************************************************************/
/* Power management */
/********************************************************************/
#if defined(CONFIG_PM_SLEEP) && !defined(CONFIG_HERMES_CACHE_FW_ON_INIT)
static int orinoco_pm_notifier(struct notifier_block *notifier,
unsigned long pm_event,
void *unused)
{
struct orinoco_private *priv = container_of(notifier,
struct orinoco_private,
pm_notifier);
/* All we need to do is cache the firmware before suspend, and
* release it when we come out.
*
* Only need to do this if we're downloading firmware. */
if (!priv->do_fw_download)
return NOTIFY_DONE;
switch (pm_event) {
case PM_HIBERNATION_PREPARE:
case PM_SUSPEND_PREPARE:
orinoco_cache_fw(priv, 0);
break;
case PM_POST_RESTORE:
/* Restore from hibernation failed. We need to clean
* up in exactly the same way, so fall through. */
case PM_POST_HIBERNATION:
case PM_POST_SUSPEND:
orinoco_uncache_fw(priv);
break;
case PM_RESTORE_PREPARE:
default:
break;
}
return NOTIFY_DONE;
}
static void orinoco_register_pm_notifier(struct orinoco_private *priv)
{
priv->pm_notifier.notifier_call = orinoco_pm_notifier;
register_pm_notifier(&priv->pm_notifier);
}
static void orinoco_unregister_pm_notifier(struct orinoco_private *priv)
{
unregister_pm_notifier(&priv->pm_notifier);
}
#else /* !PM_SLEEP || HERMES_CACHE_FW_ON_INIT */
#define orinoco_register_pm_notifier(priv) do { } while (0)
#define orinoco_unregister_pm_notifier(priv) do { } while (0)
#endif
/********************************************************************/
/* Initialization */
/********************************************************************/
int orinoco_init(struct orinoco_private *priv)
{
struct device *dev = priv->dev;
struct wiphy *wiphy = priv_to_wiphy(priv);
struct hermes *hw = &priv->hw;
int err = 0;
/* No need to lock, the hw_unavailable flag is already set in
* alloc_orinocodev() */
priv->nicbuf_size = IEEE80211_MAX_FRAME_LEN + ETH_HLEN;
/* Initialize the firmware */
err = hw->ops->init(hw);
if (err != 0) {
dev_err(dev, "Failed to initialize firmware (err = %d)\n",
err);
goto out;
}
err = determine_fw_capabilities(priv, wiphy->fw_version,
sizeof(wiphy->fw_version),
&wiphy->hw_version);
if (err != 0) {
dev_err(dev, "Incompatible firmware, aborting\n");
goto out;
}
if (priv->do_fw_download) {
#ifdef CONFIG_HERMES_CACHE_FW_ON_INIT
orinoco_cache_fw(priv, 0);
#endif
err = orinoco_download(priv);
if (err)
priv->do_fw_download = 0;
/* Check firmware version again */
err = determine_fw_capabilities(priv, wiphy->fw_version,
sizeof(wiphy->fw_version),
&wiphy->hw_version);
if (err != 0) {
dev_err(dev, "Incompatible firmware, aborting\n");
goto out;
}
}
if (priv->has_port3)
dev_info(dev, "Ad-hoc demo mode supported\n");
if (priv->has_ibss)
dev_info(dev, "IEEE standard IBSS ad-hoc mode supported\n");
if (priv->has_wep)
dev_info(dev, "WEP supported, %s-bit key\n",
priv->has_big_wep ? "104" : "40");
if (priv->has_wpa) {
dev_info(dev, "WPA-PSK supported\n");
if (orinoco_mic_init(priv)) {
dev_err(dev, "Failed to setup MIC crypto algorithm. "
"Disabling WPA support\n");
priv->has_wpa = 0;
}
}
err = orinoco_hw_read_card_settings(priv, wiphy->perm_addr);
if (err)
goto out;
err = orinoco_hw_allocate_fid(priv);
if (err) {
dev_err(dev, "Failed to allocate NIC buffer!\n");
goto out;
}
/* Set up the default configuration */
priv->iw_mode = NL80211_IFTYPE_STATION;
/* By default use IEEE/IBSS ad-hoc mode if we have it */
priv->prefer_port3 = priv->has_port3 && (!priv->has_ibss);
set_port_type(priv);
priv->channel = 0; /* use firmware default */
priv->promiscuous = 0;
priv->encode_alg = ORINOCO_ALG_NONE;
priv->tx_key = 0;
priv->wpa_enabled = 0;
priv->tkip_cm_active = 0;
priv->key_mgmt = 0;
priv->wpa_ie_len = 0;
priv->wpa_ie = NULL;
if (orinoco_wiphy_register(wiphy)) {
err = -ENODEV;
goto out;
}
/* Make the hardware available, as long as it hasn't been
* removed elsewhere (e.g. by PCMCIA hot unplug) */
orinoco_lock_irq(priv);
priv->hw_unavailable--;
orinoco_unlock_irq(priv);
dev_dbg(dev, "Ready\n");
out:
return err;
}
EXPORT_SYMBOL(orinoco_init);
static const struct net_device_ops orinoco_netdev_ops = {
.ndo_open = orinoco_open,
.ndo_stop = orinoco_stop,
.ndo_start_xmit = orinoco_xmit,
.ndo_set_rx_mode = orinoco_set_multicast_list,
.ndo_change_mtu = orinoco_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
.ndo_tx_timeout = orinoco_tx_timeout,
.ndo_get_stats = orinoco_get_stats,
};
/* Allocate private data.
*
* This driver has a number of structures associated with it
* netdev - Net device structure for each network interface
* wiphy - structure associated with wireless phy
* wireless_dev (wdev) - structure for each wireless interface
* hw - structure for hermes chip info
* card - card specific structure for use by the card driver
* (airport, orinoco_cs)
* priv - orinoco private data
* device - generic linux device structure
*
* +---------+ +---------+
* | wiphy | | netdev |
* | +-------+ | +-------+
* | | priv | | | wdev |
* | | +-----+ +-+-------+
* | | | hw |
* | +-+-----+
* | | card |
* +-+-------+
*
* priv has a link to netdev and device
* wdev has a link to wiphy
*/
struct orinoco_private
*alloc_orinocodev(int sizeof_card,
struct device *device,
int (*hard_reset)(struct orinoco_private *),
int (*stop_fw)(struct orinoco_private *, int))
{
struct orinoco_private *priv;
struct wiphy *wiphy;
/* allocate wiphy
* NOTE: We only support a single virtual interface
* but this may change when monitor mode is added
*/
wiphy = wiphy_new(&orinoco_cfg_ops,
sizeof(struct orinoco_private) + sizeof_card);
if (!wiphy)
return NULL;
priv = wiphy_priv(wiphy);
priv->dev = device;
if (sizeof_card)
priv->card = (void *)((unsigned long)priv
+ sizeof(struct orinoco_private));
else
priv->card = NULL;
orinoco_wiphy_init(wiphy);
#ifdef WIRELESS_SPY
priv->wireless_data.spy_data = &priv->spy_data;
#endif
/* Set up default callbacks */
priv->hard_reset = hard_reset;
priv->stop_fw = stop_fw;
spin_lock_init(&priv->lock);
priv->open = 0;
priv->hw_unavailable = 1; /* orinoco_init() must clear this
* before anything else touches the
* hardware */
INIT_WORK(&priv->reset_work, orinoco_reset);
INIT_WORK(&priv->join_work, orinoco_join_ap);
INIT_WORK(&priv->wevent_work, orinoco_send_wevents);
INIT_LIST_HEAD(&priv->rx_list);
tasklet_init(&priv->rx_tasklet, orinoco_rx_isr_tasklet,
(unsigned long) priv);
spin_lock_init(&priv->scan_lock);
INIT_LIST_HEAD(&priv->scan_list);
INIT_WORK(&priv->process_scan, orinoco_process_scan_results);
priv->last_linkstatus = 0xffff;
#if defined(CONFIG_HERMES_CACHE_FW_ON_INIT) || defined(CONFIG_PM_SLEEP)
priv->cached_pri_fw = NULL;
priv->cached_fw = NULL;
#endif
/* Register PM notifiers */
orinoco_register_pm_notifier(priv);
return priv;
}
EXPORT_SYMBOL(alloc_orinocodev);
/* We can only support a single interface. We provide a separate
* function to set it up to distinguish between hardware
* initialisation and interface setup.
*
* The base_addr and irq parameters are passed on to netdev for use
* with SIOCGIFMAP.
*/
int orinoco_if_add(struct orinoco_private *priv,
unsigned long base_addr,
unsigned int irq,
const struct net_device_ops *ops)
{
struct wiphy *wiphy = priv_to_wiphy(priv);
struct wireless_dev *wdev;
struct net_device *dev;
int ret;
dev = alloc_etherdev(sizeof(struct wireless_dev));
if (!dev)
return -ENOMEM;
/* Initialise wireless_dev */
wdev = netdev_priv(dev);
wdev->wiphy = wiphy;
wdev->iftype = NL80211_IFTYPE_STATION;
/* Setup / override net_device fields */
dev->ieee80211_ptr = wdev;
dev->watchdog_timeo = HZ; /* 1 second timeout */
dev->wireless_handlers = &orinoco_handler_def;
#ifdef WIRELESS_SPY
dev->wireless_data = &priv->wireless_data;
#endif
/* Default to standard ops if not set */
if (ops)
dev->netdev_ops = ops;
else
dev->netdev_ops = &orinoco_netdev_ops;
/* we use the default eth_mac_addr for setting the MAC addr */
/* Reserve space in skb for the SNAP header */
dev->needed_headroom = ENCAPS_OVERHEAD;
netif_carrier_off(dev);
memcpy(dev->dev_addr, wiphy->perm_addr, ETH_ALEN);
dev->base_addr = base_addr;
dev->irq = irq;
SET_NETDEV_DEV(dev, priv->dev);
ret = register_netdev(dev);
if (ret)
goto fail;
priv->ndev = dev;
/* Report what we've done */
dev_dbg(priv->dev, "Registerred interface %s.\n", dev->name);
return 0;
fail:
free_netdev(dev);
return ret;
}
EXPORT_SYMBOL(orinoco_if_add);
void orinoco_if_del(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
unregister_netdev(dev);
free_netdev(dev);
}
EXPORT_SYMBOL(orinoco_if_del);
void free_orinocodev(struct orinoco_private *priv)
{
struct wiphy *wiphy = priv_to_wiphy(priv);
struct orinoco_rx_data *rx_data, *temp;
struct orinoco_scan_data *sd, *sdtemp;
wiphy_unregister(wiphy);
/* If the tasklet is scheduled when we call tasklet_kill it
* will run one final time. However the tasklet will only
* drain priv->rx_list if the hw is still available. */
tasklet_kill(&priv->rx_tasklet);
/* Explicitly drain priv->rx_list */
list_for_each_entry_safe(rx_data, temp, &priv->rx_list, list) {
list_del(&rx_data->list);
dev_kfree_skb(rx_data->skb);
kfree(rx_data->desc);
kfree(rx_data);
}
cancel_work_sync(&priv->process_scan);
/* Explicitly drain priv->scan_list */
list_for_each_entry_safe(sd, sdtemp, &priv->scan_list, list) {
list_del(&sd->list);
if (sd->len > 0)
kfree(sd->buf);
kfree(sd);
}
orinoco_unregister_pm_notifier(priv);
orinoco_uncache_fw(priv);
priv->wpa_ie_len = 0;
kfree(priv->wpa_ie);
orinoco_mic_free(priv);
wiphy_free(wiphy);
}
EXPORT_SYMBOL(free_orinocodev);
int orinoco_up(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
unsigned long flags;
int err;
priv->hw.ops->lock_irqsave(&priv->lock, &flags);
err = orinoco_reinit_firmware(priv);
if (err) {
printk(KERN_ERR "%s: Error %d re-initializing firmware\n",
dev->name, err);
goto exit;
}
netif_device_attach(dev);
priv->hw_unavailable--;
if (priv->open && !priv->hw_unavailable) {
err = __orinoco_up(priv);
if (err)
printk(KERN_ERR "%s: Error %d restarting card\n",
dev->name, err);
}
exit:
priv->hw.ops->unlock_irqrestore(&priv->lock, &flags);
return 0;
}
EXPORT_SYMBOL(orinoco_up);
void orinoco_down(struct orinoco_private *priv)
{
struct net_device *dev = priv->ndev;
unsigned long flags;
int err;
priv->hw.ops->lock_irqsave(&priv->lock, &flags);
err = __orinoco_down(priv);
if (err)
printk(KERN_WARNING "%s: Error %d downing interface\n",
dev->name, err);
netif_device_detach(dev);
priv->hw_unavailable++;
priv->hw.ops->unlock_irqrestore(&priv->lock, &flags);
}
EXPORT_SYMBOL(orinoco_down);
/********************************************************************/
/* Module initialization */
/********************************************************************/
/* Can't be declared "const" or the whole __initdata section will
* become const */
static char version[] __initdata = DRIVER_NAME " " DRIVER_VERSION
" (David Gibson <hermes@gibson.dropbear.id.au>, "
"Pavel Roskin <proski@gnu.org>, et al)";
static int __init init_orinoco(void)
{
printk(KERN_DEBUG "%s\n", version);
return 0;
}
static void __exit exit_orinoco(void)
{
}
module_init(init_orinoco);
module_exit(exit_orinoco);
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