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mac80211: provide sequence numbers

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I've come to think that not providing sequence numbers for
the normal STA mode case was a mistake, at least two drivers
now had to implement code they wouldn't otherwise need, and
I believe at76_usb and adm8211 might be broken.

This patch makes mac80211 assign a sequence number to all
those frames that need one except beacons. That means that
if a driver only implements modes that do not do beaconing
it need not worry about the sequence number.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2008-10-10 13:21:59 +02:00 committed by John W. Linville
parent 2e20cc3986
commit 94778280fa
6 changed files with 21 additions and 29 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/net/wireless/p54/p54.h
View file

@ -67,7 +67,6 @@ struct p54_common {
int (*open)(struct ieee80211_hw *dev);
void (*stop)(struct ieee80211_hw *dev);
int mode;
u16 seqno;
u16 rx_mtu;
u8 headroom;
u8 tailroom;

18
drivers/net/wireless/p54/p54common.c
View file

@ -856,19 +856,6 @@ static int p54_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
if (padding)
txhdr->align[0] = padding;
/* FIXME: The sequence that follows is needed for this driver to
* work with mac80211 since "mac80211: fix TX sequence numbers".
* As with the temporary code in rt2x00, changes will be needed
* to get proper sequence numbers on beacons. In addition, this
* patch places the sequence number in the hardware state, which
* limits us to a single virtual state.
*/
if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
priv->seqno += 0x10;
ieee80211hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
ieee80211hdr->seq_ctrl |= cpu_to_le16(priv->seqno);
}
/* modifies skb->cb and with it info, so must be last! */
p54_assign_address(dev, skb, hdr, skb->len);
@ -1392,6 +1379,11 @@ struct ieee80211_hw *p54_init_common(size_t priv_data_len)
IEEE80211_HW_SIGNAL_DBM |
IEEE80211_HW_NOISE_DBM;
/*
* XXX: when this driver gets support for any mode that
* requires beacons (AP, MESH, IBSS) then it must
* implement IEEE80211_TX_CTL_ASSIGN_SEQ.
*/
dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
dev->channel_change_time = 1000; /* TODO: find actual value */

1
drivers/net/wireless/rtl8187.h
View file

@ -100,7 +100,6 @@ struct rtl8187_priv {
struct usb_device *udev;
u32 rx_conf;
u16 txpwr_base;
u16 seqno;
u8 asic_rev;
u8 is_rtl8187b;
enum {

18
drivers/net/wireless/rtl8187_dev.c
View file

@ -241,20 +241,6 @@ static int rtl8187_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
ep = epmap[skb_get_queue_mapping(skb)];
}
/* FIXME: The sequence that follows is needed for this driver to
* work with mac80211 since "mac80211: fix TX sequence numbers".
* As with the temporary code in rt2x00, changes will be needed
* to get proper sequence numbers on beacons. In addition, this
* patch places the sequence number in the hardware state, which
* limits us to a single virtual state.
*/
if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
priv->seqno += 0x10;
ieee80211hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
ieee80211hdr->seq_ctrl |= cpu_to_le16(priv->seqno);
}
info->driver_data[0] = dev;
info->driver_data[1] = urb;
@ -1187,6 +1173,10 @@ static int __devinit rtl8187_probe(struct usb_interface *intf,
dev->max_signal = 65;
}
/*
* XXX: Once this driver supports anything that requires
* beacons it must implement IEEE80211_TX_CTL_ASSIGN_SEQ.
*/
dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
if ((id->driver_info == DEVICE_RTL8187) && priv->is_rtl8187b)

2
net/mac80211/ieee80211_i.h
View file

@ -438,6 +438,8 @@ struct ieee80211_sub_if_data {
struct ieee80211_key *keys[NUM_DEFAULT_KEYS];
struct ieee80211_key *default_key;
u16 sequence_number;
/* BSS configuration for this interface. */
struct ieee80211_bss_conf bss_conf;

10
net/mac80211/tx.c
View file

@ -600,8 +600,18 @@ ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
if (ieee80211_hdrlen(hdr->frame_control) < 24)
return TX_CONTINUE;
/*
* Anything but QoS data that has a sequence number field
* (is long enough) gets a sequence number from the global
* counter.
*/
if (!ieee80211_is_data_qos(hdr->frame_control)) {
/* driver should assign sequence number */
info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
/* for pure STA mode without beacons, we can do it */
hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
tx->sdata->sequence_number += 0x10;
tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ;
return TX_CONTINUE;
}