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openwrt-xburst/package/mac80211/patches/422-mac80211-seqno-station.patch
nbd 090f16f6fb mac80211: add rate control rewrite and enhance the performance of the minstrel algorithm for non-mrr configurations 
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12948 3c298f89-4303-0410-b956-a3cf2f4a3e73
2008-10-11 01:33:09 +00:00

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Subject: mac80211: provide sequence numbers
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>
---
drivers/net/wireless/p54/p54.h | 1 -
drivers/net/wireless/p54/p54common.c | 18 +++++-------------
drivers/net/wireless/rtl8187.h | 1 -
drivers/net/wireless/rtl8187_dev.c | 18 ++++--------------
net/mac80211/ieee80211_i.h | 2 ++
net/mac80211/tx.c | 10 ++++++++++
6 files changed, 21 insertions(+), 29 deletions(-)
--- everything.orig/net/mac80211/ieee80211_i.h 2008-10-10 15:45:52.000000000 +0200
+++ everything/net/mac80211/ieee80211_i.h 2008-10-10 15:45:56.000000000 +0200
@@ -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;
--- everything.orig/net/mac80211/tx.c 2008-10-10 15:45:48.000000000 +0200
+++ everything/net/mac80211/tx.c 2008-10-10 15:45:56.000000000 +0200
@@ -602,8 +602,18 @@ ieee80211_tx_h_sequence(struct ieee80211
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;
}
--- everything.orig/drivers/net/wireless/p54/p54.h 2008-10-10 15:45:49.000000000 +0200
+++ everything/drivers/net/wireless/p54/p54.h 2008-10-10 15:45:56.000000000 +0200
@@ -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;
--- everything.orig/drivers/net/wireless/p54/p54common.c 2008-10-10 15:45:49.000000000 +0200
+++ everything/drivers/net/wireless/p54/p54common.c 2008-10-10 15:45:56.000000000 +0200
@@ -865,19 +865,6 @@ static int p54_tx(struct ieee80211_hw *d
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);
@@ -1391,6 +1378,11 @@ struct ieee80211_hw *p54_init_common(siz
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 */
--- everything.orig/drivers/net/wireless/rtl8187_dev.c 2008-10-10 15:45:49.000000000 +0200
+++ everything/drivers/net/wireless/rtl8187_dev.c 2008-10-10 15:45:56.000000000 +0200
@@ -238,20 +238,6 @@ static int rtl8187_tx(struct ieee80211_h
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;
@@ -1185,6 +1171,10 @@ static int __devinit rtl8187_probe(struc
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)
--- everything.orig/drivers/net/wireless/rtl8187.h 2008-10-10 15:45:49.000000000 +0200
+++ everything/drivers/net/wireless/rtl8187.h 2008-10-10 15:45:56.000000000 +0200
@@ -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 {
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