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Date: Wed, 31 Jan 2007 20:16:52 +0100
From: Ivo van Doorn <ivdoorn@...il.com>
To: Jiri Benc <jbenc@...e.cz>, "John Linville" <linville@...driver.com>
Cc: netdev@...r.kernel.org
Subject: [PATCH 2/2] d80211: Add software sequence support
Most hardware can keep track of sequence numbers themselves,
unfortunately *most* doesn't cover all devices. ;)
This patch will keep track of the sequence number if the flag
IEEE80211_HW_SOFTWARE_SEQUENCE has been set.
Signed-off-by Ivo van Doorn <IvDoorn@...il.com>
---
diff -rNU3 dscape/include/net/d80211.h dscape_seq/include/net/d80211.h
--- dscape/include/net/d80211.h 2007-01-31 19:38:14.000000000 +0100
+++ dscape_seq/include/net/d80211.h 2007-01-31 19:55:55.000000000 +0100
@@ -534,6 +534,9 @@
/* Does the device need the stack to create a RTS frame */
#define IEEE80211_HW_SOFTWARE_RTS (1<<15)
+ /* Does the HOST need to insert the frame sequence counter */
+#define IEEE80211_HW_SOFTWARE_SEQUENCE (1<<16)
+
u32 flags; /* hardware flags defined above */
/* Set to the size of a needed device specific skb headroom for TX skbs. */
diff -rNU3 dscape/net/d80211/ieee80211.c dscape_seq/net/d80211/ieee80211.c
--- dscape/net/d80211/ieee80211.c 2007-01-31 19:41:18.000000000 +0100
+++ dscape_seq/net/d80211/ieee80211.c 2007-01-31 20:04:36.000000000 +0100
@@ -441,6 +441,7 @@
size_t hdrlen, per_fragm, num_fragm, payload_len, left;
struct sk_buff **frags, *first, *frag;
int i;
+ u16 seq;
u8 *pos;
int frag_threshold = tx->local->fragmentation_threshold;
@@ -458,6 +459,7 @@
if (!frags)
goto fail;
+ seq = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_SEQ;
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
pos = first->data + hdrlen + per_fragm;
left = payload_len - per_fragm;
@@ -486,7 +488,7 @@
memcpy(fhdr, first->data, hdrlen);
if (i == num_fragm - 2)
fhdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREFRAGS);
- fhdr->seq_ctrl = cpu_to_le16(i + 1);
+ fhdr->seq_ctrl = cpu_to_le16(seq + ((i + 1) & IEEE80211_SCTL_FRAG));
copylen = left > per_fragm ? per_fragm : left;
memcpy(skb_put(frag, copylen), pos, copylen);
@@ -933,6 +935,19 @@
return TXRX_CONTINUE;
}
+static ieee80211_txrx_result
+ieee80211_tx_h_sequence(struct ieee80211_txrx_data *tx)
+{
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
+
+ if (!(tx->local->hw.flags & IEEE80211_HW_SOFTWARE_SEQUENCE) ||
+ ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control)) < 24)
+ return TXRX_CONTINUE;
+
+ ieee80211_include_sequence(tx->local, hdr);
+
+ return TXRX_CONTINUE;
+}
/* This function is called whenever the AP is about to exceed the maximum limit
* of buffered frames for power saving STAs. This situation should not really
@@ -1806,6 +1821,10 @@
memcpy(skb_put(skb, bh_len), b_head, bh_len);
+ if (!(hw->flags & IEEE80211_HW_SOFTWARE_SEQUENCE))
+ ieee80211_include_sequence(local,
+ (struct ieee80211_hdr *)skb->data);
+
ieee80211_beacon_add_tim(local, ap, skb);
if (b_tail) {
@@ -4323,6 +4342,7 @@
static ieee80211_tx_handler ieee80211_tx_handlers[] =
{
ieee80211_tx_h_check_assoc,
+ ieee80211_tx_h_sequence,
ieee80211_tx_h_ps_buf,
ieee80211_tx_h_select_key,
ieee80211_tx_h_michael_mic_add,
@@ -4497,6 +4517,7 @@
local->bridge_packets = 1;
+ local->seq_counter = 0;
local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
local->short_retry_limit = 7;
diff -rNU3 dscape/net/d80211/ieee80211_i.h dscape_seq/net/d80211/ieee80211_i.h
--- dscape/net/d80211/ieee80211_i.h 2007-01-31 19:41:53.000000000 +0100
+++ dscape_seq/net/d80211/ieee80211_i.h 2007-01-31 20:06:26.000000000 +0100
@@ -405,6 +405,7 @@
int *supp_rates[NUM_IEEE80211_MODES];
int *basic_rates[NUM_IEEE80211_MODES];
+ u16 seq_counter;
int rts_threshold;
int cts_protect_erp_frames;
int fragmentation_threshold;
@@ -601,6 +602,20 @@
spin_unlock_bh(&local->sta_lock);
}
+static inline void ieee80211_include_sequence(struct ieee80211_local *local,
+ struct ieee80211_hdr *hdr)
+{
+ /*
+ * Set the sequence number for this frame.
+ */
+ hdr->seq_ctrl = cpu_to_le16(local->seq_counter & IEEE80211_SCTL_SEQ);
+
+ /*
+ * Increase the sequence number.
+ */
+ local->seq_counter = (local->seq_counter + 0x10) & IEEE80211_SCTL_SEQ;
+}
+
/* ieee80211.c */
void ieee80211_release_hw(struct ieee80211_local *local);
int ieee80211_hw_config(struct ieee80211_local *local);
-
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