This patch was actually orginally submitted by Felix Fietkau in the
linus-wireless mailing list.
The patch allows userspace applications that use packet injection to specify
the frame transmission rate on a per-packet basis.
Signed-off-by: Roberto Riggio<[email protected]>
--
Index: package/mac80211/patches/810-radiotap_rate.patch
===================================================================
--- package/mac80211/patches/810-radiotap_rate.patch (revision 0)
+++ package/mac80211/patches/810-radiotap_rate.patch (revision 0)
@@ -0,0 +1,73 @@
+diff -urN compat-wireless-2010-06-10.old/include/net/mac80211.h
compat-wireless-2010-06-10.new/include/net/mac80211.h
+--- compat-wireless-2010-06-10.old/include/net/mac80211.h 2010-06-10
22:52:03.000000000 +0200
++++ compat-wireless-2010-06-10.new/include/net/mac80211.h 2010-06-12
10:18:02.623091853 +0200
+@@ -288,6 +288,7 @@
+ * @IEEE80211_TX_CTL_LDPC: tells the driver to use LDPC for this frame
+ * @IEEE80211_TX_CTL_STBC: Enables Space-Time Block Coding (STBC) for this
+ * frame and selects the maximum number of streams that it can use.
++ * @IEEE80211_TX_CTL_RC_BYPASS: Don't use rate control on the frame.
+ */
+ enum mac80211_tx_control_flags {
+ IEEE80211_TX_CTL_REQ_TX_STATUS = BIT(0),
+@@ -313,6 +314,7 @@
+ IEEE80211_TX_INTFL_NL80211_FRAME_TX = BIT(21),
+ IEEE80211_TX_CTL_LDPC = BIT(22),
+ IEEE80211_TX_CTL_STBC = BIT(23) | BIT(24),
++ IEEE80211_TX_CTL_RC_BYPASS = BIT(25),
+ };
+
+ #define IEEE80211_TX_CTL_STBC_SHIFT 23
+diff -urN compat-wireless-2010-06-10.old/net/mac80211/tx.c
compat-wireless-2010-06-10.new/net/mac80211/tx.c
+--- compat-wireless-2010-06-10.old/net/mac80211/tx.c 2010-06-10
22:52:03.000000000 +0200
++++ compat-wireless-2010-06-10.new/net/mac80211/tx.c 2010-06-12
10:20:45.203094264 +0200
+@@ -1068,6 +1068,40 @@
+ tx->flags |= IEEE80211_TX_FRAGMENTED;
+ break;
+
++ case IEEE80211_RADIOTAP_RATE: {
++ int i, idx = -1;
++ int rate = *iterator.this_arg * 5;
++
++ for (i = 0; i < sband->n_bitrates; i++)
++ if (sband->bitrates[i].bitrate == rate) {
++ idx = i;
++ break;
++ }
++
++ /* Rate not available - rejecting */
++ if (idx < 0)
++ return false;
++
++ info->flags |= IEEE80211_TX_CTL_RC_BYPASS;
++ info->control.rates[0].idx = idx;
++ info->control.rates[0].count = 1;
++ for (i = 1; i < IEEE80211_TX_MAX_RATES; i++)
++ info->control.rates[i].idx = -1;
++ break;
++ }
++
++ case IEEE80211_RADIOTAP_DATA_RETRIES:
++ /*
++ * Only allow setting the number of retries in
++ * conjunction with the rates, when the rate control
++ * is bypassed.
++ */
++ if (info->flags & IEEE80211_TX_CTL_RC_BYPASS)
++ info->control.rates[0].count =
++ *iterator.this_arg;
++ break;
++
++
+ /*
+ * Please update the file
+ * Documentation/networking/mac80211-injection.txt
+@@ -1374,7 +1373,8 @@
+ CALL_TXH(ieee80211_tx_h_check_assoc);
+ CALL_TXH(ieee80211_tx_h_ps_buf);
+ CALL_TXH(ieee80211_tx_h_select_key);
+- if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
++ if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
++ !(info->flags & IEEE80211_TX_CTL_RC_BYPASS))
+ CALL_TXH(ieee80211_tx_h_rate_ctrl);
+
+ if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION))
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