1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1291,6 +1291,11 @@ static void ath9k_stop(struct ieee80211_
} else
sc->rx.rxlink = NULL;
+ if (sc->rx.frag) {
+ dev_kfree_skb_any(sc->rx.frag);
+ sc->rx.frag = NULL;
+ }
+
/* disable HAL and put h/w to sleep */
ath9k_hw_disable(ah);
ath9k_hw_configpcipowersave(ah, 1, 1);
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -209,11 +209,6 @@ static int ath_rx_edma_init(struct ath_s
int error = 0, i;
u32 size;
-
- common->rx_bufsize = roundup(IEEE80211_MAX_MPDU_LEN +
- ah->caps.rx_status_len,
- min(common->cachelsz, (u16)64));
-
ath9k_hw_set_rx_bufsize(ah, common->rx_bufsize -
ah->caps.rx_status_len);
@@ -300,12 +295,12 @@ int ath_rx_init(struct ath_softc *sc, in
sc->sc_flags &= ~SC_OP_RXFLUSH;
spin_lock_init(&sc->rx.rxbuflock);
+ common->rx_bufsize = IEEE80211_MAX_MPDU_LEN / 2 +
+ sc->sc_ah->caps.rx_status_len;
+
if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
return ath_rx_edma_init(sc, nbufs);
} else {
- common->rx_bufsize = roundup(IEEE80211_MAX_MPDU_LEN,
- min(common->cachelsz, (u16)64));
-
ath_dbg(common, ATH_DBG_CONFIG, "cachelsz %u rxbufsize %u\n",
common->cachelsz, common->rx_bufsize);
@@ -815,15 +810,9 @@ static bool ath9k_rx_accept(struct ath_c
if (rx_stats->rs_datalen > (common->rx_bufsize - rx_status_len))
return false;
- /*
- * rs_more indicates chained descriptors which can be used
- * to link buffers together for a sort of scatter-gather
- * operation.
- * reject the frame, we don't support scatter-gather yet and
- * the frame is probably corrupt anyway
- */
+ /* Only use error bits from the last fragment */
if (rx_stats->rs_more)
- return false;
+ return true;
/*
* The rx_stats->rs_status will not be set until the end of the
@@ -981,6 +970,10 @@ static int ath9k_rx_skb_preprocess(struc
if (!ath9k_rx_accept(common, hdr, rx_status, rx_stats, decrypt_error))
return -EINVAL;
+ /* Only use status info from the last fragment */
+ if (rx_stats->rs_more)
+ return 0;
+
ath9k_process_rssi(common, hw, hdr, rx_stats);
if (ath9k_process_rate(common, hw, rx_stats, rx_status))
@@ -1582,7 +1575,7 @@ div_comb_done:
int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
{
struct ath_buf *bf;
- struct sk_buff *skb = NULL, *requeue_skb;
+ struct sk_buff *skb = NULL, *requeue_skb, *hdr_skb;
struct ieee80211_rx_status *rxs;
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
@@ -1633,8 +1626,17 @@ int ath_rx_tasklet(struct ath_softc *sc,
if (!skb)
continue;
- hdr = (struct ieee80211_hdr *) (skb->data + rx_status_len);
- rxs = IEEE80211_SKB_RXCB(skb);
+ /*
+ * Take frame header from the first fragment and RX status from
+ * the last one.
+ */
+ if (sc->rx.frag)
+ hdr_skb = sc->rx.frag;
+ else
+ hdr_skb = skb;
+
+ hdr = (struct ieee80211_hdr *) (hdr_skb->data + rx_status_len);
+ rxs = IEEE80211_SKB_RXCB(hdr_skb);
ath_debug_stat_rx(sc, &rs);
@@ -1643,12 +1645,12 @@ int ath_rx_tasklet(struct ath_softc *sc,
* chain it back at the queue without processing it.
*/
if (flush)
- goto requeue;
+ goto requeue_drop_frag;
retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs,
rxs, &decrypt_error);
if (retval)
- goto requeue;
+ goto requeue_drop_frag;
rxs->mactime = (tsf & ~0xffffffffULL) | rs.rs_tstamp;
if (rs.rs_tstamp > tsf_lower &&
@@ -1668,7 +1670,7 @@ int ath_rx_tasklet(struct ath_softc *sc,
* skb and put it at the tail of the sc->rx.rxbuf list for
* processing. */
if (!requeue_skb)
- goto requeue;
+ goto requeue_drop_frag;
/* Unmap the frame */
dma_unmap_single(sc->dev, bf->bf_buf_addr,
@@ -1679,8 +1681,9 @@ int ath_rx_tasklet(struct ath_softc *sc,
if (ah->caps.rx_status_len)
skb_pull(skb, ah->caps.rx_status_len);
- ath9k_rx_skb_postprocess(common, skb, &rs,
- rxs, decrypt_error);
+ if (!rs.rs_more)
+ ath9k_rx_skb_postprocess(common, hdr_skb, &rs,
+ rxs, decrypt_error);
/* We will now give hardware our shiny new allocated skb */
bf->bf_mpdu = requeue_skb;
@@ -1697,6 +1700,38 @@ int ath_rx_tasklet(struct ath_softc *sc,
break;
}
+ if (rs.rs_more) {
+ /*
+ * rs_more indicates chained descriptors which can be
+ * used to link buffers together for a sort of
+ * scatter-gather operation.
+ */
+ if (sc->rx.frag) {
+ /* too many fragments - cannot handle frame */
+ dev_kfree_skb_any(sc->rx.frag);
+ dev_kfree_skb_any(skb);
+ skb = NULL;
+ }
+ sc->rx.frag = skb;
+ goto requeue;
+ }
+
+ if (sc->rx.frag) {
+ int space = skb->len - skb_tailroom(hdr_skb);
+
+ sc->rx.frag = NULL;
+
+ if (pskb_expand_head(hdr_skb, 0, space, GFP_ATOMIC) < 0) {
+ dev_kfree_skb(skb);
+ goto requeue_drop_frag;
+ }
+
+ skb_copy_from_linear_data(skb, skb_put(hdr_skb, skb->len),
+ skb->len);
+ dev_kfree_skb_any(skb);
+ skb = hdr_skb;
+ }
+
/*
* change the default rx antenna if rx diversity chooses the
* other antenna 3 times in a row.
@@ -1722,6 +1757,11 @@ int ath_rx_tasklet(struct ath_softc *sc,
ieee80211_rx(hw, skb);
+requeue_drop_frag:
+ if (sc->rx.frag) {
+ dev_kfree_skb_any(sc->rx.frag);
+ sc->rx.frag = NULL;
+ }
requeue:
if (edma) {
list_add_tail(&bf->list, &sc->rx.rxbuf);
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -311,6 +311,8 @@ struct ath_rx {
struct ath_descdma rxdma;
struct ath_buf *rx_bufptr;
struct ath_rx_edma rx_edma[ATH9K_RX_QUEUE_MAX];
+
+ struct sk_buff *frag;
};
int ath_startrecv(struct ath_softc *sc);
|
