2 * This file contains the handling of RX in wlan driver.
5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7 #include <linux/etherdevice.h>
8 #include <linux/hardirq.h>
9 #include <linux/slab.h>
10 #include <linux/types.h>
11 #include <net/cfg80211.h>
35 struct eth803hdr eth803_hdr;
36 struct rfc1042hdr rfc1042_hdr;
39 struct rx80211packethdr {
44 static int process_rxed_802_11_packet(struct lbs_private *priv,
48 * lbs_process_rxed_packet - processes received packet and forwards it
49 * to kernel/upper layer
51 * @priv: A pointer to &struct lbs_private
52 * @skb: A pointer to skb which includes the received packet
55 int lbs_process_rxed_packet(struct lbs_private *priv, struct sk_buff *skb)
58 struct net_device *dev = priv->dev;
59 struct rxpackethdr *p_rx_pkt;
62 struct ethhdr *p_ethhdr;
63 static const u8 rfc1042_eth_hdr[] = {
64 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
67 lbs_deb_enter(LBS_DEB_RX);
71 skb->ip_summed = CHECKSUM_NONE;
73 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR)
74 return process_rxed_802_11_packet(priv, skb);
76 p_rx_pd = (struct rxpd *) skb->data;
77 p_rx_pkt = (struct rxpackethdr *) ((u8 *)p_rx_pd +
78 le32_to_cpu(p_rx_pd->pkt_ptr));
80 dev = lbs_mesh_set_dev(priv, dev, p_rx_pd);
82 lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
83 min_t(unsigned int, skb->len, 100));
85 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
86 lbs_deb_rx("rx err: frame received with bad length\n");
87 dev->stats.rx_length_errors++;
93 lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n",
94 skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr),
95 skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr));
97 lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
98 sizeof(p_rx_pkt->eth803_hdr.dest_addr));
99 lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
100 sizeof(p_rx_pkt->eth803_hdr.src_addr));
102 if (memcmp(&p_rx_pkt->rfc1042_hdr,
103 rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
105 * Replace the 803 header and rfc1042 header (llc/snap) with an
106 * EthernetII header, keep the src/dst and snap_type (ethertype)
108 * The firmware only passes up SNAP frames converting
109 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
111 * To create the Ethernet II, just move the src, dst address right
112 * before the snap_type.
114 p_ethhdr = (struct ethhdr *)
115 ((u8 *) &p_rx_pkt->eth803_hdr
116 + sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
117 - sizeof(p_rx_pkt->eth803_hdr.dest_addr)
118 - sizeof(p_rx_pkt->eth803_hdr.src_addr)
119 - sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
121 memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
122 sizeof(p_ethhdr->h_source));
123 memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
124 sizeof(p_ethhdr->h_dest));
126 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
129 hdrchop = (u8 *)p_ethhdr - (u8 *)p_rx_pd;
131 lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
132 (u8 *) &p_rx_pkt->rfc1042_hdr,
133 sizeof(p_rx_pkt->rfc1042_hdr));
135 /* Chop off the rxpd */
136 hdrchop = (u8 *)&p_rx_pkt->eth803_hdr - (u8 *)p_rx_pd;
139 /* Chop off the leading header bytes so the skb points to the start of
140 * either the reconstructed EthII frame or the 802.2/llc/snap frame
142 skb_pull(skb, hdrchop);
144 priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
146 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
147 dev->stats.rx_bytes += skb->len;
148 dev->stats.rx_packets++;
150 skb->protocol = eth_type_trans(skb, dev);
158 lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
161 EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);
164 * convert_mv_rate_to_radiotap - converts Tx/Rx rates from Marvell WLAN format
165 * (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
168 * returns: Output Rate (0 if invalid)
170 static u8 convert_mv_rate_to_radiotap(u8 rate)
177 case 2: /* 5.5 Mbps */
179 case 3: /* 11 Mbps */
181 /* case 4: reserved */
186 case 7: /* 12 Mbps */
188 case 8: /* 18 Mbps */
190 case 9: /* 24 Mbps */
192 case 10: /* 36 Mbps */
194 case 11: /* 48 Mbps */
196 case 12: /* 54 Mbps */
199 pr_alert("Invalid Marvell WLAN rate %i\n", rate);
204 * process_rxed_802_11_packet - processes a received 802.11 packet and forwards
205 * it to kernel/upper layer
207 * @priv: A pointer to &struct lbs_private
208 * @skb: A pointer to skb which includes the received packet
211 static int process_rxed_802_11_packet(struct lbs_private *priv,
215 struct net_device *dev = priv->dev;
216 struct rx80211packethdr *p_rx_pkt;
218 struct rx_radiotap_hdr radiotap_hdr;
219 struct rx_radiotap_hdr *pradiotap_hdr;
221 lbs_deb_enter(LBS_DEB_RX);
223 p_rx_pkt = (struct rx80211packethdr *) skb->data;
224 prxpd = &p_rx_pkt->rx_pd;
226 /* lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100)); */
228 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
229 lbs_deb_rx("rx err: frame received with bad length\n");
230 dev->stats.rx_length_errors++;
236 lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
237 skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
239 /* create the exported radio header */
241 /* radiotap header */
242 memset(&radiotap_hdr, 0, sizeof(radiotap_hdr));
243 /* XXX must check radiotap_hdr.hdr.it_pad for pad */
244 radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
245 radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
246 radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
247 /* XXX must check no carryout */
248 radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
251 skb_pull(skb, sizeof(struct rxpd));
253 /* add space for the new radio header */
254 if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
255 pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {
256 netdev_alert(dev, "%s: couldn't pskb_expand_head\n", __func__);
262 pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr));
263 memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
265 priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
267 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
268 dev->stats.rx_bytes += skb->len;
269 dev->stats.rx_packets++;
271 skb->protocol = eth_type_trans(skb, priv->dev);
281 lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);