1 // SPDX-License-Identifier: GPL-2.0-only
3 * This file contains the handling of RX in wlan driver.
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8 #include <linux/etherdevice.h>
9 #include <linux/hardirq.h>
10 #include <linux/slab.h>
11 #include <linux/types.h>
12 #include <linux/export.h>
13 #include <net/cfg80211.h>
37 struct eth803hdr eth803_hdr;
38 struct rfc1042hdr rfc1042_hdr;
41 struct rx80211packethdr {
46 static int process_rxed_802_11_packet(struct lbs_private *priv,
50 * lbs_process_rxed_packet - processes received packet and forwards it
51 * to kernel/upper layer
53 * @priv: A pointer to &struct lbs_private
54 * @skb: A pointer to skb which includes the received packet
57 int lbs_process_rxed_packet(struct lbs_private *priv, struct sk_buff *skb)
60 struct net_device *dev = priv->dev;
61 struct rxpackethdr *p_rx_pkt;
64 struct ethhdr *p_ethhdr;
68 skb->ip_summed = CHECKSUM_NONE;
70 if (priv->wdev->iftype == NL80211_IFTYPE_MONITOR) {
71 ret = process_rxed_802_11_packet(priv, skb);
75 p_rx_pd = (struct rxpd *) skb->data;
76 p_rx_pkt = (struct rxpackethdr *) ((u8 *)p_rx_pd +
77 le32_to_cpu(p_rx_pd->pkt_ptr));
79 dev = lbs_mesh_set_dev(priv, dev, p_rx_pd);
81 lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
82 min_t(unsigned int, skb->len, 100));
84 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
85 lbs_deb_rx("rx err: frame received with bad length\n");
86 dev->stats.rx_length_errors++;
92 lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n",
93 skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr),
94 skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr));
96 lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
97 sizeof(p_rx_pkt->eth803_hdr.dest_addr));
98 lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
99 sizeof(p_rx_pkt->eth803_hdr.src_addr));
101 if (memcmp(&p_rx_pkt->rfc1042_hdr,
102 rfc1042_header, sizeof(rfc1042_header)) == 0) {
104 * Replace the 803 header and rfc1042 header (llc/snap) with an
105 * EthernetII header, keep the src/dst and snap_type (ethertype)
107 * The firmware only passes up SNAP frames converting
108 * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
110 * To create the Ethernet II, just move the src, dst address right
111 * before the snap_type.
113 p_ethhdr = (struct ethhdr *)
114 ((u8 *) &p_rx_pkt->eth803_hdr
115 + sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
116 - sizeof(p_rx_pkt->eth803_hdr.dest_addr)
117 - sizeof(p_rx_pkt->eth803_hdr.src_addr)
118 - sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
120 memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
121 sizeof(p_ethhdr->h_source));
122 memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
123 sizeof(p_ethhdr->h_dest));
125 /* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
128 hdrchop = (u8 *)p_ethhdr - (u8 *)p_rx_pd;
130 lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
131 (u8 *) &p_rx_pkt->rfc1042_hdr,
132 sizeof(p_rx_pkt->rfc1042_hdr));
134 /* Chop off the rxpd */
135 hdrchop = (u8 *)&p_rx_pkt->eth803_hdr - (u8 *)p_rx_pd;
138 /* Chop off the leading header bytes so the skb points to the start of
139 * either the reconstructed EthII frame or the 802.2/llc/snap frame
141 skb_pull(skb, hdrchop);
143 priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
145 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
146 dev->stats.rx_bytes += skb->len;
147 dev->stats.rx_packets++;
149 skb->protocol = eth_type_trans(skb, dev);
156 EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);
159 * convert_mv_rate_to_radiotap - converts Tx/Rx rates from Marvell WLAN format
160 * (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
163 * returns: Output Rate (0 if invalid)
165 static u8 convert_mv_rate_to_radiotap(u8 rate)
172 case 2: /* 5.5 Mbps */
174 case 3: /* 11 Mbps */
176 /* case 4: reserved */
181 case 7: /* 12 Mbps */
183 case 8: /* 18 Mbps */
185 case 9: /* 24 Mbps */
187 case 10: /* 36 Mbps */
189 case 11: /* 48 Mbps */
191 case 12: /* 54 Mbps */
194 pr_alert("Invalid Marvell WLAN rate %i\n", rate);
199 * process_rxed_802_11_packet - processes a received 802.11 packet and forwards
200 * it to kernel/upper layer
202 * @priv: A pointer to &struct lbs_private
203 * @skb: A pointer to skb which includes the received packet
206 static int process_rxed_802_11_packet(struct lbs_private *priv,
210 struct net_device *dev = priv->dev;
211 struct rx80211packethdr *p_rx_pkt;
213 struct rx_radiotap_hdr radiotap_hdr;
214 struct rx_radiotap_hdr *pradiotap_hdr;
216 p_rx_pkt = (struct rx80211packethdr *) skb->data;
217 prxpd = &p_rx_pkt->rx_pd;
219 /* lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100)); */
221 if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
222 lbs_deb_rx("rx err: frame received with bad length\n");
223 dev->stats.rx_length_errors++;
229 lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
230 skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
232 /* create the exported radio header */
234 /* radiotap header */
235 memset(&radiotap_hdr, 0, sizeof(radiotap_hdr));
236 /* XXX must check radiotap_hdr.hdr.it_pad for pad */
237 radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
238 radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
239 radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
240 /* XXX must check no carryout */
241 radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
244 skb_pull(skb, sizeof(struct rxpd));
246 /* add space for the new radio header */
247 if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
248 pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {
249 netdev_alert(dev, "%s: couldn't pskb_expand_head\n", __func__);
255 pradiotap_hdr = skb_push(skb, sizeof(struct rx_radiotap_hdr));
256 memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
258 priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
260 lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
261 dev->stats.rx_bytes += skb->len;
262 dev->stats.rx_packets++;
264 skb->protocol = eth_type_trans(skb, priv->dev);