--- /dev/null
+/**
+ * This file contains the handling of RX in wlan driver.
+ */
+#include <linux/etherdevice.h>
+#include <linux/types.h>
+
+#include "hostcmd.h"
+#include "radiotap.h"
+#include "decl.h"
+#include "dev.h"
+#include "wext.h"
+
+struct eth803hdr {
+ u8 dest_addr[6];
+ u8 src_addr[6];
+ u16 h803_len;
+} __attribute__ ((packed));
+
+struct rfc1042hdr {
+ u8 llc_dsap;
+ u8 llc_ssap;
+ u8 llc_ctrl;
+ u8 snap_oui[3];
+ u16 snap_type;
+} __attribute__ ((packed));
+
+struct rxpackethdr {
+ struct rxpd rx_pd;
+ struct eth803hdr eth803_hdr;
+ struct rfc1042hdr rfc1042_hdr;
+} __attribute__ ((packed));
+
+struct rx80211packethdr {
+ struct rxpd rx_pd;
+ void *eth80211_hdr;
+} __attribute__ ((packed));
+
+static int process_rxed_802_11_packet(struct lbs_private *priv,
+ struct sk_buff *skb);
+
+/**
+ * @brief This function computes the avgSNR .
+ *
+ * @param priv A pointer to struct lbs_private structure
+ * @return avgSNR
+ */
+static u8 lbs_getavgsnr(struct lbs_private *priv)
+{
+ u8 i;
+ u16 temp = 0;
+ if (priv->numSNRNF == 0)
+ return 0;
+ for (i = 0; i < priv->numSNRNF; i++)
+ temp += priv->rawSNR[i];
+ return (u8) (temp / priv->numSNRNF);
+
+}
+
+/**
+ * @brief This function computes the AvgNF
+ *
+ * @param priv A pointer to struct lbs_private structure
+ * @return AvgNF
+ */
+static u8 lbs_getavgnf(struct lbs_private *priv)
+{
+ u8 i;
+ u16 temp = 0;
+ if (priv->numSNRNF == 0)
+ return 0;
+ for (i = 0; i < priv->numSNRNF; i++)
+ temp += priv->rawNF[i];
+ return (u8) (temp / priv->numSNRNF);
+
+}
+
+/**
+ * @brief This function save the raw SNR/NF to our internel buffer
+ *
+ * @param priv A pointer to struct lbs_private structure
+ * @param prxpd A pointer to rxpd structure of received packet
+ * @return n/a
+ */
+static void lbs_save_rawSNRNF(struct lbs_private *priv, struct rxpd *p_rx_pd)
+{
+ if (priv->numSNRNF < DEFAULT_DATA_AVG_FACTOR)
+ priv->numSNRNF++;
+ priv->rawSNR[priv->nextSNRNF] = p_rx_pd->snr;
+ priv->rawNF[priv->nextSNRNF] = p_rx_pd->nf;
+ priv->nextSNRNF++;
+ if (priv->nextSNRNF >= DEFAULT_DATA_AVG_FACTOR)
+ priv->nextSNRNF = 0;
+ return;
+}
+
+/**
+ * @brief This function computes the RSSI in received packet.
+ *
+ * @param priv A pointer to struct lbs_private structure
+ * @param prxpd A pointer to rxpd structure of received packet
+ * @return n/a
+ */
+static void lbs_compute_rssi(struct lbs_private *priv, struct rxpd *p_rx_pd)
+{
+
+ lbs_deb_enter(LBS_DEB_RX);
+
+ lbs_deb_rx("rxpd: SNR %d, NF %d\n", p_rx_pd->snr, p_rx_pd->nf);
+ lbs_deb_rx("before computing SNR: SNR-avg = %d, NF-avg = %d\n",
+ priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
+ priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
+
+ priv->SNR[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->snr;
+ priv->NF[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->nf;
+ lbs_save_rawSNRNF(priv, p_rx_pd);
+
+ priv->SNR[TYPE_RXPD][TYPE_AVG] = lbs_getavgsnr(priv) * AVG_SCALE;
+ priv->NF[TYPE_RXPD][TYPE_AVG] = lbs_getavgnf(priv) * AVG_SCALE;
+ lbs_deb_rx("after computing SNR: SNR-avg = %d, NF-avg = %d\n",
+ priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
+ priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
+
+ priv->RSSI[TYPE_RXPD][TYPE_NOAVG] =
+ CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_NOAVG],
+ priv->NF[TYPE_RXPD][TYPE_NOAVG]);
+
+ priv->RSSI[TYPE_RXPD][TYPE_AVG] =
+ CAL_RSSI(priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
+ priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
+
+ lbs_deb_leave(LBS_DEB_RX);
+}
+
+/**
+ * @brief This function processes received packet and forwards it
+ * to kernel/upper layer
+ *
+ * @param priv A pointer to struct lbs_private
+ * @param skb A pointer to skb which includes the received packet
+ * @return 0 or -1
+ */
+int lbs_process_rxed_packet(struct lbs_private *priv, struct sk_buff *skb)
+{
+ int ret = 0;
+ struct net_device *dev = priv->dev;
+ struct rxpackethdr *p_rx_pkt;
+ struct rxpd *p_rx_pd;
+
+ int hdrchop;
+ struct ethhdr *p_ethhdr;
+
+ const u8 rfc1042_eth_hdr[] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
+
+ lbs_deb_enter(LBS_DEB_RX);
+
+ skb->ip_summed = CHECKSUM_NONE;
+
+ if (priv->monitormode != LBS_MONITOR_OFF)
+ return process_rxed_802_11_packet(priv, skb);
+
+ p_rx_pkt = (struct rxpackethdr *) skb->data;
+ p_rx_pd = &p_rx_pkt->rx_pd;
+ if (priv->mesh_dev && (p_rx_pd->rx_control & RxPD_MESH_FRAME))
+ dev = priv->mesh_dev;
+
+ lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data,
+ min_t(unsigned int, skb->len, 100));
+
+ if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
+ lbs_deb_rx("rx err: frame received with bad length\n");
+ priv->stats.rx_length_errors++;
+ ret = 0;
+ goto done;
+ }
+
+ /*
+ * Check rxpd status and update 802.3 stat,
+ */
+ if (!(p_rx_pd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) {
+ lbs_deb_rx("rx err: frame received with bad status\n");
+ lbs_pr_alert("rxpd not ok\n");
+ priv->stats.rx_errors++;
+ ret = 0;
+ goto done;
+ }
+
+ lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
+ skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
+
+ lbs_deb_hex(LBS_DEB_RX, "RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
+ sizeof(p_rx_pkt->eth803_hdr.dest_addr));
+ lbs_deb_hex(LBS_DEB_RX, "RX Data: Src", p_rx_pkt->eth803_hdr.src_addr,
+ sizeof(p_rx_pkt->eth803_hdr.src_addr));
+
+ if (memcmp(&p_rx_pkt->rfc1042_hdr,
+ rfc1042_eth_hdr, sizeof(rfc1042_eth_hdr)) == 0) {
+ /*
+ * Replace the 803 header and rfc1042 header (llc/snap) with an
+ * EthernetII header, keep the src/dst and snap_type (ethertype)
+ *
+ * The firmware only passes up SNAP frames converting
+ * all RX Data from 802.11 to 802.2/LLC/SNAP frames.
+ *
+ * To create the Ethernet II, just move the src, dst address right
+ * before the snap_type.
+ */
+ p_ethhdr = (struct ethhdr *)
+ ((u8 *) & p_rx_pkt->eth803_hdr
+ + sizeof(p_rx_pkt->eth803_hdr) + sizeof(p_rx_pkt->rfc1042_hdr)
+ - sizeof(p_rx_pkt->eth803_hdr.dest_addr)
+ - sizeof(p_rx_pkt->eth803_hdr.src_addr)
+ - sizeof(p_rx_pkt->rfc1042_hdr.snap_type));
+
+ memcpy(p_ethhdr->h_source, p_rx_pkt->eth803_hdr.src_addr,
+ sizeof(p_ethhdr->h_source));
+ memcpy(p_ethhdr->h_dest, p_rx_pkt->eth803_hdr.dest_addr,
+ sizeof(p_ethhdr->h_dest));
+
+ /* Chop off the rxpd + the excess memory from the 802.2/llc/snap header
+ * that was removed
+ */
+ hdrchop = (u8 *) p_ethhdr - (u8 *) p_rx_pkt;
+ } else {
+ lbs_deb_hex(LBS_DEB_RX, "RX Data: LLC/SNAP",
+ (u8 *) & p_rx_pkt->rfc1042_hdr,
+ sizeof(p_rx_pkt->rfc1042_hdr));
+
+ /* Chop off the rxpd */
+ hdrchop = (u8 *) & p_rx_pkt->eth803_hdr - (u8 *) p_rx_pkt;
+ }
+
+ /* Chop off the leading header bytes so the skb points to the start of
+ * either the reconstructed EthII frame or the 802.2/llc/snap frame
+ */
+ skb_pull(skb, hdrchop);
+
+ /* Take the data rate from the rxpd structure
+ * only if the rate is auto
+ */
+ if (priv->auto_rate)
+ priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
+
+ lbs_compute_rssi(priv, p_rx_pd);
+
+ lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
+ priv->stats.rx_bytes += skb->len;
+ priv->stats.rx_packets++;
+
+ skb->protocol = eth_type_trans(skb, dev);
+ netif_rx(skb);
+
+ ret = 0;
+done:
+ lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(lbs_process_rxed_packet);
+
+/**
+ * @brief This function converts Tx/Rx rates from the Marvell WLAN format
+ * (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
+ *
+ * @param rate Input rate
+ * @return Output Rate (0 if invalid)
+ */
+static u8 convert_mv_rate_to_radiotap(u8 rate)
+{
+ switch (rate) {
+ case 0: /* 1 Mbps */
+ return 2;
+ case 1: /* 2 Mbps */
+ return 4;
+ case 2: /* 5.5 Mbps */
+ return 11;
+ case 3: /* 11 Mbps */
+ return 22;
+ /* case 4: reserved */
+ case 5: /* 6 Mbps */
+ return 12;
+ case 6: /* 9 Mbps */
+ return 18;
+ case 7: /* 12 Mbps */
+ return 24;
+ case 8: /* 18 Mbps */
+ return 36;
+ case 9: /* 24 Mbps */
+ return 48;
+ case 10: /* 36 Mbps */
+ return 72;
+ case 11: /* 48 Mbps */
+ return 96;
+ case 12: /* 54 Mbps */
+ return 108;
+ }
+ lbs_pr_alert("Invalid Marvell WLAN rate %i\n", rate);
+ return 0;
+}
+
+/**
+ * @brief This function processes a received 802.11 packet and forwards it
+ * to kernel/upper layer
+ *
+ * @param priv A pointer to struct lbs_private
+ * @param skb A pointer to skb which includes the received packet
+ * @return 0 or -1
+ */
+static int process_rxed_802_11_packet(struct lbs_private *priv,
+ struct sk_buff *skb)
+{
+ int ret = 0;
+
+ struct rx80211packethdr *p_rx_pkt;
+ struct rxpd *prxpd;
+ struct rx_radiotap_hdr radiotap_hdr;
+ struct rx_radiotap_hdr *pradiotap_hdr;
+
+ lbs_deb_enter(LBS_DEB_RX);
+
+ p_rx_pkt = (struct rx80211packethdr *) skb->data;
+ prxpd = &p_rx_pkt->rx_pd;
+
+ // lbs_deb_hex(LBS_DEB_RX, "RX Data: Before chop rxpd", skb->data, min(skb->len, 100));
+
+ if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
+ lbs_deb_rx("rx err: frame received with bad length\n");
+ priv->stats.rx_length_errors++;
+ ret = -EINVAL;
+ kfree(skb);
+ goto done;
+ }
+
+ /*
+ * Check rxpd status and update 802.3 stat,
+ */
+ if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK))) {
+ //lbs_deb_rx("rx err: frame received with bad status\n");
+ priv->stats.rx_errors++;
+ }
+
+ lbs_deb_rx("rx data: skb->len-sizeof(RxPd) = %d-%zd = %zd\n",
+ skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
+
+ /* create the exported radio header */
+
+ /* radiotap header */
+ radiotap_hdr.hdr.it_version = 0;
+ /* XXX must check this value for pad */
+ radiotap_hdr.hdr.it_pad = 0;
+ radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
+ radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
+ /* unknown values */
+ radiotap_hdr.flags = 0;
+ radiotap_hdr.chan_freq = 0;
+ radiotap_hdr.chan_flags = 0;
+ radiotap_hdr.antenna = 0;
+ /* known values */
+ radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
+ /* XXX must check no carryout */
+ radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
+ radiotap_hdr.rx_flags = 0;
+ if (!(prxpd->status & cpu_to_le16(MRVDRV_RXPD_STATUS_OK)))
+ radiotap_hdr.rx_flags |= IEEE80211_RADIOTAP_F_RX_BADFCS;
+ //memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18);
+
+ /* chop the rxpd */
+ skb_pull(skb, sizeof(struct rxpd));
+
+ /* add space for the new radio header */
+ if ((skb_headroom(skb) < sizeof(struct rx_radiotap_hdr)) &&
+ pskb_expand_head(skb, sizeof(struct rx_radiotap_hdr), 0, GFP_ATOMIC)) {
+ lbs_pr_alert("%s: couldn't pskb_expand_head\n", __func__);
+ ret = -ENOMEM;
+ kfree_skb(skb);
+ goto done;
+ }
+
+ pradiotap_hdr = (void *)skb_push(skb, sizeof(struct rx_radiotap_hdr));
+ memcpy(pradiotap_hdr, &radiotap_hdr, sizeof(struct rx_radiotap_hdr));
+
+ /* Take the data rate from the rxpd structure
+ * only if the rate is auto
+ */
+ if (priv->auto_rate)
+ priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
+
+ lbs_compute_rssi(priv, prxpd);
+
+ lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
+ priv->stats.rx_bytes += skb->len;
+ priv->stats.rx_packets++;
+
+ skb->protocol = eth_type_trans(skb, priv->rtap_net_dev);
+ netif_rx(skb);
+
+ ret = 0;
+
+done:
+ lbs_deb_leave_args(LBS_DEB_RX, "ret %d", ret);
+ return ret;
+}
projects / openwrt / svn-archive / archive.git / blobdiff