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path: root/drivers/net/wireless/libertas/rx.c
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Diffstat (limited to 'drivers/net/wireless/libertas/rx.c')
-rw-r--r--drivers/net/wireless/libertas/rx.c459
1 files changed, 459 insertions, 0 deletions
diff --git a/drivers/net/wireless/libertas/rx.c b/drivers/net/wireless/libertas/rx.c
new file mode 100644
index 0000000..7e3f78f
--- /dev/null
+++ b/drivers/net/wireless/libertas/rx.c
@@ -0,0 +1,459 @@
+/**
+ * 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(wlan_private * priv, struct sk_buff *skb);
+
+/**
+ * @brief This function computes the avgSNR .
+ *
+ * @param priv A pointer to wlan_private structure
+ * @return avgSNR
+ */
+static u8 wlan_getavgsnr(wlan_private * priv)
+{
+ u8 i;
+ u16 temp = 0;
+ wlan_adapter *adapter = priv->adapter;
+ if (adapter->numSNRNF == 0)
+ return 0;
+ for (i = 0; i < adapter->numSNRNF; i++)
+ temp += adapter->rawSNR[i];
+ return (u8) (temp / adapter->numSNRNF);
+
+}
+
+/**
+ * @brief This function computes the AvgNF
+ *
+ * @param priv A pointer to wlan_private structure
+ * @return AvgNF
+ */
+static u8 wlan_getavgnf(wlan_private * priv)
+{
+ u8 i;
+ u16 temp = 0;
+ wlan_adapter *adapter = priv->adapter;
+ if (adapter->numSNRNF == 0)
+ return 0;
+ for (i = 0; i < adapter->numSNRNF; i++)
+ temp += adapter->rawNF[i];
+ return (u8) (temp / adapter->numSNRNF);
+
+}
+
+/**
+ * @brief This function save the raw SNR/NF to our internel buffer
+ *
+ * @param priv A pointer to wlan_private structure
+ * @param prxpd A pointer to rxpd structure of received packet
+ * @return n/a
+ */
+static void wlan_save_rawSNRNF(wlan_private * priv, struct rxpd *p_rx_pd)
+{
+ wlan_adapter *adapter = priv->adapter;
+ if (adapter->numSNRNF < adapter->data_avg_factor)
+ adapter->numSNRNF++;
+ adapter->rawSNR[adapter->nextSNRNF] = p_rx_pd->snr;
+ adapter->rawNF[adapter->nextSNRNF] = p_rx_pd->nf;
+ adapter->nextSNRNF++;
+ if (adapter->nextSNRNF >= adapter->data_avg_factor)
+ adapter->nextSNRNF = 0;
+ return;
+}
+
+/**
+ * @brief This function computes the RSSI in received packet.
+ *
+ * @param priv A pointer to wlan_private structure
+ * @param prxpd A pointer to rxpd structure of received packet
+ * @return n/a
+ */
+static void wlan_compute_rssi(wlan_private * priv, struct rxpd *p_rx_pd)
+{
+ wlan_adapter *adapter = priv->adapter;
+
+ ENTER();
+
+ lbs_pr_debug(1, "rxpd: SNR = %d, NF = %d\n", p_rx_pd->snr, p_rx_pd->nf);
+ lbs_pr_debug(1, "Before computing SNR: SNR- avg = %d, NF-avg = %d\n",
+ adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
+ adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
+
+ adapter->SNR[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->snr;
+ adapter->NF[TYPE_RXPD][TYPE_NOAVG] = p_rx_pd->nf;
+ wlan_save_rawSNRNF(priv, p_rx_pd);
+
+ adapter->rxpd_rate = p_rx_pd->rx_rate;
+
+ adapter->SNR[TYPE_RXPD][TYPE_AVG] = wlan_getavgsnr(priv) * AVG_SCALE;
+ adapter->NF[TYPE_RXPD][TYPE_AVG] = wlan_getavgnf(priv) * AVG_SCALE;
+ lbs_pr_debug(1, "After computing SNR: SNR-avg = %d, NF-avg = %d\n",
+ adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
+ adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
+
+ adapter->RSSI[TYPE_RXPD][TYPE_NOAVG] =
+ CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_NOAVG],
+ adapter->NF[TYPE_RXPD][TYPE_NOAVG]);
+
+ adapter->RSSI[TYPE_RXPD][TYPE_AVG] =
+ CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE,
+ adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE);
+
+ LEAVE();
+}
+
+int libertas_upload_rx_packet(wlan_private * priv, struct sk_buff *skb)
+{
+ lbs_pr_debug(1, "skb->data=%p\n", skb->data);
+
+ if(IS_MESH_FRAME(skb))
+ skb->dev = priv->mesh_dev;
+ else
+ skb->dev = priv->wlan_dev.netdev;
+ skb->protocol = eth_type_trans(skb, priv->wlan_dev.netdev);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ netif_rx(skb);
+
+ return 0;
+}
+
+/**
+ * @brief This function processes received packet and forwards it
+ * to kernel/upper layer
+ *
+ * @param priv A pointer to wlan_private
+ * @param skb A pointer to skb which includes the received packet
+ * @return 0 or -1
+ */
+int libertas_process_rxed_packet(wlan_private * priv, struct sk_buff *skb)
+{
+ wlan_adapter *adapter = priv->adapter;
+ int ret = 0;
+
+ 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 };
+
+ ENTER();
+
+ if (priv->adapter->debugmode & MRVDRV_DEBUG_RX_PATH)
+ lbs_dbg_hex("RX packet: ", skb->data,
+ min_t(unsigned int, skb->len, 100));
+
+ if (priv->adapter->linkmode == WLAN_LINKMODE_802_11)
+ return process_rxed_802_11_packet(priv, skb);
+
+ p_rx_pkt = (struct rxpackethdr *) skb->data;
+ p_rx_pd = &p_rx_pkt->rx_pd;
+ if (p_rx_pd->rx_control & RxPD_MESH_FRAME)
+ SET_MESH_FRAME(skb);
+ else
+ UNSET_MESH_FRAME(skb);
+
+ lbs_dbg_hex("RX Data: Before chop rxpd", skb->data,
+ min_t(unsigned int, skb->len, 100));
+
+ if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
+ lbs_pr_debug(1, "RX error: 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 & MRVDRV_RXPD_STATUS_OK)) {
+ lbs_pr_debug(1, "RX error: frame received with bad status\n");
+ lbs_pr_alert("rxpd Not OK\n");
+ priv->stats.rx_errors++;
+ ret = 0;
+ goto done;
+ }
+
+ lbs_pr_debug(1, "RX Data: skb->len - sizeof(RxPd) = %d - %d = %d\n",
+ skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
+
+ lbs_dbg_hex("RX Data: Dest", p_rx_pkt->eth803_hdr.dest_addr,
+ sizeof(p_rx_pkt->eth803_hdr.dest_addr));
+ lbs_dbg_hex("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_dbg_hex("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 (adapter->is_datarate_auto)
+ adapter->datarate = libertas_index_to_data_rate(p_rx_pd->rx_rate);
+
+ wlan_compute_rssi(priv, p_rx_pd);
+
+ lbs_pr_debug(1, "RX Data: size of actual packet = %d\n", skb->len);
+ if (libertas_upload_rx_packet(priv, skb)) {
+ lbs_pr_debug(1, "RX error: libertas_upload_rx_packet"
+ " returns failure\n");
+ ret = -1;
+ goto done;
+ }
+ priv->stats.rx_bytes += skb->len;
+ priv->stats.rx_packets++;
+
+ ret = 0;
+done:
+ LEAVE();
+
+ return ret;
+}
+
+/**
+ * @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: /* 6 Mbps */
+ return 12;
+ case 5: /* 9 Mbps */
+ return 18;
+ case 6: /* 12 Mbps */
+ return 24;
+ case 7: /* 18 Mbps */
+ return 36;
+ case 8: /* 24 Mbps */
+ return 48;
+ case 9: /* 36 Mbps */
+ return 72;
+ case 10: /* 48 Mbps */
+ return 96;
+ case 11: /* 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 wlan_private
+ * @param skb A pointer to skb which includes the received packet
+ * @return 0 or -1
+ */
+static int process_rxed_802_11_packet(wlan_private * priv, struct sk_buff *skb)
+{
+ wlan_adapter *adapter = priv->adapter;
+ int ret = 0;
+
+ struct rx80211packethdr *p_rx_pkt;
+ struct rxpd *prxpd;
+ struct rx_radiotap_hdr radiotap_hdr;
+ struct rx_radiotap_hdr *pradiotap_hdr;
+
+ ENTER();
+
+ p_rx_pkt = (struct rx80211packethdr *) skb->data;
+ prxpd = &p_rx_pkt->rx_pd;
+
+ // lbs_dbg_hex("RX Data: Before chop rxpd", skb->data, min(skb->len, 100));
+
+ if (skb->len < (ETH_HLEN + 8 + sizeof(struct rxpd))) {
+ lbs_pr_debug(1, "RX error: FRAME RECEIVED WITH BAD LENGTH\n");
+ priv->stats.rx_length_errors++;
+ ret = 0;
+ goto done;
+ }
+
+ /*
+ * Check rxpd status and update 802.3 stat,
+ */
+ if (!(prxpd->status & MRVDRV_RXPD_STATUS_OK)) {
+ //lbs_pr_debug(1, "RX error: frame received with bad status\n");
+ priv->stats.rx_errors++;
+ }
+
+ lbs_pr_debug(1, "RX Data: skb->len - sizeof(RxPd) = %d - %d = %d\n",
+ skb->len, sizeof(struct rxpd), skb->len - sizeof(struct rxpd));
+
+ /* create the exported radio header */
+ switch (priv->adapter->radiomode) {
+ case WLAN_RADIOMODE_NONE:
+ /* no radio header */
+ /* chop the rxpd */
+ skb_pull(skb, sizeof(struct rxpd));
+ break;
+
+ case WLAN_RADIOMODE_RADIOTAP:
+ /* 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 = sizeof(struct rx_radiotap_hdr);
+ radiotap_hdr.hdr.it_present = 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 & MRVDRV_RXPD_STATUS_OK))
+ radiotap_hdr.rx_flags |= IEEE80211_RADIOTAP_F_RX_BADFCS;
+ //memset(radiotap_hdr.pad, 0x11, IEEE80211_RADIOTAP_HDRLEN - 18);
+
+ // lbs_dbg_hex1("RX radiomode packet BEF: ", skb->data, min(skb->len, 100));
+
+ /* 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__);
+ }
+
+ pradiotap_hdr =
+ (struct rx_radiotap_hdr *)skb_push(skb,
+ sizeof(struct
+ rx_radiotap_hdr));
+ memcpy(pradiotap_hdr, &radiotap_hdr,
+ sizeof(struct rx_radiotap_hdr));
+ //lbs_dbg_hex1("RX radiomode packet AFT: ", skb->data, min(skb->len, 100));
+ break;
+
+ default:
+ /* unknown header */
+ lbs_pr_alert( "Unknown radiomode (%i)\n",
+ priv->adapter->radiomode);
+ /* don't export any header */
+ /* chop the rxpd */
+ skb_pull(skb, sizeof(struct rxpd));
+ break;
+ }
+
+ /* Take the data rate from the rxpd structure
+ * only if the rate is auto
+ */
+ if (adapter->is_datarate_auto) {
+ adapter->datarate = libertas_index_to_data_rate(prxpd->rx_rate);
+ }
+
+ wlan_compute_rssi(priv, prxpd);
+
+ lbs_pr_debug(1, "RX Data: size of actual packet = %d\n", skb->len);
+
+ if (libertas_upload_rx_packet(priv, skb)) {
+ lbs_pr_debug(1, "RX error: libertas_upload_rx_packet "
+ "returns failure\n");
+ ret = -1;
+ goto done;
+ }
+
+ priv->stats.rx_bytes += skb->len;
+ priv->stats.rx_packets++;
+
+ ret = 0;
+done:
+ LEAVE();
+
+ skb->protocol = __constant_htons(0x0019); /* ETH_P_80211_RAW */
+
+ return (ret);
+}
generated by cgit v0.10.2 at 2024-11-12 08:14:20 (GMT)