+++ /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);
-
- BUG_ON(!skb);
-
- skb->ip_summed = CHECKSUM_NONE;
-
- if (priv->monitormode)
- 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);
- if (in_interrupt())
- netif_rx(skb);
- else
- netif_rx_ni(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 / openwrt.git / blobdiff