linux/drivers/net/wireless/libertas/rx.c
Daniel Drake 49fee69204 libertas: link mesh device to wiphy
The mesh device is now exposed as an interface of the wiphy.
This exposes the mesh device to the cfg80211 interface, allowing
mesh channel selection to be reimplemented, and available to
NetworkManager as it was before.

Some header tweaking was needed in order to implement lbs_mesh_activated().

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-08-08 14:26:31 -04:00

284 lines
7.3 KiB
C

/*
* This file contains the handling of RX in wlan driver.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/etherdevice.h>
#include <linux/hardirq.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <net/cfg80211.h>
#include "defs.h"
#include "host.h"
#include "radiotap.h"
#include "decl.h"
#include "dev.h"
#include "mesh.h"
struct eth803hdr {
u8 dest_addr[6];
u8 src_addr[6];
u16 h803_len;
} __packed;
struct rfc1042hdr {
u8 llc_dsap;
u8 llc_ssap;
u8 llc_ctrl;
u8 snap_oui[3];
u16 snap_type;
} __packed;
struct rxpackethdr {
struct eth803hdr eth803_hdr;
struct rfc1042hdr rfc1042_hdr;
} __packed;
struct rx80211packethdr {
struct rxpd rx_pd;
void *eth80211_hdr;
} __packed;
static int process_rxed_802_11_packet(struct lbs_private *priv,
struct sk_buff *skb);
/**
* lbs_process_rxed_packet - processes received packet and forwards it
* to kernel/upper layer
*
* @priv: A pointer to &struct lbs_private
* @skb: A pointer to skb which includes the received packet
* returns: 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;
static 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->wdev->iftype == NL80211_IFTYPE_MONITOR)
return process_rxed_802_11_packet(priv, skb);
p_rx_pd = (struct rxpd *) skb->data;
p_rx_pkt = (struct rxpackethdr *) ((u8 *)p_rx_pd +
le32_to_cpu(p_rx_pd->pkt_ptr));
dev = lbs_mesh_set_dev(priv, dev, p_rx_pd);
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");
dev->stats.rx_length_errors++;
ret = 0;
dev_kfree_skb(skb);
goto done;
}
lbs_deb_rx("rx data: skb->len - pkt_ptr = %d-%zd = %zd\n",
skb->len, (size_t)le32_to_cpu(p_rx_pd->pkt_ptr),
skb->len - (size_t)le32_to_cpu(p_rx_pd->pkt_ptr));
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_pd;
} 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_pd;
}
/* 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);
priv->cur_rate = lbs_fw_index_to_data_rate(p_rx_pd->rx_rate);
lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
dev->stats.rx_bytes += skb->len;
dev->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);
/**
* convert_mv_rate_to_radiotap - converts Tx/Rx rates from Marvell WLAN format
* (see Table 2 in Section 3.1) to IEEE80211_RADIOTAP_RATE units (500 Kb/s)
*
* @rate: Input rate
* returns: 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;
}
pr_alert("Invalid Marvell WLAN rate %i\n", rate);
return 0;
}
/**
* process_rxed_802_11_packet - processes a received 802.11 packet and forwards
* it to kernel/upper layer
*
* @priv: A pointer to &struct lbs_private
* @skb: A pointer to skb which includes the received packet
* returns: 0 or -1
*/
static int process_rxed_802_11_packet(struct lbs_private *priv,
struct sk_buff *skb)
{
int ret = 0;
struct net_device *dev = priv->dev;
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");
dev->stats.rx_length_errors++;
ret = -EINVAL;
kfree_skb(skb);
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));
/* create the exported radio header */
/* radiotap header */
memset(&radiotap_hdr, 0, sizeof(radiotap_hdr));
/* XXX must check radiotap_hdr.hdr.it_pad for pad */
radiotap_hdr.hdr.it_len = cpu_to_le16 (sizeof(struct rx_radiotap_hdr));
radiotap_hdr.hdr.it_present = cpu_to_le32 (RX_RADIOTAP_PRESENT);
radiotap_hdr.rate = convert_mv_rate_to_radiotap(prxpd->rx_rate);
/* XXX must check no carryout */
radiotap_hdr.antsignal = prxpd->snr + prxpd->nf;
/* 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)) {
netdev_alert(dev, "%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));
priv->cur_rate = lbs_fw_index_to_data_rate(prxpd->rx_rate);
lbs_deb_rx("rx data: size of actual packet %d\n", skb->len);
dev->stats.rx_bytes += skb->len;
dev->stats.rx_packets++;
skb->protocol = eth_type_trans(skb, priv->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;
}