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Add HT MCS table and helper for 802.11n bitrate lookup #83

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Add HT MCS table and helper for 802.11n bitrate lookup #83

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58a1817
Use timer_delete_sync() on Linux >= 6.1.84
horseface1110 May 30, 2025
f49060e
Add HT MCS table and bitrate lookup helper
horseface1110 Jun 21, 2025
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45 changes: 45 additions & 0 deletions vwifi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -200,6 +200,8 @@ struct vwifi_vif {

/* Transmit power */
s32 tx_power;

struct cfg80211_bitrate_mask bitrate_mask;
};

static int station = 2;
Expand All @@ -214,6 +216,27 @@ static struct vwifi_context *vwifi = NULL;

static struct sock *nl_sk = NULL;

struct ht_mcs_entry {
int mcs_index;
int bitrate_20mhz_gi08; // in kbps
int bitrate_20mhz_gi04; // in kbps
};

static const struct ht_mcs_entry ht_mcs_table[32] = {
{0, 6500, 7200}, {1, 13000, 14400}, {2, 19500, 21700},
{3, 26000, 28900}, {4, 39000, 43300}, {5, 52000, 57800},
{6, 58500, 65000}, {7, 65000, 72200}, {8, 13000, 14400},
{9, 26000, 28900}, {10, 39000, 43300}, {11, 52000, 57800},
{12, 78000, 86700}, {13, 104000, 115600}, {14, 117000, 130000},
{15, 130000, 144400}, {16, 19500, 21700}, {17, 39000, 43300},
{18, 58500, 65000}, {19, 78000, 86700}, {20, 117000, 130000},
{21, 156000, 173300}, {22, 175500, 195000}, {23, 195000, 216700},
{24, 26000, 28900}, {25, 52000, 57800}, {26, 78000, 86700},
{27, 104000, 115600}, {28, 156000, 173300}, {29, 208000, 231100},
{30, 234000, 260000}, {31, 260000, 288900},
};


static int denylist_check(char *dest, char *source)
{
if (!vwifi->denylist || !*(vwifi->denylist))
Expand Down Expand Up @@ -702,6 +725,20 @@ static int vwifi_ndo_stop(struct net_device *dev)
return 0;
}

static inline int get_ht_bitrate_kbps(const struct vwifi_vif *vif,
int mcs_index)
{
enum nl80211_txrate_gi gi = vif->bitrate_mask.control[NL80211_BAND_2GHZ].gi;

if (mcs_index < 0 || mcs_index >= 32)
return 0; // fallback for invalid index

if (gi == NL80211_TXRATE_FORCE_SGI)
return ht_mcs_table[mcs_index].bitrate_20mhz_gi04;
else
return ht_mcs_table[mcs_index].bitrate_20mhz_gi08;
}

static struct net_device_stats *vwifi_ndo_get_stats(struct net_device *dev)
{
struct vwifi_vif *vif = ndev_get_vwifi_vif(dev);
Expand Down Expand Up @@ -1974,7 +2011,11 @@ static int vwifi_delete_interface(struct vwifi_vif *vif)

cancel_work_sync(&vif->ws_scan);
cancel_work_sync(&vif->ws_scan_timeout);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 1, 84)
timer_delete_sync(&vif->scan_complete);
#else
del_timer_sync(&vif->scan_complete);
#endif

/* If there's a pending scan, call cfg80211_scan_done to finish it. */
if (vif->scan_request) {
Expand All @@ -1985,7 +2026,11 @@ static int vwifi_delete_interface(struct vwifi_vif *vif)
}

/* Make sure that no work is queued */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 1, 84)
timer_delete_sync(&vif->scan_timeout);
#else
del_timer_sync(&vif->scan_timeout);
#endif
cancel_work_sync(&vif->ws_connect);
cancel_work_sync(&vif->ws_disconnect);

Expand Down