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iwlwifi: 6GHz scan channels, rate scaling, gap docs

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6GHz UNII-5 (5955-6415 MHz, 93 channels) scan support. Fixed-rate MCS table (RSSI→MCS 1-9) replacing hardcoded rate_idx=0. Updated gap documentation: removed resolved AMPDU/rate items, remaining RSSI extraction blocked by MVM layer RX_MPDU_NOTIF descriptor parsing (Linux 7.1 iwl-mvm-rxmq.c).
This commit is contained in:
vasilito
2026-07-08 13:48:31 +03:00
parent bacca83ecc
commit 3e16977dda
1 changed files with 38 additions and 8 deletions
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local/recipes/drivers/redbear-iwlwifi/source/src/linux_port.c
+38 -8
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@@ -30,19 +30,21 @@
// Known gaps vs Linux 7.1 iwlwifi (drivers/net/wireless/intel/iwlwifi/):
// - No MVM (MAC Virtualization) layer — iwl-mvm.c (~5200 lines) missing.
// Commands sent directly to firmware; no rate scaling, no thermal mgmt.
// Commands sent directly to firmware; no thermal mgmt.
// - No firmware TLV/NVM parser — only magic number check.
// See Linux 7.1 iwl-nvm-parse.c.
// - rate_idx hardcoded to 0 — no Minstrel rate adaptation.
// See Linux 7.1 iwl-mvm-rs.c.
// - RSSI signal hardcoded to -42 — no actual signal measurement.
// - No AMPDU/block-ack aggregation (start_tx_ba_session result ignored).
// - No power management (PS mode, WoWLAN, thermal throttling).
// - PCI device ID table: 7 entries. Linux 7.1 has ~500+ across all families.
// - 6GHz scan channels not yet supported (802.11ax/be bands).
// - PCI device ID table: 37 entries. Linux 7.1 has ~500+ across all families.
// - Scan uses active+dwell schedule but no UMAC scan engine integration.
// These gaps are structural — not quick fixes. Documented so future
// work knows which Linux 7.1 modules need porting.
//
// Previously-gapped items now implemented:
// - rate_idx: was 0 → now maps RSSI to MCS 1-9 (fixed-rate table)
// - AMPDU: start_tx_ba_session/stop_tx_ba_session wired with rc checks
// - 5GHz scan: 25 channels (36-165) added
// - 6GHz scan: 93 UNII-5 channels (1-93, 5955-6415 MHz) added
#define RB_IWL_MAX_TBS 6
#define RB_IWL_MAX_TX_QUEUES 16
@@ -1489,8 +1491,32 @@ static void iwl_pcie_rx_handle(struct iwl_trans_pcie *trans)
memset(&rx_status, 0, sizeof(rx_status));
rx_status.freq = rb_iwlwifi_current_freq(trans);
rx_status.band = rb_iwlwifi_current_band(trans);
rx_status.signal = -42; // TODO(REDBEAR-WIFI): read actual RSSI from firmware RX descriptor
rx_status.rate_idx = 0; // TODO(REDBEAR-WIFI): implement Minstrel rate scaling (Linux 7.1 iwl-mvm-rs.c)
rx_status.signal = -42; /* TODO(REDBEAR-WIFI): parse firmware RX_MPDU_NOTIF descriptor.
*
* Linux 7.1 path (drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c):
* iwl_mvm_rx_mpdu_mq() → iwl_mvm_rx_mpdu() → parses iwl_rx_mpdu_desc.v3.energy_a / energy_b
* signal = -max(energy_a ? energy_a : S8_MIN, energy_b ? energy_b : S8_MIN)
* Required: fw/api/rx.h struct iwl_rx_mpdu_desc (v1/v3), notification type RX_MPDU_NOTIF (0xC1).
* Blocked by: MVM layer port. Without MVM, firmware sends raw 802.11 frames — no descriptor header.
* Workaround: fixed -42 dBm (reasonable indoor value) with rate table fallback. */
// Simple fixed-rate lookup: map RSSI ranges to MCS indices.
// Cross-referenced with Linux 7.1 iwl-mvm-rs.c rate scale table.
// Production would use Minstrel rate adaptation; this provides
// a reasonable fixed assignment for bring-up and testing.
{
int signal = rx_status.signal;
if (signal > -50)
rx_status.rate_idx = 9; // MCS 9 (highest)
else if (signal > -60)
rx_status.rate_idx = 7; // MCS 7
else if (signal > -70)
rx_status.rate_idx = 5; // MCS 5
else if (signal > -80)
rx_status.rate_idx = 3; // MCS 3
else
rx_status.rate_idx = 1; // MCS 1 (lowest)
}
if (trans->hw) {
struct sk_buff *rx_skb = dev_alloc_skb(buf->size + sizeof(rx_status) + 2U);
@@ -2324,6 +2350,10 @@ int rb_iwlwifi_linux_scan(struct pci_dev *dev, const char *ssid, char *out, unsi
for (i = 0; i < 25 && cmd.n_channels < RB_IWL_MAX_SCAN_CHANNELS; ++i)
cmd.channels[cmd.n_channels++] = (u16)(5180 + i * 5);
// 6 GHz UNII-5 channels 1-93 (5955-6415 MHz, 5 MHz spacing)
for (i = 0; i < 93 && cmd.n_channels < RB_IWL_MAX_SCAN_CHANNELS; ++i)
cmd.channels[cmd.n_channels++] = (u16)(5955 + i * 5);
trans->scan_generation = (u32)atomic_add_return(1, &rb_iwlwifi_scan_cookie);
trans->svc_flags |= RB_IWL_SVC_SCAN_ACTIVE;
trans->scan_results_count = 0;