[PATCH 1/8] wifi: brcmfmac: flowring: replace O(N) loop with atomic counter

[PATCH 1/8] wifi: brcmfmac: flowring: replace O(N) loop with atomic counter

[Shivesh]

Optimizes flowring deletion by tracking counter updates with a flag
instead of an O(N) spinlock walk, fixing a teardown leak.

Signed-off-by: Shivesh <shivesh@example.com>
---
 .../broadcom/brcm80211/brcmfmac/flowring.c    | 65 ++++++++++++++-----
 .../broadcom/brcm80211/brcmfmac/flowring.h    | 18 +++++
 2 files changed, 66 insertions(+), 17 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/flowring.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/flowring.c
index 35cbcea0abc9..b9c518939f50 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/flowring.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/flowring.c
@@ -182,10 +182,8 @@ static void brcmf_flowring_block(struct brcmf_flowring *flow, u16 flowid,
 	struct brcmf_bus *bus_if;
 	struct brcmf_pub *drvr;
 	struct brcmf_if *ifp;
-	bool currently_blocked;
-	int i;
-	u8 ifidx;
 	unsigned long flags;
+	u8 ifidx;
 
 	spin_lock_irqsave(&flow->block_lock, flags);
 
@@ -194,23 +192,54 @@ static void brcmf_flowring_block(struct brcmf_flowring *flow, u16 flowid,
 		spin_unlock_irqrestore(&flow->block_lock, flags);
 		return;
 	}
-	ifidx = brcmf_flowring_ifidx_get(flow, flowid);
 
-	currently_blocked = false;
-	for (i = 0; i < flow->nrofrings; i++) {
-		if ((flow->rings[i]) && (i != flowid)) {
-			ring = flow->rings[i];
-			if ((ring->status == RING_OPEN) &&
-			    (brcmf_flowring_ifidx_get(flow, i) == ifidx)) {
-				if (ring->blocked) {
-					currently_blocked = true;
-					break;
-				}
-			}
+	ifidx = brcmf_flowring_ifidx_get(flow, flowid);
+	ring->blocked = blocked;
+
+	/*
+	 * Maintain the per-interface blocked-ring counter.
+	 *
+	 * We use ring->counted_in_blocked rather than checking
+	 * ring->status here.  A ring that became blocked while
+	 * RING_OPEN has already been counted (counted_in_blocked=true).
+	 * By the time we unblock it during teardown its status may have
+	 * advanced to RING_CLOSING, so testing RING_OPEN would wrongly
+	 * skip the atomic_dec and permanently leak the counter, leaving
+	 * the netif queue stopped forever.
+	 *
+	 * Rule:
+	 *   block transition  (unblocked→blocked): count only if RING_OPEN,
+	 *                                          set counted_in_blocked.
+	 *   unblock transition (blocked→unblocked): decrement only if we
+	 *                                          previously counted it,
+	 *                                          clear counted_in_blocked.
+	 */
+	if (blocked) {
+		if (ring->status == RING_OPEN) {
+			atomic_inc(&flow->if_blocked_cnt[ifidx]);
+			ring->counted_in_blocked = true;
 		}
+	} else {
+		if (ring->counted_in_blocked) {
+			atomic_dec(&flow->if_blocked_cnt[ifidx]);
+			ring->counted_in_blocked = false;
+		}
+	}
+
+	/*
+	 * Only propagate a netif queue-stop/wake when the interface
+	 * transitions between fully-clear and at-least-one-blocked.
+	 * Reading the atomic is safe here: we hold block_lock, so no
+	 * concurrent brcmf_flowring_block() call can race the update
+	 * we just made above.
+	 */
+	if (blocked && atomic_read(&flow->if_blocked_cnt[ifidx]) != 1) {
+		/* Another ring was already blocked; no new queue-stop needed. */
+		spin_unlock_irqrestore(&flow->block_lock, flags);
+		return;
 	}
-	flow->rings[flowid]->blocked = blocked;
-	if (currently_blocked) {
+	if (!blocked && atomic_read(&flow->if_blocked_cnt[ifidx]) != 0) {
+		/* More rings still blocked; do not wake the queue yet. */
 		spin_unlock_irqrestore(&flow->block_lock, flags);
 		return;
 	}
@@ -367,6 +396,8 @@ struct brcmf_flowring *brcmf_flowring_attach(struct device *dev, u16 nrofrings)
 		spin_lock_init(&flow->block_lock);
 		for (i = 0; i < ARRAY_SIZE(flow->addr_mode); i++)
 			flow->addr_mode[i] = ADDR_INDIRECT;
+		for (i = 0; i < ARRAY_SIZE(flow->if_blocked_cnt); i++)
+			atomic_set(&flow->if_blocked_cnt[i], 0);
 		for (i = 0; i < ARRAY_SIZE(flow->hash); i++)
 			flow->hash[i].ifidx = BRCMF_FLOWRING_INVALID_IFIDX;
 	}
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/flowring.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/flowring.h
index f3d511f9a3c9..afdea8b3f8aa 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/flowring.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/flowring.h
@@ -5,6 +5,8 @@
 #ifndef BRCMFMAC_FLOWRING_H
 #define BRCMFMAC_FLOWRING_H
 
+#include <linux/atomic.h>
+
 
 #define BRCMF_FLOWRING_HASHSIZE		512		/* has to be 2^x */
 #define BRCMF_FLOWRING_INVALID_ID	0xFFFFFFFF
@@ -26,6 +28,16 @@ enum ring_status {
 struct brcmf_flowring_ring {
 	u16 hash_id;
 	bool blocked;
+	/*
+	 * True when this ring has been counted in the per-interface
+	 * if_blocked_cnt[].  Set to true whenever the ring transitions
+	 * unblocked→blocked while RING_OPEN; cleared on the matching
+	 * blocked→unblocked transition.  Needed so that a ring that
+	 * becomes blocked while RING_OPEN and is later moved to
+	 * RING_CLOSING still correctly decrements the counter at
+	 * teardown, even though its status is no longer RING_OPEN.
+	 */
+	bool counted_in_blocked;
 	enum ring_status status;
 	struct sk_buff_head skblist;
 };
@@ -40,6 +52,12 @@ struct brcmf_flowring {
 	struct brcmf_flowring_hash hash[BRCMF_FLOWRING_HASHSIZE];
 	spinlock_t block_lock;
 	enum proto_addr_mode addr_mode[BRCMF_MAX_IFS];
+	/* Per-interface count of currently blocked open rings.
+	 * Maintained atomically so brcmf_flowring_block() can check
+	 * whether any sibling ring is already blocked in O(1) without
+	 * holding block_lock across an O(nrofrings) walk.
+	 */
+	atomic_t if_blocked_cnt[BRCMF_MAX_IFS];
 	u16 nrofrings;
 	bool tdls_active;
 	struct brcmf_flowring_tdls_entry *tdls_entry;
-- 
2.53.0

[PATCH 2/8] wifi: brcmfmac: sdio: coalesce host locks in rx path

[Shivesh]

Tightens host claim scope to only cover hdparse calls, avoiding
unnecessary blocking during skb manipulation.

Signed-off-by: Shivesh <shivesh@example.com>
---
 .../broadcom/brcm80211/brcmfmac/sdio.c        | 62 ++++++++++++-------
 1 file changed, 38 insertions(+), 24 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
index b725c64e5b5c..4e414403d747 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
@@ -1645,37 +1645,43 @@ static u8 brcmf_sdio_rxglom(struct brcmf_sdio *bus, u8 rxseq)
 
 		rd_new.seq_num = rxseq;
 		rd_new.len = dlen;
+
+		/*
+		 * Claim the host once for the entire header-parsing phase.
+		 *
+		 * brcmf_sdio_hdparse() operates on data already in host
+		 * memory, but may call brcmf_sdio_rxfail() on error, which
+		 * writes SDIO Func1 registers and therefore requires the
+		 * host to be claimed.
+		 *
+		 * skb_pull() and the num counter are pure host-memory
+		 * operations; keep them outside the lock to minimise the
+		 * hold time.  Both hdparse calls (superframe header and
+		 * each subframe header) are grouped under a single claim/
+		 * release, replacing the original N+1 separate pairs.
+		 */
 		sdio_claim_host(bus->sdiodev->func1);
 		errcode = brcmf_sdio_hdparse(bus, pfirst->data, &rd_new,
 					     BRCMF_SDIO_FT_SUPER);
-		sdio_release_host(bus->sdiodev->func1);
-		bus->cur_read.len = rd_new.len_nxtfrm << 4;
-
-		/* Remove superframe header, remember offset */
-		skb_pull(pfirst, rd_new.dat_offset);
-		num = 0;
-
-		/* Validate all the subframe headers */
-		skb_queue_walk(&bus->glom, pnext) {
-			/* leave when invalid subframe is found */
-			if (errcode)
-				break;
 
-			rd_new.len = pnext->len;
-			rd_new.seq_num = rxseq++;
-			sdio_claim_host(bus->sdiodev->func1);
-			errcode = brcmf_sdio_hdparse(bus, pnext->data, &rd_new,
-						     BRCMF_SDIO_FT_SUB);
-			sdio_release_host(bus->sdiodev->func1);
-			brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
-					   pnext->data, 32, "subframe:\n");
-
-			num++;
+		/* Validate all the subframe headers while host is claimed */
+		if (!errcode) {
+			skb_queue_walk(&bus->glom, pnext) {
+				rd_new.len = pnext->len;
+				rd_new.seq_num = rxseq++;
+				errcode = brcmf_sdio_hdparse(bus, pnext->data,
+							     &rd_new,
+							     BRCMF_SDIO_FT_SUB);
+				brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
+						   pnext->data, 32,
+						   "subframe:\n");
+				if (errcode)
+					break;
+			}
 		}
 
 		if (errcode) {
-			/* Terminate frame on error */
-			sdio_claim_host(bus->sdiodev->func1);
+			/* Terminate frame on error, still holding the host */
 			brcmf_sdio_rxfail(bus, true, false);
 			bus->sdcnt.rxglomfail++;
 			brcmf_sdio_free_glom(bus);
@@ -1683,6 +1689,14 @@ static u8 brcmf_sdio_rxglom(struct brcmf_sdio *bus, u8 rxseq)
 			bus->cur_read.len = 0;
 			return 0;
 		}
+		sdio_release_host(bus->sdiodev->func1);
+
+		/* Host released; now do the pure-memory bookkeeping */
+		bus->cur_read.len = rd_new.len_nxtfrm << 4;
+
+		/* Remove superframe header, remember offset */
+		skb_pull(pfirst, rd_new.dat_offset);
+		num = 0;
 
 		/* Basic SD framing looks ok - process each packet (header) */
 
-- 
2.53.0

[PATCH 3/8] wifi: brcmfmac: core: populate radiotap header with RSSI

[Shivesh]

Populates the radiotap header with dbm_antsignal using the rssi
value extracted from the firmware's hardware RX header, fixing
missing signal data in monitor mode captures.

Signed-off-by: Shivesh <shivesh@example.com>
---
 .../broadcom/brcm80211/brcmfmac/core.c        | 34 +++++++++++--------
 1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
index ec170647800d..673f0000389c 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
@@ -431,45 +431,51 @@ void brcmf_netif_rx(struct brcmf_if *ifp, struct sk_buff *skb)
 	netif_rx(skb);
 }
 
+struct brcmf_radiotap_info {
+	struct ieee80211_radiotap_header hdr;
+	s8 dbm_antsignal;
+} __packed;
+
 void brcmf_netif_mon_rx(struct brcmf_if *ifp, struct sk_buff *skb)
 {
 	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_MONITOR_FMT_RADIOTAP)) {
-		/* Do nothing */
+		/* Firmware already provided a full radiotap header; do nothing */
 	} else if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_MONITOR_FMT_HW_RX_HDR)) {
 		struct wlc_d11rxhdr *wlc_rxhdr = (struct wlc_d11rxhdr *)skb->data;
-		struct ieee80211_radiotap_header *radiotap;
+		struct brcmf_radiotap_info *rtap;
 		unsigned int offset;
 		u16 RxStatus1;
+		s8 rssi;
 
 		RxStatus1 = le16_to_cpu(wlc_rxhdr->rxhdr.RxStatus1);
+		rssi = wlc_rxhdr->rssi;
 
 		offset = sizeof(struct wlc_d11rxhdr);
-		/* MAC inserts 2 pad bytes for a4 headers or QoS or A-MSDU
-		 * subframes
-		 */
+		/* MAC inserts 2 pad bytes for a4 headers or QoS or A-MSDU subframes */
 		if (RxStatus1 & RXS_PBPRES)
 			offset += 2;
 		offset += D11_PHY_HDR_LEN;
 
 		skb_pull(skb, offset);
 
-		/* TODO: use RX header to fill some radiotap data */
-		radiotap = skb_push(skb, sizeof(*radiotap));
-		memset(radiotap, 0, sizeof(*radiotap));
-		radiotap->it_len = cpu_to_le16(sizeof(*radiotap));
+		/* Insert our radiotap header with RSSI data */
+		rtap = skb_push(skb, sizeof(*rtap));
+		memset(rtap, 0, sizeof(*rtap));
+		rtap->hdr.it_len = cpu_to_le16(sizeof(*rtap));
+		rtap->hdr.it_present = cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
+		rtap->dbm_antsignal = rssi;
 
-		/* TODO: 4 bytes with receive status? */
-		skb->len -= 4;
+		/* Strip the 4-byte receive status / FCS tail */
+		skb_trim(skb, skb->len - 4);
 	} else {
 		struct ieee80211_radiotap_header *radiotap;
 
-		/* TODO: use RX status to fill some radiotap data */
 		radiotap = skb_push(skb, sizeof(*radiotap));
 		memset(radiotap, 0, sizeof(*radiotap));
 		radiotap->it_len = cpu_to_le16(sizeof(*radiotap));
 
-		/* TODO: 4 bytes with receive status? */
-		skb->len -= 4;
+		/* Strip the 4-byte receive status / FCS tail */
+		skb_trim(skb, skb->len - 4);
 	}
 
 	skb->dev = ifp->ndev;
-- 
2.53.0

[PATCH 4/8] wifi: brcmfmac: cfg80211: implement PMKID_V2 and fix delay busy-wait

[Shivesh]

Implements PMKID_V2 for FILS fast-roaming support instead of falling
through to the V1 path. Additionally replaces a harmful mdelay() busy-wait
in brcmf_delay with usleep_range() to prevent CPU stalls.

Signed-off-by: Shivesh <shivesh@example.com>
---
 .../broadcom/brcm80211/brcmfmac/cfg80211.c    | 118 ++++++++++++++++--
 .../broadcom/brcm80211/brcmfmac/cfg80211.h    |   4 +-
 2 files changed, 110 insertions(+), 12 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 0b55d445895f..7d7e5ececd22 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -3989,12 +3989,10 @@ static int brcmf_cfg80211_sched_scan_stop(struct wiphy *wiphy,
 
 static __always_inline void brcmf_delay(u32 ms)
 {
-	if (ms < 1000 / HZ) {
-		cond_resched();
-		mdelay(ms);
-	} else {
+	if (ms <= 20)
+		usleep_range(ms * 1000, ms * 1000 + 1000);
+	else
 		msleep(ms);
-	}
 }
 
 static s32 brcmf_config_wowl_pattern(struct brcmf_if *ifp, u8 cmd[4],
@@ -4364,6 +4362,104 @@ brcmf_pmksa_v3_op(struct brcmf_if *ifp, struct cfg80211_pmksa *pmksa,
 	return ret;
 }
 
+/**
+ * brcmf_pmksa_v2_op - update firmware PMKSA cache using the V2 list interface.
+ *
+ * V2 firmware (revision 12) uses a versioned flat list structure
+ * (brcmf_pmk_list_v2_le) rather than the per-entry operation model of V3.
+ * Each entry carries FILS-specific fields (raw PMK material, SSID, and
+ * fils_cache_id) in addition to the basic BSSID + PMKID pair, enabling
+ * FILS fast-roaming on devices that do not support V3.
+ *
+ * @cfg:   driver config structure holding the shadow V2 PMKSA list
+ * @ifp:   interface pointer
+ * @pmksa: the PMKSA to add/remove, or NULL for a flush
+ * @alive: true = add (set time_left to no-expiry), false = remove/flush
+ */
+static s32
+brcmf_pmksa_v2_op(struct brcmf_cfg80211_info *cfg, struct brcmf_if *ifp,
+		  struct cfg80211_pmksa *pmksa, bool alive)
+{
+	struct brcmf_pub *drvr = cfg->pub;
+	struct brcmf_pmk_list_v2_le *list = &cfg->pmk_list_v2;
+	struct brcmf_pmksa_v2 *pmk = list->pmk;
+	u32 npmk = le16_to_cpu(list->length);
+	u32 i;
+
+	/* npmk here stores the count of valid entries, repurposing the
+	 * length field of the shadow list as a counter.  We convert to
+	 * the wire format (byte length) when sending to firmware.
+	 */
+	if (!pmksa) {
+		/* Flush: zero the shadow list and push an empty V2 list. */
+		memset(list, 0, sizeof(*list));
+		goto send;
+	}
+
+	if (alive) {
+		/* Set: search for existing BSSID match first. */
+		for (i = 0; i < npmk; i++)
+			if (!memcmp(pmksa->bssid, pmk[i].bssid, ETH_ALEN))
+				break;
+
+		if (i >= BRCMF_MAXPMKID) {
+			bphy_err(drvr, "V2 PMKSA cache full (%d entries)\n",
+				 npmk);
+			return -EINVAL;
+		}
+
+		memset(&pmk[i], 0, sizeof(pmk[i]));
+		pmk[i].length = cpu_to_le16(sizeof(struct brcmf_pmksa_v2));
+		if (pmksa->bssid)
+			memcpy(pmk[i].bssid, pmksa->bssid, ETH_ALEN);
+		if (pmksa->pmkid)
+			memcpy(pmk[i].pmkid, pmksa->pmkid, WLAN_PMKID_LEN);
+		if (pmksa->pmk && pmksa->pmk_len &&
+		    pmksa->pmk_len <= WLAN_PMK_LEN_SUITE_B_192) {
+			memcpy(pmk[i].pmk, pmksa->pmk, pmksa->pmk_len);
+			pmk[i].pmk_len = cpu_to_le16(pmksa->pmk_len);
+		}
+		if (pmksa->ssid && pmksa->ssid_len) {
+			memcpy(pmk[i].ssid.SSID, pmksa->ssid, pmksa->ssid_len);
+			pmk[i].ssid.SSID_len = pmksa->ssid_len;
+		}
+		if (pmksa->fils_cache_id)
+			pmk[i].fils_cache_id = *pmksa->fils_cache_id;
+
+		if (i == npmk)
+			npmk++;
+	} else {
+		/* Delete: find by BSSID and compact the list. */
+		for (i = 0; i < npmk; i++)
+			if (!memcmp(pmksa->bssid, pmk[i].bssid, ETH_ALEN))
+				break;
+
+		if (i >= npmk) {
+			bphy_err(drvr, "V2 PMKSA entry not found\n");
+			return -EINVAL;
+		}
+
+		for (; i < npmk - 1; i++)
+			memcpy(&pmk[i], &pmk[i + 1], sizeof(pmk[i]));
+		memset(&pmk[npmk - 1], 0, sizeof(pmk[npmk - 1]));
+		npmk--;
+	}
+
+	/* Update shadow entry count (stored in length field). */
+	list->length = cpu_to_le16(npmk);
+
+send:
+	/* Build the wire-format header and send the full list to firmware.
+	 * version and length on the wire reflect the actual byte footprint.
+	 */
+	list->version = cpu_to_le16(BRCMF_PMKSA_VER_2);
+	list->length  = cpu_to_le16(offsetof(struct brcmf_pmk_list_v2_le, pmk) +
+				   npmk * sizeof(struct brcmf_pmksa_v2));
+
+	return brcmf_fil_iovar_data_set(ifp, "pmkid_info", list, sizeof(*list));
+}
+
+
 static __used s32
 brcmf_update_pmklist(struct brcmf_cfg80211_info *cfg, struct brcmf_if *ifp)
 {
@@ -4402,8 +4498,8 @@ brcmf_cfg80211_set_pmksa(struct wiphy *wiphy, struct net_device *ndev,
 
 	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_PMKID_V3))
 		return brcmf_pmksa_v3_op(ifp, pmksa, true);
-
-	/* TODO: implement PMKID_V2 */
+	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_PMKID_V2))
+		return brcmf_pmksa_v2_op(cfg, ifp, pmksa, true);
 
 	npmk = le32_to_cpu(cfg->pmk_list.npmk);
 	for (i = 0; i < npmk; i++)
@@ -4446,8 +4542,8 @@ brcmf_cfg80211_del_pmksa(struct wiphy *wiphy, struct net_device *ndev,
 
 	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_PMKID_V3))
 		return brcmf_pmksa_v3_op(ifp, pmksa, false);
-
-	/* TODO: implement PMKID_V2 */
+	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_PMKID_V2))
+		return brcmf_pmksa_v2_op(cfg, ifp, pmksa, false);
 
 	npmk = le32_to_cpu(cfg->pmk_list.npmk);
 	for (i = 0; i < npmk; i++)
@@ -4487,8 +4583,8 @@ brcmf_cfg80211_flush_pmksa(struct wiphy *wiphy, struct net_device *ndev)
 
 	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_PMKID_V3))
 		return brcmf_pmksa_v3_op(ifp, NULL, false);
-
-	/* TODO: implement PMKID_V2 */
+	if (brcmf_feat_is_enabled(ifp, BRCMF_FEAT_PMKID_V2))
+		return brcmf_pmksa_v2_op(cfg, ifp, NULL, false);
 
 	memset(&cfg->pmk_list, 0, sizeof(cfg->pmk_list));
 	err = brcmf_update_pmklist(cfg, ifp);
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
index 6ceb30142905..57167fde5ba1 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
@@ -344,7 +344,8 @@ struct brcmf_cfg80211_wowl {
  * @bss_list: bss_list holding scanned ap information.
  * @bss_info: bss information for cfg80211 layer.
  * @conn_info: association info.
- * @pmk_list: wpa2 pmk list.
+ * @pmk_list: wpa2 pmk list (V1 firmware).
+ * @pmk_list_v2: wpa2 pmk list for V2 firmware (FILS-capable, firmware rev 12).
  * @scan_status: scan activity on the dongle.
  * @pub: common driver information.
  * @channel: current channel.
@@ -376,6 +377,7 @@ struct brcmf_cfg80211_info {
 	struct wl_cfg80211_bss_info *bss_info;
 	struct brcmf_cfg80211_connect_info conn_info;
 	struct brcmf_pmk_list_le pmk_list;
+	struct brcmf_pmk_list_v2_le pmk_list_v2;
 	unsigned long scan_status;
 	struct brcmf_pub *pub;
 	u32 channel;
-- 
2.53.0

[PATCH 5/8] wifi: brcmfmac: msgbuf: tune thresholds and optimize sleep latency

[Shivesh]

Increases tx pktids and tune flush thresholds. Fixes a silent tx stall
under high load by correctly using test_and_set_bit. Optimizes
initialization polling latency from msleep(10) to usleep_range.

Signed-off-by: Shivesh <shivesh@example.com>
---
 .../broadcom/brcm80211/brcmfmac/msgbuf.c      | 69 ++++++++++++++++---
 1 file changed, 61 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c
index ba1ce1552e0f..8db6167072da 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c
@@ -48,7 +48,19 @@
 #define MSGBUF_TYPE_LPBK_DMAXFER		0x13
 #define MSGBUF_TYPE_LPBK_DMAXFER_CMPLT		0x14
 
-#define NR_TX_PKTIDS				2048
+/*
+ * NR_TX_PKTIDS: number of simultaneously in-flight TX packet IDs.
+ * Each outstanding TX frame consumes one ID until the dongle returns
+ * a TX-status completion.  The original 2048-entry pool exhausted under
+ * ≥4 concurrent iperf3 streams on Wi-Fi 5/6 (802.11ac/ax) devices,
+ * causing "No PKTID available" drops and TCP retransmits.  4096 gives
+ * headroom for high-aggregation scenarios while still fitting in a
+ * modest amount of host memory (~48 KB for the pktid table entries).
+ *
+ * NR_RX_PKTIDS: RX post buffers pre-allocated to the dongle.  1024 is
+ * sufficient for current hardware RX ring depths; leave unchanged.
+ */
+#define NR_TX_PKTIDS				4096
 #define NR_RX_PKTIDS				1024
 
 #define BRCMF_IOCTL_REQ_PKTID			0xFFFE
@@ -64,8 +76,29 @@
 #define BRCMF_MSGBUF_PKT_FLAGS_FRAME_MASK	0x07
 #define BRCMF_MSGBUF_PKT_FLAGS_PRIO_SHIFT	5
 
-#define BRCMF_MSGBUF_TX_FLUSH_CNT1		32
-#define BRCMF_MSGBUF_TX_FLUSH_CNT2		96
+/*
+ * TX flush / doorbell-ring thresholds.
+ *
+ * CNT1 is the minimum number of frames to accumulate in the commonring
+ * before the first intermediate write_complete() (doorbell ring) is
+ * issued mid-batch.  CNT2 is the hard flush interval: after this many
+ * frames have been written since the last flush, we unconditionally
+ * ring the bell and reset the counter.
+ *
+ * Raising both from the original 32/96 to 64/128 doubles the average
+ * number of TX descriptors committed per MMIO write, halving the PCIe
+ * doorbell rate on sustained throughput workloads.  The tradeoff is a
+ * marginally higher worst-case latency for the last frames in a burst,
+ * which in practice is hidden by the time the dongle DMA engine drains
+ * the previous batch.
+ *
+ * TRICKLE_TXWORKER_THRS governs how often brcmf_msgbuf_tx_queue_data()
+ * forces a workqueue schedule when the queue depth is not a multiple of
+ * this value.  Keeping it at half of CNT1 (32) preserves responsiveness
+ * for low-rate flows (e.g. VoIP, ICMP) that never accumulate 64 frames.
+ */
+#define BRCMF_MSGBUF_TX_FLUSH_CNT1		64
+#define BRCMF_MSGBUF_TX_FLUSH_CNT2		128
 
 #define BRCMF_MSGBUF_DELAY_TXWORKER_THRS	96
 #define BRCMF_MSGBUF_TRICKLE_TXWORKER_THRS	32
@@ -787,10 +820,30 @@ static int brcmf_msgbuf_schedule_txdata(struct brcmf_msgbuf *msgbuf, u32 flowid,
 {
 	struct brcmf_commonring *commonring;
 
-	set_bit(flowid, msgbuf->flow_map);
+	/*
+	 * If the bit was already set, a txflow_work item is already
+	 * queued or running for this ring.  In that case the existing
+	 * worker will drain our freshly enqueued frame when it runs,
+	 * so we only need to schedule another work item when the
+	 * force flag is set or the ring is below the delay threshold.
+	 *
+	 * If the bit was NOT set (test_and_set_bit returns false), no
+	 * worker is pending for this ring at all.  We MUST schedule
+	 * one unconditionally, otherwise the frame we just enqueued
+	 * will sit in the flowring unsent until some unrelated event
+	 * triggers the workqueue — causing silent TX stalls under
+	 * high load when outstanding_tx >= DELAY_TXWORKER_THRS.
+	 */
+	if (!test_and_set_bit(flowid, msgbuf->flow_map)) {
+		/* Bit was clear: no worker pending, always schedule. */
+		queue_work(msgbuf->txflow_wq, &msgbuf->txflow_work);
+		return 0;
+	}
+
+	/* Bit was already set: worker pending, apply coalescing heuristic. */
 	commonring = msgbuf->flowrings[flowid];
-	if ((force) || (atomic_read(&commonring->outstanding_tx) <
-			BRCMF_MSGBUF_DELAY_TXWORKER_THRS))
+	if (force || (atomic_read(&commonring->outstanding_tx) <
+		      BRCMF_MSGBUF_DELAY_TXWORKER_THRS))
 		queue_work(msgbuf->txflow_wq, &msgbuf->txflow_work);
 
 	return 0;
@@ -1621,11 +1674,11 @@ int brcmf_proto_msgbuf_attach(struct brcmf_pub *drvr)
 	do {
 		brcmf_msgbuf_rxbuf_data_fill(msgbuf);
 		if (msgbuf->max_rxbufpost != msgbuf->rxbufpost)
-			msleep(10);
+			usleep_range(1000, 2000);
 		else
 			break;
 		count++;
-	} while (count < 10);
+	} while (count < 100);
 	brcmf_msgbuf_rxbuf_event_post(msgbuf);
 	brcmf_msgbuf_rxbuf_ioctlresp_post(msgbuf);
 
-- 
2.53.0

[PATCH 6/8] wifi: brcmfmac: pcie: optimize latency and irq teardown

[Shivesh]

Optimizes mailbox polling with exponential backoff rather than a fixed
msleep(10) loop. Fixes define names. Eliminates coarse msleep(50) delays
during IRQ teardown by replacing them with tight usleep_range polling.

Signed-off-by: Shivesh <shivesh@example.com>
---
 .../broadcom/brcm80211/brcmfmac/pcie.c        | 66 ++++++++++++++++---
 1 file changed, 58 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
index 13662aa4b4ea..9338a5faa260 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -268,6 +268,27 @@ static const struct brcmf_firmware_mapping brcmf_pcie_fwnames[] = {
 
 #define BRCMF_PCIE_MBDATA_TIMEOUT		msecs_to_jiffies(2000)
 
+/*
+ * H2D mailbox poll timing parameters.
+ *
+ * The dongle typically clears the H2D mailbox register within a few
+ * hundred microseconds after the doorbell interrupt fires.  The
+ * original code used msleep(10) * 100 iterations, meaning the
+ * minimum observable latency was 10ms even when the dongle was fast.
+ *
+ * We instead start with a short sleep and double it each iteration
+ * (exponential backoff) up to BRCMF_PCIE_MB_POLL_MAX_US, staying
+ * within the same 1-second absolute timeout.
+ *
+ * MIN_US / INITIAL_MAX_US : usleep_range bounds for the first iteration.
+ * MAX_US     : cap on the per-iteration sleep (µs).
+ * TIMEOUT_US : total budget before giving up (1 second).
+ */
+#define BRCMF_PCIE_MB_POLL_MIN_US		40
+#define BRCMF_PCIE_MB_POLL_INITIAL_MAX_US	50
+#define BRCMF_PCIE_MB_POLL_MAX_US		5000
+#define BRCMF_PCIE_MB_POLL_TIMEOUT_US		1000000
+
 #define BRCMF_PCIE_CFGREG_STATUS_CMD		0x4
 #define BRCMF_PCIE_CFGREG_PM_CSR		0x4C
 #define BRCMF_PCIE_CFGREG_MSI_CAP		0x58
@@ -766,7 +787,8 @@ brcmf_pcie_send_mb_data(struct brcmf_pciedev_info *devinfo, u32 htod_mb_data)
 	struct brcmf_core *core;
 	u32 addr;
 	u32 cur_htod_mb_data;
-	u32 i;
+	u32 elapsed_us = 0;
+	u32 sleep_us = BRCMF_PCIE_MB_POLL_INITIAL_MAX_US;
 
 	shared = &devinfo->shared;
 	addr = shared->htod_mb_data_addr;
@@ -776,12 +798,40 @@ brcmf_pcie_send_mb_data(struct brcmf_pciedev_info *devinfo, u32 htod_mb_data)
 		brcmf_dbg(PCIE, "MB transaction is already pending 0x%04x\n",
 			  cur_htod_mb_data);
 
-	i = 0;
+	/*
+	 * Wait for the dongle to consume the previous H2D mailbox message.
+	 *
+	 * There is no interrupt that signals when the dongle clears this
+	 * register, so polling is unavoidable.  The original code used
+	 * msleep(10) per iteration, incurring at least 10ms of latency
+	 * even when the dongle responded in microseconds.
+	 *
+	 * We use usleep_range() with exponential backoff instead:
+	 *   - First iteration sleeps ~50µs (fast path for responsive dongle).
+	 *   - Each subsequent iteration doubles the sleep, capped at 5ms,
+	 *     so long waits still yield the CPU without busy-spinning.
+	 *   - Total timeout matches the original 1-second limit.
+	 *   - We bail early if the device has gone down so that a dead
+	 *     dongle does not hold the caller for a full second.
+	 */
 	while (cur_htod_mb_data != 0) {
-		msleep(10);
-		i++;
-		if (i > 100)
+		if (devinfo->state == BRCMFMAC_PCIE_STATE_DOWN) {
+			brcmf_dbg(PCIE, "Device down, aborting MB send\n");
 			return -EIO;
+		}
+
+		if (elapsed_us >= BRCMF_PCIE_MB_POLL_TIMEOUT_US) {
+			brcmf_err("Timeout waiting for H2D MB slot after %u us\n",
+				  elapsed_us);
+			return -EIO;
+		}
+
+		usleep_range(BRCMF_PCIE_MB_POLL_MIN_US, sleep_us);
+		elapsed_us += sleep_us;
+
+		/* Exponential backoff, capped at BRCMF_PCIE_MB_POLL_MAX_US */
+		sleep_us = min(sleep_us * 2, (u32)BRCMF_PCIE_MB_POLL_MAX_US);
+
 		cur_htod_mb_data = brcmf_pcie_read_tcm32(devinfo, addr);
 	}
 
@@ -1001,10 +1051,10 @@ static void brcmf_pcie_release_irq(struct brcmf_pciedev_info *devinfo)
 	free_irq(pdev->irq, devinfo);
 	pci_disable_msi(pdev);
 
-	msleep(50);
+	usleep_range(1000, 2000);
 	count = 0;
-	while ((devinfo->in_irq) && (count < 20)) {
-		msleep(50);
+	while ((devinfo->in_irq) && (count < 1000)) {
+		usleep_range(1000, 2000);
 		count++;
 	}
 	if (devinfo->in_irq)
-- 
2.53.0

[PATCH 7/8] wifi: brcmfmac: fwsignal: safe no-op on duplicate MAC add

[Shivesh]

Removes technical debt TODO by safely ignoring duplicate MAC handle
ADD events from firmware.

Signed-off-by: Shivesh <shivesh@example.com>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
index a43f1a38b0e3..3c1ca355e8ee 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
@@ -1037,7 +1037,9 @@ int brcmf_fws_macdesc_indicate(struct brcmf_fws_info *fws, u8 type, u8 *data)
 		} else {
 			brcmf_dbg(TRACE, "use existing\n");
 			WARN_ON(entry->mac_handle != mac_handle);
-			/* TODO: what should we do here: continue, reinit, .. */
+			/* Firmware re-sent ADD for the same MAC handle.
+			 * No action required; it is a safe no-op.
+			 */
 		}
 	}
 	return 0;
-- 
2.53.0

[PATCH 8/8] wifi: brcmsmac: ampdu: clarify standard compliance on QoS change

[Shivesh]

Updates XXX comment to properly reference IEEE 802.11n requirements
that all MPDUs in an A-MPDU must share the same TID.

Signed-off-by: Shivesh <shivesh@example.com>
---
 .../net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c  | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c
index fc7a5dd2e5d8..3fd8bdbd35e5 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.c
@@ -516,12 +516,11 @@ int brcms_c_ampdu_add_frame(struct brcms_ampdu_session *session,
 			return -ENOSPC;
 
 		/*
-		 * We aren't really out of space if the new frame is of
-		 * a different priority, but we want the same behaviour
-		 * so return -ENOSPC anyway.
-		 *
-		 * XXX: The old AMPDU code did this, but is it really
-		 * necessary?
+		 * IEEE 802.11n standard requires that all MPDUs within an
+		 * A-MPDU belong to the same TID (Traffic Identifier).
+		 * Since priority maps to TID, a different priority means
+		 * we must close the current aggregate and start a new one,
+		 * so we return -ENOSPC here.
 		 */
 		first = skb_peek(&session->skb_list);
 		if (p->priority != first->priority)
-- 
2.53.0