diff mbox series

[V2,1/6] brcmfmac: allow credit borrowing for all access categories

Message ID 20200610152106.175257-2-chi-hsien.lin@cypress.com (mailing list archive)
State Accepted
Commit 683608bde0308b1a2143e4fce579c744e18ae229
Delegated to: Kalle Valo
Headers show
Series brcmfmac: flow control and p2p fix series | expand

Commit Message

Chi-Hsien Lin June 10, 2020, 3:21 p.m. UTC 
From: Raveendran Somu <raveendran.somu@cypress.com>

Current credit borrowing allows only the access category BE to
borrow the credits. This change is to fix the credit borrowing
logic, to make borrowing available for all access categories
and also to borrow only from the lower categories. This fixes WFA
802.11n certs 5.2.27 failures.

Signed-off-by: Raveendran Somu <raveendran.somu@cypress.com>
Signed-off-by: Jia-Shyr Chuang <joseph.chuang@cypress.com>
Signed-off-by: Chung-Hsien Hsu <stanley.hsu@cypress.com>
Signed-off-by: Chi-hsien Lin <chi-hsien.lin@cypress.com>
---
 .../broadcom/brcm80211/brcmfmac/fwsignal.c    | 61 +++++++++++--------
 1 file changed, 37 insertions(+), 24 deletions(-)

Comments

Kalle Valo July 14, 2020, 9:47 a.m. UTC | #1 
Chi-Hsien Lin <chi-hsien.lin@cypress.com> wrote:

> From: Raveendran Somu <raveendran.somu@cypress.com>
> 
> Current credit borrowing allows only the access category BE to
> borrow the credits. This change is to fix the credit borrowing
> logic, to make borrowing available for all access categories
> and also to borrow only from the lower categories. This fixes WFA
> 802.11n certs 5.2.27 failures.
> 
> Signed-off-by: Raveendran Somu <raveendran.somu@cypress.com>
> Signed-off-by: Jia-Shyr Chuang <joseph.chuang@cypress.com>
> Signed-off-by: Chung-Hsien Hsu <stanley.hsu@cypress.com>
> Signed-off-by: Chi-hsien Lin <chi-hsien.lin@cypress.com>

6 patches applied to wireless-drivers-next.git, thanks.

683608bde030 brcmfmac: allow credit borrowing for all access categories
fc4aa125974d brcmfmac: increase message buffer size for control packets
b41c232d3366 brcmfmac: reserve 2 credits for host tx control path
d843246ee761 brcmfmac: update tx status flags to sync with firmware
bbf7ae3dcb42 brcmfmac: fix throughput zero stalls on PM 1 mode due to credit map
ad96bc27032c brcmfmac: initialize the requested dwell time
diff mbox series

Patch

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
index 09701262330d..d7c36af4b566 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c
@@ -383,6 +383,7 @@  struct brcmf_fws_mac_descriptor {
 };
 
 #define BRCMF_FWS_HANGER_MAXITEMS	3072
+#define BRCMF_BORROW_RATIO			3
 
 /**
  * enum brcmf_fws_hanger_item_state - state of hanger item.
@@ -479,7 +480,8 @@  struct brcmf_fws_info {
 	u32 fifo_enqpkt[BRCMF_FWS_FIFO_COUNT];
 	int fifo_credit[BRCMF_FWS_FIFO_COUNT];
 	int init_fifo_credit[BRCMF_FWS_FIFO_COUNT];
-	int credits_borrowed[BRCMF_FWS_FIFO_AC_VO + 1];
+	int credits_borrowed[BRCMF_FWS_FIFO_AC_VO + 1]
+		[BRCMF_FWS_FIFO_AC_VO + 1];
 	int deq_node_pos[BRCMF_FWS_FIFO_COUNT];
 	u32 fifo_credit_map;
 	u32 fifo_delay_map;
@@ -1185,13 +1187,11 @@  static void brcmf_fws_return_credits(struct brcmf_fws_info *fws,
 	if (!credits)
 		return;
 
-	fws->fifo_credit_map |= 1 << fifo;
-
-	if ((fifo == BRCMF_FWS_FIFO_AC_BE) &&
-	    (fws->credits_borrowed[0])) {
+	if (fifo > BRCMF_FWS_FIFO_AC_BK &&
+	    fifo <= BRCMF_FWS_FIFO_AC_VO) {
 		for (lender_ac = BRCMF_FWS_FIFO_AC_VO; lender_ac >= 0;
 		     lender_ac--) {
-			borrowed = &fws->credits_borrowed[lender_ac];
+			borrowed = &fws->credits_borrowed[fifo][lender_ac];
 			if (*borrowed) {
 				fws->fifo_credit_map |= (1 << lender_ac);
 				fifo_credit = &fws->fifo_credit[lender_ac];
@@ -1208,7 +1208,11 @@  static void brcmf_fws_return_credits(struct brcmf_fws_info *fws,
 		}
 	}
 
-	fws->fifo_credit[fifo] += credits;
+	if (credits) {
+		fws->fifo_credit[fifo] += credits;
+		fws->fifo_credit_map |= 1 << fifo;
+	}
+
 	if (fws->fifo_credit[fifo] > fws->init_fifo_credit[fifo])
 		fws->fifo_credit[fifo] = fws->init_fifo_credit[fifo];
 
@@ -2005,27 +2009,31 @@  static void brcmf_fws_rollback_toq(struct brcmf_fws_info *fws,
 	}
 }
 
-static int brcmf_fws_borrow_credit(struct brcmf_fws_info *fws)
+static int brcmf_fws_borrow_credit(struct brcmf_fws_info *fws,
+				   int highest_lender_ac, int borrower_ac,
+				   bool borrow_all)
 {
-	int lender_ac;
+	int lender_ac, borrow_limit = 0;
 
-	if (time_after(fws->borrow_defer_timestamp, jiffies)) {
-		fws->fifo_credit_map &= ~(1 << BRCMF_FWS_FIFO_AC_BE);
-		return -ENAVAIL;
-	}
+	for (lender_ac = 0; lender_ac <= highest_lender_ac; lender_ac++) {
 
-	for (lender_ac = 0; lender_ac <= BRCMF_FWS_FIFO_AC_VO; lender_ac++) {
-		if (fws->fifo_credit[lender_ac] > 0) {
-			fws->credits_borrowed[lender_ac]++;
+		if (!borrow_all)
+			borrow_limit =
+			  fws->init_fifo_credit[lender_ac] / BRCMF_BORROW_RATIO;
+		else
+			borrow_limit = 0;
+
+		if (fws->fifo_credit[lender_ac] > borrow_limit) {
+			fws->credits_borrowed[borrower_ac][lender_ac]++;
 			fws->fifo_credit[lender_ac]--;
 			if (fws->fifo_credit[lender_ac] == 0)
 				fws->fifo_credit_map &= ~(1 << lender_ac);
-			fws->fifo_credit_map |= (1 << BRCMF_FWS_FIFO_AC_BE);
+			fws->fifo_credit_map |= (1 << borrower_ac);
 			brcmf_dbg(DATA, "borrow credit from: %d\n", lender_ac);
 			return 0;
 		}
 	}
-	fws->fifo_credit_map &= ~(1 << BRCMF_FWS_FIFO_AC_BE);
+	fws->fifo_credit_map &= ~(1 << borrower_ac);
 	return -ENAVAIL;
 }
 
@@ -2216,9 +2224,10 @@  static void brcmf_fws_dequeue_worker(struct work_struct *worker)
 			}
 			continue;
 		}
-		while ((fws->fifo_credit[fifo] > 0) ||
+
+		while ((fws->fifo_credit[fifo]) ||
 		       ((!fws->bcmc_credit_check) &&
-			(fifo == BRCMF_FWS_FIFO_BCMC))) {
+				(fifo == BRCMF_FWS_FIFO_BCMC))) {
 			skb = brcmf_fws_deq(fws, fifo);
 			if (!skb)
 				break;
@@ -2228,10 +2237,14 @@  static void brcmf_fws_dequeue_worker(struct work_struct *worker)
 			if (fws->bus_flow_blocked)
 				break;
 		}
-		if ((fifo == BRCMF_FWS_FIFO_AC_BE) &&
-		    (fws->fifo_credit[fifo] <= 0) &&
-		    (!fws->bus_flow_blocked)) {
-			while (brcmf_fws_borrow_credit(fws) == 0) {
+
+		if (fifo >= BRCMF_FWS_FIFO_AC_BE &&
+		    fifo <= BRCMF_FWS_FIFO_AC_VO &&
+		    fws->fifo_credit[fifo] == 0 &&
+		    !fws->bus_flow_blocked) {
+			while (brcmf_fws_borrow_credit(fws,
+						       fifo - 1, fifo,
+						       true) == 0) {
 				skb = brcmf_fws_deq(fws, fifo);
 				if (!skb) {
 					brcmf_fws_return_credits(fws, fifo, 1);