From: Michael Chan <michael.chan@broadcom.com>
Date: Tue, 8 May 2018 03:18:38 -0400
Subject: bnxt_en: Fix firmware message delay loop regression.
Patch-mainline: v4.18-rc1
Git-commit: cc559c1ac250a6025bd4a9528e424b8da250655b
References: bsc#1086282 FATE#324873

A recent change to reduce delay granularity waiting for firmware
reponse has caused a regression.  With a tighter delay loop,
the driver may see the beginning part of the response faster.
The original 5 usec delay to wait for the rest of the message
is not long enough and some messages are detected as invalid.

Increase the maximum wait time from 5 usec to 20 usec.  Also, fix
the debug message that shows the total delay time for the response
when the message times out.  With the new logic, the delay time
is not fixed per iteration of the loop, so we define a macro to
show the total delay time.

Fixes: 9751e8e71487 ("bnxt_en: reduce timeout on initial HWRM calls")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c |   12 ++++++++----
 drivers/net/ethernet/broadcom/bnxt/bnxt.h |    7 +++++++
 2 files changed, 15 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -3504,6 +3504,8 @@ static int bnxt_hwrm_do_send_msg(struct
 		      HWRM_RESP_LEN_SFT;
 		valid = bp->hwrm_cmd_resp_addr + len - 1;
 	} else {
+		int j;
+
 		/* Check if response len is updated */
 		for (i = 0; i < tmo_count; i++) {
 			len = (le32_to_cpu(*resp_len) & HWRM_RESP_LEN_MASK) >>
@@ -3521,14 +3523,15 @@ static int bnxt_hwrm_do_send_msg(struct
 
 		if (i >= tmo_count) {
 			netdev_err(bp->dev, "Error (timeout: %d) msg {0x%x 0x%x} len:%d\n",
-				   timeout, le16_to_cpu(req->req_type),
+				   HWRM_TOTAL_TIMEOUT(i),
+				   le16_to_cpu(req->req_type),
 				   le16_to_cpu(req->seq_id), len);
 			return -1;
 		}
 
 		/* Last byte of resp contains valid bit */
 		valid = bp->hwrm_cmd_resp_addr + len - 1;
-		for (i = 0; i < 5; i++) {
+		for (j = 0; j < HWRM_VALID_BIT_DELAY_USEC; j++) {
 			/* make sure we read from updated DMA memory */
 			dma_rmb();
 			if (*valid)
@@ -3536,9 +3539,10 @@ static int bnxt_hwrm_do_send_msg(struct
 			udelay(1);
 		}
 
-		if (i >= 5) {
+		if (j >= HWRM_VALID_BIT_DELAY_USEC) {
 			netdev_err(bp->dev, "Error (timeout: %d) msg {0x%x 0x%x} len:%d v:%d\n",
-				   timeout, le16_to_cpu(req->req_type),
+				   HWRM_TOTAL_TIMEOUT(i),
+				   le16_to_cpu(req->req_type),
 				   le16_to_cpu(req->seq_id), len, *valid);
 			return -1;
 		}
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -537,6 +537,13 @@ struct rx_tpa_end_cmp_ext {
 #define HWRM_MIN_TIMEOUT		25
 #define HWRM_MAX_TIMEOUT		40
 
+#define HWRM_TOTAL_TIMEOUT(n)	(((n) <= HWRM_SHORT_TIMEOUT_COUNTER) ?	\
+	((n) * HWRM_SHORT_MIN_TIMEOUT) :				\
+	(HWRM_SHORT_TIMEOUT_COUNTER * HWRM_SHORT_MIN_TIMEOUT +		\
+	 ((n) - HWRM_SHORT_TIMEOUT_COUNTER) * HWRM_MIN_TIMEOUT))
+
+#define HWRM_VALID_BIT_DELAY_USEC	20
+
 #define BNXT_RX_EVENT	1
 #define BNXT_AGG_EVENT	2
 #define BNXT_TX_EVENT	4