From e89dd0503e763b7ab0fbd894815bff68a489dc8a Mon Sep 17 00:00:00 2001
From: Michael Chan <michael.chan@broadcom.com>
Date: Sun, 22 Mar 2020 16:40:01 -0400
Subject: [PATCH 2/5] bnxt_en: Fix Priority Bytes and Packets counters in
 ethtool -S.
Git-commit: a24ec3220f369aa0b94c863b6b310685a727151c
Patch-mainline: v5.6
References: git-fixes

There is an indexing bug in determining these ethtool priority
counters.  Instead of using the queue ID to index, we need to
normalize by modulo 10 to get the index.  This index is then used
to obtain the proper CoS queue counter.  Rename bp->pri2cos to
bp->pri2cos_idx to make this more clear.

Fixes: e37fed790335 ("bnxt_en: Add ethtool -S priority counters.")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c         | 10 +++++++++-
 drivers/net/ethernet/broadcom/bnxt/bnxt.h         |  2 +-
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c |  8 ++++----
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 4871f37358da..f9ef93484ccc 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -6930,14 +6930,22 @@ static int bnxt_hwrm_port_qstats_ext(struct bnxt *bp)
 		pri2cos = &resp2->pri0_cos_queue_id;
 		for (i = 0; i < 8; i++) {
 			u8 queue_id = pri2cos[i];
+			u8 queue_idx;
 
+			/* Per port queue IDs start from 0, 10, 20, etc */
+			queue_idx = queue_id % 10;
+			if (queue_idx > BNXT_MAX_QUEUE) {
+				bp->pri2cos_valid = false;
+				goto qstats_done;
+			}
 			for (j = 0; j < bp->max_q; j++) {
 				if (bp->q_ids[j] == queue_id)
-					bp->pri2cos[i] = j;
+					bp->pri2cos_idx[i] = queue_idx;
 			}
 		}
 		bp->pri2cos_valid = 1;
 	}
+qstats_done:
 	mutex_unlock(&bp->hwrm_cmd_lock);
 	return rc;
 }
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index c1485532a415..8d874ef1179e 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1519,7 +1519,7 @@ struct bnxt {
 	int			hw_port_stats_size;
 	u16			fw_rx_stats_ext_size;
 	u16			fw_tx_stats_ext_size;
-	u8			pri2cos[8];
+	u8			pri2cos_idx[8];
 	u8			pri2cos_valid;
 
 	u16			hwrm_max_req_len;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 615e26625838..5494bbd19784 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -504,25 +504,25 @@ static void bnxt_get_ethtool_stats(struct net_device *dev,
 		if (bp->pri2cos_valid) {
 			for (i = 0; i < 8; i++, j++) {
 				long n = bnxt_rx_bytes_pri_arr[i].base_off +
-					 bp->pri2cos[i];
+					 bp->pri2cos_idx[i];
 
 				buf[j] = le64_to_cpu(*(rx_port_stats_ext + n));
 			}
 			for (i = 0; i < 8; i++, j++) {
 				long n = bnxt_rx_pkts_pri_arr[i].base_off +
-					 bp->pri2cos[i];
+					 bp->pri2cos_idx[i];
 
 				buf[j] = le64_to_cpu(*(rx_port_stats_ext + n));
 			}
 			for (i = 0; i < 8; i++, j++) {
 				long n = bnxt_tx_bytes_pri_arr[i].base_off +
-					 bp->pri2cos[i];
+					 bp->pri2cos_idx[i];
 
 				buf[j] = le64_to_cpu(*(tx_port_stats_ext + n));
 			}
 			for (i = 0; i < 8; i++, j++) {
 				long n = bnxt_tx_pkts_pri_arr[i].base_off +
-					 bp->pri2cos[i];
+					 bp->pri2cos_idx[i];
 
 				buf[j] = le64_to_cpu(*(tx_port_stats_ext + n));
 			}
-- 
2.16.4