[dpdk-stable] [PATCH 19.11 9/9] net/bnxt: fix xstats get

[Kalesh A P]

From: Kalesh AP <kalesh-anakkur.purayil at broadcom.com>

[ upstream commit eac4fc71cdaa6b68dbd0e4129e5751c712501693 ]

Fix to return count in xstats get op in all cases.
Driver was returning 0 if the 'xstats' parameter being passed to
xstats_get_op was NULL. This won't work on some applications that
rely on a valid count being passed even in this case so that it can
allocate memory accordingly followed by a reissue of the xstats_get_op
to get the actual stats populated by the driver.

Fixes: 063e59ddd28e ("net/bnxt: fix crash in xstats get")

Signed-off-by: Somnath Kotur <somnath.kotur at broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil at broadcom.com>
Reviewed-by: Lance Richardson <lance.richardson at broadcom.com>
Reviewed-by: Ajit Khaparde <ajit.khaparde at broadcom.com>
---
 drivers/net/bnxt/bnxt_stats.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/net/bnxt/bnxt_stats.c b/drivers/net/bnxt/bnxt_stats.c
index 84011fc..692b096 100644
--- a/drivers/net/bnxt/bnxt_stats.c
+++ b/drivers/net/bnxt/bnxt_stats.c
@@ -465,10 +465,13 @@ int bnxt_dev_xstats_get_op(struct rte_eth_dev *eth_dev,
 	if (rc)
 		return rc;
 
-	if (xstats == NULL)
-		return 0;
+	stat_count = RTE_DIM(bnxt_rx_stats_strings) +
+		RTE_DIM(bnxt_tx_stats_strings) + 1/* For tx_drop_pkts */ +
+		RTE_DIM(bnxt_rx_ext_stats_strings) +
+		RTE_DIM(bnxt_tx_ext_stats_strings);
 
-	memset(xstats, 0, sizeof(*xstats));
+	if (n < stat_count || xstats == NULL)
+		return stat_count;
 
 	bnxt_hwrm_port_qstats(bp);
 	bnxt_hwrm_func_qstats_tx_drop(bp, 0xffff, &tx_drop_pkts);
@@ -480,14 +483,7 @@ int bnxt_dev_xstats_get_op(struct rte_eth_dev *eth_dev,
 					(bp->fw_tx_port_stats_ext_size /
 					 stat_size));
 
-	count = RTE_DIM(bnxt_rx_stats_strings) +
-		RTE_DIM(bnxt_tx_stats_strings) + 1/* For tx_drop_pkts */ +
-		RTE_DIM(bnxt_rx_ext_stats_strings) +
-		RTE_DIM(bnxt_tx_ext_stats_strings);
-	stat_count = count;
-
-	if (n < count)
-		return count;
+	memset(xstats, 0, sizeof(*xstats));
 
 	count = 0;
 	for (i = 0; i < RTE_DIM(bnxt_rx_stats_strings); i++) {
-- 
2.10.1