[PATCH] net/bnxt: fix xstats get names implementation

[Lance Richardson]

When the xstats_names parameter to rte_eth_xstats_get_names()
is non-NULL and the size parameter is less than the required
number of entries, the driver must return the required size
without modifying (and over-running) the caller's xstats_names
array.

Update bnxt_dev_xstats_get_names_op() in accordance with this
requirement.

Fixes: bfb9c2260be2 ("net/bnxt: support xstats get/reset")
Cc: sta...@dpdk.org
Signed-off-by: Lance Richardson <lance.richard...@broadcom.com>
---
 drivers/net/bnxt/bnxt_stats.c | 93 +++++++++++++++++------------------
 1 file changed, 46 insertions(+), 47 deletions(-)

diff --git a/drivers/net/bnxt/bnxt_stats.c b/drivers/net/bnxt/bnxt_stats.c
index 991eafc644..197fd7c02b 100644
--- a/drivers/net/bnxt/bnxt_stats.c
+++ b/drivers/net/bnxt/bnxt_stats.c
@@ -846,7 +846,7 @@ int bnxt_flow_stats_cnt(struct bnxt *bp)
 
 int bnxt_dev_xstats_get_names_op(struct rte_eth_dev *eth_dev,
                struct rte_eth_xstat_name *xstats_names,
-               __rte_unused unsigned int limit)
+               unsigned int size)
 {
        struct bnxt *bp = (struct bnxt *)eth_dev->data->dev_private;
        const unsigned int stat_cnt = RTE_DIM(bnxt_rx_stats_strings) +
@@ -862,63 +862,62 @@ int bnxt_dev_xstats_get_names_op(struct rte_eth_dev 
*eth_dev,
        if (rc)
                return rc;
 
-       if (xstats_names != NULL) {
-               count = 0;
+       if (xstats_names == NULL || size < stat_cnt)
+               return stat_cnt;
 
-               for (i = 0; i < RTE_DIM(bnxt_rx_stats_strings); i++) {
-                       strlcpy(xstats_names[count].name,
-                               bnxt_rx_stats_strings[i].name,
-                               sizeof(xstats_names[count].name));
-                       count++;
-               }
+       for (i = 0; i < RTE_DIM(bnxt_rx_stats_strings); i++) {
+               strlcpy(xstats_names[count].name,
+                       bnxt_rx_stats_strings[i].name,
+                       sizeof(xstats_names[count].name));
+               count++;
+       }
 
-               for (i = 0; i < RTE_DIM(bnxt_tx_stats_strings); i++) {
-                       strlcpy(xstats_names[count].name,
-                               bnxt_tx_stats_strings[i].name,
-                               sizeof(xstats_names[count].name));
-                       count++;
-               }
+       for (i = 0; i < RTE_DIM(bnxt_tx_stats_strings); i++) {
+               strlcpy(xstats_names[count].name,
+                       bnxt_tx_stats_strings[i].name,
+                       sizeof(xstats_names[count].name));
+               count++;
+       }
 
-               for (i = 0; i < RTE_DIM(bnxt_func_stats_strings); i++) {
-                       strlcpy(xstats_names[count].name,
-                               bnxt_func_stats_strings[i].name,
-                               sizeof(xstats_names[count].name));
-                       count++;
-               }
+       for (i = 0; i < RTE_DIM(bnxt_func_stats_strings); i++) {
+               strlcpy(xstats_names[count].name,
+                       bnxt_func_stats_strings[i].name,
+                       sizeof(xstats_names[count].name));
+               count++;
+       }
 
-               for (i = 0; i < RTE_DIM(bnxt_rx_ext_stats_strings); i++) {
-                       strlcpy(xstats_names[count].name,
-                               bnxt_rx_ext_stats_strings[i].name,
-                               sizeof(xstats_names[count].name));
+       for (i = 0; i < RTE_DIM(bnxt_rx_ext_stats_strings); i++) {
+               strlcpy(xstats_names[count].name,
+                       bnxt_rx_ext_stats_strings[i].name,
+                       sizeof(xstats_names[count].name));
 
-                       count++;
-               }
+               count++;
+       }
 
-               for (i = 0; i < RTE_DIM(bnxt_tx_ext_stats_strings); i++) {
-                       strlcpy(xstats_names[count].name,
-                               bnxt_tx_ext_stats_strings[i].name,
-                               sizeof(xstats_names[count].name));
+       for (i = 0; i < RTE_DIM(bnxt_tx_ext_stats_strings); i++) {
+               strlcpy(xstats_names[count].name,
+                       bnxt_tx_ext_stats_strings[i].name,
+                       sizeof(xstats_names[count].name));
 
-                       count++;
-               }
+               count++;
+       }
 
-               if (bp->fw_cap & BNXT_FW_CAP_ADV_FLOW_COUNTERS &&
-                   bp->fw_cap & BNXT_FW_CAP_ADV_FLOW_MGMT &&
-                   BNXT_FLOW_XSTATS_EN(bp)) {
-                       for (i = 0; i < bp->max_l2_ctx; i++) {
-                               char buf[RTE_ETH_XSTATS_NAME_SIZE];
+       if (bp->fw_cap & BNXT_FW_CAP_ADV_FLOW_COUNTERS &&
+           bp->fw_cap & BNXT_FW_CAP_ADV_FLOW_MGMT &&
+           BNXT_FLOW_XSTATS_EN(bp)) {
+               for (i = 0; i < bp->max_l2_ctx; i++) {
+                       char buf[RTE_ETH_XSTATS_NAME_SIZE];
 
-                               sprintf(buf, "flow_%d_bytes", i);
-                               strlcpy(xstats_names[count].name, buf,
-                                       sizeof(xstats_names[count].name));
-                               count++;
+                       sprintf(buf, "flow_%d_bytes", i);
+                       strlcpy(xstats_names[count].name, buf,
+                               sizeof(xstats_names[count].name));
+                       count++;
 
-                               sprintf(buf, "flow_%d_packets", i);
-                               strlcpy(xstats_names[count].name, buf,
-                                       sizeof(xstats_names[count].name));
+                       sprintf(buf, "flow_%d_packets", i);
+                       strlcpy(xstats_names[count].name, buf,
+                               sizeof(xstats_names[count].name));
 
-                               count++;
-                       }
+                       count++;
                }
        }
 
-- 
2.25.1

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