[PATCH v2] net/i40e: fix ethertype filter restore diagnostics

[Artem Novikov <naa@amicon.ru>]

The control packet filter command only fills its statistics output on
success. The restore path ignores command failures and logs statistics
even if no command succeeds. With an empty filter list, it reads
uninitialized statistics.

Check each restore result and log failures with the affected filter.
Continue restoring the remaining filters after an error. Log resource
usage once after the loop, using the last successful command's statistics,
and skip this log if no command succeeded. The command helper leaves the
statistics unchanged on failure.

Fixes: ddcd4d4dbbe0 ("net/i40e: restore ethertype filter")
Cc: stable@dpdk.org
Cc: beilei.xing@intel.com

Signed-off-by: Artem Novikov <naa@amicon.ru>
---
v2:
* Log resource statistics once, after the last successful restore.
* Keep per-filter error diagnostics and continue after failed commands.
* Keep the error format string on one line.

 drivers/net/intel/i40e/i40e_ethdev.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/net/intel/i40e/i40e_ethdev.c b/drivers/net/intel/i40e/i40e_ethdev.c
index d64d8dd7b5662cb79f52a3a256765a07588bac1e..208d72bac0d8c2acba080cb2f650084b8719ecd1 100644
--- a/drivers/net/intel/i40e/i40e_ethdev.c
+++ b/drivers/net/intel/i40e/i40e_ethdev.c
@@ -11630,7 +11630,9 @@ i40e_ethertype_filter_restore(struct i40e_pf *pf)
 		*ethertype_list = &pf->ethertype.ethertype_list;
 	struct i40e_ethertype_filter *f;
 	struct i40e_control_filter_stats stats;
+	enum i40e_status_code ret;
 	uint16_t flags;
+	bool stats_valid = false;
 
 	TAILQ_FOREACH(f, ethertype_list, rules) {
 		flags = 0;
@@ -11640,18 +11642,29 @@ i40e_ethertype_filter_restore(struct i40e_pf *pf)
 			flags |= I40E_AQC_ADD_CONTROL_PACKET_FLAGS_DROP;
 		flags |= I40E_AQC_ADD_CONTROL_PACKET_FLAGS_TO_QUEUE;
 
-		memset(&stats, 0, sizeof(stats));
-		i40e_aq_add_rem_control_packet_filter(hw,
+		ret = i40e_aq_add_rem_control_packet_filter(hw,
 					    f->input.mac_addr.addr_bytes,
 					    f->input.ether_type,
 					    flags, pf->main_vsi->seid,
 					    f->queue, 1, &stats, NULL);
+		if (ret != I40E_SUCCESS) {
+			PMD_DRV_LOG(ERR,
+				    "Failed to restore ethertype filter, ether_type=0x%04x, queue=%u, vsi_seid=%u, err %d",
+				    f->input.ether_type, f->queue,
+				    pf->main_vsi->seid, ret);
+			continue;
+		}
+
+		stats_valid = true;
+	}
+
+	if (stats_valid) {
+		PMD_DRV_LOG(INFO, "Ethertype filter:"
+			    " mac_etype_used = %u, etype_used = %u,"
+			    " mac_etype_free = %u, etype_free = %u",
+			    stats.mac_etype_used, stats.etype_used,
+			    stats.mac_etype_free, stats.etype_free);
 	}
-	PMD_DRV_LOG(INFO, "Ethertype filter:"
-		    " mac_etype_used = %u, etype_used = %u,"
-		    " mac_etype_free = %u, etype_free = %u",
-		    stats.mac_etype_used, stats.etype_used,
-		    stats.mac_etype_free, stats.etype_free);
 }
 
 /* Restore tunnel filter */
-- 
2.43.0