[PATCH] 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 logs the last output even when the command
fails, and reads uninitialized statistics when the filter list is empty.
It also ignores the command status.

Check each restore result and log failures with the affected filter.
Only report statistics after a successful command, when all fields are
valid. Continue restoring the remaining filters after an error, preserving
the existing best-effort restore policy.

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

Signed-off-by: Artem Novikov <naa@amicon.ru>
---
 drivers/net/intel/i40e/i40e_ethdev.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/net/intel/i40e/i40e_ethdev.c b/drivers/net/intel/i40e/i40e_ethdev.c
index b6b2d291eee4f13ae59c80c5a281cee6d4be2f48..f135bd13dcfc885e030d17798159ae9b4bfb5f07 100644
--- a/drivers/net/intel/i40e/i40e_ethdev.c
+++ b/drivers/net/intel/i40e/i40e_ethdev.c
@@ -11617,6 +11617,7 @@ 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;
 
 	TAILQ_FOREACH(f, ethertype_list, rules) {
@@ -11627,18 +11628,26 @@ 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;
+		}
+
+		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