Hello Eli Cohen,
The patch 7fc5e9ed0777: "vdpa/mlx5: Add RX counters to debugfs" from
Nov 14, 2022, leads to the following Smatch static checker warning:
drivers/vdpa/mlx5/net/mlx5_vnet.c:1497 mlx5_vdpa_add_mac_vlan_rules()
error: uninitialized symbol 'rule'.
drivers/vdpa/mlx5/net/mlx5_vnet.c
1452 static int mlx5_vdpa_add_mac_vlan_rules(struct mlx5_vdpa_net *ndev, u8 *mac,
1453 struct macvlan_node *node)
1454 {
1455 struct mlx5_flow_destination dests[NUM_DESTS] = {};
1456 struct mlx5_flow_act flow_act = {};
1457 struct mlx5_flow_handle *rule;
1458 struct mlx5_flow_spec *spec;
1459 void *headers_c;
1460 void *headers_v;
1461 u8 *dmac_c;
1462 u8 *dmac_v;
1463 int err;
1464 u16 vid;
1465
1466 spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
1467 if (!spec)
1468 return -ENOMEM;
1469
1470 vid = key2vid(node->macvlan);
1471 spec->match_criteria_enable = MLX5_MATCH_OUTER_HEADERS;
1472 headers_c = MLX5_ADDR_OF(fte_match_param, spec->match_criteria, outer_headers);
1473 headers_v = MLX5_ADDR_OF(fte_match_param, spec->match_value, outer_headers);
1474 dmac_c = MLX5_ADDR_OF(fte_match_param, headers_c, outer_headers.dmac_47_16);
1475 dmac_v = MLX5_ADDR_OF(fte_match_param, headers_v, outer_headers.dmac_47_16);
1476 eth_broadcast_addr(dmac_c);
1477 ether_addr_copy(dmac_v, mac);
1478 if (ndev->mvdev.actual_features & BIT_ULL(VIRTIO_NET_F_CTRL_VLAN)) {
1479 MLX5_SET(fte_match_set_lyr_2_4, headers_c, cvlan_tag, 1);
1480 MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, headers_c, first_vid);
1481 }
1482 if (node->tagged) {
1483 MLX5_SET(fte_match_set_lyr_2_4, headers_v, cvlan_tag, 1);
1484 MLX5_SET(fte_match_set_lyr_2_4, headers_v, first_vid, vid);
1485 }
1486 flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
1487 dests[0].type = MLX5_FLOW_DESTINATION_TYPE_TIR;
1488 dests[0].tir_num = ndev->res.tirn;
1489 err = add_steering_counters(ndev, node, &flow_act, dests);
1490 if (err)
1491 goto out_free;
1492
1493 #if defined(CONFIG_MLX5_VDPA_STEERING_DEBUG)
1494 dests[1].counter_id = mlx5_fc_id(node->ucast_counter.counter);
1495 #endif
1496 node->ucast_rule = mlx5_add_flow_rules(ndev->rxft, spec, &flow_act, dests, NUM_DESTS);
--> 1497 if (IS_ERR(rule)) {
Checking the wrong variable. It looks like maybe the fix for this
was already posted but only some of the thread made it to lore.kernel.org
so it's impossible to tell for sure.
1498 err = PTR_ERR(rule);
1499 goto err_ucast;
1500 }
1501
1502 #if defined(CONFIG_MLX5_VDPA_STEERING_DEBUG)
1503 dests[1].counter_id = mlx5_fc_id(node->mcast_counter.counter);
1504 #endif
1505
1506 memset(dmac_c, 0, ETH_ALEN);
1507 memset(dmac_v, 0, ETH_ALEN);
1508 dmac_c[0] = 1;
1509 dmac_v[0] = 1;
1510 node->mcast_rule = mlx5_add_flow_rules(ndev->rxft, spec, &flow_act, dests, NUM_DESTS);
1511 if (IS_ERR(rule)) {
Here too.
1512 err = PTR_ERR(rule);
1513 goto err_mcast;
1514 }
1515 kvfree(spec);
1516 mlx5_vdpa_add_rx_counters(ndev, node);
1517 return 0;
1518
1519 err_mcast:
1520 mlx5_del_flow_rules(node->ucast_rule);
1521 err_ucast:
1522 remove_steering_counters(ndev, node);
1523 out_free:
1524 kvfree(spec);
1525 return err;
1526 }
regards,
dan carpenter
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