net/mlx4_core: Add bad-cable event support

If the firmware can detect a bad cable, allow it to generate an
event, and print the problem in the log.

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 43 insertions, 2 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c
index 2f2e6067426d..4df006d8afa4 100644
--- a/drivers/net/ethernet/mellanox/mlx4/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx4/eq.c
@@ -88,6 +88,8 @@ static u64 get_async_ev_mask(struct mlx4_dev *dev)
         u64 async_ev_mask = MLX4_ASYNC_EVENT_MASK;
         if (dev->caps.flags & MLX4_DEV_CAP_FLAG_PORT_MNG_CHG_EV)
                 async_ev_mask |= (1ull << MLX4_EVENT_TYPE_PORT_MNG_CHG_EVENT);
+        if (dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_RECOVERABLE_ERROR_EVENT)
+                async_ev_mask |= (1ull << MLX4_EVENT_TYPE_RECOVERABLE_ERROR_EVENT);
 
         return async_ev_mask;
 }
@@ -736,6 +738,26 @@ static int mlx4_eq_int(struct mlx4_dev *dev, struct mlx4_eq *eq)
                                             (unsigned long) eqe);
                         break;
 
+                case MLX4_EVENT_TYPE_RECOVERABLE_ERROR_EVENT:
+                        switch (eqe->subtype) {
+                        case MLX4_RECOVERABLE_ERROR_EVENT_SUBTYPE_BAD_CABLE:
+                                mlx4_warn(dev, "Bad cable detected on port %u\n",
+                                          eqe->event.bad_cable.port);
+                                break;
+                        case MLX4_RECOVERABLE_ERROR_EVENT_SUBTYPE_UNSUPPORTED_CABLE:
+                                mlx4_warn(dev, "Unsupported cable detected\n");
+                                break;
+                        default:
+                                mlx4_dbg(dev,
+                                         "Unhandled recoverable error event detected: %02x(%02x) on EQ %d at index %u. owner=%x, nent=0x%x, ownership=%s\n",
+                                         eqe->type, eqe->subtype, eq->eqn,
+                                         eq->cons_index, eqe->owner, eq->nent,
+                                         !!(eqe->owner & 0x80) ^
+                                         !!(eq->cons_index & eq->nent) ? "HW" : "SW");
+                                break;
+                        }
+                        break;
+
                 case MLX4_EVENT_TYPE_EEC_CATAS_ERROR:
                 case MLX4_EVENT_TYPE_ECC_DETECT:
                 default:
diff --git a/drivers/net/ethernet/mellanox/mlx4/fw.c b/drivers/net/ethernet/mellanox/mlx4/fw.c
index 982861d1df44..2eadc2882e4f 100644
--- a/drivers/net/ethernet/mellanox/mlx4/fw.c
+++ b/drivers/net/ethernet/mellanox/mlx4/fw.c
@@ -145,7 +145,8 @@ static void dump_dev_cap_flags2(struct mlx4_dev *dev, u64 flags)
                 [16] = "CONFIG DEV support",
                 [17] = "Asymmetric EQs support",
                 [18] = "More than 80 VFs support",
-                [19] = "Performance optimized for limited rule configuration flow steering support"
+                [19] = "Performance optimized for limited rule configuration flow steering support",
+                [20] = "Recoverable error events support"
         };
         int i;
 
@@ -859,6 +860,8 @@ int mlx4_QUERY_DEV_CAP(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
         MLX4_GET(field32, outbox, QUERY_DEV_CAP_ETH_BACKPL_OFFSET);
         if (field32 & (1 << 0))
                 dev_cap->flags2 |= MLX4_DEV_CAP_FLAG2_ETH_BACKPL_AN_REP;
+        if (field32 & (1 << 7))
+                dev_cap->flags2 |= MLX4_DEV_CAP_FLAG2_RECOVERABLE_ERROR_EVENT;
         MLX4_GET(field, outbox, QUERY_DEV_CAP_FW_REASSIGN_MAC);
         if (field & 1<<6)
                 dev_cap->flags2 |= MLX4_DEV_CAP_FLAG2_REASSIGN_MAC_EN;
@@ -1562,6 +1565,7 @@ int mlx4_INIT_HCA(struct mlx4_dev *dev, struct mlx4_init_hca_param *param)
 #define INIT_HCA_VXLAN_OFFSET            0x0c
 #define INIT_HCA_CACHELINE_SZ_OFFSET     0x0e
 #define INIT_HCA_FLAGS_OFFSET            0x014
+#define INIT_HCA_RECOVERABLE_ERROR_EVENT_OFFSET 0x018
 #define INIT_HCA_QPC_OFFSET              0x020
 #define  INIT_HCA_QPC_BASE_OFFSET        (INIT_HCA_QPC_OFFSET + 0x10)
 #define  INIT_HCA_LOG_QP_OFFSET          (INIT_HCA_QPC_OFFSET + 0x17)
@@ -1668,6 +1672,9 @@ int mlx4_INIT_HCA(struct mlx4_dev *dev, struct mlx4_init_hca_param *param)
                 dev->caps.userspace_caps |= MLX4_USER_DEV_CAP_LARGE_CQE;
         }
 
+        if (dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_RECOVERABLE_ERROR_EVENT)
+                *(inbox + INIT_HCA_RECOVERABLE_ERROR_EVENT_OFFSET / 4) |= cpu_to_be32(1 << 31);
+
         /* QPC/EEC/CQC/EQC/RDMARC attributes */
 
         MLX4_PUT(inbox, param->qpc_base,      INIT_HCA_QPC_BASE_OFFSET);
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 5ef54e145e4d..c95d659a39f2 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -200,7 +200,8 @@ enum {
         MLX4_DEV_CAP_FLAG2_CONFIG_DEV           = 1LL <<  16,
         MLX4_DEV_CAP_FLAG2_SYS_EQS              = 1LL <<  17,
         MLX4_DEV_CAP_FLAG2_80_VFS               = 1LL <<  18,
-        MLX4_DEV_CAP_FLAG2_FS_A0                = 1LL <<  19
+        MLX4_DEV_CAP_FLAG2_FS_A0                = 1LL <<  19,
+        MLX4_DEV_CAP_FLAG2_RECOVERABLE_ERROR_EVENT = 1LL << 20
 };
 
 enum {
@@ -280,6 +281,7 @@ enum mlx4_event {
         MLX4_EVENT_TYPE_FATAL_WARNING      = 0x1b,
         MLX4_EVENT_TYPE_FLR_EVENT          = 0x1c,
         MLX4_EVENT_TYPE_PORT_MNG_CHG_EVENT = 0x1d,
+        MLX4_EVENT_TYPE_RECOVERABLE_ERROR_EVENT  = 0x3e,
         MLX4_EVENT_TYPE_NONE               = 0xff,
 };
 
@@ -289,6 +291,11 @@ enum {
 };
 
 enum {
+        MLX4_RECOVERABLE_ERROR_EVENT_SUBTYPE_BAD_CABLE          = 1,
+        MLX4_RECOVERABLE_ERROR_EVENT_SUBTYPE_UNSUPPORTED_CABLE  = 2,
+};
+
+enum {
         MLX4_FATAL_WARNING_SUBTYPE_WARMING = 0,
 };
 
@@ -860,6 +867,11 @@ struct mlx4_eqe {
                                 } __packed tbl_change_info;
                         } params;
                 } __packed port_mgmt_change;
+                struct {
+                        u8 reserved[3];
+                        u8 port;
+                        u32 reserved1[5];
+                } __packed bad_cable;
         }                       event;
         u8                      slave_id;
         u8                      reserved3[2];