Merge branch 'mlxsw-fixes'

Jiri Pirko says:

====================
mlxsw: Couple of fixes/adjustments

Ido Schimmel (5):
  mlxsw: Call free_netdev when removing port
  mlxsw: Make system port to local port mapping explicit
  mlxsw: Simplify mlxsw_sx_port_xmit function
  mlxsw: Use correct skb length when dumping payload
  mlxsw: Fix use-after-free bug in mlxsw_sx_port_xmit

Jiri Pirko (2):
  mlxsw: Make pci module dependent on HAS_DMA and HAS_IOMEM
  mlxsw: Strip FCS from incoming packets
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/Kconfig

@@ -12,7 +12,7 @@ config MLXSW_CORE
 
 config MLXSW_PCI
 	tristate "PCI bus implementation for Mellanox Technologies Switch ASICs"
-	depends on PCI && MLXSW_CORE
+	depends on PCI && HAS_DMA && HAS_IOMEM && MLXSW_CORE
 	default m
 	---help---
 	  This is PCI bus implementation for Mellanox Technologies Switch ASICs.

drivers/net/ethernet/mellanox/mlxsw/core.c

@@ -865,6 +865,16 @@ static struct mlxsw_core *__mlxsw_core_get(void *driver_priv)
 	return container_of(driver_priv, struct mlxsw_core, driver_priv);
 }
 
+bool mlxsw_core_skb_transmit_busy(void *driver_priv,
+				  const struct mlxsw_tx_info *tx_info)
+{
+	struct mlxsw_core *mlxsw_core = __mlxsw_core_get(driver_priv);
+
+	return mlxsw_core->bus->skb_transmit_busy(mlxsw_core->bus_priv,
+						  tx_info);
+}
+EXPORT_SYMBOL(mlxsw_core_skb_transmit_busy);
+
 int mlxsw_core_skb_transmit(void *driver_priv, struct sk_buff *skb,
 			    const struct mlxsw_tx_info *tx_info)
 {
@@ -1063,7 +1073,7 @@ static int mlxsw_core_reg_access_emad(struct mlxsw_core *mlxsw_core,
 			mlxsw_core->emad.tid - 1);
 		mlxsw_core_buf_dump_dbg(mlxsw_core,
 					mlxsw_core->emad.resp_skb->data,
-					skb->len);
+					mlxsw_core->emad.resp_skb->len);
 
 		dev_kfree_skb(mlxsw_core->emad.resp_skb);
 	}

drivers/net/ethernet/mellanox/mlxsw/core.h

@@ -73,6 +73,9 @@ struct mlxsw_tx_info {
 	bool is_emad;
 };
 
+bool mlxsw_core_skb_transmit_busy(void *driver_priv,
+				  const struct mlxsw_tx_info *tx_info);
+
 int mlxsw_core_skb_transmit(void *driver_priv, struct sk_buff *skb,
 			    const struct mlxsw_tx_info *tx_info);
 
@@ -177,6 +180,8 @@ struct mlxsw_bus {
 	int (*init)(void *bus_priv, struct mlxsw_core *mlxsw_core,
 		    const struct mlxsw_config_profile *profile);
 	void (*fini)(void *bus_priv);
+	bool (*skb_transmit_busy)(void *bus_priv,
+				  const struct mlxsw_tx_info *tx_info);
 	int (*skb_transmit)(void *bus_priv, struct sk_buff *skb,
 			    const struct mlxsw_tx_info *tx_info);
 	int (*cmd_exec)(void *bus_priv, u16 opcode, u8 opcode_mod,

drivers/net/ethernet/mellanox/mlxsw/pci.c

@@ -667,6 +667,7 @@ static void mlxsw_pci_cqe_rdq_handle(struct mlxsw_pci *mlxsw_pci,
 	char *wqe;
 	struct sk_buff *skb;
 	struct mlxsw_rx_info rx_info;
+	u16 byte_count;
 	int err;
 
 	elem_info = mlxsw_pci_queue_elem_info_consumer_get(q);
@@ -686,7 +687,10 @@ static void mlxsw_pci_cqe_rdq_handle(struct mlxsw_pci *mlxsw_pci,
 	rx_info.sys_port = mlxsw_pci_cqe_system_port_get(cqe);
 	rx_info.trap_id = mlxsw_pci_cqe_trap_id_get(cqe);
 
-	skb_put(skb, mlxsw_pci_cqe_byte_count_get(cqe));
+	byte_count = mlxsw_pci_cqe_byte_count_get(cqe);
+	if (mlxsw_pci_cqe_crc_get(cqe))
+		byte_count -= ETH_FCS_LEN;
+	skb_put(skb, byte_count);
 	mlxsw_core_skb_receive(mlxsw_pci->core, skb, &rx_info);
 
 put_new_skb:
@@ -1439,6 +1443,15 @@ mlxsw_pci_sdq_pick(struct mlxsw_pci *mlxsw_pci,
 	return mlxsw_pci_sdq_get(mlxsw_pci, sdqn);
 }
 
+static bool mlxsw_pci_skb_transmit_busy(void *bus_priv,
+					const struct mlxsw_tx_info *tx_info)
+{
+	struct mlxsw_pci *mlxsw_pci = bus_priv;
+	struct mlxsw_pci_queue *q = mlxsw_pci_sdq_pick(mlxsw_pci, tx_info);
+
+	return !mlxsw_pci_queue_elem_info_producer_get(q);
+}
+
 static int mlxsw_pci_skb_transmit(void *bus_priv, struct sk_buff *skb,
 				  const struct mlxsw_tx_info *tx_info)
 {
@@ -1621,11 +1634,12 @@ static int mlxsw_pci_cmd_exec(void *bus_priv, u16 opcode, u8 opcode_mod,
 }
 
 static const struct mlxsw_bus mlxsw_pci_bus = {
-	.kind		= "pci",
-	.init		= mlxsw_pci_init,
-	.fini		= mlxsw_pci_fini,
-	.skb_transmit	= mlxsw_pci_skb_transmit,
-	.cmd_exec	= mlxsw_pci_cmd_exec,
+	.kind			= "pci",
+	.init			= mlxsw_pci_init,
+	.fini			= mlxsw_pci_fini,
+	.skb_transmit_busy	= mlxsw_pci_skb_transmit_busy,
+	.skb_transmit		= mlxsw_pci_skb_transmit,
+	.cmd_exec		= mlxsw_pci_cmd_exec,
 };
 
 static int mlxsw_pci_sw_reset(struct mlxsw_pci *mlxsw_pci)

drivers/net/ethernet/mellanox/mlxsw/pci.h

@@ -155,6 +155,12 @@ MLXSW_ITEM32(pci, cqe, byte_count, 0x04, 0, 14);
  */
 MLXSW_ITEM32(pci, cqe, trap_id, 0x08, 0, 8);
 
+/* pci_cqe_crc
+ * Length include CRC. Indicates the length field includes
+ * the packet's CRC.
+ */
+MLXSW_ITEM32(pci, cqe, crc, 0x0C, 8, 1);
+
 /* pci_cqe_e
  * CQE with Error.
  */

drivers/net/ethernet/mellanox/mlxsw/reg.h

@@ -150,6 +150,64 @@ static inline void mlxsw_reg_smid_pack(char *payload, u16 mid)
 	mlxsw_reg_smid_port_mask_set(payload, MLXSW_PORT_CPU_PORT, 1);
 }
 
+/* SSPR - Switch System Port Record Register
+ * -----------------------------------------
+ * Configures the system port to local port mapping.
+ */
+#define MLXSW_REG_SSPR_ID 0x2008
+#define MLXSW_REG_SSPR_LEN 0x8
+
+static const struct mlxsw_reg_info mlxsw_reg_sspr = {
+	.id = MLXSW_REG_SSPR_ID,
+	.len = MLXSW_REG_SSPR_LEN,
+};
+
+/* reg_sspr_m
+ * Master - if set, then the record describes the master system port.
+ * This is needed in case a local port is mapped into several system ports
+ * (for multipathing). That number will be reported as the source system
+ * port when packets are forwarded to the CPU. Only one master port is allowed
+ * per local port.
+ *
+ * Note: Must be set for Spectrum.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, sspr, m, 0x00, 31, 1);
+
+/* reg_sspr_local_port
+ * Local port number.
+ *
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, sspr, local_port, 0x00, 16, 8);
+
+/* reg_sspr_sub_port
+ * Virtual port within the physical port.
+ * Should be set to 0 when virtual ports are not enabled on the port.
+ *
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, sspr, sub_port, 0x00, 8, 8);
+
+/* reg_sspr_system_port
+ * Unique identifier within the stacking domain that represents all the ports
+ * that are available in the system (external ports).
+ *
+ * Currently, only single-ASIC configurations are supported, so we default to
+ * 1:1 mapping between system ports and local ports.
+ * Access: Index
+ */
+MLXSW_ITEM32(reg, sspr, system_port, 0x04, 0, 16);
+
+static inline void mlxsw_reg_sspr_pack(char *payload, u8 local_port)
+{
+	MLXSW_REG_ZERO(sspr, payload);
+	mlxsw_reg_sspr_m_set(payload, 1);
+	mlxsw_reg_sspr_local_port_set(payload, local_port);
+	mlxsw_reg_sspr_sub_port_set(payload, 0);
+	mlxsw_reg_sspr_system_port_set(payload, local_port);
+}
+
 /* SPMS - Switch Port MSTP/RSTP State Register
  * -------------------------------------------
  * Configures the spanning tree state of a physical port.
@@ -1216,6 +1274,8 @@ static inline const char *mlxsw_reg_id_str(u16 reg_id)
 		return "SPAD";
 	case MLXSW_REG_SMID_ID:
 		return "SMID";
+	case MLXSW_REG_SSPR_ID:
+		return "SSPR";
 	case MLXSW_REG_SPMS_ID:
 		return "SPMS";
 	case MLXSW_REG_SFGC_ID:

drivers/net/ethernet/mellanox/mlxsw/switchx2.c

@@ -245,6 +245,16 @@ static int mlxsw_sx_port_swid_set(struct mlxsw_sx_port *mlxsw_sx_port, u8 swid)
 	return mlxsw_reg_write(mlxsw_sx->core, MLXSW_REG(pspa), pspa_pl);
 }
 
+static int
+mlxsw_sx_port_system_port_mapping_set(struct mlxsw_sx_port *mlxsw_sx_port)
+{
+	struct mlxsw_sx *mlxsw_sx = mlxsw_sx_port->mlxsw_sx;
+	char sspr_pl[MLXSW_REG_SSPR_LEN];
+
+	mlxsw_reg_sspr_pack(sspr_pl, mlxsw_sx_port->local_port);
+	return mlxsw_reg_write(mlxsw_sx->core, MLXSW_REG(sspr), sspr_pl);
+}
+
 static int mlxsw_sx_port_module_check(struct mlxsw_sx_port *mlxsw_sx_port,
 				      bool *p_usable)
 {
@@ -290,37 +300,34 @@ static netdev_tx_t mlxsw_sx_port_xmit(struct sk_buff *skb,
 		.local_port = mlxsw_sx_port->local_port,
 		.is_emad = false,
 	};
-	struct sk_buff *skb_old = NULL;
+	u64 len;
 	int err;
 
+	if (mlxsw_core_skb_transmit_busy(mlxsw_sx, &tx_info))
+		return NETDEV_TX_BUSY;
+
 	if (unlikely(skb_headroom(skb) < MLXSW_TXHDR_LEN)) {
-		struct sk_buff *skb_new;
+		struct sk_buff *skb_orig = skb;
 
-		skb_old = skb;
-		skb_new = skb_realloc_headroom(skb, MLXSW_TXHDR_LEN);
-		if (!skb_new) {
+		skb = skb_realloc_headroom(skb, MLXSW_TXHDR_LEN);
+		if (!skb) {
 			this_cpu_inc(mlxsw_sx_port->pcpu_stats->tx_dropped);
-			dev_kfree_skb_any(skb_old);
+			dev_kfree_skb_any(skb_orig);
 			return NETDEV_TX_OK;
 		}
-		skb = skb_new;
 	}
 	mlxsw_sx_txhdr_construct(skb, &tx_info);
+	len = skb->len;
+	/* Due to a race we might fail here because of a full queue. In that
+	 * unlikely case we simply drop the packet.
+	 */
 	err = mlxsw_core_skb_transmit(mlxsw_sx, skb, &tx_info);
-	if (err == -EAGAIN) {
-		if (skb_old)
-			dev_kfree_skb_any(skb);
-		return NETDEV_TX_BUSY;
-	}
-
-	if (skb_old)
-		dev_kfree_skb_any(skb_old);
 
 	if (!err) {
 		pcpu_stats = this_cpu_ptr(mlxsw_sx_port->pcpu_stats);
 		u64_stats_update_begin(&pcpu_stats->syncp);
 		pcpu_stats->tx_packets++;
-		pcpu_stats->tx_bytes += skb->len;
+		pcpu_stats->tx_bytes += len;
 		u64_stats_update_end(&pcpu_stats->syncp);
 	} else {
 		this_cpu_inc(mlxsw_sx_port->pcpu_stats->tx_dropped);
@@ -1001,6 +1008,13 @@ static int mlxsw_sx_port_create(struct mlxsw_sx *mlxsw_sx, u8 local_port)
 		goto port_not_usable;
 	}
 
+	err = mlxsw_sx_port_system_port_mapping_set(mlxsw_sx_port);
+	if (err) {
+		dev_err(mlxsw_sx->bus_info->dev, "Port %d: Failed to set system port mapping\n",
+			mlxsw_sx_port->local_port);
+		goto err_port_system_port_mapping_set;
+	}
+
 	err = mlxsw_sx_port_swid_set(mlxsw_sx_port, 0);
 	if (err) {
 		dev_err(mlxsw_sx->bus_info->dev, "Port %d: Failed to set SWID\n",
@@ -1061,6 +1075,7 @@ static int mlxsw_sx_port_create(struct mlxsw_sx *mlxsw_sx, u8 local_port)
 err_port_mtu_set:
 err_port_speed_set:
 err_port_swid_set:
+err_port_system_port_mapping_set:
 port_not_usable:
 err_port_module_check:
 err_dev_addr_get:
@@ -1079,6 +1094,7 @@ static void mlxsw_sx_port_remove(struct mlxsw_sx *mlxsw_sx, u8 local_port)
 	unregister_netdev(mlxsw_sx_port->dev); /* This calls ndo_stop */
 	mlxsw_sx_port_swid_set(mlxsw_sx_port, MLXSW_PORT_SWID_DISABLED_PORT);
 	free_percpu(mlxsw_sx_port->pcpu_stats);
+	free_netdev(mlxsw_sx_port->dev);
 }
 
 static void mlxsw_sx_ports_remove(struct mlxsw_sx *mlxsw_sx)