idpf: add SRIOV support and other ndo_ops

Add support for SRIOV: send the requested number of VFs
to the device Control Plane, via the virtchnl message
and then enable the VFs using 'pci_enable_sriov'.

Add other ndo ops supported by the driver such as features_check,
set_rx_mode, validate_addr, set_mac_address, change_mtu, get_stats64,
set_features, and tx_timeout. Initialize the statistics task which
requests the queue related statistics to the CP. Add loopback
and promiscuous mode support and the respective virtchnl messages.

Finally, add documentation and build support for the driver.

Signed-off-by: Joshua Hay <joshua.a.hay@intel.com>
Co-developed-by: Alan Brady <alan.brady@intel.com>
Signed-off-by: Alan Brady <alan.brady@intel.com>
Co-developed-by: Madhu Chittim <madhu.chittim@intel.com>
Signed-off-by: Madhu Chittim <madhu.chittim@intel.com>
Co-developed-by: Phani Burra <phani.r.burra@intel.com>
Signed-off-by: Phani Burra <phani.r.burra@intel.com>
Reviewed-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Co-developed-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Author: jahay1

Documentation/networking/device_drivers/ethernet/index.rst

@@ -32,6 +32,7 @@ Contents:
    intel/e1000
    intel/e1000e
    intel/fm10k
+   intel/idpf
    intel/igb
    intel/igbvf
    intel/ixgbe

Documentation/networking/device_drivers/ethernet/intel/idpf.rst

@@ -0,0 +1,160 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+==========================================================================
+idpf Linux* Base Driver for the Intel(R) Infrastructure Data Path Function
+==========================================================================
+
+Intel idpf Linux driver.
+Copyright(C) 2023 Intel Corporation.
+
+.. contents::
+
+The idpf driver serves as both the Physical Function (PF) and Virtual Function
+(VF) driver for the Intel(R) Infrastructure Data Path Function.
+
+Driver information can be obtained using ethtool, lspci, and ip.
+
+For questions related to hardware requirements, refer to the documentation
+supplied with your Intel adapter. All hardware requirements listed apply to use
+with Linux.
+
+
+Identifying Your Adapter
+========================
+For information on how to identify your adapter, and for the latest Intel
+network drivers, refer to the Intel Support website:
+http://www.intel.com/support
+
+
+Additional Features and Configurations
+======================================
+
+ethtool
+-------
+The driver utilizes the ethtool interface for driver configuration and
+diagnostics, as well as displaying statistical information. The latest ethtool
+version is required for this functionality. If you don't have one yet, you can
+obtain it at:
+https://kernel.org/pub/software/network/ethtool/
+
+
+Viewing Link Messages
+---------------------
+Link messages will not be displayed to the console if the distribution is
+restricting system messages. In order to see network driver link messages on
+your console, set dmesg to eight by entering the following::
+
+  # dmesg -n 8
+
+.. note::
+   This setting is not saved across reboots.
+
+
+Jumbo Frames
+------------
+Jumbo Frames support is enabled by changing the Maximum Transmission Unit (MTU)
+to a value larger than the default value of 1500.
+
+Use the ip command to increase the MTU size. For example, enter the following
+where <ethX> is the interface number::
+
+  # ip link set mtu 9000 dev <ethX>
+  # ip link set up dev <ethX>
+
+.. note::
+   The maximum MTU setting for jumbo frames is 9706. This corresponds to the
+   maximum jumbo frame size of 9728 bytes.
+
+.. note::
+   This driver will attempt to use multiple page sized buffers to receive
+   each jumbo packet. This should help to avoid buffer starvation issues when
+   allocating receive packets.
+
+.. note::
+   Packet loss may have a greater impact on throughput when you use jumbo
+   frames. If you observe a drop in performance after enabling jumbo frames,
+   enabling flow control may mitigate the issue.
+
+
+Performance Optimization
+========================
+Driver defaults are meant to fit a wide variety of workloads, but if further
+optimization is required, we recommend experimenting with the following
+settings.
+
+
+Interrupt Rate Limiting
+-----------------------
+This driver supports an adaptive interrupt throttle rate (ITR) mechanism that
+is tuned for general workloads. The user can customize the interrupt rate
+control for specific workloads, via ethtool, adjusting the number of
+microseconds between interrupts.
+
+To set the interrupt rate manually, you must disable adaptive mode::
+
+  # ethtool -C <ethX> adaptive-rx off adaptive-tx off
+
+For lower CPU utilization:
+ - Disable adaptive ITR and lower Rx and Tx interrupts. The examples below
+   affect every queue of the specified interface.
+
+ - Setting rx-usecs and tx-usecs to 80 will limit interrupts to about
+   12,500 interrupts per second per queue::
+
+     # ethtool -C <ethX> adaptive-rx off adaptive-tx off rx-usecs 80
+     tx-usecs 80
+
+For reduced latency:
+ - Disable adaptive ITR and ITR by setting rx-usecs and tx-usecs to 0
+   using ethtool::
+
+     # ethtool -C <ethX> adaptive-rx off adaptive-tx off rx-usecs 0
+     tx-usecs 0
+
+Per-queue interrupt rate settings:
+ - The following examples are for queues 1 and 3, but you can adjust other
+   queues.
+
+ - To disable Rx adaptive ITR and set static Rx ITR to 10 microseconds or
+   about 100,000 interrupts/second, for queues 1 and 3::
+
+     # ethtool --per-queue <ethX> queue_mask 0xa --coalesce adaptive-rx off
+     rx-usecs 10
+
+ - To show the current coalesce settings for queues 1 and 3::
+
+     # ethtool --per-queue <ethX> queue_mask 0xa --show-coalesce
+
+
+
+Virtualized Environments
+------------------------
+In addition to the other suggestions in this section, the following may be
+helpful to optimize performance in VMs.
+
+ - Using the appropriate mechanism (vcpupin) in the VM, pin the CPUs to
+   individual LCPUs, making sure to use a set of CPUs included in the
+   device's local_cpulist: /sys/class/net/<ethX>/device/local_cpulist.
+
+ - Configure as many Rx/Tx queues in the VM as available. (See the idpf driver
+   documentation for the number of queues supported.) For example::
+
+     # ethtool -L <virt_interface> rx <max> tx <max>
+
+
+Support
+=======
+For general information, go to the Intel support website at:
+http://www.intel.com/support/
+
+If an issue is identified with the released source code on a supported kernel
+with a supported adapter, email the specific information related to the issue
+to intel-wired-lan@lists.osuosl.org.
+
+
+Trademarks
+==========
+Intel is a trademark or registered trademark of Intel Corporation or its
+subsidiaries in the United States and/or other countries.
+
+* Other names and brands may be claimed as the property of others.

drivers/net/ethernet/intel/Kconfig

@@ -355,5 +355,17 @@ config IGC
 
 	  To compile this driver as a module, choose M here. The module
 	  will be called igc.
+config IDPF
+	tristate "Intel(R) Infrastructure Data Path Function Support"
+	depends on PCI_MSI
+	select DIMLIB
+	select PAGE_POOL
+	select PAGE_POOL_STATS
+	help
+	  This driver supports Intel(R) Infrastructure Data Path Function
+	  devices.
+
+	  To compile this driver as a module, choose M here. The module
+	  will be called idpf.
 
 endif # NET_VENDOR_INTEL

drivers/net/ethernet/intel/Makefile

@@ -15,3 +15,4 @@ obj-$(CONFIG_I40E) += i40e/
 obj-$(CONFIG_IAVF) += iavf/
 obj-$(CONFIG_FM10K) += fm10k/
 obj-$(CONFIG_ICE) += ice/
+obj-$(CONFIG_IDPF) += idpf/

drivers/net/ethernet/intel/idpf/idpf.h

@@ -147,13 +147,17 @@ enum idpf_vport_state {
  * @vport_id: Vport identifier
  * @vport_idx: Relative vport index
  * @state: See enum idpf_vport_state
+ * @netstats: Packet and byte stats
+ * @stats_lock: Lock to protect stats update
  */
 struct idpf_netdev_priv {
 	struct idpf_adapter *adapter;
 	struct idpf_vport *vport;
 	u32 vport_id;
 	u16 vport_idx;
 	enum idpf_vport_state state;
+	struct rtnl_link_stats64 netstats;
+	spinlock_t stats_lock;
 };
 
 /**
@@ -239,6 +243,8 @@ struct idpf_dev_ops {
 	STATE(IDPF_VC_ALLOC_VECTORS_ERR)	\
 	STATE(IDPF_VC_DEALLOC_VECTORS)		\
 	STATE(IDPF_VC_DEALLOC_VECTORS_ERR)	\
+	STATE(IDPF_VC_SET_SRIOV_VFS)		\
+	STATE(IDPF_VC_SET_SRIOV_VFS_ERR)	\
 	STATE(IDPF_VC_GET_RSS_LUT)		\
 	STATE(IDPF_VC_GET_RSS_LUT_ERR)		\
 	STATE(IDPF_VC_SET_RSS_LUT)		\
@@ -247,12 +253,16 @@ struct idpf_dev_ops {
 	STATE(IDPF_VC_GET_RSS_KEY_ERR)		\
 	STATE(IDPF_VC_SET_RSS_KEY)		\
 	STATE(IDPF_VC_SET_RSS_KEY_ERR)		\
+	STATE(IDPF_VC_GET_STATS)		\
+	STATE(IDPF_VC_GET_STATS_ERR)		\
 	STATE(IDPF_VC_ADD_MAC_ADDR)		\
 	STATE(IDPF_VC_ADD_MAC_ADDR_ERR)		\
 	STATE(IDPF_VC_DEL_MAC_ADDR)		\
 	STATE(IDPF_VC_DEL_MAC_ADDR_ERR)		\
 	STATE(IDPF_VC_GET_PTYPE_INFO)		\
 	STATE(IDPF_VC_GET_PTYPE_INFO_ERR)	\
+	STATE(IDPF_VC_LOOPBACK_STATE)		\
+	STATE(IDPF_VC_LOOPBACK_STATE_ERR)	\
 	STATE(IDPF_VC_NBITS)
 
 #define IDPF_GEN_ENUM(ENUM) ENUM,
@@ -268,10 +278,14 @@ extern const char * const idpf_vport_vc_state_str[];
  * enum idpf_vport_reset_cause - Vport soft reset causes
  * @IDPF_SR_Q_CHANGE: Soft reset queue change
  * @IDPF_SR_Q_DESC_CHANGE: Soft reset descriptor change
+ * @IDPF_SR_MTU_CHANGE: Soft reset MTU change
+ * @IDPF_SR_RSC_CHANGE: Soft reset RSC change
  */
 enum idpf_vport_reset_cause {
 	IDPF_SR_Q_CHANGE,
 	IDPF_SR_Q_DESC_CHANGE,
+	IDPF_SR_MTU_CHANGE,
+	IDPF_SR_RSC_CHANGE,
 };
 
 /**
@@ -402,6 +416,19 @@ struct idpf_vport {
 	struct mutex vc_buf_lock;
 };
 
+/**
+ * enum idpf_user_flags
+ * @__IDPF_PROMISC_UC: Unicast promiscuous mode
+ * @__IDPF_PROMISC_MC: Multicast promiscuous mode
+ * @__IDPF_USER_FLAGS_NBITS: Must be last
+ */
+enum idpf_user_flags {
+	__IDPF_PROMISC_UC = 32,
+	__IDPF_PROMISC_MC,
+
+	__IDPF_USER_FLAGS_NBITS,
+};
+
 /**
  * struct idpf_rss_data - Associated RSS data
  * @rss_key_size: Size of RSS hash key
@@ -428,6 +455,7 @@ struct idpf_rss_data {
  *		      ethtool
  * @num_req_rxq_desc: Number of user requested RX queue descriptors through
  *		      ethtool
+ * @user_flags: User toggled config flags
  * @mac_filter_list: List of MAC filters
  *
  * Used to restore configuration after a reset as the vport will get wiped.
@@ -438,6 +466,7 @@ struct idpf_vport_user_config_data {
 	u16 num_req_rx_qs;
 	u32 num_req_txq_desc;
 	u32 num_req_rxq_desc;
+	DECLARE_BITMAP(user_flags, __IDPF_USER_FLAGS_NBITS);
 	struct list_head mac_filter_list;
 };
 
@@ -548,6 +577,7 @@ struct idpf_vport_config {
  * @mb_vector: Mailbox vector data
  * @vector_stack: Stack to store the msix vector indexes
  * @irq_mb_handler: Handler for hard interrupt for mailbox
+ * @tx_timeout_count: Number of TX timeouts that have occurred
  * @avail_queues: Device given queue limits
  * @vports: Array to store vports created by the driver
  * @netdevs: Associated Vport netdevs
@@ -566,6 +596,8 @@ struct idpf_vport_config {
  * @mbx_wq: Workqueue for mailbox responses
  * @vc_event_task: Task to handle out of band virtchnl event notifications
  * @vc_event_wq: Workqueue for virtchnl events
+ * @stats_task: Periodic statistics retrieval task
+ * @stats_wq: Workqueue for statistics task
  * @caps: Negotiated capabilities with device
  * @vchnl_wq: Wait queue for virtchnl messages
  * @vc_state: Virtchnl message state
@@ -601,6 +633,7 @@ struct idpf_adapter {
 	struct idpf_vector_lifo vector_stack;
 	irqreturn_t (*irq_mb_handler)(int irq, void *data);
 
+	u32 tx_timeout_count;
 	struct idpf_avail_queue_info avail_queues;
 	struct idpf_vport **vports;
 	struct net_device **netdevs;
@@ -621,6 +654,8 @@ struct idpf_adapter {
 	struct workqueue_struct *mbx_wq;
 	struct delayed_work vc_event_task;
 	struct workqueue_struct *vc_event_wq;
+	struct delayed_work stats_task;
+	struct workqueue_struct *stats_wq;
 	struct virtchnl2_get_capabilities caps;
 
 	wait_queue_head_t vchnl_wq;
@@ -825,6 +860,15 @@ static inline bool idpf_is_feature_ena(const struct idpf_vport *vport,
 	return vport->netdev->features & feature;
 }
 
+/**
+ * idpf_get_max_tx_hdr_size -- get the size of tx header
+ * @adapter: Driver specific private structure
+ */
+static inline u16 idpf_get_max_tx_hdr_size(struct idpf_adapter *adapter)
+{
+	return le16_to_cpu(adapter->caps.max_tx_hdr_size);
+}
+
 /**
  * idpf_vport_ctrl_lock - Acquire the vport control lock
  * @netdev: Network interface device structure
@@ -850,6 +894,7 @@ static inline void idpf_vport_ctrl_unlock(struct net_device *netdev)
 	mutex_unlock(&np->adapter->vport_ctrl_lock);
 }
 
+void idpf_statistics_task(struct work_struct *work);
 void idpf_init_task(struct work_struct *work);
 void idpf_service_task(struct work_struct *work);
 void idpf_mbx_task(struct work_struct *work);
@@ -865,6 +910,7 @@ int idpf_intr_req(struct idpf_adapter *adapter);
 void idpf_intr_rel(struct idpf_adapter *adapter);
 int idpf_get_reg_intr_vecs(struct idpf_vport *vport,
 			   struct idpf_vec_regs *reg_vals);
+u16 idpf_get_max_tx_hdr_size(struct idpf_adapter *adapter);
 int idpf_send_delete_queues_msg(struct idpf_vport *vport);
 int idpf_send_add_queues_msg(const struct idpf_vport *vport, u16 num_tx_q,
 			     u16 num_complq, u16 num_rx_q, u16 num_rx_bufq);
@@ -874,6 +920,7 @@ int idpf_send_enable_vport_msg(struct idpf_vport *vport);
 int idpf_send_disable_vport_msg(struct idpf_vport *vport);
 int idpf_send_destroy_vport_msg(struct idpf_vport *vport);
 int idpf_send_get_rx_ptype_msg(struct idpf_vport *vport);
+int idpf_send_ena_dis_loopback_msg(struct idpf_vport *vport);
 int idpf_send_get_set_rss_key_msg(struct idpf_vport *vport, bool get);
 int idpf_send_get_set_rss_lut_msg(struct idpf_vport *vport, bool get);
 int idpf_send_dealloc_vectors_msg(struct idpf_adapter *adapter);
@@ -883,6 +930,7 @@ int idpf_req_rel_vector_indexes(struct idpf_adapter *adapter,
 				u16 *q_vector_idxs,
 				struct idpf_vector_info *vec_info);
 int idpf_vport_alloc_vec_indexes(struct idpf_vport *vport);
+int idpf_send_get_stats_msg(struct idpf_vport *vport);
 int idpf_get_vec_ids(struct idpf_adapter *adapter,
 		     u16 *vecids, int num_vecids,
 		     struct virtchnl2_vector_chunks *chunks);
@@ -898,6 +946,9 @@ void idpf_vport_dealloc_max_qs(struct idpf_adapter *adapter,
 int idpf_add_del_mac_filters(struct idpf_vport *vport,
 			     struct idpf_netdev_priv *np,
 			     bool add, bool async);
+int idpf_set_promiscuous(struct idpf_adapter *adapter,
+			 struct idpf_vport_user_config_data *config_data,
+			 u32 vport_id);
 int idpf_send_disable_queues_msg(struct idpf_vport *vport);
 void idpf_vport_init(struct idpf_vport *vport, struct idpf_vport_max_q *max_q);
 u32 idpf_get_vport_id(struct idpf_vport *vport);