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/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
/* Copyright (C) 2015-2018 Netronome Systems, Inc. */
* nfp_net.h
* Declarations for Netronome network device driver.
* Authors: Jakub Kicinski <>
* Jason McMullan <>
* Rolf Neugebauer <>
#ifndef _NFP_NET_H_
#define _NFP_NET_H_
#include <linux/atomic.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/dim.h>
#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/semaphore.h>
#include <linux/workqueue.h>
#include <net/xdp.h>
#include "nfp_net_ctrl.h"
#define nn_pr(nn, lvl, fmt, args...) \
({ \
struct nfp_net *__nn = (nn); \
if (__nn->dp.netdev) \
netdev_printk(lvl, __nn->dp.netdev, fmt, ## args); \
else \
dev_printk(lvl, __nn->, "ctrl: " fmt, ## args); \
#define nn_err(nn, fmt, args...) nn_pr(nn, KERN_ERR, fmt, ## args)
#define nn_warn(nn, fmt, args...) nn_pr(nn, KERN_WARNING, fmt, ## args)
#define nn_info(nn, fmt, args...) nn_pr(nn, KERN_INFO, fmt, ## args)
#define nn_dbg(nn, fmt, args...) nn_pr(nn, KERN_DEBUG, fmt, ## args)
#define nn_dp_warn(dp, fmt, args...) \
({ \
struct nfp_net_dp *__dp = (dp); \
if (unlikely(net_ratelimit())) { \
if (__dp->netdev) \
netdev_warn(__dp->netdev, fmt, ## args); \
else \
dev_warn(__dp->dev, fmt, ## args); \
} \
/* Max time to wait for NFP to respond on updates (in seconds) */
/* Interval for reading offloaded filter stats */
#define NFP_NET_STAT_POLL_IVL msecs_to_jiffies(100)
/* Bar allocation */
#define NFP_NET_CTRL_BAR 0
#define NFP_NET_Q0_BAR 2
#define NFP_NET_Q1_BAR 4 /* OBSOLETE */
/* Max bits in DMA address */
/* Default size for MTU and freelist buffer sizes */
/* Maximum number of bytes prepended to a packet */
/* Interrupt definitions */
/* Queue/Ring definitions */
#define NFP_NET_MAX_TX_RINGS 64 /* Max. # of Tx rings per device */
#define NFP_NET_MAX_RX_RINGS 64 /* Max. # of Rx rings per device */
#define NFP_NET_MIN_TX_DESCS 256 /* Min. # of Tx descs per ring */
#define NFP_NET_MIN_RX_DESCS 256 /* Min. # of Rx descs per ring */
#define NFP_NET_MAX_TX_DESCS (256 * 1024) /* Max. # of Tx descs per ring */
#define NFP_NET_MAX_RX_DESCS (256 * 1024) /* Max. # of Rx descs per ring */
#define NFP_NET_TX_DESCS_DEFAULT 4096 /* Default # of Tx descs per ring */
#define NFP_NET_RX_DESCS_DEFAULT 4096 /* Default # of Rx descs per ring */
#define NFP_NET_FL_BATCH 16 /* Add freelist in this Batch size */
#define NFP_NET_XDP_MAX_COMPLETE 2048 /* XDP bufs to reclaim in NAPI poll */
/* Offload definitions */
#define NFP_NET_N_VXLAN_PORTS (NFP_NET_CFG_VXLAN_SZ / sizeof(__be16))
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
/* Forward declarations */
struct nfp_cpp;
struct nfp_eth_table_port;
struct nfp_net;
struct nfp_net_r_vector;
struct nfp_port;
/* Convenience macro for wrapping descriptor index on ring size */
#define D_IDX(ring, idx) ((idx) & ((ring)->cnt - 1))
/* Convenience macro for writing dma address into RX/TX descriptors */
#define nfp_desc_set_dma_addr(desc, dma_addr) \
do { \
__typeof(desc) __d = (desc); \
dma_addr_t __addr = (dma_addr); \
__d->dma_addr_lo = cpu_to_le32(lower_32_bits(__addr)); \
__d->dma_addr_hi = upper_32_bits(__addr) & 0xff; \
} while (0)
/* TX descriptor format */
/* Flags in the host TX descriptor */
struct nfp_net_tx_desc {
union {
struct {
u8 dma_addr_hi; /* High bits of host buf address */
__le16 dma_len; /* Length to DMA for this desc */
u8 offset_eop; /* Offset in buf where pkt starts +
* highest bit is eop flag.
__le32 dma_addr_lo; /* Low 32bit of host buf addr */
__le16 mss; /* MSS to be used for LSO */
u8 lso_hdrlen; /* LSO, TCP payload offset */
u8 flags; /* TX Flags, see @PCIE_DESC_TX_* */
union {
struct {
u8 l3_offset; /* L3 header offset */
u8 l4_offset; /* L4 header offset */
__le16 vlan; /* VLAN tag to add if indicated */
__le16 data_len; /* Length of frame + meta data */
} __packed;
__le32 vals[4];
__le64 vals8[2];
* struct nfp_net_tx_buf - software TX buffer descriptor
* @skb: normal ring, sk_buff associated with this buffer
* @frag: XDP ring, page frag associated with this buffer
* @dma_addr: DMA mapping address of the buffer
* @fidx: Fragment index (-1 for the head and [0..nr_frags-1] for frags)
* @pkt_cnt: Number of packets to be produced out of the skb associated
* with this buffer (valid only on the head's buffer).
* Will be 1 for all non-TSO packets.
* @real_len: Number of bytes which to be produced out of the skb (valid only
* on the head's buffer). Equal to skb->len for non-TSO packets.
struct nfp_net_tx_buf {
union {
struct sk_buff *skb;
void *frag;
dma_addr_t dma_addr;
short int fidx;
u16 pkt_cnt;
u32 real_len;
* struct nfp_net_tx_ring - TX ring structure
* @r_vec: Back pointer to ring vector structure
* @idx: Ring index from Linux's perspective
* @qcidx: Queue Controller Peripheral (QCP) queue index for the TX queue
* @qcp_q: Pointer to base of the QCP TX queue
* @cnt: Size of the queue in number of descriptors
* @wr_p: TX ring write pointer (free running)
* @rd_p: TX ring read pointer (free running)
* @qcp_rd_p: Local copy of QCP TX queue read pointer
* @wr_ptr_add: Accumulated number of buffers to add to QCP write pointer
* (used for .xmit_more delayed kick)
* @txbufs: Array of transmitted TX buffers, to free on transmit
* @txds: Virtual address of TX ring in host memory
* @dma: DMA address of the TX ring
* @size: Size, in bytes, of the TX ring (needed to free)
* @is_xdp: Is this a XDP TX ring?
struct nfp_net_tx_ring {
struct nfp_net_r_vector *r_vec;
u32 idx;
int qcidx;
u8 __iomem *qcp_q;
u32 cnt;
u32 wr_p;
u32 rd_p;
u32 qcp_rd_p;
u32 wr_ptr_add;
struct nfp_net_tx_buf *txbufs;
struct nfp_net_tx_desc *txds;
dma_addr_t dma;
size_t size;
bool is_xdp;
} ____cacheline_aligned;
/* RX and freelist descriptor format */
#define PCIE_DESC_RX_DD BIT(7)
/* Flags in the RX descriptor */
#define PCIE_DESC_RX_RSS cpu_to_le16(BIT(15))
#define PCIE_DESC_RX_I_IP4_CSUM cpu_to_le16(BIT(14))
#define PCIE_DESC_RX_I_IP4_CSUM_OK cpu_to_le16(BIT(13))
#define PCIE_DESC_RX_I_TCP_CSUM cpu_to_le16(BIT(12))
#define PCIE_DESC_RX_I_TCP_CSUM_OK cpu_to_le16(BIT(11))
#define PCIE_DESC_RX_I_UDP_CSUM cpu_to_le16(BIT(10))
#define PCIE_DESC_RX_I_UDP_CSUM_OK cpu_to_le16(BIT(9))
#define PCIE_DESC_RX_DECRYPTED cpu_to_le16(BIT(8))
#define PCIE_DESC_RX_EOP cpu_to_le16(BIT(7))
#define PCIE_DESC_RX_IP4_CSUM cpu_to_le16(BIT(6))
#define PCIE_DESC_RX_IP4_CSUM_OK cpu_to_le16(BIT(5))
#define PCIE_DESC_RX_TCP_CSUM cpu_to_le16(BIT(4))
#define PCIE_DESC_RX_TCP_CSUM_OK cpu_to_le16(BIT(3))
#define PCIE_DESC_RX_UDP_CSUM cpu_to_le16(BIT(2))
#define PCIE_DESC_RX_UDP_CSUM_OK cpu_to_le16(BIT(1))
#define PCIE_DESC_RX_VLAN cpu_to_le16(BIT(0))
struct nfp_net_rx_desc {
union {
struct {
u8 dma_addr_hi; /* High bits of the buf address */
__le16 reserved; /* Must be zero */
u8 meta_len_dd; /* Must be zero */
__le32 dma_addr_lo; /* Low bits of the buffer address */
} __packed fld;
struct {
__le16 data_len; /* Length of the frame + meta data */
u8 reserved;
u8 meta_len_dd; /* Length of meta data prepended +
* descriptor done flag.
__le16 flags; /* RX flags. See @PCIE_DESC_RX_* */
__le16 vlan; /* VLAN if stripped */
} __packed rxd;
__le32 vals[2];
struct nfp_meta_parsed {
u8 hash_type;
u8 csum_type;
u32 hash;
u32 mark;
u32 portid;
__wsum csum;
struct nfp_net_rx_hash {
__be32 hash_type;
__be32 hash;
* struct nfp_net_rx_buf - software RX buffer descriptor
* @frag: page fragment buffer
* @dma_addr: DMA mapping address of the buffer
struct nfp_net_rx_buf {
void *frag;
dma_addr_t dma_addr;
* struct nfp_net_rx_ring - RX ring structure
* @r_vec: Back pointer to ring vector structure
* @cnt: Size of the queue in number of descriptors
* @wr_p: FL/RX ring write pointer (free running)
* @rd_p: FL/RX ring read pointer (free running)
* @idx: Ring index from Linux's perspective
* @fl_qcidx: Queue Controller Peripheral (QCP) queue index for the freelist
* @qcp_fl: Pointer to base of the QCP freelist queue
* @rxbufs: Array of transmitted FL/RX buffers
* @rxds: Virtual address of FL/RX ring in host memory
* @xdp_rxq: RX-ring info avail for XDP
* @dma: DMA address of the FL/RX ring
* @size: Size, in bytes, of the FL/RX ring (needed to free)
struct nfp_net_rx_ring {
struct nfp_net_r_vector *r_vec;
u32 cnt;
u32 wr_p;
u32 rd_p;
u32 idx;
int fl_qcidx;
u8 __iomem *qcp_fl;
struct nfp_net_rx_buf *rxbufs;
struct nfp_net_rx_desc *rxds;
struct xdp_rxq_info xdp_rxq;
dma_addr_t dma;
size_t size;
} ____cacheline_aligned;
* struct nfp_net_r_vector - Per ring interrupt vector configuration
* @nfp_net: Backpointer to nfp_net structure
* @napi: NAPI structure for this ring vec
* @tasklet: ctrl vNIC, tasklet for servicing the r_vec
* @queue: ctrl vNIC, send queue
* @lock: ctrl vNIC, r_vec lock protects @queue
* @tx_ring: Pointer to TX ring
* @rx_ring: Pointer to RX ring
* @xdp_ring: Pointer to an extra TX ring for XDP
* @irq_entry: MSI-X table entry (use for talking to the device)
* @event_ctr: Number of interrupt
* @rx_dim: Dynamic interrupt moderation structure for RX
* @tx_dim: Dynamic interrupt moderation structure for TX
* @rx_sync: Seqlock for atomic updates of RX stats
* @rx_pkts: Number of received packets
* @rx_bytes: Number of received bytes
* @rx_drops: Number of packets dropped on RX due to lack of resources
* @hw_csum_rx_ok: Counter of packets where the HW checksum was OK
* @hw_csum_rx_inner_ok: Counter of packets where the inner HW checksum was OK
* @hw_csum_rx_complete: Counter of packets with CHECKSUM_COMPLETE reported
* @hw_csum_rx_error: Counter of packets with bad checksums
* @hw_tls_rx: Number of packets with TLS decrypted by hardware
* @tx_sync: Seqlock for atomic updates of TX stats
* @tx_pkts: Number of Transmitted packets
* @tx_bytes: Number of Transmitted bytes
* @hw_csum_tx: Counter of packets with TX checksum offload requested
* @hw_csum_tx_inner: Counter of inner TX checksum offload requests
* @tx_gather: Counter of packets with Gather DMA
* @tx_lso: Counter of LSO packets sent
* @hw_tls_tx: Counter of TLS packets sent with crypto offloaded to HW
* @tls_tx_fallback: Counter of TLS packets sent which had to be encrypted
* by the fallback path because packets came out of order
* @tls_tx_no_fallback: Counter of TLS packets not sent because the fallback
* path could not encrypt them
* @tx_errors: How many TX errors were encountered
* @tx_busy: How often was TX busy (no space)?
* @rx_replace_buf_alloc_fail: Counter of RX buffer allocation failures
* @irq_vector: Interrupt vector number (use for talking to the OS)
* @handler: Interrupt handler for this ring vector
* @name: Name of the interrupt vector
* @affinity_mask: SMP affinity mask for this vector
* This structure ties RX and TX rings to interrupt vectors and a NAPI
* context. This currently only supports one RX and TX ring per
* interrupt vector but might be extended in the future to allow
* association of multiple rings per vector.
struct nfp_net_r_vector {
struct nfp_net *nfp_net;
union {
struct napi_struct napi;
struct {
struct tasklet_struct tasklet;
struct sk_buff_head queue;
spinlock_t lock;
struct nfp_net_tx_ring *tx_ring;
struct nfp_net_rx_ring *rx_ring;
u16 irq_entry;
u16 event_ctr;
struct dim rx_dim;
struct dim tx_dim;
struct u64_stats_sync rx_sync;
u64 rx_pkts;
u64 rx_bytes;
u64 rx_drops;
u64 hw_csum_rx_ok;
u64 hw_csum_rx_inner_ok;
u64 hw_csum_rx_complete;
u64 hw_tls_rx;
u64 hw_csum_rx_error;
u64 rx_replace_buf_alloc_fail;
struct nfp_net_tx_ring *xdp_ring;
struct u64_stats_sync tx_sync;
u64 tx_pkts;
u64 tx_bytes;
u64 ____cacheline_aligned_in_smp hw_csum_tx;
u64 hw_csum_tx_inner;
u64 tx_gather;
u64 tx_lso;
u64 hw_tls_tx;
u64 tls_tx_fallback;
u64 tls_tx_no_fallback;
u64 tx_errors;
u64 tx_busy;
/* Cold data follows */
u32 irq_vector;
irq_handler_t handler;
char name[IFNAMSIZ + 8];
cpumask_t affinity_mask;
} ____cacheline_aligned;
/* Firmware version as it is written in the 32bit value in the BAR */
struct nfp_net_fw_version {
u8 minor;
u8 major;
u8 class;
u8 resv;
} __packed;
static inline bool nfp_net_fw_ver_eq(struct nfp_net_fw_version *fw_ver,
u8 resv, u8 class, u8 major, u8 minor)
return fw_ver->resv == resv &&
fw_ver->class == class &&
fw_ver->major == major &&
fw_ver->minor == minor;
struct nfp_stat_pair {
u64 pkts;
u64 bytes;
* struct nfp_net_dp - NFP network device datapath data structure
* @dev: Backpointer to struct device
* @netdev: Backpointer to net_device structure
* @is_vf: Is the driver attached to a VF?
* @chained_metadata_format: Firemware will use new metadata format
* @ktls_tx: Is kTLS TX enabled?
* @rx_dma_dir: Mapping direction for RX buffers
* @rx_dma_off: Offset at which DMA packets (for XDP headroom)
* @rx_offset: Offset in the RX buffers where packet data starts
* @ctrl: Local copy of the control register/word.
* @fl_bufsz: Currently configured size of the freelist buffers
* @xdp_prog: Installed XDP program
* @tx_rings: Array of pre-allocated TX ring structures
* @rx_rings: Array of pre-allocated RX ring structures
* @ctrl_bar: Pointer to mapped control BAR
* @txd_cnt: Size of the TX ring in number of descriptors
* @rxd_cnt: Size of the RX ring in number of descriptors
* @num_r_vecs: Number of used ring vectors
* @num_tx_rings: Currently configured number of TX rings
* @num_stack_tx_rings: Number of TX rings used by the stack (not XDP)
* @num_rx_rings: Currently configured number of RX rings
* @mtu: Device MTU
struct nfp_net_dp {
struct device *dev;
struct net_device *netdev;
u8 is_vf:1;
u8 chained_metadata_format:1;
u8 ktls_tx:1;
u8 rx_dma_dir;
u8 rx_offset;
u32 rx_dma_off;
u32 ctrl;
u32 fl_bufsz;
struct bpf_prog *xdp_prog;
struct nfp_net_tx_ring *tx_rings;
struct nfp_net_rx_ring *rx_rings;
u8 __iomem *ctrl_bar;
/* Cold data follows */
unsigned int txd_cnt;
unsigned int rxd_cnt;
unsigned int num_r_vecs;
unsigned int num_tx_rings;
unsigned int num_stack_tx_rings;
unsigned int num_rx_rings;
unsigned int mtu;
* struct nfp_net - NFP network device structure
* @dp: Datapath structure
* @id: vNIC id within the PF (0 for VFs)
* @fw_ver: Firmware version
* @cap: Capabilities advertised by the Firmware
* @max_mtu: Maximum support MTU advertised by the Firmware
* @rss_hfunc: RSS selected hash function
* @rss_cfg: RSS configuration
* @rss_key: RSS secret key
* @rss_itbl: RSS indirection table
* @xdp: Information about the driver XDP program
* @xdp_hw: Information about the HW XDP program
* @max_r_vecs: Number of allocated interrupt vectors for RX/TX
* @max_tx_rings: Maximum number of TX rings supported by the Firmware
* @max_rx_rings: Maximum number of RX rings supported by the Firmware
* @stride_rx: Queue controller RX queue spacing
* @stride_tx: Queue controller TX queue spacing
* @r_vecs: Pre-allocated array of ring vectors
* @irq_entries: Pre-allocated array of MSI-X entries
* @lsc_handler: Handler for Link State Change interrupt
* @lsc_name: Name for Link State Change interrupt
* @exn_handler: Handler for Exception interrupt
* @exn_name: Name for Exception interrupt
* @shared_handler: Handler for shared interrupts
* @shared_name: Name for shared interrupt
* @reconfig_lock: Protects @reconfig_posted, @reconfig_timer_active,
* @reconfig_sync_present and HW reconfiguration request
* regs/machinery from async requests (sync must take
* @bar_lock)
* @reconfig_posted: Pending reconfig bits coming from async sources
* @reconfig_timer_active: Timer for reading reconfiguration results is pending
* @reconfig_sync_present: Some thread is performing synchronous reconfig
* @reconfig_timer: Timer for async reading of reconfig results
* @reconfig_in_progress_update: Update FW is processing now (debug only)
* @bar_lock: vNIC config BAR access lock, protects: update,
* mailbox area, crypto TLV
* @link_up: Is the link up?
* @link_status_lock: Protects @link_* and ensures atomicity with BAR reading
* @rx_coalesce_adapt_on: Is RX interrupt moderation adaptive?
* @tx_coalesce_adapt_on: Is TX interrupt moderation adaptive?
* @rx_coalesce_usecs: RX interrupt moderation usecs delay parameter
* @rx_coalesce_max_frames: RX interrupt moderation frame count parameter
* @tx_coalesce_usecs: TX interrupt moderation usecs delay parameter
* @tx_coalesce_max_frames: TX interrupt moderation frame count parameter
* @qcp_cfg: Pointer to QCP queue used for configuration notification
* @tx_bar: Pointer to mapped TX queues
* @rx_bar: Pointer to mapped FL/RX queues
* @tlv_caps: Parsed TLV capabilities
* @ktls_tx_conn_cnt: Number of offloaded kTLS TX connections
* @ktls_rx_conn_cnt: Number of offloaded kTLS RX connections
* @ktls_conn_id_gen: Trivial generator for kTLS connection ids (for TX)
* @ktls_no_space: Counter of firmware rejecting kTLS connection due to
* lack of space
* @ktls_rx_resync_req: Counter of TLS RX resync requested
* @ktls_rx_resync_ign: Counter of TLS RX resync requests ignored
* @ktls_rx_resync_sent: Counter of TLS RX resync completed
* @mbox_cmsg: Common Control Message via vNIC mailbox state
* @mbox_cmsg.queue: CCM mbox queue of pending messages
* @mbox_cmsg.wq: CCM mbox wait queue of waiting processes
* @mbox_cmsg.workq: CCM mbox work queue for @wait_work and @runq_work
* @mbox_cmsg.wait_work: CCM mbox posted msg reconfig wait work
* @mbox_cmsg.runq_work: CCM mbox posted msg queue runner work
* @mbox_cmsg.tag: CCM mbox message tag allocator
* @debugfs_dir: Device directory in debugfs
* @vnic_list: Entry on device vNIC list
* @pdev: Backpointer to PCI device
* @app: APP handle if available
* @vnic_no_name: For non-port PF vNIC make ndo_get_phys_port_name return
* -EOPNOTSUPP to keep backwards compatibility (set by app)
* @port: Pointer to nfp_port structure if vNIC is a port
* @app_priv: APP private data for this vNIC
struct nfp_net {
struct nfp_net_dp dp;
struct nfp_net_fw_version fw_ver;
u32 id;
u32 cap;
u32 max_mtu;
u8 rss_hfunc;
u32 rss_cfg;
u8 rss_key[NFP_NET_CFG_RSS_KEY_SZ];
u8 rss_itbl[NFP_NET_CFG_RSS_ITBL_SZ];
struct xdp_attachment_info xdp;
struct xdp_attachment_info xdp_hw;
unsigned int max_tx_rings;
unsigned int max_rx_rings;
int stride_tx;
int stride_rx;
unsigned int max_r_vecs;
struct nfp_net_r_vector r_vecs[NFP_NET_MAX_R_VECS];
struct msix_entry irq_entries[NFP_NET_MAX_IRQS];
irq_handler_t lsc_handler;
char lsc_name[IFNAMSIZ + 8];
irq_handler_t exn_handler;
char exn_name[IFNAMSIZ + 8];
irq_handler_t shared_handler;
char shared_name[IFNAMSIZ + 8];
bool link_up;
spinlock_t link_status_lock;
spinlock_t reconfig_lock;
u32 reconfig_posted;
bool reconfig_timer_active;
bool reconfig_sync_present;
struct timer_list reconfig_timer;
u32 reconfig_in_progress_update;
struct semaphore bar_lock;
bool rx_coalesce_adapt_on;
bool tx_coalesce_adapt_on;
u32 rx_coalesce_usecs;
u32 rx_coalesce_max_frames;
u32 tx_coalesce_usecs;
u32 tx_coalesce_max_frames;
u8 __iomem *qcp_cfg;
u8 __iomem *tx_bar;
u8 __iomem *rx_bar;
struct nfp_net_tlv_caps tlv_caps;
unsigned int ktls_tx_conn_cnt;
unsigned int ktls_rx_conn_cnt;
atomic64_t ktls_conn_id_gen;
atomic_t ktls_no_space;
atomic_t ktls_rx_resync_req;
atomic_t ktls_rx_resync_ign;
atomic_t ktls_rx_resync_sent;
struct {
struct sk_buff_head queue;
wait_queue_head_t wq;
struct workqueue_struct *workq;
struct work_struct wait_work;
struct work_struct runq_work;
u16 tag;
} mbox_cmsg;
struct dentry *debugfs_dir;
struct list_head vnic_list;
struct pci_dev *pdev;
struct nfp_app *app;
bool vnic_no_name;
struct nfp_port *port;
void *app_priv;
/* Functions to read/write from/to a BAR
* Performs any endian conversion necessary.
static inline u16 nn_readb(struct nfp_net *nn, int off)
return readb(nn->dp.ctrl_bar + off);
static inline void nn_writeb(struct nfp_net *nn, int off, u8 val)
writeb(val, nn->dp.ctrl_bar + off);
static inline u16 nn_readw(struct nfp_net *nn, int off)
return readw(nn->dp.ctrl_bar + off);
static inline void nn_writew(struct nfp_net *nn, int off, u16 val)
writew(val, nn->dp.ctrl_bar + off);
static inline u32 nn_readl(struct nfp_net *nn, int off)
return readl(nn->dp.ctrl_bar + off);
static inline void nn_writel(struct nfp_net *nn, int off, u32 val)
writel(val, nn->dp.ctrl_bar + off);
static inline u64 nn_readq(struct nfp_net *nn, int off)
return readq(nn->dp.ctrl_bar + off);
static inline void nn_writeq(struct nfp_net *nn, int off, u64 val)
writeq(val, nn->dp.ctrl_bar + off);
/* Flush posted PCI writes by reading something without side effects */
static inline void nn_pci_flush(struct nfp_net *nn)
nn_readl(nn, NFP_NET_CFG_VERSION);
/* Queue Controller Peripheral access functions and definitions.
* Some of the BARs of the NFP are mapped to portions of the Queue
* Controller Peripheral (QCP) address space on the NFP. A QCP queue
* has a read and a write pointer (as well as a size and flags,
* indicating overflow etc). The QCP offers a number of different
* operation on queue pointers, but here we only offer function to
* either add to a pointer or to read the pointer value.
#define NFP_QCP_QUEUE_ADDR_SZ 0x800
#define NFP_QCP_QUEUE_AREA_SZ 0x80000
#define NFP_QCP_QUEUE_ADD_RPTR 0x0000
#define NFP_QCP_QUEUE_ADD_WPTR 0x0004
#define NFP_QCP_QUEUE_STS_LO 0x0008
#define NFP_QCP_QUEUE_STS_LO_READPTR_mask 0x3ffff
#define NFP_QCP_QUEUE_STS_HI 0x000c
#define NFP_QCP_QUEUE_STS_HI_WRITEPTR_mask 0x3ffff
/* The offset of a QCP queues in the PCIe Target */
#define NFP_PCIE_QUEUE(_q) (0x80000 + (NFP_QCP_QUEUE_ADDR_SZ * ((_q) & 0xff)))
/* nfp_qcp_ptr - Read or Write Pointer of a queue */
enum nfp_qcp_ptr {
/* There appear to be an *undocumented* upper limit on the value which
* one can add to a queue and that value is either 0x3f or 0x7f. We
* go with 0x3f as a conservative measure.
#define NFP_QCP_MAX_ADD 0x3f
static inline void _nfp_qcp_ptr_add(u8 __iomem *q,
enum nfp_qcp_ptr ptr, u32 val)
u32 off;
if (ptr == NFP_QCP_READ_PTR)
while (val > NFP_QCP_MAX_ADD) {
writel(NFP_QCP_MAX_ADD, q + off);
writel(val, q + off);
* nfp_qcp_rd_ptr_add() - Add the value to the read pointer of a queue
* @q: Base address for queue structure
* @val: Value to add to the queue pointer
* If @val is greater than @NFP_QCP_MAX_ADD multiple writes are performed.
static inline void nfp_qcp_rd_ptr_add(u8 __iomem *q, u32 val)
_nfp_qcp_ptr_add(q, NFP_QCP_READ_PTR, val);
* nfp_qcp_wr_ptr_add() - Add the value to the write pointer of a queue
* @q: Base address for queue structure
* @val: Value to add to the queue pointer
* If @val is greater than @NFP_QCP_MAX_ADD multiple writes are performed.
static inline void nfp_qcp_wr_ptr_add(u8 __iomem *q, u32 val)
_nfp_qcp_ptr_add(q, NFP_QCP_WRITE_PTR, val);
static inline u32 _nfp_qcp_read(u8 __iomem *q, enum nfp_qcp_ptr ptr)
u32 off;
u32 val;
if (ptr == NFP_QCP_READ_PTR)
val = readl(q + off);
if (ptr == NFP_QCP_READ_PTR)
return val & NFP_QCP_QUEUE_STS_LO_READPTR_mask;
return val & NFP_QCP_QUEUE_STS_HI_WRITEPTR_mask;
* nfp_qcp_rd_ptr_read() - Read the current read pointer value for a queue
* @q: Base address for queue structure
* Return: Value read.
static inline u32 nfp_qcp_rd_ptr_read(u8 __iomem *q)
return _nfp_qcp_read(q, NFP_QCP_READ_PTR);
* nfp_qcp_wr_ptr_read() - Read the current write pointer value for a queue
* @q: Base address for queue structure
* Return: Value read.
static inline u32 nfp_qcp_wr_ptr_read(u8 __iomem *q)
return _nfp_qcp_read(q, NFP_QCP_WRITE_PTR);
static inline bool nfp_net_is_data_vnic(struct nfp_net *nn)
WARN_ON_ONCE(!nn->dp.netdev && nn->port);
return !!nn->dp.netdev;
static inline bool nfp_net_running(struct nfp_net *nn)
return nn->dp.ctrl & NFP_NET_CFG_CTRL_ENABLE;
static inline const char *nfp_net_name(struct nfp_net *nn)
return nn->dp.netdev ? nn->dp.netdev->name : "ctrl";
static inline void nfp_ctrl_lock(struct nfp_net *nn)
static inline void nfp_ctrl_unlock(struct nfp_net *nn)
static inline void nn_ctrl_bar_lock(struct nfp_net *nn)
static inline bool nn_ctrl_bar_trylock(struct nfp_net *nn)
return !down_trylock(&nn->bar_lock);
static inline void nn_ctrl_bar_unlock(struct nfp_net *nn)
/* Globals */
extern const char nfp_driver_version[];
extern const struct net_device_ops nfp_net_netdev_ops;
static inline bool nfp_netdev_is_nfp_net(struct net_device *netdev)
return netdev->netdev_ops == &nfp_net_netdev_ops;
static inline int nfp_net_coalesce_para_check(u32 usecs, u32 pkts)
if ((usecs >= ((1 << 16) - 1)) || (pkts >= ((1 << 16) - 1)))
return -EINVAL;
return 0;
/* Prototypes */
void nfp_net_get_fw_version(struct nfp_net_fw_version *fw_ver,
void __iomem *ctrl_bar);
struct nfp_net *
nfp_net_alloc(struct pci_dev *pdev, void __iomem *ctrl_bar, bool needs_netdev,
unsigned int max_tx_rings, unsigned int max_rx_rings);
void nfp_net_free(struct nfp_net *nn);
int nfp_net_init(struct nfp_net *nn);
void nfp_net_clean(struct nfp_net *nn);
int nfp_ctrl_open(struct nfp_net *nn);
void nfp_ctrl_close(struct nfp_net *nn);
void nfp_net_set_ethtool_ops(struct net_device *netdev);
void nfp_net_info(struct nfp_net *nn);
int __nfp_net_reconfig(struct nfp_net *nn, u32 update);
int nfp_net_reconfig(struct nfp_net *nn, u32 update);
unsigned int nfp_net_rss_key_sz(struct nfp_net *nn);
void nfp_net_rss_write_itbl(struct nfp_net *nn);
void nfp_net_rss_write_key(struct nfp_net *nn);
void nfp_net_coalesce_write_cfg(struct nfp_net *nn);
int nfp_net_mbox_lock(struct nfp_net *nn, unsigned int data_size);
int nfp_net_mbox_reconfig(struct nfp_net *nn, u32 mbox_cmd);
int nfp_net_mbox_reconfig_and_unlock(struct nfp_net *nn, u32 mbox_cmd);
void nfp_net_mbox_reconfig_post(struct nfp_net *nn, u32 update);
int nfp_net_mbox_reconfig_wait_posted(struct nfp_net *nn);
unsigned int
nfp_net_irqs_alloc(struct pci_dev *pdev, struct msix_entry *irq_entries,
unsigned int min_irqs, unsigned int want_irqs);
void nfp_net_irqs_disable(struct pci_dev *pdev);
nfp_net_irqs_assign(struct nfp_net *nn, struct msix_entry *irq_entries,
unsigned int n);
struct nfp_net_dp *nfp_net_clone_dp(struct nfp_net *nn);
int nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *new,
struct netlink_ext_ack *extack);
void nfp_net_debugfs_create(void);
void nfp_net_debugfs_destroy(void);
struct dentry *nfp_net_debugfs_device_add(struct pci_dev *pdev);
void nfp_net_debugfs_vnic_add(struct nfp_net *nn, struct dentry *ddir);
void nfp_net_debugfs_dir_clean(struct dentry **dir);
static inline void nfp_net_debugfs_create(void)
static inline void nfp_net_debugfs_destroy(void)
static inline struct dentry *nfp_net_debugfs_device_add(struct pci_dev *pdev)
return NULL;
static inline void
nfp_net_debugfs_vnic_add(struct nfp_net *nn, struct dentry *ddir)
static inline void nfp_net_debugfs_dir_clean(struct dentry **dir)
#endif /* CONFIG_NFP_DEBUG */
#endif /* _NFP_NET_H_ */