/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (C) 2023 Intel Corporation */
#ifndef _IDPF_TXRX_H_
#define _IDPF_TXRX_H_
#include <linux/dim.h>
#include <net/libeth/cache.h>
#include <net/tcp.h>
#include <net/netdev_queues.h>
#include "idpf_lan_txrx.h"
#include "virtchnl2_lan_desc.h"
#define IDPF_LARGE_MAX_Q 256
#define IDPF_MAX_Q 16
#define IDPF_MIN_Q 2
/* Mailbox Queue */
#define IDPF_MAX_MBXQ 1
#define IDPF_MIN_TXQ_DESC 64
#define IDPF_MIN_RXQ_DESC 64
#define IDPF_MIN_TXQ_COMPLQ_DESC 256
#define IDPF_MAX_QIDS 256
/* Number of descriptors in a queue should be a multiple of 32. RX queue
* descriptors alone should be a multiple of IDPF_REQ_RXQ_DESC_MULTIPLE
* to achieve BufQ descriptors aligned to 32
*/
#define IDPF_REQ_DESC_MULTIPLE 32
#define IDPF_REQ_RXQ_DESC_MULTIPLE (IDPF_MAX_BUFQS_PER_RXQ_GRP * 32 )
#define IDPF_MIN_TX_DESC_NEEDED (MAX_SKB_FRAGS + 6 )
#define IDPF_TX_WAKE_THRESH ((u16)IDPF_MIN_TX_DESC_NEEDED * 2 )
#define IDPF_MAX_DESCS 8160
#define IDPF_MAX_TXQ_DESC ALIGN_DOWN(IDPF_MAX_DESCS, IDPF_REQ_DESC_MULTIPLE)
#define IDPF_MAX_RXQ_DESC ALIGN_DOWN(IDPF_MAX_DESCS, IDPF_REQ_RXQ_DESC_MULTIPLE)
#define MIN_SUPPORT_TXDID (\
VIRTCHNL2_TXDID_FLEX_FLOW_SCHED |\
VIRTCHNL2_TXDID_FLEX_TSO_CTX)
#define IDPF_DFLT_SINGLEQ_TX_Q_GROUPS 1
#define IDPF_DFLT_SINGLEQ_RX_Q_GROUPS 1
#define IDPF_DFLT_SINGLEQ_TXQ_PER_GROUP 4
#define IDPF_DFLT_SINGLEQ_RXQ_PER_GROUP 4
#define IDPF_COMPLQ_PER_GROUP 1
#define IDPF_SINGLE_BUFQ_PER_RXQ_GRP 1
#define IDPF_MAX_BUFQS_PER_RXQ_GRP 2
#define IDPF_BUFQ2_ENA 1
#define IDPF_NUMQ_PER_CHUNK 1
#define IDPF_DFLT_SPLITQ_TXQ_PER_GROUP 1
#define IDPF_DFLT_SPLITQ_RXQ_PER_GROUP 1
/* Default vector sharing */
#define IDPF_MBX_Q_VEC 1
#define IDPF_MIN_Q_VEC 1
#define IDPF_MIN_RDMA_VEC 2
#define IDPF_DFLT_TX_Q_DESC_COUNT 512
#define IDPF_DFLT_TX_COMPLQ_DESC_COUNT 512
#define IDPF_DFLT_RX_Q_DESC_COUNT 512
/* IMPORTANT: We absolutely _cannot_ have more buffers in the system than a
* given RX completion queue has descriptors . This includes _ ALL_ buffer
* queues . E . g . : If you have two buffer queues of 512 descriptors and buffers ,
* you have a total of 1024 buffers so your RX queue _ must_ have at least that
* many descriptors . This macro divides a given number of RX descriptors by
* number of buffer queues to calculate how many descriptors each buffer queue
* can have without overrunning the RX queue .
*
* If you give hardware more buffers than completion descriptors what will
* happen is that if hardware gets a chance to post more than ring wrap of
* descriptors before SW gets an interrupt and overwrites SW head , the gen bit
* in the descriptor will be wrong . Any overwritten descriptors ' buffers will
* be gone forever and SW has no reasonable way to tell that this has happened .
* From SW perspective , when we finally get an interrupt , it looks like we ' re
* still waiting for descriptor to be done , stalling forever .
*/
#define IDPF_RX_BUFQ_DESC_COUNT(RXD, NUM_BUFQ) ((RXD) / (NUM_BUFQ))
#define IDPF_RX_BUFQ_WORKING_SET(rxq) ((rxq)->desc_count - 1 )
#define IDPF_RX_BUMP_NTC(rxq, ntc) \
do { \
if (unlikely(++(ntc) == (rxq)->desc_count)) { \
ntc = 0 ; \
idpf_queue_change(GEN_CHK, rxq); \
} \
} while (0 )
#define IDPF_SINGLEQ_BUMP_RING_IDX(q, idx) \
do { \
if (unlikely(++(idx) == (q)->desc_count)) \
idx = 0 ; \
} while (0 )
#define IDPF_RX_BUF_STRIDE 32
#define IDPF_RX_BUF_POST_STRIDE 16
#define IDPF_LOW_WATERMARK 64
#define IDPF_TX_TSO_MIN_MSS 88
/* Minimum number of descriptors between 2 descriptors with the RE bit set;
* only relevant in flow scheduling mode
*/
#define IDPF_TX_SPLITQ_RE_MIN_GAP 64
#define IDPF_RFL_BI_GEN_M BIT(16 )
#define IDPF_RFL_BI_BUFID_M GENMASK(15 , 0 )
#define IDPF_RXD_EOF_SPLITQ VIRTCHNL2_RX_FLEX_DESC_ADV_STATUS0_EOF_M
#define IDPF_RXD_EOF_SINGLEQ VIRTCHNL2_RX_BASE_DESC_STATUS_EOF_M
#define IDPF_DESC_UNUSED(txq) \
((((txq)->next_to_clean > (txq)->next_to_use) ? 0 : (txq)->desc_count) + \
(txq)->next_to_clean - (txq)->next_to_use - 1 )
#define IDPF_TX_COMPLQ_OVERFLOW_THRESH(txcq) ((txcq)->desc_count >> 1 )
/* Determine the absolute number of completions pending, i.e. the number of
* completions that are expected to arrive on the TX completion queue .
*/
#define IDPF_TX_COMPLQ_PENDING(txq) \
(((txq)->num_completions_pending >= (txq)->complq->num_completions ? \
0 : U32_MAX) + \
(txq)->num_completions_pending - (txq)->complq->num_completions)
#define IDPF_TXBUF_NULL U32_MAX
#define IDPF_TXD_LAST_DESC_CMD (IDPF_TX_DESC_CMD_EOP | IDPF_TX_DESC_CMD_RS)
#define IDPF_TX_FLAGS_TSO BIT(0 )
#define IDPF_TX_FLAGS_IPV4 BIT(1 )
#define IDPF_TX_FLAGS_IPV6 BIT(2 )
#define IDPF_TX_FLAGS_TUNNEL BIT(3 )
#define IDPF_TX_FLAGS_TSYN BIT(4 )
union idpf_tx_flex_desc {
struct idpf_flex_tx_desc q; /* queue based scheduling */
struct idpf_flex_tx_sched_desc flow; /* flow based scheduling */
};
#define idpf_tx_buf libeth_sqe
/**
* struct idpf_tx_offload_params - Offload parameters for a given packet
* @ tx_flags : Feature flags enabled for this packet
* @ hdr_offsets : Offset parameter for single queue model
* @ cd_tunneling : Type of tunneling enabled for single queue model
* @ tso_len : Total length of payload to segment
* @ mss : Segment size
* @ tso_segs : Number of segments to be sent
* @ tso_hdr_len : Length of headers to be duplicated
* @ td_cmd : Command field to be inserted into descriptor
*/
struct idpf_tx_offload_params {
u32 tx_flags;
u32 hdr_offsets;
u32 cd_tunneling;
u32 tso_len;
u16 mss;
u16 tso_segs;
u16 tso_hdr_len;
u16 td_cmd;
};
/**
* struct idpf_tx_splitq_params
* @ dtype : General descriptor info
* @ eop_cmd : Type of EOP
* @ compl_tag : Associated tag for completion
* @ td_tag : Descriptor tunneling tag
* @ offload : Offload parameters
* @ prev_ntu : stored TxQ next_to_use in case of rollback
* @ prev_refill_ntc : stored refillq next_to_clean in case of packet rollback
* @ prev_refill_gen : stored refillq generation bit in case of packet rollback
*/
struct idpf_tx_splitq_params {
enum idpf_tx_desc_dtype_value dtype;
u16 eop_cmd;
union {
u16 compl_tag;
u16 td_tag;
};
struct idpf_tx_offload_params offload;
u16 prev_ntu;
u16 prev_refill_ntc;
bool prev_refill_gen;
};
enum idpf_tx_ctx_desc_eipt_offload {
IDPF_TX_CTX_EXT_IP_NONE = 0 x0,
IDPF_TX_CTX_EXT_IP_IPV6 = 0 x1,
IDPF_TX_CTX_EXT_IP_IPV4_NO_CSUM = 0 x2,
IDPF_TX_CTX_EXT_IP_IPV4 = 0 x3
};
#define IDPF_TX_COMPLQ_CLEAN_BUDGET 256
#define IDPF_TX_MIN_PKT_LEN 17
#define IDPF_TX_DESCS_FOR_SKB_DATA_PTR 1
#define IDPF_TX_DESCS_PER_CACHE_LINE (L1_CACHE_BYTES / \
sizeof (struct idpf_flex_tx_desc))
#define IDPF_TX_DESCS_FOR_CTX 1
/* TX descriptors needed, worst case */
#define IDPF_TX_DESC_NEEDED (MAX_SKB_FRAGS + IDPF_TX_DESCS_FOR_CTX + \
IDPF_TX_DESCS_PER_CACHE_LINE + \
IDPF_TX_DESCS_FOR_SKB_DATA_PTR)
/* The size limit for a transmit buffer in a descriptor is (16K - 1).
* In order to align with the read requests we will align the value to
* the nearest 4 K which represents our maximum read request size .
*/
#define IDPF_TX_MAX_READ_REQ_SIZE SZ_4K
#define IDPF_TX_MAX_DESC_DATA (SZ_16K - 1 )
#define IDPF_TX_MAX_DESC_DATA_ALIGNED \
ALIGN_DOWN(IDPF_TX_MAX_DESC_DATA, IDPF_TX_MAX_READ_REQ_SIZE)
#define idpf_rx_buf libeth_fqe
#define IDPF_RX_MAX_PTYPE_PROTO_IDS 32
#define IDPF_RX_MAX_PTYPE_SZ (sizeof (struct virtchnl2_ptype) + \
(sizeof (u16) * IDPF_RX_MAX_PTYPE_PROTO_IDS))
#define IDPF_RX_PTYPE_HDR_SZ sizeof (struct virtchnl2_get_ptype_info)
#define IDPF_RX_MAX_PTYPES_PER_BUF \
DIV_ROUND_DOWN_ULL((IDPF_CTLQ_MAX_BUF_LEN - IDPF_RX_PTYPE_HDR_SZ), \
IDPF_RX_MAX_PTYPE_SZ)
#define IDPF_GET_PTYPE_SIZE(p) struct_size((p), proto_id, (p)->proto_id_count)
#define IDPF_TUN_IP_GRE (\
IDPF_PTYPE_TUNNEL_IP |\
IDPF_PTYPE_TUNNEL_IP_GRENAT)
#define IDPF_TUN_IP_GRE_MAC (\
IDPF_TUN_IP_GRE |\
IDPF_PTYPE_TUNNEL_IP_GRENAT_MAC)
#define IDPF_RX_MAX_PTYPE 1024
#define IDPF_RX_MAX_BASE_PTYPE 256
#define IDPF_INVALID_PTYPE_ID 0 xFFFF
enum idpf_tunnel_state {
IDPF_PTYPE_TUNNEL_IP = BIT(0 ),
IDPF_PTYPE_TUNNEL_IP_GRENAT = BIT(1 ),
IDPF_PTYPE_TUNNEL_IP_GRENAT_MAC = BIT(2 ),
};
struct idpf_ptype_state {
bool outer_ip:1 ;
bool outer_frag:1 ;
u8 tunnel_state:6 ;
};
/**
* enum idpf_queue_flags_t
* @ _ _ IDPF_Q_GEN_CHK : Queues operating in splitq mode use a generation bit to
* identify new descriptor writebacks on the ring . HW sets
* the gen bit to 1 on the first writeback of any given
* descriptor . After the ring wraps , HW sets the gen bit of
* those descriptors to 0 , and continues flipping
* 0 - > 1 or 1 - > 0 on each ring wrap . SW maintains its own
* gen bit to know what value will indicate writebacks on
* the next pass around the ring . E . g . it is initialized
* to 1 and knows that reading a gen bit of 1 in any
* descriptor on the initial pass of the ring indicates a
* writeback . It also flips on every ring wrap .
* @ _ _ IDPF_Q_RFL_GEN_CHK : Refill queues are SW only , so Q_GEN acts as the HW
* bit and Q_RFL_GEN is the SW bit .
* @ _ _ IDPF_Q_FLOW_SCH_EN : Enable flow scheduling
* @ _ _ IDPF_Q_SW_MARKER : Used to indicate TX queue marker completions
* @ _ _ IDPF_Q_POLL_MODE : Enable poll mode
* @ _ _ IDPF_Q_CRC_EN : enable CRC offload in singleq mode
* @ _ _ IDPF_Q_HSPLIT_EN : enable header split on Rx ( splitq )
* @ _ _ IDPF_Q_PTP : indicates whether the Rx timestamping is enabled for the
* queue
* @ _ _ IDPF_Q_FLAGS_NBITS : Must be last
*/
enum idpf_queue_flags_t {
__IDPF_Q_GEN_CHK,
__IDPF_Q_RFL_GEN_CHK,
__IDPF_Q_FLOW_SCH_EN,
__IDPF_Q_SW_MARKER,
__IDPF_Q_POLL_MODE,
__IDPF_Q_CRC_EN,
__IDPF_Q_HSPLIT_EN,
__IDPF_Q_PTP,
__IDPF_Q_FLAGS_NBITS,
};
#define idpf_queue_set(f, q) __set_bit(__IDPF_Q_## f, (q)->flags)
#define idpf_queue_clear(f, q) __clear_bit(__IDPF_Q_## f, (q)->flags)
#define idpf_queue_change(f, q) __change_bit(__IDPF_Q_## f, (q)->flags)
#define idpf_queue_has(f, q) test_bit(__IDPF_Q_## f, (q)->flags)
#define idpf_queue_has_clear(f, q) \
__test_and_clear_bit(__IDPF_Q_## f, (q)->flags)
#define idpf_queue_assign(f, q, v) \
__assign_bit(__IDPF_Q_## f, (q)->flags, v)
/**
* struct idpf_vec_regs
* @ dyn_ctl_reg : Dynamic control interrupt register offset
* @ itrn_reg : Interrupt Throttling Rate register offset
* @ itrn_index_spacing : Register spacing between ITR registers of the same
* vector
*/
struct idpf_vec_regs {
u32 dyn_ctl_reg;
u32 itrn_reg;
u32 itrn_index_spacing;
};
/**
* struct idpf_intr_reg
* @ dyn_ctl : Dynamic control interrupt register
* @ dyn_ctl_intena_m : Mask for dyn_ctl interrupt enable
* @ dyn_ctl_intena_msk_m : Mask for dyn_ctl interrupt enable mask
* @ dyn_ctl_itridx_s : Register bit offset for ITR index
* @ dyn_ctl_itridx_m : Mask for ITR index
* @ dyn_ctl_intrvl_s : Register bit offset for ITR interval
* @ dyn_ctl_wb_on_itr_m : Mask for WB on ITR feature
* @ dyn_ctl_sw_itridx_ena_m : Mask for SW ITR index
* @ dyn_ctl_swint_trig_m : Mask for dyn_ctl SW triggered interrupt enable
* @ rx_itr : RX ITR register
* @ tx_itr : TX ITR register
* @ icr_ena : Interrupt cause register offset
* @ icr_ena_ctlq_m : Mask for ICR
*/
struct idpf_intr_reg {
void __iomem *dyn_ctl;
u32 dyn_ctl_intena_m;
u32 dyn_ctl_intena_msk_m;
u32 dyn_ctl_itridx_s;
u32 dyn_ctl_itridx_m;
u32 dyn_ctl_intrvl_s;
u32 dyn_ctl_wb_on_itr_m;
u32 dyn_ctl_sw_itridx_ena_m;
u32 dyn_ctl_swint_trig_m;
void __iomem *rx_itr;
void __iomem *tx_itr;
void __iomem *icr_ena;
u32 icr_ena_ctlq_m;
};
/**
* struct idpf_q_vector
* @ vport : Vport back pointer
* @ num_rxq : Number of RX queues
* @ num_txq : Number of TX queues
* @ num_bufq : Number of buffer queues
* @ num_complq : number of completion queues
* @ rx : Array of RX queues to service
* @ tx : Array of TX queues to service
* @ bufq : Array of buffer queues to service
* @ complq : array of completion queues
* @ intr_reg : See struct idpf_intr_reg
* @ napi : napi handler
* @ total_events : Number of interrupts processed
* @ wb_on_itr : whether WB on ITR is enabled
* @ tx_dim : Data for TX net_dim algorithm
* @ tx_itr_value : TX interrupt throttling rate
* @ tx_intr_mode : Dynamic ITR or not
* @ tx_itr_idx : TX ITR index
* @ rx_dim : Data for RX net_dim algorithm
* @ rx_itr_value : RX interrupt throttling rate
* @ rx_intr_mode : Dynamic ITR or not
* @ rx_itr_idx : RX ITR index
* @ v_idx : Vector index
*/
struct idpf_q_vector {
__cacheline_group_begin_aligned(read_mostly);
struct idpf_vport *vport;
u16 num_rxq;
u16 num_txq;
u16 num_bufq;
u16 num_complq;
struct idpf_rx_queue **rx;
struct idpf_tx_queue **tx;
struct idpf_buf_queue **bufq;
struct idpf_compl_queue **complq;
struct idpf_intr_reg intr_reg;
__cacheline_group_end_aligned(read_mostly);
__cacheline_group_begin_aligned(read_write);
struct napi_struct napi;
u16 total_events;
bool wb_on_itr;
struct dim tx_dim;
u16 tx_itr_value;
bool tx_intr_mode;
u32 tx_itr_idx;
struct dim rx_dim;
u16 rx_itr_value;
bool rx_intr_mode;
u32 rx_itr_idx;
__cacheline_group_end_aligned(read_write);
__cacheline_group_begin_aligned(cold);
u16 v_idx;
__cacheline_group_end_aligned(cold);
};
libeth_cacheline_set_assert(struct idpf_q_vector, 120 ,
24 + sizeof (struct napi_struct) +
2 * sizeof (struct dim),
8 );
struct idpf_rx_queue_stats {
u64_stats_t packets;
u64_stats_t bytes;
u64_stats_t rsc_pkts;
u64_stats_t hw_csum_err;
u64_stats_t hsplit_pkts;
u64_stats_t hsplit_buf_ovf;
u64_stats_t bad_descs;
};
struct idpf_tx_queue_stats {
u64_stats_t packets;
u64_stats_t bytes;
u64_stats_t lso_pkts;
u64_stats_t linearize;
u64_stats_t q_busy;
u64_stats_t skb_drops;
u64_stats_t dma_map_errs;
u64_stats_t tstamp_skipped;
};
#define IDPF_ITR_DYNAMIC 1
#define IDPF_ITR_MAX 0 x1FE0
#define IDPF_ITR_20K 0 x0032
#define IDPF_ITR_GRAN_S 1 /* Assume ITR granularity is 2us */
#define IDPF_ITR_MASK 0 x1FFE /* ITR register value alignment mask */
#define ITR_REG_ALIGN(setting) ((setting) & IDPF_ITR_MASK)
#define IDPF_ITR_IS_DYNAMIC(itr_mode) (itr_mode)
#define IDPF_ITR_TX_DEF IDPF_ITR_20K
#define IDPF_ITR_RX_DEF IDPF_ITR_20K
/* Index used for 'SW ITR' update in DYN_CTL register */
#define IDPF_SW_ITR_UPDATE_IDX 2
/* Index used for 'No ITR' update in DYN_CTL register */
#define IDPF_NO_ITR_UPDATE_IDX 3
#define IDPF_ITR_IDX_SPACING(spacing, dflt) (spacing ? spacing : dflt)
#define IDPF_DIM_DEFAULT_PROFILE_IX 1
/**
* struct idpf_rx_queue - software structure representing a receive queue
* @ rx : universal receive descriptor array
* @ single_buf : buffer descriptor array in singleq
* @ desc_ring : virtual descriptor ring address
* @ bufq_sets : Pointer to the array of buffer queues in splitq mode
* @ napi : NAPI instance corresponding to this queue ( splitq )
* @ rx_buf : See struct & libeth_fqe
* @ pp : Page pool pointer in singleq mode
* @ netdev : & net_device corresponding to this queue
* @ tail : Tail offset . Used for both queue models single and split .
* @ flags : See enum idpf_queue_flags_t
* @ idx : For RX queue , it is used to index to total RX queue across groups and
* used for skb reporting .
* @ desc_count : Number of descriptors
* @ rxdids : Supported RX descriptor ids
* @ rx_ptype_lkup : LUT of Rx ptypes
* @ next_to_use : Next descriptor to use
* @ next_to_clean : Next descriptor to clean
* @ next_to_alloc : RX buffer to allocate at
* @ skb : Pointer to the skb
* @ truesize : data buffer truesize in singleq
* @ cached_phc_time : Cached PHC time for the Rx queue
* @ stats_sync : See struct u64_stats_sync
* @ q_stats : See union idpf_rx_queue_stats
* @ q_id : Queue id
* @ size : Length of descriptor ring in bytes
* @ dma : Physical address of ring
* @ q_vector : Backreference to associated vector
* @ rx_buffer_low_watermark : RX buffer low watermark
* @ rx_hbuf_size : Header buffer size
* @ rx_buf_size : Buffer size
* @ rx_max_pkt_size : RX max packet size
*/
struct idpf_rx_queue {
__cacheline_group_begin_aligned(read_mostly);
union {
union virtchnl2_rx_desc *rx;
struct virtchnl2_singleq_rx_buf_desc *single_buf;
void *desc_ring;
};
union {
struct {
struct idpf_bufq_set *bufq_sets;
struct napi_struct *napi;
};
struct {
struct libeth_fqe *rx_buf;
struct page_pool *pp;
};
};
struct net_device *netdev;
void __iomem *tail;
DECLARE_BITMAP(flags, __IDPF_Q_FLAGS_NBITS);
u16 idx;
u16 desc_count;
u32 rxdids;
const struct libeth_rx_pt *rx_ptype_lkup;
__cacheline_group_end_aligned(read_mostly);
__cacheline_group_begin_aligned(read_write);
u16 next_to_use;
u16 next_to_clean;
u16 next_to_alloc;
struct sk_buff *skb;
u32 truesize;
u64 cached_phc_time;
struct u64_stats_sync stats_sync;
struct idpf_rx_queue_stats q_stats;
__cacheline_group_end_aligned(read_write);
__cacheline_group_begin_aligned(cold);
u32 q_id;
u32 size;
dma_addr_t dma;
struct idpf_q_vector *q_vector;
u16 rx_buffer_low_watermark;
u16 rx_hbuf_size;
u16 rx_buf_size;
u16 rx_max_pkt_size;
__cacheline_group_end_aligned(cold);
};
libeth_cacheline_set_assert(struct idpf_rx_queue, 64 ,
88 + sizeof (struct u64_stats_sync),
32 );
/**
* struct idpf_tx_queue - software structure representing a transmit queue
* @ base_tx : base Tx descriptor array
* @ base_ctx : base Tx context descriptor array
* @ flex_tx : flex Tx descriptor array
* @ flex_ctx : flex Tx context descriptor array
* @ desc_ring : virtual descriptor ring address
* @ tx_buf : See struct idpf_tx_buf
* @ txq_grp : See struct idpf_txq_group
* @ dev : Device back pointer for DMA mapping
* @ tail : Tail offset . Used for both queue models single and split
* @ flags : See enum idpf_queue_flags_t
* @ idx : For TX queue , it is used as index to map between TX queue group and
* hot path TX pointers stored in vport . Used in both singleq / splitq .
* @ desc_count : Number of descriptors
* @ tx_min_pkt_len : Min supported packet length
* @ compl_tag_gen_s : Completion tag generation bit
* The format of the completion tag will change based on the TXQ
* descriptor ring size so that we can maintain roughly the same level
* of " uniqueness " across all descriptor sizes . For example , if the
* TXQ descriptor ring size is 64 ( the minimum size supported ) , the
* completion tag will be formatted as below :
* 15 6 5 0
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
* | GEN = 0 - 1023 | IDX = 0 - 63 |
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*
* This gives us 64 * 1024 = 65536 possible unique values . Similarly , if
* the TXQ descriptor ring size is 8160 ( the maximum size supported ) ,
* the completion tag will be formatted as below :
* 15 13 12 0
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
* | GEN | IDX = 0 - 8159 |
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*
* This gives us 8 * 8160 = 65280 possible unique values .
* @ netdev : & net_device corresponding to this queue
* @ next_to_use : Next descriptor to use
* @ next_to_clean : Next descriptor to clean
* @ last_re : last descriptor index that RE bit was set
* @ tx_max_bufs : Max buffers that can be transmitted with scatter - gather
* @ cleaned_bytes : Splitq only , TXQ only : When a TX completion is received on
* the TX completion queue , it can be for any TXQ associated
* with that completion queue . This means we can clean up to
* N TXQs during a single call to clean the completion queue .
* cleaned_bytes | pkts tracks the clean stats per TXQ during
* that single call to clean the completion queue . By doing so ,
* we can update BQL with aggregate cleaned stats for each TXQ
* only once at the end of the cleaning routine .
* @ clean_budget : singleq only , queue cleaning budget
* @ cleaned_pkts : Number of packets cleaned for the above said case
* @ refillq : Pointer to refill queue
* @ cached_tstamp_caps : Tx timestamp capabilities negotiated with the CP
* @ tstamp_task : Work that handles Tx timestamp read
* @ stats_sync : See struct u64_stats_sync
* @ q_stats : See union idpf_tx_queue_stats
* @ q_id : Queue id
* @ size : Length of descriptor ring in bytes
* @ dma : Physical address of ring
* @ q_vector : Backreference to associated vector
* @ buf_pool_size : Total number of idpf_tx_buf
*/
struct idpf_tx_queue {
__cacheline_group_begin_aligned(read_mostly);
union {
struct idpf_base_tx_desc *base_tx;
struct idpf_base_tx_ctx_desc *base_ctx;
union idpf_tx_flex_desc *flex_tx;
union idpf_flex_tx_ctx_desc *flex_ctx;
void *desc_ring;
};
struct libeth_sqe *tx_buf;
struct idpf_txq_group *txq_grp;
struct device *dev;
void __iomem *tail;
DECLARE_BITMAP(flags, __IDPF_Q_FLAGS_NBITS);
u16 idx;
u16 desc_count;
u16 tx_min_pkt_len;
struct net_device *netdev;
__cacheline_group_end_aligned(read_mostly);
__cacheline_group_begin_aligned(read_write);
u16 next_to_use;
u16 next_to_clean;
u16 last_re;
u16 tx_max_bufs;
union {
u32 cleaned_bytes;
u32 clean_budget;
};
u16 cleaned_pkts;
struct idpf_sw_queue *refillq;
struct idpf_ptp_vport_tx_tstamp_caps *cached_tstamp_caps;
struct work_struct *tstamp_task;
struct u64_stats_sync stats_sync;
struct idpf_tx_queue_stats q_stats;
__cacheline_group_end_aligned(read_write);
__cacheline_group_begin_aligned(cold);
u32 q_id;
u32 size;
dma_addr_t dma;
struct idpf_q_vector *q_vector;
u32 buf_pool_size;
__cacheline_group_end_aligned(cold);
};
libeth_cacheline_set_assert(struct idpf_tx_queue, 64 ,
104 + sizeof (struct u64_stats_sync),
32 );
/**
* struct idpf_buf_queue - software structure representing a buffer queue
* @ split_buf : buffer descriptor array
* @ hdr_buf : & libeth_fqe for header buffers
* @ hdr_pp : & page_pool for header buffers
* @ buf : & libeth_fqe for data buffers
* @ pp : & page_pool for data buffers
* @ tail : Tail offset
* @ flags : See enum idpf_queue_flags_t
* @ desc_count : Number of descriptors
* @ next_to_use : Next descriptor to use
* @ next_to_clean : Next descriptor to clean
* @ next_to_alloc : RX buffer to allocate at
* @ hdr_truesize : truesize for buffer headers
* @ truesize : truesize for data buffers
* @ q_id : Queue id
* @ size : Length of descriptor ring in bytes
* @ dma : Physical address of ring
* @ q_vector : Backreference to associated vector
* @ rx_buffer_low_watermark : RX buffer low watermark
* @ rx_hbuf_size : Header buffer size
* @ rx_buf_size : Buffer size
*/
struct idpf_buf_queue {
__cacheline_group_begin_aligned(read_mostly);
struct virtchnl2_splitq_rx_buf_desc *split_buf;
struct libeth_fqe *hdr_buf;
struct page_pool *hdr_pp;
struct libeth_fqe *buf;
struct page_pool *pp;
void __iomem *tail;
DECLARE_BITMAP(flags, __IDPF_Q_FLAGS_NBITS);
u32 desc_count;
__cacheline_group_end_aligned(read_mostly);
__cacheline_group_begin_aligned(read_write);
u32 next_to_use;
u32 next_to_clean;
u32 next_to_alloc;
u32 hdr_truesize;
u32 truesize;
__cacheline_group_end_aligned(read_write);
__cacheline_group_begin_aligned(cold);
u32 q_id;
u32 size;
dma_addr_t dma;
struct idpf_q_vector *q_vector;
u16 rx_buffer_low_watermark;
u16 rx_hbuf_size;
u16 rx_buf_size;
__cacheline_group_end_aligned(cold);
};
libeth_cacheline_set_assert(struct idpf_buf_queue, 64 , 24 , 32 );
/**
* struct idpf_compl_queue - software structure representing a completion queue
* @ comp : completion descriptor array
* @ txq_grp : See struct idpf_txq_group
* @ flags : See enum idpf_queue_flags_t
* @ desc_count : Number of descriptors
* @ clean_budget : queue cleaning budget
* @ netdev : & net_device corresponding to this queue
* @ next_to_use : Next descriptor to use . Relevant in both split & single txq
* and bufq .
* @ next_to_clean : Next descriptor to clean
* @ num_completions : Only relevant for TX completion queue . It tracks the
* number of completions received to compare against the
* number of completions pending , as accumulated by the
* TX queues .
* @ q_id : Queue id
* @ size : Length of descriptor ring in bytes
* @ dma : Physical address of ring
* @ q_vector : Backreference to associated vector
*/
struct idpf_compl_queue {
__cacheline_group_begin_aligned(read_mostly);
struct idpf_splitq_tx_compl_desc *comp;
struct idpf_txq_group *txq_grp;
DECLARE_BITMAP(flags, __IDPF_Q_FLAGS_NBITS);
u32 desc_count;
u32 clean_budget;
struct net_device *netdev;
__cacheline_group_end_aligned(read_mostly);
__cacheline_group_begin_aligned(read_write);
u32 next_to_use;
u32 next_to_clean;
aligned_u64 num_completions;
__cacheline_group_end_aligned(read_write);
__cacheline_group_begin_aligned(cold);
u32 q_id;
u32 size;
dma_addr_t dma;
struct idpf_q_vector *q_vector;
__cacheline_group_end_aligned(cold);
};
libeth_cacheline_set_assert(struct idpf_compl_queue, 40 , 16 , 24 );
/**
* struct idpf_sw_queue
* @ ring : Pointer to the ring
* @ flags : See enum idpf_queue_flags_t
* @ desc_count : Descriptor count
* @ next_to_use : Buffer to allocate at
* @ next_to_clean : Next descriptor to clean
*
* Software queues are used in splitq mode to manage buffers between rxq
* producer and the bufq consumer . These are required in order to maintain a
* lockless buffer management system and are strictly software only constructs .
*/
struct idpf_sw_queue {
__cacheline_group_begin_aligned(read_mostly);
u32 *ring;
DECLARE_BITMAP(flags, __IDPF_Q_FLAGS_NBITS);
u32 desc_count;
__cacheline_group_end_aligned(read_mostly);
__cacheline_group_begin_aligned(read_write);
u32 next_to_use;
u32 next_to_clean;
__cacheline_group_end_aligned(read_write);
};
libeth_cacheline_group_assert(struct idpf_sw_queue, read_mostly, 24 );
libeth_cacheline_group_assert(struct idpf_sw_queue, read_write, 8 );
libeth_cacheline_struct_assert(struct idpf_sw_queue, 24 , 8 );
/**
* struct idpf_rxq_set
* @ rxq : RX queue
* @ refillq : pointers to refill queues
*
* Splitq only . idpf_rxq_set associates an rxq with at an array of refillqs .
* Each rxq needs a refillq to return used buffers back to the respective bufq .
* Bufqs then clean these refillqs for buffers to give to hardware .
*/
struct idpf_rxq_set {
struct idpf_rx_queue rxq;
struct idpf_sw_queue *refillq[IDPF_MAX_BUFQS_PER_RXQ_GRP];
};
/**
* struct idpf_bufq_set
* @ bufq : Buffer queue
* @ num_refillqs : Number of refill queues . This is always equal to num_rxq_sets
* in idpf_rxq_group .
* @ refillqs : Pointer to refill queues array .
*
* Splitq only . idpf_bufq_set associates a bufq to an array of refillqs .
* In this bufq_set , there will be one refillq for each rxq in this rxq_group .
* Used buffers received by rxqs will be put on refillqs which bufqs will
* clean to return new buffers back to hardware .
*
* Buffers needed by some number of rxqs associated in this rxq_group are
* managed by at most two bufqs ( depending on performance configuration ) .
*/
struct idpf_bufq_set {
struct idpf_buf_queue bufq;
int num_refillqs;
struct idpf_sw_queue *refillqs;
};
/**
* struct idpf_rxq_group
* @ vport : Vport back pointer
* @ singleq : Struct with single queue related members
* @ singleq . num_rxq : Number of RX queues associated
* @ singleq . rxqs : Array of RX queue pointers
* @ splitq : Struct with split queue related members
* @ splitq . num_rxq_sets : Number of RX queue sets
* @ splitq . rxq_sets : Array of RX queue sets
* @ splitq . bufq_sets : Buffer queue set pointer
*
* In singleq mode , an rxq_group is simply an array of rxqs . In splitq , a
* rxq_group contains all the rxqs , bufqs and refillqs needed to
* manage buffers in splitq mode .
*/
struct idpf_rxq_group {
struct idpf_vport *vport;
union {
struct {
u16 num_rxq;
struct idpf_rx_queue *rxqs[IDPF_LARGE_MAX_Q];
} singleq;
struct {
u16 num_rxq_sets;
struct idpf_rxq_set *rxq_sets[IDPF_LARGE_MAX_Q];
struct idpf_bufq_set *bufq_sets;
} splitq;
};
};
/**
* struct idpf_txq_group
* @ vport : Vport back pointer
* @ num_txq : Number of TX queues associated
* @ txqs : Array of TX queue pointers
* @ complq : Associated completion queue pointer , split queue only
* @ num_completions_pending : Total number of completions pending for the
* completion queue , acculumated for all TX queues
* associated with that completion queue .
*
* Between singleq and splitq , a txq_group is largely the same except for the
* complq . In splitq a single complq is responsible for handling completions
* for some number of txqs associated in this txq_group .
*/
struct idpf_txq_group {
struct idpf_vport *vport;
u16 num_txq;
struct idpf_tx_queue *txqs[IDPF_LARGE_MAX_Q];
struct idpf_compl_queue *complq;
aligned_u64 num_completions_pending;
};
static inline int idpf_q_vector_to_mem(const struct idpf_q_vector *q_vector)
{
u32 cpu;
if (!q_vector)
return NUMA_NO_NODE;
cpu = cpumask_first(&q_vector->napi.config->affinity_mask);
return cpu < nr_cpu_ids ? cpu_to_mem(cpu) : NUMA_NO_NODE;
}
/**
* idpf_size_to_txd_count - Get number of descriptors needed for large Tx frag
* @ size : transmit request size in bytes
*
* In the case where a large frag ( > = 16 K ) needs to be split across multiple
* descriptors , we need to assume that we can have no more than 12 K of data
* per descriptor due to hardware alignment restrictions ( 4 K alignment ) .
*/
static inline u32 idpf_size_to_txd_count(unsigned int size)
{
return DIV_ROUND_UP(size, IDPF_TX_MAX_DESC_DATA_ALIGNED);
}
/**
* idpf_tx_singleq_build_ctob - populate command tag offset and size
* @ td_cmd : Command to be filled in desc
* @ td_offset : Offset to be filled in desc
* @ size : Size of the buffer
* @ td_tag : td tag to be filled
*
* Returns the 64 bit value populated with the input parameters
*/
static inline __le64 idpf_tx_singleq_build_ctob(u64 td_cmd, u64 td_offset,
unsigned int size, u64 td_tag)
{
return cpu_to_le64(IDPF_TX_DESC_DTYPE_DATA |
(td_cmd << IDPF_TXD_QW1_CMD_S) |
(td_offset << IDPF_TXD_QW1_OFFSET_S) |
((u64)size << IDPF_TXD_QW1_TX_BUF_SZ_S) |
(td_tag << IDPF_TXD_QW1_L2TAG1_S));
}
void idpf_tx_splitq_build_ctb(union idpf_tx_flex_desc *desc,
struct idpf_tx_splitq_params *params,
u16 td_cmd, u16 size);
void idpf_tx_splitq_build_flow_desc(union idpf_tx_flex_desc *desc,
struct idpf_tx_splitq_params *params,
u16 td_cmd, u16 size);
/**
* idpf_tx_splitq_build_desc - determine which type of data descriptor to build
* @ desc : descriptor to populate
* @ params : pointer to tx params struct
* @ td_cmd : command to be filled in desc
* @ size : size of buffer
*/
static inline void idpf_tx_splitq_build_desc(union idpf_tx_flex_desc *desc,
struct idpf_tx_splitq_params *params,
u16 td_cmd, u16 size)
{
if (params->dtype == IDPF_TX_DESC_DTYPE_FLEX_L2TAG1_L2TAG2)
idpf_tx_splitq_build_ctb(desc, params, td_cmd, size);
else
idpf_tx_splitq_build_flow_desc(desc, params, td_cmd, size);
}
/**
* idpf_vport_intr_set_wb_on_itr - enable descriptor writeback on disabled interrupts
* @ q_vector : pointer to queue vector struct
*/
static inline void idpf_vport_intr_set_wb_on_itr(struct idpf_q_vector *q_vector)
{
struct idpf_intr_reg *reg;
if (q_vector->wb_on_itr)
return ;
q_vector->wb_on_itr = true ;
reg = &q_vector->intr_reg;
writel(reg->dyn_ctl_wb_on_itr_m | reg->dyn_ctl_intena_msk_m |
(IDPF_NO_ITR_UPDATE_IDX << reg->dyn_ctl_itridx_s),
reg->dyn_ctl);
}
/**
* idpf_tx_splitq_get_free_bufs - get number of free buf_ids in refillq
* @ refillq : pointer to refillq containing buf_ids
*/
static inline u32 idpf_tx_splitq_get_free_bufs(struct idpf_sw_queue *refillq)
{
return (refillq->next_to_use > refillq->next_to_clean ?
0 : refillq->desc_count) +
refillq->next_to_use - refillq->next_to_clean - 1 ;
}
int idpf_vport_singleq_napi_poll(struct napi_struct *napi, int budget);
void idpf_vport_init_num_qs(struct idpf_vport *vport,
struct virtchnl2_create_vport *vport_msg);
void idpf_vport_calc_num_q_desc(struct idpf_vport *vport);
int idpf_vport_calc_total_qs(struct idpf_adapter *adapter, u16 vport_index,
struct virtchnl2_create_vport *vport_msg,
struct idpf_vport_max_q *max_q);
void idpf_vport_calc_num_q_groups(struct idpf_vport *vport);
int idpf_vport_queues_alloc(struct idpf_vport *vport);
void idpf_vport_queues_rel(struct idpf_vport *vport);
void idpf_vport_intr_rel(struct idpf_vport *vport);
int idpf_vport_intr_alloc(struct idpf_vport *vport);
void idpf_vport_intr_update_itr_ena_irq(struct idpf_q_vector *q_vector);
void idpf_vport_intr_deinit(struct idpf_vport *vport);
int idpf_vport_intr_init(struct idpf_vport *vport);
void idpf_vport_intr_ena(struct idpf_vport *vport);
int idpf_config_rss(struct idpf_vport *vport);
int idpf_init_rss(struct idpf_vport *vport);
void idpf_deinit_rss(struct idpf_vport *vport);
int idpf_rx_bufs_init_all(struct idpf_vport *vport);
void idpf_rx_add_frag(struct idpf_rx_buf *rx_buf, struct sk_buff *skb,
unsigned int size);
struct sk_buff *idpf_rx_build_skb(const struct libeth_fqe *buf, u32 size);
void idpf_tx_buf_hw_update(struct idpf_tx_queue *tx_q, u32 val,
bool xmit_more);
unsigned int idpf_size_to_txd_count(unsigned int size);
netdev_tx_t idpf_tx_drop_skb(struct idpf_tx_queue *tx_q, struct sk_buff *skb);
unsigned int idpf_tx_res_count_required(struct idpf_tx_queue *txq,
struct sk_buff *skb, u32 *buf_count);
void idpf_tx_timeout(struct net_device *netdev, unsigned int txqueue);
netdev_tx_t idpf_tx_singleq_frame(struct sk_buff *skb,
struct idpf_tx_queue *tx_q);
netdev_tx_t idpf_tx_start(struct sk_buff *skb, struct net_device *netdev);
bool idpf_rx_singleq_buf_hw_alloc_all(struct idpf_rx_queue *rxq,
u16 cleaned_count);
int idpf_tso(struct sk_buff *skb, struct idpf_tx_offload_params *off);
#endif /* !_IDPF_TXRX_H_ */
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(vorverarbeitet am 2026-10-03)
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