LXR linux/drivers/net/ethernet/marvell/octeontx2/nic/otx2

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* Marvell OcteonTx2 RVU Ethernet driver
   3 *
   4 * Copyright (C) 2020 Marvell International Ltd.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#ifndef OTX2_TXRX_H
  12#define OTX2_TXRX_H
  13
  14#include <linux/etherdevice.h>
  15#include <linux/iommu.h>
  16#include <linux/if_vlan.h>
  17
  18#define LBK_CHAN_BASE   0x000
  19#define SDP_CHAN_BASE   0x700
  20#define CGX_CHAN_BASE   0x800
  21
  22#define OTX2_DATA_ALIGN(X)      ALIGN(X, OTX2_ALIGN)
  23#define OTX2_HEAD_ROOM          OTX2_ALIGN
  24
  25#define OTX2_ETH_HLEN           (VLAN_ETH_HLEN + VLAN_HLEN)
  26#define OTX2_MIN_MTU            64
  27#define OTX2_MAX_MTU            (9212 - OTX2_ETH_HLEN)
  28
  29#define OTX2_MAX_GSO_SEGS       255
  30#define OTX2_MAX_FRAGS_IN_SQE   9
  31
  32/* Rx buffer size should be in multiples of 128bytes */
  33#define RCV_FRAG_LEN1(x)                                \
  34                ((OTX2_HEAD_ROOM + OTX2_DATA_ALIGN(x)) + \
  35                OTX2_DATA_ALIGN(sizeof(struct skb_shared_info)))
  36
  37/* Prefer 2048 byte buffers for better last level cache
  38 * utilization or data distribution across regions.
  39 */
  40#define RCV_FRAG_LEN(x) \
  41                ((RCV_FRAG_LEN1(x) < 2048) ? 2048 : RCV_FRAG_LEN1(x))
  42
  43#define DMA_BUFFER_LEN(x)               \
  44                ((x) - OTX2_HEAD_ROOM - \
  45                OTX2_DATA_ALIGN(sizeof(struct skb_shared_info)))
  46
  47/* IRQ triggered when NIX_LF_CINTX_CNT[ECOUNT]
  48 * is equal to this value.
  49 */
  50#define CQ_CQE_THRESH_DEFAULT   10
  51
  52/* IRQ triggered when NIX_LF_CINTX_CNT[ECOUNT]
  53 * is nonzero and this much time elapses after that.
  54 */
  55#define CQ_TIMER_THRESH_DEFAULT 1  /* 1 usec */
  56#define CQ_TIMER_THRESH_MAX     25 /* 25 usec */
  57
  58/* Min number of CQs (of the ones mapped to this CINT)
  59 * with valid CQEs.
  60 */
  61#define CQ_QCOUNT_DEFAULT       1
  62
  63struct queue_stats {
  64        u64     bytes;
  65        u64     pkts;
  66};
  67
  68struct otx2_rcv_queue {
  69        struct queue_stats      stats;
  70};
  71
  72struct sg_list {
  73        u16     num_segs;
  74        u64     skb;
  75        u64     size[OTX2_MAX_FRAGS_IN_SQE];
  76        u64     dma_addr[OTX2_MAX_FRAGS_IN_SQE];
  77};
  78
  79struct otx2_snd_queue {
  80        u8                      aura_id;
  81        u16                     head;
  82        u16                     sqe_size;
  83        u32                     sqe_cnt;
  84        u16                     num_sqbs;
  85        u16                     sqe_thresh;
  86        u8                      sqe_per_sqb;
  87        u64                      io_addr;
  88        u64                     *aura_fc_addr;
  89        u64                     *lmt_addr;
  90        void                    *sqe_base;
  91        struct qmem             *sqe;
  92        struct qmem             *tso_hdrs;
  93        struct sg_list          *sg;
  94        struct queue_stats      stats;
  95        u16                     sqb_count;
  96        u64                     *sqb_ptrs;
  97} ____cacheline_aligned_in_smp;
  98
  99enum cq_type {
 100        CQ_RX,
 101        CQ_TX,
 102        CQS_PER_CINT = 2, /* RQ + SQ */
 103};
 104
 105struct otx2_cq_poll {
 106        void                    *dev;
 107#define CINT_INVALID_CQ         255
 108        u8                      cint_idx;
 109        u8                      cq_ids[CQS_PER_CINT];
 110        struct napi_struct      napi;
 111};
 112
 113struct otx2_pool {
 114        struct qmem             *stack;
 115        struct qmem             *fc_addr;
 116        u8                      rbpage_order;
 117        u16                     rbsize;
 118        u32                     page_offset;
 119        u16                     pageref;
 120        struct page             *page;
 121};
 122
 123struct otx2_cq_queue {
 124        u8                      cq_idx;
 125        u8                      cq_type;
 126        u8                      cint_idx; /* CQ interrupt id */
 127        u8                      refill_task_sched;
 128        u16                     cqe_size;
 129        u16                     pool_ptrs;
 130        u32                     cqe_cnt;
 131        u32                     cq_head;
 132        void                    *cqe_base;
 133        struct qmem             *cqe;
 134        struct otx2_pool        *rbpool;
 135} ____cacheline_aligned_in_smp;
 136
 137struct otx2_qset {
 138        u32                     rqe_cnt;
 139        u32                     sqe_cnt; /* Keep these two at top */
 140#define OTX2_MAX_CQ_CNT         64
 141        u16                     cq_cnt;
 142        u16                     xqe_size;
 143        struct otx2_pool        *pool;
 144        struct otx2_cq_poll     *napi;
 145        struct otx2_cq_queue    *cq;
 146        struct otx2_snd_queue   *sq;
 147        struct otx2_rcv_queue   *rq;
 148};
 149
 150/* Translate IOVA to physical address */
 151static inline u64 otx2_iova_to_phys(void *iommu_domain, dma_addr_t dma_addr)
 152{
 153        /* Translation is installed only when IOMMU is present */
 154        if (likely(iommu_domain))
 155                return iommu_iova_to_phys(iommu_domain, dma_addr);
 156        return dma_addr;
 157}
 158
 159int otx2_napi_handler(struct napi_struct *napi, int budget);
 160bool otx2_sq_append_skb(struct net_device *netdev, struct otx2_snd_queue *sq,
 161                        struct sk_buff *skb, u16 qidx);
 162#endif /* OTX2_TXRX_H */
 163