drivers/infiniband/hw/hfi1/ipoib.h

   1 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
   2 /*
   3  * Copyright(c) 2020 Intel Corporation.
   4  *
   5  */
   6
   7 /*
   8  * This file contains HFI1 support for IPOIB functionality
   9  */
  10
  11 #ifndef HFI1_IPOIB_H
  12 #define HFI1_IPOIB_H
  13
  14 #include <linux/types.h>
  15 #include <linux/stddef.h>
  16 #include <linux/atomic.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/slab.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/list.h>
  21 #include <linux/if_infiniband.h>
  22
  23 #include "hfi.h"
  24 #include "iowait.h"
  25 #include "netdev.h"
  26
  27 #include <rdma/ib_verbs.h>
  28
  29 #define HFI1_IPOIB_ENTROPY_SHIFT   24
  30
  31 #define HFI1_IPOIB_TXREQ_NAME_LEN   32
  32
  33 #define HFI1_IPOIB_PSEUDO_LEN 20
  34 #define HFI1_IPOIB_ENCAP_LEN 4
  35
  36 struct hfi1_ipoib_dev_priv;
  37
  38 union hfi1_ipoib_flow {
  39         u16 as_int;
  40         struct {
  41                 u8 tx_queue;
  42                 u8 sc5;
  43         } __attribute__((__packed__));
  44 };
  45
  46 /**
  47  * struct hfi1_ipoib_circ_buf - List of items to be processed
  48  * @items: ring of items
  49  * @head: ring head
  50  * @tail: ring tail
  51  * @max_items: max items + 1 that the ring can contain
  52  * @producer_lock: producer sync lock
  53  * @consumer_lock: consumer sync lock
  54  */
  55 struct hfi1_ipoib_circ_buf {
  56         void **items;
  57         unsigned long head;
  58         unsigned long tail;
  59         unsigned long max_items;
  60         spinlock_t producer_lock; /* head sync lock */
  61         spinlock_t consumer_lock; /* tail sync lock */
  62 };
  63
  64 /**
  65  * struct hfi1_ipoib_txq - IPOIB per Tx queue information
  66  * @priv: private pointer
  67  * @sde: sdma engine
  68  * @tx_list: tx request list
  69  * @sent_txreqs: count of txreqs posted to sdma
  70  * @stops: count of stops of queue
  71  * @ring_full: ring has been filled
  72  * @no_desc: descriptor shortage seen
  73  * @flow: tracks when list needs to be flushed for a flow change
  74  * @q_idx: ipoib Tx queue index
  75  * @pkts_sent: indicator packets have been sent from this queue
  76  * @wait: iowait structure
  77  * @complete_txreqs: count of txreqs completed by sdma
  78  * @napi: pointer to tx napi interface
  79  * @tx_ring: ring of ipoib txreqs to be reaped by napi callback
  80  */
  81 struct hfi1_ipoib_txq {
  82         struct hfi1_ipoib_dev_priv *priv;
  83         struct sdma_engine *sde;
  84         struct list_head tx_list;
  85         u64 sent_txreqs;
  86         atomic_t stops;
  87         atomic_t ring_full;
  88         atomic_t no_desc;
  89         union hfi1_ipoib_flow flow;
  90         u8 q_idx;
  91         bool pkts_sent;
  92         struct iowait wait;
  93
  94         atomic64_t ____cacheline_aligned_in_smp complete_txreqs;
  95         struct napi_struct *napi;
  96         struct hfi1_ipoib_circ_buf tx_ring;
  97 };
  98
  99 struct hfi1_ipoib_dev_priv {
 100         struct hfi1_devdata *dd;
 101         struct net_device   *netdev;
 102         struct ib_device    *device;
 103         struct hfi1_ipoib_txq *txqs;
 104         struct kmem_cache *txreq_cache;
 105         struct napi_struct *tx_napis;
 106         u16 pkey;
 107         u16 pkey_index;
 108         u32 qkey;
 109         u8 port_num;
 110
 111         const struct net_device_ops *netdev_ops;
 112         struct rvt_qp *qp;
 113 };
 114
 115 /* hfi1 ipoib rdma netdev's private data structure */
 116 struct hfi1_ipoib_rdma_netdev {
 117         struct rdma_netdev rn;  /* keep this first */
 118         /* followed by device private data */
 119         struct hfi1_ipoib_dev_priv dev_priv;
 120 };
 121
 122 static inline struct hfi1_ipoib_dev_priv *
 123 hfi1_ipoib_priv(const struct net_device *dev)
 124 {
 125         return &((struct hfi1_ipoib_rdma_netdev *)netdev_priv(dev))->dev_priv;
 126 }
 127
 128 int hfi1_ipoib_send_dma(struct net_device *dev,
 129                         struct sk_buff *skb,
 130                         struct ib_ah *address,
 131                         u32 dqpn);
 132
 133 int hfi1_ipoib_txreq_init(struct hfi1_ipoib_dev_priv *priv);
 134 void hfi1_ipoib_txreq_deinit(struct hfi1_ipoib_dev_priv *priv);
 135
 136 int hfi1_ipoib_rxq_init(struct net_device *dev);
 137 void hfi1_ipoib_rxq_deinit(struct net_device *dev);
 138
 139 void hfi1_ipoib_napi_tx_enable(struct net_device *dev);
 140 void hfi1_ipoib_napi_tx_disable(struct net_device *dev);
 141
 142 struct sk_buff *hfi1_ipoib_prepare_skb(struct hfi1_netdev_rxq *rxq,
 143                                        int size, void *data);
 144
 145 int hfi1_ipoib_rn_get_params(struct ib_device *device,
 146                              u8 port_num,
 147                              enum rdma_netdev_t type,
 148                              struct rdma_netdev_alloc_params *params);
 149
 150 #endif /* _IPOIB_H */