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 ipoib_txreq; 56 struct hfi1_ipoib_circ_buf { 57 struct ipoib_txreq **items; 58 unsigned long head; 59 unsigned long tail; 60 unsigned long max_items; 61 spinlock_t producer_lock; /* head sync lock */ 62 spinlock_t consumer_lock; /* tail sync lock */ 63 }; 64 65 /** 66 * struct hfi1_ipoib_txq - IPOIB per Tx queue information 67 * @priv: private pointer 68 * @sde: sdma engine 69 * @tx_list: tx request list 70 * @sent_txreqs: count of txreqs posted to sdma 71 * @stops: count of stops of queue 72 * @ring_full: ring has been filled 73 * @no_desc: descriptor shortage seen 74 * @flow: tracks when list needs to be flushed for a flow change 75 * @q_idx: ipoib Tx queue index 76 * @pkts_sent: indicator packets have been sent from this queue 77 * @wait: iowait structure 78 * @complete_txreqs: count of txreqs completed by sdma 79 * @napi: pointer to tx napi interface 80 * @tx_ring: ring of ipoib txreqs to be reaped by napi callback 81 */ 82 struct hfi1_ipoib_txq { 83 struct hfi1_ipoib_dev_priv *priv; 84 struct sdma_engine *sde; 85 struct list_head tx_list; 86 u64 sent_txreqs; 87 atomic_t stops; 88 atomic_t ring_full; 89 atomic_t no_desc; 90 union hfi1_ipoib_flow flow; 91 u8 q_idx; 92 bool pkts_sent; 93 struct iowait wait; 94 95 atomic64_t ____cacheline_aligned_in_smp complete_txreqs; 96 struct napi_struct *napi; 97 struct hfi1_ipoib_circ_buf tx_ring; 98 }; 99 100 struct hfi1_ipoib_dev_priv { 101 struct hfi1_devdata *dd; 102 struct net_device *netdev; 103 struct ib_device *device; 104 struct hfi1_ipoib_txq *txqs; 105 struct kmem_cache *txreq_cache; 106 struct napi_struct *tx_napis; 107 u16 pkey; 108 u16 pkey_index; 109 u32 qkey; 110 u8 port_num; 111 112 const struct net_device_ops *netdev_ops; 113 struct rvt_qp *qp; 114 }; 115 116 /* hfi1 ipoib rdma netdev's private data structure */ 117 struct hfi1_ipoib_rdma_netdev { 118 struct rdma_netdev rn; /* keep this first */ 119 /* followed by device private data */ 120 struct hfi1_ipoib_dev_priv dev_priv; 121 }; 122 123 static inline struct hfi1_ipoib_dev_priv * 124 hfi1_ipoib_priv(const struct net_device *dev) 125 { 126 return &((struct hfi1_ipoib_rdma_netdev *)netdev_priv(dev))->dev_priv; 127 } 128 129 int hfi1_ipoib_send(struct net_device *dev, 130 struct sk_buff *skb, 131 struct ib_ah *address, 132 u32 dqpn); 133 134 int hfi1_ipoib_txreq_init(struct hfi1_ipoib_dev_priv *priv); 135 void hfi1_ipoib_txreq_deinit(struct hfi1_ipoib_dev_priv *priv); 136 137 int hfi1_ipoib_rxq_init(struct net_device *dev); 138 void hfi1_ipoib_rxq_deinit(struct net_device *dev); 139 140 void hfi1_ipoib_napi_tx_enable(struct net_device *dev); 141 void hfi1_ipoib_napi_tx_disable(struct net_device *dev); 142 143 struct sk_buff *hfi1_ipoib_prepare_skb(struct hfi1_netdev_rxq *rxq, 144 int size, void *data); 145 146 int hfi1_ipoib_rn_get_params(struct ib_device *device, 147 u32 port_num, 148 enum rdma_netdev_t type, 149 struct rdma_netdev_alloc_params *params); 150 151 void hfi1_ipoib_tx_timeout(struct net_device *dev, unsigned int q); 152 153 #endif /* _IPOIB_H */ 154