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 ipoib_txreq - IPOIB transmit descriptor 48 * @txreq: sdma transmit request 49 * @sdma_hdr: 9b ib headers 50 * @sdma_status: status returned by sdma engine 51 * @complete: non-zero implies complete 52 * @priv: ipoib netdev private data 53 * @txq: txq on which skb was output 54 * @skb: skb to send 55 */ 56 struct ipoib_txreq { 57 struct sdma_txreq txreq; 58 struct hfi1_sdma_header *sdma_hdr; 59 int sdma_status; 60 int complete; 61 struct hfi1_ipoib_dev_priv *priv; 62 struct hfi1_ipoib_txq *txq; 63 struct sk_buff *skb; 64 }; 65 66 /** 67 * struct hfi1_ipoib_circ_buf - List of items to be processed 68 * @items: ring of items each a power of two size 69 * @max_items: max items + 1 that the ring can contain 70 * @shift: log2 of size for getting txreq 71 * @sent_txreqs: count of txreqs posted to sdma 72 * @tail: ring tail 73 * @stops: count of stops of queue 74 * @ring_full: ring has been filled 75 * @no_desc: descriptor shortage seen 76 * @complete_txreqs: count of txreqs completed by sdma 77 * @head: ring head 78 */ 79 struct hfi1_ipoib_circ_buf { 80 void *items; 81 u32 max_items; 82 u32 shift; 83 /* consumer cache line */ 84 u64 ____cacheline_aligned_in_smp sent_txreqs; 85 u32 avail; 86 u32 tail; 87 atomic_t stops; 88 atomic_t ring_full; 89 atomic_t no_desc; 90 /* producer cache line */ 91 u64 ____cacheline_aligned_in_smp complete_txreqs; 92 u32 head; 93 }; 94 95 /** 96 * struct hfi1_ipoib_txq - IPOIB per Tx queue information 97 * @priv: private pointer 98 * @sde: sdma engine 99 * @tx_list: tx request list 100 * @sent_txreqs: count of txreqs posted to sdma 101 * @flow: tracks when list needs to be flushed for a flow change 102 * @q_idx: ipoib Tx queue index 103 * @pkts_sent: indicator packets have been sent from this queue 104 * @wait: iowait structure 105 * @napi: pointer to tx napi interface 106 * @tx_ring: ring of ipoib txreqs to be reaped by napi callback 107 */ 108 struct hfi1_ipoib_txq { 109 struct napi_struct napi; 110 struct hfi1_ipoib_dev_priv *priv; 111 struct sdma_engine *sde; 112 struct list_head tx_list; 113 union hfi1_ipoib_flow flow; 114 u8 q_idx; 115 bool pkts_sent; 116 struct iowait wait; 117 118 struct hfi1_ipoib_circ_buf ____cacheline_aligned_in_smp tx_ring; 119 }; 120 121 struct hfi1_ipoib_dev_priv { 122 struct hfi1_devdata *dd; 123 struct net_device *netdev; 124 struct ib_device *device; 125 struct hfi1_ipoib_txq *txqs; 126 const struct net_device_ops *netdev_ops; 127 struct rvt_qp *qp; 128 u32 qkey; 129 u16 pkey; 130 u16 pkey_index; 131 u8 port_num; 132 }; 133 134 /* hfi1 ipoib rdma netdev's private data structure */ 135 struct hfi1_ipoib_rdma_netdev { 136 struct rdma_netdev rn; /* keep this first */ 137 /* followed by device private data */ 138 struct hfi1_ipoib_dev_priv dev_priv; 139 }; 140 141 static inline struct hfi1_ipoib_dev_priv * hfi1_ipoib_priv(const struct net_device * dev)142hfi1_ipoib_priv(const struct net_device *dev) 143 { 144 return &((struct hfi1_ipoib_rdma_netdev *)netdev_priv(dev))->dev_priv; 145 } 146 147 int hfi1_ipoib_send(struct net_device *dev, 148 struct sk_buff *skb, 149 struct ib_ah *address, 150 u32 dqpn); 151 152 int hfi1_ipoib_txreq_init(struct hfi1_ipoib_dev_priv *priv); 153 void hfi1_ipoib_txreq_deinit(struct hfi1_ipoib_dev_priv *priv); 154 155 int hfi1_ipoib_rxq_init(struct net_device *dev); 156 void hfi1_ipoib_rxq_deinit(struct net_device *dev); 157 158 void hfi1_ipoib_napi_tx_enable(struct net_device *dev); 159 void hfi1_ipoib_napi_tx_disable(struct net_device *dev); 160 161 struct sk_buff *hfi1_ipoib_prepare_skb(struct hfi1_netdev_rxq *rxq, 162 int size, void *data); 163 164 int hfi1_ipoib_rn_get_params(struct ib_device *device, 165 u32 port_num, 166 enum rdma_netdev_t type, 167 struct rdma_netdev_alloc_params *params); 168 169 void hfi1_ipoib_tx_timeout(struct net_device *dev, unsigned int q); 170 171 #endif /* _IPOIB_H */ 172