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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 functionality9 */10 11#ifndef HFI1_IPOIB_H12#define HFI1_IPOIB_H13 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 2430 31#define HFI1_IPOIB_TXREQ_NAME_LEN 3232 33#define HFI1_IPOIB_PSEUDO_LEN 2034#define HFI1_IPOIB_ENCAP_LEN 435 36struct hfi1_ipoib_dev_priv;37 38union 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 descriptor48 * @txreq: sdma transmit request49 * @sdma_hdr: 9b ib headers50 * @sdma_status: status returned by sdma engine51 * @complete: non-zero implies complete52 * @priv: ipoib netdev private data53 * @txq: txq on which skb was output54 * @skb: skb to send55 */56struct 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 processed68 * @items: ring of items each a power of two size69 * @max_items: max items + 1 that the ring can contain70 * @shift: log2 of size for getting txreq71 * @sent_txreqs: count of txreqs posted to sdma72 * @tail: ring tail73 * @stops: count of stops of queue74 * @ring_full: ring has been filled75 * @no_desc: descriptor shortage seen76 * @complete_txreqs: count of txreqs completed by sdma77 * @head: ring head78 */79struct 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 information97 * @priv: private pointer98 * @sde: sdma engine99 * @tx_list: tx request list100 * @sent_txreqs: count of txreqs posted to sdma101 * @flow: tracks when list needs to be flushed for a flow change102 * @q_idx: ipoib Tx queue index103 * @pkts_sent: indicator packets have been sent from this queue104 * @wait: iowait structure105 * @napi: pointer to tx napi interface106 * @tx_ring: ring of ipoib txreqs to be reaped by napi callback107 */108struct 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 121struct 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 */135struct 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 141static inline struct hfi1_ipoib_dev_priv *142hfi1_ipoib_priv(const struct net_device *dev)143{144 return &((struct hfi1_ipoib_rdma_netdev *)netdev_priv(dev))->dev_priv;145}146 147int hfi1_ipoib_send(struct net_device *dev,148 struct sk_buff *skb,149 struct ib_ah *address,150 u32 dqpn);151 152int hfi1_ipoib_txreq_init(struct hfi1_ipoib_dev_priv *priv);153void hfi1_ipoib_txreq_deinit(struct hfi1_ipoib_dev_priv *priv);154 155int hfi1_ipoib_rxq_init(struct net_device *dev);156void hfi1_ipoib_rxq_deinit(struct net_device *dev);157 158void hfi1_ipoib_napi_tx_enable(struct net_device *dev);159void hfi1_ipoib_napi_tx_disable(struct net_device *dev);160 161struct sk_buff *hfi1_ipoib_prepare_skb(struct hfi1_netdev_rxq *rxq,162 int size, void *data);163 164int 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 169void hfi1_ipoib_tx_timeout(struct net_device *dev, unsigned int q);170 171#endif /* _IPOIB_H */172