172 lines
4.3 KiB
C
172 lines
4.3 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
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/*
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* Copyright(c) 2020 Intel Corporation.
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*
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*/
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/*
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* This file contains HFI1 support for IPOIB functionality
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*/
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#ifndef HFI1_IPOIB_H
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#define HFI1_IPOIB_H
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#include <linux/types.h>
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#include <linux/stddef.h>
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#include <linux/atomic.h>
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/list.h>
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#include <linux/if_infiniband.h>
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#include "hfi.h"
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#include "iowait.h"
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#include "netdev.h"
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#include <rdma/ib_verbs.h>
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#define HFI1_IPOIB_ENTROPY_SHIFT 24
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#define HFI1_IPOIB_TXREQ_NAME_LEN 32
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#define HFI1_IPOIB_PSEUDO_LEN 20
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#define HFI1_IPOIB_ENCAP_LEN 4
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struct hfi1_ipoib_dev_priv;
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union hfi1_ipoib_flow {
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u16 as_int;
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struct {
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u8 tx_queue;
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u8 sc5;
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} __attribute__((__packed__));
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};
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/**
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* struct ipoib_txreq - IPOIB transmit descriptor
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* @txreq: sdma transmit request
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* @sdma_hdr: 9b ib headers
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* @sdma_status: status returned by sdma engine
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* @complete: non-zero implies complete
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* @priv: ipoib netdev private data
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* @txq: txq on which skb was output
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* @skb: skb to send
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*/
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struct ipoib_txreq {
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struct sdma_txreq txreq;
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struct hfi1_sdma_header *sdma_hdr;
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int sdma_status;
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int complete;
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struct hfi1_ipoib_dev_priv *priv;
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struct hfi1_ipoib_txq *txq;
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struct sk_buff *skb;
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};
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/**
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* struct hfi1_ipoib_circ_buf - List of items to be processed
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* @items: ring of items each a power of two size
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* @max_items: max items + 1 that the ring can contain
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* @shift: log2 of size for getting txreq
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* @sent_txreqs: count of txreqs posted to sdma
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* @tail: ring tail
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* @stops: count of stops of queue
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* @ring_full: ring has been filled
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* @no_desc: descriptor shortage seen
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* @complete_txreqs: count of txreqs completed by sdma
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* @head: ring head
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*/
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struct hfi1_ipoib_circ_buf {
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void *items;
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u32 max_items;
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u32 shift;
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/* consumer cache line */
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u64 ____cacheline_aligned_in_smp sent_txreqs;
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u32 avail;
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u32 tail;
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atomic_t stops;
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atomic_t ring_full;
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atomic_t no_desc;
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/* producer cache line */
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u64 ____cacheline_aligned_in_smp complete_txreqs;
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u32 head;
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};
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/**
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* struct hfi1_ipoib_txq - IPOIB per Tx queue information
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* @priv: private pointer
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* @sde: sdma engine
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* @tx_list: tx request list
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* @sent_txreqs: count of txreqs posted to sdma
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* @flow: tracks when list needs to be flushed for a flow change
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* @q_idx: ipoib Tx queue index
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* @pkts_sent: indicator packets have been sent from this queue
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* @wait: iowait structure
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* @napi: pointer to tx napi interface
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* @tx_ring: ring of ipoib txreqs to be reaped by napi callback
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*/
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struct hfi1_ipoib_txq {
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struct napi_struct napi;
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struct hfi1_ipoib_dev_priv *priv;
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struct sdma_engine *sde;
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struct list_head tx_list;
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union hfi1_ipoib_flow flow;
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u8 q_idx;
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bool pkts_sent;
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struct iowait wait;
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struct hfi1_ipoib_circ_buf ____cacheline_aligned_in_smp tx_ring;
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};
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struct hfi1_ipoib_dev_priv {
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struct hfi1_devdata *dd;
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struct net_device *netdev;
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struct ib_device *device;
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struct hfi1_ipoib_txq *txqs;
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const struct net_device_ops *netdev_ops;
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struct rvt_qp *qp;
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u32 qkey;
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u16 pkey;
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u16 pkey_index;
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u8 port_num;
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};
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/* hfi1 ipoib rdma netdev's private data structure */
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struct hfi1_ipoib_rdma_netdev {
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struct rdma_netdev rn; /* keep this first */
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/* followed by device private data */
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struct hfi1_ipoib_dev_priv dev_priv;
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};
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static inline struct hfi1_ipoib_dev_priv *
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hfi1_ipoib_priv(const struct net_device *dev)
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{
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return &((struct hfi1_ipoib_rdma_netdev *)netdev_priv(dev))->dev_priv;
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}
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int hfi1_ipoib_send(struct net_device *dev,
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struct sk_buff *skb,
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struct ib_ah *address,
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u32 dqpn);
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int hfi1_ipoib_txreq_init(struct hfi1_ipoib_dev_priv *priv);
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void hfi1_ipoib_txreq_deinit(struct hfi1_ipoib_dev_priv *priv);
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int hfi1_ipoib_rxq_init(struct net_device *dev);
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void hfi1_ipoib_rxq_deinit(struct net_device *dev);
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void hfi1_ipoib_napi_tx_enable(struct net_device *dev);
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void hfi1_ipoib_napi_tx_disable(struct net_device *dev);
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struct sk_buff *hfi1_ipoib_prepare_skb(struct hfi1_netdev_rxq *rxq,
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int size, void *data);
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int hfi1_ipoib_rn_get_params(struct ib_device *device,
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u32 port_num,
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enum rdma_netdev_t type,
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struct rdma_netdev_alloc_params *params);
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void hfi1_ipoib_tx_timeout(struct net_device *dev, unsigned int q);
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#endif /* _IPOIB_H */
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