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