1/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
  2/*
  3 * Copyright(c) 2020 Intel Corporation.
  4 *
  5 */
  6
  7#ifndef HFI1_NETDEV_H
  8#define HFI1_NETDEV_H
  9
 10#include "hfi.h"
 11
 12#include <linux/netdevice.h>
 13#include <linux/xarray.h>
 14
 15/**
 16 * struct hfi1_netdev_rxq - Receive Queue for HFI
 17 * Both IPoIB and VNIC netdevices will be working on the rx abstraction.
 18 * @napi: napi object
 19 * @rx: ptr to netdev_rx
 20 * @rcd:  ptr to receive context data
 21 */
 22struct hfi1_netdev_rxq {
 23	struct napi_struct napi;
 24	struct hfi1_netdev_rx *rx;
 25	struct hfi1_ctxtdata *rcd;
 26};
 27
 28/*
 29 * Number of netdev contexts used. Ensure it is less than or equal to
 30 * max queues supported by VNIC (HFI1_VNIC_MAX_QUEUE).
 31 */
 32#define HFI1_MAX_NETDEV_CTXTS   8
 33
 34/* Number of NETDEV RSM entries */
 35#define NUM_NETDEV_MAP_ENTRIES HFI1_MAX_NETDEV_CTXTS
 36
 37/**
 38 * struct hfi1_netdev_rx: data required to setup and run HFI netdev.
 39 * @rx_napi:	the dummy netdevice to support "polling" the receive contexts
 40 * @dd:		hfi1_devdata
 41 * @rxq:	pointer to dummy netdev receive queues.
 42 * @num_rx_q:	number of receive queues
 43 * @rmt_index:	first free index in RMT Array
 44 * @msix_start: first free MSI-X interrupt vector.
 45 * @dev_tbl:	netdev table for unique identifier VNIC and IPoIb VLANs.
 46 * @enabled:	atomic counter of netdevs enabling receive queues.
 47 *		When 0 NAPI will be disabled.
 48 * @netdevs:	atomic counter of netdevs using dummy netdev.
 49 *		When 0 receive queues will be freed.
 50 */
 51struct hfi1_netdev_rx {
 52	struct net_device rx_napi;
 53	struct hfi1_devdata *dd;
 54	struct hfi1_netdev_rxq *rxq;
 55	int num_rx_q;
 56	int rmt_start;
 57	struct xarray dev_tbl;
 58	/* count of enabled napi polls */
 59	atomic_t enabled;
 60	/* count of netdevs on top */
 61	atomic_t netdevs;
 62};
 63
 64static inline
 65int hfi1_netdev_ctxt_count(struct hfi1_devdata *dd)
 66{
 67	return dd->netdev_rx->num_rx_q;
 68}
 69
 70static inline
 71struct hfi1_ctxtdata *hfi1_netdev_get_ctxt(struct hfi1_devdata *dd, int ctxt)
 72{
 73	return dd->netdev_rx->rxq[ctxt].rcd;
 74}
 75
 76static inline
 77int hfi1_netdev_get_free_rmt_idx(struct hfi1_devdata *dd)
 78{
 79	return dd->netdev_rx->rmt_start;
 80}
 81
 82static inline
 83void hfi1_netdev_set_free_rmt_idx(struct hfi1_devdata *dd, int rmt_idx)
 84{
 85	dd->netdev_rx->rmt_start = rmt_idx;
 86}
 87
 88u32 hfi1_num_netdev_contexts(struct hfi1_devdata *dd, u32 available_contexts,
 89			     struct cpumask *cpu_mask);
 90
 91void hfi1_netdev_enable_queues(struct hfi1_devdata *dd);
 92void hfi1_netdev_disable_queues(struct hfi1_devdata *dd);
 93int hfi1_netdev_rx_init(struct hfi1_devdata *dd);
 94int hfi1_netdev_rx_destroy(struct hfi1_devdata *dd);
 95int hfi1_alloc_rx(struct hfi1_devdata *dd);
 96void hfi1_free_rx(struct hfi1_devdata *dd);
 97int hfi1_netdev_add_data(struct hfi1_devdata *dd, int id, void *data);
 98void *hfi1_netdev_remove_data(struct hfi1_devdata *dd, int id);
 99void *hfi1_netdev_get_data(struct hfi1_devdata *dd, int id);
100void *hfi1_netdev_get_first_data(struct hfi1_devdata *dd, int *start_id);
101
102/* chip.c  */
103int hfi1_netdev_rx_napi(struct napi_struct *napi, int budget);
104
105#endif /* HFI1_NETDEV_H */