LXR linux/drivers/infiniband/hw/hfi1/netdev.h

   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 */
 106