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  * dummy netdev. Both IPoIB and VNIC netdevices will be working on
  18  * top of this device.
  19  * @napi: napi object
  20  * @priv: ptr to netdev_priv
  21  * @rcd:  ptr to receive context data
  22  */
  23 struct hfi1_netdev_rxq {
  24         struct napi_struct napi;
  25         struct hfi1_netdev_priv *priv;
  26         struct hfi1_ctxtdata *rcd;
  27 };
  28
  29 /*
  30  * Number of netdev contexts used. Ensure it is less than or equal to
  31  * max queues supported by VNIC (HFI1_VNIC_MAX_QUEUE).
  32  */
  33 #define HFI1_MAX_NETDEV_CTXTS   8
  34
  35 /* Number of NETDEV RSM entries */
  36 #define NUM_NETDEV_MAP_ENTRIES HFI1_MAX_NETDEV_CTXTS
  37
  38 /**
  39  * struct hfi1_netdev_priv: data required to setup and run HFI netdev.
  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  */
  51 struct hfi1_netdev_priv {
  52         struct hfi1_devdata *dd;
  53         struct hfi1_netdev_rxq *rxq;
  54         int num_rx_q;
  55         int rmt_start;
  56         struct xarray dev_tbl;
  57         /* count of enabled napi polls */
  58         atomic_t enabled;
  59         /* count of netdevs on top */
  60         atomic_t netdevs;
  61 };
  62
  63 static inline
  64 struct hfi1_netdev_priv *hfi1_netdev_priv(struct net_device *dev)
  65 {
  66         return (struct hfi1_netdev_priv *)&dev[1];
  67 }
  68
  69 static inline
  70 int hfi1_netdev_ctxt_count(struct hfi1_devdata *dd)
  71 {
  72         struct hfi1_netdev_priv *priv = hfi1_netdev_priv(dd->dummy_netdev);
  73
  74         return priv->num_rx_q;
  75 }
  76
  77 static inline
  78 struct hfi1_ctxtdata *hfi1_netdev_get_ctxt(struct hfi1_devdata *dd, int ctxt)
  79 {
  80         struct hfi1_netdev_priv *priv = hfi1_netdev_priv(dd->dummy_netdev);
  81
  82         return priv->rxq[ctxt].rcd;
  83 }
  84
  85 static inline
  86 int hfi1_netdev_get_free_rmt_idx(struct hfi1_devdata *dd)
  87 {
  88         struct hfi1_netdev_priv *priv = hfi1_netdev_priv(dd->dummy_netdev);
  89
  90         return priv->rmt_start;
  91 }
  92
  93 static inline
  94 void hfi1_netdev_set_free_rmt_idx(struct hfi1_devdata *dd, int rmt_idx)
  95 {
  96         struct hfi1_netdev_priv *priv = hfi1_netdev_priv(dd->dummy_netdev);
  97
  98         priv->rmt_start = rmt_idx;
  99 }
 100
 101 u32 hfi1_num_netdev_contexts(struct hfi1_devdata *dd, u32 available_contexts,
 102                              struct cpumask *cpu_mask);
 103
 104 void hfi1_netdev_enable_queues(struct hfi1_devdata *dd);
 105 void hfi1_netdev_disable_queues(struct hfi1_devdata *dd);
 106 int hfi1_netdev_rx_init(struct hfi1_devdata *dd);
 107 int hfi1_netdev_rx_destroy(struct hfi1_devdata *dd);
 108 int hfi1_netdev_alloc(struct hfi1_devdata *dd);
 109 void hfi1_netdev_free(struct hfi1_devdata *dd);
 110 int hfi1_netdev_add_data(struct hfi1_devdata *dd, int id, void *data);
 111 void *hfi1_netdev_remove_data(struct hfi1_devdata *dd, int id);
 112 void *hfi1_netdev_get_data(struct hfi1_devdata *dd, int id);
 113 void *hfi1_netdev_get_first_data(struct hfi1_devdata *dd, int *start_id);
 114
 115 /* chip.c  */
 116 int hfi1_netdev_rx_napi(struct napi_struct *napi, int budget);
 117
 118 #endif /* HFI1_NETDEV_H */