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  */
  22 struct 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  */
  51 struct 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
  64 static inline
  65 int hfi1_netdev_ctxt_count(struct hfi1_devdata *dd)
  66 {
  67         return dd->netdev_rx->num_rx_q;
  68 }
  69
  70 static inline
  71 struct hfi1_ctxtdata *hfi1_netdev_get_ctxt(struct hfi1_devdata *dd, int ctxt)
  72 {
  73         return dd->netdev_rx->rxq[ctxt].rcd;
  74 }
  75
  76 static inline
  77 int hfi1_netdev_get_free_rmt_idx(struct hfi1_devdata *dd)
  78 {
  79         return dd->netdev_rx->rmt_start;
  80 }
  81
  82 static inline
  83 void hfi1_netdev_set_free_rmt_idx(struct hfi1_devdata *dd, int rmt_idx)
  84 {
  85         dd->netdev_rx->rmt_start = rmt_idx;
  86 }
  87
  88 u32 hfi1_num_netdev_contexts(struct hfi1_devdata *dd, u32 available_contexts,
  89                              struct cpumask *cpu_mask);
  90
  91 void hfi1_netdev_enable_queues(struct hfi1_devdata *dd);
  92 void hfi1_netdev_disable_queues(struct hfi1_devdata *dd);
  93 int hfi1_netdev_rx_init(struct hfi1_devdata *dd);
  94 int hfi1_netdev_rx_destroy(struct hfi1_devdata *dd);
  95 int hfi1_alloc_rx(struct hfi1_devdata *dd);
  96 void hfi1_free_rx(struct hfi1_devdata *dd);
  97 int hfi1_netdev_add_data(struct hfi1_devdata *dd, int id, void *data);
  98 void *hfi1_netdev_remove_data(struct hfi1_devdata *dd, int id);
  99 void *hfi1_netdev_get_data(struct hfi1_devdata *dd, int id);
 100 void *hfi1_netdev_get_first_data(struct hfi1_devdata *dd, int *start_id);
 101
 102 /* chip.c  */
 103 int hfi1_netdev_rx_napi(struct napi_struct *napi, int budget);
 104
 105 #endif /* HFI1_NETDEV_H */