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
hfi1_netdev_priv(struct net_device * dev)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
hfi1_netdev_ctxt_count(struct hfi1_devdata * dd)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
hfi1_netdev_get_ctxt(struct hfi1_devdata * dd,int ctxt)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
hfi1_netdev_get_free_rmt_idx(struct hfi1_devdata * dd)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
hfi1_netdev_set_free_rmt_idx(struct hfi1_devdata * dd,int rmt_idx)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 */
119
