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
hfi1_netdev_ctxt_count(struct hfi1_devdata * dd)65 int hfi1_netdev_ctxt_count(struct hfi1_devdata *dd)
66 {
67 return dd->netdev_rx->num_rx_q;
68 }
69
70 static inline
hfi1_netdev_get_ctxt(struct hfi1_devdata * dd,int ctxt)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
hfi1_netdev_get_free_rmt_idx(struct hfi1_devdata * dd)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
hfi1_netdev_set_free_rmt_idx(struct hfi1_devdata * dd,int rmt_idx)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 */
106