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 */
106