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