1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause 2 /* 3 * Copyright(c) 2016 - 2019 Intel Corporation. 4 */ 5 6 #include <linux/slab.h> 7 #include "ah.h" 8 #include "vt.h" /* for prints */ 9 10 /** 11 * rvt_check_ah - validate the attributes of AH 12 * @ibdev: the ib device 13 * @ah_attr: the attributes of the AH 14 * 15 * If driver supports a more detailed check_ah function call back to it 16 * otherwise just check the basics. 17 * 18 * Return: 0 on success 19 */ 20 int rvt_check_ah(struct ib_device *ibdev, 21 struct rdma_ah_attr *ah_attr) 22 { 23 int err; 24 int port_num = rdma_ah_get_port_num(ah_attr); 25 struct ib_port_attr port_attr; 26 struct rvt_dev_info *rdi = ib_to_rvt(ibdev); 27 u8 ah_flags = rdma_ah_get_ah_flags(ah_attr); 28 u8 static_rate = rdma_ah_get_static_rate(ah_attr); 29 30 err = ib_query_port(ibdev, port_num, &port_attr); 31 if (err) 32 return -EINVAL; 33 if (port_num < 1 || 34 port_num > ibdev->phys_port_cnt) 35 return -EINVAL; 36 if (static_rate != IB_RATE_PORT_CURRENT && 37 ib_rate_to_mbps(static_rate) < 0) 38 return -EINVAL; 39 if ((ah_flags & IB_AH_GRH) && 40 rdma_ah_read_grh(ah_attr)->sgid_index >= port_attr.gid_tbl_len) 41 return -EINVAL; 42 if (rdi->driver_f.check_ah) 43 return rdi->driver_f.check_ah(ibdev, ah_attr); 44 return 0; 45 } 46 EXPORT_SYMBOL(rvt_check_ah); 47 48 /** 49 * rvt_create_ah - create an address handle 50 * @ibah: the IB address handle 51 * @init_attr: the attributes of the AH 52 * @udata: pointer to user's input output buffer information. 53 * 54 * This may be called from interrupt context. 55 * 56 * Return: 0 on success 57 */ 58 int rvt_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr, 59 struct ib_udata *udata) 60 { 61 struct rvt_ah *ah = ibah_to_rvtah(ibah); 62 struct rvt_dev_info *dev = ib_to_rvt(ibah->device); 63 unsigned long flags; 64 65 if (rvt_check_ah(ibah->device, init_attr->ah_attr)) 66 return -EINVAL; 67 68 spin_lock_irqsave(&dev->n_ahs_lock, flags); 69 if (dev->n_ahs_allocated == dev->dparms.props.max_ah) { 70 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 71 return -ENOMEM; 72 } 73 74 dev->n_ahs_allocated++; 75 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 76 77 rdma_copy_ah_attr(&ah->attr, init_attr->ah_attr); 78 79 if (dev->driver_f.notify_new_ah) 80 dev->driver_f.notify_new_ah(ibah->device, 81 init_attr->ah_attr, ah); 82 83 return 0; 84 } 85 86 /** 87 * rvt_destroy_ah - Destroy an address handle 88 * @ibah: address handle 89 * @destroy_flags: destroy address handle flags (see enum rdma_destroy_ah_flags) 90 * Return: 0 on success 91 */ 92 int rvt_destroy_ah(struct ib_ah *ibah, u32 destroy_flags) 93 { 94 struct rvt_dev_info *dev = ib_to_rvt(ibah->device); 95 struct rvt_ah *ah = ibah_to_rvtah(ibah); 96 unsigned long flags; 97 98 spin_lock_irqsave(&dev->n_ahs_lock, flags); 99 dev->n_ahs_allocated--; 100 spin_unlock_irqrestore(&dev->n_ahs_lock, flags); 101 102 rdma_destroy_ah_attr(&ah->attr); 103 return 0; 104 } 105 106 /** 107 * rvt_modify_ah - modify an ah with given attrs 108 * @ibah: address handle to modify 109 * @ah_attr: attrs to apply 110 * 111 * Return: 0 on success 112 */ 113 int rvt_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) 114 { 115 struct rvt_ah *ah = ibah_to_rvtah(ibah); 116 117 if (rvt_check_ah(ibah->device, ah_attr)) 118 return -EINVAL; 119 120 ah->attr = *ah_attr; 121 122 return 0; 123 } 124 125 /** 126 * rvt_query_ah - return attrs for ah 127 * @ibah: address handle to query 128 * @ah_attr: return info in this 129 * 130 * Return: always 0 131 */ 132 int rvt_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr) 133 { 134 struct rvt_ah *ah = ibah_to_rvtah(ibah); 135 136 *ah_attr = ah->attr; 137 138 return 0; 139 } 140