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1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause2/*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 AH12 * @ibdev: the ib device13 * @ah_attr: the attributes of the AH14 *15 * If driver supports a more detailed check_ah function call back to it16 * otherwise just check the basics.17 *18 * Return: 0 on success19 */20int 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}46EXPORT_SYMBOL(rvt_check_ah);47 48/**49 * rvt_create_ah - create an address handle50 * @ibah: the IB address handle51 * @init_attr: the attributes of the AH52 * @udata: pointer to user's input output buffer information.53 *54 * This may be called from interrupt context.55 *56 * Return: 0 on success57 */58int 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 handle88 * @ibah: address handle89 * @destroy_flags: destroy address handle flags (see enum rdma_destroy_ah_flags)90 * Return: 0 on success91 */92int 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 attrs108 * @ibah: address handle to modify109 * @ah_attr: attrs to apply110 *111 * Return: 0 on success112 */113int 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 ah127 * @ibah: address handle to query128 * @ah_attr: return info in this129 *130 * Return: always 0131 */132int 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