LXR linux/drivers/infiniband/sw/rdmavt/ah.c

   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 */
  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 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 */
  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 handle
  88 * @ibah: address handle
  89 * @destroy_flags: destroy address handle flags (see enum rdma_destroy_ah_flags)
  90 * Return: 0 on success
  91 */
  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 attrs
 108 * @ibah: address handle to modify
 109 * @ah_attr: attrs to apply
 110 *
 111 * Return: 0 on success
 112 */
 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 ah
 127 * @ibah: address handle to query
 128 * @ah_attr: return info in this
 129 *
 130 * Return: always 0
 131 */
 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