194 lines
5.4 KiB
C
194 lines
5.4 KiB
C
/*
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* Copyright(c) 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/slab.h>
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#include "ah.h"
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#include "vt.h" /* for prints */
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/**
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* rvt_check_ah - validate the attributes of AH
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* @ibdev: the ib device
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* @ah_attr: the attributes of the AH
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*
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* If driver supports a more detailed check_ah function call back to it
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* otherwise just check the basics.
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*
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* Return: 0 on success
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*/
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int rvt_check_ah(struct ib_device *ibdev,
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struct rdma_ah_attr *ah_attr)
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{
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int err;
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int port_num = rdma_ah_get_port_num(ah_attr);
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struct ib_port_attr port_attr;
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struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
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u8 ah_flags = rdma_ah_get_ah_flags(ah_attr);
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u8 static_rate = rdma_ah_get_static_rate(ah_attr);
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err = ib_query_port(ibdev, port_num, &port_attr);
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if (err)
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return -EINVAL;
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if (port_num < 1 ||
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port_num > ibdev->phys_port_cnt)
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return -EINVAL;
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if (static_rate != IB_RATE_PORT_CURRENT &&
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ib_rate_to_mbps(static_rate) < 0)
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return -EINVAL;
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if ((ah_flags & IB_AH_GRH) &&
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rdma_ah_read_grh(ah_attr)->sgid_index >= port_attr.gid_tbl_len)
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return -EINVAL;
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if (rdi->driver_f.check_ah)
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return rdi->driver_f.check_ah(ibdev, ah_attr);
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return 0;
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}
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EXPORT_SYMBOL(rvt_check_ah);
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/**
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* rvt_create_ah - create an address handle
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* @pd: the protection domain
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* @ah_attr: the attributes of the AH
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* @udata: pointer to user's input output buffer information.
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*
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* This may be called from interrupt context.
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*
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* Return: newly allocated ah
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*/
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struct ib_ah *rvt_create_ah(struct ib_pd *pd,
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struct rdma_ah_attr *ah_attr,
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struct ib_udata *udata)
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{
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struct rvt_ah *ah;
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struct rvt_dev_info *dev = ib_to_rvt(pd->device);
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unsigned long flags;
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if (rvt_check_ah(pd->device, ah_attr))
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return ERR_PTR(-EINVAL);
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ah = kmalloc(sizeof(*ah), GFP_ATOMIC);
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if (!ah)
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return ERR_PTR(-ENOMEM);
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spin_lock_irqsave(&dev->n_ahs_lock, flags);
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if (dev->n_ahs_allocated == dev->dparms.props.max_ah) {
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spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
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kfree(ah);
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return ERR_PTR(-ENOMEM);
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}
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dev->n_ahs_allocated++;
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spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
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rdma_copy_ah_attr(&ah->attr, ah_attr);
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atomic_set(&ah->refcount, 0);
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if (dev->driver_f.notify_new_ah)
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dev->driver_f.notify_new_ah(pd->device, ah_attr, ah);
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return &ah->ibah;
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}
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/**
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* rvt_destory_ah - Destory an address handle
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* @ibah: address handle
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*
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* Return: 0 on success
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*/
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int rvt_destroy_ah(struct ib_ah *ibah)
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{
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struct rvt_dev_info *dev = ib_to_rvt(ibah->device);
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struct rvt_ah *ah = ibah_to_rvtah(ibah);
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unsigned long flags;
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if (atomic_read(&ah->refcount) != 0)
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return -EBUSY;
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spin_lock_irqsave(&dev->n_ahs_lock, flags);
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dev->n_ahs_allocated--;
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spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
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rdma_destroy_ah_attr(&ah->attr);
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kfree(ah);
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return 0;
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}
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/**
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* rvt_modify_ah - modify an ah with given attrs
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* @ibah: address handle to modify
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* @ah_attr: attrs to apply
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*
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* Return: 0 on success
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*/
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int rvt_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
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{
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struct rvt_ah *ah = ibah_to_rvtah(ibah);
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if (rvt_check_ah(ibah->device, ah_attr))
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return -EINVAL;
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ah->attr = *ah_attr;
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return 0;
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}
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/**
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* rvt_query_ah - return attrs for ah
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* @ibah: address handle to query
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* @ah_attr: return info in this
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*
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* Return: always 0
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*/
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int rvt_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
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{
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struct rvt_ah *ah = ibah_to_rvtah(ibah);
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*ah_attr = ah->attr;
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return 0;
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}
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