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// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
/*
* Copyright(c) 2016 - 2019 Intel Corporation.
*/
#include <linux/slab.h>
#include "ah.h"
#include "vt.h" /* for prints */
/**
* rvt_check_ah - validate the attributes of AH
* @ibdev: the ib device
* @ah_attr: the attributes of the AH
*
* If driver supports a more detailed check_ah function call back to it
* otherwise just check the basics.
*
* Return: 0 on success
*/
int rvt_check_ah(struct ib_device *ibdev,
struct rdma_ah_attr *ah_attr)
{
int err;
int port_num = rdma_ah_get_port_num(ah_attr);
struct ib_port_attr port_attr;
struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
u8 ah_flags = rdma_ah_get_ah_flags(ah_attr);
u8 static_rate = rdma_ah_get_static_rate(ah_attr);
err = ib_query_port(ibdev, port_num, &port_attr);
if (err)
return -EINVAL;
if (port_num < 1 ||
port_num > ibdev->phys_port_cnt)
return -EINVAL;
if (static_rate != IB_RATE_PORT_CURRENT &&
ib_rate_to_mbps(static_rate) < 0)
return -EINVAL;
if ((ah_flags & IB_AH_GRH) &&
rdma_ah_read_grh(ah_attr)->sgid_index >= port_attr.gid_tbl_len)
return -EINVAL;
if (rdi->driver_f.check_ah)
return rdi->driver_f.check_ah(ibdev, ah_attr);
return 0;
}
EXPORT_SYMBOL(rvt_check_ah);
/**
* rvt_create_ah - create an address handle
* @ibah: the IB address handle
* @init_attr: the attributes of the AH
* @udata: pointer to user's input output buffer information.
*
* This may be called from interrupt context.
*
* Return: 0 on success
*/
int rvt_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *init_attr,
struct ib_udata *udata)
{
struct rvt_ah *ah = ibah_to_rvtah(ibah);
struct rvt_dev_info *dev = ib_to_rvt(ibah->device);
unsigned long flags;
if (rvt_check_ah(ibah->device, init_attr->ah_attr))
return -EINVAL;
spin_lock_irqsave(&dev->n_ahs_lock, flags);
if (dev->n_ahs_allocated == dev->dparms.props.max_ah) {
spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
return -ENOMEM;
}
dev->n_ahs_allocated++;
spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
rdma_copy_ah_attr(&ah->attr, init_attr->ah_attr);
if (dev->driver_f.notify_new_ah)
dev->driver_f.notify_new_ah(ibah->device,
init_attr->ah_attr, ah);
return 0;
}
/**
* rvt_destroy_ah - Destroy an address handle
* @ibah: address handle
* @destroy_flags: destroy address handle flags (see enum rdma_destroy_ah_flags)
* Return: 0 on success
*/
int rvt_destroy_ah(struct ib_ah *ibah, u32 destroy_flags)
{
struct rvt_dev_info *dev = ib_to_rvt(ibah->device);
struct rvt_ah *ah = ibah_to_rvtah(ibah);
unsigned long flags;
spin_lock_irqsave(&dev->n_ahs_lock, flags);
dev->n_ahs_allocated--;
spin_unlock_irqrestore(&dev->n_ahs_lock, flags);
rdma_destroy_ah_attr(&ah->attr);
return 0;
}
/**
* rvt_modify_ah - modify an ah with given attrs
* @ibah: address handle to modify
* @ah_attr: attrs to apply
*
* Return: 0 on success
*/
int rvt_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
{
struct rvt_ah *ah = ibah_to_rvtah(ibah);
if (rvt_check_ah(ibah->device, ah_attr))
return -EINVAL;
ah->attr = *ah_attr;
return 0;
}
/**
* rvt_query_ah - return attrs for ah
* @ibah: address handle to query
* @ah_attr: return info in this
*
* Return: always 0
*/
int rvt_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *ah_attr)
{
struct rvt_ah *ah = ibah_to_rvtah(ibah);
*ah_attr = ah->attr;
return 0;
}
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