// 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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(vorverarbeitet am 2026-09-28)
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