diff options
Diffstat (limited to 'drivers/infiniband/sw/rdmavt/ah.c')
| -rw-r--r-- | drivers/infiniband/sw/rdmavt/ah.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/infiniband/sw/rdmavt/ah.c b/drivers/infiniband/sw/rdmavt/ah.c new file mode 100644 index 000000000..b938c4ffa --- /dev/null +++ b/drivers/infiniband/sw/rdmavt/ah.c @@ -0,0 +1,182 @@ +/* + * Copyright(c) 2016 - 2019 Intel Corporation. + * + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * BSD LICENSE + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * - Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * - Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * - Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#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_destory_ah - Destory 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; +} |