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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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3c81907075
This patch introduces support for allocating and deallocating the DMAH object. Further details: ---------------- The DMAH API is exposed to upper layers only if the underlying device supports TPH. It uses the mlx5_core steering tag (ST) APIs to get a steering tag index based on the provided input. The obtained index is stored in the device-specific mlx5_dmah structure for future use. Upcoming patches in the series will integrate the allocated DMAH into the memory region (MR) registration process. Signed-off-by: Yishai Hadas <yishaih@nvidia.com> Reviewed-by: Edward Srouji <edwards@nvidia.com> Link: https://patch.msgid.link/778550776799d82edb4d05da249a1cff00160b50.1752752567.git.leon@kernel.org Signed-off-by: Leon Romanovsky <leon@kernel.org>
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
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/*
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* Copyright (c) 2025, NVIDIA CORPORATION & AFFILIATES. All rights reserved
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*/
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#include <rdma/uverbs_std_types.h>
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#include <linux/pci-tph.h>
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#include "dmah.h"
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#define UVERBS_MODULE_NAME mlx5_ib
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#include <rdma/uverbs_named_ioctl.h>
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static int mlx5_ib_alloc_dmah(struct ib_dmah *ibdmah,
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struct uverbs_attr_bundle *attrs)
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{
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struct mlx5_core_dev *mdev = to_mdev(ibdmah->device)->mdev;
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struct mlx5_ib_dmah *dmah = to_mdmah(ibdmah);
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u16 st_bits = BIT(IB_DMAH_CPU_ID_EXISTS) |
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BIT(IB_DMAH_MEM_TYPE_EXISTS);
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int err;
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/* PH is a must for TPH following PCIe spec 6.2-1.0 */
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if (!(ibdmah->valid_fields & BIT(IB_DMAH_PH_EXISTS)))
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return -EINVAL;
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/* ST is optional; however, partial data for it is not allowed */
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if (ibdmah->valid_fields & st_bits) {
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if ((ibdmah->valid_fields & st_bits) != st_bits)
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return -EINVAL;
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err = mlx5_st_alloc_index(mdev, ibdmah->mem_type,
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ibdmah->cpu_id, &dmah->st_index);
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if (err)
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return err;
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}
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return 0;
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}
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static int mlx5_ib_dealloc_dmah(struct ib_dmah *ibdmah,
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struct uverbs_attr_bundle *attrs)
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{
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struct mlx5_ib_dmah *dmah = to_mdmah(ibdmah);
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struct mlx5_core_dev *mdev = to_mdev(ibdmah->device)->mdev;
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if (ibdmah->valid_fields & BIT(IB_DMAH_CPU_ID_EXISTS))
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return mlx5_st_dealloc_index(mdev, dmah->st_index);
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return 0;
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}
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const struct ib_device_ops mlx5_ib_dev_dmah_ops = {
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.alloc_dmah = mlx5_ib_alloc_dmah,
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.dealloc_dmah = mlx5_ib_dealloc_dmah,
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};
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