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Wed, 17 Jun 2026 07:27:14 -0700 From: Maayan Kashani To: CC: , , Viacheslav Ovsiienko , Dariusz Sosnowski , "Bing Zhao" , Ori Kam , Suanming Mou , Matan Azrad Subject: [PATCH v2] drivers: update relaxed ordering policy for mlx5 mkeys Date: Wed, 17 Jun 2026 17:27:08 +0300 Message-ID: <20260617142709.87761-1-mkashani@nvidia.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20260616122355.39114-1-mkashani@nvidia.com> References: <20260616122355.39114-1-mkashani@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003AEB:EE_|SN7PR12MB7129:EE_ X-MS-Office365-Filtering-Correlation-Id: 7cae6fd4-2ed0-4f22-2154-08decc7c968f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|36860700016|82310400026|23010399003|1800799024|376014|11063799006|56012099006|6133799003|22082099003|18002099003; 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Query the new caps and apply them when creating DevX mkeys via mlx5_devx_mkey_attr_set_ordering(), which sets PCI relaxed ordering and RAW=RO when relaxed order is supported. Use this helper on Windows (still gated by Haswell/Broadwell) and for Linux wrapped mkeys and crypto/regex/vdpa indirect mkeys when relaxed order only flag is set. Linux wrapped mkeys continue to use the legacy Haswell/Broadwell rule for IBV_ACCESS_RELAXED_ORDERING on the verbs MR. Upcoming FW will requires setting the correct ordering attributes, otherwise it fails to create the memory key. Signed-off-by: Maayan Kashani Acked-by: Viacheslav Ovsiienko --- drivers/common/mlx5/linux/mlx5_common_os.c | 8 +++++ drivers/common/mlx5/mlx5_devx_cmds.c | 31 ++++++++++++++++++++ drivers/common/mlx5/mlx5_devx_cmds.h | 9 ++++++ drivers/common/mlx5/mlx5_prm.h | 18 ++++++++++-- drivers/common/mlx5/windows/mlx5_common_os.c | 8 ++--- drivers/crypto/mlx5/mlx5_crypto.c | 4 +++ drivers/regex/mlx5/mlx5_regex_fastpath.c | 5 ++++ drivers/regex/mlx5/mlx5_rxp.c | 4 +++ drivers/vdpa/mlx5/mlx5_vdpa_mem.c | 4 +++ 9 files changed, 83 insertions(+), 8 deletions(-) diff --git a/drivers/common/mlx5/linux/mlx5_common_os.c b/drivers/common/mlx5/linux/mlx5_common_os.c index e3db6c41245..36b7874ce77 100644 --- a/drivers/common/mlx5/linux/mlx5_common_os.c +++ b/drivers/common/mlx5/linux/mlx5_common_os.c @@ -997,6 +997,7 @@ int mlx5_os_wrapped_mkey_create(void *ctx, void *pd, uint32_t pdn, void *addr, size_t length, struct mlx5_pmd_wrapped_mr *pmd_mr) { + struct mlx5_hca_attr hca_attr = { 0 }; struct mlx5_klm klm = { .byte_count = length, .address = (uintptr_t)addr, @@ -1019,6 +1020,13 @@ mlx5_os_wrapped_mkey_create(void *ctx, void *pd, uint32_t pdn, void *addr, klm.mkey = ibv_mr->lkey; mkey_attr.addr = (uintptr_t)addr; mkey_attr.size = length; + if (mlx5_devx_cmd_query_hca_attr(ctx, &hca_attr)) { + claim_zero(mlx5_glue->dereg_mr(ibv_mr)); + return -1; + } + /* If only relaxed order is allowed. */ + if (hca_attr.mkc_order_write_after_write_ro_only) + mlx5_devx_mkey_attr_set_ordering(&mkey_attr, &hca_attr); mkey = mlx5_devx_cmd_mkey_create(ctx, &mkey_attr); if (!mkey) { claim_zero(mlx5_glue->dereg_mr(ibv_mr)); diff --git a/drivers/common/mlx5/mlx5_devx_cmds.c b/drivers/common/mlx5/mlx5_devx_cmds.c index c4ac2aaceed..140b057ab47 100644 --- a/drivers/common/mlx5/mlx5_devx_cmds.c +++ b/drivers/common/mlx5/mlx5_devx_cmds.c @@ -331,6 +331,29 @@ mlx5_devx_cmd_flow_counter_query(struct mlx5_devx_obj *dcs, return 0; } +/** + * Apply PCI relaxed-ordering and read-after-write ordering to mkey attributes. + * + * @param[in, out] mkey_attr + * Mkey attributes to update. + * @param[in] hca_attr + * HCA capabilities from mlx5_devx_cmd_query_hca_attr(). + */ +RTE_EXPORT_INTERNAL_SYMBOL(mlx5_devx_mkey_attr_set_ordering) +void +mlx5_devx_mkey_attr_set_ordering(struct mlx5_devx_mkey_attr *mkey_attr, + const struct mlx5_hca_attr *hca_attr) +{ + if (!mkey_attr || !hca_attr) + return; + + mkey_attr->relaxed_ordering_write = hca_attr->relaxed_ordering_write; + mkey_attr->relaxed_ordering_read = + hca_attr->relaxed_ordering_read || hca_attr->pci_relaxed_ordered_read; + if (hca_attr->mkc_order_read_after_write) + mkey_attr->read_after_write_ordering = MLX5_MKC_RAW_ORDERING_RO; +} + /** * Create a new mkey. * @@ -417,6 +440,8 @@ mlx5_devx_cmd_mkey_create(void *ctx, MLX5_SET(mkc, mkc, relaxed_ordering_write, attr->relaxed_ordering_write); MLX5_SET(mkc, mkc, relaxed_ordering_read, attr->relaxed_ordering_read); + MLX5_SET(mkc, mkc, order_read_after_write, + attr->read_after_write_ordering); MLX5_SET64(mkc, mkc, start_addr, attr->addr); MLX5_SET64(mkc, mkc, len, attr->size); MLX5_SET(mkc, mkc, crypto_en, attr->crypto_en); @@ -1003,6 +1028,12 @@ mlx5_devx_cmd_query_hca_attr(void *ctx, relaxed_ordering_write); attr->relaxed_ordering_read = MLX5_GET(cmd_hca_cap, hcattr, relaxed_ordering_read); + attr->pci_relaxed_ordered_read = MLX5_GET(cmd_hca_cap, hcattr, + pci_relaxed_ordered_read); + attr->mkc_order_read_after_write = MLX5_GET(cmd_hca_cap, hcattr, + mkc_order_read_after_write); + attr->mkc_order_write_after_write_ro_only = MLX5_GET(cmd_hca_cap, hcattr, + mkc_order_write_after_write_ro_only); attr->access_register_user = MLX5_GET(cmd_hca_cap, hcattr, access_register_user); attr->eth_net_offloads = MLX5_GET(cmd_hca_cap, hcattr, diff --git a/drivers/common/mlx5/mlx5_devx_cmds.h b/drivers/common/mlx5/mlx5_devx_cmds.h index 82d949972bb..90beb2e9e6c 100644 --- a/drivers/common/mlx5/mlx5_devx_cmds.h +++ b/drivers/common/mlx5/mlx5_devx_cmds.h @@ -34,6 +34,7 @@ struct mlx5_devx_mkey_attr { uint32_t pg_access:1; uint32_t relaxed_ordering_write:1; uint32_t relaxed_ordering_read:1; + uint32_t read_after_write_ordering:2; uint32_t umr_en:1; uint32_t crypto_en:2; uint32_t set_remote_rw:1; @@ -237,6 +238,9 @@ struct mlx5_hca_attr { uint32_t vhca_id:16; uint32_t relaxed_ordering_write:1; uint32_t relaxed_ordering_read:1; + uint32_t pci_relaxed_ordered_read:1; + uint32_t mkc_order_read_after_write:1; + uint32_t mkc_order_write_after_write_ro_only:1; uint32_t access_register_user:1; uint32_t wqe_index_ignore:1; uint32_t cross_channel:1; @@ -748,6 +752,11 @@ int mlx5_devx_cmd_query_hca_attr(void *ctx, __rte_internal struct mlx5_devx_obj *mlx5_devx_cmd_mkey_create(void *ctx, struct mlx5_devx_mkey_attr *attr); + +__rte_internal +void +mlx5_devx_mkey_attr_set_ordering(struct mlx5_devx_mkey_attr *mkey_attr, + const struct mlx5_hca_attr *hca_attr); __rte_internal int mlx5_devx_get_out_command_status(void *out); __rte_internal diff --git a/drivers/common/mlx5/mlx5_prm.h b/drivers/common/mlx5/mlx5_prm.h index 3bb072a7fec..c2810194f8e 100644 --- a/drivers/common/mlx5/mlx5_prm.h +++ b/drivers/common/mlx5/mlx5_prm.h @@ -1463,7 +1463,9 @@ struct mlx5_ifc_mkc_bits { u8 bsf_octword_size[0x20]; u8 reserved_at_120[0x80]; u8 translations_octword_size[0x20]; - u8 reserved_at_1c0[0x19]; + u8 reserved_at_1c0[0x16]; + u8 order_read_after_write[0x2]; + u8 reserved_at_1d8[0x1]; u8 relaxed_ordering_read[0x1]; u8 reserved_at_1da[0x1]; u8 log_page_size[0x5]; @@ -1478,6 +1480,13 @@ enum { MLX5_MKEY_CRYPTO_ENABLED = 0x1, }; +/* MKC read_after_write_ordering field (2-bit, dword 0x38 bits 9:8). */ +enum mlx5_mkc_raw_ordering { + MLX5_MKC_RAW_ORDERING_SO = 0x0, + MLX5_MKC_RAW_ORDERING_SAO = 0x1, + MLX5_MKC_RAW_ORDERING_RO = 0x2, +}; + struct mlx5_ifc_create_mkey_out_bits { u8 status[0x8]; u8 reserved_at_8[0x18]; @@ -1827,7 +1836,8 @@ struct mlx5_ifc_cmd_hca_cap_bits { u8 log_max_mcg[0x8]; u8 reserved_at_320[0x3]; u8 log_max_transport_domain[0x5]; - u8 reserved_at_328[0x3]; + u8 reserved_at_328[0x2]; + u8 pci_relaxed_ordered_read[0x1]; u8 log_max_pd[0x5]; u8 reserved_at_330[0xb]; u8 log_max_xrcd[0x5]; @@ -1860,7 +1870,9 @@ struct mlx5_ifc_cmd_hca_cap_bits { u8 ext_stride_num_range[0x1]; u8 reserved_at_3a1[0x2]; u8 log_max_stride_sz_rq[0x5]; - u8 reserved_at_3a8[0x3]; + u8 mkc_order_read_after_write[0x1]; + u8 mkc_order_write_after_write_ro_only[0x1]; + u8 reserved_at_3aa[0x1]; u8 log_min_stride_sz_rq[0x5]; u8 reserved_at_3b0[0x3]; u8 log_max_stride_sz_sq[0x5]; diff --git a/drivers/common/mlx5/windows/mlx5_common_os.c b/drivers/common/mlx5/windows/mlx5_common_os.c index c790c9a4aeb..bdafb95df98 100644 --- a/drivers/common/mlx5/windows/mlx5_common_os.c +++ b/drivers/common/mlx5/windows/mlx5_common_os.c @@ -384,7 +384,7 @@ mlx5_os_reg_mr(void *pd, { struct mlx5_devx_mkey_attr mkey_attr; struct mlx5_pd *mlx5_pd = (struct mlx5_pd *)pd; - struct mlx5_hca_attr attr; + struct mlx5_hca_attr attr = { 0 }; struct mlx5_devx_obj *mkey; void *obj; @@ -403,10 +403,8 @@ mlx5_os_reg_mr(void *pd, mkey_attr.size = length; mkey_attr.umem_id = ((struct mlx5_devx_umem *)(obj))->umem_id; mkey_attr.pd = mlx5_pd->pdn; - if (!mlx5_haswell_broadwell_cpu) { - mkey_attr.relaxed_ordering_write = attr.relaxed_ordering_write; - mkey_attr.relaxed_ordering_read = attr.relaxed_ordering_read; - } + if (!mlx5_haswell_broadwell_cpu) + mlx5_devx_mkey_attr_set_ordering(&mkey_attr, &attr); mkey = mlx5_devx_cmd_mkey_create(mlx5_pd->devx_ctx, &mkey_attr); if (!mkey) { claim_zero(mlx5_os_umem_dereg(obj)); diff --git a/drivers/crypto/mlx5/mlx5_crypto.c b/drivers/crypto/mlx5/mlx5_crypto.c index dd0aabb6d75..448dd0c5a4e 100644 --- a/drivers/crypto/mlx5/mlx5_crypto.c +++ b/drivers/crypto/mlx5/mlx5_crypto.c @@ -97,7 +97,11 @@ mlx5_crypto_indirect_mkeys_prepare(struct mlx5_crypto_priv *priv, mlx5_crypto_mkey_update_t update_cb) { uint32_t i; + struct mlx5_hca_attr *hca_attr = &priv->cdev->config.hca_attr; + /* If only relaxed order is allowed. */ + if (hca_attr->mkc_order_write_after_write_ro_only) + mlx5_devx_mkey_attr_set_ordering(attr, hca_attr); for (i = 0; i < qp->entries_n; i++) { attr->klm_array = update_cb(priv, qp, i); qp->mkey[i] = mlx5_devx_cmd_mkey_create(priv->cdev->ctx, attr); diff --git a/drivers/regex/mlx5/mlx5_regex_fastpath.c b/drivers/regex/mlx5/mlx5_regex_fastpath.c index 3207bcbc603..55f7411593a 100644 --- a/drivers/regex/mlx5/mlx5_regex_fastpath.c +++ b/drivers/regex/mlx5/mlx5_regex_fastpath.c @@ -755,9 +755,14 @@ mlx5_regexdev_setup_fastpath(struct mlx5_regex_priv *priv, uint32_t qp_id) setup_qps(priv, qp); if (priv->has_umr) { + struct mlx5_hca_attr *hca_attr = &priv->cdev->config.hca_attr; + #ifdef HAVE_IBV_FLOW_DV_SUPPORT attr.pd = priv->cdev->pdn; #endif + /* If only relaxed order is allowed. */ + if (hca_attr->mkc_order_write_after_write_ro_only) + mlx5_devx_mkey_attr_set_ordering(&attr, hca_attr); for (i = 0; i < qp->nb_desc; i++) { attr.klm_num = MLX5_REGEX_MAX_KLM_NUM; attr.klm_array = qp->jobs[i].imkey_array; diff --git a/drivers/regex/mlx5/mlx5_rxp.c b/drivers/regex/mlx5/mlx5_rxp.c index dda4a7fdb0b..b865c08b53c 100644 --- a/drivers/regex/mlx5/mlx5_rxp.c +++ b/drivers/regex/mlx5/mlx5_rxp.c @@ -54,6 +54,7 @@ rxp_create_mkey(struct mlx5_regex_priv *priv, void *ptr, size_t size, uint32_t access, struct mlx5_regex_mkey *mkey) { struct mlx5_devx_mkey_attr mkey_attr; + struct mlx5_hca_attr *hca_attr = &priv->cdev->config.hca_attr; /* Register the memory. */ mkey->umem = mlx5_glue->devx_umem_reg(priv->cdev->ctx, ptr, size, access); @@ -72,6 +73,9 @@ rxp_create_mkey(struct mlx5_regex_priv *priv, void *ptr, size_t size, #ifdef HAVE_IBV_FLOW_DV_SUPPORT mkey_attr.pd = priv->cdev->pdn; #endif + /* If only relaxed order is allowed. */ + if (hca_attr->mkc_order_write_after_write_ro_only) + mlx5_devx_mkey_attr_set_ordering(&mkey_attr, hca_attr); mkey->mkey = mlx5_devx_cmd_mkey_create(priv->cdev->ctx, &mkey_attr); if (!mkey->mkey) { DRV_LOG(ERR, "Failed to create direct mkey!"); diff --git a/drivers/vdpa/mlx5/mlx5_vdpa_mem.c b/drivers/vdpa/mlx5/mlx5_vdpa_mem.c index 4dfe800b8fc..8c9d169d2a8 100644 --- a/drivers/vdpa/mlx5/mlx5_vdpa_mem.c +++ b/drivers/vdpa/mlx5/mlx5_vdpa_mem.c @@ -179,6 +179,7 @@ static int mlx5_vdpa_create_indirect_mkey(struct mlx5_vdpa_priv *priv) { struct mlx5_devx_mkey_attr mkey_attr; + struct mlx5_hca_attr *hca_attr = &priv->cdev->config.hca_attr; struct mlx5_vdpa_query_mr *mrs = (struct mlx5_vdpa_query_mr *)priv->mrs; struct mlx5_vdpa_query_mr *entry; @@ -242,6 +243,9 @@ mlx5_vdpa_create_indirect_mkey(struct mlx5_vdpa_priv *priv) mkey_attr.pg_access = 0; mkey_attr.klm_array = klm_array; mkey_attr.klm_num = klm_index; + /* If only relaxed order is allowed. */ + if (hca_attr->mkc_order_write_after_write_ro_only) + mlx5_devx_mkey_attr_set_ordering(&mkey_attr, hca_attr); entry = &mrs[mem->nregions]; entry->mkey = mlx5_devx_cmd_mkey_create(priv->cdev->ctx, &mkey_attr); if (!entry->mkey) { -- 2.21.0