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GET /api/patches/2215642/?format=api
{ "id": 2215642, "url": "http://patchwork.ozlabs.org/api/patches/2215642/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260324234615.3731237-3-zhipingz@meta.com/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api", "name": "Linux PCI development", "link_name": "linux-pci", "list_id": "linux-pci.vger.kernel.org", "list_email": "linux-pci@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260324234615.3731237-3-zhipingz@meta.com>", "list_archive_url": null, "date": "2026-03-24T23:46:03", "name": "[RFC,v2,2/2] RDMA/mlx5: get tph for p2p access when registering dmabuf mr", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "726011b4401fce137e10af0487fc4243a26b1e4f", "submitter": { "id": 92088, "url": "http://patchwork.ozlabs.org/api/people/92088/?format=api", "name": "Zhiping Zhang", "email": "zhipingz@meta.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260324234615.3731237-3-zhipingz@meta.com/mbox/", "series": [ { "id": 497360, "url": "http://patchwork.ozlabs.org/api/series/497360/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=497360", "date": "2026-03-24T23:46:02", "name": "Retrieve tph from dmabuf for PCIe P2P memory access", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/497360/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2215642/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2215642/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-50997-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pci@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=meta.com header.i=@meta.com header.a=rsa-sha256\n header.s=s2048-2025-q2 header.b=VDQr8Afa;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; 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Tue, 24 Mar 2026 23:51:51 +0000", "by devbig259.ftw1.facebook.com (Postfix, from userid 664516)\n\tid 496D01D7CF69; Tue, 24 Mar 2026 16:46:28 -0700 (PDT)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1774396315; cv=none;\n b=CyUSi1sYaqIcnLrsfExGfUUF5NDoKiOkJelZmMVSwry98pOx0OSYdZRaaONWfwE8tVDt/nRb6l+vt7+4mahIFIsvIKgIpHY0KstLSK0JFM6kQD4Gir7pqFlFAGIFoGJsQecCx0vxFOr6MXbLHmy/3pZXlsfGTteiTOx/rA4xAKg=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1774396315; c=relaxed/simple;\n\tbh=bTY2kSZ8d0y76wdgYY4Ktc2YHV+f+ThnXpVEOY1Mkzs=;\n\th=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version:Content-Type;\n b=HkWHl9vgIn4H2y9XT64bu0dZU9aNx1DAzYX4bSVg203G4RAzYpVXIRJqO5RDflRFsFCbhIB7p3bLUrVI+WrzzOD6TdIvwLeNxV0bogKNb4J9AH/btVwsSN3NuaZ2Dm1keo+/5s15/x/KaAUQfosO8BnoqTXyYePEQtR80eze4sA=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dmarc=pass (p=reject dis=none) header.from=meta.com;\n spf=pass smtp.mailfrom=meta.com;\n dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com\n header.b=VDQr8Afa; arc=none smtp.client-ip=67.231.145.42", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=meta.com; h=cc\n\t:content-transfer-encoding:content-type:date:from:in-reply-to\n\t:message-id:mime-version:references:subject:to; s=s2048-2025-q2;\n\t bh=oGyXd3xG5pggurnnSOT71i0oSkKn9mw956kLM6mwDgM=; b=VDQr8AfaXbHH\n\tCXynrSWPSPxPAjkD3kcSwIcmegl0Sz5fpHZyNkdUGDfRt33TtKZPFqYk/iqR64IV\n\tZQK5YC27Ayu0nDD5EcbUn+mHXSLEH1+p/S6ebARVBaUwgPLjBuLtgXjnt36l8E0e\n\tcQgtw5nOPLsTZSG+yhfYaQjezIS9/M4TlvJO8QB6XJDLrAe3zF9Vo+9IUgOs/vME\n\ttmmON1rwWrP/CrVdpAuBaJ/0x0IG9SILhL8qGSX3ZRAD5Eg6tMYMuCxToLPaj67z\n\t0PqA41C84edawzAwX63UH961xsYfZ1qpiq6a3GYeJk5CxuXJSEBEZh7ppBgrvfh5\n\tLQeEsTLeVg==", "From": "Zhiping Zhang <zhipingz@meta.com>", "To": "Jason Gunthorpe <jgg@ziepe.ca>, Leon Romanovsky <leon@kernel.org>,\n Bjorn\n Helgaas <bhelgaas@google.com>, <linux-rdma@vger.kernel.org>,\n <linux-pci@vger.kernel.org>, <netdev@vger.kernel.org>,\n <dri-devel@lists.freedesktop.org>, Keith Busch <kbusch@kernel.org>,\n Yochai\n Cohen <yochai@nvidia.com>, Yishai Hadas <yishaih@nvidia.com>", "CC": "Bjorn Helgaas <helgaas@kernel.org>, Zhiping Zhang <zhipingz@meta.com>", "Subject": "[RFC v2 2/2] RDMA/mlx5: get tph for p2p access when registering\n dmabuf mr", "Date": "Tue, 24 Mar 2026 16:46:03 -0700", "Message-ID": "<20260324234615.3731237-3-zhipingz@meta.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<20260324234615.3731237-1-zhipingz@meta.com>", "References": "<20260324234615.3731237-1-zhipingz@meta.com>", "Precedence": "bulk", "X-Mailing-List": "linux-pci@vger.kernel.org", "List-Id": "<linux-pci.vger.kernel.org>", "List-Subscribe": "<mailto:linux-pci+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-pci+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "quoted-printable", "X-FB-Internal": "Safe", "Content-Type": "text/plain", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwMzI0MDE4NCBTYWx0ZWRfX+iuNUXi3QzMR\n 9JSxKEYeeJx0mn4/ugDbMCZWUNX9xpQdO+pIt8WFSHVV6DY5g9mU+RUdouXiwFD6m2MFppD1WTi\n 28+Kkp6Sn9/wWbO/fToNODG9t1J/asC36j/VT4tBJuA/uU7yWw13ddJIntoTgEi70tzz0zTWjFS\n FjiuVmWS00I2jnj5wrNcjxYXO3PidS2I5vwcN8fJi4FyjxA3a7x6n05oZ6WgxY4FozbI9B7c7mt\n y82EXxd7t71pROHobhFD08+arvdY5DQxF0hQ2ZzOR9B/yqjLQ+amFMAnDNTIoIoBB3gmAM98LIw\n a1amlQXXWYSB18nd8AduzgZHen9zJ5TWvT9OmrmoG82YF5uuftCBL4/7dcCLEaVvq9K7cvCTGtz\n 0/6UuP7EyBtCR6ty9gwEHnATUrhUxpGT2JnioJ52d9X21LqdeCvhggobjxFnPjSGvVlgUocbsRI\n WJJ1imQcpoZgJ+3rRWw==", "X-Proofpoint-ORIG-GUID": "S1NlyFhwGSYBptXimtex7jfwu967_PAr", "X-Proofpoint-GUID": "S1NlyFhwGSYBptXimtex7jfwu967_PAr", "X-Authority-Analysis": "v=2.4 cv=KbffcAYD c=1 sm=1 tr=0 ts=69c32399 cx=c_pps\n a=CB4LiSf2rd0gKozIdrpkBw==:117 a=CB4LiSf2rd0gKozIdrpkBw==:17\n a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=7x6HtfJdh03M6CCDgxCd:22\n a=_1IyUuN4QrATX339ibzo:22 a=VabnemYjAAAA:8 a=YIu6cGBJ8C_R0mlkFEgA:9\n a=gKebqoRLp9LExxC7YDUY:22", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-03-24_04,2026-03-24_01,2025-10-01_01" }, "content": "This patch adds support to retrieve tph info from dmabuf during mr\nregistration for P2P memory access. A new helper get_tph_mr_dmabuf()\nqueries the dmabuf exporter for tph (steering tag and processing hint)\nand converts the raw steering tag to an st_index via\nmlx5_st_alloc_index_by_tag(). The DMAH workflow for CPU still takes\nprecedence in the process.\n\nThe new mlx5_st_alloc_index_by_tag() API is extracted from\nmlx5_st_alloc_index() to allow callers that already have a raw steering\ntag value (e.g., from a dmabuf) to allocate an st_index directly,\nwithout requiring a CPU ID and memory type lookup.\n\nSigned-off-by: Zhiping Zhang <zhipingz@meta.com>\n---\n drivers/infiniband/hw/mlx5/mr.c | 34 +++++++++++++++++++\n .../net/ethernet/mellanox/mlx5/core/lib/st.c | 23 +++++++++----\n include/linux/mlx5/driver.h | 7 ++++\n 3 files changed, 57 insertions(+), 7 deletions(-)\n\n--\n2.52.0", "diff": "diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c\nindex 665323b90b64..041922ba3bff 100644\n--- a/drivers/infiniband/hw/mlx5/mr.c\n+++ b/drivers/infiniband/hw/mlx5/mr.c\n@@ -46,6 +46,8 @@\n #include \"data_direct.h\"\n #include \"dmah.h\"\n\n+MODULE_IMPORT_NS(\"DMA_BUF\");\n+\n enum {\n \tMAX_PENDING_REG_MR = 8,\n };\n@@ -1622,6 +1624,36 @@ static struct dma_buf_attach_ops mlx5_ib_dmabuf_attach_ops = {\n \t.move_notify = mlx5_ib_dmabuf_invalidate_cb,\n };\n\n+static void get_tph_mr_dmabuf(struct mlx5_ib_dev *dev, int fd, u16 *st_index,\n+\t\t\t u8 *ph)\n+{\n+\tstruct dma_buf *dmabuf;\n+\tu16 steering_tag;\n+\tint ret;\n+\n+\tdmabuf = dma_buf_get(fd);\n+\tif (IS_ERR(dmabuf))\n+\t\treturn;\n+\n+\tif (!dmabuf->ops->get_tph)\n+\t\tgoto end_dbuf_put;\n+\n+\tret = dmabuf->ops->get_tph(dmabuf, &steering_tag, ph);\n+\tif (ret) {\n+\t\tmlx5_ib_dbg(dev, \"get_tph failed (%d)\\n\", ret);\n+\t\tgoto end_dbuf_put;\n+\t}\n+\n+\tret = mlx5_st_alloc_index_by_tag(dev->mdev, steering_tag, st_index);\n+\tif (ret) {\n+\t\t*ph = MLX5_IB_NO_PH;\n+\t\tmlx5_ib_dbg(dev, \"st_alloc_index_by_tag failed (%d)\\n\", ret);\n+\t}\n+\n+end_dbuf_put:\n+\tdma_buf_put(dmabuf);\n+}\n+\n static struct ib_mr *\n reg_user_mr_dmabuf(struct ib_pd *pd, struct device *dma_device,\n \t\t u64 offset, u64 length, u64 virt_addr,\n@@ -1664,6 +1696,8 @@ reg_user_mr_dmabuf(struct ib_pd *pd, struct device *dma_device,\n \t\tph = dmah->ph;\n \t\tif (dmah->valid_fields & BIT(IB_DMAH_CPU_ID_EXISTS))\n \t\t\tst_index = mdmah->st_index;\n+\t} else {\n+\t\tget_tph_mr_dmabuf(dev, fd, &st_index, &ph);\n \t}\n\n \tmr = alloc_cacheable_mr(pd, &umem_dmabuf->umem, virt_addr,\ndiff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c\nindex 997be91f0a13..112c55ede731 100644\n--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c\n+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/st.c\n@@ -92,23 +92,18 @@ void mlx5_st_destroy(struct mlx5_core_dev *dev)\n \tkfree(st);\n }\n\n-int mlx5_st_alloc_index(struct mlx5_core_dev *dev, enum tph_mem_type mem_type,\n-\t\t\tunsigned int cpu_uid, u16 *st_index)\n+int mlx5_st_alloc_index_by_tag(struct mlx5_core_dev *dev, u16 tag,\n+\t\t\t u16 *st_index)\n {\n \tstruct mlx5_st_idx_data *idx_data;\n \tstruct mlx5_st *st = dev->st;\n \tunsigned long index;\n \tu32 xa_id;\n-\tu16 tag;\n \tint ret;\n\n \tif (!st)\n \t\treturn -EOPNOTSUPP;\n\n-\tret = pcie_tph_get_cpu_st(dev->pdev, mem_type, cpu_uid, &tag);\n-\tif (ret)\n-\t\treturn ret;\n-\n \tif (st->direct_mode) {\n \t\t*st_index = tag;\n \t\treturn 0;\n@@ -152,6 +147,20 @@ int mlx5_st_alloc_index(struct mlx5_core_dev *dev, enum tph_mem_type mem_type,\n \tmutex_unlock(&st->lock);\n \treturn ret;\n }\n+EXPORT_SYMBOL_GPL(mlx5_st_alloc_index_by_tag);\n+\n+int mlx5_st_alloc_index(struct mlx5_core_dev *dev, enum tph_mem_type mem_type,\n+\t\t\tunsigned int cpu_uid, u16 *st_index)\n+{\n+\tu16 tag;\n+\tint ret;\n+\n+\tret = pcie_tph_get_cpu_st(dev->pdev, mem_type, cpu_uid, &tag);\n+\tif (ret)\n+\t\treturn ret;\n+\n+\treturn mlx5_st_alloc_index_by_tag(dev, tag, st_index);\n+}\n EXPORT_SYMBOL_GPL(mlx5_st_alloc_index);\n\n int mlx5_st_dealloc_index(struct mlx5_core_dev *dev, u16 st_index)\ndiff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h\nindex 04dcd09f7517..c1d2d603bd96 100644\n--- a/include/linux/mlx5/driver.h\n+++ b/include/linux/mlx5/driver.h\n@@ -1177,10 +1177,17 @@ int mlx5_dm_sw_icm_dealloc(struct mlx5_core_dev *dev, enum mlx5_sw_icm_type type\n \t\t\t u64 length, u16 uid, phys_addr_t addr, u32 obj_id);\n\n #ifdef CONFIG_PCIE_TPH\n+int mlx5_st_alloc_index_by_tag(struct mlx5_core_dev *dev, u16 tag,\n+\t\t\t u16 *st_index);\n int mlx5_st_alloc_index(struct mlx5_core_dev *dev, enum tph_mem_type mem_type,\n \t\t\tunsigned int cpu_uid, u16 *st_index);\n int mlx5_st_dealloc_index(struct mlx5_core_dev *dev, u16 st_index);\n #else\n+static inline int mlx5_st_alloc_index_by_tag(struct mlx5_core_dev *dev,\n+\t\t\t\t\t u16 tag, u16 *st_index)\n+{\n+\treturn -EOPNOTSUPP;\n+}\n static inline int mlx5_st_alloc_index(struct mlx5_core_dev *dev,\n \t\t\t\t enum tph_mem_type mem_type,\n \t\t\t\t unsigned int cpu_uid, u16 *st_index)\n", "prefixes": [ "RFC", "v2", "2/2" ] }