{"id":2175208,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2175208/?format=json","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/1.0/projects/28/?format=json","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},"msgid":"<20251217151609.3162665-13-den@valinux.co.jp>","date":"2025-12-17T15:15:46","name":"[RFC,v3,12/35] NTB: ntb_transport: Dynamically determine qp count","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"661cb11116ad8936bf25337361edbca364f3cc03","submitter":{"id":91573,"url":"http://patchwork.ozlabs.org/api/1.0/people/91573/?format=json","name":"Koichiro Den","email":"den@valinux.co.jp"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20251217151609.3162665-13-den@valinux.co.jp/mbox/","series":[{"id":485709,"url":"http://patchwork.ozlabs.org/api/1.0/series/485709/?format=json","date":"2025-12-17T15:15:53","name":"NTB transport backed by endpoint DW eDMA","version":3,"mbox":"http://patchwork.ozlabs.org/series/485709/mbox/"}],"check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2175208/checks/","tags":{},"headers":{"Return-Path":"\n ","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 (1024-bit key;\n unprotected) header.d=valinux.co.jp header.i=@valinux.co.jp\n header.a=rsa-sha256 header.s=selector1 header.b=HiOSFIXd;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n 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","To":"Frank.Li@nxp.com,\n\tdave.jiang@intel.com,\n\tntb@lists.linux.dev,\n\tlinux-pci@vger.kernel.org,\n\tdmaengine@vger.kernel.org,\n\tlinux-renesas-soc@vger.kernel.org,\n\tnetdev@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org","Cc":"mani@kernel.org,\n\tkwilczynski@kernel.org,\n\tkishon@kernel.org,\n\tbhelgaas@google.com,\n\tcorbet@lwn.net,\n\tgeert+renesas@glider.be,\n\tmagnus.damm@gmail.com,\n\trobh@kernel.org,\n\tkrzk+dt@kernel.org,\n\tconor+dt@kernel.org,\n\tvkoul@kernel.org,\n\tjoro@8bytes.org,\n\twill@kernel.org,\n\trobin.murphy@arm.com,\n\tjdmason@kudzu.us,\n\tallenbh@gmail.com,\n\tandrew+netdev@lunn.ch,\n\tdavem@davemloft.net,\n\tedumazet@google.com,\n\tkuba@kernel.org,\n\tpabeni@redhat.com,\n\tBasavaraj.Natikar@amd.com,\n\tShyam-sundar.S-k@amd.com,\n\tkurt.schwemmer@microsemi.com,\n\tlogang@deltatee.com,\n\tjingoohan1@gmail.com,\n\tlpieralisi@kernel.org,\n\tutkarsh02t@gmail.com,\n\tjbrunet@baylibre.com,\n\tdlemoal@kernel.org,\n\tarnd@arndb.de,\n\telfring@users.sourceforge.net,\n\tden@valinux.co.jp","Subject":"[RFC PATCH v3 12/35] NTB: ntb_transport: Dynamically determine qp\n count","Date":"Thu, 18 Dec 2025 00:15:46 +0900","Message-ID":"<20251217151609.3162665-13-den@valinux.co.jp>","X-Mailer":"git-send-email 2.51.0","In-Reply-To":"<20251217151609.3162665-1-den@valinux.co.jp>","References":"<20251217151609.3162665-1-den@valinux.co.jp>","Content-Transfer-Encoding":"8bit","Content-Type":"text/plain","X-ClientProxiedBy":"TY4P286CA0060.JPNP286.PROD.OUTLOOK.COM\n (2603:1096:405:371::8) To TYWP286MB2697.JPNP286.PROD.OUTLOOK.COM\n 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176a022d-266f-4e61-7bee-08de3d7f3dae","X-MS-Exchange-CrossTenant-AuthSource":"TYWP286MB2697.JPNP286.PROD.OUTLOOK.COM","X-MS-Exchange-CrossTenant-AuthAs":"Internal","X-MS-Exchange-CrossTenant-OriginalArrivalTime":"17 Dec 2025 15:16:23.8878\n (UTC)","X-MS-Exchange-CrossTenant-FromEntityHeader":"Hosted","X-MS-Exchange-CrossTenant-Id":"7a57bee8-f73d-4c5f-a4f7-d72c91c8c111","X-MS-Exchange-CrossTenant-MailboxType":"HOSTED","X-MS-Exchange-CrossTenant-UserPrincipalName":"\n 5Akg6Oy3McoeNhSUZZPoSh00F2ux/+oXV3ksMUREc35l+A+f6MDiRMaVbA+ASyVPhBojJm4TWu2XSotxuX/x3Q==","X-MS-Exchange-Transport-CrossTenantHeadersStamped":"OS9P286MB4633"},"content":"One MW can host multiple queue pairs, so stop limiting qp_count to the\nnumber of MWs.\n\nNow that both TX and RX MW sizing are done in the same place, the MW\nlayout is derived from a single code path on both host and endpoint, so\nthe layout cannot diverge between the two sides.\n\nSigned-off-by: Koichiro Den \n---\n drivers/ntb/ntb_transport.c | 20 +++++++++++++++++---\n 1 file changed, 17 insertions(+), 3 deletions(-)","diff":"diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c\nindex 42abd1ce02d5..bac842177b55 100644\n--- a/drivers/ntb/ntb_transport.c\n+++ b/drivers/ntb/ntb_transport.c\n@@ -1024,6 +1024,7 @@ static void ntb_transport_link_work(struct work_struct *work)\n \tstruct ntb_dev *ndev = nt->ndev;\n \tstruct pci_dev *pdev = ndev->pdev;\n \tresource_size_t size;\n+\tu64 qp_bitmap_free;\n \tu32 val;\n \tint rc = 0, i, spad;\n \n@@ -1071,8 +1072,23 @@ static void ntb_transport_link_work(struct work_struct *work)\n \n \tval = ntb_spad_read(ndev, NUM_QPS);\n \tdev_dbg(&pdev->dev, \"Remote max number of qps = %d\\n\", val);\n-\tif (val != nt->qp_count)\n+\tif (val == 0)\n \t\tgoto out;\n+\telse if (val < nt->qp_count) {\n+\t\t/*\n+\t\t * Clamp local qp_count to peer-advertised NUM_QPS to avoid\n+\t\t * mismatched queues.\n+\t\t */\n+\t\tqp_bitmap_free = nt->qp_bitmap_free;\n+\t\tfor (i = val; i < nt->qp_count; i++) {\n+\t\t\tnt->qp_bitmap &= ~BIT_ULL(i);\n+\t\t\tnt->qp_bitmap_free &= ~BIT_ULL(i);\n+\t\t}\n+\t\tdev_warn(&pdev->dev,\n+\t\t\t \"Local number of qps is reduced: %d->%d (qp_bitmap_free: 0x%llx->0x%llx)\\n\",\n+\t\t\t nt->qp_count, val, qp_bitmap_free, nt->qp_bitmap_free);\n+\t\tnt->qp_count = val;\n+\t}\n \n \tval = ntb_spad_read(ndev, NUM_MWS);\n \tdev_dbg(&pdev->dev, \"Remote number of mws = %d\\n\", val);\n@@ -1301,8 +1317,6 @@ static int ntb_transport_probe(struct ntb_client *self, struct ntb_dev *ndev)\n \n \tif (max_num_clients && max_num_clients < qp_count)\n \t\tqp_count = max_num_clients;\n-\telse if (nt->mw_count < qp_count)\n-\t\tqp_count = nt->mw_count;\n \n \tqp_bitmap &= BIT_ULL(qp_count) - 1;\n \n","prefixes":["RFC","v3","12/35"]}