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GET /api/1.1/patches/2222625/?format=api
{ "id": 2222625, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2222625/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260413075250.281653-2-wei.fang@nxp.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.1/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/" }, "msgid": "<20260413075250.281653-2-wei.fang@nxp.com>", "date": "2026-04-13T07:52:49", "name": "[net,1/2] net: enetc: correct the command BD ring consumer index", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "ec6ecc0100bb0412d5d6c1687ac8f09d92f3700a", "submitter": { "id": 84380, "url": "http://patchwork.ozlabs.org/api/1.1/people/84380/?format=api", "name": "Wei Fang", "email": "wei.fang@nxp.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260413075250.281653-2-wei.fang@nxp.com/mbox/", "series": [ { "id": 499659, "url": "http://patchwork.ozlabs.org/api/1.1/series/499659/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=499659", "date": "2026-04-13T07:52:48", "name": "net: enetc: fix command BD ring issues", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499659/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2222625/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2222625/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19667-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": 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c=relaxed/relaxed; d=nxp.com; s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=5fmphqKwb0TwqBXKtyWbZh8v9y5oBNjn1xeHgIQJZ7k=;\n b=YNGCaWcnHz809fqWWa0sv+VSOEo3+iGrAZduHecJ7HQehAZHjbUY7aBfwiOWceIVD4nHDdB69B2k+nUx2WjH6ktxxbbtd5KRWnW2RVSYDOQAU/zc3HN3let0EIVpFGu/CStc/AwbEzC4Q8BwPQR5131sZOSFw3cvQxaByKmIG2bQqaibtigC8FK0hph7MQ1iEtldKmrPyVjf0WJNxpJ7bZqeUWiNUrGjkTXDCHPxLlNg/34uCTUOzhcuNTxIJd0RitEHV5TrOWJI7aptQQqDlhttp3DF/oi3TniPyLU5NvkkLVdvjys8uai/UilYCv7nG7yFGSva4ESb6++KZNZ1Cw==", "From": "Wei Fang <wei.fang@nxp.com>", "To": "claudiu.manoil@nxp.com,\n\tvladimir.oltean@nxp.com,\n\txiaoning.wang@nxp.com,\n\tandrew+netdev@lunn.ch,\n\tdavem@davemloft.net,\n\tedumazet@google.com,\n\tkuba@kernel.org,\n\tpabeni@redhat.com,\n\tchleroy@kernel.org", "Cc": "netdev@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\timx@lists.linux.dev,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tlinux-arm-kernel@lists.infradead.org", "Subject": "[PATCH net 1/2] net: enetc: correct the command BD ring consumer\n index", "Date": "Mon, 13 Apr 2026 15:52:49 +0800", "Message-Id": "<20260413075250.281653-2-wei.fang@nxp.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<20260413075250.281653-1-wei.fang@nxp.com>", "References": "<20260413075250.281653-1-wei.fang@nxp.com>", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-ClientProxiedBy": "MA5P287CA0236.INDP287.PROD.OUTLOOK.COM\n (2603:1096:a01:1b1::10) To AM8PR04MB7284.eurprd04.prod.outlook.com\n (2603:10a6:20b:1dc::8)", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n 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(2024-03-25) on lists.ozlabs.org" }, "content": "The command BD ring cousumer index register has the consumer index as\nthe lower 10 bits, and the bit 31 is SBE, which indicates whether a\nsystem bus error occurred during execution of the CBD command. So if a\nsystem bus error occurs, reading the register will get the SBE bit set.\n\nHowever, the current implementation directly uses the register value as\nthe consumer index without masking it. Therefore, if a system bus error\noccurs, an incorrect consumer index will be obtained, causing errors in\nthe processing of the command BD ring. Thus, we need to mask out the\nother bits to obtain the correct consumer index.\n\nFixes: 4701073c3deb (\"net: enetc: add initial netc-lib driver to support NTMP\")\nSigned-off-by: Wei Fang <wei.fang@nxp.com>\n---\n drivers/net/ethernet/freescale/enetc/ntmp.c | 7 ++++---\n drivers/net/ethernet/freescale/enetc/ntmp_private.h | 1 +\n 2 files changed, 5 insertions(+), 3 deletions(-)", "diff": "diff --git a/drivers/net/ethernet/freescale/enetc/ntmp.c b/drivers/net/ethernet/freescale/enetc/ntmp.c\nindex 0c1d343253bf..1b1ff0446d0a 100644\n--- a/drivers/net/ethernet/freescale/enetc/ntmp.c\n+++ b/drivers/net/ethernet/freescale/enetc/ntmp.c\n@@ -55,7 +55,7 @@ int ntmp_init_cbdr(struct netc_cbdr *cbdr, struct device *dev,\n \tspin_lock_init(&cbdr->ring_lock);\n \n \tcbdr->next_to_use = netc_read(cbdr->regs.pir);\n-\tcbdr->next_to_clean = netc_read(cbdr->regs.cir);\n+\tcbdr->next_to_clean = netc_read(cbdr->regs.cir) & NETC_CBDRCIR_INDEX;\n \n \t/* Step 1: Configure the base address of the Control BD Ring */\n \tnetc_write(cbdr->regs.bar0, lower_32_bits(cbdr->dma_base_align));\n@@ -98,7 +98,7 @@ static void ntmp_clean_cbdr(struct netc_cbdr *cbdr)\n \tint i;\n \n \ti = cbdr->next_to_clean;\n-\twhile (netc_read(cbdr->regs.cir) != i) {\n+\twhile ((netc_read(cbdr->regs.cir) & NETC_CBDRCIR_INDEX) != i) {\n \t\tcbd = ntmp_get_cbd(cbdr, i);\n \t\tmemset(cbd, 0, sizeof(*cbd));\n \t\ti = (i + 1) % cbdr->bd_num;\n@@ -135,7 +135,8 @@ static int netc_xmit_ntmp_cmd(struct ntmp_user *user, union netc_cbd *cbd)\n \tcbdr->next_to_use = i;\n \tnetc_write(cbdr->regs.pir, i);\n \n-\terr = read_poll_timeout_atomic(netc_read, val, val == i,\n+\terr = read_poll_timeout_atomic(netc_read, val,\n+\t\t\t\t (val & NETC_CBDRCIR_INDEX) == i,\n \t\t\t\t NETC_CBDR_DELAY_US, NETC_CBDR_TIMEOUT,\n \t\t\t\t true, cbdr->regs.cir);\n \tif (unlikely(err))\ndiff --git a/drivers/net/ethernet/freescale/enetc/ntmp_private.h b/drivers/net/ethernet/freescale/enetc/ntmp_private.h\nindex 34394e40fddd..7a53db8740db 100644\n--- a/drivers/net/ethernet/freescale/enetc/ntmp_private.h\n+++ b/drivers/net/ethernet/freescale/enetc/ntmp_private.h\n@@ -12,6 +12,7 @@\n \n #define NTMP_EID_REQ_LEN\t8\n #define NETC_CBDR_BD_NUM\t256\n+#define NETC_CBDRCIR_INDEX\tGENMASK(9, 0)\n \n union netc_cbd {\n \tstruct {\n", "prefixes": [ "net", "1/2" ] }