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GET /api/patches/914701/?format=api
HTTP 200 OK
Allow: GET, PUT, PATCH, HEAD, OPTIONS
Content-Type: application/json
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{
    "id": 914701,
    "url": "http://patchwork.ozlabs.org/api/patches/914701/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/dc3f47f4-22b2-87d7-3959-9da530efbfe3@trackman.com/",
    "project": {
        "id": 46,
        "url": "http://patchwork.ozlabs.org/api/projects/46/?format=api",
        "name": "Intel Wired Ethernet development",
        "link_name": "intel-wired-lan",
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    "date": "2018-05-16T11:14:11",
    "name": "igb: Clear TSICR interrupts together with ICR",
    "commit_ref": null,
    "pull_url": null,
    "state": "accepted",
    "archived": false,
    "hash": "f3df184fa3eaaa3bf830176712342d900bbdeeaa",
    "submitter": {
        "id": 74088,
        "url": "http://patchwork.ozlabs.org/api/people/74088/?format=api",
        "name": "Joanna Yurdal",
        "email": "jyu@trackman.com"
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        "username": "jtkirshe",
        "first_name": "Jeff",
        "last_name": "Kirsher",
        "email": "jeffrey.t.kirsher@intel.com"
    },
    "mbox": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/dc3f47f4-22b2-87d7-3959-9da530efbfe3@trackman.com/mbox/",
    "series": [
        {
            "id": 44732,
            "url": "http://patchwork.ozlabs.org/api/series/44732/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/list/?series=44732",
            "date": "2018-05-16T11:14:11",
            "name": "igb: Clear TSICR interrupts together with ICR",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/44732/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/914701/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/914701/checks/",
    "tags": {},
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        "Subject": "[Intel-wired-lan] [PATCH] igb: Clear TSICR interrupts together with\n\tICR",
        "X-BeenThere": "intel-wired-lan@osuosl.org",
        "X-Mailman-Version": "2.1.24",
        "Precedence": "list",
        "List-Id": "Intel Wired Ethernet Linux Kernel Driver Development\n\t<intel-wired-lan.osuosl.org>",
        "List-Unsubscribe": "<https://lists.osuosl.org/mailman/options/intel-wired-lan>, \n\t<mailto:intel-wired-lan-request@osuosl.org?subject=unsubscribe>",
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        "Errors-To": "intel-wired-lan-bounces@osuosl.org",
        "Sender": "\"Intel-wired-lan\" <intel-wired-lan-bounces@osuosl.org>"
    },
    "content": "I have been working with the PTP using IGB i210 and the linux driver\ncan end up in a state where it stops receiving E1000_ICR_TS interrupt.\nThe ethernet driver works fine but PPS stops and no tx ptp timestamp\ncan be retrieved. This is caused by not clearing the TS interrupt before enabling igb interrupts in the igb_up function.",
    "diff": "From 8e3eeef09b9960c67917a7f7fafe47751c0932fe Mon Sep 17 00:00:00 2001\nFrom: Joanna Yurdal <jyu@trackman.com>\nDate: Tue, 15 May 2018 12:55:10 +0200\nSubject: [PATCH] igb: Clear TSICR interrupts together with ICR\n\nIssuing \"ip link set up/down\" can block TSICR interrupts, what results in\nmissing PTP tx timestamp and no PPS pulse generation.\n\nProblem happens when the link is set up with the TSICR interrupts pending.\nICR is cleared before enabling interrupts, while TSICR is not. When all TSICR\ninterrupts are pending at this moment, time_sync interrupt will never\nbe generated. TSICR should be cleared as well.\n\nIn order to reproduce the issue:\n1. Setup linux with IEEE 1588 grandmaster and PPS output enabled\n2. Continue setting link up/down with random intervals between commands\n3. Wait until PPS is not generated ( only one pulse is generated and PPS\ndies), and ptp4l complains constantly about tx timeout.\n\nSigned-off-by: Joanna Yurdal <jyu@trackman.com>\n---\n drivers/net/ethernet/intel/igb/igb_main.c | 2 ++\n 1 file changed, 2 insertions(+)\n\ndiff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c\nindex c1c0bc3..5350644 100644\n--- a/drivers/net/ethernet/intel/igb/igb_main.c\n+++ b/drivers/net/ethernet/intel/igb/igb_main.c\n@@ -2063,6 +2063,7 @@ int igb_up(struct igb_adapter *adapter)\n \t\tigb_assign_vector(adapter->q_vector[0], 0);\n \n \t/* Clear any pending interrupts. */\n+\trd32(E1000_TSICR);\n \trd32(E1000_ICR);\n \tigb_irq_enable(adapter);\n \n@@ -3621,6 +3622,7 @@ static int __igb_open(struct net_device *netdev, bool resuming)\n \t\tnapi_enable(&(adapter->q_vector[i]->napi));\n \n \t/* Clear any pending interrupts. */\n+\trd32(E1000_TSICR);\n \trd32(E1000_ICR);\n \n \tigb_irq_enable(adapter);\n-- \n2.7.4\n\n",
    "prefixes": []
}