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GET /api/patches/947895/?format=api
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{
    "id": 947895,
    "url": "http://patchwork.ozlabs.org/api/patches/947895/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20180723173752.19676-7-anirudh.venkataramanan@intel.com/",
    "project": {
        "id": 46,
        "url": "http://patchwork.ozlabs.org/api/projects/46/?format=api",
        "name": "Intel Wired Ethernet development",
        "link_name": "intel-wired-lan",
        "list_id": "intel-wired-lan.osuosl.org",
        "list_email": "intel-wired-lan@osuosl.org",
        "web_url": "",
        "scm_url": "",
        "webscm_url": "",
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<20180723173752.19676-7-anirudh.venkataramanan@intel.com>",
    "list_archive_url": null,
    "date": "2018-07-23T17:37:45",
    "name": "[06/13] ice: Fix bugs in control queue processing",
    "commit_ref": null,
    "pull_url": null,
    "state": "changes-requested",
    "archived": false,
    "hash": "ec3e1a757456c05e82e6f136dde7a3dd3f2723a3",
    "submitter": {
        "id": 73601,
        "url": "http://patchwork.ozlabs.org/api/people/73601/?format=api",
        "name": "Anirudh Venkataramanan",
        "email": "anirudh.venkataramanan@intel.com"
    },
    "delegate": {
        "id": 68,
        "url": "http://patchwork.ozlabs.org/api/users/68/?format=api",
        "username": "jtkirshe",
        "first_name": "Jeff",
        "last_name": "Kirsher",
        "email": "jeffrey.t.kirsher@intel.com"
    },
    "mbox": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20180723173752.19676-7-anirudh.venkataramanan@intel.com/mbox/",
    "series": [
        {
            "id": 57101,
            "url": "http://patchwork.ozlabs.org/api/series/57101/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/list/?series=57101",
            "date": "2018-07-23T17:37:39",
            "name": "Bug fixes for ice",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/57101/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/947895/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/947895/checks/",
    "tags": {},
    "related": [],
    "headers": {
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            "intel-wired-lan@lists.osuosl.org"
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            "from fmsmga001.fm.intel.com ([10.253.24.23])\n\tby orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384;\n\t23 Jul 2018 10:38:00 -0700",
            "from shasta.jf.intel.com ([10.166.241.10])\n\tby fmsmga001.fm.intel.com with ESMTP; 23 Jul 2018 10:37:52 -0700"
        ],
        "X-Virus-Scanned": [
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        "X-IronPort-AV": "E=Sophos;i=\"5.51,394,1526367600\"; d=\"scan'208\";a=\"74790718\"",
        "From": "Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>",
        "To": "intel-wired-lan@lists.osuosl.org",
        "Date": "Mon, 23 Jul 2018 10:37:45 -0700",
        "Message-Id": "<20180723173752.19676-7-anirudh.venkataramanan@intel.com>",
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        "In-Reply-To": "<20180723173752.19676-1-anirudh.venkataramanan@intel.com>",
        "References": "<20180723173752.19676-1-anirudh.venkataramanan@intel.com>",
        "Subject": "[Intel-wired-lan] [PATCH 06/13] ice: Fix bugs in control queue\n\tprocessing",
        "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>",
        "List-Archive": "<http://lists.osuosl.org/pipermail/intel-wired-lan/>",
        "List-Post": "<mailto:intel-wired-lan@osuosl.org>",
        "List-Help": "<mailto:intel-wired-lan-request@osuosl.org?subject=help>",
        "List-Subscribe": "<https://lists.osuosl.org/mailman/listinfo/intel-wired-lan>, \n\t<mailto:intel-wired-lan-request@osuosl.org?subject=subscribe>",
        "MIME-Version": "1.0",
        "Content-Type": "text/plain; charset=\"us-ascii\"",
        "Content-Transfer-Encoding": "7bit",
        "Errors-To": "intel-wired-lan-bounces@osuosl.org",
        "Sender": "\"Intel-wired-lan\" <intel-wired-lan-bounces@osuosl.org>"
    },
    "content": "This patch is a consolidation of multiple bug fixes for control queue\nprocessing.\n\n1)  In ice_clean_adminq_subtask() remove unnecessary reads/writes to\n    registers. The bits PFINT_FW_CTL, PFINT_MBX_CTL and PFINT_SB_CTL\n    are not set when an interrupt arrives, which means that clearing them\n    again can be omitted.\n\n2)  Get an accurate value in \"pending\" by re-reading the control queue\n    head register from the hardware.\n\n3)  Fix a corner case involving lost control queue messages by checking\n    for new control messages (using ice_ctrlq_pending) before exiting the\n    cleanup routine.\n\nSigned-off-by: Anirudh Venkataramanan <anirudh.venkataramanan@intel.com>\n---\n drivers/net/ethernet/intel/ice/ice_controlq.c |  5 ++++-\n drivers/net/ethernet/intel/ice/ice_main.c     | 26 ++++++++++++++++++++++----\n 2 files changed, 26 insertions(+), 5 deletions(-)",
    "diff": "diff --git a/drivers/net/ethernet/intel/ice/ice_controlq.c b/drivers/net/ethernet/intel/ice/ice_controlq.c\nindex c064416080e7..62be72fdc8f3 100644\n--- a/drivers/net/ethernet/intel/ice/ice_controlq.c\n+++ b/drivers/net/ethernet/intel/ice/ice_controlq.c\n@@ -1065,8 +1065,11 @@ ice_clean_rq_elem(struct ice_hw *hw, struct ice_ctl_q_info *cq,\n \n clean_rq_elem_out:\n \t/* Set pending if needed, unlock and return */\n-\tif (pending)\n+\tif (pending) {\n+\t\t/* re-read HW head to calculate actual pending messages */\n+\t\tntu = (u16)(rd32(hw, cq->rq.head) & cq->rq.head_mask);\n \t\t*pending = (u16)((ntc > ntu ? cq->rq.count : 0) + (ntu - ntc));\n+\t}\n clean_rq_elem_err:\n \tmutex_unlock(&cq->rq_lock);\n \ndiff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c\nindex 450911345144..81b04e1d7ea2 100644\n--- a/drivers/net/ethernet/intel/ice/ice_main.c\n+++ b/drivers/net/ethernet/intel/ice/ice_main.c\n@@ -916,6 +916,21 @@ static int __ice_clean_ctrlq(struct ice_pf *pf, enum ice_ctl_q q_type)\n \treturn pending && (i == ICE_DFLT_IRQ_WORK);\n }\n \n+/**\n+ * ice_ctrlq_pending - check if there is a difference between ntc and ntu\n+ * @hw: pointer to hardware info\n+ * @cq: control queue information\n+ *\n+ * returns true if there are pending messages in a queue, false if there aren't\n+ */\n+static bool ice_ctrlq_pending(struct ice_hw *hw, struct ice_ctl_q_info *cq)\n+{\n+\tu16 ntu;\n+\n+\tntu = (u16)(rd32(hw, cq->rq.head) & cq->rq.head_mask);\n+\treturn cq->rq.next_to_clean != ntu;\n+}\n+\n /**\n  * ice_clean_adminq_subtask - clean the AdminQ rings\n  * @pf: board private structure\n@@ -923,7 +938,6 @@ static int __ice_clean_ctrlq(struct ice_pf *pf, enum ice_ctl_q q_type)\n static void ice_clean_adminq_subtask(struct ice_pf *pf)\n {\n \tstruct ice_hw *hw = &pf->hw;\n-\tu32 val;\n \n \tif (!test_bit(__ICE_ADMINQ_EVENT_PENDING, pf->state))\n \t\treturn;\n@@ -933,9 +947,13 @@ static void ice_clean_adminq_subtask(struct ice_pf *pf)\n \n \tclear_bit(__ICE_ADMINQ_EVENT_PENDING, pf->state);\n \n-\t/* re-enable Admin queue interrupt causes */\n-\tval = rd32(hw, PFINT_FW_CTL);\n-\twr32(hw, PFINT_FW_CTL, (val | PFINT_FW_CTL_CAUSE_ENA_M));\n+\t/* There might be a situation where new messages arrive to a control\n+\t * queue between processing the last message and clearing the\n+\t * EVENT_PENDING bit. So before exiting, check queue head again (using\n+\t * ice_ctrlq_pending) and process new messages if any.\n+\t */\n+\tif (ice_ctrlq_pending(hw, &hw->adminq))\n+\t\t__ice_clean_ctrlq(pf, ICE_CTL_Q_ADMIN);\n \n \tice_flush(hw);\n }\n",
    "prefixes": [
        "06/13"
    ]
}