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[
    {
        "id": 116432,
        "web_url": "https://patches.dpdk.org/comment/116432/",
        "msgid": "<87f4dd1f-0882-1dc3-0804-588ab7eb407e@intel.com>",
        "date": "2020-07-21T17:25:14",
        "subject": "Re: [dpdk-dev] [PATCH v2] net/vhost: support queue update",
        "submitter": {
            "id": 324,
            "url": "https://patches.dpdk.org/api/people/324/",
            "name": "Ferruh Yigit",
            "email": "ferruh.yigit@intel.com"
        },
        "content": "On 7/21/2020 5:38 PM, Matan Azrad wrote:\n> The commit below changed the readiness condition of vhost device to fix\n> multi-queues issues showed with QEMU versions.\n> \n> Now, the vhost device is ready when the first queue-pair is ready.\n> When more queues are being ready, the queue state callback will be\n> triggered to notify the vhost manager.\n> \n> In case of Rx interrupt configuration, the vhost driver set the\n> kickfd queue file descriptor in order to be notified on Rx traffic.\n> \n> So, when queue becomes ready, the kickfd may be changed and should be\n> updated in the Rx interrupt structure.\n> \n> Update kickfd when the queue state callback is invoked.\n> Also update event notification when it is enabled by the user.\n> \n> Fixes: d0fcc38f5fa4 (\"vhost: improve device readiness notifications\")\n> \n> Signed-off-by: Matan Azrad <matan@mellanox.com>\n\nSuggested-by: Marvin Liu <yong.liu@intel.com>\n\n\nThis patch addresses a ~%20 performance drop in vhost reported with -rc1.\n\nAlthough it is missing component maintainers ack, I will merge it relying on\noffline discussion Maxime, Matan, Marvin & Chenbo involved, to address the\nperformance issue observed in -rc2.\nHopefully won't but if we observe issues with this patch, there will be time to\naddress it before -rc3, I believe it is safer/better to merge it for -rc2 than\nholding this fix till -rc3, at least it can be verified this way as part of -rc2.\n\nApplied to dpdk-next-net/master, thanks.",
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            "References": "<1595175493-21497-1-git-send-email-matan@mellanox.com>\n <20200721163816.15057-1-matan@mellanox.com>",
            "Subject": "Re: [dpdk-dev] [PATCH v2] net/vhost: support queue update",
            "Content-Type": "text/plain; charset=utf-8",
            "From": "Ferruh Yigit <ferruh.yigit@intel.com>",
            "Received": [
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            "Message-ID": "<87f4dd1f-0882-1dc3-0804-588ab7eb407e@intel.com>",
            "Date": "Tue, 21 Jul 2020 18:25:14 +0100",
            "Content-Transfer-Encoding": "8bit",
            "To": "Matan Azrad <matan@mellanox.com>,\n Maxime Coquelin <maxime.coquelin@redhat.com>",
            "Delivered-To": "patchwork@inbox.dpdk.org",
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            "In-Reply-To": "<20200721163816.15057-1-matan@mellanox.com>",
            "Cc": "dev@dpdk.org, chenbo.xia@intel.com, david.marchand@redhat.com,\n thomas@monjalon.net, Marvin Liu <yong.liu@intel.com>",
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            "Content-Language": "en-US"
        }
    },
    {
        "id": 116435,
        "web_url": "https://patches.dpdk.org/comment/116435/",
        "msgid": "<556ff867-3a34-f81d-8acb-8630adaedf38@redhat.com>",
        "date": "2020-07-21T17:27:45",
        "subject": "Re: [dpdk-dev] [PATCH v2] net/vhost: support queue update",
        "submitter": {
            "id": 512,
            "url": "https://patches.dpdk.org/api/people/512/",
            "name": "Maxime Coquelin",
            "email": "maxime.coquelin@redhat.com"
        },
        "content": "Thanks Matan for the fix.\n\nOn 7/21/20 6:38 PM, Matan Azrad wrote:\n> The commit below changed the readiness condition of vhost device to fix\n> multi-queues issues showed with QEMU versions.\n> \n> Now, the vhost device is ready when the first queue-pair is ready.\n> When more queues are being ready, the queue state callback will be\n> triggered to notify the vhost manager.\n> \n> In case of Rx interrupt configuration, the vhost driver set the\n> kickfd queue file descriptor in order to be notified on Rx traffic.\n> \n> So, when queue becomes ready, the kickfd may be changed and should be\n> updated in the Rx interrupt structure.\n> \n> Update kickfd when the queue state callback is invoked.\n> Also update event notification when it is enabled by the user.\n> \n> Fixes: d0fcc38f5fa4 (\"vhost: improve device readiness notifications\")\n> \n> Signed-off-by: Matan Azrad <matan@mellanox.com>\n> ---\n>  drivers/net/vhost/rte_eth_vhost.c | 49 +++++++++++++++++++++++++++++++\n>  1 file changed, 49 insertions(+)\n> \n> diff --git a/drivers/net/vhost/rte_eth_vhost.c b/drivers/net/vhost/rte_eth_vhost.c\n> index 9fbf39f66b..bbf79b2c0e 100644\n> --- a/drivers/net/vhost/rte_eth_vhost.c\n> +++ b/drivers/net/vhost/rte_eth_vhost.c\n> @@ -94,6 +94,7 @@ struct vhost_queue {\n>  \tstruct rte_mempool *mb_pool;\n>  \tuint16_t port;\n>  \tuint16_t virtqueue_id;\n> +\tbool intr_en;\n>  \tstruct vhost_stats stats;\n>  };\n>  \n> @@ -546,6 +547,8 @@ eth_rxq_intr_enable(struct rte_eth_dev *dev, uint16_t qid)\n>  \trte_vhost_enable_guest_notification(vq->vid, (qid << 1) + 1, 1);\n>  \trte_wmb();\n>  \n> +\tvq->intr_en = true;\n> +\n>  \treturn ret;\n>  }\n>  \n> @@ -571,6 +574,8 @@ eth_rxq_intr_disable(struct rte_eth_dev *dev, uint16_t qid)\n>  \trte_vhost_enable_guest_notification(vq->vid, (qid << 1) + 1, 0);\n>  \trte_wmb();\n>  \n> +\tvq->intr_en = false;\n> +\n>  \treturn 0;\n>  }\n>  \n> @@ -830,6 +835,45 @@ destroy_device(int vid)\n>  \t_rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_INTR_LSC, NULL);\n>  }\n>  \n> +static int\n> +vring_conf_update(int vid, struct rte_eth_dev *eth_dev, uint16_t vring_id)\n> +{\n> +\tstruct rte_eth_conf *dev_conf = &eth_dev->data->dev_conf;\n> +\tstruct pmd_internal *internal = eth_dev->data->dev_private;\n> +\tstruct rte_vhost_vring vring;\n> +\tstruct vhost_queue *vq;\n> +\tint rx_idx = vring_id % 2 ? (vring_id - 1) >> 1 : -1;\n> +\tint ret = 0;\n> +\n> +\t/*\n> +\t * The vring kickfd may be changed after the new device notification.\n> +\t * Update it when the vring state is updated.\n> +\t */\n> +\tif (rx_idx >= 0 && rx_idx < eth_dev->data->nb_rx_queues &&\n> +\t    rte_atomic32_read(&internal->dev_attached) &&\n> +\t    rte_atomic32_read(&internal->started) &&\n> +\t    dev_conf->intr_conf.rxq) {\n\nI am not sure we need to filter on rxq, we could just call\nrte_vhost_enable_guest_notification(). It would be disabled for tx\nqueues, as it is done in the .new_device callback so harmless and this\nfunction would be simpler.\n\nBut I think your code work, so we should get it in -rc2 to get proper\ntesting:\n\nReviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>\n\nThanks,\nMaxime\n\n> +\t\tvq = eth_dev->data->rx_queues[rx_idx];\n> +\t\tret = rte_vhost_get_vhost_vring(vid, vring_id, &vring);\n> +\t\tif (!ret) {\n> +\t\t\tif (vring.kickfd !=\n> +\t\t\t    eth_dev->intr_handle->efds[rx_idx]) {\n> +\t\t\t\tVHOST_LOG(INFO,\n> +\t\t\t\t\t  \"kickfd for rxq-%d was changed.\\n\",\n> +\t\t\t\t\t  rx_idx);\n> +\t\t\t\teth_dev->intr_handle->efds[rx_idx] =\n> +\t\t\t\t\t\t\t\t   vring.kickfd;\n> +\t\t\t}\n> +\n> +\t\t\trte_vhost_enable_guest_notification(vid, vring_id,\n> +\t\t\t\t\t\t\t    vq->intr_en);\n> +\t\t\trte_wmb();\n> +\t\t}\n> +\t}\n> +\n> +\treturn ret;\n> +}\n> +\n>  static int\n>  vring_state_changed(int vid, uint16_t vring, int enable)\n>  {\n> @@ -848,6 +892,11 @@ vring_state_changed(int vid, uint16_t vring, int enable)\n>  \teth_dev = list->eth_dev;\n>  \t/* won't be NULL */\n>  \tstate = vring_states[eth_dev->data->port_id];\n> +\n> +\tif (enable && vring_conf_update(vid, eth_dev, vring))\n> +\t\tVHOST_LOG(INFO, \"Failed to update vring-%d configuration.\\n\",\n> +\t\t\t  (int)vring);\n> +\n>  \trte_spinlock_lock(&state->lock);\n>  \tif (state->cur[vring] == enable) {\n>  \t\trte_spinlock_unlock(&state->lock);\n>",
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            "Subject": "Re: [dpdk-dev] [PATCH v2] net/vhost: support queue update",
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