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Message-ID: <20230705104731.GM6455@unreal>
Date: Wed, 5 Jul 2023 13:47:31 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>
Cc: kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
decui@...rosoft.com, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, longli@...rosoft.com,
sharmaajay@...rosoft.com, cai.huoqing@...ux.dev,
ssengar@...ux.microsoft.com, vkuznets@...hat.com,
tglx@...utronix.de, linux-hyperv@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-rdma@...r.kernel.org, stable@...r.kernel.org,
schakrabarti@...rosoft.com
Subject: Re: [PATCH net] net: mana: Configure hwc timeout from hardware
On Wed, Jul 05, 2023 at 02:32:58AM -0700, Souradeep Chakrabarti wrote:
> At present hwc timeout value is a fixed value.
> This patch sets the hwc timeout from the hardware.
>
> Signed-off-by: Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>
> ---
> .../net/ethernet/microsoft/mana/gdma_main.c | 27 +++++++++++++++++++
> .../net/ethernet/microsoft/mana/hw_channel.c | 25 ++++++++++++++++-
> include/net/mana/gdma.h | 20 +++++++++++++-
> include/net/mana/hw_channel.h | 5 ++++
> 4 files changed, 75 insertions(+), 2 deletions(-)
We are in merge window now, it is not net material.
>
> diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> index 8f3f78b68592..5d30347e0137 100644
> --- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
> +++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
> @@ -106,6 +106,30 @@ static int mana_gd_query_max_resources(struct pci_dev *pdev)
> return 0;
> }
>
> +static int mana_gd_query_hwc_timeout(struct pci_dev *pdev, u32 *timeout_val)
> +{
Callers are not checking return value, so or make this function void or
check return value.
> + struct gdma_context *gc = pci_get_drvdata(pdev);
> + struct gdma_query_hwc_timeout_req req = {};
> + struct gdma_query_hwc_timeout_resp resp = {};
> + int err;
> +
> + mana_gd_init_req_hdr(&req.hdr, GDMA_QUERY_HWC_TIMEOUT,
> + sizeof(req), sizeof(resp));
> + req.timeout_ms = *timeout_val;
> + err = mana_gd_send_request(gc, sizeof(req), &req, sizeof(resp), &resp);
> + if (err || resp.hdr.status) {
I see this check almost in all callers to mana_gd_send_request(). It
will be nice if mana_gd_send_request() would check status internally
and return error.
> + dev_err(gc->dev, "Failed to query timeout: %d, 0x%x\n", err,
> + resp.hdr.status);
> + return err ? err : -EPROTO;
> + }
> +
> + *timeout_val = resp.timeout_ms;
> + dev_info(gc->dev, "Successfully changed the timeout value %u\n",
> + *timeout_val);
> +
> + return 0;
> +}
> +
> static int mana_gd_detect_devices(struct pci_dev *pdev)
> {
> struct gdma_context *gc = pci_get_drvdata(pdev);
> @@ -879,6 +903,7 @@ int mana_gd_verify_vf_version(struct pci_dev *pdev)
> struct gdma_context *gc = pci_get_drvdata(pdev);
> struct gdma_verify_ver_resp resp = {};
> struct gdma_verify_ver_req req = {};
> + struct hw_channel_context *hwc = gc->hwc.driver_data;
> int err;
>
> mana_gd_init_req_hdr(&req.hdr, GDMA_VERIFY_VF_DRIVER_VERSION,
> @@ -907,6 +932,8 @@ int mana_gd_verify_vf_version(struct pci_dev *pdev)
> err, resp.hdr.status);
> return err ? err : -EPROTO;
> }
> + if (resp.pf_cap_flags1 & GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG)
> + mana_gd_query_hwc_timeout(pdev, &hwc->hwc_timeout);
>
> return 0;
> }
> diff --git a/drivers/net/ethernet/microsoft/mana/hw_channel.c b/drivers/net/ethernet/microsoft/mana/hw_channel.c
> index 9d1507eba5b9..f5980c26fd09 100644
> --- a/drivers/net/ethernet/microsoft/mana/hw_channel.c
> +++ b/drivers/net/ethernet/microsoft/mana/hw_channel.c
> @@ -174,7 +174,25 @@ static void mana_hwc_init_event_handler(void *ctx, struct gdma_queue *q_self,
> complete(&hwc->hwc_init_eqe_comp);
> break;
>
> + case GDMA_EQE_HWC_SOC_RECONFIG_DATA:
> + type_data.as_uint32 = event->details[0];
> + type = type_data.type;
> + val = type_data.value;
> +
> + switch (type) {
> + case HWC_DATA_CFG_HWC_TIMEOUT:
> + hwc->hwc_timeout = val;
> + break;
> +
> + default:
> + dev_warn(hwc->dev, "Received unknown reconfig type %u\n", type);
> + break;
> + }
> +
> + break;
> +
> default:
> + dev_warn(hwc->dev, "Received unknown gdma event %u\n", event->type);
> /* Ignore unknown events, which should never happen. */
> break;
> }
> @@ -704,6 +722,7 @@ int mana_hwc_create_channel(struct gdma_context *gc)
> gd->pdid = INVALID_PDID;
> gd->doorbell = INVALID_DOORBELL;
>
> + hwc->hwc_timeout = HW_CHANNEL_WAIT_RESOURCE_TIMEOUT_MS;
> /* mana_hwc_init_queues() only creates the required data structures,
> * and doesn't touch the HWC device.
> */
> @@ -770,6 +789,8 @@ void mana_hwc_destroy_channel(struct gdma_context *gc)
> hwc->gdma_dev->doorbell = INVALID_DOORBELL;
> hwc->gdma_dev->pdid = INVALID_PDID;
>
> + hwc->hwc_timeout = 0;
> +
> kfree(hwc);
> gc->hwc.driver_data = NULL;
> gc->hwc.gdma_context = NULL;
> @@ -818,6 +839,7 @@ int mana_hwc_send_request(struct hw_channel_context *hwc, u32 req_len,
> dest_vrq = hwc->pf_dest_vrq_id;
> dest_vrcq = hwc->pf_dest_vrcq_id;
> }
> + dev_err(hwc->dev, "HWC: timeout %u ms\n", hwc->hwc_timeout);
>
> err = mana_hwc_post_tx_wqe(txq, tx_wr, dest_vrq, dest_vrcq, false);
> if (err) {
> @@ -825,7 +847,8 @@ int mana_hwc_send_request(struct hw_channel_context *hwc, u32 req_len,
> goto out;
> }
>
> - if (!wait_for_completion_timeout(&ctx->comp_event, 30 * HZ)) {
> + if (!wait_for_completion_timeout(&ctx->comp_event,
> + (hwc->hwc_timeout / 1000) * HZ)) {
> dev_err(hwc->dev, "HWC: Request timed out!\n");
> err = -ETIMEDOUT;
> goto out;
> diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h
> index 96c120160f15..88b6ef7ce1a6 100644
> --- a/include/net/mana/gdma.h
> +++ b/include/net/mana/gdma.h
> @@ -33,6 +33,7 @@ enum gdma_request_type {
> GDMA_DESTROY_PD = 30,
> GDMA_CREATE_MR = 31,
> GDMA_DESTROY_MR = 32,
> + GDMA_QUERY_HWC_TIMEOUT = 84, /* 0x54 */
> };
>
> #define GDMA_RESOURCE_DOORBELL_PAGE 27
> @@ -57,6 +58,8 @@ enum gdma_eqe_type {
> GDMA_EQE_HWC_INIT_EQ_ID_DB = 129,
> GDMA_EQE_HWC_INIT_DATA = 130,
> GDMA_EQE_HWC_INIT_DONE = 131,
> + GDMA_EQE_HWC_SOC_RECONFIG = 132,
> + GDMA_EQE_HWC_SOC_RECONFIG_DATA = 133,
> };
>
> enum {
> @@ -531,10 +534,12 @@ enum {
> * so the driver is able to reliably support features like busy_poll.
> */
> #define GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX BIT(2)
> +#define GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG BIT(3)
>
> #define GDMA_DRV_CAP_FLAGS1 \
> (GDMA_DRV_CAP_FLAG_1_EQ_SHARING_MULTI_VPORT | \
> - GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX)
> + GDMA_DRV_CAP_FLAG_1_NAPI_WKDONE_FIX | \
> + GDMA_DRV_CAP_FLAG_1_HWC_TIMEOUT_RECONFIG)
>
> #define GDMA_DRV_CAP_FLAGS2 0
>
> @@ -664,6 +669,19 @@ struct gdma_disable_queue_req {
> u32 alloc_res_id_on_creation;
> }; /* HW DATA */
>
> +/* GDMA_QUERY_HWC_TIMEOUT */
> +struct gdma_query_hwc_timeout_req {
> + struct gdma_req_hdr hdr;
> + u32 timeout_ms;
> + u32 reserved;
> +};
> +
> +struct gdma_query_hwc_timeout_resp {
> + struct gdma_resp_hdr hdr;
> + u32 timeout_ms;
> + u32 reserved;
> +};
> +
> enum atb_page_size {
> ATB_PAGE_SIZE_4K,
> ATB_PAGE_SIZE_8K,
> diff --git a/include/net/mana/hw_channel.h b/include/net/mana/hw_channel.h
> index 6a757a6e2732..3d3b5c881bc1 100644
> --- a/include/net/mana/hw_channel.h
> +++ b/include/net/mana/hw_channel.h
> @@ -23,6 +23,10 @@
> #define HWC_INIT_DATA_PF_DEST_RQ_ID 10
> #define HWC_INIT_DATA_PF_DEST_CQ_ID 11
>
> +#define HWC_DATA_CFG_HWC_TIMEOUT 1
> +
> +#define HW_CHANNEL_WAIT_RESOURCE_TIMEOUT_MS 30000
> +
> /* Structures labeled with "HW DATA" are exchanged with the hardware. All of
> * them are naturally aligned and hence don't need __packed.
> */
> @@ -182,6 +186,7 @@ struct hw_channel_context {
>
> u32 pf_dest_vrq_id;
> u32 pf_dest_vrcq_id;
> + u32 hwc_timeout;
>
> struct hwc_caller_ctx *caller_ctx;
> };
> --
> 2.34.1
>
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