Re: [edk2-devel] [PATCH 1/3] UsbNetworkPkg/UsbRndis: Add USB RNDIS devices support

["Rebecca Cran" <rebecca@bsdio.com>]

Hi Richard,


I've continued working on my USB EEM support, and just pushed my changes 
to https://github.com/bcran/edk2/tree/usb-net .

I was wondering when you think you might have the next set of patches 
ready for review?


Thanks.

Rebecca Cran


On 1/12/23 01:36, RichardHo [何明忠] via groups.io wrote:
> Hi Michael,
>
> We add this patch in my X86 platform and use the NCM device to test IPV4 PXE boot from 1330MB ISO file.
>
> No this patch: 35 sec to download 1330M ISO file
> Add this patch: 181  sec to download 1330M ISO file
>
> The patch will increase boot time in my X86 platform.
>
> Thanks,
> Richard
>
> -----Original Message-----
> From: Michael Brown <mcb30@ipxe.org>
> Sent: 2023年1月10日 7:50 AM
> To: devel@edk2.groups.io; tinhnguyen@os.amperecomputing.com; Richard Ho (何明忠) <RichardHo@ami.com>
> Subject: [EXTERNAL] Re: [edk2-devel] [PATCH 1/3] UsbNetworkPkg/UsbRndis: Add USB RNDIS devices support
>
>
> **CAUTION: The e-mail below is from an external source. Please exercise caution before opening attachments, clicking links, or following guidance.**
>
> On 08/01/2023 10:41, tinhnguyen via groups.io wrote:
>> The root cause is that we spend a long time waiting for USB
>> UsbBulkTransfer to complete, but if there is no data to communicate
>> -> it will always time out.
> Coincidentally, I have just implemented a fix for this.  It works by implementing a simple credit-based rate limiter.  Calls to
> UsbEthReceive() are limited to 10 per second while the receive datapath is idle.  No limiting takes place while the receive datapath is active.
>
> I have tried to match the existing code style (i.e. zero explanatory comments).
>
> Richard Ho: please consider using this rate limiting approach (or something very similar).
>
> Patch inline below:
>
> diff --git a/UsbNetworkPkg/Include/Protocol/EdkIIUsbEthernetProtocol.h
> b/UsbNetworkPkg/Include/Protocol/EdkIIUsbEthernetProtocol.h
> index df6ebc64ef..d0e2048114 100644
> --- a/UsbNetworkPkg/Include/Protocol/EdkIIUsbEthernetProtocol.h
> +++ b/UsbNetworkPkg/Include/Protocol/EdkIIUsbEthernetProtocol.h
> @@ -160,6 +160,8 @@ typedef struct {
>      UINT8                          CurrentNodeAddress[PXE_MAC_LENGTH];
>      UINT8                          BroadcastNodeAddress[PXE_MAC_LENGTH];
>      EFI_USB_DEVICE_REQUEST         Request;
> +  EFI_EVENT                      RateLimiter;
> +  UINTN                          RateLimitCredit;
>    } NIC_DATA;
>
>    #define NIC_DATA_SIGNATURE  SIGNATURE_32('n', 'i', 'c', 'd') diff --git a/UsbNetworkPkg/NetworkCommon/DriverBinding.h
> b/UsbNetworkPkg/NetworkCommon/DriverBinding.h
> index 946727ffc9..ae1d3c201e 100644
> --- a/UsbNetworkPkg/NetworkCommon/DriverBinding.h
> +++ b/UsbNetworkPkg/NetworkCommon/DriverBinding.h
> @@ -25,6 +25,8 @@
>    #define RX_BUFFER_COUNT                  32
>    #define TX_BUFFER_COUNT                  32
>    #define MEMORY_REQUIRE                   0
> +#define RATE_LIMITER_INTERVAL            1000000  // 10Hz
> +#define RATE_LIMITER_BURST               10
>
>    #define UNDI_DEV_SIGNATURE  SIGNATURE_32('u','n','d','i')
>    #define UNDI_DEV_FROM_THIS(a)  CR(a, NIC_DEVICE, NiiProtocol,
> UNDI_DEV_SIGNATURE)
> diff --git a/UsbNetworkPkg/NetworkCommon/PxeFunction.c
> b/UsbNetworkPkg/NetworkCommon/PxeFunction.c
> index fd53a215a4..2a9b4f6111 100644
> --- a/UsbNetworkPkg/NetworkCommon/PxeFunction.c
> +++ b/UsbNetworkPkg/NetworkCommon/PxeFunction.c
> @@ -29,6 +29,21 @@ API_FUNC  gUndiApiTable[] = {
>      UndiReceive
>    };
>
> +STATIC
> +VOID
> +EFIAPI
> +UndiRateLimiterCallback (
> +  IN  EFI_EVENT Event,
> +  IN  VOID      *Context
> +  )
> +{
> +  NIC_DATA *Nic = Context;
> +
> +  if (Nic->RateLimitCredit < RATE_LIMITER_BURST) {
> +    Nic->RateLimitCredit++;
> +  }
> +}
> +
>    /**
>      This command is used to determine the operational state of the UNDI.
>
> @@ -100,9 +115,6 @@ UndiStart (
>        Cdb->StatFlags = PXE_STATFLAGS_COMMAND_FAILED;
>        Cdb->StatCode  = PXE_STATCODE_INVALID_CDB;
>        return;
> -  } else {
> -    Cdb->StatFlags = PXE_STATFLAGS_COMMAND_COMPLETE;
> -    Cdb->StatCode  = PXE_STATCODE_SUCCESS;
>      }
>
>      if (Nic->State != PXE_STATFLAGS_GET_STATE_STOPPED) { @@ -120,14 +132,46 @@ UndiStart (
>      Nic->PxeStart.UnMap_Mem = 0;
>      Nic->PxeStart.Sync_Mem  = Cpb->Sync_Mem;
>      Nic->PxeStart.Unique_ID = Cpb->Unique_ID;
> -  Nic->State              = PXE_STATFLAGS_GET_STATE_STARTED;
> +
> +  Status = gBS->CreateEvent (
> +    EVT_TIMER | EVT_NOTIFY_SIGNAL,
> +    TPL_CALLBACK,
> +    UndiRateLimiterCallback,
> +    Nic,
> +    &Nic->RateLimiter
> +    );
> +  if (EFI_ERROR (Status)) {
> +    goto ErrorCreateEvent;
> +  }
> +
> +  Status = gBS->SetTimer (
> +    Nic->RateLimiter,
> +    TimerPeriodic,
> +    RATE_LIMITER_INTERVAL
> +    );
> +  if (EFI_ERROR (Status)) {
> +    goto ErrorSetTimer;
> +  }
>
>      if (Nic->UsbEth->UsbEthUndi.UsbEthUndiStart != NULL) {
>        Status = Nic->UsbEth->UsbEthUndi.UsbEthUndiStart (Cdb, Nic);
>        if (EFI_ERROR (Status)) {
> -      Cdb->StatFlags = PXE_STATFLAGS_COMMAND_FAILED;
> +      goto ErrorUndiStart;
>        }
>      }
> +
> +  Nic->State     = PXE_STATFLAGS_GET_STATE_STARTED;
> +  Cdb->StatFlags = PXE_STATFLAGS_COMMAND_COMPLETE;  Cdb->StatCode  =
> + PXE_STATCODE_SUCCESS;  return;
> +
> + ErrorUndiStart:
> +  gBS->SetTimer (&Nic->RateLimiter, TimerCancel, 0);
> + ErrorSetTimer:
> +  gBS->CloseEvent (&Nic->RateLimiter);
> + ErrorCreateEvent:
> +  Cdb->StatFlags = PXE_STATFLAGS_COMMAND_FAILED;  Cdb->StatCode  =
> + PXE_STATCODE_DEVICE_FAILURE;
>    }
>
>    /**
> @@ -183,6 +227,10 @@ UndiStop (
>      Nic->PxeStart.Sync_Mem  = 0;
>      Nic->State              = PXE_STATFLAGS_GET_STATE_STOPPED;
>
> +  gBS->SetTimer (&Nic->RateLimiter, TimerCancel, 0);
> +
> +  gBS->CloseEvent (&Nic->RateLimiter);
> +
>      if (Nic->UsbEth->UsbEthUndi.UsbEthUndiStop != NULL) {
>        Status = Nic->UsbEth->UsbEthUndi.UsbEthUndiStop (Cdb, Nic);
>        if (EFI_ERROR (Status)) {
> @@ -1506,8 +1554,13 @@ Receive (
>      }
>
>      while (1) {
> +    if (Nic->RateLimitCredit == 0) {
> +      break;
> +    }
> +
>        Status = Nic->UsbEth->UsbEthReceive (Cdb, Nic->UsbEth, (VOID *)BulkInData, &DataLength);
>        if (EFI_ERROR (Status)) {
> +      Nic->RateLimitCredit--;
>          break;
>        }
>
>
> Thanks,
>
> Michael
>
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