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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 May 2021 16:48:12.4186 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2b30b092-b8a2-4be2-a936-08d913d36649 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AM5EUR03FT056.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR08MB3811 Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable +Ard's new e-mail address Jared, please confirm this is a "Reviewed-By" > -----Original Message----- > From: Jared McNeill > Sent: Friday, April 30, 2021 6:30 AM > To: Jeremy Linton > Cc: devel@edk2.groups.io; Ard Biesheuvel ; > leif@nuviainc.com; Pete Batard ; Samer El-Haj-Mahmoud > ; Andrei Warkentin > (awarkentin@vmware.com) > Subject: Re: [PATCH 1/2] Silicon/Broadcom/BcmGenetDxe: Delay for linkup i= n > transmit > > LGTM. > > Take care, > Jared > > > > On Apr 29, 2021, at 5:19 PM, Jeremy Linton > wrote: > > > > +Jared McNeill for review. > > > > Thanks, > > > > On 4/15/21 2:22 PM, Jeremy Linton wrote: > >> Under normal circumstances GenetSimpleNetworkTransmit won't be > called > >> unless the rest of the network stack detects the link is up. So, > >> during normal operation when the adapter is initialized the link > >> naturally transitions to link up, and then is ready for activity > >> later in the boot sequence. If that hasn't happened by the time PXE > >> runs then it will itself wait for the link. > >> OTOH, the normal distro PXE sequence involves PXE loading shim which > >> in turn loads grub, which tries to read machine specific configs, > >> modules, and grub.cfg in order to prepare the boot menu. > >> Then, once a grub selection is picked, it might try to load the > >> kernel+initrd. > >> In this sequence the network stack is shutdown and restarted multiple > >> times. Grub though, starts up, notices its been network booted, reads > >> saved network parameters and immediately tries to transmit data > >> assuming the link is still up. > >> When that happens grub will print "couldn't send network packet" > >> and if that lasts long enough it fails to load grub.cfg and the user > >> gets dropped to the grub prompt because no one in the path bothers to > >> assure the link state has transitioned back up. > >> For reference: https://github.com/pftf/RPi4/issues/113 > >> Signed-off-by: Jeremy Linton > >> --- > >> .../Drivers/Net/BcmGenetDxe/SimpleNetwork.c | 24 > ++++++++++++++++++++-- > >> 1 file changed, 22 insertions(+), 2 deletions(-) diff --git > >> a/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/SimpleNetwork.c > >> b/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/SimpleNetwork.c > >> index 1bda18f157..29c76d8495 100644 > >> --- a/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/SimpleNetwork.c > >> +++ b/Silicon/Broadcom/Drivers/Net/BcmGenetDxe/SimpleNetwork.c > >> @@ -13,6 +13,7 @@ > >> #include > >> #include > >> #include > >> +#include > >> #include > >> #include "BcmGenetDxe.h" > >> @@ -590,9 +591,28 @@ GenetSimpleNetworkTransmit ( > >> if (!Genet->SnpMode.MediaPresent) { > >> // > >> - // Don't bother transmitting if there's no link. > >> + // We should only really get here if the link was up > >> + // and is now down due to a stop/shutdown sequence, and > >> + // the app (grub) doesn't bother to check link state > >> + // because it was up a moment before. > >> + // Lets wait a bit for the link to resume, rather than > >> + // failing to send. In the case of grub it works either way > >> + // but we can't be sure that is universally true, and > >> + // hanging for a couple seconds is nicer than a screen of > >> + // grub send failure messages. > >> // > >> - return EFI_NOT_READY; > >> + int retries =3D 1000; > >> + DEBUG ((DEBUG_INFO, "%a: Waiting 10s for link\n", __FUNCTION__)); > >> + do { > >> + gBS->Stall (10000); > >> + Status =3D GenericPhyUpdateConfig (&Genet->Phy); > >> + } while (EFI_ERROR (Status) && retries--); > >> + if (EFI_ERROR (Status)) { > >> + DEBUG ((DEBUG_ERROR, "%a: no link\n", __FUNCTION__)); > >> + return EFI_NOT_READY; > >> + } else { > >> + Genet->SnpMode.MediaPresent =3D TRUE; > >> + } > >> } > >> if (HeaderSize !=3D 0) { > > IMPORTANT NOTICE: The contents of this email and any attachments are confid= ential and may also be privileged. If you are not the intended recipient, p= lease notify the sender immediately and do not disclose the contents to any= other person, use it for any purpose, or store or copy the information in = any medium. Thank you.