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[efi] Disable SNP devices when running iPXE as the application

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Some UEFI builds will set up a timer to continuously poll any SNP
devices.  This can drain packets from the network device's receive
queue before iPXE gets a chance to process them.

Use netdev_rx_[un]freeze() to explicitly indicate when we expect our
network devices to be driven via the external SNP API (as we do with
the UNDI API on the standard BIOS build), and disable the SNP API
except when receive queue processing is frozen.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-03-14 14:16:05 +00:00
parent f618178e60
commit f473b9c3f6
4 changed files with 138 additions and 9 deletions
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4
src/image/efi_image.c
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@@ -219,6 +219,9 @@ static int efi_image_exec ( struct image *image ) {
loaded.image->LoadOptionsSize =
( ( wcslen ( cmdline ) + 1 /* NUL */ ) * sizeof ( wchar_t ) );
/* Release network devices for use via SNP */
efi_snp_release();
/* Start the image */
if ( ( efirc = bs->StartImage ( handle, NULL, NULL ) ) != 0 ) {
rc = -EEFI_START ( efirc );
@@ -231,6 +234,7 @@ static int efi_image_exec ( struct image *image ) {
rc = 0;
err_start_image:
efi_snp_claim();
err_open_protocol:
/* Unload the image. We can't leave it loaded, because we
* have no "unload" operation.