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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/include/ipxe/efi/efi_snp.h
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@@ -32,6 +32,8 @@ struct efi_snp_device {
EFI_SIMPLE_NETWORK_PROTOCOL snp;
/** The SNP "mode" (parameters) */
EFI_SIMPLE_NETWORK_MODE mode;
/** Started flag */
int started;
/** Outstanding TX packet count (via "interrupt status")
*
* Used in order to generate TX completions.
@@ -75,5 +77,7 @@ struct efi_snp_device {
extern int efi_snp_hii_install ( struct efi_snp_device *snpdev );
extern void efi_snp_hii_uninstall ( struct efi_snp_device *snpdev );
extern struct efi_snp_device * last_opened_snpdev ( void );
extern void efi_snp_claim ( void );
extern void efi_snp_release ( void );
#endif /* _IPXE_EFI_SNP_H */