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From 17bd27e298d2b27859c8c6ee2e654d8f03988c42 Mon Sep 17 00:00:00 2001
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From: Josef Bacik <jbacik@fb.com>
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Date: Thu, 6 Aug 2015 10:49:46 -0700
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Subject: [PATCH 08/23] efinet: handle get_status() on buggy firmware properly
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The EFI spec indicates that get_status() should return the address of the buffer
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we passed into transmit to indicate the the buffer was transmitted. However we
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have boxes where the firmware returns some arbitrary address instead, which
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makes grub think that we've not sent anything. So since we have the SNP stuff
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opened in exclusive mode just assume any non-NULL txbuf means that our transmit
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occurred properly. This makes grub able to do its networking stuff properly on
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our broken firmware. Thanks,
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cc: Peter Jones <pjones@redhat.com>
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Signed-off-by: Josef Bacik <jbacik@fb.com>
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---
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grub-core/net/drivers/efi/efinet.c | 21 +++++++++++----------
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1 file changed, 11 insertions(+), 10 deletions(-)
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diff --git a/grub-core/net/drivers/efi/efinet.c b/grub-core/net/drivers/efi/efinet.c
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index 7b8c4a5..ea0e0ca 100644
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--- a/grub-core/net/drivers/efi/efinet.c
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+++ b/grub-core/net/drivers/efi/efinet.c
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@@ -47,19 +47,19 @@ send_card_buffer (struct grub_net_card *dev,
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if (st != GRUB_EFI_SUCCESS)
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return grub_error (GRUB_ERR_IO,
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N_("couldn't send network packet"));
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- if (txbuf == dev->txbuf)
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+ /*
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+ Some buggy firmware could return an arbitrary address instead of the
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+ txbuf address we trasmitted, so just check that txbuf is non NULL
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+ for success. This is ok because we open the SNP protocol in
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+ exclusive mode so we know we're the only ones transmitting on this
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+ box and since we only transmit one packet at a time we know our
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+ transmit was successfull.
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+ */
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+ if (txbuf)
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{
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dev->txbusy = 0;
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break;
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}
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- if (txbuf)
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- {
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- st = efi_call_7 (net->transmit, net, 0, dev->last_pkt_size,
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- dev->txbuf, NULL, NULL, NULL);
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- if (st != GRUB_EFI_SUCCESS)
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- return grub_error (GRUB_ERR_IO,
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- N_("couldn't send network packet"));
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- }
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if (limit_time < grub_get_time_ms ())
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return grub_error (GRUB_ERR_TIMEOUT,
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N_("couldn't send network packet"));
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@@ -84,8 +84,9 @@ send_card_buffer (struct grub_net_card *dev,
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we run in the GRUB_ERR_TIMEOUT case above.
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Perhaps a timeout in the FW has discarded the recycle buffer.
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*/
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+ txbuf = NULL;
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st = efi_call_3 (net->get_status, net, 0, &txbuf);
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- dev->txbusy = !(st == GRUB_EFI_SUCCESS && txbuf == dev->txbuf);
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+ dev->txbusy = !(st == GRUB_EFI_SUCCESS && txbuf);
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return GRUB_ERR_NONE;
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}
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--
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2.4.3
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