grub2/0135-efinet-retransmit-if-our-device-is-busy.patch

49 lines
1.7 KiB
Diff

From 0fd33baa9fa8db6b8868a9691dc08a683bade47b Mon Sep 17 00:00:00 2001
From: Josef Bacik <jbacik@fb.com>
Date: Mon, 31 Aug 2015 13:34:35 -0400
Subject: [PATCH 135/194] efinet: retransmit if our device is busy
When I fixed the txbuf handling I ripped out the retransmission code since it
was flooding our network when we had the buggy behavior. Turns out this was too
heavy handed as we can still have transient tx timeouts. So instead make sure
we retry our transmission once per timeout. This way we can deal with transient
transmission problems without flooding the box. This fixes an issue we were
seeing in production. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
---
grub-core/net/drivers/efi/efinet.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/grub-core/net/drivers/efi/efinet.c b/grub-core/net/drivers/efi/efinet.c
index 5388f952b..3f112438a 100644
--- a/grub-core/net/drivers/efi/efinet.c
+++ b/grub-core/net/drivers/efi/efinet.c
@@ -38,6 +38,7 @@ send_card_buffer (struct grub_net_card *dev,
grub_efi_simple_network_t *net = dev->efi_net;
grub_uint64_t limit_time = grub_get_time_ms () + 4000;
void *txbuf;
+ int retry = 0;
if (dev->txbusy)
while (1)
@@ -60,6 +61,15 @@ send_card_buffer (struct grub_net_card *dev,
dev->txbusy = 0;
break;
}
+ if (!retry)
+ {
+ st = efi_call_7 (net->transmit, net, 0, dev->last_pkt_size,
+ dev->txbuf, NULL, NULL, NULL);
+ if (st != GRUB_EFI_SUCCESS)
+ return grub_error (GRUB_ERR_IO,
+ N_("couldn't send network packet"));
+ retry = 1;
+ }
if (limit_time < grub_get_time_ms ())
return grub_error (GRUB_ERR_TIMEOUT,
N_("couldn't send network packet"));
--
2.13.5