Blame SOURCES/0181-tcp-ack-when-we-get-an-OOO-lost-packet.patch
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Josef Bacik <jbacik@fb.com>
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Date: Wed, 12 Aug 2015 08:16:22 -0700
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Subject: [PATCH] tcp: ack when we get an OOO/lost packet
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While adding tcp window scaling support I was finding that I'd get some packet
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loss or reordering when transferring from large distances and grub would just
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timeout. This is because we weren't ack'ing when we got our OOO packet, so the
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sender didn't know it needed to retransmit anything, so eventually it would fill
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the window and stop transmitting, and we'd time out. Fix this by ACK'ing when
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we don't find our next sequence numbered packet. With this fix I no longer time
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out. Thanks,
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Signed-off-by: Josef Bacik <jbacik@fb.com>
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---
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grub-core/net/tcp.c | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/grub-core/net/tcp.c b/grub-core/net/tcp.c
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index 2077f5519b2..fa29a2afc6c 100644
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--- a/grub-core/net/tcp.c
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+++ b/grub-core/net/tcp.c
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@@ -882,7 +882,10 @@ grub_net_recv_tcp_packet (struct grub_net_buff *nb,
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grub_priority_queue_pop (sock->pq);
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}
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if (grub_be_to_cpu32 (tcph->seqnr) != sock->their_cur_seq)
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- return GRUB_ERR_NONE;
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+ {
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+ ack (sock);
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+ return GRUB_ERR_NONE;
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+ }
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while (1)
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{
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nb_top_p = grub_priority_queue_top (sock->pq);
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