|
 |
8631a2 |
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
|
8631a2 |
From: Josef Bacik <jbacik@fb.com>
|
|
|
8631a2 |
Date: Wed, 12 Aug 2015 08:57:55 -0700
|
|
|
8631a2 |
Subject: [PATCH] tcp: add window scaling support
|
|
|
8631a2 |
|
|
|
8631a2 |
Sometimes we have to provision boxes across regions, such as California to
|
|
|
8631a2 |
Sweden. The http server has a 10 minute timeout, so if we can't get our 250mb
|
|
|
8631a2 |
image transferred fast enough our provisioning fails, which is not ideal. So
|
|
|
8631a2 |
add tcp window scaling on open connections and set the window size to 1mb. With
|
|
|
8631a2 |
this change we're able to get higher sustained transfers between regions and can
|
|
|
8631a2 |
transfer our image in well below 10 minutes. Without this patch we'd time out
|
|
|
8631a2 |
every time halfway through the transfer. Thanks,
|
|
|
8631a2 |
|
|
|
8631a2 |
Signed-off-by: Josef Bacik <jbacik@fb.com>
|
|
|
8631a2 |
---
|
|
|
8631a2 |
grub-core/net/tcp.c | 42 +++++++++++++++++++++++++++++-------------
|
|
|
8631a2 |
1 file changed, 29 insertions(+), 13 deletions(-)
|
|
|
8631a2 |
|
|
|
8631a2 |
diff --git a/grub-core/net/tcp.c b/grub-core/net/tcp.c
|
|
|
b32e65 |
index e8ad34b84..7d4b82262 100644
|
|
|
8631a2 |
--- a/grub-core/net/tcp.c
|
|
|
8631a2 |
+++ b/grub-core/net/tcp.c
|
|
|
8631a2 |
@@ -106,6 +106,18 @@ struct tcphdr
|
|
|
8631a2 |
grub_uint16_t urgent;
|
|
|
8631a2 |
} GRUB_PACKED;
|
|
|
8631a2 |
|
|
|
8631a2 |
+struct tcp_scale_opt {
|
|
|
8631a2 |
+ grub_uint8_t kind;
|
|
|
8631a2 |
+ grub_uint8_t length;
|
|
|
8631a2 |
+ grub_uint8_t scale;
|
|
|
8631a2 |
+} GRUB_PACKED;
|
|
|
8631a2 |
+
|
|
|
8631a2 |
+struct tcp_synhdr {
|
|
|
8631a2 |
+ struct tcphdr tcphdr;
|
|
|
8631a2 |
+ struct tcp_scale_opt scale_opt;
|
|
|
8631a2 |
+ grub_uint8_t padding;
|
|
|
8631a2 |
+};
|
|
|
8631a2 |
+
|
|
|
8631a2 |
struct tcp_pseudohdr
|
|
|
8631a2 |
{
|
|
|
8631a2 |
grub_uint32_t src;
|
|
|
8631a2 |
@@ -566,7 +578,7 @@ grub_net_tcp_open (char *server,
|
|
|
8631a2 |
grub_net_tcp_socket_t socket;
|
|
|
8631a2 |
static grub_uint16_t in_port = 21550;
|
|
|
8631a2 |
struct grub_net_buff *nb;
|
|
|
8631a2 |
- struct tcphdr *tcph;
|
|
|
8631a2 |
+ struct tcp_synhdr *tcph;
|
|
|
8631a2 |
int i;
|
|
|
8631a2 |
grub_uint8_t *nbd;
|
|
|
8631a2 |
grub_net_link_level_address_t ll_target_addr;
|
|
|
8631a2 |
@@ -635,20 +647,24 @@ grub_net_tcp_open (char *server,
|
|
|
8631a2 |
}
|
|
|
8631a2 |
|
|
|
8631a2 |
tcph = (void *) nb->data;
|
|
|
8631a2 |
+ grub_memset(tcph, 0, sizeof (*tcph));
|
|
|
8631a2 |
socket->my_start_seq = grub_get_time_ms ();
|
|
|
8631a2 |
socket->my_cur_seq = socket->my_start_seq + 1;
|
|
|
8631a2 |
- socket->my_window = 8192;
|
|
|
8631a2 |
- tcph->seqnr = grub_cpu_to_be32 (socket->my_start_seq);
|
|
|
8631a2 |
- tcph->ack = grub_cpu_to_be32_compile_time (0);
|
|
|
8631a2 |
- tcph->flags = grub_cpu_to_be16_compile_time ((5 << 12) | TCP_SYN);
|
|
|
8631a2 |
- tcph->window = grub_cpu_to_be16 (socket->my_window);
|
|
|
8631a2 |
- tcph->urgent = 0;
|
|
|
8631a2 |
- tcph->src = grub_cpu_to_be16 (socket->in_port);
|
|
|
8631a2 |
- tcph->dst = grub_cpu_to_be16 (socket->out_port);
|
|
|
8631a2 |
- tcph->checksum = 0;
|
|
|
8631a2 |
- tcph->checksum = grub_net_ip_transport_checksum (nb, GRUB_NET_IP_TCP,
|
|
|
8631a2 |
- &socket->inf->address,
|
|
|
8631a2 |
- &socket->out_nla);
|
|
|
8631a2 |
+ socket->my_window = 32768;
|
|
|
8631a2 |
+ tcph->tcphdr.seqnr = grub_cpu_to_be32 (socket->my_start_seq);
|
|
|
8631a2 |
+ tcph->tcphdr.ack = grub_cpu_to_be32_compile_time (0);
|
|
|
8631a2 |
+ tcph->tcphdr.flags = grub_cpu_to_be16_compile_time ((6 << 12) | TCP_SYN);
|
|
|
8631a2 |
+ tcph->tcphdr.window = grub_cpu_to_be16 (socket->my_window);
|
|
|
8631a2 |
+ tcph->tcphdr.urgent = 0;
|
|
|
8631a2 |
+ tcph->tcphdr.src = grub_cpu_to_be16 (socket->in_port);
|
|
|
8631a2 |
+ tcph->tcphdr.dst = grub_cpu_to_be16 (socket->out_port);
|
|
|
8631a2 |
+ tcph->tcphdr.checksum = 0;
|
|
|
8631a2 |
+ tcph->scale_opt.kind = 3;
|
|
|
8631a2 |
+ tcph->scale_opt.length = 3;
|
|
|
8631a2 |
+ tcph->scale_opt.scale = 5;
|
|
|
8631a2 |
+ tcph->tcphdr.checksum = grub_net_ip_transport_checksum (nb, GRUB_NET_IP_TCP,
|
|
|
8631a2 |
+ &socket->inf->address,
|
|
|
8631a2 |
+ &socket->out_nla);
|
|
|
8631a2 |
|
|
|
8631a2 |
tcp_socket_register (socket);
|
|
|
8631a2 |
|