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authorJoe Hershberger <joe.hershberger@ni.com>2015-03-22 17:09:23 -0500
committerSimon Glass <sjg@chromium.org>2015-04-18 11:11:14 -0600
commit22f68524f84c3a0d620e787c51d5f244ef8e0aca (patch)
treeeac8ed04673bcc41b6f9f2c9771c38b38961b2b5 /board/sandbox
parentf3e0c3744a6a0a01fcf3a34b582c2f9c84ba56cd (diff)
sandbox: eth: Add support for using the 'lo' interface
The 'lo' interface on Linux doesn't support thinks like ARP or link-layer access like we use to talk to a normal network interface. A higher-level network API must be used to access localhost. As written, this interface is limited to not supporting ICMP since the API doesn't allow the socket to be opened for all IP traffic and be able to receive at the same time. UDP is far more useful to test with, so it was selected over ICMP. Ping won't work, but things like TFTP should work. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'board/sandbox')
-rw-r--r--board/sandbox/README.sandbox22
1 files changed, 22 insertions, 0 deletions
diff --git a/board/sandbox/README.sandbox b/board/sandbox/README.sandbox
index 9f5d3f71d5f..08489e38807 100644
--- a/board/sandbox/README.sandbox
+++ b/board/sandbox/README.sandbox
@@ -241,6 +241,28 @@ dhcp
set serverip WWW.XXX.YYY.ZZZ
tftpboot u-boot.bin
+The bridge also support (to a lesser extent) the localhost inderface, 'lo'.
+
+The 'lo' interface cannot use the RAW AF_PACKET API because the lo interface
+doesn't support Ethernet-level traffic. It is a higher-level interface that is
+expected only to be used at the AF_INET level of the API. As such, the most raw
+we can get on that interface is the RAW AF_INET API on UDP. This allows us to
+set the IP_HDRINCL option to include everything except the Ethernet header in
+the packets we send and receive.
+
+Because only UDP is supported, ICMP traffic will not work, so expect that ping
+commands will time out.
+
+The default device tree for sandbox includes an entry for lo on the sandbox
+host machine whose alias is "eth5". The following is an example of a network
+operation being tested on the lo interface.
+
+TFTP
+....
+
+set ethact eth5
+tftpboot u-boot.bin
+
SPI Emulation
-------------