On Sat, Jun 22, 2019 at 1:53 PM Ramon Fried rfried.dev@gmail.com wrote:
Add documentation for new "pcap" command.
Signed-off-by: Ramon Fried rfried.dev@gmail.com
v2: remove duplicated lines from example doc/README.pcap | 61 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 doc/README.pcap
diff --git a/doc/README.pcap b/doc/README.pcap new file mode 100644 index 0000000000..25c85ae271 --- /dev/null +++ b/doc/README.pcap @@ -0,0 +1,61 @@ +PCAP:
+U-boot supports live ethernet packet capture in PCAP(2.4) format. +This is enabled by CONFIG_CMD_PCAP.
+The capture is stored on physical memory, and should be copied to +a machine capabale of parsing and displaying PCAP files (IE. wireshark) +If networking works properly one can copy the capture file from physical memory +using tftpput, or save it to local storage with (sf write, mmc write, fatwrite, etc)
+the pcap capturing requires maximum buffer size. +when the buffer is full, packets will silently drop. +check the status using "pcap status" to see if the buffer is full, +if so, consider increasing the buffer size.
Based on the change I asked for in the other patch, please reword this to match the behavior.
+Usage example:
+# pcap init 0x100000 100000 +PCAP capture initialized: addr: 0xffffffff80100000 max length: 100000
+# pcap start +# env set ipaddr 10.0.2.15; env set serverip 10.0.2.2; tftp uImage64 +eth0@10000000: PHY present at 0 +eth0@10000000: link up, 1000Mbps full-duplex (lpa: 0x7c00) +Using eth0@10000000 device +TFTP from server 10.0.2.2; our IP address is 10.0.2.15 +Filename 'uImage64'. +Load address: 0xffffffff88000000 +Loading: #################################################################
#########################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################################18.2 MiB/s+done +Bytes transferred = 8359376 (7f8dd0 hex) +PCAP status:
Initialized addr: 0xffffffff80100000 max length: 100000Status: Active. file size: 99991Incoming packets: 66 Outgoing packets: 67!!! Buffer is full, consider increasing buffer size !!!+# pcap stop +# tftpput 0xffffffff80100000 100000 10.0.2.2:capture.pcap
-- 2.22.0
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