On 01/29/2018 06:30 PM, Duncan Hare wrote:
The patch is trying to put everything into net.c. This is a mess and not where we should head to.
Not at all. I tried that and it was correctly rejected. The TCP functions are in tcp.c, and the wget functions in wget.c
There is no socket. There is no socket analogue. There is no widespread correct re-ordering of packets, because in a kernel download the relative address of each block is derived for the tcp sequence number, and the kernel image in memory itself is in the correct order, as defined by tcp sequence number.
You wouldn't implement a TCP protocol that cannot be reused to implement other higher protocols?
TCP packets are not expected to arrive in sequence. And the length of packets may vary. You need a buffer for a few packets to put them into the right sequence again.
We should have have one driver per protocol.
The IP driver should enumerate all drivers protocols like TCP and UDP that want to listen to it using a Linux list. This way we get rid of all those needless #ifdef CONFIGs. Using the list the IP driver will hand out packets to the respective higher protocol driver.
The choice was to make minimal changes to the current net.c, in consultation with other in the u-boot realm.
A separate driver shall implement the TCP protocol and provide methods to open a socket, to read and write to the socket and to close the socket.
"shall"? Please do not use the imperative, unless you are approaching me with money.
Next we want a driver for the HTTP protocol. It should have function to open a connection, to send a request, to receive a response, and to close the connection. If this driver is requested to open a connection it shall call the TCP driver to open a socket. It will then receive all packets from the relevant IP address on the relevant port until it closes the socket.
The http protocol is very simple, and consists of a TCP connection and a header, both for request and response.
For first use implementing GET is sufficient. But the structure of the driver should allow to easily add POST and CONNECT.
The wget command should be in a separate file. It will call the appropriate functions of the HTTP driver to open a connection, post the request, receive the response, and finally close the connection.
It is and it does. It also include the http headers, becâ€ause of their simplicity.
The work should start with refactoring the existing coding into separate drivers for the existing protocols. When that is completed you can start adding TCP relevant code.
Will you pay for that work?
The only thing that needs to be factored out of net.c is the IP protocol.
Please, do not send single patches but complete patch series.
I do the best I can with my limited knowledge of the tools. I have sent a series. My understand of both git and patman is limited.
This is how I send a patch series:
git format-patch HEAD~5 -ns --cover-letter --subject-prefix='PATCH v5'
Edit the cover letter. Add in each patch after the first --- the changes relative to the prior version of the patch. Add another ---.
Put only these files into a directory (let's assume it is named 'patches').
git send-email \ --from="author author@example.com" \ --to="maintainer <mantainer@example.com" \ --cc="interested interested@example.com" \ --cc=u-boot@lists.denx.de \ patches*
Best regards
Heinrich
Best regards
Heinrich
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