[PATCHv6 04/14] net/lwip: implement dhcp cmd

[Tom Rini]

On Thu, Aug 17, 2023 at 08:55:17PM +0600, Maxim Uvarov wrote:
> On Thu, 17 Aug 2023 at 20:04, Peter Robinson <pbrobinson at gmail.com> wrote:
> 
> > On Thu, Aug 17, 2023 at 2:46 PM Maxim Uvarov <maxim.uvarov at linaro.org>
> > wrote:
> > >
> > > On Mon, 14 Aug 2023 at 21:29, Tom Rini <trini at konsulko.com> wrote:
> > >
> > > > On Mon, Aug 14, 2023 at 09:18:19PM +0600, Maxim Uvarov wrote:
> > > > > On Mon, 14 Aug 2023 at 20:21, Ilias Apalodimas <
> > > > ilias.apalodimas at linaro.org>
> > > > > wrote:
> > > > >
> > > > > > On Mon, Aug 14, 2023 at 07:32:43PM +0600, Maxim Uvarov wrote:
> > > > > > > Implement function for dhcp command with lwIP variant. Usage and
> > > > output
> > > > > > is
> > > > > > > the same as the original command. This code called by
> > compatibility
> > > > code
> > > > > > > between U-Boot and lwIP.
> > > > > >
> > > > > > Same as the dns command
> > > > > >
> > > > > > >
> > > > > > > Signed-off-by: Maxim Uvarov <maxim.uvarov at linaro.org>
> > > > > > > ---
> > > > > > >  include/net/lwip.h             | 10 +++++++
> > > > > > >  net/lwip/Makefile              |  1 +
> > > > > > >  net/lwip/apps/dhcp/lwip-dhcp.c | 51
> > > > ++++++++++++++++++++++++++++++++++
> > > > > > >  3 files changed, 62 insertions(+)
> > > > > > >  create mode 100644 net/lwip/apps/dhcp/lwip-dhcp.c
> > > > > > >
> > > > > > > diff --git a/include/net/lwip.h b/include/net/lwip.h
> > > > > > > index c83b5c8231..2f035280eb 100644
> > > > > > > --- a/include/net/lwip.h
> > > > > > > +++ b/include/net/lwip.h
> > > > > > > @@ -15,3 +15,13 @@ int do_lwip_dns(struct cmd_tbl *cmdtp, int
> > flag,
> > > > int
> > > > > > argc,
> > > > > > >  *         Other value < 0, if error
> > > > > > >  */
> > > > > > >  int ulwip_dns(char *name, char *varname);
> > > > > > > +
> > > > > > > +/*
> > > > > > > +* This function creates the DHCP request to obtain IP address.
> > If
> > > > DHCP
> > > > > > server
> > > > > >
> > > > > > Sphinx needs something more, please check the existing functions
> > > > > >
> > > > > > > +* returns file name, this file will be downloaded with tftp.
> > After
> > > > this
> > > > > > > +* function you need to invoke the polling loop to process
> > network
> > > > > > communication.
> > > > > > > +*
> > > > > > > +* Return: 0 if success
> > > > > > > +*         Other value < 0, if error
> > > > > > > +*/
> > > > > > > +int ulwip_dhcp(void);
> > > > > > > diff --git a/net/lwip/Makefile b/net/lwip/Makefile
> > > > > > > index 6d2c00605b..59323fb325 100644
> > > > > > > --- a/net/lwip/Makefile
> > > > > > > +
> > > > > > > +static struct dhcp dhcp;
> > > > > > > +
> > > > > > > +static int ulwip_dhcp_tmo(void)
> > > > > > > +{
> > > > > > > +     switch (dhcp.state) {
> > > > > > > +     case DHCP_STATE_BOUND:
> > > > > > > +             env_set("bootfile", dhcp.boot_file_name);
> > > > > > > +             env_set("ipaddr",
> > ip4addr_ntoa(&dhcp.offered_ip_addr));
> > > > > > > +             env_set("netmask",
> > > > ip4addr_ntoa(&dhcp.offered_sn_mask));
> > > > > > > +             env_set("serverip",
> > > > ip4addr_ntoa(&dhcp.server_ip_addr));
> > > > > > > +             printf("DHCP client bound to address %s\n",
> > > > > > ip4addr_ntoa(&dhcp.offered_ip_addr));
> > > > > > > +             break;
> > > > > > > +     default:
> > > > > > > +             return -1;
> > > > > > > +     }
> > > > > > > +
> > > > > > > +     return 0;
> > > > > > > +}
> > > > > > > +
> > > > > > > +int ulwip_dhcp(void)
> > > > > > > +{
> > > > > > > +     int err;
> > > > > > > +     struct netif *netif;
> > > > > > > +
> > > > > > > +     ulwip_set_tmo(ulwip_dhcp_tmo);
> > > > > > > +     netif = netif_get_by_index(1);
> > > > > >
> > > > > > What's (1)?
> > > > > >
> > > > > >
> > > > > Only one lwip netif is registered. 1 - here is the index of netif. I
> > > > don't
> > > > > think that there is any definition for that...
> > > > >
> > > >
> > > > And there's only ever going to be one interface (even if we have ipv4
> > > > and ipv60 ? If so, define it to something please, thanks.
> > > >
> > > > --
> > > > Tom
> > > >
> > >
> > > Yes, one interface has 2 addresses ipv4 and ipv6.
> >
> > What about a device like a router which may have multiple wired
> > ethernet interface?
> 
> Yea, looks like we need lwip netif per U-Boots eth_devs. I did not yet
> support several eth devices, but it will be good to add this to not break
> existing functionality..

The general case ends up being if we have more than one interface,
ethact is what's used.  I'm unsure off-hand if some of the fancier
networking-centric chipsets and devices have something more complex
setup in their stacks.

-- 
Tom
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