On Thu, Jul 25, 2024 at 02:57:23PM +0200, Jerome Forissier wrote:
Prepare the introduction of the lwIP (lightweight IP) TCP/IP stack by adding a new net/lwip/ directory and the NET_LWIP symbol. Network support is either NO_NET, NET (legacy stack) or NET_LWIP. Subsequent commits will introduce the lwIP code, re-work the NETDEVICE integration and port some of the NET commands and features to lwIP.
SPL_NET cannot be enabled when NET_LWIP=y. SPL_NET pulls some symbols that are part of NET (such as arp_init(), arp_timeout_check(), arp_receive(), net_arp_wait_packet_ip()). lwIP support in SPL may be added later.
Similarly, DFU_TFTP and FASTBOOT are not compatible with NET_LWIP because of dependencies on net_loop(), tftp_timeout_ms, tftp_timeout_count_max and other NET things. Let's add a dependency on !NET_LWIP for now.
As for SANDBOX, NET_LWIP cannot be used either because of strong assumptions on the network stack. Make NET_LWIP depend on !SANDBOX so that the NET_LWIP alternative is not visible in make menuconfig when sandbox_defconfig is used.
Signed-off-by: Jerome Forissier jerome.forissier@linaro.org
[snip]
Here in net/Kconfig you do..
+if NET || NET_LWIP
+config BOOTDEV_ETH
- bool "Enable bootdev for ethernet"
- depends on BOOTSTD
- default y
- help
Provide a bootdev for ethernet so that is it possible to bootan operating system over the network, using the PXE (PrebootExecution Environment) protocol.config SYS_RX_ETH_BUFFER int "Number of receive packet buffers" default 4
But we must have SYS_RX_ETH_BUFFER defined even in the NO_NET case as otherwise previously <net.h> and now <net-common.h> cannot be used, and untying that is another big mess. We include <net.h> in common areas for function prototypes where their usage is guarded. But we use PKTBUFSRX in some structs that aren't guarded. Trying to build for example for am62x_beagleplay_r5 with this series blows up in a lot of places.