[PATCH v3 01/12] net: introduce alternative implementation as net-lwip/

Jerome Forissier jerome.forissier at linaro.org
Thu Jun 6 15:35:56 CEST 2024


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 is not compatible with NET_LWIP because it depends
on net_loop(), tftp_timeout_ms, tftp_timeout_count_max. Let's add a
dependency of DFU_OVER_TFTP on !NET_LWIP for now.

Signed-off-by: Jerome Forissier <jerome.forissier at linaro.org>
---
 Kconfig                    | 40 ++++++++++++++++++++++++++++++++++++++
 Makefile                   |  2 +-
 common/Kconfig             |  2 +-
 common/spl/Kconfig         |  1 +
 drivers/dfu/Kconfig        |  2 +-
 drivers/fastboot/Kconfig   |  4 ++--
 drivers/net/phy/Kconfig    |  2 +-
 drivers/usb/gadget/Kconfig |  2 +-
 net-lwip/Kconfig           | 37 +++++++++++++++++++++++++++++++++++
 net/Kconfig                | 14 -------------
 10 files changed, 85 insertions(+), 21 deletions(-)
 create mode 100644 net-lwip/Kconfig

diff --git a/Kconfig b/Kconfig
index 82df59f176e..b7304bd37c5 100644
--- a/Kconfig
+++ b/Kconfig
@@ -745,7 +745,47 @@ source "dts/Kconfig"
 
 source "env/Kconfig"
 
+choice
+	prompt "Networking stack"
+	default NET
+
+config NO_NET
+	bool "No networking support"
+
+config NET
+	bool "Legacy U-Boot networking stack"
+	imply NETDEVICES
+
+config NET_LWIP
+	bool "Use lwIP for networking stack"
+	imply NETDEVICES
+	help
+	  Include networking support based on the lwIP (lightweight IP)
+	  TCP/IP stack (https://nongnu.org/lwip). This is a replacement for
+	  the default U-Boot network stack and applications located in net/
+	  and enabled via CONFIG_NET as well as other pieces of code that
+	  depend on CONFIG_NET (such as cmd/net.c enabled via CONFIG_CMD_NET).
+	  Therefore the two symbols CONFIG_NET and CONFIG_NET_LWIP are mutually
+	  exclusive.
+
+endchoice
+
+if NET
 source "net/Kconfig"
+endif
+
+if NET_LWIP
+source "net-lwip/Kconfig"
+endif
+
+config SYS_RX_ETH_BUFFER
+	int "Number of receive packet buffers"
+	default 4
+	help
+	  Defines the number of Ethernet receive buffers. On some Ethernet
+	  controllers it is recommended to set this value to 8 or even higher,
+	  since all buffers can be full shortly after enabling the interface on
+	  high Ethernet traffic.
 
 source "drivers/Kconfig"
 
diff --git a/Makefile b/Makefile
index f8206b2e30a..ceb99a2698e 100644
--- a/Makefile
+++ b/Makefile
@@ -859,7 +859,7 @@ libs-$(CONFIG_OF_EMBED) += dts/
 libs-y += env/
 libs-y += lib/
 libs-y += fs/
-libs-y += net/
+libs-$(CONFIG_NET) += net/
 libs-y += disk/
 libs-y += drivers/
 libs-$(CONFIG_SYS_FSL_DDR) += drivers/ddr/fsl/
diff --git a/common/Kconfig b/common/Kconfig
index 5e3070e9253..807b726384d 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -424,7 +424,7 @@ config LOGF_FUNC_PAD
 
 config LOG_SYSLOG
 	bool "Log output to syslog server"
-	depends on NET
+	depends on NET || NET_LWIP
 	help
 	  Enables a log driver which broadcasts log records via UDP port 514
 	  to syslog servers.
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 6405374bcc1..f67f0a859db 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -1055,6 +1055,7 @@ config SPL_DM_SPI_FLASH
 
 config SPL_NET
 	bool "Support networking"
+	depends on !NET_LWIP
 	help
 	  Enable support for network devices (such as Ethernet) in SPL.
 	  This permits SPL to load U-Boot over a network link rather than
diff --git a/drivers/dfu/Kconfig b/drivers/dfu/Kconfig
index 0360d9da142..c6bce82eb10 100644
--- a/drivers/dfu/Kconfig
+++ b/drivers/dfu/Kconfig
@@ -11,7 +11,7 @@ config DFU_OVER_USB
 
 config DFU_OVER_TFTP
 	bool
-	depends on NET
+	depends on NET && !NET_LWIP
 
 if DFU
 config DFU_WRITE_ALT
diff --git a/drivers/fastboot/Kconfig b/drivers/fastboot/Kconfig
index 70207573de2..05e988166fb 100644
--- a/drivers/fastboot/Kconfig
+++ b/drivers/fastboot/Kconfig
@@ -27,7 +27,7 @@ config USB_FUNCTION_FASTBOOT
 	  This enables the USB part of the fastboot gadget.
 
 config UDP_FUNCTION_FASTBOOT
-	depends on NET
+	depends on NET || NET_LWIP
 	select FASTBOOT
 	bool "Enable fastboot protocol over UDP"
 	help
@@ -41,7 +41,7 @@ config UDP_FUNCTION_FASTBOOT_PORT
 	  The fastboot protocol requires a UDP port number.
 
 config TCP_FUNCTION_FASTBOOT
-	depends on NET
+	depends on NET || NET_LWIP
 	select FASTBOOT
 	bool "Enable fastboot protocol over TCP"
 	help
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 3d96938eaba..738752d29c2 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -11,7 +11,7 @@ config MV88E6352_SWITCH
 
 menuconfig PHYLIB
 	bool "Ethernet PHY (physical media interface) support"
-	depends on NET
+	depends on NET || NET_LWIP
 	help
 	  Enable Ethernet PHY (physical media interface) support.
 
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 4621a6fd5e6..03fe3bca197 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -224,7 +224,7 @@ endif # USB_GADGET_DOWNLOAD
 
 config USB_ETHER
 	bool "USB Ethernet Gadget"
-	depends on NET
+	depends on NET || NET_LWIP
 	default y if ARCH_SUNXI && USB_MUSB_GADGET
 	help
 	  Creates an Ethernet network device through a USB peripheral
diff --git a/net-lwip/Kconfig b/net-lwip/Kconfig
new file mode 100644
index 00000000000..a0938964b51
--- /dev/null
+++ b/net-lwip/Kconfig
@@ -0,0 +1,37 @@
+#
+# Network configuration (with lwIP stack)
+#
+
+config LWIP_DEBUG
+	bool "Enable debug traces in the lwIP library"
+
+config LWIP_ASSERT
+	bool "Enable assertions in the lwIP library"
+
+config PROT_DHCP_LWIP
+	bool "DHCP support in lwIP"
+	depends on PROT_UDP_LWIP
+	help
+	  Enable support for the DHCP protocol in lwIP.
+
+config PROT_DNS_LWIP
+	bool
+	depends on PROT_UDP_LWIP
+
+config PROT_RAW_LWIP
+	bool
+
+config PROT_TCP_LWIP
+	bool
+
+config PROT_UDP_LWIP
+	bool
+
+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 boot
+          an operating system over the network, using the PXE (Preboot
+          Execution Environment) protocol.
diff --git a/net/Kconfig b/net/Kconfig
index 5dff6336293..4929428d2a5 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -2,11 +2,6 @@
 # Network configuration
 #
 
-menuconfig NET
-	bool "Networking support"
-	default y
-	imply NETDEVICES
-
 if NET
 
 config ARP_TIMEOUT
@@ -254,12 +249,3 @@ config IPV6
 	  address and find it, it will force using IPv6 in the network stack.
 
 endif   # if NET
-
-config SYS_RX_ETH_BUFFER
-	int "Number of receive packet buffers"
-	default 4
-	help
-	  Defines the number of Ethernet receive buffers. On some Ethernet
-	  controllers it is recommended to set this value to 8 or even higher,
-	  since all buffers can be full shortly after enabling the interface on
-	  high Ethernet traffic.
-- 
2.40.1



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