Add a bootdev driver for Ethernet. It can use the PXE boot mechanism to locate a file, added later.
Signed-off-by: Simon Glass sjg@chromium.org ---
(no changes since v1)
MAINTAINERS | 1 + net/Kconfig | 9 +++++ net/Makefile | 1 + net/eth-uclass.c | 8 ++++ net/eth_bootdev.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 120 insertions(+) create mode 100644 net/eth_bootdev.c
diff --git a/MAINTAINERS b/MAINTAINERS index 239fa2eeb75..77a34082249 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -707,6 +707,7 @@ F: include/bootdev.h F: include/bootflow.h F: include/bootmeth.h F: include/bootstd.h +F: net/eth_bootdevice.c
BTRFS M: Marek Behun marek.behun@nic.cz diff --git a/net/Kconfig b/net/Kconfig index ef0aa161f73..964a4fe4999 100644 --- a/net/Kconfig +++ b/net/Kconfig @@ -25,6 +25,15 @@ config PROT_UDP Enable a generic udp framework that allows defining a custom handler for udp protocol.
+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 operationg system over the network, using the PXE (Preboot + Execution Environment) protocol. + config BOOTP_SEND_HOSTNAME bool "Send hostname to DNS server" help diff --git a/net/Makefile b/net/Makefile index fb3eba840ff..6c812502d3e 100644 --- a/net/Makefile +++ b/net/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_CMD_DNS) += dns.o obj-$(CONFIG_DM_DSA) += dsa-uclass.o ifdef CONFIG_DM_ETH obj-$(CONFIG_NET) += eth-uclass.o +obj-$(CONFIG_$(SPL_TPL_)BOOTDEV_ETH) += eth_bootdev.o else obj-$(CONFIG_NET) += eth_legacy.o endif diff --git a/net/eth-uclass.c b/net/eth-uclass.c index 58c308f3327..bcefc54ded8 100644 --- a/net/eth-uclass.c +++ b/net/eth-uclass.c @@ -8,6 +8,7 @@ #define LOG_CATEGORY UCLASS_ETH
#include <common.h> +#include <bootdev.h> #include <bootstage.h> #include <dm.h> #include <env.h> @@ -473,6 +474,8 @@ int eth_initialize(void)
static int eth_post_bind(struct udevice *dev) { + int ret; + if (strchr(dev->name, ' ')) { printf("\nError: eth device name "%s" has a space!\n", dev->name); @@ -482,6 +485,11 @@ static int eth_post_bind(struct udevice *dev) #ifdef CONFIG_DM_ETH_PHY eth_phy_binds_nodes(dev); #endif + if (CONFIG_IS_ENABLED(BOOTDEV_ETH)) { + ret = bootdev_setup_for_dev(dev, "eth_bootdev"); + if (ret) + return log_msg_ret("bootdev", ret); + }
return 0; } diff --git a/net/eth_bootdev.c b/net/eth_bootdev.c new file mode 100644 index 00000000000..b735966d2bc --- /dev/null +++ b/net/eth_bootdev.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Bootdevice for ethernet (uses PXE) + * + * Copyright 2021 Google LLC + * Written by Simon Glass sjg@chromium.org + */ + +#include <common.h> +#include <bootdev.h> +#include <bootflow.h> +#include <command.h> +#include <bootmeth.h> +#include <distro.h> +#include <dm.h> +#include <log.h> +#include <net.h> + +static int eth_get_bootflow(struct udevice *dev, struct bootflow_iter *iter, + struct bootflow *bflow) +{ + char name[60]; + int ret; + + /* Must be an Ethernet device */ + ret = bootflow_iter_uses_network(iter); + if (ret) + return log_msg_ret("net", ret); + + ret = bootmeth_check(bflow->method, iter); + if (ret) + return log_msg_ret("check", ret); + + /* + * Like distro boot, this assumes there is only one Ethernet device. + * In this case, that means that @eth is ignored + */ + + snprintf(name, sizeof(name), "%s.%d", dev->name, iter->part); + bflow->name = strdup(name); + if (!bflow->name) + return log_msg_ret("name", -ENOMEM); + + /* + * There is not a direct interface to the network stack so run + * everything through the command-line interpreter for now. + * + * Don't bother checking the result of dhcp. It can fail with: + * + * DHCP client bound to address 192.168.4.50 (4 ms) + * *** Warning: no boot file name; using 'C0A80432.img' + * Using smsc95xx_eth device + * TFTP from server 192.168.4.1; our IP address is 192.168.4.50 + * Filename 'C0A80432.img'. + * Load address: 0x200000 + * Loading: * + * TFTP error: 'File not found' (1) + * + * This is not a real failure, since we don't actually care if the + * boot file exists. + */ + log_debug("running dhcp\n"); + run_command("dhcp", 0); + bflow->state = BOOTFLOWST_MEDIA; + + /* See distro_pxe_read_bootflow() for the standard impl of this */ + log_debug("dhcp complete - reading bootflow with method %s\n", + bflow->method->name); + ret = bootmeth_read_bootflow(bflow->method, bflow); + log_debug("reading bootflow returned %d\n", ret); + if (ret) + return log_msg_ret("method", ret); + + return 0; +} + +static int eth_bootdev_bind(struct udevice *dev) +{ + struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev); + + ucp->prio = BOOTDEVP_4_NET_BASE; + + return 0; +} + +struct bootdev_ops eth_bootdev_ops = { + .get_bootflow = eth_get_bootflow, +}; + +static const struct udevice_id eth_bootdev_ids[] = { + { .compatible = "u-boot,bootdev-eth" }, + { } +}; + +U_BOOT_DRIVER(eth_bootdev) = { + .name = "eth_bootdev", + .id = UCLASS_BOOTDEV, + .ops = ð_bootdev_ops, + .bind = eth_bootdev_bind, + .of_match = eth_bootdev_ids, +};