[U-Boot] [PATCH v3 1/7] efi_loader: Add network access support
Alexander Graf
agraf at suse.de
Mon May 16 20:06:58 CEST 2016
On 16.05.16 15:24, Simon Glass wrote:
> Hi Alexander,
>
> On 14 May 2016 at 14:34, Alexander Graf <agraf at suse.de> wrote:
>>
>>
>>> Am 14.05.2016 um 21:49 schrieb Simon Glass <sjg at chromium.org>:
>>>
>>> Hi Alexander,
>>>
>>>> On 10 May 2016 at 15:25, Alexander Graf <agraf at suse.de> wrote:
>>>> We can now successfully boot EFI applications from disk, but users
>>>> may want to also run them from a PXE setup.
>>>>
>>>> This patch implements rudimentary network support, allowing a payload
>>>> to send and receive network packets.
>>>>
>>>> With this patch, I was able to successfully run grub2 with network
>>>> access inside of QEMU's -M xlnx-ep108 and on a zcu102 system.
>>>>
>>>> Signed-off-by: Alexander Graf <agraf at suse.de>
>>>>
>>>> ---
>>>>
>>>> v2 -> v3:
>>>>
>>>> - Align initialization sequence with net code
>>>> - Set device to initialized after init call
>>>> - Align tx buffers to DMA alignment (rx gets memcpy'd)
>>>> - Add comment about eth_rx()
>>>> ---
>>>> cmd/bootefi.c | 7 ++
>>>> include/efi_api.h | 119 ++++++++++++++++++
>>>> include/efi_loader.h | 7 ++
>>>> include/net.h | 2 +-
>>>> lib/efi_loader/Makefile | 1 +
>>>> lib/efi_loader/efi_net.c | 314 +++++++++++++++++++++++++++++++++++++++++++++++
>>>> net/bootp.c | 2 +
>>>> net/net.c | 4 +-
>>>> net/tftp.c | 2 +
>>>> 9 files changed, 455 insertions(+), 3 deletions(-)
>>>> create mode 100644 lib/efi_loader/efi_net.c
>>>>
>>>> diff --git a/cmd/bootefi.c b/cmd/bootefi.c
>>>> index 7f552fc..d3a2331 100644
>>>> --- a/cmd/bootefi.c
>>>> +++ b/cmd/bootefi.c
>>>> @@ -197,6 +197,13 @@ static unsigned long do_bootefi_exec(void *efi, void *fdt)
>>>> #ifdef CONFIG_LCD
>>>> efi_gop_register();
>>>> #endif
>>>> +#ifdef CONFIG_NET
>>>> + void *nethandle = loaded_image_info.device_handle;
>>>> + efi_net_register(&nethandle);
>>>> +
>>>> + if (!memcmp(bootefi_device_path[0].str, "N\0e\0t", 6))
>>>> + loaded_image_info.device_handle = nethandle;
>>>> +#endif
>>>>
>>>> /* Call our payload! */
>>>> #ifdef DEBUG_EFI
>>>> diff --git a/include/efi_api.h b/include/efi_api.h
>>>> index 51d7586..20035d7 100644
>>>> --- a/include/efi_api.h
>>>> +++ b/include/efi_api.h
>>>> @@ -412,4 +412,123 @@ struct efi_gop
>>>> struct efi_gop_mode *mode;
>>>> };
>>>>
>>>> +#define EFI_SIMPLE_NETWORK_GUID \
>>>> + EFI_GUID(0xa19832b9, 0xac25, 0x11d3, \
>>>> + 0x9a, 0x2d, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d)
>>>> +
>>>> +struct efi_mac_address {
>>>> + char mac_addr[32];
>>>> +};
>>>> +
>>>> +struct efi_ip_address {
>>>> + u8 ip_addr[16];
>>>> +};
>>>> +
>>>> +enum efi_simple_network_state {
>>>> + EFI_NETWORK_STOPPED,
>>>> + EFI_NETWORK_STARTED,
>>>> + EFI_NETWORK_INITIALIZED,
>>>> +};
>>>> +
>>>> +struct efi_simple_network_mode {
>>>> + enum efi_simple_network_state state;
>>>> + u32 hwaddr_size;
>>>> + u32 media_header_size;
>>>> + u32 max_packet_size;
>>>> + u32 nvram_size;
>>>> + u32 nvram_access_size;
>>>> + u32 receive_filter_mask;
>>>> + u32 receive_filter_setting;
>>>> + u32 max_mcast_filter_count;
>>>> + u32 mcast_filter_count;
>>>> + struct efi_mac_address mcast_filter[16];
>>>> + struct efi_mac_address current_address;
>>>> + struct efi_mac_address broadcast_address;
>>>> + struct efi_mac_address permanent_address;
>>>> + u8 if_type;
>>>> + u8 mac_changeable;
>>>> + u8 multitx_supported;
>>>> + u8 media_present_supported;
>>>> + u8 media_present;
>>>> +};
>>>> +
>>>> +#define EFI_SIMPLE_NETWORK_RECEIVE_UNICAST 0x01,
>>>> +#define EFI_SIMPLE_NETWORK_RECEIVE_MULTICAST 0x02,
>>>> +#define EFI_SIMPLE_NETWORK_RECEIVE_BROADCAST 0x04,
>>>> +#define EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS 0x08,
>>>> +#define EFI_SIMPLE_NETWORK_RECEIVE_PROMISCUOUS_MULTICAST 0x10,
>>>> +
>>>> +struct efi_simple_network
>>>> +{
>>>> + u64 revision;
>>>> + efi_status_t (EFIAPI *start)(struct efi_simple_network *this);
>>>> + efi_status_t (EFIAPI *stop)(struct efi_simple_network *this);
>>>> + efi_status_t (EFIAPI *initialize)(struct efi_simple_network *this,
>>>> + ulong extra_rx, ulong extra_tx);
>>>> + efi_status_t (EFIAPI *reset)(struct efi_simple_network *this,
>>>> + int extended_verification);
>>>> + efi_status_t (EFIAPI *shutdown)(struct efi_simple_network *this);
>>>> + efi_status_t (EFIAPI *receive_filters)(struct efi_simple_network *this,
>>>> + u32 enable, u32 disable, int reset_mcast_filter,
>>>> + ulong mcast_filter_count,
>>>> + struct efi_mac_address *mcast_filter);
>>>> + efi_status_t (EFIAPI *station_address)(struct efi_simple_network *this,
>>>> + int reset, struct efi_mac_address *new_mac);
>>>> + efi_status_t (EFIAPI *statistics)(struct efi_simple_network *this,
>>>> + int reset, ulong *stat_size, void *stat_table);
>>>> + efi_status_t (EFIAPI *mcastiptomac)(struct efi_simple_network *this,
>>>> + int ipv6, struct efi_ip_address *ip,
>>>> + struct efi_mac_address *mac);
>>>> + efi_status_t (EFIAPI *nvdata)(struct efi_simple_network *this,
>>>> + int read_write, ulong offset, ulong buffer_size,
>>>> + char *buffer);
>>>> + efi_status_t (EFIAPI *get_status)(struct efi_simple_network *this,
>>>> + u32 *int_status, void **txbuf);
>>>> + efi_status_t (EFIAPI *transmit)(struct efi_simple_network *this,
>>>> + ulong header_size, ulong buffer_size, void *buffer,
>>>> + struct efi_mac_address *src_addr,
>>>> + struct efi_mac_address *dest_addr, u16 *protocol);
>>>> + efi_status_t (EFIAPI *receive)(struct efi_simple_network *this,
>>>> + ulong *header_size, ulong *buffer_size, void *buffer,
>>>> + struct efi_mac_address *src_addr,
>>>> + struct efi_mac_address *dest_addr, u16 *protocol);
>>>> + void (EFIAPI *waitforpacket)(void);
>>>> + struct efi_simple_network_mode *mode;
>>>> +};
>>>> +
>>>> +#define EFI_PXE_GUID \
>>>> + EFI_GUID(0x03c4e603, 0xac28, 0x11d3, \
>>>> + 0x9a, 0x2d, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d)
>>>> +
>>>> +struct efi_pxe_packet {
>>>> + u8 packet[1472];
>>>> +};
>>>> +
>>>> +struct efi_pxe_mode
>>>> +{
>>>> + u8 unused[52];
>>>> + struct efi_pxe_packet dhcp_discover;
>>>> + struct efi_pxe_packet dhcp_ack;
>>>> + struct efi_pxe_packet proxy_offer;
>>>> + struct efi_pxe_packet pxe_discover;
>>>> + struct efi_pxe_packet pxe_reply;
>>>> +};
>>>> +
>>>> +struct efi_pxe {
>>>> + u64 rev;
>>>> + void (EFIAPI *start)(void);
>>>> + void (EFIAPI *stop)(void);
>>>> + void (EFIAPI *dhcp)(void);
>>>> + void (EFIAPI *discover)(void);
>>>> + void (EFIAPI *mftp)(void);
>>>> + void (EFIAPI *udpwrite)(void);
>>>> + void (EFIAPI *udpread)(void);
>>>> + void (EFIAPI *setipfilter)(void);
>>>> + void (EFIAPI *arp)(void);
>>>> + void (EFIAPI *setparams)(void);
>>>> + void (EFIAPI *setstationip)(void);
>>>> + void (EFIAPI *setpackets)(void);
>>>> + struct efi_pxe_mode *mode;
>>>> +};
>>>> +
>>>> #endif
>>>> diff --git a/include/efi_loader.h b/include/efi_loader.h
>>>> index 88b8149..8005454 100644
>>>> --- a/include/efi_loader.h
>>>> +++ b/include/efi_loader.h
>>>> @@ -91,6 +91,12 @@ extern struct list_head efi_obj_list;
>>>> int efi_disk_register(void);
>>>> /* Called by bootefi to make GOP (graphical) interface available */
>>>> int efi_gop_register(void);
>>>> +/* Called by bootefi to make the network interface available */
>>>> +int efi_net_register(void **handle);
>>>> +
>>>> +/* Called by networking code to memorize the dhcp ack package */
>>>> +void efi_net_set_dhcp_ack(void *pkt, int len);
>>>> +
>>>> /*
>>>> * Stub implementation for a protocol opener that just returns the handle as
>>>> * interface
>>>> @@ -157,5 +163,6 @@ static inline void ascii2unicode(u16 *unicode, char *ascii)
>>>> static inline void efi_restore_gd(void) { }
>>>> static inline void efi_set_bootdev(const char *dev, const char *devnr,
>>>> const char *path) { }
>>>> +static inline void efi_net_set_dhcp_ack(void *pkt, int len) { }
>>>>
>>>> #endif
>>>> diff --git a/include/net.h b/include/net.h
>>>> index 05800c4..5ee5929 100644
>>>> --- a/include/net.h
>>>> +++ b/include/net.h
>>>> @@ -269,7 +269,7 @@ int eth_getenv_enetaddr_by_index(const char *base_name, int index,
>>>> int eth_init(void); /* Initialize the device */
>>>> int eth_send(void *packet, int length); /* Send a packet */
>>>>
>>>> -#ifdef CONFIG_API
>>>> +#if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
>>>> int eth_receive(void *packet, int length); /* Receive a packet*/
>>>> extern void (*push_packet)(void *packet, int length);
>>>> #endif
>>>> diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
>>>> index 83e31f6..2a3849e 100644
>>>> --- a/lib/efi_loader/Makefile
>>>> +++ b/lib/efi_loader/Makefile
>>>> @@ -11,3 +11,4 @@ obj-y += efi_image_loader.o efi_boottime.o efi_runtime.o efi_console.o
>>>> obj-y += efi_memory.o
>>>> obj-$(CONFIG_LCD) += efi_gop.o
>>>> obj-$(CONFIG_PARTITIONS) += efi_disk.o
>>>> +obj-$(CONFIG_NET) += efi_net.o
>>>> diff --git a/lib/efi_loader/efi_net.c b/lib/efi_loader/efi_net.c
>>>> new file mode 100644
>>>> index 0000000..a95ff3c
>>>> --- /dev/null
>>>> +++ b/lib/efi_loader/efi_net.c
>>>> @@ -0,0 +1,314 @@
>>>> +/*
>>>> + * EFI application network access support
>>>> + *
>>>> + * Copyright (c) 2016 Alexander Graf
>>>> + *
>>>> + * SPDX-License-Identifier: GPL-2.0+
>>>> + */
>>>> +
>>>> +#include <common.h>
>>>> +#include <efi_loader.h>
>>>> +#include <inttypes.h>
>>>> +#include <lcd.h>
>>>> +#include <malloc.h>
>>>> +
>>>> +DECLARE_GLOBAL_DATA_PTR;
>>>> +
>>>> +static const efi_guid_t efi_net_guid = EFI_SIMPLE_NETWORK_GUID;
>>>> +static const efi_guid_t efi_pxe_guid = EFI_PXE_GUID;
>>>> +static struct efi_pxe_packet *dhcp_ack;
>>>> +static bool new_rx_packet;
>>>> +static void *new_tx_packet;
>>>> +
>>>> +struct efi_net_obj {
>>>> + /* Generic EFI object parent class data */
>>>> + struct efi_object parent;
>>>> + /* EFI Interface callback struct for network */
>>>> + struct efi_simple_network net;
>>>> + struct efi_simple_network_mode net_mode;
>>>> + /* Device path to the network adapter */
>>>> + struct efi_device_path_file_path dp[2];
>>>> + /* PXE struct to transmit dhcp data */
>>>> + struct efi_pxe pxe;
>>>> + struct efi_pxe_mode pxe_mode;
>>>> +};
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_start(struct efi_simple_network *this)
>>>> +{
>>>> + EFI_ENTRY("%p", this);
>>>> +
>>>> + return EFI_EXIT(EFI_SUCCESS);
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_stop(struct efi_simple_network *this)
>>>> +{
>>>> + EFI_ENTRY("%p", this);
>>>> +
>>>> + return EFI_EXIT(EFI_SUCCESS);
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_initialize(struct efi_simple_network *this,
>>>> + ulong extra_rx, ulong extra_tx)
>>>> +{
>>>> + struct efi_net_obj *netobj = container_of(this, struct efi_net_obj, net);
>>>> + int ret;
>>>> + EFI_ENTRY("%p, %lx, %lx", this, extra_rx, extra_tx);
>>>> +
>>>> + eth_halt();
>>>> + eth_set_current();
>>>> + ret = eth_init();
>>>> + if (ret < 0) {
>>>> + eth_halt();
>>>> + return EFI_EXIT(EFI_DEVICE_ERROR);
>>>> + }
>>>> +
>>>> + netobj->net_mode.state = EFI_NETWORK_INITIALIZED;
>>>> +
>>>> + return EFI_EXIT(EFI_SUCCESS);
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_reset(struct efi_simple_network *this,
>>>> + int extended_verification)
>>>> +{
>>>> + EFI_ENTRY("%p, %x", this, extended_verification);
>>>> +
>>>> + return EFI_EXIT(EFI_SUCCESS);
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_shutdown(struct efi_simple_network *this)
>>>> +{
>>>> + EFI_ENTRY("%p", this);
>>>> +
>>>> + return EFI_EXIT(EFI_SUCCESS);
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_receive_filters(
>>>> + struct efi_simple_network *this, u32 enable, u32 disable,
>>>> + int reset_mcast_filter, ulong mcast_filter_count,
>>>> + struct efi_mac_address *mcast_filter)
>>>> +{
>>>> + EFI_ENTRY("%p, %x, %x, %x, %lx, %p", this, enable, disable,
>>>> + reset_mcast_filter, mcast_filter_count, mcast_filter);
>>>> +
>>>> + /* XXX Do we care? */
>>>> +
>>>> + return EFI_EXIT(EFI_SUCCESS);
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_station_address(
>>>> + struct efi_simple_network *this, int reset,
>>>> + struct efi_mac_address *new_mac)
>>>> +{
>>>> + EFI_ENTRY("%p, %x, %p", this, reset, new_mac);
>>>> +
>>>> + return EFI_EXIT(EFI_INVALID_PARAMETER);
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_statistics(struct efi_simple_network *this,
>>>> + int reset, ulong *stat_size,
>>>> + void *stat_table)
>>>> +{
>>>> + EFI_ENTRY("%p, %x, %p, %p", this, reset, stat_size, stat_table);
>>>> +
>>>> + return EFI_EXIT(EFI_INVALID_PARAMETER);
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_mcastiptomac(struct efi_simple_network *this,
>>>> + int ipv6,
>>>> + struct efi_ip_address *ip,
>>>> + struct efi_mac_address *mac)
>>>> +{
>>>> + EFI_ENTRY("%p, %x, %p, %p", this, ipv6, ip, mac);
>>>> +
>>>> + return EFI_EXIT(EFI_INVALID_PARAMETER);
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_nvdata(struct efi_simple_network *this,
>>>> + int read_write, ulong offset,
>>>> + ulong buffer_size, char *buffer)
>>>> +{
>>>> + EFI_ENTRY("%p, %x, %lx, %lx, %p", this, read_write, offset, buffer_size,
>>>> + buffer);
>>>> +
>>>> + return EFI_EXIT(EFI_INVALID_PARAMETER);
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_get_status(struct efi_simple_network *this,
>>>> + u32 *int_status, void **txbuf)
>>>> +{
>>>> + EFI_ENTRY("%p, %p, %p", this, int_status, txbuf);
>>>> +
>>>> + /* We send packets synchronously, so nothing is outstanding */
>>>> + if (int_status)
>>>> + *int_status = 0;
>>>> + if (txbuf)
>>>> + *txbuf = new_tx_packet;
>>>> +
>>>> + new_tx_packet = NULL;
>>>> +
>>>> + return EFI_EXIT(EFI_SUCCESS);
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_transmit(struct efi_simple_network *this,
>>>> + ulong header_size, ulong buffer_size, void *buffer,
>>>> + struct efi_mac_address *src_addr,
>>>> + struct efi_mac_address *dest_addr, u16 *protocol)
>>>> +{
>>>> + EFI_ENTRY("%p, %lx, %lx, %p, %p, %p, %p", this, header_size,
>>>> + buffer_size, buffer, src_addr, dest_addr, protocol);
>>>> +
>>>> + if (header_size) {
>>>> + /* We would need to create the header if header_size != 0 */
>>>> + return EFI_EXIT(EFI_INVALID_PARAMETER);
>>>> + }
>>>> +
>>>> + /*
>>>> + * Some drivers need to have DMA aligned buffers, so if
>>>> + * it's misaligned, let's use our own.
>>>> + */
>>>> + if ((ulong)buffer & (ARCH_DMA_MINALIGN - 1)) {
>>>> + void *packet = memalign(ARCH_DMA_MINALIGN, buffer_size);
>>>> + memcpy(packet, buffer, buffer_size);
>>>> + net_send_packet(packet, buffer_size);
>>>> + free(packet);
>>>> + } else {
>>>> + net_send_packet(buffer, buffer_size);
>>>> + }
>>>> +
>>>> + new_tx_packet = buffer;
>>>> +
>>>> + return EFI_EXIT(EFI_SUCCESS);
>>>> +}
>>>> +
>>>> +static void efi_net_push(void *pkt, int len)
>>>> +{
>>>> + new_rx_packet = true;
>>>> +}
>>>> +
>>>> +static efi_status_t EFIAPI efi_net_receive(struct efi_simple_network *this,
>>>> + ulong *header_size, ulong *buffer_size, void *buffer,
>>>> + struct efi_mac_address *src_addr,
>>>> + struct efi_mac_address *dest_addr, u16 *protocol)
>>>> +{
>>>> + EFI_ENTRY("%p, %p, %p, %p, %p, %p, %p", this, header_size,
>>>> + buffer_size, buffer, src_addr, dest_addr, protocol);
>>>> +
>>>> + push_packet = efi_net_push;
>>>> + /* XXX With device model this reads multiple packets, we only want 1 */
>>>> + eth_rx();
>>>> + push_packet = NULL;
>>>> +
>>>> + if (!new_rx_packet)
>>>> + return EFI_EXIT(EFI_NOT_READY);
>>>> +
>>>> + if (*buffer_size < net_rx_packet_len) {
>>>> + /* Packet doesn't fit, try again with bigger buf */
>>>> + *buffer_size = net_rx_packet_len;
>>>> + return EFI_EXIT(EFI_BUFFER_TOO_SMALL);
>>>> + }
>>>> +
>>>> + memcpy(buffer, net_rx_packet, net_rx_packet_len);
>>>> + *buffer_size = net_rx_packet_len;
>>>> + new_rx_packet = false;
>>>> +
>>>> + return EFI_EXIT(EFI_SUCCESS);
>>>> +}
>>>> +
>>>> +static efi_status_t efi_net_open_dp(void *handle, efi_guid_t *protocol,
>>>> + void **protocol_interface, void *agent_handle,
>>>> + void *controller_handle, uint32_t attributes)
>>>> +{
>>>> + struct efi_simple_network *net = handle;
>>>> + struct efi_net_obj *netobj = container_of(net, struct efi_net_obj, net);
>>>> +
>>>> + *protocol_interface = netobj->dp;
>>>> +
>>>> + return EFI_SUCCESS;
>>>> +}
>>>> +
>>>> +static efi_status_t efi_net_open_pxe(void *handle, efi_guid_t *protocol,
>>>> + void **protocol_interface, void *agent_handle,
>>>> + void *controller_handle, uint32_t attributes)
>>>> +{
>>>> + struct efi_simple_network *net = handle;
>>>> + struct efi_net_obj *netobj = container_of(net, struct efi_net_obj, net);
>>>> +
>>>> + *protocol_interface = &netobj->pxe;
>>>> +
>>>> + return EFI_SUCCESS;
>>>> +}
>>>> +
>>>> +void efi_net_set_dhcp_ack(void *pkt, int len)
>>>> +{
>>>> + int maxsize = sizeof(*dhcp_ack);
>>>> +
>>>> + if (!dhcp_ack)
>>>> + dhcp_ack = malloc(maxsize);
>>>> +
>>>> + memcpy(dhcp_ack, pkt, min(len, maxsize));
>>>> +}
>>>> +
>>>> +/* This gets called from do_bootefi_exec(). */
>>>> +int efi_net_register(void **handle)
>>>> +{
>>>> + struct efi_net_obj *netobj;
>>>> + struct efi_device_path_file_path dp_net = {
>>>> + .dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE,
>>>> + .dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH,
>>>> + .dp.length = sizeof(dp_net),
>>>> + .str = { 'N', 'e', 't' },
>>>> + };
>>>> + struct efi_device_path_file_path dp_end = {
>>>> + .dp.type = DEVICE_PATH_TYPE_END,
>>>> + .dp.sub_type = DEVICE_PATH_SUB_TYPE_END,
>>>> + .dp.length = sizeof(dp_end),
>>>> + };
>>>> +
>>>> + if (!eth_get_dev()) {
>>>> + /* No eth device active, don't expose any */
>>>> + return 0;
>>>> + }
>>>> +
>>>> + /* We only expose the "active" eth device, so one is enough */
>>>> + netobj = calloc(1, sizeof(*netobj));
>>>> +
>>>> + /* Fill in object data */
>>>> + netobj->parent.protocols[0].guid = &efi_net_guid;
>>>> + netobj->parent.protocols[0].open = efi_return_handle;
>>>> + netobj->parent.protocols[1].guid = &efi_guid_device_path;
>>>> + netobj->parent.protocols[1].open = efi_net_open_dp;
>>>> + netobj->parent.protocols[2].guid = &efi_pxe_guid;
>>>> + netobj->parent.protocols[2].open = efi_net_open_pxe;
>>>> + netobj->parent.handle = &netobj->net;
>>>> + netobj->net.start = efi_net_start;
>>>> + netobj->net.stop = efi_net_stop;
>>>> + netobj->net.initialize = efi_net_initialize;
>>>> + netobj->net.reset = efi_net_reset;
>>>> + netobj->net.shutdown = efi_net_shutdown;
>>>> + netobj->net.receive_filters = efi_net_receive_filters;
>>>> + netobj->net.station_address = efi_net_station_address;
>>>> + netobj->net.statistics = efi_net_statistics;
>>>> + netobj->net.mcastiptomac = efi_net_mcastiptomac;
>>>> + netobj->net.nvdata = efi_net_nvdata;
>>>> + netobj->net.get_status = efi_net_get_status;
>>>> + netobj->net.transmit = efi_net_transmit;
>>>> + netobj->net.receive = efi_net_receive;
>>>> + netobj->net.mode = &netobj->net_mode;
>>>> + netobj->net_mode.state = EFI_NETWORK_STARTED;
>>>> + netobj->dp[0] = dp_net;
>>>> + netobj->dp[1] = dp_end;
>>>> + memcpy(netobj->net_mode.current_address.mac_addr, eth_get_ethaddr(), 6);
>>>> + netobj->net_mode.max_packet_size = PKTSIZE;
>>>
>>> Why is this statically created? Shouldn't it come from the U-Boot
>>> ethernet tables dynamically when it is needed?
>>
>> The driver as is only exposes a single interface for the currently selected network device. My main goal behind this was pxe boot - where you usually load the payload from tftp and continue acting on the same interface later on.
>>
>> I guess we could create devices for all network devices as well. I remember that I wanted to only expose network if it's really necessary because of resource usage. But I don't remember exactly what resource the peoblem was otoh ;).
>
> I think in general (given that you are writing this code and this is
> the best opportunity to get the design right) that things like this
> should look up U-Boot tables rather than creating their own. So a
> model where the device is scanned as needed seems better. Then if we
> want to change the constraints later, e.g. devices appear that were
> not previously present, then we can deal with that.
>
> I understand with block devices your point that there is no single
> table of block devices. However, this support will be applied soon
> (see u-boot-dm/master), even without driver model. I think we should
> fix these things rather than work around them, as the code will be
> more maintainable that way.
I agree wholeheartedly :). The beauty of "proper" open source code is
that you can actually modify the guts of it to make the code easier at
the end of the day.
> In this case I wonder if we should have an EFI device uclass, and
> allow devices to have this as a child? It would allow for easy
> enumeration and avoid another system-specific device table (something
> that driver model is trying to reduce).
I'm not 100% sure the EFI driver exposure is actually a child-parent
relationship with the respective driver model objects. In Java speech
it's more of an "interface" definition than a subclass.
But that said, I think that it may still make sense to move it into the
respective driver cores and just have the EFI structs part of the block
device structs.
However I don't consider it as very high priority at the moment.
Functionally nothing should change from a payload point of view and the
current code allows us to iron out bugs and have non-believers gain
faith in the whole uEFI story without breaking non-uEFI code paths ;).
And all of the actual interface code shouldn't change with a move into
device objects.
So how about we start to tackle this once the non-DM code is gone? That
should simplify things for everyone.
Alex
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