net/Kconfig

   1 #
   2 # Network configuration
   3 #
   4
   5 menuconfig NET
   6         bool "Networking support"
   7         default y
   8
   9 if NET
  10
  11 config ARP_TIMEOUT
  12         int "Milliseconds before trying ARP again"
  13         default 5000
  14
  15 config NET_RETRY_COUNT
  16         int "Number of timeouts before giving up"
  17         default 5
  18         help
  19           This variable defines the number of retries for network operations
  20           like ARP, RARP, TFTP, or BOOTP before giving up the operation.
  21
  22 config PROT_UDP
  23         bool "Enable generic udp framework"
  24         help
  25           Enable a generic udp framework that allows defining a custom
  26           handler for udp protocol.
  27
  28 config BOOTDEV_ETH
  29         bool "Enable bootdev for ethernet"
  30         depends on BOOTSTD
  31         default y
  32         help
  33           Provide a bootdev for ethernet so that is it possible to boot
  34           an operationg system over the network, using the PXE (Preboot
  35           Execution Environment) protocol.
  36
  37 config BOOTP_SEND_HOSTNAME
  38         bool "Send hostname to DNS server"
  39         help
  40           Some DHCP servers are capable to do a dynamic update of a
  41           DNS server. To do this, they need the hostname of the DHCP
  42           requester.
  43           If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
  44           of the "hostname" environment variable is passed as
  45           option 12 to the DHCP server.
  46
  47 config NET_RANDOM_ETHADDR
  48         bool "Random ethaddr if unset"
  49         help
  50           Selecting this will allow the Ethernet interface to function even
  51           when the ethaddr variable for that interface is unset.  In this case,
  52           a random MAC address in the locally administered address space is
  53           generated. It will be saved to the appropriate environment variable,
  54           too.
  55
  56 config NETCONSOLE
  57         bool "NetConsole support"
  58         help
  59           Support the 'nc' input/output device for networked console.
  60           See README.NetConsole for details.
  61
  62 config IP_DEFRAG
  63         bool "Support IP datagram reassembly"
  64         help
  65           Selecting this will enable IP datagram reassembly according
  66           to the algorithm in RFC815.
  67
  68 config NET_MAXDEFRAG
  69         int "Size of buffer used for IP datagram reassembly"
  70         depends on IP_DEFRAG
  71         default 16384
  72         range 1024 65536
  73         help
  74           This defines the size of the statically allocated buffer
  75           used for reassembly, and thus an upper bound for the size of
  76           IP datagrams that can be received.
  77
  78 config SYS_FAULT_ECHO_LINK_DOWN
  79         bool "Echo the inverted Ethernet link state to the fault LED"
  80         help
  81           Echo the inverted Ethernet link state to the fault LED.  Note, if
  82           this option is active, then CONFIG_SYS_FAULT_MII_ADDR also needs to
  83           be configured.
  84
  85 config TFTP_BLOCKSIZE
  86         int "TFTP block size"
  87         default 1468
  88         help
  89           Default TFTP block size.
  90           The MTU is typically 1500 for ethernet, so a TFTP block of
  91           1468 (MTU minus eth.hdrs) provides a good throughput with
  92           almost-MTU block sizes.
  93           You can also activate CONFIG_IP_DEFRAG to set a larger block.
  94
  95 config TFTP_PORT
  96         bool "Set TFTP UDP source/destination ports via the environment"
  97         help
  98           If this is defined, the environment variable tftpsrcp is used to
  99           supply the TFTP UDP source port value.  If tftpsrcp isn't defined,
 100           the normal pseudo-random port number generator is used.
 101
 102           Also, the environment variable tftpdstp is used to supply the TFTP
 103           UDP destination port value.  If tftpdstp isn't defined, the normal
 104           port 69 is used.
 105
 106           The purpose for tftpsrcp is to allow a TFTP server to blindly start
 107           the TFTP transfer using the pre-configured target IP address and UDP
 108           port. This has the effect of "punching through" the (Windows XP)
 109           firewall, allowing the remainder of the TFTP transfer to proceed
 110           normally.  A better solution is to properly configure the firewall,
 111           but sometimes that is not allowed.
 112
 113 config TFTP_WINDOWSIZE
 114         int "TFTP window size"
 115         default 1
 116         help
 117           Default TFTP window size.
 118           RFC7440 defines an optional window size of transmits,
 119           before an ack response is required.
 120           The default TFTP implementation implies a window size of 1.
 121
 122 config TFTP_TSIZE
 123         bool "Track TFTP transfers based on file size option"
 124         depends on CMD_TFTPBOOT
 125         default y if (ARCH_OMAP2PLUS || ARCH_K3)
 126         help
 127           By default, TFTP progress bar is increased for each received UDP
 128           frame, which can lead into long time being spent for sending
 129           data over the UART. Enabling this option, TFTP queries the file
 130           size from server, and if supported, limits the progress bar to
 131           50 characters total which fits on single line.
 132
 133 config SERVERIP_FROM_PROXYDHCP
 134         bool "Get serverip value from Proxy DHCP response"
 135         help
 136           Allows bootfile config to be fetched from Proxy DHCP server
 137                 while IP is obtained from main DHCP server.
 138
 139 config SERVERIP_FROM_PROXYDHCP_DELAY_MS
 140         int "# of additional milliseconds to wait for ProxyDHCP response"
 141         default 100
 142         help
 143           Amount of additional time to wait for ProxyDHCP response after
 144                 receiving response from main DHCP server. Has no effect if
 145                 SERVERIP_FROM_PROXYDHCP is false.
 146
 147 config KEEP_SERVERADDR
 148         bool "Write the server's MAC address to 'serveraddr'"
 149         default y if SANDBOX
 150         help
 151           Keeps the server's MAC address, in the env 'serveraddr'
 152           for passing to bootargs (like Linux's netconsole option). If this is
 153           enabled, when an ARP reply is received, the server's IP address is
 154           written there.
 155
 156 config UDP_CHECKSUM
 157         bool "Check the UDP checksum"
 158         default y if SANDBOX
 159         help
 160           Enable this to verify the checksum on UDP packets. If the checksum
 161           is wrong then the packet is discarded and an error is shown, like
 162           "UDP wrong checksum 29374a23 30ff3826"
 163
 164 config BOOTP_SERVERIP
 165         bool "Use the 'serverip' env var for tftp, not bootp"
 166         help
 167           Enable this if the TFTP server will be the 'serverip' environment
 168           variable, not the BOOTP server. This affects the operation of both
 169           bootp and tftp.
 170
 171 config BOOTP_MAX_ROOT_PATH_LEN
 172         int "Option 17 root path length"
 173         default 64
 174         help
 175           Select maximal length of option 17 root path.
 176
 177 config USE_GATEWAYIP
 178         bool "Set a default 'gateway' value in the environment"
 179         help
 180           Defines a default value for the IP address of the default router
 181           where packets to other networks are sent to.  (Environment variable
 182           "gatewayip")
 183
 184 config GATEWAYIP
 185         string "Value of the default 'gateway' value in the environment"
 186         depends on USE_GATEWAYIP
 187
 188 config USE_IPADDR
 189         bool "Set a default 'ipaddr' value in the environment"
 190         help
 191           Define a default value for the IP address to use for the default
 192           Ethernet interface, in case this is not determined through e.g.
 193           bootp.  (Environment variable "ipaddr")
 194
 195 config IPADDR
 196         string "Value of the default 'ipaddr' value in the environment"
 197         depends on USE_IPADDR
 198
 199 config USE_NETMASK
 200         bool "Set a default 'netmask' value in the environment"
 201         help
 202           Defines a default value for the subnet mask (or routing prefix) which
 203           is used to determine if an IP address belongs to the local subnet or
 204           needs to be forwarded through a router.  (Environment variable "netmask")
 205
 206 config NETMASK
 207         string "Value of the default 'netmask' value in the environment"
 208         depends on USE_NETMASK
 209
 210 config USE_ROOTPATH
 211         bool "Set a default 'rootpath' value in the environment"
 212
 213 config ROOTPATH
 214         string "Value of the default 'rootpath' value in the environment"
 215         depends on USE_ROOTPATH
 216         default "/opt/nfsroot"
 217
 218 config USE_SERVERIP
 219         bool "Set a default 'serverip' value in the environment"
 220         help
 221           Defines a default value for the IP address of a TFTP server to
 222           contact when using the "tftboot" command.  (Environment variable
 223           "serverip")
 224
 225 config SERVERIP
 226         string "Value of the default 'serverip' value in the environment"
 227         depends on USE_SERVERIP
 228
 229 config PROT_TCP
 230         bool "TCP stack"
 231         help
 232           Enable a generic tcp framework that allows defining a custom
 233           handler for tcp protocol.
 234
 235 config PROT_TCP_SACK
 236         bool "TCP SACK support"
 237         depends on PROT_TCP
 238         help
 239           TCP protocol with SACK. SACK means selective acknowledgements.
 240           By turning this option on TCP will learn what segments are already
 241           received. So that it improves TCP's retransmission efficiency.
 242           This option should be turn on if you want to achieve the fastest
 243           file transfer possible.
 244
 245 config IPV6
 246         bool "IPv6 support"
 247         help
 248           Enable IPv6 support. It includes Neighbour Discovery protocol, ICMPv6
 249           and auxiliary stuff to make it work. Since it is enabled u-boot
 250           network subsystem can get and handle incoming packets and send packets
 251           through IPv6 network. It allows to use environment variables such as
 252           ip6addr, serverip6. If a u-boot command is capable to parse an IPv6
 253           address and find it, it will force using IPv6 in the network stack.
 254
 255 endif   # if NET
 256
 257 config SYS_RX_ETH_BUFFER
 258         int "Number of receive packet buffers"
 259         default 4
 260         help
 261           Defines the number of Ethernet receive buffers. On some Ethernet
 262           controllers it is recommended to set this value to 8 or even higher,
 263           since all buffers can be full shortly after enabling the interface on
 264           high Ethernet traffic.