This makes the user interface a little hostile. People thing of an MTU of 1500 bytes, but the corresponding packet is really 1514 bytes (including the 14 byte Ethernet header). A more friendly solution would configure the MTU (as before), but then derive the packet buffer size by adding the MAC header length. Instead, we define the packet buffer size then derive the MTU.
The MTU is not common currency in networking. On the wire, the only real issue is the MSS which is derived from MTU by subtracting the IP header and TCP header sizes (for the case of TCP). Now it is derived for the PKTSIZE by subtracting the IP header, the TCP header, and the MAC header sizes. So we should be all good and without the recurring 14 byte error in MTU's and MSS's.
Squashed commit of the following:
Trivial update to fix some spacing issues.
net/: Rename several macros containing _MTU to _PKTSIZE.
net/: Rename CONFIG_NET_SLIP_MTU to CONFIG_NET_SLIP_PKTSIZE and similarly for CONFIG_NET_TUN_MTU. These are not the MTU which does not include the size of the link layer header. These are the full size of the packet buffer memory (minus any GUARD bytes).
net/: Rename CONFIG_NET_6LOWPAN_MTU to CONFIG_NET_6LOWPAN_PKTSIZE and similarly for CONFIG_NET_TUN_MTU. These are not the MTU which does not include the size of the link layer header. These are the full size of the packet buffer memory (minus any GUARD bytes).
net/: Rename CONFIG_NET_ETH_MTU to CONFIG_NET_ETH_PKTSIZE. This is not the MTU which does not include the size of the link layer header. This is the full size of the packet buffer memory (minus any GUARD bytes).
net/: Rename the file d_mtu in the network driver structure to d_pktsize. That value saved there is not the MTU. The packetsize is the memory large enough to hold the maximum packet PLUS the size of the link layer header. The MTU does not include the link layer header.
Squashed commit of the following:
drivers/usbhost/usbhost_max3421e.c: Add USB tracing support. Fix compilation errors when assertions and debug is enabled.
drivers/usbhost/usbhost_max3421e.c: Fixes to get a clean compilation.
drivers/usbhost/usbhost_max3421e.c: Drivers is basically code complete.
drivers/usbhost/usbhost_max3421e.c: Missed a little bit of logic in the last commit.
drivers/usbhost/usbhost_max3421e.c: Completes implementatin of control transfers.
drivers/usbhost/usbhost_max3421e.c: Implements low-level part of packet receive.
drivers/usbhost/usbhost_max3421e.c: Reorder some functions add a little more transfer-related logic.
drivers/usbhost/usbhost_max3421e.c: Completes basic logic path for sending normal packets.
drivers/usbhost/usbhost_max3421e.c: Correct handling of SNDFIFO double buffering.
drivers/usbhost/usbhost_max3421e.c: Not necessary to set the ACKSTAT bit in host mode. Clean up some comments.
drivers/usbhost/usbhost_max3421e.c: Mostly cosmetic cleanup
drivers/usbhost/usbhost_max3421e.c: Revise some previous logic. Looks like the MAX3421E can handle 16 channels in host mode. A little bit of work on packet transfer logic.
Copy paste error fix
drivers/usbhost/usbhost_max3421e.c: Add some channel allocation logic.
drivers/usbhost/usbhost_max3421e.c: Add some initialization logic.
drivers/usbhost/usbhost_max3421e.c: Add logic to determine if a full or low speed device has been connected.
drivers/usbhost/usbhost_max3421e.c: Add interrupt handling and bus reset logic.
drivers/usbhost/usbhost_max3421e.c: Add framework for an MAX3421E host driver. Initial commit is just the STM32 OTGFS host driver with a few new SPI-related functions.
Add support for STM32F746G-disco board SDRAM
* add support for STM32F746G-disco board SDRAM
* changed fb config to use SDRAM and fixed compilation
Approved-by: GregoryN <gnutt@nuttx.org>
lpc17: Removed duplicate configuration variable definitions from Kconfig: CONFIG_USBHOST_BULK_DISABLE, CONFIG_USBHOST_INT_DISABLE, and USBHOST_ISOC_DISABLE. These are global USBHOST configurations and are all defined in drivers/usbhost/Kconfig.
lpc17: Correct scope of naming of configuration variables: CONFIG_USBHOST_TDBUFFERS->CONFIG_LPC17_USBHOST_TDBUFFERS, CONFIG_USBHOST_TDBUFSIZE->CONFIG_LPC17_USBHOST_TDBUFSIZE, and CONFIG_USBHOST_IOBUFSIZE->CONFIG_LPC17_USBHOST_IOBUFSIZE
lpc17: Correct scope of naming of configuration variables: CONFIG_USBHOST_NEDS->CONFIG_LPC17_USBHOST_NEDS and CONFIG_USBHOST_NTDS->CONFIG_LPC17_USBHOST_NTDS
lpc17: Correct scope of naming of configuration variable: CONFIG_USBHOST_OHCIRAM_SIZE->CONFIG_LPC17_OHCIRAM_SIZE
Fix a few typo/compilation problems.
net/: Remove all CONFIG_NET_xxx_TCP_RECVWNDO configuration variables. They were used only to initialize the d_recwndo of the network device structure which no longer exists.
net/: Remove the device TCP receive window field (d_recvwndo) from the device structure. That value is no longer retained, but is calculated dynamically.
Remove some dangling references to CONFIG_NET_TCP_RWND_CONTROL.
net/tcp: Take read-ahead throttling into account when calculating the TCP receive window size.
net/tcp: tcp_get_recvwindow() now returns the receive window size directly (vs. indirectly via the device structure).
net/tcp: Remove CONFIG_NET_TCP_RWND_CONTROL. TCP window algorithm is now trigged only by CONFIG_NET_TCP_READAHEAD.
stm32f7:I2C reset Configure I2C pins as GPIO output
Pins were reset to inputs in the deinit. This resets
them to outputs.
Approved-by: GregoryN <gnutt@nuttx.org>
