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CONFIG_ETH_SAM_GMAC_BUF_RX_COUNT¶
Network RX buffers preallocated by the SAM ETH driver
Type: int
Help¶
Number of network buffers that will be permanently allocated by the Ethernet driver. These buffers are used in receive path. They are preallocated by the driver and made available to the GMAC module to be filled in with incoming data. Their number has to be large enough to fit at least one complete Ethernet frame. SAM ETH driver will always allocate that amount of buffers for itself thus reducing the NET_BUF_RX_COUNT which is a total amount of RX data buffers used by the whole networking stack. One has to ensure that NET_PKT_RX_COUNT is large enough to fit at least two Ethernet frames: one being received by the GMAC module and the other being processed by the higher layer networking stack.
Direct dependencies¶
ETH_SAM_GMAC && NET_L2_ETHERNET
(Includes any dependencies from if’s and menus.)
Defaults¶
- 12 if
ETH_SAM_GMAC&&NET_L2_ETHERNET
Kconfig definition¶
At drivers/ethernet/Kconfig.sam_gmac:52
Included via Kconfig:10 → Kconfig.zephyr:35 → drivers/Kconfig:18 → drivers/ethernet/Kconfig:31
Menu path: (top menu) → Device Drivers → Ethernet Drivers → Atmel SAM Ethernet driver
config ETH_SAM_GMAC_BUF_RX_COUNT
int
prompt "Network RX buffers preallocated by the SAM ETH driver" if ETH_SAM_GMAC && NET_L2_ETHERNET
default 12 if ETH_SAM_GMAC && NET_L2_ETHERNET
depends on ETH_SAM_GMAC && NET_L2_ETHERNET
help
Number of network buffers that will be permanently allocated by the
Ethernet driver. These buffers are used in receive path. They are
preallocated by the driver and made available to the GMAC module to be
filled in with incoming data. Their number has to be large enough to fit
at least one complete Ethernet frame. SAM ETH driver will always allocate
that amount of buffers for itself thus reducing the NET_BUF_RX_COUNT
which is a total amount of RX data buffers used by the whole networking
stack. One has to ensure that NET_PKT_RX_COUNT is large enough to
fit at least two Ethernet frames: one being received by the GMAC module
and the other being processed by the higher layer networking stack.
(Definitions include propagated dependencies, including from if’s and menus.)