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drivers: ethernet: eth_nxp_enet_qos: increase default buffer descriptors

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Increased the default number of TX and RX buffer descriptors from 4 to
16. Since the current default buffer size (CONFIG_NET_BUF_DATA_SIZE) is
128, increasing the number of RX buffers is needed to be able to receive
at least one frame of a maximum size split between multiple buffers.

The default number of TX buffers was increased to match the number of RX
buffers and to be able to transmit large frames with many fragments.

Added build-time configuration validation to ensure that the combined
size of all RX buffers is sufficient to receive a maximum-sized Ethernet
frame.

Signed-off-by: Stanislav Poboril <stanislav.poboril@nxp.com>
This commit is contained in:
Stanislav Poboril 2025-06-09 12:30:32 +02:00 • committed by Dan Kalowsky
commit 34f9cd9490
2 changed files with 10 additions and 2 deletions
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8
drivers/ethernet/eth_nxp_enet_qos/Kconfig
View file

@ -36,17 +36,21 @@ config ETH_NXP_ENET_QOS_MAC_UNIQUE_MAC_ADDRESS
config ETH_NXP_ENET_QOS_TX_BUFFER_DESCRIPTORS
int "Number of tx buffer descriptors"
default 4
default 16
range 4 1024
help
Number of TX buffer descriptors.
config ETH_NXP_ENET_QOS_RX_BUFFER_DESCRIPTORS
int "Number of rx buffer descriptors"
default 4
default 16
range 4 1024
help
Number of RX buffer descriptors.
Each descriptor references a buffer of a size of CONFIG_NET_BUF_DATA_SIZE
(with the two least significant bits ignored), so set this to a value
large enough so that at least one frame of a maximum size can be
received into all buffers combined.
config ETH_NXP_ENET_QOS_DMA_RESET_WAIT_TIME
int "Time in microseconds to wait for software reset"

4
drivers/ethernet/eth_nxp_enet_qos/eth_nxp_enet_qos_mac.c
View file

@ -24,6 +24,10 @@ LOG_MODULE_REGISTER(eth_nxp_enet_qos_mac, CONFIG_ETHERNET_LOG_LEVEL);
#include "../eth.h"
#include "nxp_enet_qos_priv.h"
/* Verify configuration */
BUILD_ASSERT((ENET_QOS_RX_BUFFER_SIZE * NUM_RX_BUFDESC) >= ENET_QOS_MAX_NORMAL_FRAME_LEN,
"ENET_QOS_RX_BUFFER_SIZE * NUM_RX_BUFDESC is not large enough to receive a full frame");
static const uint32_t rx_desc_refresh_flags =
OWN_FLAG | RX_INTERRUPT_ON_COMPLETE_FLAG | BUF1_ADDR_VALID_FLAG;