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LPC546XX: Correct Ethernet length calculations 

Subtract 4 from the received packet length - the buffer contains the
CRC, which we shouldn't pass up.

Ensure we allocate receive buffers of a size corresponding to the
rounded-up size we tell the hardware - the hardware was overrunning the
allocation by a couple of bytes.
pull/6847/head
Kevin Bracey 2018-05-18 12:04:00 +03:00
parent 97b9980c8c
commit 7e4eb5c24b
1 changed files with 15 additions and 15 deletions
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24
features/netsocket/emac-drivers/TARGET_NXP_EMAC/TARGET_LPC546XX/lpc546xx_emac.cpp
View File

@ -202,15 +202,6 @@ bool LPC546XX_EMAC::low_level_init_successful()
AT_NONCACHEABLE_SECTION_ALIGN(static enet_rx_bd_struct_t rx_desc_start_addr[ENET_RX_RING_LEN], ENET_BUFF_ALIGNMENT);
AT_NONCACHEABLE_SECTION_ALIGN(static enet_tx_bd_struct_t tx_desc_start_addr[ENET_TX_RING_LEN], ENET_BUFF_ALIGNMENT);
/* Create buffers for each receive BD */
for (i = 0; i < ENET_RX_RING_LEN; i++) {
rx_buff[i] = memory_manager->alloc_heap(ENET_ETH_MAX_FLEN, ENET_BUFF_ALIGNMENT);
if (NULL == rx_buff[i])
return false;
rx_ptr[i] = (uint32_t)memory_manager->get_ptr(rx_buff[i]);
}
/* prepare the buffer configuration. */
enet_buffer_config_t buffCfg = {
ENET_RX_RING_LEN,
@ -220,9 +211,18 @@ bool LPC546XX_EMAC::low_level_init_successful()
&rx_desc_start_addr[0],
&rx_desc_start_addr[ENET_RX_RING_LEN],
rx_ptr,
ENET_ALIGN(ENET_ETH_MAX_FLEN, ENET_BUFF_ALIGNMENT),
ENET_BuffSizeAlign(ENET_ETH_MAX_FLEN),
};
/* Create buffers for each receive BD */
for (i = 0; i < ENET_RX_RING_LEN; i++) {
rx_buff[i] = memory_manager->alloc_heap(buffCfg.rxBuffSizeAlign, ENET_BUFF_ALIGNMENT);
if (NULL == rx_buff[i])
return false;
rx_ptr[i] = (uint32_t)memory_manager->get_ptr(rx_buff[i]);
}
ENET_Init(ENET, &config, hwaddr, refClock);
/* Enable the tx & rx interrupt. */
@ -266,7 +266,7 @@ emac_mem_buf_t *LPC546XX_EMAC::low_level_input()
update_read_buffer(bdPtr, NULL);
} else {
if (bdPtr->control & ENET_RXDESCRIP_WR_LD_MASK) {
length = (bdPtr->control & ENET_RXDESCRIP_WR_PACKETLEN_MASK);
length = (bdPtr->control & ENET_RXDESCRIP_WR_PACKETLEN_MASK) - 4;
} else {
length = rxBdRing->rxBuffSizeAlign;
}
@ -276,7 +276,7 @@ emac_mem_buf_t *LPC546XX_EMAC::low_level_input()
memory_manager->set_len(p, length);
/* Attempt to queue new buffer */
temp_rxbuf = memory_manager->alloc_heap(ENET_ETH_MAX_FLEN, ENET_BUFF_ALIGNMENT);
temp_rxbuf = memory_manager->alloc_heap(rxBdRing->rxBuffSizeAlign, ENET_BUFF_ALIGNMENT);
if (NULL == temp_rxbuf) {
/* Re-queue the same buffer */
update_read_buffer(bdPtr, NULL);