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mimxrt/eth: Fix an Ethernet transmit error.

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Sometimes frames could not be sent immediately because the controller was
still busy with previous frames.  Then, an error was returned to lwip.
This fix adds a limited number of retries for this busy state, waiting
100µs before the next attempt.  Typically the transmit succeeds now at the
second attempt.

Second change: Reset the controller for a clean state after soft reset.
This commit is contained in:
robert-hh 2022-02-03 15:41:56 +01:00 committed by Damien George
parent 5ea85b7a85
commit b0d460cd7d
1 changed files with 21 additions and 4 deletions
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23
ports/mimxrt/eth.c
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@ -174,7 +174,7 @@ void eth_irq_handler(ENET_Type *base, enet_handle_t *handle, enet_event_t event,
}
} while (status != kStatus_ENET_RxFrameEmpty);
} else {
ENET_ClearInterruptStatus(base, kENET_TxFrameInterrupt);
ENET_ClearInterruptStatus(base, ENET_TX_INTERRUPT | ENET_ERR_INTERRUPT);
}
}
@ -279,6 +279,7 @@ void eth_init(eth_t *self, int mac_idx, const phy_operations_t *phy_ops, int phy
mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("PHY Init failed."));
}
ENET_Reset(ENET);
ENET_GetDefaultConfig(&enet_config);
enet_config.miiSpeed = (enet_mii_speed_t)speed;
enet_config.miiDuplex = (enet_mii_duplex_t)duplex;
@ -311,6 +312,22 @@ void eth_set_trace(eth_t *self, uint32_t value) {
/*******************************************************************************/
// ETH-LwIP bindings
STATIC err_t eth_send_frame_blocking(ENET_Type *base, enet_handle_t *handle, uint8_t *buffer, int len) {
status_t status;
int i;
#define XMIT_LOOP 10
// Try a few times to send the frame
for (i = XMIT_LOOP; i > 0; i--) {
status = ENET_SendFrame(base, handle, buffer, len);
if (status != kStatus_ENET_TxFrameBusy) {
break;
}
ticks_delay_us64(100);
}
return status;
}
STATIC err_t eth_netif_output(struct netif *netif, struct pbuf *p) {
// This function should always be called from a context where PendSV-level IRQs are disabled
status_t status;
@ -319,7 +336,7 @@ STATIC err_t eth_netif_output(struct netif *netif, struct pbuf *p) {
eth_trace(netif->state, (size_t)-1, p, NETUTILS_TRACE_IS_TX | NETUTILS_TRACE_NEWLINE);
if (p->next == NULL) {
status = ENET_SendFrame(ENET, &g_handle, p->payload, p->len);
status = eth_send_frame_blocking(ENET, &g_handle, p->payload, p->len);
} else {
// frame consists of several parts. Copy them together and send them
size_t length = 0;
@ -330,7 +347,7 @@ STATIC err_t eth_netif_output(struct netif *netif, struct pbuf *p) {
length += p->len;
p = p->next;
}
status = ENET_SendFrame(ENET, &g_handle, tx_frame, length);
status = eth_send_frame_blocking(ENET, &g_handle, tx_frame, length);
}
return status == kStatus_Success ? ERR_OK : ERR_BUF;
}