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drivers/net/{e1000|igc}: fix reinit for RX/TX rings

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Descriptor head is managed by HW and should not be modified by SW unless:
1. device is after a reset
2. device is before enabling TX or RX

Also set correct tail for RX which should point at the end of ring
(descriptor ring is zero-indexed).

Signed-off-by: p-szafonimateusz <p-szafonimateusz@xiaomi.com>
This commit is contained in:
p-szafonimateusz
2025-06-03 14:07:56 +02:00
committed by Xiang Xiao
parent bdde180d7a
commit 0f537dcb97
2 changed files with 26 additions and 10 deletions
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drivers/net/igc.c
+13 -5
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@@ -438,6 +438,9 @@ static void igc_dump_mem(FAR struct igc_driver_s *priv, FAR const char *msg)
* Returned Value:
* None
*
* Assumption:
* This function can be called only after card reset and when TX is disabled
*
*****************************************************************************/
static void igc_txclean(FAR struct igc_driver_s *priv)
@@ -478,6 +481,9 @@ static void igc_txclean(FAR struct igc_driver_s *priv)
* Returned Value:
* None
*
* Assumption:
* This function can be called only after card reset and when RX is disabled
*
*****************************************************************************/
static void igc_rxclean(FAR struct igc_driver_s *priv)
@@ -485,7 +491,7 @@ static void igc_rxclean(FAR struct igc_driver_s *priv)
priv->rx_now = 0;
igc_putreg_mem(priv, IGC_RDH0, 0);
igc_putreg_mem(priv, IGC_RDT0, 0);
igc_putreg_mem(priv, IGC_RDT0, IGC_RX_DESC - 1);
}
/*****************************************************************************
@@ -1061,6 +1067,12 @@ static void igc_disable(FAR struct igc_driver_s *priv)
igc_putreg_mem(priv, IGC_RCTL, 0);
/* We have to reset device, otherwise writing to RDH and THD corrupts
* the device state.
*/
igc_putreg_mem(priv, IGC_CTRL, IGC_CTRL_DEVRST);
/* Reset Tx tail */
igc_txclean(priv);
@@ -1214,10 +1226,6 @@ static void igc_enable(FAR struct igc_driver_s *priv)
igc_rxclean(priv);
/* All RX descriptors available */
igc_putreg_mem(priv, IGC_RDT0, IGC_RX_DESC);
#ifdef CONFIG_DEBUG_NET_INFO
/* Dump memory */