[Intel-wired-lan] [PATCH] igc: Clean the TX buffer and TX descriptor ring

[Intel-wired-lan] [PATCH] igc: Clean the TX buffer and TX descriptor ring

[Muhammad Husaini Zulkifli]

There could be a race condition during link down where interrupt
being generated and igc_clean_tx_irq() been called to perform the
TX completion. Properly clear the TX buffer and TX descriptor ring
to avoid those case.

Fixes: 13b5b7fd6a4a ("igc: Add support for Tx/Rx rings")
Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index ba49728be919a..839f2c1a6f429 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -254,6 +254,13 @@ static void igc_clean_tx_ring(struct igc_ring *tx_ring)
 	/* reset BQL for queue */
 	netdev_tx_reset_queue(txring_txq(tx_ring));
 
+	/* Zero out the buffer ring */
+	memset(tx_ring->tx_buffer_info, 0,
+	       sizeof(*tx_ring->tx_buffer_info) * tx_ring->count);
+
+	/* Zero out the descriptor ring */
+	memset(tx_ring->desc, 0, tx_ring->size);
+
 	/* reset next_to_use and next_to_clean */
 	tx_ring->next_to_use = 0;
 	tx_ring->next_to_clean = 0;
-- 
2.17.1

_______________________________________________
Intel-wired-lan mailing list
Intel-wired-lan@osuosl.org
https://lists.osuosl.org/mailman/listinfo/intel-wired-lan

Re: [Intel-wired-lan] [PATCH] igc: Clean the TX buffer and TX descriptor ring

[naamax.meir]

On 4/10/2023 09:51, Muhammad Husaini Zulkifli wrote:
> There could be a race condition during link down where interrupt
> being generated and igc_clean_tx_irq() been called to perform the
> TX completion. Properly clear the TX buffer and TX descriptor ring
> to avoid those case.
> 
> Fixes: 13b5b7fd6a4a ("igc: Add support for Tx/Rx rings")
> Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>
> ---
>   drivers/net/ethernet/intel/igc/igc_main.c | 7 +++++++
>   1 file changed, 7 insertions(+)

Tested-by: Naama Meir <naamax.meir@linux.intel.com>
_______________________________________________
Intel-wired-lan mailing list
Intel-wired-lan@osuosl.org
https://lists.osuosl.org/mailman/listinfo/intel-wired-lan