From: Valentin Longchamp <valentin@longchamp.me>
To: linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org,
kuba@kernel.org, davem@davemloft.net, hkallweit1@gmail.com
Cc: Valentin Longchamp <valentin@longchamp.me>,
Matteo Ghidoni <matteo.ghidoni@ch.abb.com>
Subject: [PATCH] net/ethernet/freescale: rework quiesce/activate for ucc_geth
Date: Wed, 20 May 2020 17:53:50 +0200 [thread overview]
Message-ID: <20200520155350.1372-1-valentin@longchamp.me> (raw)
ugeth_quiesce/activate are used to halt the controller when there is a
link change that requires to reconfigure the mac.
The previous implementation called netif_device_detach(). This however
causes the initial activation of the netdevice to fail precisely because
it's detached. For details, see [1].
A possible workaround was the revert of commit
net: linkwatch: add check for netdevice being present to linkwatch_do_dev
However, the check introduced in the above commit is correct and shall be
kept.
The netif_device_detach() is thus replaced with
netif_tx_stop_all_queues() that prevents any tranmission. This allows to
perform mac config change required by the link change, without detaching
the corresponding netdevice and thus not preventing its initial
activation.
[1] https://lists.openwall.net/netdev/2020/01/08/201
Signed-off-by: Valentin Longchamp <valentin@longchamp.me>
Acked-by: Matteo Ghidoni <matteo.ghidoni@ch.abb.com>
---
drivers/net/ethernet/freescale/ucc_geth.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/freescale/ucc_geth.c b/drivers/net/ethernet/freescale/ucc_geth.c
index 6e5f6dd169b5..552e7554a9f8 100644
--- a/drivers/net/ethernet/freescale/ucc_geth.c
+++ b/drivers/net/ethernet/freescale/ucc_geth.c
@@ -42,6 +42,7 @@
#include <soc/fsl/qe/ucc.h>
#include <soc/fsl/qe/ucc_fast.h>
#include <asm/machdep.h>
+#include <net/sch_generic.h>
#include "ucc_geth.h"
@@ -1548,11 +1549,8 @@ static int ugeth_disable(struct ucc_geth_private *ugeth, enum comm_dir mode)
static void ugeth_quiesce(struct ucc_geth_private *ugeth)
{
- /* Prevent any further xmits, plus detach the device. */
- netif_device_detach(ugeth->ndev);
-
- /* Wait for any current xmits to finish. */
- netif_tx_disable(ugeth->ndev);
+ /* Prevent any further xmits */
+ netif_tx_stop_all_queues(ugeth->ndev);
/* Disable the interrupt to avoid NAPI rescheduling. */
disable_irq(ugeth->ug_info->uf_info.irq);
@@ -1565,7 +1563,10 @@ static void ugeth_activate(struct ucc_geth_private *ugeth)
{
napi_enable(&ugeth->napi);
enable_irq(ugeth->ug_info->uf_info.irq);
- netif_device_attach(ugeth->ndev);
+
+ /* allow to xmit again */
+ netif_tx_wake_all_queues(ugeth->ndev);
+ __netdev_watchdog_up(ugeth->ndev);
}
/* Called every time the controller might need to be made
--
2.25.1
next reply other threads:[~2020-05-20 15:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 15:53 Valentin Longchamp [this message]
2020-05-22 22:50 ` [PATCH] net/ethernet/freescale: rework quiesce/activate for ucc_geth David Miller
2020-05-26 5:16 ` Valentin Longchamp
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