linux-kernel - Re: [PATCH net v2] ice: Unregister netdev and devlink

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Date:   Mon, 19 Jun 2023 17:07:21 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Petr Oros <poros@...hat.com>
Cc:     netdev@...r.kernel.org, jesse.brandeburg@...el.com,
        anthony.l.nguyen@...el.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        michal.swiatkowski@...ux.intel.com, jacob.e.keller@...el.com,
        intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org,
        pmenzel@...gen.mpg.de
Subject: Re: [PATCH net v2] ice: Unregister netdev and devlink_port only once

Mon, Jun 19, 2023 at 12:58:13PM CEST, poros@...hat.com wrote:
>Since commit 6624e780a577fc ("ice: split ice_vsi_setup into smaller
>functions") ice_vsi_release does things twice. There is unregister
>netdev which is unregistered in ice_deinit_eth also.

You need to describe more relationship between ice_vsi_release() and
ice_deinit_eth(). From a quick look, I don't see that ice_deinit_eth()
is always called before/afeter ice_vsi_release().

Ice init/release flows are very hard to follow :/


>
>It also unregisters the devlink_port twice which is also unregistered
>in ice_deinit_eth(). This double deregistration is hidden because
>devl_port_unregister ignores the return value of xa_erase.

This call for another patch, doesn't it? :)


>
>[   68.642167] Call Trace:
>[   68.650385]  ice_devlink_destroy_pf_port+0xe/0x20 [ice]
>[   68.655656]  ice_vsi_release+0x445/0x690 [ice]
>[   68.660147]  ice_deinit+0x99/0x280 [ice]
>[   68.664117]  ice_remove+0x1b6/0x5c0 [ice]
>
>[  171.103841] Call Trace:
>[  171.109607]  ice_devlink_destroy_pf_port+0xf/0x20 [ice]
>[  171.114841]  ice_remove+0x158/0x270 [ice]
>[  171.118854]  pci_device_remove+0x3b/0xc0
>[  171.122779]  device_release_driver_internal+0xc7/0x170
>[  171.127912]  driver_detach+0x54/0x8c
>[  171.131491]  bus_remove_driver+0x77/0xd1
>[  171.135406]  pci_unregister_driver+0x2d/0xb0
>[  171.139670]  ice_module_exit+0xc/0x55f [ice]
>
>Fixes: 6624e780a577 ("ice: split ice_vsi_setup into smaller functions")
>Signed-off-by: Petr Oros <poros@...hat.com>
>---
>v2: reword subject
>
>v1: https://lore.kernel.org/netdev/20230619084948.360128-1-poros@redhat.com/
>---
> drivers/net/ethernet/intel/ice/ice_lib.c | 27 ------------------------
> 1 file changed, 27 deletions(-)
>
>diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
>index 11ae0e41f518a1..284a1f0bfdb545 100644
>--- a/drivers/net/ethernet/intel/ice/ice_lib.c
>+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
>@@ -3272,39 +3272,12 @@ int ice_vsi_release(struct ice_vsi *vsi)
> 		return -ENODEV;
> 	pf = vsi->back;
> 
>-	/* do not unregister while driver is in the reset recovery pending
>-	 * state. Since reset/rebuild happens through PF service task workqueue,
>-	 * it's not a good idea to unregister netdev that is associated to the
>-	 * PF that is running the work queue items currently. This is done to
>-	 * avoid check_flush_dependency() warning on this wq
>-	 */
>-	if (vsi->netdev && !ice_is_reset_in_progress(pf->state) &&
>-	    (test_bit(ICE_VSI_NETDEV_REGISTERED, vsi->state))) {
>-		unregister_netdev(vsi->netdev);
>-		clear_bit(ICE_VSI_NETDEV_REGISTERED, vsi->state);
>-	}
>-
>-	if (vsi->type == ICE_VSI_PF)
>-		ice_devlink_destroy_pf_port(pf);
>-
> 	if (test_bit(ICE_FLAG_RSS_ENA, pf->flags))
> 		ice_rss_clean(vsi);
> 
> 	ice_vsi_close(vsi);
> 	ice_vsi_decfg(vsi);
> 
>-	if (vsi->netdev) {
>-		if (test_bit(ICE_VSI_NETDEV_REGISTERED, vsi->state)) {
>-			unregister_netdev(vsi->netdev);
>-			clear_bit(ICE_VSI_NETDEV_REGISTERED, vsi->state);
>-		}
>-		if (test_bit(ICE_VSI_NETDEV_ALLOCD, vsi->state)) {
>-			free_netdev(vsi->netdev);
>-			vsi->netdev = NULL;
>-			clear_bit(ICE_VSI_NETDEV_ALLOCD, vsi->state);
>-		}
>-	}
>-
> 	/* retain SW VSI data structure since it is needed to unregister and
> 	 * free VSI netdev when PF is not in reset recovery pending state,\
> 	 * for ex: during rmmod.
>-- 
>2.41.0
>
>