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([2a0d:3344:5521:6b10:2eb7:f61a:75:4534]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493c6377479sm28151965e9.15.2026.07.02.00.41.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 02 Jul 2026 00:41:52 -0700 (PDT) Message-ID: Date: Thu, 2 Jul 2026 09:41:50 +0200 Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next V4 4/6] devlink: Apply eswitch mode boot defaults To: Mark Bloch , Jiri Pirko , Eric Dumazet , Jakub Kicinski , Simon Horman Cc: Saeed Mahameed , Leon Romanovsky , Tariq Toukan , Andrew Lunn , Jonathan Corbet , Shuah Khan , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-doc@vger.kernel.org References: <20260629182102.245150-1-mbloch@nvidia.com> <20260629182102.245150-5-mbloch@nvidia.com> From: Paolo Abeni Content-Language: en-US In-Reply-To: <20260629182102.245150-5-mbloch@nvidia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 6/29/26 8:20 PM, Mark Bloch wrote: > Apply parsed devlink_eswitch_mode= defaults after devlink registration > and after successful reload. > > devl_register() may still be called before the device is ready for an > eswitch mode change, so keep a per-devlink delayed work item and pending > flag for the registration path. Registration queues the work, and the > worker tries to take the devlink instance lock. > > If the lock is busy, the worker requeues itself with a delay. > > For successful reloads that performed DRIVER_REINIT, devlink_reload() > already holds the devlink instance lock and the driver has completed > reload_up(). Clear pending work and apply the default directly from the > reload path instead of queueing work. > > If a user sets eswitch mode through netlink before the pending > registration work runs, clear the pending flag so the queued default does > not override that user request. Cancel pending default apply work when > freeing the devlink instance. > > Signed-off-by: Mark Bloch > --- > net/devlink/core.c | 198 +++++++++++++++++++++++++++++++----- > net/devlink/dev.c | 6 ++ > net/devlink/devl_internal.h | 5 + > 3 files changed, 182 insertions(+), 27 deletions(-) > > diff --git a/net/devlink/core.c b/net/devlink/core.c > index 5126509a9c4e..998e4ffd5dce 100644 > --- a/net/devlink/core.c > +++ b/net/devlink/core.c > @@ -5,6 +5,7 @@ > */ > > #include > +#include > #include > #include > #include > @@ -22,8 +23,12 @@ DEFINE_XARRAY_FLAGS(devlinks, XA_FLAGS_ALLOC); > > static char *devlink_default_esw_mode_param; > static bool devlink_default_esw_mode_match_all; > +static bool devlink_default_esw_mode_enabled; > static enum devlink_eswitch_mode devlink_default_esw_mode; > static LIST_HEAD(devlink_default_esw_mode_nodes); > +static struct workqueue_struct *devlink_default_esw_mode_wq; > + > +#define DEVLINK_DEFAULT_ESW_MODE_APPLY_DELAY msecs_to_jiffies(100) > > struct devlink_default_esw_mode_node { > struct list_head list; > @@ -166,6 +171,7 @@ static void __init devlink_default_esw_mode_nodes_clear(void) > } > > devlink_default_esw_mode_match_all = false; > + devlink_default_esw_mode_enabled = false; > } > > static int __init devlink_default_esw_mode_parse(char *str) > @@ -192,14 +198,113 @@ static int __init devlink_default_esw_mode_parse(char *str) > return err; > > err = devlink_default_esw_mode_handles_parse(handles); > - if (err) > + if (err) { > devlink_default_esw_mode_nodes_clear(); > - else > + } else { > devlink_default_esw_mode = esw_mode; > + devlink_default_esw_mode_enabled = true; > + } > > return err; > } > > +static bool devlink_default_esw_mode_match(struct devlink *devlink) > +{ > + const char *bus_name = devlink_bus_name(devlink); > + const char *dev_name = devlink_dev_name(devlink); > + struct devlink_default_esw_mode_node *node; > + > + if (devlink_default_esw_mode_match_all) > + return true; > + > + node = devlink_default_esw_mode_node_find(bus_name, dev_name); > + return !!node; > +} > + > +void devlink_default_esw_mode_apply(struct devlink *devlink) > +{ > + const struct devlink_ops *ops = devlink->ops; > + int err; > + > + devl_assert_locked(devlink); > + > + if (!devlink_default_esw_mode_match(devlink)) > + return; > + > + if (!ops->eswitch_mode_set) { > + if (!devlink_default_esw_mode_match_all) > + devl_warn(devlink, > + "devlink_eswitch_mode= selected this device but eswitch mode setting is not supported\n"); Not a very strong opinion on my side, but I *think* it would be more consistent to emit this warning even for devlink_default_esw_mode_match_all /P