From patchwork Fri Aug 4 15:05:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Petr Pavlu X-Patchwork-Id: 13342005 X-Patchwork-Delegate: kuba@kernel.org Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6CF9612B9C for ; Fri, 4 Aug 2023 15:06:10 +0000 (UTC) Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 87C9B49D4; Fri, 4 Aug 2023 08:06:04 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 24F061F8A6; Fri, 4 Aug 2023 15:06:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1691161563; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=SSqcjcZX0b28uH4rzMscBrpAGrJTrQsT/baQHuXN6cI=; b=uKTW5XRk2aYDwg8d+4TNoO2s5fBIDlCNzqH2672FWY7+frlsGf7G6EeVvCAn6tGP6rLy5A wPt/4KfJgpfWV/nv3I+1lDMb7yOGL6h7auFYAo3w1qTt6ULXqSc7g6BuLpOuedDzOV06/4 3Mi2QmEUgWVTuMFd44ZN3d7elKPmtPg= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id E3514133B5; Fri, 4 Aug 2023 15:06:02 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 2LfKNtoTzWRwSQAAMHmgww (envelope-from ); Fri, 04 Aug 2023 15:06:02 +0000 From: Petr Pavlu To: tariqt@nvidia.com, yishaih@nvidia.com, leon@kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, jgg@ziepe.ca, netdev@vger.kernel.org, linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org, Petr Pavlu Subject: [PATCH net-next 01/10] mlx4: Get rid of the mlx4_interface.get_dev callback Date: Fri, 4 Aug 2023 17:05:18 +0200 Message-Id: <20230804150527.6117-2-petr.pavlu@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230804150527.6117-1-petr.pavlu@suse.com> References: <20230804150527.6117-1-petr.pavlu@suse.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Simplify the mlx4 driver interface by removing mlx4_get_protocol_dev() and the associated mlx4_interface.get_dev callbacks. This is done in preparation to use an auxiliary bus to model the mlx4 driver structure. The change is motivated by the following situation: * The mlx4_en interface is being initialized by mlx4_en_add() and mlx4_en_activate(). * The latter activate function calls mlx4_en_init_netdev() -> register_netdev() to register a new net_device. * A netdev event NETDEV_REGISTER is raised for the device. * The netdev notififier mlx4_ib_netdev_event() is called and it invokes mlx4_ib_scan_netdevs() -> mlx4_get_protocol_dev() -> mlx4_en_get_netdev() [via mlx4_interface.get_dev]. This chain creates a problem when mlx4_en gets switched to be an auxiliary driver. It contains two device calls which would both need to take a respective device lock. Avoid this situation by updating mlx4_ib_scan_netdevs() to no longer call mlx4_get_protocol_dev() but instead to utilize the information passed in net_device.parent and net_device.dev_port. This data is sufficient to determine that an updated port is one that the mlx4_ib driver should take care of and to keep mlx4_ib_dev.iboe.netdevs up to date. Following that, update mlx4_ib_get_netdev() to also not call mlx4_get_protocol_dev() and instead scan all current netdevs to find find a matching one. Note that mlx4_ib_get_netdev() is called early from ib_register_device() and cannot use data tracked in mlx4_ib_dev.iboe.netdevs which is not at that point yet set. Finally, remove function mlx4_get_protocol_dev() and the mlx4_interface.get_dev callbacks (only mlx4_en_get_netdev()) as they became unused. Signed-off-by: Petr Pavlu Tested-by: Leon Romanovsky Reviewed-by: Leon Romanovsky --- drivers/infiniband/hw/mlx4/main.c | 89 ++++++++++---------- drivers/net/ethernet/mellanox/mlx4/en_main.c | 8 -- drivers/net/ethernet/mellanox/mlx4/intf.c | 21 ----- include/linux/mlx4/driver.h | 3 - 4 files changed, 43 insertions(+), 78 deletions(-) diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c index b18e9f2adc82..7dd70d778b6b 100644 --- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -125,12 +125,14 @@ static struct net_device *mlx4_ib_get_netdev(struct ib_device *device, u32 port_num) { struct mlx4_ib_dev *ibdev = to_mdev(device); - struct net_device *dev; + struct net_device *dev, *ret = NULL; rcu_read_lock(); - dev = mlx4_get_protocol_dev(ibdev->dev, MLX4_PROT_ETH, port_num); + for_each_netdev_rcu(&init_net, dev) { + if (dev->dev.parent != ibdev->ib_dev.dev.parent || + dev->dev_port + 1 != port_num) + continue; - if (dev) { if (mlx4_is_bonded(ibdev->dev)) { struct net_device *upper = NULL; @@ -143,11 +145,14 @@ static struct net_device *mlx4_ib_get_netdev(struct ib_device *device, dev = active; } } + + dev_hold(dev); + ret = dev; + break; } - dev_hold(dev); rcu_read_unlock(); - return dev; + return ret; } static int mlx4_ib_update_gids_v1(struct gid_entry *gids, @@ -2319,61 +2324,53 @@ static void mlx4_ib_update_qps(struct mlx4_ib_dev *ibdev, mutex_unlock(&ibdev->qp1_proxy_lock[port - 1]); } -static void mlx4_ib_scan_netdevs(struct mlx4_ib_dev *ibdev, - struct net_device *dev, - unsigned long event) +static void mlx4_ib_scan_netdev(struct mlx4_ib_dev *ibdev, + struct net_device *dev, + unsigned long event) { - struct mlx4_ib_iboe *iboe; - int update_qps_port = -1; - int port; + struct mlx4_ib_iboe *iboe = &ibdev->iboe; ASSERT_RTNL(); - iboe = &ibdev->iboe; + if (dev->dev.parent != ibdev->ib_dev.dev.parent) + return; spin_lock_bh(&iboe->lock); - mlx4_foreach_ib_transport_port(port, ibdev->dev) { - - iboe->netdevs[port - 1] = - mlx4_get_protocol_dev(ibdev->dev, MLX4_PROT_ETH, port); - if (dev == iboe->netdevs[port - 1] && - (event == NETDEV_CHANGEADDR || event == NETDEV_REGISTER || - event == NETDEV_UP || event == NETDEV_CHANGE)) - update_qps_port = port; + iboe->netdevs[dev->dev_port] = event != NETDEV_UNREGISTER ? dev : NULL; - if (dev == iboe->netdevs[port - 1] && - (event == NETDEV_UP || event == NETDEV_DOWN)) { - enum ib_port_state port_state; - struct ib_event ibev = { }; - - if (ib_get_cached_port_state(&ibdev->ib_dev, port, - &port_state)) - continue; + if (event == NETDEV_UP || event == NETDEV_DOWN) { + enum ib_port_state port_state; + struct ib_event ibev = { }; - if (event == NETDEV_UP && - (port_state != IB_PORT_ACTIVE || - iboe->last_port_state[port - 1] != IB_PORT_DOWN)) - continue; - if (event == NETDEV_DOWN && - (port_state != IB_PORT_DOWN || - iboe->last_port_state[port - 1] != IB_PORT_ACTIVE)) - continue; - iboe->last_port_state[port - 1] = port_state; + if (ib_get_cached_port_state(&ibdev->ib_dev, dev->dev_port + 1, + &port_state)) + goto iboe_out; - ibev.device = &ibdev->ib_dev; - ibev.element.port_num = port; - ibev.event = event == NETDEV_UP ? IB_EVENT_PORT_ACTIVE : - IB_EVENT_PORT_ERR; - ib_dispatch_event(&ibev); - } + if (event == NETDEV_UP && + (port_state != IB_PORT_ACTIVE || + iboe->last_port_state[dev->dev_port] != IB_PORT_DOWN)) + goto iboe_out; + if (event == NETDEV_DOWN && + (port_state != IB_PORT_DOWN || + iboe->last_port_state[dev->dev_port] != IB_PORT_ACTIVE)) + goto iboe_out; + iboe->last_port_state[dev->dev_port] = port_state; + ibev.device = &ibdev->ib_dev; + ibev.element.port_num = dev->dev_port + 1; + ibev.event = event == NETDEV_UP ? IB_EVENT_PORT_ACTIVE : + IB_EVENT_PORT_ERR; + ib_dispatch_event(&ibev); } + +iboe_out: spin_unlock_bh(&iboe->lock); - if (update_qps_port > 0) - mlx4_ib_update_qps(ibdev, dev, update_qps_port); + if (event == NETDEV_CHANGEADDR || event == NETDEV_REGISTER || + event == NETDEV_UP || event == NETDEV_CHANGE) + mlx4_ib_update_qps(ibdev, dev, dev->dev_port + 1); } static int mlx4_ib_netdev_event(struct notifier_block *this, @@ -2386,7 +2383,7 @@ static int mlx4_ib_netdev_event(struct notifier_block *this, return NOTIFY_DONE; ibdev = container_of(this, struct mlx4_ib_dev, iboe.nb); - mlx4_ib_scan_netdevs(ibdev, dev, event); + mlx4_ib_scan_netdev(ibdev, dev, event); return NOTIFY_DONE; } diff --git a/drivers/net/ethernet/mellanox/mlx4/en_main.c b/drivers/net/ethernet/mellanox/mlx4/en_main.c index f1259bdb1a29..6a42bec6bd85 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_main.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_main.c @@ -183,13 +183,6 @@ static void mlx4_en_get_profile(struct mlx4_en_dev *mdev) } } -static void *mlx4_en_get_netdev(struct mlx4_dev *dev, void *ctx, u8 port) -{ - struct mlx4_en_dev *endev = ctx; - - return endev->pndev[port]; -} - static void mlx4_en_event(struct mlx4_dev *dev, void *endev_ptr, enum mlx4_dev_event event, unsigned long port) { @@ -354,7 +347,6 @@ static struct mlx4_interface mlx4_en_interface = { .add = mlx4_en_add, .remove = mlx4_en_remove, .event = mlx4_en_event, - .get_dev = mlx4_en_get_netdev, .protocol = MLX4_PROT_ETH, .activate = mlx4_en_activate, }; diff --git a/drivers/net/ethernet/mellanox/mlx4/intf.c b/drivers/net/ethernet/mellanox/mlx4/intf.c index 65482f004e50..28d7da925d36 100644 --- a/drivers/net/ethernet/mellanox/mlx4/intf.c +++ b/drivers/net/ethernet/mellanox/mlx4/intf.c @@ -245,27 +245,6 @@ void mlx4_unregister_device(struct mlx4_dev *dev) mutex_unlock(&intf_mutex); } -void *mlx4_get_protocol_dev(struct mlx4_dev *dev, enum mlx4_protocol proto, int port) -{ - struct mlx4_priv *priv = mlx4_priv(dev); - struct mlx4_device_context *dev_ctx; - unsigned long flags; - void *result = NULL; - - spin_lock_irqsave(&priv->ctx_lock, flags); - - list_for_each_entry(dev_ctx, &priv->ctx_list, list) - if (dev_ctx->intf->protocol == proto && dev_ctx->intf->get_dev) { - result = dev_ctx->intf->get_dev(dev, dev_ctx->context, port); - break; - } - - spin_unlock_irqrestore(&priv->ctx_lock, flags); - - return result; -} -EXPORT_SYMBOL_GPL(mlx4_get_protocol_dev); - struct devlink_port *mlx4_get_devlink_port(struct mlx4_dev *dev, int port) { struct mlx4_port_info *info = &mlx4_priv(dev)->port[port]; diff --git a/include/linux/mlx4/driver.h b/include/linux/mlx4/driver.h index 1834c8fad12e..923951e19300 100644 --- a/include/linux/mlx4/driver.h +++ b/include/linux/mlx4/driver.h @@ -59,7 +59,6 @@ struct mlx4_interface { void (*remove)(struct mlx4_dev *dev, void *context); void (*event) (struct mlx4_dev *dev, void *context, enum mlx4_dev_event event, unsigned long param); - void * (*get_dev)(struct mlx4_dev *dev, void *context, u8 port); void (*activate)(struct mlx4_dev *dev, void *context); struct list_head list; enum mlx4_protocol protocol; @@ -88,8 +87,6 @@ struct mlx4_port_map { int mlx4_port_map_set(struct mlx4_dev *dev, struct mlx4_port_map *v2p); -void *mlx4_get_protocol_dev(struct mlx4_dev *dev, enum mlx4_protocol proto, int port); - struct devlink_port *mlx4_get_devlink_port(struct mlx4_dev *dev, int port); #endif /* MLX4_DRIVER_H */