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Tue, 3 Mar 2026 14:52:51 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id GOR4K8P1pmmPKQAAD6G6ig (envelope-from ); Tue, 03 Mar 2026 14:52:51 +0000 From: Oliver Neukum To: andrew@lunn.ch, bjorn@mork.no, netdev@vger.kernel.org Cc: Oliver Neukum Subject: [RFCv2 08/13] net: usb: usbnet: allow drivers to specify private space needed Date: Tue, 3 Mar 2026 15:50:28 +0100 Message-ID: <20260303145242.1377514-8-oneukum@suse.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260303145242.1377514-1-oneukum@suse.com> References: <20260303145242.1377514-1-oneukum@suse.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; 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This has led to various constructions in drivers this is not enough space for. Allow minidrivers to tell usbnet how much they need by means of struct driver_info. For backwards compatibility zero is taken to mean enough space for unsigned long[5] Signed-off-by: Oliver Neukum --- drivers/net/usb/qmi_wwan.c | 3 --- drivers/net/usb/sierra_net.c | 3 --- drivers/net/usb/usbnet.c | 5 ++++- include/linux/usb/usbnet.h | 6 +++++- 4 files changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c index 3a4985b582cb..fc2591ccb682 100644 --- a/drivers/net/usb/qmi_wwan.c +++ b/drivers/net/usb/qmi_wwan.c @@ -753,9 +753,6 @@ static int qmi_wwan_bind(struct usbnet *dev, struct usb_interface *intf) struct qmi_wwan_state *info = (void *)&dev->data; struct usb_cdc_parsed_header hdr; - BUILD_BUG_ON((sizeof(((struct usbnet *)0)->data) < - sizeof(struct qmi_wwan_state))); - /* set up initial state */ info->control = intf; info->data = intf; diff --git a/drivers/net/usb/sierra_net.c b/drivers/net/usb/sierra_net.c index 4d3ed642b3e7..5a32796a7a89 100644 --- a/drivers/net/usb/sierra_net.c +++ b/drivers/net/usb/sierra_net.c @@ -855,9 +855,6 @@ static struct sk_buff *sierra_net_tx_fixup(struct usbnet *dev, u16 len; bool need_tail; - BUILD_BUG_ON(sizeof_field(struct usbnet, data) - < sizeof(struct cdc_state)); - dev_dbg(&dev->udev->dev, "%s", __func__); if (priv->link_up && check_ethip_packet(skb, dev) && is_ip(skb)) { /* enough head room as is? */ diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 8a9e0d98d9c6..b3cc3428b342 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1734,6 +1734,7 @@ usbnet_probe(struct usb_interface *udev, const struct usb_device_id *prod) int status; const char *name; struct usb_driver *driver = to_usb_driver(udev->dev.driver); + unsigned int extra; /* usbnet already took usb runtime pm, so have to enable the feature * for usb interface, otherwise usb_autopm_get_interface may return @@ -1756,7 +1757,9 @@ usbnet_probe(struct usb_interface *udev, const struct usb_device_id *prod) status = -ENOMEM; // set up our own records - net = alloc_etherdev(sizeof(*dev)); + extra = info->required_room ? + info->required_room : 5 * sizeof(unsigned long); + net = alloc_etherdev(sizeof(*dev) + extra); if (!net) goto out; diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h index 766862427620..41582346360f 100644 --- a/include/linux/usb/usbnet.h +++ b/include/linux/usb/usbnet.h @@ -50,7 +50,6 @@ struct usbnet { struct net_device *net; int msg_enable; struct cdc_state cdc; /* too common to leave out*/ - unsigned long data[5]; u32 xid; u32 hard_mtu; /* count any extra framing */ size_t rx_urb_size; /* size for rx urbs */ @@ -93,6 +92,8 @@ struct usbnet { * that must be broken */ # define EVENT_UNPLUG 31 + + DECLARE_FLEX_ARRAY(unsigned long, data); }; static inline bool usbnet_going_away(struct usbnet *ubn) @@ -142,6 +143,9 @@ struct driver_info { #define FLAG_RX_ASSEMBLE 0x4000 /* rx packets may span >1 frames */ #define FLAG_NOARP 0x8000 /* device can't do ARP */ + /* tells us how much private space is need in the descriptor */ + unsigned int required_room; + /* init device ... can sleep, or cause probe() failure */ int (*bind)(struct usbnet *, struct usb_interface *); -- 2.53.0