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Date: Mon, 6 Jul 2015 20:46:10 -0700 From: Scott Feldman <sfeldma@...il.com> To: Andrew Lunn <andrew@...n.ch> Cc: Vivien Didelot <vivien.didelot@...oirfairelinux.com>, Netdev <netdev@...r.kernel.org>, "David S. Miller" <davem@...emloft.net>, Jiri Pirko <jiri@...nulli.us>, Florian Fainelli <f.fainelli@...il.com>, Guenter Roeck <linux@...ck-us.net>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, kernel <kernel@...oirfairelinux.com> Subject: Re: [PATCH v3 0/3] net: dsa: mv88e6xxx: add support for VLAN Table Unit On Mon, Jul 6, 2015 at 7:00 PM, Andrew Lunn <andrew@...n.ch> wrote: > On Tue, Jul 07, 2015 at 01:38:04AM +0200, Andrew Lunn wrote: >> On Sun, Jul 05, 2015 at 10:14:50PM -0400, Vivien Didelot wrote: >> > Hi all, >> > >> > This patchset brings full support for hardware VLANs in DSA, and the Marvell >> > 88E6xxx compatible switch chips. >> >> Hi Vivien >> >> I just booted these patches on my board, and i'm getting WARNINGS: >> >> [ 61.111302] WARNING: CPU: 0 PID: 2751 at net/switchdev/switchdev.c:265 switchdev_port_obj_add+0xd4/0xdc() > > Hi Vivien > > I debugged this a bit. > > The problem comes from: > > static int dsa_slave_port_obj_add(struct net_device *dev, > struct switchdev_obj *obj) > { > int err; > > /* > * Skip the prepare phase, since currently the DSA drivers don't need to > * allocate any memory for operations and they will not fail to HW > * (unless something horrible goes wrong on the MDIO bus, in which case > * the prepare phase wouldn't have been able to predict anyway). > */ > if (obj->trans != SWITCHDEV_TRANS_COMMIT) > return 0; > > switch (obj->id) { > case SWITCHDEV_OBJ_PORT_VLAN: > err = dsa_slave_port_vlans_add(dev, obj); > break; > default: > err = -EOPNOTSUPP; > break; > } > > return err; > } > > It is being called with obj->id of 2, which is > SWITCHDEV_OBJ_IPV4_FIB. This function is called twice. The first time > it is with SWITCHDEV_TRANS_PREPARE and we are allowed to return an > error. The second time, with SWITCHDEV_TRANS_COMMIT, errors are not > allowed. > > EOPNOTSUPP is considered an error, so since we don't support > SWITCHDEV_OBJ_IPV4_FIB we error out the COMMIT phase. > > Not sure which is cleaner. Test to see if we support the object during > the prepare, or allow the commit to accept EOPNOTSUPP as not being an > error? I think we should return EOPNOTSUPP on PREPARE, so move the trans != COMMIT test inside the case for PORT_VLAN. That would future-proof the func when new objects are added to switchdev (and not supported by dsa_slave). Does that sound OK? -scott -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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