netdev - Re: [RFC PATCH v3 net-next 03/11] net: ethernet: ti: cpsw: ale: add functions to modify VLANs/MDBs

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Date:   Fri, 26 Apr 2019 13:53:41 +0300
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Grygorii Strashko <grygorii.strashko@...com>,
        netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        "David S . Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...nulli.us>,
        Florian Fainelli <f.fainelli@...il.com>,
        Sekhar Nori <nsekhar@...com>, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, Murali Karicheri <m-karicheri2@...com>,
        Ivan Vecera <ivecera@...hat.com>
Subject: Re: [RFC PATCH v3 net-next 03/11] net: ethernet: ti: cpsw: ale: add
 functions to modify VLANs/MDBs

Hi Ivan,

> >}
> >
> >+static int cpsw_ale_read_mc(struct cpsw_ale *ale, u8 *addr, int flags, u16 vid)
> See below.
> 
Yes
> >+{
> >+	u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
> >+	int idx;
> >+
> >+	idx = cpsw_ale_match_addr(ale, addr, (flags & ALE_VLAN) ? vid : 0);
> >+	if (idx >= 0)
> >+		cpsw_ale_read(ale, idx, ale_entry);
> >+
> >+	return cpsw_ale_get_port_mask(ale_entry, ale->port_mask_bits);
> >+}
> >+
> >+int cpsw_ale_mcast_add_modify(struct cpsw_ale *ale, u8 *addr, int port_mask,
> >+			      int flags, u16 vid, int mcast_state)
> >+{
> >+	int mcast_members, ret;
> >+
> >+	mcast_members = cpsw_ale_read_mc(ale, addr, flags, vid) | port_mask;
> >+	ret = cpsw_ale_add_mcast(ale, addr, mcast_members, flags, vid,
> >+				 mcast_state);
> By fact, cpsw_ale_add_mcast() is doing modify itself already, just name is
> different.
> 
> These 3 func duplicate the existent functionality as result code is done twice.
> Better remove/combine them and rename existent ones, like:
> cpsw_ale_add_mcast() -> cpsw_ale_add_mcast_modify()
> cpsw_ale_del_mcast() -> cpsw_ale_del_mcast_modify()
> 
Yes this is correct. The reason the duplication exists is that this was
originally coded on top of the current cpsw code. So i didn't want to change any
part of the working driver. 
Since we are re-working a bunch of stuff now this makes sense

> >+
> >+	return ret;
> >+}
> >+
> >+int cpsw_ale_mcast_del_modify(struct cpsw_ale *ale, u8 *addr, int port_mask,
> >+			      int flags, u16 vid)
> See above.
and yes :)
> 
> >+{
> >+	int mcast_members, ret;
> >+	int idx;
> >+
> >+	mcast_members = cpsw_ale_read_mc(ale, addr, flags, vid) & ~port_mask;
> >+	idx = cpsw_ale_match_addr(ale, addr, (flags & ALE_VLAN) ? vid : 0);
> >+	if (idx < 0)
> >+		return 0;
> >+	ret = cpsw_ale_del_mcast(ale, addr, mcast_members, flags, vid);
> >+
> >+	return ret;
> >+}
> >+
 
Regards,
/Ilias