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

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Message-ID: <20190426104156.GA2796@khorivan>
Date:   Fri, 26 Apr 2019 13:41:57 +0300
From:   Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     netdev@...r.kernel.org,
        Ilias Apalodimas <ilias.apalodimas@...aro.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

On Thu, Apr 25, 2019 at 01:24:19AM +0300, Grygorii Strashko wrote:
>From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
>
>A following patch introduces switchdev functionality. Add functions
>to cpsw ALE engine to modify VLANs/MDBs
>
>Signed-off-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
>Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
>---
> drivers/net/ethernet/ti/cpsw_ale.c | 179 ++++++++++++++++++++++++++++-
> drivers/net/ethernet/ti/cpsw_ale.h |  10 ++
> 2 files changed, 187 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/net/ethernet/ti/cpsw_ale.c b/drivers/net/ethernet/ti/cpsw_ale.c
>index d09768368dbd..add3f6e4917b 100644
>--- a/drivers/net/ethernet/ti/cpsw_ale.c
>+++ b/drivers/net/ethernet/ti/cpsw_ale.c
>@@ -400,6 +400,45 @@ int cpsw_ale_del_mcast(struct cpsw_ale *ale, const u8 *addr, int port_mask,
> 	return 0;
> }
>
>+static int cpsw_ale_read_mc(struct cpsw_ale *ale, u8 *addr, int flags, u16 vid)
See below.

>+{
>+	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()

>+
>+	return ret;
>+}
>+
>+int cpsw_ale_mcast_del_modify(struct cpsw_ale *ale, u8 *addr, int port_mask,
>+			      int flags, u16 vid)
See above.

>+{
>+	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,
Ivan Khoronzhuk