linux-kernel - Re: [PATCH net-next v3 2/2] net: vxlan: vxlan_core.c: Add extack support to vxlan_fdb

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Date:   Sun, 24 Apr 2022 20:52:27 +0200
From:   Alaa Mohamed <eng.alaamohamedsoliman.am@...il.com>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     netdev@...r.kernel.org, outreachy@...ts.linux.dev,
        roopa@...dia.com, jdenham@...hat.com, sbrivio@...hat.com,
        jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
        davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        vladimir.oltean@....com, claudiu.manoil@....com,
        alexandre.belloni@...tlin.com, shshaikh@...vell.com,
        manishc@...vell.com, razor@...ckwall.org,
        intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org,
        UNGLinuxDriver@...rochip.com, GR-Linux-NIC-Dev@...vell.com,
        bridge@...ts.linux-foundation.org
Subject: Re: [PATCH net-next v3 2/2] net: vxlan: vxlan_core.c: Add extack
 support to vxlan_fdb_delete


On ٢٤‏/٤‏/٢٠٢٢ ١٨:١٥, Julia Lawall wrote:
>
> On Sun, 24 Apr 2022, Alaa Mohamed wrote:
>
>> Add extack to vxlan_fdb_delete and vxlan_fdb_parse
> It could be helpful to say more about what adding extack support involves.
>
>> Signed-off-by: Alaa Mohamed <eng.alaamohamedsoliman.am@...il.com>
>> ---
>> changes in V2:
>> 	- fix spelling vxlan_fdb_delete
>> 	- add missing braces
>> 	- edit error message
>> ---
>> changes in V3:
>> 	fix errors reported by checkpatch.pl
> But your changes would seem to also be introducing more checkpatch errors,
> because the Linux kernel coding style puts a space before an { at the
> start of an if branch.
I ran checkpatch script before submitting this patch and got no error
>
> julia
>
>> ---
>>   drivers/net/vxlan/vxlan_core.c | 36 +++++++++++++++++++++++-----------
>>   1 file changed, 25 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
>> index cf2f60037340..4e1886655101 100644
>> --- a/drivers/net/vxlan/vxlan_core.c
>> +++ b/drivers/net/vxlan/vxlan_core.c
>> @@ -1129,19 +1129,23 @@ static void vxlan_fdb_dst_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
>>
>>   static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
>>   			   union vxlan_addr *ip, __be16 *port, __be32 *src_vni,
>> -			   __be32 *vni, u32 *ifindex, u32 *nhid)
>> +			   __be32 *vni, u32 *ifindex, u32 *nhid, struct netlink_ext_ack *extack)
>>   {
>>   	struct net *net = dev_net(vxlan->dev);
>>   	int err;
>>
>>   	if (tb[NDA_NH_ID] && (tb[NDA_DST] || tb[NDA_VNI] || tb[NDA_IFINDEX] ||
>> -	    tb[NDA_PORT]))
>> -		return -EINVAL;
>> +	    tb[NDA_PORT])){
>> +			NL_SET_ERR_MSG(extack, "DST, VNI, ifindex and port are mutually exclusive with NH_ID");
>> +			return -EINVAL;
>> +		}
>>
>>   	if (tb[NDA_DST]) {
>>   		err = vxlan_nla_get_addr(ip, tb[NDA_DST]);
>> -		if (err)
>> +		if (err){
>> +			NL_SET_ERR_MSG(extack, "Unsupported address family");
>>   			return err;
>> +		}
>>   	} else {
>>   		union vxlan_addr *remote = &vxlan->default_dst.remote_ip;
>>
>> @@ -1157,24 +1161,30 @@ static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
>>   	}
>>
>>   	if (tb[NDA_PORT]) {
>> -		if (nla_len(tb[NDA_PORT]) != sizeof(__be16))
>> +		if (nla_len(tb[NDA_PORT]) != sizeof(__be16)){
>> +			NL_SET_ERR_MSG(extack, "Invalid vxlan port");
>>   			return -EINVAL;
>> +		}
>>   		*port = nla_get_be16(tb[NDA_PORT]);
>>   	} else {
>>   		*port = vxlan->cfg.dst_port;
>>   	}
>>
>>   	if (tb[NDA_VNI]) {
>> -		if (nla_len(tb[NDA_VNI]) != sizeof(u32))
>> +		if (nla_len(tb[NDA_VNI]) != sizeof(u32)){
>> +			NL_SET_ERR_MSG(extack, "Invalid vni");
>>   			return -EINVAL;
>> +		}
>>   		*vni = cpu_to_be32(nla_get_u32(tb[NDA_VNI]));
>>   	} else {
>>   		*vni = vxlan->default_dst.remote_vni;
>>   	}
>>
>>   	if (tb[NDA_SRC_VNI]) {
>> -		if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32))
>> +		if (nla_len(tb[NDA_SRC_VNI]) != sizeof(u32)){
>> +			NL_SET_ERR_MSG(extack, "Invalid src vni");
>>   			return -EINVAL;
>> +		}
>>   		*src_vni = cpu_to_be32(nla_get_u32(tb[NDA_SRC_VNI]));
>>   	} else {
>>   		*src_vni = vxlan->default_dst.remote_vni;
>> @@ -1183,12 +1193,16 @@ static int vxlan_fdb_parse(struct nlattr *tb[], struct vxlan_dev *vxlan,
>>   	if (tb[NDA_IFINDEX]) {
>>   		struct net_device *tdev;
>>
>> -		if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32))
>> +		if (nla_len(tb[NDA_IFINDEX]) != sizeof(u32)){
>> +			NL_SET_ERR_MSG(extack, "Invalid ifindex");
>>   			return -EINVAL;
>> +		}
>>   		*ifindex = nla_get_u32(tb[NDA_IFINDEX]);
>>   		tdev = __dev_get_by_index(net, *ifindex);
>> -		if (!tdev)
>> +		if (!tdev){
>> +			NL_SET_ERR_MSG(extack,"Device not found");
>>   			return -EADDRNOTAVAIL;
>> +		}
>>   	} else {
>>   		*ifindex = 0;
>>   	}
>> @@ -1226,7 +1240,7 @@ static int vxlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
>>   		return -EINVAL;
>>
>>   	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
>> -			      &nhid);
>> +			      &nhid, extack);
>>   	if (err)
>>   		return err;
>>
>> @@ -1291,7 +1305,7 @@ static int vxlan_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
>>   	int err;
>>
>>   	err = vxlan_fdb_parse(tb, vxlan, &ip, &port, &src_vni, &vni, &ifindex,
>> -			      &nhid);
>> +			      &nhid, extack);
>>   	if (err)
>>   		return err;
>>
>> --
>> 2.36.0
>>
>>
>>