netdev - Re: [PATCH net-next v5 10/14] net/smc: Introduce SMCR get linkgroup command

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Date:   Wed, 25 Nov 2020 16:30:34 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Karsten Graul <kgraul@...ux.ibm.com>
Cc:     David Miller <davem@...emloft.net>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Stefan Raspl <raspl@...ux.ibm.com>, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org
Subject: Re: [PATCH net-next v5 10/14] net/smc: Introduce SMCR get linkgroup
 command

On Tue, 24 Nov 2020 18:50:43 +0100 Karsten Graul wrote:
> +static int smc_nl_fill_lgr(struct smc_link_group *lgr,
> +			   struct sk_buff *skb,
> +			   struct netlink_callback *cb)
> +{
> +	char smc_target[SMC_MAX_PNETID_LEN + 1];
> +	struct nlattr *attrs;
> +
> +	attrs = nla_nest_start_noflag(skb, SMC_GEN_LGR_SMCR);
> +	if (!attrs)
> +		goto errout;
> +
> +	if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id)) < 0)
> +		goto errattr;
> +	if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num) < 0)
> +		goto errattr;
> +	if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role) < 0)
> +		goto errattr;
> +	if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type) < 0)
> +		goto errattr;
> +	if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id) < 0)
> +		goto errattr;
> +	memset(smc_target, 0, sizeof(smc_target));

unnecessary

> +	snprintf(smc_target, sizeof(smc_target), "%s", lgr->pnet_id);
> +	if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target) < 0)
> +		goto errattr;
> +
> +	nla_nest_end(skb, attrs);
> +	return 0;
> +errattr:
> +	nla_nest_cancel(skb, attrs);
> +errout:
> +	return -EMSGSIZE;
> +}
> +
> +static int smc_nl_handle_lgr(struct smc_link_group *lgr,
> +			     struct sk_buff *skb,
> +			     struct netlink_callback *cb)
> +{
> +	int rc = 0;

unnecessary init

> +	void *nlh;
> +
> +	nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
> +			  &smc_gen_nl_family, NLM_F_MULTI,
> +			  SMC_NETLINK_GET_LGR_SMCR);
> +	if (!nlh)
> +		return -EMSGSIZE;
> +	rc = smc_nl_fill_lgr(lgr, skb, cb);
> +	if (rc < 0)
> +		goto errout;
> +
> +	genlmsg_end(skb, nlh);
> +	return rc;

smc_nl_fill_lgr() never return positive values (why would it?)
so:

	if (rc)
		...
	...

	return 0;

> +errout:
> +	genlmsg_cancel(skb, nlh);
> +	return rc;
> +}

>  static const struct nla_policy smc_gen_nl_policy[SMC_GEN_MAX + 1] = {
>  	[SMC_GEN_UNSPEC]	= { .type = NLA_UNSPEC, },
>  	[SMC_GEN_SYS_INFO]	= { .type = NLA_NESTED, },
> +	[SMC_GEN_LGR_SMCR]	= { .type = NLA_NESTED, },

not an input attr