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net/smc: use the retry mechanism for netlink messages 

When the netlink messages to be sent to the userspace
are too big for a single netlink message, send them in
chunks using the netlink_dump infrastructure. Modify the
smc diag dump code so that it can signal to the netlink_dump
infrastructure that it needs to send more data.

Signed-off-by: Guvenc Gulce <guvenc@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
pull/193/head
Guvenc Gulce 2020-09-10 18:48:28 +02:00 committed by David S. Miller
parent 219d9aef6d
commit 8418cb4065
1 changed files with 23 additions and 7 deletions
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30
net/smc/smc_diag.c
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@ -22,6 +22,15 @@
#include "smc.h"
#include "smc_core.h"
struct smc_diag_dump_ctx {
int pos[2];
};
static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb)
{
return (struct smc_diag_dump_ctx *)cb->ctx;
}
static void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)
{
sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
@ -193,13 +202,15 @@ errout:
}
static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
struct netlink_callback *cb)
struct netlink_callback *cb, int p_type)
{
struct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb);
struct net *net = sock_net(skb->sk);
int snum = cb_ctx->pos[p_type];
struct nlattr *bc = NULL;
struct hlist_head *head;
int rc = 0, num = 0;
struct sock *sk;
int rc = 0;
read_lock(&prot->h.smc_hash->lock);
head = &prot->h.smc_hash->ht;
@ -209,13 +220,18 @@ static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
sk_for_each(sk, head) {
if (!net_eq(sock_net(sk), net))
continue;
if (num < snum)
goto next;
rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
if (rc)
break;
if (rc < 0)
goto out;
next:
num++;
}
out:
read_unlock(&prot->h.smc_hash->lock);
cb_ctx->pos[p_type] = num;
return rc;
}
@ -223,10 +239,10 @@ static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
int rc = 0;
rc = smc_diag_dump_proto(&smc_proto, skb, cb);
rc = smc_diag_dump_proto(&smc_proto, skb, cb, SMCPROTO_SMC);
if (!rc)
rc = smc_diag_dump_proto(&smc_proto6, skb, cb);
return rc;
smc_diag_dump_proto(&smc_proto6, skb, cb, SMCPROTO_SMC6);
return skb->len;
}
static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)