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rtnetlink: Compute and store minimum ifinfo dump size

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The message size allocated for rtnl ifinfo dumps was limited to
a single page.  This is not enough for additional interface info
available with devices that support SR-IOV and caused a bug in
which VF info would not be displayed if more than approximately
40 VFs were created per interface.

Implement a new function pointer for the rtnl_register service that will
calculate the amount of data required for the ifinfo dump and allocate
enough data to satisfy the request.

Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Greg Rose
2011-06-10 01:27:09 +00:00
committed by Jeff Kirsher
parent 929dd04772
commit c7ac8679be
30 changed files with 158 additions and 90 deletions
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17
net/netlink/af_netlink.c
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@@ -1659,13 +1659,10 @@ static int netlink_dump(struct sock *sk)
{
struct netlink_sock *nlk = nlk_sk(sk);
struct netlink_callback *cb;
struct sk_buff *skb;
struct sk_buff *skb = NULL;
struct nlmsghdr *nlh;
int len, err = -ENOBUFS;
skb = sock_rmalloc(sk, NLMSG_GOODSIZE, 0, GFP_KERNEL);
if (!skb)
goto errout;
int alloc_size;
mutex_lock(nlk->cb_mutex);
@@ -1675,6 +1672,12 @@ static int netlink_dump(struct sock *sk)
goto errout_skb;
}
alloc_size = max_t(int, cb->min_dump_alloc, NLMSG_GOODSIZE);
skb = sock_rmalloc(sk, alloc_size, 0, GFP_KERNEL);
if (!skb)
goto errout;
len = cb->dump(skb, cb);
if (len > 0) {
@@ -1721,7 +1724,8 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
const struct nlmsghdr *nlh,
int (*dump)(struct sk_buff *skb,
struct netlink_callback *),
int (*done)(struct netlink_callback *))
int (*done)(struct netlink_callback *),
u16 min_dump_alloc)
{
struct netlink_callback *cb;
struct sock *sk;
@@ -1735,6 +1739,7 @@ int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
cb->dump = dump;
cb->done = done;
cb->nlh = nlh;
cb->min_dump_alloc = min_dump_alloc;
atomic_inc(&skb->users);
cb->skb = skb;