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xdp: propagate extended ack to XDP setup

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Drivers usually have a number of restrictions for running XDP
- most common being buffer sizes, LRO and number of rings.
Even though some drivers try to be helpful and print error
messages experience shows that users don't often consult
kernel logs on netlink errors.  Try to use the new extended
ack mechanism to carry the message back to user space.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski
2017-04-30 21:46:46 -07:00
committed by David S. Miller
parent 45d9b378e8
commit ddf9f97076
3 changed files with 20 additions and 8 deletions
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13
net/core/rtnetlink.c
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@@ -1919,6 +1919,7 @@ static int do_set_master(struct net_device *dev, int ifindex)
#define DO_SETLINK_NOTIFY 0x03
static int do_setlink(const struct sk_buff *skb,
struct net_device *dev, struct ifinfomsg *ifm,
struct netlink_ext_ack *extack,
struct nlattr **tb, char *ifname, int status)
{
const struct net_device_ops *ops = dev->netdev_ops;
@@ -2201,7 +2202,7 @@ static int do_setlink(const struct sk_buff *skb,
}
if (xdp[IFLA_XDP_FD]) {
err = dev_change_xdp_fd(dev,
err = dev_change_xdp_fd(dev, extack,
nla_get_s32(xdp[IFLA_XDP_FD]),
xdp_flags);
if (err)
@@ -2261,7 +2262,7 @@ static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err < 0)
goto errout;
err = do_setlink(skb, dev, ifm, tb, ifname, 0);
err = do_setlink(skb, dev, ifm, extack, tb, ifname, 0);
errout:
return err;
}
@@ -2423,6 +2424,7 @@ EXPORT_SYMBOL(rtnl_create_link);
static int rtnl_group_changelink(const struct sk_buff *skb,
struct net *net, int group,
struct ifinfomsg *ifm,
struct netlink_ext_ack *extack,
struct nlattr **tb)
{
struct net_device *dev, *aux;
@@ -2430,7 +2432,7 @@ static int rtnl_group_changelink(const struct sk_buff *skb,
for_each_netdev_safe(net, dev, aux) {
if (dev->group == group) {
err = do_setlink(skb, dev, ifm, tb, NULL, 0);
err = do_setlink(skb, dev, ifm, extack, tb, NULL, 0);
if (err < 0)
return err;
}
@@ -2576,14 +2578,15 @@ replay:
status |= DO_SETLINK_NOTIFY;
}
return do_setlink(skb, dev, ifm, tb, ifname, status);
return do_setlink(skb, dev, ifm, extack, tb, ifname,
status);
}
if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
return rtnl_group_changelink(skb, net,
nla_get_u32(tb[IFLA_GROUP]),
ifm, tb);
ifm, extack, tb);
return -ENODEV;
}