xdp: propagate extended ack to XDP setup
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>
diff --git a/net/core/dev.c b/net/core/dev.c
index 8371a01..35a06ce 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6854,12 +6854,14 @@ EXPORT_SYMBOL(dev_change_proto_down);
/**
* dev_change_xdp_fd - set or clear a bpf program for a device rx path
* @dev: device
+ * @extact: netlink extended ack
* @fd: new program fd or negative value to clear
* @flags: xdp-related flags
*
* Set or clear a bpf program for a device
*/
-int dev_change_xdp_fd(struct net_device *dev, int fd, u32 flags)
+int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
+ int fd, u32 flags)
{
int (*xdp_op)(struct net_device *dev, struct netdev_xdp *xdp);
const struct net_device_ops *ops = dev->netdev_ops;
@@ -6892,6 +6894,7 @@ int dev_change_xdp_fd(struct net_device *dev, int fd, u32 flags)
memset(&xdp, 0, sizeof(xdp));
xdp.command = XDP_SETUP_PROG;
+ xdp.extack = extack;
xdp.prog = prog;
err = xdp_op(dev, &xdp);
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 9031a6c..6e67315 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -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 @@ static int rtnl_newlink(struct sk_buff *skb, struct nlmsghdr *nlh,
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;
}