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xsk: don't allow umem replace at stack level

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Currently drivers have to check if they already have a umem
installed for a given queue and return an error if so.  Make
better use of XDP_QUERY_XSK_UMEM and move this functionality
to the core.

We need to keep rtnl across the calls now.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Björn Töpel <bjorn.topel@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski
2018-07-30 20:43:53 -07:00
committed by David S. Miller
parent f734607e81
commit 84c6b86875
2 changed files with 32 additions and 12 deletions
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7
include/linux/netdevice.h
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@@ -872,10 +872,10 @@ struct netdev_bpf {
struct {
struct bpf_offloaded_map *offmap;
};
/* XDP_SETUP_XSK_UMEM */
/* XDP_QUERY_XSK_UMEM, XDP_SETUP_XSK_UMEM */
struct {
struct xdp_umem *umem;
u16 queue_id;
struct xdp_umem *umem; /* out for query*/
u16 queue_id; /* in for query */
} xsk;
};
};
@@ -3568,6 +3568,7 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
int fd, u32 flags);
u32 __dev_xdp_query(struct net_device *dev, bpf_op_t xdp_op,
enum bpf_netdev_command cmd);
int xdp_umem_query(struct net_device *dev, u16 queue_id);
int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb);
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb);