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xdp: Provide extack messages when prog attachment failed

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In order to provide more meaningful messages to user when the process of
loading xdp program onto network interface failed, let's add extack
messages within dev_change_xdp_fd.

Suggested-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Maciej Fijalkowski 2019-02-01 22:42:27 +01:00 committed by Daniel Borkmann
parent 6a5457618f
commit 01dde20ce0
1 changed files with 9 additions and 3 deletions
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12
net/core/dev.c
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@ -7983,8 +7983,10 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
query = flags & XDP_FLAGS_HW_MODE ? XDP_QUERY_PROG_HW : XDP_QUERY_PROG;
bpf_op = bpf_chk = ops->ndo_bpf;
if (!bpf_op && (flags & (XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE)))
if (!bpf_op && (flags & (XDP_FLAGS_DRV_MODE | XDP_FLAGS_HW_MODE))) {
NL_SET_ERR_MSG(extack, "underlying driver does not support XDP in native mode");
return -EOPNOTSUPP;
}
if (!bpf_op || (flags & XDP_FLAGS_SKB_MODE))
bpf_op = generic_xdp_install;
if (bpf_op == bpf_chk)
@ -7992,11 +7994,15 @@ int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack,
if (fd >= 0) {
if (__dev_xdp_query(dev, bpf_chk, XDP_QUERY_PROG) ||
__dev_xdp_query(dev, bpf_chk, XDP_QUERY_PROG_HW))
__dev_xdp_query(dev, bpf_chk, XDP_QUERY_PROG_HW)) {
NL_SET_ERR_MSG(extack, "native and generic XDP can't be active at the same time");
return -EEXIST;
}
if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) &&
__dev_xdp_query(dev, bpf_op, query))
__dev_xdp_query(dev, bpf_op, query)) {
NL_SET_ERR_MSG(extack, "XDP program already attached");
return -EBUSY;
}
prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP,
bpf_op == ops->ndo_bpf);