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| author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2018-01-10 12:25:57 +0000 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-01-10 13:49:35 +0100 |
| commit | ccbdc596f4f6f6795956d46bb4b5f58c7e4bc3c8 (patch) | |
| tree | 15f3d4fd452961906eb5cd078c7ea4b557926a89 /drivers/net/ethernet/netronome/nfp/bpf/main.c | |
| parent | c4f7730be580f8c39decc058246a83ddf7d7b3cb (diff) | |
| download | linux-0-day-ccbdc596f4f6f6795956d46bb4b5f58c7e4bc3c8.tar.gz linux-0-day-ccbdc596f4f6f6795956d46bb4b5f58c7e4bc3c8.tar.xz | |
nfp: bpf: don't allow changing MTU above BPF offload limit when active
When BPF offload is active we need may need to restrict the MTU
changes more than just to the limitation of the kernel XDP datapath.
Allow the BPF code to veto a MTU change.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/bpf/main.c')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/bpf/main.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.c b/drivers/net/ethernet/netronome/nfp/bpf/main.c index 4b63167906ca0..978086580ca01 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/main.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/main.c @@ -195,6 +195,24 @@ static bool nfp_bpf_tc_busy(struct nfp_app *app, struct nfp_net *nn) } static int +nfp_bpf_change_mtu(struct nfp_app *app, struct net_device *netdev, int new_mtu) +{ + struct nfp_net *nn = netdev_priv(netdev); + unsigned int max_mtu; + + if (~nn->dp.ctrl & NFP_NET_CFG_CTRL_BPF) + return 0; + + max_mtu = nn_readb(nn, NFP_NET_CFG_BPF_INL_MTU) * 64 - 32; + if (new_mtu > max_mtu) { + nn_info(nn, "BPF offload active, MTU over %u not supported\n", + max_mtu); + return -EBUSY; + } + return 0; +} + +static int nfp_bpf_parse_cap_adjust_head(struct nfp_app_bpf *bpf, void __iomem *value, u32 length) { @@ -311,6 +329,8 @@ const struct nfp_app_type app_bpf = { .init = nfp_bpf_init, .clean = nfp_bpf_clean, + .change_mtu = nfp_bpf_change_mtu, + .extra_cap = nfp_bpf_extra_cap, .vnic_alloc = nfp_bpf_vnic_alloc, |