| Message ID | 20241118041545.1845287-1-yoong.siang.song@intel.com (mailing list archive) |
|---|---|
| State | Awaiting Upstream |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [iwl-next,1/1] igc: Allow hot-swapping XDP program | expand |
On Mon, Nov 18, 2024 at 12:15:45PM +0800, Song Yoong Siang wrote: > Currently, the driver would always close and reopen the network interface > when setting/removing the XDP program, regardless of the presence of XDP > resources. This could cause unnecessary disruptions. > > To avoid this, introduces a check to determine if there is a need to > close and reopen the interface, allowing for seamless hot-swapping of > XDP programs. > > Signed-off-by: Song Yoong Siang <yoong.siang.song@intel.com> Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> > --- > drivers/net/ethernet/intel/igc/igc_xdp.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/ethernet/intel/igc/igc_xdp.c b/drivers/net/ethernet/intel/igc/igc_xdp.c > index e27af72aada8..869815f48ac1 100644 > --- a/drivers/net/ethernet/intel/igc/igc_xdp.c > +++ b/drivers/net/ethernet/intel/igc/igc_xdp.c > @@ -13,6 +13,7 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog, > struct net_device *dev = adapter->netdev; > bool if_running = netif_running(dev); > struct bpf_prog *old_prog; > + bool need_update; > > if (dev->mtu > ETH_DATA_LEN) { > /* For now, the driver doesn't support XDP functionality with > @@ -22,7 +23,8 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog, > return -EOPNOTSUPP; > } > > - if (if_running) > + need_update = !!adapter->xdp_prog != !!prog; > + if (if_running && need_update) > igc_close(dev); > > old_prog = xchg(&adapter->xdp_prog, prog); > @@ -34,7 +36,7 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog, > else > xdp_features_clear_redirect_target(dev); > > - if (if_running) > + if (if_running && need_update) > igc_open(dev); > > return 0; > -- > 2.34.1 > >
diff --git a/drivers/net/ethernet/intel/igc/igc_xdp.c b/drivers/net/ethernet/intel/igc/igc_xdp.c index e27af72aada8..869815f48ac1 100644 --- a/drivers/net/ethernet/intel/igc/igc_xdp.c +++ b/drivers/net/ethernet/intel/igc/igc_xdp.c @@ -13,6 +13,7 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog, struct net_device *dev = adapter->netdev; bool if_running = netif_running(dev); struct bpf_prog *old_prog; + bool need_update; if (dev->mtu > ETH_DATA_LEN) { /* For now, the driver doesn't support XDP functionality with @@ -22,7 +23,8 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog, return -EOPNOTSUPP; } - if (if_running) + need_update = !!adapter->xdp_prog != !!prog; + if (if_running && need_update) igc_close(dev); old_prog = xchg(&adapter->xdp_prog, prog); @@ -34,7 +36,7 @@ int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog, else xdp_features_clear_redirect_target(dev); - if (if_running) + if (if_running && need_update) igc_open(dev); return 0;
Currently, the driver would always close and reopen the network interface when setting/removing the XDP program, regardless of the presence of XDP resources. This could cause unnecessary disruptions. To avoid this, introduces a check to determine if there is a need to close and reopen the interface, allowing for seamless hot-swapping of XDP programs. Signed-off-by: Song Yoong Siang <yoong.siang.song@intel.com> --- drivers/net/ethernet/intel/igc/igc_xdp.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)