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nfp: bpf: release the reference on offloaded programs

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The xdp_prog member of the adapter's data path structure is used
for XDP in driver mode.  In case a XDP program is loaded with in
HW-only mode, we need to store it somewhere else.  Add a new XDP
prog pointer in the main structure and use that when we need to
know whether any XDP program is loaded, not only a driver mode
one.  Only release our reference on adapter free instead of
immediately after netdev unregister to allow offload to be disabled
first.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-06-21 18:25:07 -07:00 committed by David S. Miller
parent 9f82fca942
commit 6a8ef5428c
2 changed files with 15 additions and 21 deletions
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2
drivers/net/ethernet/netronome/nfp/nfp_net.h
View File

@ -542,6 +542,7 @@ struct nfp_net_dp {
* @rss_key: RSS secret key
* @rss_itbl: RSS indirection table
* @xdp_flags: Flags with which XDP prog was loaded
* @xdp_prog: XDP prog (for ctrl path, both DRV and HW modes)
* @max_r_vecs: Number of allocated interrupt vectors for RX/TX
* @max_tx_rings: Maximum number of TX rings supported by the Firmware
* @max_rx_rings: Maximum number of RX rings supported by the Firmware
@ -592,6 +593,7 @@ struct nfp_net {
u8 rss_itbl[NFP_NET_CFG_RSS_ITBL_SZ];
u32 xdp_flags;
struct bpf_prog *xdp_prog;
unsigned int max_tx_rings;
unsigned int max_rx_rings;

34
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
View File

@ -3278,15 +3278,10 @@ static int
nfp_net_xdp_setup_drv(struct nfp_net *nn, struct bpf_prog *prog,
struct netlink_ext_ack *extack)
{
struct bpf_prog *old_prog = nn->dp.xdp_prog;
struct nfp_net_dp *dp;
int err;
if (!prog && !nn->dp.xdp_prog)
return 0;
if (prog && nn->dp.xdp_prog) {
prog = xchg(&nn->dp.xdp_prog, prog);
bpf_prog_put(prog);
if (!prog == !nn->dp.xdp_prog) {
WRITE_ONCE(nn->dp.xdp_prog, prog);
return 0;
}
@ -3300,14 +3295,7 @@ nfp_net_xdp_setup_drv(struct nfp_net *nn, struct bpf_prog *prog,
dp->rx_dma_off = prog ? XDP_PACKET_HEADROOM - nn->dp.rx_offset : 0;
/* We need RX reconfig to remap the buffers (BIDIR vs FROM_DEV) */
err = nfp_net_ring_reconfig(nn, dp, extack);
if (err)
return err;
if (old_prog)
bpf_prog_put(old_prog);
return 0;
return nfp_net_ring_reconfig(nn, dp, extack);
}
static int
@ -3317,7 +3305,7 @@ nfp_net_xdp_setup(struct nfp_net *nn, struct bpf_prog *prog, u32 flags,
struct bpf_prog *offload_prog;
int err;
if (nn->dp.xdp_prog && (flags ^ nn->xdp_flags) & XDP_FLAGS_MODES)
if (nn->xdp_prog && (flags ^ nn->xdp_flags) & XDP_FLAGS_MODES)
return -EBUSY;
offload_prog = flags & XDP_FLAGS_DRV_MODE ? NULL : prog;
@ -3327,6 +3315,10 @@ nfp_net_xdp_setup(struct nfp_net *nn, struct bpf_prog *prog, u32 flags,
return err;
nfp_app_xdp_offload(nn->app, nn, offload_prog);
if (nn->xdp_prog)
bpf_prog_put(nn->xdp_prog);
nn->xdp_prog = prog;
nn->xdp_flags = flags;
return 0;
@ -3341,8 +3333,8 @@ static int nfp_net_xdp(struct net_device *netdev, struct netdev_xdp *xdp)
return nfp_net_xdp_setup(nn, xdp->prog, xdp->flags,
xdp->extack);
case XDP_QUERY_PROG:
xdp->prog_attached = !!nn->dp.xdp_prog;
xdp->prog_id = nn->dp.xdp_prog ? nn->dp.xdp_prog->aux->id : 0;
xdp->prog_attached = !!nn->xdp_prog;
xdp->prog_id = nn->xdp_prog ? nn->xdp_prog->aux->id : 0;
return 0;
default:
return -EINVAL;
@ -3500,6 +3492,9 @@ struct nfp_net *nfp_net_alloc(struct pci_dev *pdev, bool needs_netdev,
*/
void nfp_net_free(struct nfp_net *nn)
{
if (nn->xdp_prog)
bpf_prog_put(nn->xdp_prog);
if (nn->dp.netdev)
free_netdev(nn->dp.netdev);
else
@ -3757,7 +3752,4 @@ void nfp_net_clean(struct nfp_net *nn)
return;
unregister_netdev(nn->dp.netdev);
if (nn->dp.xdp_prog)
bpf_prog_put(nn->dp.xdp_prog);
}