From 102740bd9436a3a6ba129af3a48271d794009fa5 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 19 Dec 2017 13:32:13 -0800 Subject: cls_bpf: fix offload assumptions after callback conversion cls_bpf used to take care of tracking what offload state a filter is in, i.e. it would track if offload request succeeded or not. This information would then be used to issue correct requests to the driver, e.g. requests for statistics only on offloaded filters, removing only filters which were offloaded, using add instead of replace if previous filter was not added etc. This tracking of offload state no longer functions with the new callback infrastructure. There could be multiple entities trying to offload the same filter. Throw out all the tracking and corresponding commands and simply pass to the drivers both old and new bpf program. Drivers will have to deal with offload state tracking by themselves. Fixes: 3f7889c4c79b ("net: sched: cls_bpf: call block callbacks for offload") Signed-off-by: Jakub Kicinski Acked-by: Jiri Pirko Signed-off-by: David S. Miller --- drivers/net/ethernet/netronome/nfp/bpf/main.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) (limited to 'drivers/net/ethernet/netronome') diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.c b/drivers/net/ethernet/netronome/nfp/bpf/main.c index e379b78e86ef..a4cf62ba4604 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/main.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/main.c @@ -110,16 +110,10 @@ static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type, return -EOPNOTSUPP; } - switch (cls_bpf->command) { - case TC_CLSBPF_REPLACE: - return nfp_net_bpf_offload(nn, cls_bpf->prog, true); - case TC_CLSBPF_ADD: - return nfp_net_bpf_offload(nn, cls_bpf->prog, false); - case TC_CLSBPF_DESTROY: - return nfp_net_bpf_offload(nn, NULL, true); - default: + if (cls_bpf->command != TC_CLSBPF_OFFLOAD) return -EOPNOTSUPP; - } + + return nfp_net_bpf_offload(nn, cls_bpf->prog, cls_bpf->oldprog); } static int nfp_bpf_setup_tc_block(struct net_device *netdev, -- cgit v1.2.3 From d3f89b98e391475419ae2d8834813d3ecbb48f67 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 19 Dec 2017 13:32:14 -0800 Subject: nfp: bpf: keep track of the offloaded program After TC offloads were converted to callbacks we have no choice but keep track of the offloaded filter in the driver. The check for nn->dp.bpf_offload_xdp was a stop gap solution to make sure failed TC offload won't disable XDP, it's no longer necessary. nfp_net_bpf_offload() will return -EBUSY on TC vs XDP conflicts. Fixes: 3f7889c4c79b ("net: sched: cls_bpf: call block callbacks for offload") Signed-off-by: Jakub Kicinski Signed-off-by: David S. Miller --- drivers/net/ethernet/netronome/nfp/bpf/main.c | 47 ++++++++++++++++++++++++--- drivers/net/ethernet/netronome/nfp/bpf/main.h | 8 +++++ 2 files changed, 51 insertions(+), 4 deletions(-) (limited to 'drivers/net/ethernet/netronome') diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.c b/drivers/net/ethernet/netronome/nfp/bpf/main.c index a4cf62ba4604..13190aa09faf 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/main.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/main.c @@ -82,10 +82,33 @@ static const char *nfp_bpf_extra_cap(struct nfp_app *app, struct nfp_net *nn) return nfp_net_ebpf_capable(nn) ? "BPF" : ""; } +static int +nfp_bpf_vnic_alloc(struct nfp_app *app, struct nfp_net *nn, unsigned int id) +{ + int err; + + nn->app_priv = kzalloc(sizeof(struct nfp_bpf_vnic), GFP_KERNEL); + if (!nn->app_priv) + return -ENOMEM; + + err = nfp_app_nic_vnic_alloc(app, nn, id); + if (err) + goto err_free_priv; + + return 0; +err_free_priv: + kfree(nn->app_priv); + return err; +} + static void nfp_bpf_vnic_free(struct nfp_app *app, struct nfp_net *nn) { + struct nfp_bpf_vnic *bv = nn->app_priv; + if (nn->dp.bpf_offload_xdp) nfp_bpf_xdp_offload(app, nn, NULL); + WARN_ON(bv->tc_prog); + kfree(bv); } static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type, @@ -93,6 +116,9 @@ static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type, { struct tc_cls_bpf_offload *cls_bpf = type_data; struct nfp_net *nn = cb_priv; + struct bpf_prog *oldprog; + struct nfp_bpf_vnic *bv; + int err; if (type != TC_SETUP_CLSBPF || !tc_can_offload(nn->dp.netdev) || @@ -100,8 +126,6 @@ static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type, cls_bpf->common.protocol != htons(ETH_P_ALL) || cls_bpf->common.chain_index) return -EOPNOTSUPP; - if (nn->dp.bpf_offload_xdp) - return -EBUSY; /* Only support TC direct action */ if (!cls_bpf->exts_integrated || @@ -113,7 +137,22 @@ static int nfp_bpf_setup_tc_block_cb(enum tc_setup_type type, if (cls_bpf->command != TC_CLSBPF_OFFLOAD) return -EOPNOTSUPP; - return nfp_net_bpf_offload(nn, cls_bpf->prog, cls_bpf->oldprog); + bv = nn->app_priv; + oldprog = cls_bpf->oldprog; + + /* Don't remove if oldprog doesn't match driver's state */ + if (bv->tc_prog != oldprog) { + oldprog = NULL; + if (!cls_bpf->prog) + return 0; + } + + err = nfp_net_bpf_offload(nn, cls_bpf->prog, oldprog); + if (err) + return err; + + bv->tc_prog = cls_bpf->prog; + return 0; } static int nfp_bpf_setup_tc_block(struct net_device *netdev, @@ -161,7 +200,7 @@ const struct nfp_app_type app_bpf = { .extra_cap = nfp_bpf_extra_cap, - .vnic_alloc = nfp_app_nic_vnic_alloc, + .vnic_alloc = nfp_bpf_vnic_alloc, .vnic_free = nfp_bpf_vnic_free, .setup_tc = nfp_bpf_setup_tc, diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.h b/drivers/net/ethernet/netronome/nfp/bpf/main.h index 082a15f6dfb5..57b6043177a3 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/main.h +++ b/drivers/net/ethernet/netronome/nfp/bpf/main.h @@ -172,6 +172,14 @@ struct nfp_prog { struct list_head insns; }; +/** + * struct nfp_bpf_vnic - per-vNIC BPF priv structure + * @tc_prog: currently loaded cls_bpf program + */ +struct nfp_bpf_vnic { + struct bpf_prog *tc_prog; +}; + int nfp_bpf_jit(struct nfp_prog *prog); extern const struct bpf_ext_analyzer_ops nfp_bpf_analyzer_ops; -- cgit v1.2.3