netdev - [PATCH bpf-next v2 06/15] bpf: offload: factor out netdev checking at allocation time

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Message-Id: <20180112042917.10348-7-jakub.kicinski@netronome.com>
Date:   Thu, 11 Jan 2018 20:29:08 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     alexei.starovoitov@...il.com, daniel@...earbox.net,
        davem@...emloft.net
Cc:     netdev@...r.kernel.org, oss-drivers@...ronome.com, tehnerd@...com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH bpf-next v2 06/15] bpf: offload: factor out netdev checking at allocation time

Add a helper to check if netdev could be found and whether it
has .ndo_bpf callback.  There is no need to check the callback
every time it's invoked, ndos can't reasonably be swapped for
a set without .ndp_bpf while program is loaded.

bpf_dev_offload_check() will also be used by map offload.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>
---
 kernel/bpf/offload.c | 28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 001ddfde7874..cdd1e19a668b 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -30,9 +30,19 @@
 static DECLARE_RWSEM(bpf_devs_lock);
 static LIST_HEAD(bpf_prog_offload_devs);
 
+static int bpf_dev_offload_check(struct net_device *netdev)
+{
+	if (!netdev)
+		return -EINVAL;
+	if (!netdev->netdev_ops->ndo_bpf)
+		return -EOPNOTSUPP;
+	return 0;
+}
+
 int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr)
 {
 	struct bpf_prog_offload *offload;
+	int err;
 
 	if (attr->prog_type != BPF_PROG_TYPE_SCHED_CLS &&
 	    attr->prog_type != BPF_PROG_TYPE_XDP)
@@ -49,12 +59,15 @@ int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr)
 
 	offload->netdev = dev_get_by_index(current->nsproxy->net_ns,
 					   attr->prog_ifindex);
-	if (!offload->netdev)
-		goto err_free;
+	err = bpf_dev_offload_check(offload->netdev);
+	if (err)
+		goto err_maybe_put;
 
 	down_write(&bpf_devs_lock);
-	if (offload->netdev->reg_state != NETREG_REGISTERED)
+	if (offload->netdev->reg_state != NETREG_REGISTERED) {
+		err = -EINVAL;
 		goto err_unlock;
+	}
 	prog->aux->offload = offload;
 	list_add_tail(&offload->offloads, &bpf_prog_offload_devs);
 	dev_put(offload->netdev);
@@ -63,10 +76,11 @@ int bpf_prog_offload_init(struct bpf_prog *prog, union bpf_attr *attr)
 	return 0;
 err_unlock:
 	up_write(&bpf_devs_lock);
-	dev_put(offload->netdev);
-err_free:
+err_maybe_put:
+	if (offload->netdev)
+		dev_put(offload->netdev);
 	kfree(offload);
-	return -EINVAL;
+	return err;
 }
 
 static int __bpf_offload_ndo(struct bpf_prog *prog, enum bpf_netdev_command cmd,
@@ -80,8 +94,6 @@ static int __bpf_offload_ndo(struct bpf_prog *prog, enum bpf_netdev_command cmd,
 	if (!offload)
 		return -ENODEV;
 	netdev = offload->netdev;
-	if (!netdev->netdev_ops->ndo_bpf)
-		return -EOPNOTSUPP;
 
 	data->command = cmd;
 
-- 
2.15.1