netdev - [PATCH bpf-next 8/8] xdp: simplify __bpf_tx_xdp

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Message-Id: <20191218105400.2895-9-bjorn.topel@gmail.com>
Date:   Wed, 18 Dec 2019 11:54:00 +0100
From:   Björn Töpel <bjorn.topel@...il.com>
To:     netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        bpf@...r.kernel.org, davem@...emloft.net,
        jakub.kicinski@...ronome.com, hawk@...nel.org,
        john.fastabend@...il.com, magnus.karlsson@...el.com,
        jonathan.lemon@...il.com
Subject: [PATCH bpf-next 8/8] xdp: simplify __bpf_tx_xdp_map()

From: Björn Töpel <bjorn.topel@...el.com>

The explicit error checking is not needed. Simply return the error
instead.

Signed-off-by: Björn Töpel <bjorn.topel@...el.com>
---
 net/core/filter.c | 33 +++++++--------------------------
 1 file changed, 7 insertions(+), 26 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index d9caa3e57ea1..217af9974c86 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3510,35 +3510,16 @@ xdp_do_redirect_slow(struct net_device *dev, struct xdp_buff *xdp,
 }
 
 static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
-			    struct bpf_map *map,
-			    struct xdp_buff *xdp)
+			    struct bpf_map *map, struct xdp_buff *xdp)
 {
-	int err;
-
 	switch (map->map_type) {
 	case BPF_MAP_TYPE_DEVMAP:
-	case BPF_MAP_TYPE_DEVMAP_HASH: {
-		struct bpf_dtab_netdev *dst = fwd;
-
-		err = dev_map_enqueue(dst, xdp, dev_rx);
-		if (unlikely(err))
-			return err;
-		break;
-	}
-	case BPF_MAP_TYPE_CPUMAP: {
-		struct bpf_cpu_map_entry *rcpu = fwd;
-
-		err = cpu_map_enqueue(rcpu, xdp, dev_rx);
-		if (unlikely(err))
-			return err;
-		break;
-	}
-	case BPF_MAP_TYPE_XSKMAP: {
-		struct xdp_sock *xs = fwd;
-
-		err = __xsk_map_redirect(xs, xdp);
-		return err;
-	}
+	case BPF_MAP_TYPE_DEVMAP_HASH:
+		return dev_map_enqueue(fwd, xdp, dev_rx);
+	case BPF_MAP_TYPE_CPUMAP:
+		return cpu_map_enqueue(fwd, xdp, dev_rx);
+	case BPF_MAP_TYPE_XSKMAP:
+		return __xsk_map_redirect(fwd, xdp);
 	default:
 		break;
 	}
-- 
2.20.1