netdev - [net-next PATCH RFC 7/8] xdp: bpf: cpumap redirect must update skb->mem

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Date:   Fri, 07 Dec 2018 00:26:02 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Toke Høiland-Jørgensen <toke@...e.dk>,
        ard.biesheuvel@...aro.org, Jason Wang <jasowang@...hat.com>,
        ilias.apalodimas@...aro.org,
        BjörnTöpel <bjorn.topel@...el.com>,
        w@....eu, Saeed Mahameed <saeedm@...lanox.com>,
        mykyta.iziumtsev@...il.com,
        Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Tariq Toukan <tariqt@...lanox.com>
Subject: [net-next PATCH RFC 7/8] xdp: bpf: cpumap redirect must update
 skb->mem_info

XDP-redirect to CPUMAP is about creating the SKB outside the driver
(and on another CPU) via xdp_frame info. Transfer the xdp_frame mem
info to the new SKB mem_info field.

Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
---
 kernel/bpf/cpumap.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/bpf/cpumap.c b/kernel/bpf/cpumap.c
index 24aac0d0f412..e3e05b6ccc42 100644
--- a/kernel/bpf/cpumap.c
+++ b/kernel/bpf/cpumap.c
@@ -199,6 +199,8 @@ static struct sk_buff *cpu_map_build_skb(struct bpf_cpu_map_entry *rcpu,
 	/* Essential SKB info: protocol and skb->dev */
 	skb->protocol = eth_type_trans(skb, xdpf->dev_rx);
 
+	skb->mem_info = xdpf->mem;
+
 	/* Optional SKB info, currently missing:
 	 * - HW checksum info		(skb->ip_summed)
 	 * - HW RX hash			(skb_set_hash)