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66 lines
2.1 KiB
Diff
66 lines
2.1 KiB
Diff
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From 04c825484d6ecdcc8ce09b350235c9077eaca6e3 Mon Sep 17 00:00:00 2001
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From: John Crispin <john@phrozen.org>
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Date: Wed, 9 Aug 2017 08:20:21 +0200
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Subject: [PATCH 41/57] net-next: dsa: fix flow dissection
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RPS and probably other kernel features are currently broken on some if not
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all DSA devices. The root cause of this is that skb_hash will call the
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flow_dissector. At this point the skb still contains the magic switch
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header and the skb->protocol field is not set up to the correct 802.3
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value yet. By the time the tag specific code is called, removing the header
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and =roperly setting the protocol an invalid hash is already set. In the
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case of the mt7530 this will result in all flows always having the same
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hash.
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This patch makes the flow dissector honour the nh and protocol offset
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defined by the dsa tag driver thus fixing dissection, hashing and RPS.
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Signed-off-by: John Crispin <john@phrozen.org>
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---
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net/core/flow_dissector.c | 14 +++++++++++++-
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1 file changed, 13 insertions(+), 1 deletion(-)
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--- a/net/core/flow_dissector.c
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+++ b/net/core/flow_dissector.c
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@@ -4,6 +4,7 @@
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/if_vlan.h>
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+#include <net/dsa.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/gre.h>
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@@ -123,13 +124,23 @@ bool __skb_flow_dissect(const struct sk_
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bool skip_vlan = false;
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u8 ip_proto = 0;
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bool ret;
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-
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if (!data) {
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data = skb->data;
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proto = skb_vlan_tag_present(skb) ?
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skb->vlan_proto : skb->protocol;
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nhoff = skb_network_offset(skb);
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hlen = skb_headlen(skb);
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+ if (unlikely(netdev_uses_dsa(skb->dev))) {
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+ const struct dsa_device_ops *ops;
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+ int offset;
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+
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+ ops = skb->dev->dsa_ptr->tag_ops;
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+ if (ops->flow_dissect &&
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+ !ops->flow_dissect(skb, &proto, &offset)) {
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+ hlen -= offset;
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+ nhoff += offset;
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+ }
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+ }
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}
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/* It is ensured by skb_flow_dissector_init() that control key will
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@@ -162,6 +173,7 @@ again:
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case htons(ETH_P_IP): {
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const struct iphdr *iph;
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struct iphdr _iph;
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+
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ip:
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iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
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if (!iph || iph->ihl < 5)
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