net: dsa: create a helper which allocates space for EtherType DSA headers

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Hide away the memmove used by DSA EtherType header taggers to shift the
MAC SA and DA to the left to make room for the header, after they've
called skb_push(). The call to skb_push() is still left explicit in
drivers, to be symmetric with dsa_strip_etype_header, and because not
all callers can be refactored to do it (for example, brcm_tag_xmit_ll
has common code for a pre-Ethernet DSA tag and an EtherType DSA tag).

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Vladimir Oltean 2021-08-10 16:13:54 +03:00 • committed by David S. Miller

parent f1dacd7aea

commit 6bef794da6

8 changed files with 38 additions and 10 deletions

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29

net/dsa/dsa_priv.h

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4

net/dsa/tag_brcm.c

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4

net/dsa/tag_dsa.c

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2

net/dsa/tag_lan9303.c

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net/dsa/tag_mtk.c

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net/dsa/tag_qca.c

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net/dsa/tag_rtl4_a.c

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net/dsa/tag_sja1105.c

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