On Jan 18, 2019, at 6:13 AM, Michael Richardson <[email protected]> wrote:
> Guy, do we want to allocate 16 or 32 values, aligned, so that the
> it be can DLT_TAG_BASE + DSA_TAG_xx maps?
"Aligned" would mean you want to support DLT_TAG_BASE | DSA_TAG_xx; alignment
is necessary to support ORing in the tag type, but isn't necessary for adding
the tag type.
> Are the kernel values stable?
Presumably referring to the DSA_TAG_xx values?
Unfortunately, they haven't been; they're in the include/net/dsa.h header in
the kernel source, which *isn't* in the include/uapi tree, so it's not
considered part of the user-mode API and thus is, I think, subject to change,
and, in fact, the numbers differ between, for example, 3.18.10 and 4.20.3.
3.18.10:
enum dsa_tag_protocol {
DSA_TAG_PROTO_NONE = 0,
DSA_TAG_PROTO_DSA,
DSA_TAG_PROTO_TRAILER,
DSA_TAG_PROTO_EDSA,
DSA_TAG_PROTO_BRCM,
};
4.20.3:
enum dsa_tag_protocol {
DSA_TAG_PROTO_NONE = 0,
DSA_TAG_PROTO_BRCM,
DSA_TAG_PROTO_BRCM_PREPEND,
DSA_TAG_PROTO_DSA,
DSA_TAG_PROTO_EDSA,
DSA_TAG_PROTO_GSWIP,
DSA_TAG_PROTO_KSZ,
DSA_TAG_PROTO_LAN9303,
DSA_TAG_PROTO_MTK,
DSA_TAG_PROTO_QCA,
DSA_TAG_PROTO_TRAILER,
DSA_TAG_LAST, /* MUST BE LAST */
};
Whether they're *now* considered stable, so that new protocols will be added
after all existing tags and before DSA_TAG_LAST, is another matter.
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