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Open Source and information security mailing list archives
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Date: Wed, 25 Jul 2018 18:32:34 +0200
From: John Crispin <john@...ozen.org>
To: Hauke Mehrtens <hauke@...ke-m.de>, davem@...emloft.net
Cc: netdev@...r.kernel.org, andrew@...n.ch,
vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
linux-mips@...ux-mips.org, dev@...sin.me, hauke.mehrtens@...el.com
Subject: Re: [PATCH 4/4] net: dsa: Add Lantiq / Intel DSA driver for vrx200
On 21/07/18 21:13, Hauke Mehrtens wrote:
> +#define MC_ENTRY(val, msk, ns, out, len, type, flags, ipv4_len) \
> + { val, msk, (ns << 10 | out << 4 | len >> 1),\
> + (len & 1) << 15 | type << 13 | flags << 9 | ipv4_len << 8 }
> +static const struct gswip_pce_microcode gswip_pce_microcode[] = {
> + /* value mask ns fields L type flags ipv4_len */
> + MC_ENTRY(0x88c3, 0xFFFF, 1, OUT_ITAG0, 4, INSTR, FLAG_ITAG, 0),
> + MC_ENTRY(0x8100, 0xFFFF, 2, OUT_VTAG0, 2, INSTR, FLAG_VLAN, 0),
> + MC_ENTRY(0x88A8, 0xFFFF, 1, OUT_VTAG0, 2, INSTR, FLAG_VLAN, 0),
> + MC_ENTRY(0x8100, 0xFFFF, 1, OUT_VTAG0, 2, INSTR, FLAG_VLAN, 0),
> + MC_ENTRY(0x8864, 0xFFFF, 17, OUT_ETHTYP, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0800, 0xFFFF, 21, OUT_ETHTYP, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x86DD, 0xFFFF, 22, OUT_ETHTYP, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x8863, 0xFFFF, 16, OUT_ETHTYP, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0xF800, 10, OUT_NONE, 0, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 40, OUT_ETHTYP, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0600, 0x0600, 40, OUT_ETHTYP, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 12, OUT_NONE, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0xAAAA, 0xFFFF, 14, OUT_NONE, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0300, 0xFF00, 41, OUT_NONE, 0, INSTR, FLAG_SNAP, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_DIP7, 3, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 18, OUT_DIP7, 3, INSTR, FLAG_PPPOE, 0),
> + MC_ENTRY(0x0021, 0xFFFF, 21, OUT_NONE, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0057, 0xFFFF, 22, OUT_NONE, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 40, OUT_NONE, 0, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x4000, 0xF000, 24, OUT_IP0, 4, INSTR, FLAG_IPV4, 1),
> + MC_ENTRY(0x6000, 0xF000, 27, OUT_IP0, 3, INSTR, FLAG_IPV6, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 25, OUT_IP3, 2, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 26, OUT_SIP0, 4, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 40, OUT_NONE, 0, LENACCU, FLAG_NO, 0),
> + MC_ENTRY(0x1100, 0xFF00, 39, OUT_PROT, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0600, 0xFF00, 39, OUT_PROT, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0xFF00, 33, OUT_IP3, 17, INSTR, FLAG_HOP, 0),
> + MC_ENTRY(0x2B00, 0xFF00, 33, OUT_IP3, 17, INSTR, FLAG_NN1, 0),
> + MC_ENTRY(0x3C00, 0xFF00, 33, OUT_IP3, 17, INSTR, FLAG_NN2, 0),
> + MC_ENTRY(0x0000, 0x0000, 39, OUT_PROT, 1, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x00E0, 35, OUT_NONE, 0, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 40, OUT_NONE, 0, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0xFF00, 33, OUT_NONE, 0, IPV6, FLAG_HOP, 0),
> + MC_ENTRY(0x2B00, 0xFF00, 33, OUT_NONE, 0, IPV6, FLAG_NN1, 0),
> + MC_ENTRY(0x3C00, 0xFF00, 33, OUT_NONE, 0, IPV6, FLAG_NN2, 0),
> + MC_ENTRY(0x0000, 0x0000, 40, OUT_PROT, 1, IPV6, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 40, OUT_SIP0, 16, INSTR, FLAG_NO, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_APP0, 4, INSTR, FLAG_IGMP, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> + MC_ENTRY(0x0000, 0x0000, 41, OUT_NONE, 0, INSTR, FLAG_END, 0),
> +};
i extracted this struct/blob/voodoo from UGW3/4 7 years ago and was
puzzled by it. for those of us that have worked with this table in the
past, its semi understandable, yet its almost like a blackbox FW blob.
can we try to make it a little more readable by adding a comment on each
line explaining why its there and what it does ?
John
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