/*
* Mausezahn - A fast versatile traffic generator
* Copyright (C) 2008-2010 Herbert Haas
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, see http://www.gnu.org/licenses/gpl-2.0.html
*
*/
#include "mz.h"
#include "mops.h"
// Assigns MPLS tag at position i (starting at zero!) with values:
//
// m ... total number of tags (important to set BoS in last tag)
// Label ... label value
// Exp ... EXP field (typically CoS)
// TTL ... Time To Live
//
// NOTE: Two usage possibilities!
//
// 1.) When called from for-loop to add all tags the total size mpls_s
// is updated continuously and the BoS is set in the last tag.
// Therefore set m = total number of tags!
//
// 2.) But when changing a particular tag within an existing MPLS stack
// the total number of tags does not change, therefore use m=0.
//
// RETURN VALUE: 0 upon success, 1 upon failure
//
int mops_mpls(struct mops *mp, int i, int m, u_int32_t Label, u_int8_t Exp, u_int8_t TTL)
{
u_int8_t *ptr;
if ((m) && (i>=m)) return 1; // label index greater than number of labels!
if (Label > 1048575) return 1;
if (Exp > 7) return 1;
// Create binary tag: Label(20) EXP(3) BoS(1) TTL(8)
Label <<= 4;
ptr = (u_int8_t *) &Label;
mp->mpls[4*i+0] = *(ptr+2);
mp->mpls[4*i+1] = *(ptr+1);
mp->mpls[4*i+2] = *(ptr+0);
Exp <<= 1;
mp->mpls[4*i+2] |= Exp;
mp->mpls[4*i+3] = TTL;
if ((m) && (i==(m-1))) // reached last tag!
{
mp->mpls[4*i+2] |= 0x01; // set BoS in last tag
mp->mpls_s =4*m;
mp->use_MPLS = 1;
if ( (mp->eth_type != 0x8847) && (mp->eth_type != 0x8848) )
{
mp->eth_type_backup = mp->eth_type;
}
mp->eth_type = 0x8847;
}
return 0;
}
// Remove MPLS tags from packet mp
//
// j indicates which tag to be removed (1..n)
// j=0 means: remove all tags!
//
// RETURN VALUE: 1 upon failure, 0 upon success
int mops_mpls_remove (struct mops *mp, int j)
{
int a, b, k;
if (j==0) // remove all tags
{
if (mp->use_MPLS)
{
mp->mpls_s=0;
mp->use_MPLS=0;
mp->eth_type = mp->eth_type_backup; // restore original ethertype
return 0;
}
else
return 1;
}
k = mp->mpls_s/4;
if (j>k) return 1; // The packet only consists of k tag(s)
if (k==1) // only delete the single tag
{
mp->mpls_s=0;
mp->use_MPLS=0;
mp->eth_type = mp->eth_type_backup; // restore original ethertype
return 0;
}
// if we got here we have more than one tag:
if (j==k) // remove last tag (of several)
{
mp->mpls_s -=4;
return 0;
}
// remove some non-ending tag: 0, 1, 2, 3
a = (j-1)*4; // target
b = j*4; // source (what should be copied)
memcpy(&mp->mpls[a], &mp->mpls[b], (k-j)*4);
mp->mpls_s -=4;
return 0;
}
// Set BOS in tag k where k=1..n
int mops_mpls_bos (struct mops *mp, int k)
{
int n;
n = mp->mpls_s/4; // n = total number of tags
if (k>n) return 1;
mp->mpls[(k-1)*4+2] |= 0x01;
return 0;
}
// Unset BOS in tag k where k=1..n
int mops_mpls_nobos (struct mops *mp, int k)
{
int n;
n = mp->mpls_s/4; // n = total number of tags
if (k>n) return 1;
mp->mpls[(k-1)*4+2] &= 0xfe;
return 0;
}
tr>
Merge tag 'for-linus-20160928' of git://git.infradead.org/linux-mtd
Pull late MTD fixes from Brian Norris:
"Another round of MTD fixes for v4.8
My apologies for sending this so late. I've been fairly absent as a
maintainer this cycle, but I did queue these up weeks ago. In the
meantime, Richard was able to handle some other fixes (thanks!) but
didn't pick these up.
On the bright side, these are very simple changes that should carry
little risk.
Summary:
- Davinci NAND: fix a long-standing bug in how we clear/prep 4-bit ECC
- OMAP NAND: an error-handling fix that made it into v4.8-rc1 caused
error-handling cases in other configurations/code-paths; this fixes
the fix"
* tag 'for-linus-20160928' of git://git.infradead.org/linux-mtd:
mtd: nand: davinci: Reinitialize the HW ECC engine in 4bit hwctl
mtd: nand: omap2: Don't call dma_release_channel() if dma_request_chan() failed