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/*
* Copyright (C) 2017 Netronome Systems, Inc.
*
* This software is dual licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
* source tree or the BSD 2-Clause License provided below. You have the
* option to license this software under the complete terms of either license.
*
* The BSD 2-Clause License:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/ethtool.h>
#include <linux/vmalloc.h>
#include "nfp_main.h"
#include "nfpcore/nfp.h"
#include "nfpcore/nfp_nffw.h"
#define NFP_DUMP_SPEC_RTSYM "_abi_dump_spec"
#define ALIGN8(x) ALIGN(x, 8)
enum nfp_dumpspec_type {
NFP_DUMPSPEC_TYPE_PROLOG = 10000,
};
/* The following structs must be carefully aligned so that they can be used to
* interpret the binary dumpspec and populate the dump data in a deterministic
* way.
*/
/* generic type plus length */
struct nfp_dump_tl {
__be32 type;
__be32 length; /* chunk length to follow, aligned to 8 bytes */
char data[0];
};
struct nfp_dump_prolog {
struct nfp_dump_tl tl;
__be32 dump_level;
};
/* to track state during debug dump creation TLV traversal */
struct nfp_dump_state {
u32 requested_level; /* input param */
u32 dumped_size; /* adds up to size of dumped data */
u32 buf_size; /* size of buffer pointer to by p */
void *p; /* current point in dump buffer */
};
struct nfp_dumpspec *
nfp_net_dump_load_dumpspec(struct nfp_cpp *cpp, struct nfp_rtsym_table *rtbl)
{
const struct nfp_rtsym *specsym;
struct nfp_dumpspec *dumpspec;
int bytes_read;
u32 cpp_id;
specsym = nfp_rtsym_lookup(rtbl, NFP_DUMP_SPEC_RTSYM);
if (!specsym)
return NULL;
/* expected size of this buffer is in the order of tens of kilobytes */
dumpspec = vmalloc(sizeof(*dumpspec) + specsym->size);
if (!dumpspec)
return NULL;
dumpspec->size = specsym->size;
cpp_id = NFP_CPP_ISLAND_ID(specsym->target, NFP_CPP_ACTION_RW, 0,
specsym->domain);
bytes_read = nfp_cpp_read(cpp, cpp_id, specsym->addr, dumpspec->data,
specsym->size);
if (bytes_read != specsym->size) {
vfree(dumpspec);
nfp_warn(cpp, "Debug dump specification read failed.\n");
return NULL;
}
return dumpspec;
}
s64 nfp_net_dump_calculate_size(struct nfp_pf *pf, struct nfp_dumpspec *spec,
u32 flag)
{
return ALIGN8(sizeof(struct nfp_dump_prolog));
}
static int nfp_add_tlv(u32 type, u32 total_tlv_sz, struct nfp_dump_state *dump)
{
struct nfp_dump_tl *tl = dump->p;
if (total_tlv_sz > dump->buf_size)
return -ENOSPC;
if (dump->buf_size - total_tlv_sz < dump->dumped_size)
return -ENOSPC;
tl->type = cpu_to_be32(type);
tl->length = cpu_to_be32(total_tlv_sz - sizeof(*tl));
dump->dumped_size += total_tlv_sz;
dump->p += total_tlv_sz;
return 0;
}
static int nfp_dump_populate_prolog(struct nfp_dump_state *dump)
{
struct nfp_dump_prolog *prolog = dump->p;
u32 total_size;
int err;
total_size = ALIGN8(sizeof(*prolog));
err = nfp_add_tlv(NFP_DUMPSPEC_TYPE_PROLOG, total_size, dump);
if (err)
return err;
prolog->dump_level = cpu_to_be32(dump->requested_level);
return 0;
}
int nfp_net_dump_populate_buffer(struct nfp_pf *pf, struct nfp_dumpspec *spec,
struct ethtool_dump *dump_param, void *dest)
{
struct nfp_dump_state dump;
int err;
dump.requested_level = dump_param->flag;
dump.dumped_size = 0;
dump.p = dest;
dump.buf_size = dump_param->len;
err = nfp_dump_populate_prolog(&dump);
if (err)
return err;
/* Set size of actual dump, to trigger warning if different from
* calculated size.
*/
dump_param->len = dump.dumped_size;
return 0;
}
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