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nfp: dumpspec TLV traversal

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- Perform dumpspec traversals for calculating size and populating the
  dump.
- Initially, wrap all spec TLVs in dump error TLVs (changed by later
  patches in the series).

Signed-off-by: Carl Heymann <carl.heymann@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Carl Heymann 2017-12-04 23:34:15 +01:00 committed by David S. Miller
parent f7852b8e9e
commit f3682c7866
1 changed files with 153 additions and 1 deletions
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154
drivers/net/ethernet/netronome/nfp/nfp_net_debugdump.c
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@ -44,6 +44,7 @@
enum nfp_dumpspec_type {
NFP_DUMPSPEC_TYPE_PROLOG = 10000,
NFP_DUMPSPEC_TYPE_ERROR = 10001,
};
/* The following structs must be carefully aligned so that they can be used to
@ -63,6 +64,19 @@ struct nfp_dump_prolog {
__be32 dump_level;
};
struct nfp_dump_error {
struct nfp_dump_tl tl;
__be32 error;
char padding[4];
char spec[0];
};
/* to track state through debug size calculation TLV traversal */
struct nfp_level_size {
u32 requested_level; /* input */
u32 total_size; /* output */
};
/* to track state during debug dump creation TLV traversal */
struct nfp_dump_state {
u32 requested_level; /* input param */
@ -71,6 +85,43 @@ struct nfp_dump_state {
void *p; /* current point in dump buffer */
};
typedef int (*nfp_tlv_visit)(struct nfp_pf *pf, struct nfp_dump_tl *tl,
void *param);
static int
nfp_traverse_tlvs(struct nfp_pf *pf, void *data, u32 data_length, void *param,
nfp_tlv_visit tlv_visit)
{
long long remaining = data_length;
struct nfp_dump_tl *tl;
u32 total_tlv_size;
void *p = data;
int err;
while (remaining >= sizeof(*tl)) {
tl = p;
if (!tl->type && !tl->length)
break;
if (be32_to_cpu(tl->length) > remaining - sizeof(*tl))
return -EINVAL;
total_tlv_size = sizeof(*tl) + be32_to_cpu(tl->length);
/* Spec TLVs should be aligned to 4 bytes. */
if (total_tlv_size % 4 != 0)
return -EINVAL;
p += total_tlv_size;
remaining -= total_tlv_size;
err = tlv_visit(pf, tl, param);
if (err)
return err;
}
return 0;
}
struct nfp_dumpspec *
nfp_net_dump_load_dumpspec(struct nfp_cpp *cpp, struct nfp_rtsym_table *rtbl)
{
@ -104,10 +155,55 @@ nfp_net_dump_load_dumpspec(struct nfp_cpp *cpp, struct nfp_rtsym_table *rtbl)
return dumpspec;
}
static int nfp_dump_error_tlv_size(struct nfp_dump_tl *spec)
{
return ALIGN8(sizeof(struct nfp_dump_error) + sizeof(*spec) +
be32_to_cpu(spec->length));
}
static int
nfp_add_tlv_size(struct nfp_pf *pf, struct nfp_dump_tl *tl, void *param)
{
u32 *size = param;
switch (be32_to_cpu(tl->type)) {
default:
*size += nfp_dump_error_tlv_size(tl);
break;
}
return 0;
}
static int
nfp_calc_specific_level_size(struct nfp_pf *pf, struct nfp_dump_tl *dump_level,
void *param)
{
struct nfp_level_size *lev_sz = param;
if (be32_to_cpu(dump_level->type) != lev_sz->requested_level)
return 0;
return nfp_traverse_tlvs(pf, dump_level->data,
be32_to_cpu(dump_level->length),
&lev_sz->total_size, nfp_add_tlv_size);
}
s64 nfp_net_dump_calculate_size(struct nfp_pf *pf, struct nfp_dumpspec *spec,
u32 flag)
{
return ALIGN8(sizeof(struct nfp_dump_prolog));
struct nfp_level_size lev_sz;
int err;
lev_sz.requested_level = flag;
lev_sz.total_size = ALIGN8(sizeof(struct nfp_dump_prolog));
err = nfp_traverse_tlvs(pf, spec->data, spec->size, &lev_sz,
nfp_calc_specific_level_size);
if (err)
return err;
return lev_sz.total_size;
}
static int nfp_add_tlv(u32 type, u32 total_tlv_sz, struct nfp_dump_state *dump)
@ -129,6 +225,57 @@ static int nfp_add_tlv(u32 type, u32 total_tlv_sz, struct nfp_dump_state *dump)
return 0;
}
static int
nfp_dump_error_tlv(struct nfp_dump_tl *spec, int error,
struct nfp_dump_state *dump)
{
struct nfp_dump_error *dump_header = dump->p;
u32 total_spec_size, total_size;
int err;
total_spec_size = sizeof(*spec) + be32_to_cpu(spec->length);
total_size = ALIGN8(sizeof(*dump_header) + total_spec_size);
err = nfp_add_tlv(NFP_DUMPSPEC_TYPE_ERROR, total_size, dump);
if (err)
return err;
dump_header->error = cpu_to_be32(error);
memcpy(dump_header->spec, spec, total_spec_size);
return 0;
}
static int
nfp_dump_for_tlv(struct nfp_pf *pf, struct nfp_dump_tl *tl, void *param)
{
struct nfp_dump_state *dump = param;
int err;
switch (be32_to_cpu(tl->type)) {
default:
err = nfp_dump_error_tlv(tl, -EOPNOTSUPP, dump);
if (err)
return err;
}
return 0;
}
static int
nfp_dump_specific_level(struct nfp_pf *pf, struct nfp_dump_tl *dump_level,
void *param)
{
struct nfp_dump_state *dump = param;
if (be32_to_cpu(dump_level->type) != dump->requested_level)
return 0;
return nfp_traverse_tlvs(pf, dump_level->data,
be32_to_cpu(dump_level->length), dump,
nfp_dump_for_tlv);
}
static int nfp_dump_populate_prolog(struct nfp_dump_state *dump)
{
struct nfp_dump_prolog *prolog = dump->p;
@ -161,6 +308,11 @@ int nfp_net_dump_populate_buffer(struct nfp_pf *pf, struct nfp_dumpspec *spec,
if (err)
return err;
err = nfp_traverse_tlvs(pf, spec->data, spec->size, &dump,
nfp_dump_specific_level);
if (err)
return err;
/* Set size of actual dump, to trigger warning if different from
* calculated size.
*/