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nfp: nsp: use fractional size of the buffer

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NSP expresses the buffer size in MB and 4 kB blocks.  For small
buffers the kB part may make a difference, so count it in.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-02-26 20:19:30 -08:00 committed by David S. Miller
parent 1e301a1407
commit 882cdcb5d3
1 changed files with 7 additions and 6 deletions
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13
drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
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@ -49,6 +49,7 @@
#define NSP_DFLT_BUFFER_ADDRESS GENMASK_ULL(39, 0)
#define NSP_DFLT_BUFFER_CONFIG 0x20
#define NSP_DFLT_BUFFER_SIZE_4KB GENMASK_ULL(15, 8)
#define NSP_DFLT_BUFFER_SIZE_MB GENMASK_ULL(7, 0)
#define NSP_MAGIC 0xab10
@ -413,8 +414,8 @@ static int nfp_nsp_command(struct nfp_nsp *state, u16 code)
static int
nfp_nsp_command_buf(struct nfp_nsp *nsp, struct nfp_nsp_command_buf_arg *arg)
{
unsigned int def_size, max_size;
struct nfp_cpp *cpp = nsp->cpp;
unsigned int max_size;
u64 reg, cpp_buf;
int ret, err;
u32 cpp_id;
@ -433,11 +434,11 @@ nfp_nsp_command_buf(struct nfp_nsp *nsp, struct nfp_nsp_command_buf_arg *arg)
return err;
max_size = max(arg->in_size, arg->out_size);
if (FIELD_GET(NSP_DFLT_BUFFER_SIZE_MB, reg) * SZ_1M < max_size) {
nfp_err(cpp, "NSP: default buffer too small for command 0x%04x (%llu < %u)\n",
arg->arg.code,
FIELD_GET(NSP_DFLT_BUFFER_SIZE_MB, reg) * SZ_1M,
max_size);
def_size = FIELD_GET(NSP_DFLT_BUFFER_SIZE_MB, reg) * SZ_1M +
FIELD_GET(NSP_DFLT_BUFFER_SIZE_4KB, reg) * SZ_4K;
if (def_size < max_size) {
nfp_err(cpp, "NSP: default buffer too small for command 0x%04x (%u < %u)\n",
arg->arg.code, def_size, max_size);
return -EINVAL;
}