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nfp: support variable NSP response lengths

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We want to support extendable commands, where newer versions
of the management FW may provide more information.  Zero out
the communication buffer before passing control to NSP.  This
way if management FW is old and only fills in first N bytes,
the remaining ones will be zeros which extended ABI fields
should reserve as not supported/not available.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-05-28 17:52:59 -07:00 committed by David S. Miller
parent 2ed4b36d03
commit a87853f383
1 changed files with 8 additions and 0 deletions
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8
drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
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@ -419,6 +419,14 @@ static int nfp_nsp_command_buf(struct nfp_nsp *nsp, u16 code, u32 option,
if (err < 0)
return err;
}
/* Zero out remaining part of the buffer */
if (out_buf && out_size && out_size > in_size) {
memset(out_buf, 0, out_size - in_size);
err = nfp_cpp_write(cpp, cpp_id, cpp_buf + in_size,
out_buf, out_size - in_size);
if (err < 0)
return err;
}
ret = nfp_nsp_command(nsp, code, option, cpp_id, cpp_buf);
if (ret < 0)