On Fri, Feb 02, 2024 at 01:37:17PM +0200, Louis Peens wrote:
> From: Daniel Basilio <daniel.basilio@xxxxxxxxxxxx>
>
> The 1st and 2nd expansion BAR configuration registers are configured,
> when the driver starts up, in variables 'barcfg_msix_general' and
> 'barcfg_msix_xpb', respectively. The 'LengthSelect' field is ORed in
> from bit 0, which is incorrect. The 'LengthSelect' field should
> start from bit 27.
>
> This has largely gone un-noticed because
> NFP_PCIE_BAR_PCIE2CPP_LengthSelect_32BIT happens to be 0.
>
> Fixes: 4cb584e0ee7d ("nfp: add CPP access core")
> Cc: stable@xxxxxxxxxxxxxxx # 4.11+
> Signed-off-by: Daniel Basilio <daniel.basilio@xxxxxxxxxxxx>
> Signed-off-by: Louis Peens <louis.peens@xxxxxxxxxxxx>
Hi Daniel and Louis,
If I'm reading this right then this is a code-correctness issue
and there is no runtime effect (because 0 is 0 regardless of shifting and
masking).
If so, I'd suggest that this is net-next material.
And, in turn, if so the Fixes tag should be dropped.
> ---
> drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c
> index 33b4c2856316..3f10c5365c80 100644
> --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c
> +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp6000_pcie.c
> @@ -537,11 +537,13 @@ static int enable_bars(struct nfp6000_pcie *nfp, u16 interface)
> const u32 barcfg_msix_general =
> NFP_PCIE_BAR_PCIE2CPP_MapType(
> NFP_PCIE_BAR_PCIE2CPP_MapType_GENERAL) |
> - NFP_PCIE_BAR_PCIE2CPP_LengthSelect_32BIT;
> + NFP_PCIE_BAR_PCIE2CPP_LengthSelect(
> + NFP_PCIE_BAR_PCIE2CPP_LengthSelect_32BIT);
> const u32 barcfg_msix_xpb =
> NFP_PCIE_BAR_PCIE2CPP_MapType(
> NFP_PCIE_BAR_PCIE2CPP_MapType_BULK) |
> - NFP_PCIE_BAR_PCIE2CPP_LengthSelect_32BIT |
> + NFP_PCIE_BAR_PCIE2CPP_LengthSelect(
> + NFP_PCIE_BAR_PCIE2CPP_LengthSelect_32BIT) |
> NFP_PCIE_BAR_PCIE2CPP_Target_BaseAddress(
> NFP_CPP_TARGET_ISLAND_XPB);
> const u32 barcfg_explicit[4] = {
> --
> 2.34.1
>
>
