netdev - [PATCH net-next 2/5] mlxsw: spectrum_fid: Make flood index calculation more robust

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Date:   Sun, 25 Nov 2018 09:43:55 +0000
From:   Ido Schimmel <idosch@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>,
        Petr Machata <petrm@...lanox.com>, mlxsw <mlxsw@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next 2/5] mlxsw: spectrum_fid: Make flood index
 calculation more robust

802.1D FIDs use a per-FID flood table, where the flood index into the
table is calculated by subtracting 4K from the FID's index.

Currently, 802.1D FIDs start at 4K, so the calculation is correct, but
if it was ever to change, the calculation will no longer be correct.

In addition, this change will allow us to reuse the flood index
calculation function in the next patch, where we are going to emulate
802.1Q FIDs using 802.1D FIDs.

Signed-off-by: Ido Schimmel <idosch@...lanox.com>
Reviewed-by: Petr Machata <petrm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
index 5008bf63d73b..e1739cda25cb 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c
@@ -607,7 +607,7 @@ mlxsw_sp_fid_8021d_compare(const struct mlxsw_sp_fid *fid, const void *arg)
 
 static u16 mlxsw_sp_fid_8021d_flood_index(const struct mlxsw_sp_fid *fid)
 {
-	return fid->fid_index - fid->fid_family->start_index;
+	return fid->fid_index - VLAN_N_VID;
 }
 
 static int mlxsw_sp_port_vp_mode_trans(struct mlxsw_sp_port *mlxsw_sp_port)
-- 
2.19.1