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mlxsw: core: Add support for using SKB control buffer

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The SKB control buffer is useful (and used) for bookkeeping of information
related to that SKB. Add helpers so that the mlxsw driver(s) can safely use
the buffer as well. The structure is currently empty, individual users will
add members to it as necessary.

Note that SKB allocation functions already clear the buffer, so the cleanup
is only necessary when ndo_start_xmit is called.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2019-06-30 09:04:52 +03:00 committed by David S. Miller
parent aed4b57211
commit d7cd206dbf
3 changed files with 13 additions and 0 deletions
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9
drivers/net/ethernet/mellanox/mlxsw/core.h
View File

@ -418,4 +418,13 @@ enum mlxsw_devlink_param_id {
MLXSW_DEVLINK_PARAM_ID_ACL_REGION_REHASH_INTERVAL,
};
struct mlxsw_skb_cb {
};
static inline struct mlxsw_skb_cb *mlxsw_skb_cb(struct sk_buff *skb)
{
BUILD_BUG_ON(sizeof(mlxsw_skb_cb) > sizeof(skb->cb));
return (struct mlxsw_skb_cb *) skb->cb;
}
#endif

2
drivers/net/ethernet/mellanox/mlxsw/spectrum.c
View File

@ -790,6 +790,8 @@ static netdev_tx_t mlxsw_sp_port_xmit(struct sk_buff *skb,
u64 len;
int err;
memset(skb->cb, 0, sizeof(struct mlxsw_skb_cb));
if (mlxsw_core_skb_transmit_busy(mlxsw_sp->core, &tx_info))
return NETDEV_TX_BUSY;

2
drivers/net/ethernet/mellanox/mlxsw/switchx2.c
View File

@ -299,6 +299,8 @@ static netdev_tx_t mlxsw_sx_port_xmit(struct sk_buff *skb,
u64 len;
int err;
memset(skb->cb, 0, sizeof(struct mlxsw_skb_cb));
if (mlxsw_core_skb_transmit_busy(mlxsw_sx->core, &tx_info))
return NETDEV_TX_BUSY;