[dpdk-dev] [PATCH v2] net/virtio: cache Rx/Tx offload ability check
Olivier Matz
olivier.matz at 6wind.com
Tue Nov 8 09:43:14 CET 2016
Hi Yuanhan,
On 11/04/2016 03:29 PM, Yuanhan Liu wrote:
> It's not a good idea to do the check of whether Rx/Tx offload is
> enabled at the data path. Instead, we could do the check at init
> stage and store the result, so that we could avoid the check again
> and again at the critical datapath.
>
> Cc: Olivier Matz <olivier.matz at 6wind.com>
> Signed-off-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
> ---
> v2: - rebase on top of the bug fix patches
> - define rx/tx_offload as uint8_t instead of int
>
> drivers/net/virtio/virtio_ethdev.c | 19 +++++++++++++++++++
> drivers/net/virtio/virtio_pci.h | 2 ++
> drivers/net/virtio/virtio_rxtx.c | 31 +++++--------------------------
> 3 files changed, 26 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
> index 1505f67..2adae58 100644
> --- a/drivers/net/virtio/virtio_ethdev.c
> +++ b/drivers/net/virtio/virtio_ethdev.c
> @@ -1188,6 +1188,22 @@ rx_func_get(struct rte_eth_dev *eth_dev)
> eth_dev->rx_pkt_burst = &virtio_recv_pkts;
> }
>
> +static inline int
> +rx_offload_enabled(struct virtio_hw *hw)
> +{
> + return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) ||
> + vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
> + vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6);
> +}
> +
> +static inline int
> +tx_offload_enabled(struct virtio_hw *hw)
> +{
> + return vtpci_with_feature(hw, VIRTIO_NET_F_CSUM) ||
> + vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO4) ||
> + vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO6);
> +}
Do we need these functions to be inlined?
It looks better to do like this, but out of curiosity, do you see a
performance improvement?
Regards,
Olivier
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