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Date: Mon, 04 Apr 2016 15:32:37 -0700
From: "Samudrala, Sridhar" <sridhar.samudrala@...el.com>
To: Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net
CC: Alexander Duyck <aduyck@...antis.com>, netdev@...r.kernel.org,
nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com
Subject: Re: [net-next 08/14] ixgbe: Add support for generic Tx checksums
On 4/4/2016 3:14 PM, Jeff Kirsher wrote:
> From: Alexander Duyck <aduyck@...antis.com>
>
> This patch adds support for generic Tx checksums to the ixgbe driver. It
> turns out this is actually pretty easy after going over the datasheet as we
> were doing a number of steps we didn't need to.
>
> In order to perform a Tx checksum for an L4 header we need to fill in the
> following fields in the Tx descriptor:
> MACLEN (maximum of 127), retrieved from:
> skb_network_offset()
> IPLEN (maximum of 511), retrieved from:
> skb_checksum_start_offset() - skb_network_offset()
> TUCMD.L4T indicates offset and if checksum or crc32c, based on:
> skb->csum_offset
>
> The added advantage to doing this is that we can support inner checksum
> offloads for tunnels and MPLS while still being able to transparently
> insert VLAN tags.
>
> I also took the opportunity to clean-up many of the feature flag
> configuration bits to make them a bit more consistent between drivers.
>
> Signed-off-by: Alexander Duyck <aduyck@...antis.com>
> Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> ---
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 164 +++++++++-----------------
> 1 file changed, 59 insertions(+), 105 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> index bce5737..8d248c8 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -7202,103 +7202,61 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
> return 1;
> }
>
<snip>
> @@ -9190,41 +9148,37 @@ skip_sriov:
>
> #endif
> netdev->features = NETIF_F_SG |
> - NETIF_F_IP_CSUM |
> - NETIF_F_IPV6_CSUM |
> - NETIF_F_HW_VLAN_CTAG_TX |
> - NETIF_F_HW_VLAN_CTAG_RX |
> NETIF_F_TSO |
> NETIF_F_TSO6 |
> NETIF_F_RXHASH |
> - NETIF_F_RXCSUM;
> -
> - netdev->hw_features = netdev->features | NETIF_F_HW_L2FW_DOFFLOAD;
> + NETIF_F_RXCSUM |
> + NETIF_F_HW_CSUM |
> + NETIF_F_SCTP_CRC |
> + NETIF_F_HW_VLAN_CTAG_TX |
> + NETIF_F_HW_VLAN_CTAG_RX;
>
> - switch (adapter->hw.mac.type) {
> - case ixgbe_mac_82599EB:
> - case ixgbe_mac_X540:
> - case ixgbe_mac_X550:
> - case ixgbe_mac_X550EM_x:
> + if (hw->mac.type >= ixgbe_mac_82599EB)
> netdev->features |= NETIF_F_SCTP_CRC;
> - netdev->hw_features |= NETIF_F_SCTP_CRC |
> - NETIF_F_NTUPLE |
> - NETIF_F_HW_TC;
> - break;
> - default:
> - break;
> - }
>
> - netdev->hw_features |= NETIF_F_RXALL;
> + /* copy netdev features into list of user selectable features */
> + netdev->hw_features |= netdev->features;
> + netdev->hw_features |= NETIF_F_RXALL |
> + NETIF_F_HW_L2FW_DOFFLOAD;
> +
> + if (hw->mac.type >= ixgbe_mac_82599EB)
> + netdev->hw_features |= NETIF_F_NTUPLE;
looks like the cleanup missed moving NETIF_F_HW_TC flag here that
enables cls_u32 offloads via TC.
> +
> + /* set this bit last since it cannot be part of hw_features */
> netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
>
> - netdev->vlan_features |= NETIF_F_TSO;
> - netdev->vlan_features |= NETIF_F_TSO6;
> - netdev->vlan_features |= NETIF_F_IP_CSUM;
> - netdev->vlan_features |= NETIF_F_IPV6_CSUM;
> - netdev->vlan_features |= NETIF_F_SG;
> + netdev->vlan_features |= NETIF_F_SG |
> + NETIF_F_TSO |
> + NETIF_F_TSO6 |
> + NETIF_F_HW_CSUM |
> + NETIF_F_SCTP_CRC;
>
> - netdev->hw_enc_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
> + netdev->mpls_features |= NETIF_F_HW_CSUM;
> + netdev->hw_enc_features |= NETIF_F_HW_CSUM;
>
> netdev->priv_flags |= IFF_UNICAST_FLT;
> netdev->priv_flags |= IFF_SUPP_NOFCS;
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