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Message-ID: <20230208213019.460d7163@kernel.org>
Date: Wed, 8 Feb 2023 21:30:19 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>
Cc: intel-wired-lan@...osl.org, vinicius.gomes@...el.com,
naamax.meir@...ux.intel.com, anthony.l.nguyen@...el.com,
leon@...nel.org, davem@...emloft.net, pabeni@...hat.com,
edumazet@...gle.com, tee.min.tan@...ux.intel.com,
netdev@...r.kernel.org, sasha.neftin@...el.com
Subject: Re: [PATCH net-next v3] igc: offload queue max SDU from tc-taprio
On Wed, 8 Feb 2023 08:33:27 +0800 Muhammad Husaini Zulkifli wrote:
> From: Tan Tee Min <tee.min.tan@...ux.intel.com>
>
> Add support for configuring the max SDU for each Tx queue.
> If not specified, keep the default.
> diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
> index 0cc327294dfb5..38ad437957ada 100644
> --- a/drivers/net/ethernet/intel/igc/igc_main.c
> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
> @@ -1508,6 +1508,7 @@ static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
> __le32 launch_time = 0;
> u32 tx_flags = 0;
> unsigned short f;
> + u32 max_sdu = 0;
This variable can be moved to the scope of the if() ?
> ktime_t txtime;
> u8 hdr_len = 0;
> int tso = 0;
> @@ -1527,6 +1528,14 @@ static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
> return NETDEV_TX_BUSY;
> }
>
> + if (tx_ring->max_sdu > 0) {
> + max_sdu = tx_ring->max_sdu +
> + (skb_vlan_tagged(skb) ? VLAN_HLEN : 0);
> +
> + if (skb->len > max_sdu)
You should increment some counter here. Otherwise it's a silent discard.
> + goto skb_drop;
> + }
> +
> if (!tx_ring->launchtime_enable)
> goto done;
>
> @@ -1606,6 +1615,11 @@ static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
> dev_kfree_skb_any(first->skb);
first->skb is skb, as far as I can tell, you can reshuffle this code to
avoid adding the new return flow.
> first->skb = NULL;
>
> + return NETDEV_TX_OK;
> +
> +skb_drop:
> + dev_kfree_skb_any(skb);
> +
> return NETDEV_TX_OK;
> }
> @@ -6122,6 +6137,16 @@ static int igc_save_qbv_schedule(struct igc_adapter *adapter,
> }
> }
>
> + for (i = 0; i < adapter->num_tx_queues; i++) {
> + struct igc_ring *ring = adapter->tx_ring[i];
> + struct net_device *dev = adapter->netdev;
> +
> + if (qopt->max_sdu[i])
> + ring->max_sdu = qopt->max_sdu[i] + dev->hard_header_len;
why hard_header_len? Isn't it always ETH_HLEN?
> + else
> + ring->max_sdu = 0;
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