On Tue, Feb 04, 2025 at 08:49:06AM +0800, Song Yoong Siang wrote:
> Refactor the code for inserting an empty packet into a new function
> igc_insert_empty_packet(). This change extracts the logic for inserting
> an empty packet from igc_xmit_frame_ring() into a separate function,
> allowing it to be reused in future implementations, such as the XDP
> zero copy transmit function.
>
> This patch introduces no functional changes.
>
> Signed-off-by: Song Yoong Siang <yoong.siang.song@xxxxxxxxx>
> ---
> drivers/net/ethernet/intel/igc/igc_main.c | 42 ++++++++++++-----------
> 1 file changed, 22 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
> index 56a35d58e7a6..c3edd8bcf633 100644
> --- a/drivers/net/ethernet/intel/igc/igc_main.c
> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
> @@ -1566,6 +1566,26 @@ static bool igc_request_tx_tstamp(struct igc_adapter *adapter, struct sk_buff *s
> return false;
> }
>
> +static void igc_insert_empty_packet(struct igc_ring *tx_ring)
> +{
> + struct igc_tx_buffer *empty_info;
> + struct sk_buff *empty;
> + void *data;
> +
> + empty_info = &tx_ring->tx_buffer_info[tx_ring->next_to_use];
> + empty = alloc_skb(IGC_EMPTY_FRAME_SIZE, GFP_ATOMIC);
> + if (!empty)
> + return;
> +
> + data = skb_put(empty, IGC_EMPTY_FRAME_SIZE);
> + memset(data, 0, IGC_EMPTY_FRAME_SIZE);
> +
> + igc_tx_ctxtdesc(tx_ring, 0, false, 0, 0, 0);
> +
> + if (igc_init_tx_empty_descriptor(tx_ring, empty, empty_info) < 0)
> + dev_kfree_skb_any(empty);
> +}
> +
> static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
> struct igc_ring *tx_ring)
> {
> @@ -1603,26 +1623,8 @@ static netdev_tx_t igc_xmit_frame_ring(struct sk_buff *skb,
> skb->tstamp = ktime_set(0, 0);
> launch_time = igc_tx_launchtime(tx_ring, txtime, &first_flag, &insert_empty);
>
> - if (insert_empty) {
> - struct igc_tx_buffer *empty_info;
> - struct sk_buff *empty;
> - void *data;
> -
> - empty_info = &tx_ring->tx_buffer_info[tx_ring->next_to_use];
> - empty = alloc_skb(IGC_EMPTY_FRAME_SIZE, GFP_ATOMIC);
> - if (!empty)
> - goto done;
shouldn't this be 'goto drop' from day 1? pretty weird to silently ignore
allocation error.
> -
> - data = skb_put(empty, IGC_EMPTY_FRAME_SIZE);
> - memset(data, 0, IGC_EMPTY_FRAME_SIZE);
> -
> - igc_tx_ctxtdesc(tx_ring, 0, false, 0, 0, 0);
> -
> - if (igc_init_tx_empty_descriptor(tx_ring,
> - empty,
> - empty_info) < 0)
> - dev_kfree_skb_any(empty);
ditto
> - }
> + if (insert_empty)
> + igc_insert_empty_packet(tx_ring);
>
> done:
> /* record the location of the first descriptor for this packet */
> --
> 2.34.1
>
