net: xilinx: axienet: Implement BQL

Implement byte queue limits to allow queueing disciplines to account for
packets enqueued in the ring buffers but not yet transmitted.

Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Link: https://patch.msgid.link/20250214211252.2615573-1-sean.anderson@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index 2ffaad0b0477f58bf2f3b4a88362fbf72c6a05c5..60a5bceb01174a7d90a65df0bba5cb8848184805 100644 (file)
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -1002,6 +1002,7 @@ static int axienet_tx_poll(struct napi_struct *napi, int budget)
                                        &size, budget);
 
        if (packets) {
+               netdev_completed_queue(ndev, packets, size);
                u64_stats_update_begin(&lp->tx_stat_sync);
                u64_stats_add(&lp->tx_packets, packets);
                u64_stats_add(&lp->tx_bytes, size);
@@ -1125,6 +1126,7 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
        if (++new_tail_ptr >= lp->tx_bd_num)
                new_tail_ptr = 0;
        WRITE_ONCE(lp->tx_bd_tail, new_tail_ptr);
+       netdev_sent_queue(ndev, skb->len);
 
        /* Start the transfer */
        axienet_dma_out_addr(lp, XAXIDMA_TX_TDESC_OFFSET, tail_p);
@@ -1751,6 +1753,7 @@ static int axienet_stop(struct net_device *ndev)
                dma_release_channel(lp->tx_chan);
        }
 
+       netdev_reset_queue(ndev);
        axienet_iow(lp, XAE_IE_OFFSET, 0);
 
        if (lp->eth_irq > 0)
@@ -2676,6 +2679,7 @@ static void axienet_dma_err_handler(struct work_struct *work)
                           ~(XAE_OPTION_TXEN | XAE_OPTION_RXEN));
 
        axienet_dma_stop(lp);
+       netdev_reset_queue(ndev);
 
        for (i = 0; i < lp->tx_bd_num; i++) {
                cur_p = &lp->tx_bd_v[i];