Hi Simon,
On 11/14/25 16:06, Simon Horman wrote:
On Tue, Nov 11, 2025 at 03:45:18PM +0530, Meghana Malladi wrote:
...
diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
index 57a7d1ceab08..b66ffbfb499c 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth.c
@@ -735,6 +735,114 @@ static int icssg_update_vlan_mcast(struct net_device
*vdev, int vid,
return 0;
}
+static void prueth_destroy_txq(struct prueth_emac *emac)
+{
+ int ret, i;
+
+ atomic_set(&emac->tdown_cnt, emac->tx_ch_num);
+ /* ensure new tdown_cnt value is visible */
+ smp_mb__after_atomic();
+ /* tear down and disable UDMA channels */
+ reinit_completion(&emac->tdown_complete);
+ for (i = 0; i < emac->tx_ch_num; i++)
+ k3_udma_glue_tdown_tx_chn(emac->tx_chns[i].tx_chn, false);
+
+ ret = wait_for_completion_timeout(&emac->tdown_complete,
+ msecs_to_jiffies(1000));
+ if (!ret)
+ netdev_err(emac->ndev, "tx teardown timeout\n");
+
+ for (i = 0; i < emac->tx_ch_num; i++) {
+ napi_disable(&emac->tx_chns[i].napi_tx);
+ hrtimer_cancel(&emac->tx_chns[i].tx_hrtimer);
+ k3_udma_glue_reset_tx_chn(emac->tx_chns[i].tx_chn,
+ &emac->tx_chns[i],
+ prueth_tx_cleanup);
+ k3_udma_glue_disable_tx_chn(emac->tx_chns[i].tx_chn);
+ }
+}
+
+static void prueth_destroy_rxq(struct prueth_emac *emac)
+{
+ int i, ret;
+
+ /* tear down and disable UDMA channels */
+ reinit_completion(&emac->tdown_complete);
+ k3_udma_glue_tdown_rx_chn(emac->rx_chns.rx_chn, true);
+
+ /* When RX DMA Channel Teardown is initiated, it will result in an
+ * interrupt and a Teardown Completion Marker (TDCM) is queued into
+ * the RX Completion queue. Acknowledging the interrupt involves
+ * popping the TDCM descriptor from the RX Completion queue via the
+ * RX NAPI Handler. To avoid timing out when waiting for the TDCM to
+ * be popped, schedule the RX NAPI handler to run immediately.
+ */
+ if (!napi_if_scheduled_mark_missed(&emac->napi_rx)) {
+ if (napi_schedule_prep(&emac->napi_rx))
+ __napi_schedule(&emac->napi_rx);
+ }
+
+ ret = wait_for_completion_timeout(&emac->tdown_complete,
+ msecs_to_jiffies(1000));
+ if (!ret)
+ netdev_err(emac->ndev, "rx teardown timeout\n");
+
+ for (i = 0; i < PRUETH_MAX_RX_FLOWS; i++) {
+ napi_disable(&emac->napi_rx);
+ hrtimer_cancel(&emac->rx_hrtimer);
Hi Meghana,
Is it intentional that the napi_disable() and hrtimer_cancel()
are made once for each (possible) flow, rather than just once
as was the case before this patch?
Maybe the tx code, which does the same, was used as a template here
in error?
Currently there is only one flow per Rx channel. But we can enable
support to add multiple flows to a given given channel. In that case
napi_disable() and hrtimer_cancel() will be invoked per flow. That being
said, though right now this for loop is redundant this is a intentional
change for multiple flows.
Flagged by Claude Code with https://github.com/masoncl/review-prompts/
+ k3_udma_glue_reset_rx_chn(emac->rx_chns.rx_chn, i,
+ &emac->rx_chns,
+ prueth_rx_cleanup);
+ }
+
+ prueth_destroy_xdp_rxqs(emac);
+ k3_udma_glue_disable_rx_chn(emac->rx_chns.rx_chn);
+}
...
@@ -905,32 +988,8 @@ static int emac_ndo_stop(struct net_device *ndev)
else
__dev_mc_unsync(ndev, icssg_prueth_del_mcast);
- atomic_set(&emac->tdown_cnt, emac->tx_ch_num);
- /* ensure new tdown_cnt value is visible */
- smp_mb__after_atomic();
- /* tear down and disable UDMA channels */
- reinit_completion(&emac->tdown_complete);
- for (i = 0; i < emac->tx_ch_num; i++)
- k3_udma_glue_tdown_tx_chn(emac->tx_chns[i].tx_chn, false);
-
- ret = wait_for_completion_timeout(&emac->tdown_complete,
- msecs_to_jiffies(1000));
- if (!ret)
- netdev_err(ndev, "tx teardown timeout\n");
-
- prueth_reset_tx_chan(emac, emac->tx_ch_num, true);
- for (i = 0; i < emac->tx_ch_num; i++) {
- napi_disable(&emac->tx_chns[i].napi_tx);
- hrtimer_cancel(&emac->tx_chns[i].tx_hrtimer);
- }
-
- max_rx_flows = PRUETH_MAX_RX_FLOWS;
- k3_udma_glue_tdown_rx_chn(emac->rx_chns.rx_chn, true);
-
- prueth_reset_rx_chan(&emac->rx_chns, max_rx_flows, true);
- prueth_destroy_xdp_rxqs(emac);
- napi_disable(&emac->napi_rx);
- hrtimer_cancel(&emac->rx_hrtimer);
+ prueth_destroy_txq(emac);
+ prueth_destroy_rxq(emac);
cancel_work_sync(&emac->rx_mode_work);
@@ -943,10 +1002,10 @@ static int emac_ndo_stop(struct net_device *ndev)
free_irq(emac->tx_ts_irq, emac);
- free_irq(emac->rx_chns.irq[rx_flow], emac);
+ free_irq(emac->rx_chns.irq[PRUETH_RX_FLOW_DATA], emac);
prueth_ndev_del_tx_napi(emac, emac->tx_ch_num);
- prueth_cleanup_rx_chns(emac, &emac->rx_chns, max_rx_flows);
+ prueth_cleanup_rx_chns(emac, &emac->rx_chns, PRUETH_MAX_RX_FLOWS);
prueth_cleanup_tx_chns(emac);
prueth->emacs_initialized--;
...
