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Message-ID: <20251110103541.GA30450@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date: Mon, 10 Nov 2025 02:35:41 -0800
From: Dipayaan Roy <dipayanroy@...ux.microsoft.com>
To: kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
decui@...rosoft.com, andrew+netdev@...n.ch, davem@...emloft.net,
edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
longli@...rosoft.com, kotaranov@...rosoft.com, horms@...nel.org,
shradhagupta@...ux.microsoft.com, ssengar@...ux.microsoft.com,
ernis@...ux.microsoft.com, shirazsaleem@...rosoft.com,
linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
dipayanroy@...rosoft.com
Subject: [PATCH net-next, v3] net: mana: Implement ndo_tx_timeout and
serialize queue resets per port.
Implement .ndo_tx_timeout for MANA so any stalled TX queue can be detected
and a device-controlled port reset for all queues can be scheduled to a
ordered workqueue. The reset for all queues on stall detection is
recomended by hardware team.
The change introduces a single ordered workqueue
("mana_per_port_queue_reset_wq") with WQ_UNBOUND | WQ_MEM_RECLAIM and
queues exactly one work_struct per port onto it.
Reviewed-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
Signed-off-by: Dipayaan Roy <dipayanroy@...ux.microsoft.com>
---
Changes in v3:
-Fixed commit meesage, removed rtnl_trylock and added
disable_work_sync, fixed mana_queue_reset_work, and few
cosmetics.
Changes in v2:
-Fixed cosmetic changes.
---
---
drivers/net/ethernet/microsoft/mana/mana_en.c | 78 ++++++++++++++++++-
include/net/mana/gdma.h | 7 +-
include/net/mana/mana.h | 7 ++
3 files changed, 90 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index cccd5b63cee6..636df3b066c5 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -298,6 +298,42 @@ static int mana_get_gso_hs(struct sk_buff *skb)
return gso_hs;
}
+static void mana_per_port_queue_reset_work_handler(struct work_struct *work)
+{
+ struct mana_queue_reset_work *reset_queue_work =
+ container_of(work, struct mana_queue_reset_work, work);
+
+ struct mana_port_context *apc = container_of(reset_queue_work,
+ struct mana_port_context,
+ queue_reset_work);
+ struct net_device *ndev = apc->ndev;
+ int err;
+
+ rtnl_lock();
+
+ /* Pre-allocate buffers to prevent failure in mana_attach later */
+ err = mana_pre_alloc_rxbufs(apc, ndev->mtu, apc->num_queues);
+ if (err) {
+ netdev_err(ndev, "Insufficient memory for reset post tx stall detection\n");
+ goto out;
+ }
+
+ err = mana_detach(ndev, false);
+ if (err) {
+ netdev_err(ndev, "mana_detach failed: %d\n", err);
+ goto dealloc_pre_rxbufs;
+ }
+
+ err = mana_attach(ndev);
+ if (err)
+ netdev_err(ndev, "mana_attach failed: %d\n", err);
+
+dealloc_pre_rxbufs:
+ mana_pre_dealloc_rxbufs(apc);
+out:
+ rtnl_unlock();
+}
+
netdev_tx_t mana_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
enum mana_tx_pkt_format pkt_fmt = MANA_SHORT_PKT_FMT;
@@ -802,6 +838,23 @@ static int mana_change_mtu(struct net_device *ndev, int new_mtu)
return err;
}
+static void mana_tx_timeout(struct net_device *netdev, unsigned int txqueue)
+{
+ struct mana_port_context *apc = netdev_priv(netdev);
+ struct mana_context *ac = apc->ac;
+ struct gdma_context *gc = ac->gdma_dev->gdma_context;
+
+ /* Already in service, hence tx queue reset is not required.*/
+ if (gc->in_service)
+ return;
+
+ /* Note: If there are pending queue reset work for this port(apc),
+ * subsequent request queued up from here are ignored. This is because
+ * we are using the same work instance per port(apc).
+ */
+ queue_work(ac->per_port_queue_reset_wq, &apc->queue_reset_work.work);
+}
+
static int mana_shaper_set(struct net_shaper_binding *binding,
const struct net_shaper *shaper,
struct netlink_ext_ack *extack)
@@ -884,7 +937,9 @@ static const struct net_device_ops mana_devops = {
.ndo_bpf = mana_bpf,
.ndo_xdp_xmit = mana_xdp_xmit,
.ndo_change_mtu = mana_change_mtu,
- .net_shaper_ops = &mana_shaper_ops,
+ .ndo_tx_timeout = mana_tx_timeout,
+ .net_shaper_ops = &mana_shaper_ops,
+
};
static void mana_cleanup_port_context(struct mana_port_context *apc)
@@ -3244,6 +3299,7 @@ static int mana_probe_port(struct mana_context *ac, int port_idx,
ndev->min_mtu = ETH_MIN_MTU;
ndev->needed_headroom = MANA_HEADROOM;
ndev->dev_port = port_idx;
+ ndev->watchdog_timeo = 15 * HZ;
SET_NETDEV_DEV(ndev, gc->dev);
netif_set_tso_max_size(ndev, GSO_MAX_SIZE);
@@ -3283,6 +3339,10 @@ static int mana_probe_port(struct mana_context *ac, int port_idx,
debugfs_create_u32("current_speed", 0400, apc->mana_port_debugfs, &apc->speed);
+ /* Initialize the per port queue reset work.*/
+ INIT_WORK(&apc->queue_reset_work.work,
+ mana_per_port_queue_reset_work_handler);
+
return 0;
free_indir:
@@ -3488,6 +3548,15 @@ int mana_probe(struct gdma_dev *gd, bool resuming)
if (ac->num_ports > MAX_PORTS_IN_MANA_DEV)
ac->num_ports = MAX_PORTS_IN_MANA_DEV;
+ ac->per_port_queue_reset_wq =
+ alloc_ordered_workqueue("mana_per_port_queue_reset_wq",
+ WQ_UNBOUND | WQ_MEM_RECLAIM);
+ if (!ac->per_port_queue_reset_wq) {
+ dev_err(dev, "Failed to allocate per port queue reset workqueue\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
if (!resuming) {
for (i = 0; i < ac->num_ports; i++) {
err = mana_probe_port(ac, i, &ac->ports[i]);
@@ -3557,6 +3626,8 @@ void mana_remove(struct gdma_dev *gd, bool suspending)
goto out;
}
+ disable_work_sync(&apc->queue_reset_work.work);
+
/* All cleanup actions should stay after rtnl_lock(), otherwise
* other functions may access partially cleaned up data.
*/
@@ -3581,6 +3652,11 @@ void mana_remove(struct gdma_dev *gd, bool suspending)
free_netdev(ndev);
}
+ if (ac->per_port_queue_reset_wq) {
+ destroy_workqueue(ac->per_port_queue_reset_wq);
+ ac->per_port_queue_reset_wq = NULL;
+ }
+
mana_destroy_eq(ac);
out:
mana_gd_deregister_device(gd);
diff --git a/include/net/mana/gdma.h b/include/net/mana/gdma.h
index 637f42485dba..b892296705de 100644
--- a/include/net/mana/gdma.h
+++ b/include/net/mana/gdma.h
@@ -590,6 +590,10 @@ enum {
/* Driver can self reset on FPGA Reconfig EQE notification */
#define GDMA_DRV_CAP_FLAG_1_HANDLE_RECONFIG_EQE BIT(17)
+
+/* Driver detects stalled send queues and recovers them */
+#define GDMA_DRV_CAP_FLAG_1_HANDLE_STALL_SQ_RECOVERY BIT(18)
+
#define GDMA_DRV_CAP_FLAG_1_HW_VPORT_LINK_AWARE BIT(6)
#define GDMA_DRV_CAP_FLAGS1 \
@@ -601,7 +605,8 @@ enum {
GDMA_DRV_CAP_FLAG_1_DYNAMIC_IRQ_ALLOC_SUPPORT | \
GDMA_DRV_CAP_FLAG_1_SELF_RESET_ON_EQE | \
GDMA_DRV_CAP_FLAG_1_HANDLE_RECONFIG_EQE | \
- GDMA_DRV_CAP_FLAG_1_HW_VPORT_LINK_AWARE)
+ GDMA_DRV_CAP_FLAG_1_HW_VPORT_LINK_AWARE |\
+ GDMA_DRV_CAP_FLAG_1_HANDLE_STALL_SQ_RECOVERY)
#define GDMA_DRV_CAP_FLAGS2 0
diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
index 8906901535f5..095f5f1cb2ad 100644
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h
@@ -475,6 +475,7 @@ struct mana_context {
struct mana_eq *eqs;
struct dentry *mana_eqs_debugfs;
+ struct workqueue_struct *per_port_queue_reset_wq;
struct net_device *ports[MAX_PORTS_IN_MANA_DEV];
@@ -483,9 +484,15 @@ struct mana_context {
u32 link_event;
};
+struct mana_queue_reset_work {
+ /* Work structure */
+ struct work_struct work;
+};
+
struct mana_port_context {
struct mana_context *ac;
struct net_device *ndev;
+ struct mana_queue_reset_work queue_reset_work;
u8 mac_addr[ETH_ALEN];
--
2.43.0
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