[PATCH net-next v3 2/2] net: mana: Drop TX skb on post_work_request failure and unmap resources
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STALE333d
From: Aditya Garg <hidden>
Date: 2025-11-11 08:14:42
Also in:
linux-hyperv, linux-rdma, lkml
Subsystem:
hyper-v/azure core and drivers, networking drivers, networking [general], the rest · Maintainers:
"K. Y. Srinivasan", Haiyang Zhang, Wei Liu, Dexuan Cui, Long Li, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Revision v3 of 4 in this series.
Revisions (4)
- v3 current
- v4 [diff vs current]
- v5 [diff vs current]
- v6 [diff vs current]
Drop TX packets when posting the work request fails and ensure DMA mappings are always cleaned up. Signed-off-by: Aditya Garg <redacted> --- drivers/net/ethernet/microsoft/mana/gdma_main.c | 1 - drivers/net/ethernet/microsoft/mana/mana_en.c | 7 +++---- include/net/mana/mana.h | 1 + 3 files changed, 4 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index effe0a2f207a..65dd8060c7f4 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c@@ -1332,7 +1332,6 @@ int mana_gd_post_work_request(struct gdma_queue *wq, if (wq->monitor_avl_buf && wqe_size > mana_gd_wq_avail_space(wq)) { gc = wq->gdma_dev->gdma_context; - dev_err(gc->dev, "unsuccessful flow control!\n"); return -ENOSPC; }
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index 67ae5421f9ee..066d822f68f0 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c@@ -491,9 +491,9 @@ netdev_tx_t mana_start_xmit(struct sk_buff *skb, struct net_device *ndev) if (err) { (void)skb_dequeue_tail(&txq->pending_skbs); + mana_unmap_skb(skb, apc); netdev_warn(ndev, "Failed to post TX OOB: %d\n", err); - err = NETDEV_TX_BUSY; - goto tx_busy; + goto free_sgl_ptr; } err = NETDEV_TX_OK;
@@ -513,7 +513,6 @@ netdev_tx_t mana_start_xmit(struct sk_buff *skb, struct net_device *ndev) tx_stats->bytes += len + ((num_gso_seg - 1) * gso_hs); u64_stats_update_end(&tx_stats->syncp); -tx_busy: if (netif_tx_queue_stopped(net_txq) && mana_can_tx(gdma_sq)) { netif_tx_wake_queue(net_txq); apc->eth_stats.wake_queue++;
@@ -1679,7 +1678,7 @@ static int mana_move_wq_tail(struct gdma_queue *wq, u32 num_units) return 0; } -static void mana_unmap_skb(struct sk_buff *skb, struct mana_port_context *apc) +void mana_unmap_skb(struct sk_buff *skb, struct mana_port_context *apc) { struct mana_skb_head *ash = (struct mana_skb_head *)skb->head; struct gdma_context *gc = apc->ac->gdma_dev->gdma_context;
diff --git a/include/net/mana/mana.h b/include/net/mana/mana.h
index 50a532fb30d6..d05457d3e1ab 100644
--- a/include/net/mana/mana.h
+++ b/include/net/mana/mana.h@@ -585,6 +585,7 @@ int mana_set_bw_clamp(struct mana_port_context *apc, u32 speed, void mana_query_phy_stats(struct mana_port_context *apc); int mana_pre_alloc_rxbufs(struct mana_port_context *apc, int mtu, int num_queues); void mana_pre_dealloc_rxbufs(struct mana_port_context *apc); +void mana_unmap_skb(struct sk_buff *skb, struct mana_port_context *apc); extern const struct ethtool_ops mana_ethtool_ops; extern struct dentry *mana_debugfs_root;
--
2.43.0