5.15-stable review patch. If anyone has any objections, please let me know.
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From: Jie Wang wangjie125@huawei.com
[ Upstream commit 968fde83841a8c23558dfbd0a0c69d636db52b55 ]
Currently hns3 ring buffer init process would hold cpu too long with big Tx/Rx ring depth. This could cause soft lockup.
So this patch adds cond_resched() to the process. Then cpu can break to run other tasks instead of busy looping.
Fixes: a723fb8efe29 ("net: hns3: refine for set ring parameters") Signed-off-by: Jie Wang wangjie125@huawei.com Signed-off-by: Jijie Shao shaojijie@huawei.com Reviewed-by: Simon Horman horms@kernel.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 4 ++++ drivers/net/ethernet/hisilicon/hns3/hns3_enet.h | 2 ++ 2 files changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c index bbbafd8aa1b09..e48d33927c176 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c @@ -3342,6 +3342,9 @@ static int hns3_alloc_ring_buffers(struct hns3_enet_ring *ring) ret = hns3_alloc_and_attach_buffer(ring, i); if (ret) goto out_buffer_fail; + + if (!(i % HNS3_RESCHED_BD_NUM)) + cond_resched(); }
return 0; @@ -4887,6 +4890,7 @@ int hns3_init_all_ring(struct hns3_nic_priv *priv) }
u64_stats_init(&priv->ring[i].syncp); + cond_resched(); }
return 0; diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h index 91b656adaacb0..f60ba2ee8b8b1 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h @@ -206,6 +206,8 @@ enum hns3_nic_state { #define HNS3_CQ_MODE_EQE 1U #define HNS3_CQ_MODE_CQE 0U
+#define HNS3_RESCHED_BD_NUM 1024 + enum hns3_pkt_l2t_type { HNS3_L2_TYPE_UNICAST, HNS3_L2_TYPE_MULTICAST,