From: Huazhong Tan <tanhuazhong@huawei.com>
To: <davem@davemloft.net>
Cc: <netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<salil.mehta@huawei.com>, <yisen.zhuang@huawei.com>,
<linuxarm@huawei.com>, <jakub.kicinski@netronome.com>,
Yunsheng Lin <linyunsheng@huawei.com>,
Huazhong Tan <tanhuazhong@huawei.com>
Subject: [PATCH net 1/3] net: hns3: fix for TX queue not restarted problem
Date: Tue, 3 Dec 2019 11:08:53 +0800 [thread overview]
Message-ID: <1575342535-2981-2-git-send-email-tanhuazhong@huawei.com> (raw)
In-Reply-To: <1575342535-2981-1-git-send-email-tanhuazhong@huawei.com>
From: Yunsheng Lin <linyunsheng@huawei.com>
There is timing window between ring_space checking and
netif_stop_subqueue when transmiting a SKB, and the TX BD
cleaning may be executed during the time window, which may
caused TX queue not restarted problem.
This patch fixes it by rechecking the ring_space after
netif_stop_subqueue to make sure TX queue is restarted.
Also, the ring->next_to_clean is updated even when pkts is
zero, because all the TX BD cleaned may be non-SKB, so it
needs to check if TX queue need to be restarted.
Fixes: 76ad4f0ee747 ("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC")
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
---
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 36 ++++++++++++++++---------
1 file changed, 23 insertions(+), 13 deletions(-)
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index ba05368..b2bb8e2 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1286,13 +1286,16 @@ static bool hns3_skb_need_linearized(struct sk_buff *skb, unsigned int *bd_size,
return false;
}
-static int hns3_nic_maybe_stop_tx(struct hns3_enet_ring *ring,
+static int hns3_nic_maybe_stop_tx(struct net_device *netdev,
struct sk_buff **out_skb)
{
+ struct hns3_nic_priv *priv = netdev_priv(netdev);
unsigned int bd_size[HNS3_MAX_TSO_BD_NUM + 1U];
struct sk_buff *skb = *out_skb;
+ struct hns3_enet_ring *ring;
unsigned int bd_num;
+ ring = &priv->ring[skb->queue_mapping];
bd_num = hns3_tx_bd_num(skb, bd_size);
if (unlikely(bd_num > HNS3_MAX_NON_TSO_BD_NUM)) {
struct sk_buff *new_skb;
@@ -1320,10 +1323,23 @@ static int hns3_nic_maybe_stop_tx(struct hns3_enet_ring *ring,
}
out:
- if (unlikely(ring_space(ring) < bd_num))
- return -EBUSY;
+ if (likely(ring_space(ring) >= bd_num))
+ return bd_num;
- return bd_num;
+ netif_stop_subqueue(netdev, ring->queue_index);
+ smp_mb(); /* Memory barrier before checking ring_space */
+
+ /* Start queue in case hns3_clean_tx_ring has just made room
+ * available and has not seen the queue stopped state performed
+ * by netif_stop_subqueue above.
+ */
+ if (ring_space(ring) >= bd_num && netif_carrier_ok(netdev) &&
+ !test_bit(HNS3_NIC_STATE_DOWN, &priv->state)) {
+ netif_start_subqueue(netdev, ring->queue_index);
+ return bd_num;
+ }
+
+ return -EBUSY;
}
static void hns3_clear_desc(struct hns3_enet_ring *ring, int next_to_use_orig)
@@ -1400,13 +1416,13 @@ netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
/* Prefetch the data used later */
prefetch(skb->data);
- ret = hns3_nic_maybe_stop_tx(ring, &skb);
+ ret = hns3_nic_maybe_stop_tx(netdev, &skb);
if (unlikely(ret <= 0)) {
if (ret == -EBUSY) {
u64_stats_update_begin(&ring->syncp);
ring->stats.tx_busy++;
u64_stats_update_end(&ring->syncp);
- goto out_net_tx_busy;
+ return NETDEV_TX_BUSY;
} else if (ret == -ENOMEM) {
u64_stats_update_begin(&ring->syncp);
ring->stats.sw_err_cnt++;
@@ -1457,12 +1473,6 @@ netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
out_err_tx_ok:
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
-
-out_net_tx_busy:
- netif_stop_subqueue(netdev, ring->queue_index);
- smp_mb(); /* Commit all data before submit */
-
- return NETDEV_TX_BUSY;
}
static int hns3_nic_net_set_mac_address(struct net_device *netdev, void *p)
@@ -2519,7 +2529,7 @@ void hns3_clean_tx_ring(struct hns3_enet_ring *ring)
dev_queue = netdev_get_tx_queue(netdev, ring->tqp->tqp_index);
netdev_tx_completed_queue(dev_queue, pkts, bytes);
- if (unlikely(pkts && netif_carrier_ok(netdev) &&
+ if (unlikely(netif_carrier_ok(netdev) &&
ring_space(ring) > HNS3_MAX_TSO_BD_NUM)) {
/* Make sure that anybody stopping the queue after this
* sees the new next_to_clean.
--
2.7.4
next prev parent reply other threads:[~2019-12-03 3:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-03 3:08 [PATCH net 0/3] net: hns3: fixes for -net Huazhong Tan
2019-12-03 3:08 ` Huazhong Tan [this message]
2019-12-03 3:25 ` [PATCH net 1/3] net: hns3: fix for TX queue not restarted problem David Miller
2019-12-03 4:28 ` Yunsheng Lin
2019-12-03 8:48 ` David Miller
2019-12-04 1:32 ` Yunsheng Lin
2019-12-03 3:08 ` [PATCH net 2/3] net: hns3: fix a use after free problem in hns3_nic_maybe_stop_tx() Huazhong Tan
2019-12-03 3:28 ` David Miller
2019-12-03 4:22 ` Yunsheng Lin
2019-12-03 19:57 ` David Miller
2019-12-04 1:33 ` Yunsheng Lin
2019-12-03 3:08 ` [PATCH net 3/3] net: hns3: fix VF ID issue for setting VF VLAN Huazhong Tan
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