lkml.org 
[lkml]   [2017]   [Mar]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH V2 net-next 08/18] net: hns: Replace netif_tx_lock to ring spin lock
Date
From: lipeng <lipeng321@huawei.com>

netif_tx_lock is a global spin lock, it will take affect
in all rings in the netdevice. In tx_poll_one process, it can
only lock the current ring, in this case, we define a spin lock
in hnae_ring struct for it.

Signed-off-by: lipeng <lipeng321@huawei.com>
reviewed-by: Yisen Zhuang <yisen.zhuang@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
---
drivers/net/ethernet/hisilicon/hns/hnae.c | 1 +
drivers/net/ethernet/hisilicon/hns/hnae.h | 3 +++
drivers/net/ethernet/hisilicon/hns/hns_enet.c | 21 +++++++++++----------
3 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hnae.c b/drivers/net/ethernet/hisilicon/hns/hnae.c
index 78af663..513c257 100644
--- a/drivers/net/ethernet/hisilicon/hns/hnae.c
+++ b/drivers/net/ethernet/hisilicon/hns/hnae.c
@@ -196,6 +196,7 @@ hnae_init_ring(struct hnae_queue *q, struct hnae_ring *ring, int flags)

ring->q = q;
ring->flags = flags;
+ spin_lock_init(&ring->lock);
assert(!ring->desc && !ring->desc_cb && !ring->desc_dma_addr);

/* not matter for tx or rx ring, the ntc and ntc start from 0 */
diff --git a/drivers/net/ethernet/hisilicon/hns/hnae.h b/drivers/net/ethernet/hisilicon/hns/hnae.h
index c66581d..859c536 100644
--- a/drivers/net/ethernet/hisilicon/hns/hnae.h
+++ b/drivers/net/ethernet/hisilicon/hns/hnae.h
@@ -275,6 +275,9 @@ struct hnae_ring {
/* statistic */
struct ring_stats stats;

+ /* ring lock for poll one */
+ spinlock_t lock;
+
dma_addr_t desc_dma_addr;
u32 buf_size; /* size for hnae_desc->addr, preset by AE */
u16 desc_num; /* total number of desc */
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index 3449a18..3634366 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -922,12 +922,13 @@ static int is_valid_clean_head(struct hnae_ring *ring, int h)

/* netif_tx_lock will turn down the performance, set only when necessary */
#ifdef CONFIG_NET_POLL_CONTROLLER
-#define NETIF_TX_LOCK(ndev) netif_tx_lock(ndev)
-#define NETIF_TX_UNLOCK(ndev) netif_tx_unlock(ndev)
+#define NETIF_TX_LOCK(ring) spin_lock(&ring->lock)
+#define NETIF_TX_UNLOCK(ring) spin_unlock(&ring->lock)
#else
-#define NETIF_TX_LOCK(ndev)
-#define NETIF_TX_UNLOCK(ndev)
+#define NETIF_TX_LOCK(ring)
+#define NETIF_TX_UNLOCK(ring)
#endif
+
/* reclaim all desc in one budget
* return error or number of desc left
*/
@@ -941,13 +942,13 @@ static int hns_nic_tx_poll_one(struct hns_nic_ring_data *ring_data,
int head;
int bytes, pkts;

- NETIF_TX_LOCK(ndev);
+ NETIF_TX_LOCK(ring);

head = readl_relaxed(ring->io_base + RCB_REG_HEAD);
rmb(); /* make sure head is ready before touch any data */

if (is_ring_empty(ring) || head == ring->next_to_clean) {
- NETIF_TX_UNLOCK(ndev);
+ NETIF_TX_UNLOCK(ring);
return 0; /* no data to poll */
}

@@ -955,7 +956,7 @@ static int hns_nic_tx_poll_one(struct hns_nic_ring_data *ring_data,
netdev_err(ndev, "wrong head (%d, %d-%d)\n", head,
ring->next_to_use, ring->next_to_clean);
ring->stats.io_err_cnt++;
- NETIF_TX_UNLOCK(ndev);
+ NETIF_TX_UNLOCK(ring);
return -EIO;
}

@@ -967,7 +968,7 @@ static int hns_nic_tx_poll_one(struct hns_nic_ring_data *ring_data,
prefetch(&ring->desc_cb[ring->next_to_clean]);
}

- NETIF_TX_UNLOCK(ndev);
+ NETIF_TX_UNLOCK(ring);

dev_queue = netdev_get_tx_queue(ndev, ring_data->queue_index);
netdev_tx_completed_queue(dev_queue, pkts, bytes);
@@ -1028,7 +1029,7 @@ static void hns_nic_tx_clr_all_bufs(struct hns_nic_ring_data *ring_data)
int head;
int bytes, pkts;

- NETIF_TX_LOCK(ndev);
+ NETIF_TX_LOCK(ring);

head = ring->next_to_use; /* ntu :soft setted ring position*/
bytes = 0;
@@ -1036,7 +1037,7 @@ static void hns_nic_tx_clr_all_bufs(struct hns_nic_ring_data *ring_data)
while (head != ring->next_to_clean)
hns_nic_reclaim_one_desc(ring, &bytes, &pkts);

- NETIF_TX_UNLOCK(ndev);
+ NETIF_TX_UNLOCK(ring);

dev_queue = netdev_get_tx_queue(ndev, ring_data->queue_index);
netdev_tx_reset_queue(dev_queue);
--
2.7.4

\
 
 \ /
  Last update: 2017-03-31 13:22    [W:6.793 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site