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net: hns3: optimize the barrier using when cleaning TX BD 

Currently, a barrier is used when cleaning each TX BD, which may
cause performance degradation.

This patch optimizes it to use one barrier when cleaning TX BD
each round.

Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yunsheng Lin 2019-05-06 10:48:49 +08:00 committed by David S. Miller
parent aa9d22dd45
commit ce74370c2c
1 changed files with 15 additions and 14 deletions
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29
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
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@ -2186,20 +2186,25 @@ static void hns3_reuse_buffer(struct hns3_enet_ring *ring, int i)
ring->desc[i].rx.bd_base_info = 0;
}
static void hns3_nic_reclaim_one_desc(struct hns3_enet_ring *ring, int *bytes,
int *pkts)
static void hns3_nic_reclaim_desc(struct hns3_enet_ring *ring, int head,
int *bytes, int *pkts)
{
int ntc = ring->next_to_clean;
struct hns3_desc_cb *desc_cb;
desc_cb = &ring->desc_cb[ntc];
(*pkts) += (desc_cb->type == DESC_TYPE_SKB);
(*bytes) += desc_cb->length;
/* desc_cb will be cleaned, after hnae3_free_buffer_detach*/
hns3_free_buffer_detach(ring, ntc);
while (head != ntc) {
desc_cb = &ring->desc_cb[ntc];
(*pkts) += (desc_cb->type == DESC_TYPE_SKB);
(*bytes) += desc_cb->length;
/* desc_cb will be cleaned, after hnae3_free_buffer_detach */
hns3_free_buffer_detach(ring, ntc);
if (++ntc == ring->desc_num)
ntc = 0;
if (++ntc == ring->desc_num)
ntc = 0;
/* Issue prefetch for next Tx descriptor */
prefetch(&ring->desc_cb[ntc]);
}
/* This smp_store_release() pairs with smp_load_acquire() in
* ring_space called by hns3_nic_net_xmit.
@ -2244,11 +2249,7 @@ void hns3_clean_tx_ring(struct hns3_enet_ring *ring)
bytes = 0;
pkts = 0;
while (head != ring->next_to_clean) {
hns3_nic_reclaim_one_desc(ring, &bytes, &pkts);
/* Issue prefetch for next Tx descriptor */
prefetch(&ring->desc_cb[ring->next_to_clean]);
}
hns3_nic_reclaim_desc(ring, head, &bytes, &pkts);
ring->tqp_vector->tx_group.total_bytes += bytes;
ring->tqp_vector->tx_group.total_packets += pkts;