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OpenCloudOS-Kernel
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net: hns: fix port unavailable after hnae_reserve_buffer_map fail 

When hnae_reserve_buffer_map fail, it will break cycle and some
buffer description has no available memory, therefore the port will
be unavailable.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Reviewed-by: Yisen Zhuang <yisen.zhuang@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
lipeng 2016-09-29 18:09:09 +01:00 committed by Doug Ledford
parent 528f1deb16
commit 0e97cd4e46
1 changed files with 18 additions and 5 deletions
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23
drivers/net/ethernet/hisilicon/hns/hns_enet.c
View File

@ -747,6 +747,14 @@ static void hns_nic_rx_up_pro(struct hns_nic_ring_data *ring_data,
ndev->last_rx = jiffies;
}
static int hns_desc_unused(struct hnae_ring *ring)
{
int ntc = ring->next_to_clean;
int ntu = ring->next_to_use;
return ((ntc >= ntu) ? 0 : ring->desc_num) + ntc - ntu;
}
static int hns_nic_rx_poll_one(struct hns_nic_ring_data *ring_data,
int budget, void *v)
{
@ -755,17 +763,21 @@ static int hns_nic_rx_poll_one(struct hns_nic_ring_data *ring_data,
int num, bnum, ex_num;
#define RCB_NOF_ALLOC_RX_BUFF_ONCE 16
int recv_pkts, recv_bds, clean_count, err;
int unused_count = hns_desc_unused(ring);
num = readl_relaxed(ring->io_base + RCB_REG_FBDNUM);
rmb(); /* make sure num taken effect before the other data is touched */
recv_pkts = 0, recv_bds = 0, clean_count = 0;
num -= unused_count;
recv:
while (recv_pkts < budget && recv_bds < num) {
/* reuse or realloc buffers */
if (clean_count >= RCB_NOF_ALLOC_RX_BUFF_ONCE) {
hns_nic_alloc_rx_buffers(ring_data, clean_count);
if (clean_count + unused_count >= RCB_NOF_ALLOC_RX_BUFF_ONCE) {
hns_nic_alloc_rx_buffers(ring_data,
clean_count + unused_count);
clean_count = 0;
unused_count = hns_desc_unused(ring);
}
/* poll one pkt */
@ -789,7 +801,7 @@ recv:
/* make all data has been write before submit */
if (recv_pkts < budget) {
ex_num = readl_relaxed(ring->io_base + RCB_REG_FBDNUM);
ex_num -= unused_count;
if (ex_num > clean_count) {
num += ex_num - clean_count;
rmb(); /*complete read rx ring bd number*/
@ -799,8 +811,9 @@ recv:
out:
/* make all data has been write before submit */
if (clean_count > 0)
hns_nic_alloc_rx_buffers(ring_data, clean_count);
if (clean_count + unused_count > 0)
hns_nic_alloc_rx_buffers(ring_data,
clean_count + unused_count);
return recv_pkts;
}