From: lipeng Date: Thu, 29 Sep 2016 17:09:09 +0000 (+0100) Subject: net: hns: fix port unavailable after hnae_reserve_buffer_map fail X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0e97cd4e4632e385b3bf7edcf0c803de0487212a;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Reviewed-by: Yisen Zhuang Signed-off-by: Salil Mehta Signed-off-by: Doug Ledford --- diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c index d7e1f8c7ae92..32ff27028687 100644 --- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c +++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c @@ -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; }