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Date: Fri, 15 May 2020 10:21:48 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Luo bin <luobin9@...wei.com>
Cc: <davem@...emloft.net>, <linux-kernel@...r.kernel.org>,
<netdev@...r.kernel.org>, <luoxianjun@...wei.com>,
<yin.yinshi@...wei.com>, <cloud.wangxiaoyun@...wei.com>
Subject: Re: [PATCH net-next] hinic: add set_channels ethtool_ops support
On Fri, 15 May 2020 00:35:47 +0000 Luo bin wrote:
> add support to change TX/RX queue number with ethtool -L
>
> Signed-off-by: Luo bin <luobin9@...wei.com>
> ---
> .../net/ethernet/huawei/hinic/hinic_ethtool.c | 67 +++++++++++++++++--
> .../net/ethernet/huawei/hinic/hinic_hw_dev.c | 7 ++
> .../net/ethernet/huawei/hinic/hinic_hw_dev.h | 2 +
> .../net/ethernet/huawei/hinic/hinic_main.c | 5 +-
> drivers/net/ethernet/huawei/hinic/hinic_tx.c | 5 ++
> 5 files changed, 79 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/ethernet/huawei/hinic/hinic_ethtool.c b/drivers/net/ethernet/huawei/hinic/hinic_ethtool.c
> index ace18d258049..92a0e3bd19c3 100644
> --- a/drivers/net/ethernet/huawei/hinic/hinic_ethtool.c
> +++ b/drivers/net/ethernet/huawei/hinic/hinic_ethtool.c
> @@ -619,14 +619,68 @@ static void hinic_get_channels(struct net_device *netdev,
> struct hinic_dev *nic_dev = netdev_priv(netdev);
> struct hinic_hwdev *hwdev = nic_dev->hwdev;
>
> - channels->max_rx = hwdev->nic_cap.max_qps;
> - channels->max_tx = hwdev->nic_cap.max_qps;
> + channels->max_rx = 0;
> + channels->max_tx = 0;
No need to set members to zero, core passes in a zero-initialized
structure.
> channels->max_other = 0;
> - channels->max_combined = 0;
> - channels->rx_count = hinic_hwdev_num_qps(hwdev);
> - channels->tx_count = hinic_hwdev_num_qps(hwdev);
> + channels->max_combined = nic_dev->max_qps;
> + channels->rx_count = 0;
> + channels->tx_count = 0;
> channels->other_count = 0;
> - channels->combined_count = 0;
> + channels->combined_count = hinic_hwdev_num_qps(hwdev);
> +}
> +
> +int hinic_set_channels(struct net_device *netdev,
> + struct ethtool_channels *channels)
I haven't actually built this, but - static?
> +{
> + struct hinic_dev *nic_dev = netdev_priv(netdev);
> + unsigned int count = channels->combined_count;
> + int err;
> +
> + if (!count) {
> + netif_err(nic_dev, drv, netdev,
> + "Unsupported combined_count: 0\n");
> + return -EINVAL;
> + }
> +
> + if (channels->tx_count || channels->rx_count || channels->other_count) {
> + netif_err(nic_dev, drv, netdev,
> + "Setting rx/tx/other count not supported\n");
> + return -EINVAL;
> + }
Core already checks this:
if (channels.rx_count > curr.max_rx ||
channels.tx_count > curr.max_tx ||
channels.combined_count > curr.max_combined ||
channels.other_count > curr.max_other)
return -EINVAL;
> + if (!(nic_dev->flags & HINIC_RSS_ENABLE)) {
> + netif_err(nic_dev, drv, netdev,
> + "This function doesn't support RSS, only support 1 queue pair\n");
> + return -EOPNOTSUPP;
> + }
> +
> + if (count > nic_dev->max_qps) {
same here
> + netif_err(nic_dev, drv, netdev,
> + "Combined count %d exceeds limit %d\n",
> + count, nic_dev->max_qps);
> + return -EINVAL;
> + }
> +
> + netif_info(nic_dev, drv, netdev, "Set max combined queue number from %d to %d\n",
> + hinic_hwdev_num_qps(nic_dev->hwdev), count);
> +
> + if (netif_running(netdev)) {
> + netif_info(nic_dev, drv, netdev, "Restarting netdev\n");
> + hinic_close(netdev);
> +
> + hinic_update_num_qps(nic_dev->hwdev, count);
> +
> + err = hinic_open(netdev);
> + if (err) {
> + netif_err(nic_dev, drv, netdev,
> + "Failed to open netdev\n");
> + return -EFAULT;
> + }
> + } else {
> + hinic_update_num_qps(nic_dev->hwdev, count);
> + }
> +
> + return 0;
> }
>
> static int hinic_get_rss_hash_opts(struct hinic_dev *nic_dev,
> @@ -1219,6 +1273,7 @@ static const struct ethtool_ops hinic_ethtool_ops = {
> .get_ringparam = hinic_get_ringparam,
> .set_ringparam = hinic_set_ringparam,
> .get_channels = hinic_get_channels,
> + .set_channels = hinic_set_channels,
> .get_rxnfc = hinic_get_rxnfc,
> .set_rxnfc = hinic_set_rxnfc,
> .get_rxfh_key_size = hinic_get_rxfh_key_size,
> diff --git a/drivers/net/ethernet/huawei/hinic/hinic_hw_dev.c b/drivers/net/ethernet/huawei/hinic/hinic_hw_dev.c
> index 0245da02efbb..d40a0a5d2c8d 100644
> --- a/drivers/net/ethernet/huawei/hinic/hinic_hw_dev.c
> +++ b/drivers/net/ethernet/huawei/hinic/hinic_hw_dev.c
> @@ -858,6 +858,13 @@ int hinic_hwdev_num_qps(struct hinic_hwdev *hwdev)
> return nic_cap->num_qps;
> }
>
> +void hinic_update_num_qps(struct hinic_hwdev *hwdev, u16 num_qp)
> +{
> + struct hinic_cap *nic_cap = &hwdev->nic_cap;
> +
> + nic_cap->num_qps = num_qp;
> +}
> +
> /**
> * hinic_hwdev_get_sq - get SQ
> * @hwdev: the NIC HW device
> diff --git a/drivers/net/ethernet/huawei/hinic/hinic_hw_dev.h b/drivers/net/ethernet/huawei/hinic/hinic_hw_dev.h
> index 71ea7e46dbbc..e7dfe5ae2f8b 100644
> --- a/drivers/net/ethernet/huawei/hinic/hinic_hw_dev.h
> +++ b/drivers/net/ethernet/huawei/hinic/hinic_hw_dev.h
> @@ -359,6 +359,8 @@ int hinic_hwdev_max_num_qps(struct hinic_hwdev *hwdev);
>
> int hinic_hwdev_num_qps(struct hinic_hwdev *hwdev);
>
> +void hinic_update_num_qps(struct hinic_hwdev *hwdev, u16 num_qp);
> +
> struct hinic_sq *hinic_hwdev_get_sq(struct hinic_hwdev *hwdev, int i);
>
> struct hinic_rq *hinic_hwdev_get_rq(struct hinic_hwdev *hwdev, int i);
> diff --git a/drivers/net/ethernet/huawei/hinic/hinic_main.c b/drivers/net/ethernet/huawei/hinic/hinic_main.c
> index e3ff119fe341..5a130c982a02 100644
> --- a/drivers/net/ethernet/huawei/hinic/hinic_main.c
> +++ b/drivers/net/ethernet/huawei/hinic/hinic_main.c
> @@ -326,7 +326,6 @@ static void hinic_enable_rss(struct hinic_dev *nic_dev)
> int i, node, err = 0;
> u16 num_cpus = 0;
>
> - nic_dev->max_qps = hinic_hwdev_max_num_qps(hwdev);
> if (nic_dev->max_qps <= 1) {
> nic_dev->flags &= ~HINIC_RSS_ENABLE;
> nic_dev->rss_limit = nic_dev->max_qps;
> @@ -1043,6 +1042,10 @@ static int nic_dev_init(struct pci_dev *pdev)
> nic_dev->rq_depth = HINIC_RQ_DEPTH;
> nic_dev->sriov_info.hwdev = hwdev;
> nic_dev->sriov_info.pdev = pdev;
> + nic_dev->max_qps = num_qps;
> +
> + if (nic_dev->max_qps > 1)
> + nic_dev->flags |= HINIC_RSS_ENABLE;
>
> sema_init(&nic_dev->mgmt_lock, 1);
>
> diff --git a/drivers/net/ethernet/huawei/hinic/hinic_tx.c b/drivers/net/ethernet/huawei/hinic/hinic_tx.c
> index 4c66a0bc1b28..6da761d7a6ef 100644
> --- a/drivers/net/ethernet/huawei/hinic/hinic_tx.c
> +++ b/drivers/net/ethernet/huawei/hinic/hinic_tx.c
> @@ -470,6 +470,11 @@ netdev_tx_t hinic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
> struct hinic_txq *txq;
> struct hinic_qp *qp;
>
> + if (unlikely(!netif_carrier_ok(netdev))) {
> + dev_kfree_skb_any(skb);
> + return NETDEV_TX_OK;
> + }
Why do you need this? How is it supposed to be synchronized in the first
place, the link can go down two instructions after you do the check.
> txq = &nic_dev->txqs[q_id];
> qp = container_of(txq->sq, struct hinic_qp, sq);
>
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