Re: [PATCH v1] IB/core: Add generic function to extract IB speed from netdev

[Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>]

On Wed, Jun 07, 2017 at 07:50:22PM +0300, Leon Romanovsky wrote:
> On Tue, Jun 06, 2017 at 10:36:22PM +0300, Yuval Shaia wrote:
> > Logic of retrieving netdev speed from net_device and translating it to IB
> > speed is implemented in rxe, in usnic and in bnxt drivers.
> >
> > Define new function which merges all.
> >
> > Signed-off-by: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
> > ---
> > v0 -> v1:
> > 	* Invite usnic to the party.
> >
> > Please note that this patch kills the following mail threads:
> > 	* [PATCH] IB/bnxt_re: Check return value from get_link_ksettings
> > 	* [PATCH 1/2] IB/rxe: Check return value from get_settings
> > 	* [PATCH 2/2] IB/rxe: Protect call to get_link_ksettings with rtnl lock
> > ---
> >  drivers/infiniband/core/verbs.c              | 52 ++++++++++++++++++++++++++++
> >  drivers/infiniband/hw/bnxt_re/ib_verbs.c     | 48 ++-----------------------
> >  drivers/infiniband/hw/usnic/usnic_ib_verbs.c | 27 ++-------------
> >  drivers/infiniband/sw/rxe/rxe_verbs.c        | 43 +----------------------
> >  include/rdma/ib_verbs.h                      |  1 +
> >  5 files changed, 58 insertions(+), 113 deletions(-)
> >
> > diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
> > index 4792f52..de40434 100644
> > --- a/drivers/infiniband/core/verbs.c
> > +++ b/drivers/infiniband/core/verbs.c
> > @@ -1253,6 +1253,58 @@ int ib_resolve_eth_dmac(struct ib_device *device,
> >  }
> >  EXPORT_SYMBOL(ib_resolve_eth_dmac);
> >
> > +void ib_get_speed(struct net_device *netdev, u8 *speed, u8 *width)
> > +{
> > +	int rc;
> > +	u32 netdev_speed = SPEED_UNKNOWN;
> > +

[1]

> > +	if (netdev->ethtool_ops->get_link_ksettings) {
> > +		struct ethtool_link_ksettings lksettings;
> > +
> > +		rtnl_lock();
> > +		rc = netdev->ethtool_ops->get_link_ksettings(netdev,
> > +							     &lksettings);
> > +		rtnl_unlock();
> > +
> > +		if (!rc)
> > +			netdev_speed = lksettings.base.speed;
> > +	} else if (netdev->ethtool_ops->get_settings) {
> > +		struct ethtool_cmd cmd;
> > +
> > +		rc = netdev->ethtool_ops->get_settings(netdev, &cmd);
> > +
> > +		if (!rc)
> > +			netdev_speed = cmd.speed;
> > +	}

[2]

> > +
> > +	if (netdev_speed == SPEED_UNKNOWN) {
> > +		netdev_speed = SPEED_1000;
> > +		pr_warn("%s speed is unknown, defaulting to %d\n", netdev->name,
> > +			netdev_speed);
> > +	}
> 
> Are you sure that it works for usnic?
> I didn't check in the code, but from the patch usnic doesn't depend on
> "netdev->ethtool_ops" and in its case, you will be here with
> netdev_speed == SPEED_UNKNOWN.

Looking at __ethtool_get_link_ksettings, which is what usnic is using and
it is doing the exact flow as above so we should be fine.
However, this makes me think maybe to replace the above ([1] to [2]) with a
call to __ethtool_get_link_ksettings.

What do you think?

> 
> 
> > +
> > +	if (netdev_speed <= SPEED_1000) {
> > +		*width = IB_WIDTH_1X;
> > +		*speed = IB_SPEED_SDR;
> > +	} else if (netdev_speed <= SPEED_10000) {
> > +		*width = IB_WIDTH_1X;
> > +		*speed = IB_SPEED_FDR10;
> > +	} else if (netdev_speed <= SPEED_20000) {
> > +		*width = IB_WIDTH_4X;
> > +		*speed = IB_SPEED_DDR;
> > +	} else if (netdev_speed <= SPEED_25000) {
> > +		*width = IB_WIDTH_1X;
> > +		*speed = IB_SPEED_EDR;
> > +	} else if (netdev_speed <= SPEED_40000) {
> > +		*width = IB_WIDTH_4X;
> > +		*speed = IB_SPEED_FDR10;
> > +	} else {
> > +		*width = IB_WIDTH_4X;
> > +		*speed = IB_SPEED_EDR;
> > +	}
> > +}
> > +EXPORT_SYMBOL(ib_get_speed);
> > +
> >  int ib_modify_qp(struct ib_qp *qp,
> >  		 struct ib_qp_attr *qp_attr,
> >  		 int qp_attr_mask)
> > diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
> > index 7ba9e69..9a34c06 100644
> > --- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
> > +++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
> > @@ -181,50 +181,6 @@ int bnxt_re_modify_device(struct ib_device *ibdev,
> >  	return 0;
> >  }
> >
> > -static void __to_ib_speed_width(struct net_device *netdev, u8 *speed, u8 *width)
> > -{
> > -	struct ethtool_link_ksettings lksettings;
> > -	u32 espeed;
> > -
> > -	if (netdev->ethtool_ops && netdev->ethtool_ops->get_link_ksettings) {
> > -		memset(&lksettings, 0, sizeof(lksettings));
> > -		rtnl_lock();
> > -		netdev->ethtool_ops->get_link_ksettings(netdev, &lksettings);
> > -		rtnl_unlock();
> > -		espeed = lksettings.base.speed;
> > -	} else {
> > -		espeed = SPEED_UNKNOWN;
> > -	}
> > -	switch (espeed) {
> > -	case SPEED_1000:
> > -		*speed = IB_SPEED_SDR;
> > -		*width = IB_WIDTH_1X;
> > -		break;
> > -	case SPEED_10000:
> > -		*speed = IB_SPEED_QDR;
> > -		*width = IB_WIDTH_1X;
> > -		break;
> > -	case SPEED_20000:
> > -		*speed = IB_SPEED_DDR;
> > -		*width = IB_WIDTH_4X;
> > -		break;
> > -	case SPEED_25000:
> > -		*speed = IB_SPEED_EDR;
> > -		*width = IB_WIDTH_1X;
> > -		break;
> > -	case SPEED_40000:
> > -		*speed = IB_SPEED_QDR;
> > -		*width = IB_WIDTH_4X;
> > -		break;
> > -	case SPEED_50000:
> > -		break;
> > -	default:
> > -		*speed = IB_SPEED_SDR;
> > -		*width = IB_WIDTH_1X;
> > -		break;
> > -	}
> > -}
> > -
> >  /* Port */
> >  int bnxt_re_query_port(struct ib_device *ibdev, u8 port_num,
> >  		       struct ib_port_attr *port_attr)
> > @@ -266,8 +222,8 @@ int bnxt_re_query_port(struct ib_device *ibdev, u8 port_num,
> >  	 * IB stack to avoid race in the NETDEV_UNREG path
> >  	 */
> >  	if (test_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags))
> > -		__to_ib_speed_width(rdev->netdev, &port_attr->active_speed,
> > -				    &port_attr->active_width);
> > +		ib_get_speed(rdev->netdev, &port_attr->active_speed,
> > +			     &port_attr->active_width);
> >  	return 0;
> >  }
> >
> > diff --git a/drivers/infiniband/hw/usnic/usnic_ib_verbs.c b/drivers/infiniband/hw/usnic/usnic_ib_verbs.c
> > index 4996984..097a3b1 100644
> > --- a/drivers/infiniband/hw/usnic/usnic_ib_verbs.c
> > +++ b/drivers/infiniband/hw/usnic/usnic_ib_verbs.c
> > @@ -226,27 +226,6 @@ static void qp_grp_destroy(struct usnic_ib_qp_grp *qp_grp)
> >  	spin_unlock(&vf->lock);
> >  }
> >
> > -static void eth_speed_to_ib_speed(int speed, u8 *active_speed,
> > -					u8 *active_width)
> > -{
> > -	if (speed <= 10000) {
> > -		*active_width = IB_WIDTH_1X;
> > -		*active_speed = IB_SPEED_FDR10;
> > -	} else if (speed <= 20000) {
> > -		*active_width = IB_WIDTH_4X;
> > -		*active_speed = IB_SPEED_DDR;
> > -	} else if (speed <= 30000) {
> > -		*active_width = IB_WIDTH_4X;
> > -		*active_speed = IB_SPEED_QDR;
> > -	} else if (speed <= 40000) {
> > -		*active_width = IB_WIDTH_4X;
> > -		*active_speed = IB_SPEED_FDR10;
> > -	} else {
> > -		*active_width = IB_WIDTH_4X;
> > -		*active_speed = IB_SPEED_EDR;
> > -	}
> > -}
> > -
> >  static int create_qp_validate_user_data(struct usnic_ib_create_qp_cmd cmd)
> >  {
> >  	if (cmd.spec.trans_type <= USNIC_TRANSPORT_UNKNOWN ||
> > @@ -326,12 +305,12 @@ int usnic_ib_query_port(struct ib_device *ibdev, u8 port,
> >  				struct ib_port_attr *props)
> >  {
> >  	struct usnic_ib_dev *us_ibdev = to_usdev(ibdev);
> > -	struct ethtool_link_ksettings cmd;
> >
> >  	usnic_dbg("\n");
> >
> >  	mutex_lock(&us_ibdev->usdev_lock);
> > -	__ethtool_get_link_ksettings(us_ibdev->netdev, &cmd);
> > +	ib_get_speed(us_ibdev->netdev, &props->active_speed,
> > +		     &props->active_width);
> >  	/* props being zeroed by the caller, avoid zeroing it here */
> >
> >  	props->lid = 0;
> > @@ -355,8 +334,6 @@ int usnic_ib_query_port(struct ib_device *ibdev, u8 port,
> >  	props->pkey_tbl_len = 1;
> >  	props->bad_pkey_cntr = 0;
> >  	props->qkey_viol_cntr = 0;
> > -	eth_speed_to_ib_speed(cmd.base.speed, &props->active_speed,
> > -			      &props->active_width);
> >  	props->max_mtu = IB_MTU_4096;
> >  	props->active_mtu = iboe_get_mtu(us_ibdev->ufdev->mtu);
> >  	/* Userspace will adjust for hdrs */
> > diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c
> > index 83d709e..cdac9f2 100644
> > --- a/drivers/infiniband/sw/rxe/rxe_verbs.c
> > +++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
> > @@ -51,36 +51,11 @@ static int rxe_query_device(struct ib_device *dev,
> >  	return 0;
> >  }
> >
> > -static void rxe_eth_speed_to_ib_speed(int speed, u8 *active_speed,
> > -				      u8 *active_width)
> > -{
> > -	if (speed <= 1000) {
> > -		*active_width = IB_WIDTH_1X;
> > -		*active_speed = IB_SPEED_SDR;
> > -	} else if (speed <= 10000) {
> > -		*active_width = IB_WIDTH_1X;
> > -		*active_speed = IB_SPEED_FDR10;
> > -	} else if (speed <= 20000) {
> > -		*active_width = IB_WIDTH_4X;
> > -		*active_speed = IB_SPEED_DDR;
> > -	} else if (speed <= 30000) {
> > -		*active_width = IB_WIDTH_4X;
> > -		*active_speed = IB_SPEED_QDR;
> > -	} else if (speed <= 40000) {
> > -		*active_width = IB_WIDTH_4X;
> > -		*active_speed = IB_SPEED_FDR10;
> > -	} else {
> > -		*active_width = IB_WIDTH_4X;
> > -		*active_speed = IB_SPEED_EDR;
> > -	}
> > -}
> > -
> >  static int rxe_query_port(struct ib_device *dev,
> >  			  u8 port_num, struct ib_port_attr *attr)
> >  {
> >  	struct rxe_dev *rxe = to_rdev(dev);
> >  	struct rxe_port *port;
> > -	u32 speed;
> >
> >  	if (unlikely(port_num != 1)) {
> >  		pr_warn("invalid port_number %d\n", port_num);
> > @@ -93,23 +68,7 @@ static int rxe_query_port(struct ib_device *dev,
> >  	*attr = port->attr;
> >
> >  	mutex_lock(&rxe->usdev_lock);
> > -	if (rxe->ndev->ethtool_ops->get_link_ksettings) {
> > -		struct ethtool_link_ksettings ks;
> > -
> > -		rxe->ndev->ethtool_ops->get_link_ksettings(rxe->ndev, &ks);
> > -		speed = ks.base.speed;
> > -	} else if (rxe->ndev->ethtool_ops->get_settings) {
> > -		struct ethtool_cmd cmd;
> > -
> > -		rxe->ndev->ethtool_ops->get_settings(rxe->ndev, &cmd);
> > -		speed = cmd.speed;
> > -	} else {
> > -		pr_warn("%s speed is unknown, defaulting to 1000\n",
> > -			rxe->ndev->name);
> > -		speed = 1000;
> > -	}
> > -	rxe_eth_speed_to_ib_speed(speed, &attr->active_speed,
> > -				  &attr->active_width);
> > +	ib_get_speed(rxe->ndev, &attr->active_speed, &attr->active_width);
> >  	mutex_unlock(&rxe->usdev_lock);
> >
> >  	return 0;
> > diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
> > index ba8314e..2c57f32 100644
> > --- a/include/rdma/ib_verbs.h
> > +++ b/include/rdma/ib_verbs.h
> > @@ -3488,6 +3488,7 @@ void ib_drain_qp(struct ib_qp *qp);
> >
> >  int ib_resolve_eth_dmac(struct ib_device *device,
> >  			struct rdma_ah_attr *ah_attr);
> > +void ib_get_speed(struct net_device *netdev, u8 *speed, u8 *width);
> >
> >  static inline u8 *rdma_ah_retrieve_dmac(struct rdma_ah_attr *attr)
> >  {
> > --
> > 2.9.4
> >
> > --
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