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IB/mlx4: Add support for blocking multicast loopback packets 

Add support for handling the IB_QP_CREATE_MULTICAST_BLOCK_LOOPBACK
flag by using the per-multicast group loopback blocking feature of
mlx4 hardware.

Signed-off-by: Ron Livne <ronli@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Ron Livne 2008-07-14 23:48:48 -07:00 committed by Roland Dreier
parent 47ee1b9f2e
commit 521e575b9a
5 changed files with 40 additions and 11 deletions
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7
drivers/infiniband/hw/mlx4/main.c
View File

@ -90,7 +90,8 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
props->device_cap_flags = IB_DEVICE_CHANGE_PHY_PORT |
IB_DEVICE_PORT_ACTIVE_EVENT |
IB_DEVICE_SYS_IMAGE_GUID |
IB_DEVICE_RC_RNR_NAK_GEN;
IB_DEVICE_RC_RNR_NAK_GEN |
IB_DEVICE_BLOCK_MULTICAST_LOOPBACK;
if (dev->dev->caps.flags & MLX4_DEV_CAP_FLAG_BAD_PKEY_CNTR)
props->device_cap_flags |= IB_DEVICE_BAD_PKEY_CNTR;
if (dev->dev->caps.flags & MLX4_DEV_CAP_FLAG_BAD_QKEY_CNTR)
@ -437,7 +438,9 @@ static int mlx4_ib_dealloc_pd(struct ib_pd *pd)
static int mlx4_ib_mcg_attach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
{
return mlx4_multicast_attach(to_mdev(ibqp->device)->dev,
&to_mqp(ibqp)->mqp, gid->raw);
&to_mqp(ibqp)->mqp, gid->raw,
!!(to_mqp(ibqp)->flags &
MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK));
}
static int mlx4_ib_mcg_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)

3
drivers/infiniband/hw/mlx4/mlx4_ib.h
View File

@ -101,7 +101,8 @@ struct mlx4_ib_wq {
};
enum mlx4_ib_qp_flags {
MLX4_IB_QP_LSO = 1 << 0
MLX4_IB_QP_LSO = 1 << 0,
MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK = 1 << 1,
};
struct mlx4_ib_qp {

21
drivers/infiniband/hw/mlx4/qp.c
View File

@ -511,6 +511,9 @@ static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
} else {
qp->sq_no_prefetch = 0;
if (init_attr->create_flags & IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK)
qp->flags |= MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK;
if (init_attr->create_flags & IB_QP_CREATE_IPOIB_UD_LSO)
qp->flags |= MLX4_IB_QP_LSO;
@ -684,10 +687,15 @@ struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
struct mlx4_ib_qp *qp;
int err;
/* We only support LSO, and only for kernel UD QPs. */
if (init_attr->create_flags & ~IB_QP_CREATE_IPOIB_UD_LSO)
/*
* We only support LSO and multicast loopback blocking, and
* only for kernel UD QPs.
*/
if (init_attr->create_flags & ~(IB_QP_CREATE_IPOIB_UD_LSO |
IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK))
return ERR_PTR(-EINVAL);
if (init_attr->create_flags & IB_QP_CREATE_IPOIB_UD_LSO &&
if (init_attr->create_flags &&
(pd->uobject || init_attr->qp_type != IB_QPT_UD))
return ERR_PTR(-EINVAL);
@ -1844,6 +1852,13 @@ done:
qp_init_attr->cap = qp_attr->cap;
qp_init_attr->create_flags = 0;
if (qp->flags & MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK)
qp_init_attr->create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK;
if (qp->flags & MLX4_IB_QP_LSO)
qp_init_attr->create_flags |= IB_QP_CREATE_IPOIB_UD_LSO;
out:
mutex_unlock(&qp->mutex);
return err;

17
drivers/net/mlx4/mcg.c
View File

@ -38,6 +38,9 @@
#include "mlx4.h"
#define MGM_QPN_MASK 0x00FFFFFF
#define MGM_BLCK_LB_BIT 30
struct mlx4_mgm {
__be32 next_gid_index;
__be32 members_count;
@ -153,7 +156,8 @@ static int find_mgm(struct mlx4_dev *dev,
return err;
}
int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
int block_mcast_loopback)
{
struct mlx4_priv *priv = mlx4_priv(dev);
struct mlx4_cmd_mailbox *mailbox;
@ -202,13 +206,18 @@ int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
}
for (i = 0; i < members_count; ++i)
if (mgm->qp[i] == cpu_to_be32(qp->qpn)) {
if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn) {
mlx4_dbg(dev, "QP %06x already a member of MGM\n", qp->qpn);
err = 0;
goto out;
}
mgm->qp[members_count++] = cpu_to_be32(qp->qpn);
if (block_mcast_loopback)
mgm->qp[members_count++] = cpu_to_be32((qp->qpn & MGM_QPN_MASK) |
(1 << MGM_BLCK_LB_BIT));
else
mgm->qp[members_count++] = cpu_to_be32(qp->qpn & MGM_QPN_MASK);
mgm->members_count = cpu_to_be32(members_count);
err = mlx4_WRITE_MCG(dev, index, mailbox);
@ -283,7 +292,7 @@ int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16])
members_count = be32_to_cpu(mgm->members_count);
for (loc = -1, i = 0; i < members_count; ++i)
if (mgm->qp[i] == cpu_to_be32(qp->qpn))
if ((be32_to_cpu(mgm->qp[i]) & MGM_QPN_MASK) == qp->qpn)
loc = i;
if (loc == -1) {

3
include/linux/mlx4/device.h
View File

@ -398,7 +398,8 @@ int mlx4_srq_query(struct mlx4_dev *dev, struct mlx4_srq *srq, int *limit_waterm
int mlx4_INIT_PORT(struct mlx4_dev *dev, int port);
int mlx4_CLOSE_PORT(struct mlx4_dev *dev, int port);
int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16]);
int mlx4_multicast_attach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16],
int block_mcast_loopback);
int mlx4_multicast_detach(struct mlx4_dev *dev, struct mlx4_qp *qp, u8 gid[16]);
int mlx4_map_phys_fmr(struct mlx4_dev *dev, struct mlx4_fmr *fmr, u64 *page_list,