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IB/mlx4: Add support for blocking multicast loopback packets

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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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17
drivers/net/mlx4/mcg.c
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@ -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) {