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IB/rdmavt/hfi1/qib: Use the MGID and MLID for multicast addressing 

The Infiniband spec defines "A multicast address is defined by a
MGID and a MLID" (section 10.5).

The current code only uses the MGID for identifying multicast groups.
Update the driver to be compliant with this definition.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Michael J. Ruhl 2017-04-09 10:15:57 -07:00 committed by Doug Ledford
parent 8561eae60f
commit aad9ff97dd
5 changed files with 54 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/infiniband/hw/hfi1/verbs.c
View File

@ -604,7 +604,7 @@ void hfi1_ib_rcv(struct hfi1_packet *packet)
if (lnh != HFI1_LRH_GRH)
goto drop;
mcast = rvt_mcast_find(&ibp->rvp, &hdr->u.l.grh.dgid);
mcast = rvt_mcast_find(&ibp->rvp, &hdr->u.l.grh.dgid, lid);
if (!mcast)
goto drop;
list_for_each_entry_rcu(p, &mcast->qp_list, list) {

2
drivers/infiniband/hw/qib/qib_verbs.c
View File

@ -356,7 +356,7 @@ void qib_ib_rcv(struct qib_ctxtdata *rcd, void *rhdr, void *data, u32 tlen)
if (lnh != QIB_LRH_GRH)
goto drop;
mcast = rvt_mcast_find(&ibp->rvp, &hdr->u.l.grh.dgid);
mcast = rvt_mcast_find(&ibp->rvp, &hdr->u.l.grh.dgid, lid);
if (mcast == NULL)
goto drop;
this_cpu_inc(ibp->pmastats->n_multicast_rcv);

61
drivers/infiniband/sw/rdmavt/mcast.c
View File

@ -100,10 +100,11 @@ static void rvt_mcast_qp_free(struct rvt_mcast_qp *mqp)
/**
* mcast_alloc - allocate the multicast GID structure
* @mgid: the multicast GID
* @lid: the muilticast LID (host order)
*
* A list of QPs will be attached to this structure.
*/
static struct rvt_mcast *rvt_mcast_alloc(union ib_gid *mgid)
static struct rvt_mcast *rvt_mcast_alloc(union ib_gid *mgid, u16 lid)
{
struct rvt_mcast *mcast;
@ -111,7 +112,9 @@ static struct rvt_mcast *rvt_mcast_alloc(union ib_gid *mgid)
if (!mcast)
goto bail;
mcast->mgid = *mgid;
mcast->mcast_addr.mgid = *mgid;
mcast->mcast_addr.lid = lid;
INIT_LIST_HEAD(&mcast->qp_list);
init_waitqueue_head(&mcast->wait);
atomic_set(&mcast->refcount, 0);
@ -131,15 +134,19 @@ static void rvt_mcast_free(struct rvt_mcast *mcast)
}
/**
* rvt_mcast_find - search the global table for the given multicast GID
* rvt_mcast_find - search the global table for the given multicast GID/LID
* NOTE: It is valid to have 1 MLID with multiple MGIDs. It is not valid
* to have 1 MGID with multiple MLIDs.
* @ibp: the IB port structure
* @mgid: the multicast GID to search for
* @lid: the multicast LID portion of the multicast address (host order)
*
* The caller is responsible for decrementing the reference count if found.
*
* Return: NULL if not found.
*/
struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid)
struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid,
u16 lid)
{
struct rb_node *n;
unsigned long flags;
@ -153,15 +160,18 @@ struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid)
mcast = rb_entry(n, struct rvt_mcast, rb_node);
ret = memcmp(mgid->raw, mcast->mgid.raw,
sizeof(union ib_gid));
ret = memcmp(mgid->raw, mcast->mcast_addr.mgid.raw,
sizeof(*mgid));
if (ret < 0) {
n = n->rb_left;
} else if (ret > 0) {
n = n->rb_right;
} else {
atomic_inc(&mcast->refcount);
found = mcast;
/* MGID/MLID must match */
if (mcast->mcast_addr.lid == lid) {
atomic_inc(&mcast->refcount);
found = mcast;
}
break;
}
}
@ -177,7 +187,8 @@ EXPORT_SYMBOL(rvt_mcast_find);
*
* Return: zero if both were added. Return EEXIST if the GID was already in
* the table but the QP was added. Return ESRCH if the QP was already
* attached and neither structure was added.
* attached and neither structure was added. Return EINVAL if the MGID was
* found, but the MLID did NOT match.
*/
static int rvt_mcast_add(struct rvt_dev_info *rdi, struct rvt_ibport *ibp,
struct rvt_mcast *mcast, struct rvt_mcast_qp *mqp)
@ -195,8 +206,9 @@ static int rvt_mcast_add(struct rvt_dev_info *rdi, struct rvt_ibport *ibp,
pn = *n;
tmcast = rb_entry(pn, struct rvt_mcast, rb_node);
ret = memcmp(mcast->mgid.raw, tmcast->mgid.raw,
sizeof(union ib_gid));
ret = memcmp(mcast->mcast_addr.mgid.raw,
tmcast->mcast_addr.mgid.raw,
sizeof(mcast->mcast_addr.mgid));
if (ret < 0) {
n = &pn->rb_left;
continue;
@ -206,6 +218,11 @@ static int rvt_mcast_add(struct rvt_dev_info *rdi, struct rvt_ibport *ibp,
continue;
}
if (tmcast->mcast_addr.lid != mcast->mcast_addr.lid) {
ret = EINVAL;
goto bail;
}
/* Search the QP list to see if this is already there. */
list_for_each_entry_rcu(p, &tmcast->qp_list, list) {
if (p->qp == mqp->qp) {
@ -276,7 +293,7 @@ int rvt_attach_mcast(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
* Allocate data structures since its better to do this outside of
* spin locks and it will most likely be needed.
*/
mcast = rvt_mcast_alloc(gid);
mcast = rvt_mcast_alloc(gid, lid);
if (!mcast)
return -ENOMEM;
@ -296,6 +313,10 @@ int rvt_attach_mcast(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
/* Exceeded the maximum number of mcast groups. */
ret = -ENOMEM;
goto bail_mqp;
case EINVAL:
/* Invalid MGID/MLID pair */
ret = -EINVAL;
goto bail_mqp;
default:
break;
}
@ -344,14 +365,20 @@ int rvt_detach_mcast(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
}
mcast = rb_entry(n, struct rvt_mcast, rb_node);
ret = memcmp(gid->raw, mcast->mgid.raw,
sizeof(union ib_gid));
if (ret < 0)
ret = memcmp(gid->raw, mcast->mcast_addr.mgid.raw,
sizeof(*gid));
if (ret < 0) {
n = n->rb_left;
else if (ret > 0)
} else if (ret > 0) {
n = n->rb_right;
else
} else {
/* MGID/MLID must match */
if (mcast->mcast_addr.lid != lid) {
spin_unlock_irq(&ibp->lock);
return -EINVAL;
}
break;
}
}
/* Search the QP list. */

3
include/rdma/rdma_vt.h
View File

@ -516,6 +516,7 @@ int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
u32 len, u64 vaddr, u32 rkey, int acc);
int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
struct rvt_sge *isge, struct ib_sge *sge, int acc);
struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid);
struct rvt_mcast *rvt_mcast_find(struct rvt_ibport *ibp, union ib_gid *mgid,
u16 lid);
#endif /* DEF_RDMA_VT_H */

7
include/rdma/rdmavt_qp.h
View File

@ -435,9 +435,14 @@ struct rvt_mcast_qp {
struct rvt_qp *qp;
};
struct rvt_mcast_addr {
union ib_gid mgid;
u16 lid;
};
struct rvt_mcast {
struct rb_node rb_node;
union ib_gid mgid;
struct rvt_mcast_addr mcast_addr;
struct list_head qp_list;
wait_queue_head_t wait;
atomic_t refcount;