Commit 6090a0c4 authored by Bob Pearson's avatar Bob Pearson Committed by Jason Gunthorpe

RDMA/rxe: Cleanup rxe_mcast.c

Finish adding subroutine comment headers to subroutines in
rxe_mcast.c. Make minor api change cleanups.

Link: https://lore.kernel.org/r/20220223230706.50332-5-rpearsonhpe@gmail.comSigned-off-by: default avatarBob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@nvidia.com>
parent a181c4c8
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
* Copyright (c) 2022 Hewlett Packard Enterprise, Inc. All rights reserved.
* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
*/
/*
* rxe_mcast.c implements driver support for multicast transport.
* It is based on two data structures struct rxe_mcg ('mcg') and
* struct rxe_mca ('mca'). An mcg is allocated each time a qp is
* attached to a new mgid for the first time. These are indexed by
* a red-black tree using the mgid. This data structure is searched
* for the mcg when a multicast packet is received and when another
* qp is attached to the same mgid. It is cleaned up when the last qp
* is detached from the mcg. Each time a qp is attached to an mcg an
* mca is created. It holds a pointer to the qp and is added to a list
* of qp's that are attached to the mcg. The qp_list is used to replicate
* mcast packets in the rxe receive path.
*/
#include "rxe.h"
#include "rxe_loc.h"
/**
* rxe_mcast_add - add multicast address to rxe device
* @rxe: rxe device object
* @mgid: multicast address as a gid
*
* Returns 0 on success else an error
*/
static int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)
{
unsigned char ll_addr[ETH_ALEN];
......@@ -16,6 +37,13 @@ static int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid)
return dev_mc_add(rxe->ndev, ll_addr);
}
/**
* rxe_mcast_delete - delete multicast address from rxe device
* @rxe: rxe device object
* @mgid: multicast address as a gid
*
* Returns 0 on success else an error
*/
static int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid)
{
unsigned char ll_addr[ETH_ALEN];
......@@ -216,7 +244,7 @@ static struct rxe_mcg *rxe_get_mcg(struct rxe_dev *rxe, union ib_gid *mgid)
/**
* rxe_cleanup_mcg - cleanup mcg for kref_put
* @kref:
* @kref: struct kref embnedded in mcg
*/
void rxe_cleanup_mcg(struct kref *kref)
{
......@@ -299,9 +327,17 @@ static int __rxe_init_mca(struct rxe_qp *qp, struct rxe_mcg *mcg,
return 0;
}
static int rxe_attach_mcg(struct rxe_dev *rxe, struct rxe_qp *qp,
struct rxe_mcg *mcg)
/**
* rxe_attach_mcg - attach qp to mcg if not already attached
* @qp: qp object
* @mcg: mcg object
*
* Context: caller must hold reference on qp and mcg.
* Returns: 0 on success else an error
*/
static int rxe_attach_mcg(struct rxe_mcg *mcg, struct rxe_qp *qp)
{
struct rxe_dev *rxe = mcg->rxe;
struct rxe_mca *mca, *tmp;
unsigned long flags;
int err;
......@@ -358,17 +394,19 @@ static void __rxe_cleanup_mca(struct rxe_mca *mca, struct rxe_mcg *mcg)
kfree(mca);
}
static int rxe_detach_mcg(struct rxe_dev *rxe, struct rxe_qp *qp,
union ib_gid *mgid)
/**
* rxe_detach_mcg - detach qp from mcg
* @mcg: mcg object
* @qp: qp object
*
* Returns: 0 on success else an error if qp is not attached.
*/
static int rxe_detach_mcg(struct rxe_mcg *mcg, struct rxe_qp *qp)
{
struct rxe_mcg *mcg;
struct rxe_dev *rxe = mcg->rxe;
struct rxe_mca *mca, *tmp;
unsigned long flags;
mcg = rxe_lookup_mcg(rxe, mgid);
if (!mcg)
return -EINVAL;
spin_lock_irqsave(&rxe->mcg_lock, flags);
list_for_each_entry_safe(mca, tmp, &mcg->qp_list, qp_list) {
if (mca->qp == qp) {
......@@ -378,16 +416,11 @@ static int rxe_detach_mcg(struct rxe_dev *rxe, struct rxe_qp *qp,
* mcast group falls to zero go ahead and
* tear it down. This will not free the
* object since we are still holding a ref
* from the get key above
* from the caller
*/
if (atomic_read(&mcg->qp_num) <= 0)
__rxe_destroy_mcg(mcg);
/* drop the ref from get key. This will free the
* object if qp_num is zero.
*/
kref_put(&mcg->ref_cnt, rxe_cleanup_mcg);
spin_unlock_irqrestore(&rxe->mcg_lock, flags);
return 0;
}
......@@ -398,6 +431,14 @@ static int rxe_detach_mcg(struct rxe_dev *rxe, struct rxe_qp *qp,
return -EINVAL;
}
/**
* rxe_attach_mcast - attach qp to multicast group (see IBA-11.3.1)
* @ibqp: (IB) qp object
* @mgid: multicast IP address
* @mlid: multicast LID, ignored for RoCEv2 (see IBA-A17.5.6)
*
* Returns: 0 on success else an errno
*/
int rxe_attach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid)
{
int err;
......@@ -410,20 +451,38 @@ int rxe_attach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid)
if (IS_ERR(mcg))
return PTR_ERR(mcg);
err = rxe_attach_mcg(rxe, qp, mcg);
err = rxe_attach_mcg(mcg, qp);
/* if we failed to attach the first qp to mcg tear it down */
if (atomic_read(&mcg->qp_num) == 0)
rxe_destroy_mcg(mcg);
kref_put(&mcg->ref_cnt, rxe_cleanup_mcg);
return err;
}
/**
* rxe_detach_mcast - detach qp from multicast group (see IBA-11.3.2)
* @ibqp: address of (IB) qp object
* @mgid: multicast IP address
* @mlid: multicast LID, ignored for RoCEv2 (see IBA-A17.5.6)
*
* Returns: 0 on success else an errno
*/
int rxe_detach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid)
{
struct rxe_dev *rxe = to_rdev(ibqp->device);
struct rxe_qp *qp = to_rqp(ibqp);
struct rxe_mcg *mcg;
int err;
mcg = rxe_lookup_mcg(rxe, mgid);
if (!mcg)
return -EINVAL;
return rxe_detach_mcg(rxe, qp, mgid);
err = rxe_detach_mcg(mcg, qp);
kref_put(&mcg->ref_cnt, rxe_cleanup_mcg);
return err;
}
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