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Date: Thu, 30 Dec 2021 16:19:54 +0200
From: Ido Schimmel <idosch@...sch.org>
To: Yevhen Orlov <yevhen.orlov@...ision.eu>
Cc: netdev@...r.kernel.org, stephen@...workplumber.org, andrew@...n.ch,
Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
Taras Chornyi <taras.chornyi@...ision.eu>,
Mickey Rachamim <mickeyr@...vell.com>,
Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
Taras Chornyi <tchornyi@...vell.com>,
Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 4/6] net: marvell: prestera: add hardware
router objects accounting
On Mon, Dec 27, 2021 at 11:52:29PM +0200, Yevhen Orlov wrote:
> Add prestera_router_hw.c. This file contains functions, which track HW
> objects relations and links. This include implicity creation of objects,
> that needed by requested one and implicity removing of objects, which
> reference counter is became zero.
>
> We need this layer, because kernel callbacks not always mapped to
> creation of single HW object. So let it be two different layers - one
> for subscribing and parsing kernel structures, and another
> (prestera_router_hw.c) for HW objects relations tracking.
>
> There is two types of objects on router_hw layer:
> - Explicit objects (rif_entry) : created by higher layer.
> - Implicit objects (vr) : created on demand by explicit objects.
>
> Co-developed-by: Taras Chornyi <tchornyi@...vell.com>
> Signed-off-by: Taras Chornyi <tchornyi@...vell.com>
> Co-developed-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
> Signed-off-by: Oleksandr Mazur <oleksandr.mazur@...ision.eu>
> Signed-off-by: Yevhen Orlov <yevhen.orlov@...ision.eu>
> ---
> v1-->v2
> * No changes
> ---
> .../net/ethernet/marvell/prestera/Makefile | 2 +-
> .../marvell/prestera/prestera_router.c | 10 +
> .../marvell/prestera/prestera_router_hw.c | 209 ++++++++++++++++++
> .../marvell/prestera/prestera_router_hw.h | 36 +++
> 4 files changed, 256 insertions(+), 1 deletion(-)
> create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_router_hw.c
> create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_router_hw.h
>
> diff --git a/drivers/net/ethernet/marvell/prestera/Makefile b/drivers/net/ethernet/marvell/prestera/Makefile
> index ec69fc564a9f..d395f4131648 100644
> --- a/drivers/net/ethernet/marvell/prestera/Makefile
> +++ b/drivers/net/ethernet/marvell/prestera/Makefile
> @@ -4,6 +4,6 @@ prestera-objs := prestera_main.o prestera_hw.o prestera_dsa.o \
> prestera_rxtx.o prestera_devlink.o prestera_ethtool.o \
> prestera_switchdev.o prestera_acl.o prestera_flow.o \
> prestera_flower.o prestera_span.o prestera_counter.o \
> - prestera_router.o
> + prestera_router.o prestera_router_hw.o
>
> obj-$(CONFIG_PRESTERA_PCI) += prestera_pci.o
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router.c b/drivers/net/ethernet/marvell/prestera/prestera_router.c
> index f3980d10eb29..2a32831df40f 100644
> --- a/drivers/net/ethernet/marvell/prestera/prestera_router.c
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_router.c
> @@ -5,10 +5,12 @@
> #include <linux/types.h>
>
> #include "prestera.h"
> +#include "prestera_router_hw.h"
>
> int prestera_router_init(struct prestera_switch *sw)
> {
> struct prestera_router *router;
> + int err;
>
> router = kzalloc(sizeof(*sw->router), GFP_KERNEL);
> if (!router)
> @@ -17,7 +19,15 @@ int prestera_router_init(struct prestera_switch *sw)
> sw->router = router;
> router->sw = sw;
>
> + err = prestera_router_hw_init(sw);
> + if (err)
> + goto err_router_lib_init;
> +
> return 0;
> +
> +err_router_lib_init:
> + kfree(sw->router);
> + return err;
> }
>
> void prestera_router_fini(struct prestera_switch *sw)
Looks suspicious that you don't call prestera_router_hw_fini() here. You
can at least verify that the two lists you initialize in
prestera_router_hw_init() are indeed empty.
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router_hw.c b/drivers/net/ethernet/marvell/prestera/prestera_router_hw.c
> new file mode 100644
> index 000000000000..4f66fb21a299
> --- /dev/null
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_router_hw.c
> @@ -0,0 +1,209 @@
> +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
> +/* Copyright (c) 2019-2021 Marvell International Ltd. All rights reserved */
> +
> +#include <linux/rhashtable.h>
> +
> +#include "prestera.h"
> +#include "prestera_hw.h"
> +#include "prestera_router_hw.h"
> +#include "prestera_acl.h"
> +
> +/* +--+
> + * +------->|vr|
> + * | +--+
> + * |
> + * +-+-------+
> + * |rif_entry|
> + * +---------+
> + * Rif is
> + * used as
> + * entry point
> + * for vr in hw
> + */
> +
> +int prestera_router_hw_init(struct prestera_switch *sw)
> +{
> + INIT_LIST_HEAD(&sw->router->vr_list);
> + INIT_LIST_HEAD(&sw->router->rif_entry_list);
> +
> + return 0;
> +}
> +
> +static struct prestera_vr *__prestera_vr_find(struct prestera_switch *sw,
> + u32 tb_id)
> +{
> + struct prestera_vr *vr;
> +
> + list_for_each_entry(vr, &sw->router->vr_list, router_node) {
Probably better to store VRs in something like IDR instead of a linked
list
> + if (vr->tb_id == tb_id)
> + return vr;
> + }
> +
> + return NULL;
> +}
> +
> +static struct prestera_vr *__prestera_vr_create(struct prestera_switch *sw,
> + u32 tb_id,
> + struct netlink_ext_ack *extack)
> +{
> + struct prestera_vr *vr;
> + u16 hw_vr_id;
> + int err;
> +
> + err = prestera_hw_vr_create(sw, &hw_vr_id);
> + if (err)
> + return ERR_PTR(-ENOMEM);
> +
> + vr = kzalloc(sizeof(*vr), GFP_KERNEL);
> + if (!vr) {
> + err = -ENOMEM;
> + goto err_alloc_vr;
> + }
> +
> + vr->tb_id = tb_id;
> + vr->hw_vr_id = hw_vr_id;
> +
> + list_add(&vr->router_node, &sw->router->vr_list);
> +
> + return vr;
> +
> +err_alloc_vr:
> + prestera_hw_vr_delete(sw, hw_vr_id);
> + kfree(vr);
You failed to allocate it, so no need to free it
> + return ERR_PTR(err);
> +}
> +
> +static void __prestera_vr_destroy(struct prestera_switch *sw,
> + struct prestera_vr *vr)
> +{
> + prestera_hw_vr_delete(sw, vr->hw_vr_id);
> + list_del(&vr->router_node);
Not symmetric with __prestera_vr_create()
> + kfree(vr);
> +}
> +
> +static struct prestera_vr *prestera_vr_get(struct prestera_switch *sw, u32 tb_id,
> + struct netlink_ext_ack *extack)
> +{
> + struct prestera_vr *vr;
> +
> + vr = __prestera_vr_find(sw, tb_id);
> + if (!vr)
> + vr = __prestera_vr_create(sw, tb_id, extack);
> + if (IS_ERR(vr))
> + return ERR_CAST(vr);
> +
> + return vr;
> +}
> +
> +static void prestera_vr_put(struct prestera_switch *sw, struct prestera_vr *vr)
> +{
> + if (!vr->ref_cnt)
> + __prestera_vr_destroy(sw, vr);
> +}
These two functions should increase/decrease the reference count of the
VR
> +
> +/* iface is overhead struct. vr_id also can be removed. */
Unclear
> +static int
> +__prestera_rif_entry_key_copy(const struct prestera_rif_entry_key *in,
> + struct prestera_rif_entry_key *out)
> +{
> + memset(out, 0, sizeof(*out));
> +
> + switch (in->iface.type) {
> + case PRESTERA_IF_PORT_E:
> + out->iface.dev_port.hw_dev_num = in->iface.dev_port.hw_dev_num;
> + out->iface.dev_port.port_num = in->iface.dev_port.port_num;
> + break;
> + case PRESTERA_IF_LAG_E:
> + out->iface.lag_id = in->iface.lag_id;
> + break;
> + case PRESTERA_IF_VID_E:
> + out->iface.vlan_id = in->iface.vlan_id;
> + break;
> + default:
> + pr_err("Unsupported iface type");
If this should never happen, then consider using WARN_ON(1)
> + return -EINVAL;
> + }
> +
> + out->iface.type = in->iface.type;
> + return 0;
> +}
> +
> +struct prestera_rif_entry *
> +prestera_rif_entry_find(const struct prestera_switch *sw,
> + const struct prestera_rif_entry_key *k)
> +{
> + struct prestera_rif_entry *rif_entry;
> + struct prestera_rif_entry_key lk; /* lookup key */
> +
> + if (__prestera_rif_entry_key_copy(k, &lk))
> + return NULL;
> +
> + list_for_each_entry(rif_entry, &sw->router->rif_entry_list,
> + router_node) {
> + if (!memcmp(k, &rif_entry->key, sizeof(*k)))
> + return rif_entry;
Looks like rhashtable is a better option than a linked list
> + }
> +
> + return NULL;
> +}
> +
> +void prestera_rif_entry_destroy(struct prestera_switch *sw,
> + struct prestera_rif_entry *e)
It's easier to maintain/review code that follows a pattern of create()
followed by destroy(). You can see if the error path is the same as what
you have in destroy()
> +{
> + struct prestera_iface iface;
> +
> + list_del(&e->router_node);
> +
> + memcpy(&iface, &e->key.iface, sizeof(iface));
> + iface.vr_id = e->vr->hw_vr_id;
> + prestera_hw_rif_delete(sw, e->hw_id, &iface);
> +
> + e->vr->ref_cnt--;
> + prestera_vr_put(sw, e->vr);
> + kfree(e);
> +}
> +
> +struct prestera_rif_entry *
> +prestera_rif_entry_create(struct prestera_switch *sw,
> + struct prestera_rif_entry_key *k,
> + u32 tb_id, const unsigned char *addr)
> +{
> + int err;
> + struct prestera_rif_entry *e;
> + struct prestera_iface iface;
> +
> + e = kzalloc(sizeof(*e), GFP_KERNEL);
> + if (!e)
> + goto err_kzalloc;
> +
> + if (__prestera_rif_entry_key_copy(k, &e->key))
> + goto err_key_copy;
> +
> + e->vr = prestera_vr_get(sw, tb_id, NULL);
> + if (IS_ERR(e->vr))
> + goto err_vr_get;
> +
> + e->vr->ref_cnt++;
> + memcpy(&e->addr, addr, sizeof(e->addr));
> +
> + /* HW */
> + memcpy(&iface, &e->key.iface, sizeof(iface));
> + iface.vr_id = e->vr->hw_vr_id;
> + err = prestera_hw_rif_create(sw, &iface, e->addr, &e->hw_id);
> + if (err)
> + goto err_hw_create;
> +
> + list_add(&e->router_node, &sw->router->rif_entry_list);
> +
> + return e;
> +
> +err_hw_create:
> + e->vr->ref_cnt--;
> + prestera_vr_put(sw, e->vr);
> +err_vr_get:
> +err_key_copy:
> + kfree(e);
> +err_kzalloc:
> + return NULL;
> +}
> +
> diff --git a/drivers/net/ethernet/marvell/prestera/prestera_router_hw.h b/drivers/net/ethernet/marvell/prestera/prestera_router_hw.h
> new file mode 100644
> index 000000000000..fed53595f7bb
> --- /dev/null
> +++ b/drivers/net/ethernet/marvell/prestera/prestera_router_hw.h
> @@ -0,0 +1,36 @@
> +/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
> +/* Copyright (c) 2019-2021 Marvell International Ltd. All rights reserved. */
> +
> +#ifndef _PRESTERA_ROUTER_HW_H_
> +#define _PRESTERA_ROUTER_HW_H_
> +
> +struct prestera_vr {
> + struct list_head router_node;
> + unsigned int ref_cnt;
Use refcount_t
> + u32 tb_id; /* key (kernel fib table id) */
> + u16 hw_vr_id; /* virtual router ID */
> + u8 __pad[2];
> +};
> +
> +struct prestera_rif_entry {
> + struct prestera_rif_entry_key {
> + struct prestera_iface iface;
> + } key;
> + struct prestera_vr *vr;
> + unsigned char addr[ETH_ALEN];
> + u16 hw_id; /* rif_id */
> + struct list_head router_node; /* ht */
> +};
> +
> +struct prestera_rif_entry *
> +prestera_rif_entry_find(const struct prestera_switch *sw,
> + const struct prestera_rif_entry_key *k);
> +void prestera_rif_entry_destroy(struct prestera_switch *sw,
> + struct prestera_rif_entry *e);
> +struct prestera_rif_entry *
> +prestera_rif_entry_create(struct prestera_switch *sw,
> + struct prestera_rif_entry_key *k,
> + u32 tb_id, const unsigned char *addr);
> +int prestera_router_hw_init(struct prestera_switch *sw);
> +
> +#endif /* _PRESTERA_ROUTER_HW_H_ */
> --
> 2.17.1
>
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