Commit bb535c0d authored by Daniel Machon's avatar Daniel Machon Committed by David S. Miller
Browse files

net: microchip: sparx5: add resource pools 



Add resource pools and accessor functions. These pools can be queried by
the driver, whenever a finite resource is required. Some resources can
be reused, in which case an index and a reference count is used to keep
track of users.

Signed-off-by: default avatarDaniel Machon <daniel.machon@microchip.com>
Reviewed-by: default avatarSimon Horman <simon.horman@corigine.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent edad83e2

drivers/net/ethernet/microchip/sparx5/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -9,7 +9,8 @@ sparx5-switch-y := sparx5_main.o sparx5_packet.o \ 
 sparx5_netdev.o sparx5_phylink.o sparx5_port.o sparx5_mactable.o sparx5_vlan.o \

 sparx5_switchdev.o sparx5_calendar.o sparx5_ethtool.o sparx5_fdma.o \

 sparx5_ptp.o sparx5_pgid.o sparx5_tc.o sparx5_qos.o \

 sparx5_vcap_impl.o sparx5_vcap_ag_api.o sparx5_tc_flower.o sparx5_tc_matchall.o

 sparx5_vcap_impl.o sparx5_vcap_ag_api.o sparx5_tc_flower.o \

 sparx5_tc_matchall.o sparx5_pool.o



sparx5-switch-$(CONFIG_SPARX5_DCB) += sparx5_dcb.o

sparx5-switch-$(CONFIG_DEBUG_FS) += sparx5_vcap_debugfs.o

drivers/net/ethernet/microchip/sparx5/sparx5_main.h

+12 −0
Original line number Diff line number Diff line
@@ -413,6 +413,18 @@ int sparx5_pgid_alloc_glag(struct sparx5 *spx5, u16 *idx); 
int sparx5_pgid_alloc_mcast(struct sparx5 *spx5, u16 *idx);

int sparx5_pgid_free(struct sparx5 *spx5, u16 idx);



/* sparx5_pool.c */

struct sparx5_pool_entry {

	u16 ref_cnt;

	u32 idx; /* tc index */

};



u32 sparx5_pool_idx_to_id(u32 idx);

int sparx5_pool_put(struct sparx5_pool_entry *pool, int size, u32 id);

int sparx5_pool_get(struct sparx5_pool_entry *pool, int size, u32 *id);

int sparx5_pool_get_with_idx(struct sparx5_pool_entry *pool, int size, u32 idx,

			     u32 *id);



/* Clock period in picoseconds */

static inline u32 sparx5_clk_period(enum sparx5_core_clockfreq cclock)

{

drivers/net/ethernet/microchip/sparx5/sparx5_pool.c

0 → 100644
+81 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

/* Microchip Sparx5 Switch driver

 *

 * Copyright (c) 2023 Microchip Technology Inc. and its subsidiaries.

 */



#include "sparx5_main_regs.h"

#include "sparx5_main.h"



static u32 sparx5_pool_id_to_idx(u32 id)

{

	return --id;

}



u32 sparx5_pool_idx_to_id(u32 idx)

{

	return ++idx;

}



/* Release resource from pool.

 * Return reference count on success, otherwise return error.

 */

int sparx5_pool_put(struct sparx5_pool_entry *pool, int size, u32 id)

{

	struct sparx5_pool_entry *e_itr;



	e_itr = (pool + sparx5_pool_id_to_idx(id));

	if (e_itr->ref_cnt == 0)

		return -EINVAL;



	return --e_itr->ref_cnt;

}



/* Get resource from pool.

 * Return reference count on success, otherwise return error.

 */

int sparx5_pool_get(struct sparx5_pool_entry *pool, int size, u32 *id)

{

	struct sparx5_pool_entry *e_itr;

	int i;



	for (i = 0, e_itr = pool; i < size; i++, e_itr++) {

		if (e_itr->ref_cnt == 0) {

			*id = sparx5_pool_idx_to_id(i);

			return ++e_itr->ref_cnt;

		}

	}



	return -ENOSPC;

}



/* Get resource from pool that matches index.

 * Return reference count on success, otherwise return error.

 */

int sparx5_pool_get_with_idx(struct sparx5_pool_entry *pool, int size, u32 idx,

			     u32 *id)

{

	struct sparx5_pool_entry *e_itr;

	int i, ret = -ENOSPC;



	for (i = 0, e_itr = pool; i < size; i++, e_itr++) {

		/* Pool index of first free entry */

		if (e_itr->ref_cnt == 0 && ret == -ENOSPC)

			ret = i;

		/* Tc index already in use ? */

		if (e_itr->idx == idx && e_itr->ref_cnt > 0) {

			ret = i;

			break;

		}

	}



	/* Did we find a free entry? */

	if (ret >= 0) {

		*id = sparx5_pool_idx_to_id(ret);

		e_itr = (pool + ret);

		e_itr->idx = idx;

		return ++e_itr->ref_cnt;

	}



	return ret;

}