drivers/net/ethernet/chelsio/cxgb4/smt.c - third_party/linux - Git at Google

 /*
  * This file is part of the Chelsio T4/T5/T6 Ethernet driver for Linux.
  *
  * Copyright (c) 2017 Chelsio Communications, Inc. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
  * General Public License (GPL) Version 2, available from the file
  * COPYING in the main directory of this source tree, or the
  * OpenIB.org BSD license below:
  *
  *     Redistribution and use in source and binary forms, with or
  *     without modification, are permitted provided that the following
  *     conditions are met:
  *
  *      - Redistributions of source code must retain the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer.
  *
  *      - Redistributions in binary form must reproduce the above
  *        copyright notice, this list of conditions and the following
  *        disclaimer in the documentation and/or other materials
  *        provided with the distribution.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */

 #include "cxgb4.h"
 #include "smt.h"
 #include "t4_msg.h"
 #include "t4fw_api.h"
 #include "t4_regs.h"
 #include "t4_values.h"

 struct smt_data *t4_init_smt(void)
 {
 	unsigned int smt_size;
 	struct smt_data *s;
 	int i;

 	smt_size = SMT_SIZE;

 	s = kvzalloc(struct_size(s, smtab, smt_size), GFP_KERNEL);
 	if (!s)
 		return NULL;
 	s->smt_size = smt_size;
 	rwlock_init(&s->lock);
 	for (i = 0; i < s->smt_size; ++i) {
 		s->smtab[i].idx = i;
 		s->smtab[i].state = SMT_STATE_UNUSED;
 		memset(&s->smtab[i].src_mac, 0, ETH_ALEN);
 		spin_lock_init(&s->smtab[i].lock);
 		s->smtab[i].refcnt = 0;
 	}
 	return s;
 }

 static struct smt_entry *find_or_alloc_smte(struct smt_data *s, u8 *smac)
 {
 	struct smt_entry *first_free = NULL;
 	struct smt_entry *e, *end;

 	for (e = &s->smtab[0], end = &s->smtab[s->smt_size]; e != end; ++e) {
 		if (e->refcnt == 0) {
 			if (!first_free)
 				first_free = e;
 		} else {
 			if (e->state == SMT_STATE_SWITCHING) {
 				/* This entry is actually in use. See if we can
 				 * re-use it ?
 				 */
 				if (memcmp(e->src_mac, smac, ETH_ALEN) == 0)
 					goto found_reuse;
 			}
 		}
 	}

 	if (first_free) {
 		e = first_free;
 		goto found;
 	}
 	return NULL;

 found:
 	e->state = SMT_STATE_UNUSED;

 found_reuse:
 	return e;
 }

 static void t4_smte_free(struct smt_entry *e)
 {
 	if (e->refcnt == 0) {  /* hasn't been recycled */
 		e->state = SMT_STATE_UNUSED;
 	}
 }

 /**
  * @e: smt entry to release
  *
  * Releases ref count and frees up an smt entry from SMT table
  */
 void cxgb4_smt_release(struct smt_entry *e)
 {
 	spin_lock_bh(&e->lock);
 	if ((--e->refcnt) == 0)
 		t4_smte_free(e);
 	spin_unlock_bh(&e->lock);
 }
 EXPORT_SYMBOL(cxgb4_smt_release);

 void do_smt_write_rpl(struct adapter *adap, const struct cpl_smt_write_rpl *rpl)
 {
 	unsigned int smtidx = TID_TID_G(GET_TID(rpl));
 	struct smt_data *s = adap->smt;

 	if (unlikely(rpl->status != CPL_ERR_NONE)) {
 		struct smt_entry *e = &s->smtab[smtidx];

 		dev_err(adap->pdev_dev,
 			"Unexpected SMT_WRITE_RPL status %u for entry %u\n",
 			rpl->status, smtidx);
 		spin_lock(&e->lock);
 		e->state = SMT_STATE_ERROR;
 		spin_unlock(&e->lock);
 		return;
 	}
 }

 static int write_smt_entry(struct adapter *adapter, struct smt_entry *e)
 {
 	struct cpl_t6_smt_write_req *t6req;
 	struct smt_data *s = adapter->smt;
 	struct cpl_smt_write_req *req;
 	struct sk_buff *skb;
 	int size;
 	u8 row;

 	if (CHELSIO_CHIP_VERSION(adapter->params.chip) <= CHELSIO_T5) {
 		size = sizeof(*req);
 		skb = alloc_skb(size, GFP_ATOMIC);
 		if (!skb)
 			return -ENOMEM;
 		/* Source MAC Table (SMT) contains 256 SMAC entries
 		 * organized in 128 rows of 2 entries each.
 		 */
 		req = (struct cpl_smt_write_req *)__skb_put(skb, size);
 		INIT_TP_WR(req, 0);

 		/* Each row contains an SMAC pair.
 		 * LSB selects the SMAC entry within a row
 		 */
 		row = (e->idx >> 1);
 		if (e->idx & 1) {
 			req->pfvf1 = 0x0;
 			memcpy(req->src_mac1, e->src_mac, ETH_ALEN);

 			/* fill pfvf0/src_mac0 with entry
 			 * at prev index from smt-tab.
 			 */
 			req->pfvf0 = 0x0;
 			memcpy(req->src_mac0, s->smtab[e->idx - 1].src_mac,
 			       ETH_ALEN);
 		} else {
 			req->pfvf0 = 0x0;
 			memcpy(req->src_mac0, e->src_mac, ETH_ALEN);

 			/* fill pfvf1/src_mac1 with entry
 			 * at next index from smt-tab
 			 */
 			req->pfvf1 = 0x0;
 			memcpy(req->src_mac1, s->smtab[e->idx + 1].src_mac,
 			       ETH_ALEN);
 		}
 	} else {
 		size = sizeof(*t6req);
 		skb = alloc_skb(size, GFP_ATOMIC);
 		if (!skb)
 			return -ENOMEM;
 		/* Source MAC Table (SMT) contains 256 SMAC entries */
 		t6req = (struct cpl_t6_smt_write_req *)__skb_put(skb, size);
 		INIT_TP_WR(t6req, 0);
 		req = (struct cpl_smt_write_req *)t6req;

 		/* fill pfvf0/src_mac0 from smt-tab */
 		req->pfvf0 = 0x0;
 		memcpy(req->src_mac0, s->smtab[e->idx].src_mac, ETH_ALEN);
 		row = e->idx;
 	}

 	OPCODE_TID(req) =
 		htonl(MK_OPCODE_TID(CPL_SMT_WRITE_REQ, e->idx |
 				    TID_QID_V(adapter->sge.fw_evtq.abs_id)));
 	req->params = htonl(SMTW_NORPL_V(0) |
 			    SMTW_IDX_V(row) |
 			    SMTW_OVLAN_IDX_V(0));
 	t4_mgmt_tx(adapter, skb);
 	return 0;
 }

 static struct smt_entry *t4_smt_alloc_switching(struct adapter *adap, u16 pfvf,
 						u8 *smac)
 {
 	struct smt_data *s = adap->smt;
 	struct smt_entry *e;

 	write_lock_bh(&s->lock);
 	e = find_or_alloc_smte(s, smac);
 	if (e) {
 		spin_lock(&e->lock);
 		if (!e->refcnt) {
 			e->refcnt = 1;
 			e->state = SMT_STATE_SWITCHING;
 			e->pfvf = pfvf;
 			memcpy(e->src_mac, smac, ETH_ALEN);
 			write_smt_entry(adap, e);
 		} else {
 			++e->refcnt;
 		}
 		spin_unlock(&e->lock);
 	}
 	write_unlock_bh(&s->lock);
 	return e;
 }

 /**
  * @dev: net_device pointer
  * @smac: MAC address to add to SMT
  * Returns pointer to the SMT entry created
  *
  * Allocates an SMT entry to be used by switching rule of a filter.
  */
 struct smt_entry *cxgb4_smt_alloc_switching(struct net_device *dev, u8 *smac)
 {
 	struct adapter *adap = netdev2adap(dev);

 	return t4_smt_alloc_switching(adap, 0x0, smac);
 }
 EXPORT_SYMBOL(cxgb4_smt_alloc_switching);
	/*
	* This file is part of the Chelsio T4/T5/T6 Ethernet driver for Linux.
	*
	* Copyright (c) 2017 Chelsio Communications, Inc. All rights reserved.
	*
	* This software is available to you under a choice of one of two
	* licenses. You may choose to be licensed under the terms of the GNU
	* General Public License (GPL) Version 2, available from the file
	* COPYING in the main directory of this source tree, or the
	* OpenIB.org BSD license below:
	*
	* Redistribution and use in source and binary forms, with or
	* without modification, are permitted provided that the following
	* conditions are met:
	*
	* - Redistributions of source code must retain the above
	* copyright notice, this list of conditions and the following
	* disclaimer.
	*
	* - Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following
	* disclaimer in the documentation and/or other materials
	* provided with the distribution.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	* SOFTWARE.
	*/

	#include "cxgb4.h"
	#include "smt.h"
	#include "t4_msg.h"
	#include "t4fw_api.h"
	#include "t4_regs.h"
	#include "t4_values.h"

	struct smt_data *t4_init_smt(void)
	{
	unsigned int smt_size;
	struct smt_data *s;
	int i;

	smt_size = SMT_SIZE;

	s = kvzalloc(struct_size(s, smtab, smt_size), GFP_KERNEL);
	if (!s)
	return NULL;
	s->smt_size = smt_size;
	rwlock_init(&s->lock);
	for (i = 0; i < s->smt_size; ++i) {
	s->smtab[i].idx = i;
	s->smtab[i].state = SMT_STATE_UNUSED;
	memset(&s->smtab[i].src_mac, 0, ETH_ALEN);
	spin_lock_init(&s->smtab[i].lock);
	s->smtab[i].refcnt = 0;
	}
	return s;
	}

	static struct smt_entry find_or_alloc_smte(struct smt_data s, u8 *smac)
	{
	struct smt_entry *first_free = NULL;
	struct smt_entry e, end;

	for (e = &s->smtab[0], end = &s->smtab[s->smt_size]; e != end; ++e) {
	if (e->refcnt == 0) {
	if (!first_free)
	first_free = e;
	} else {
	if (e->state == SMT_STATE_SWITCHING) {
	/* This entry is actually in use. See if we can
	* re-use it ?
	*/
	if (memcmp(e->src_mac, smac, ETH_ALEN) == 0)
	goto found_reuse;
	}
	}
	}

	if (first_free) {
	e = first_free;
	goto found;
	}
	return NULL;

	found:
	e->state = SMT_STATE_UNUSED;

	found_reuse:
	return e;
	}

	static void t4_smte_free(struct smt_entry *e)
	{
	if (e->refcnt == 0) { /* hasn't been recycled */
	e->state = SMT_STATE_UNUSED;
	}
	}

	/**
	* @e: smt entry to release
	*
	* Releases ref count and frees up an smt entry from SMT table
	*/
	void cxgb4_smt_release(struct smt_entry *e)
	{
	spin_lock_bh(&e->lock);
	if ((--e->refcnt) == 0)
	t4_smte_free(e);
	spin_unlock_bh(&e->lock);
	}
	EXPORT_SYMBOL(cxgb4_smt_release);

	void do_smt_write_rpl(struct adapter adap, const struct cpl_smt_write_rpl rpl)
	{
	unsigned int smtidx = TID_TID_G(GET_TID(rpl));
	struct smt_data *s = adap->smt;

	if (unlikely(rpl->status != CPL_ERR_NONE)) {
	struct smt_entry *e = &s->smtab[smtidx];

	dev_err(adap->pdev_dev,
	"Unexpected SMT_WRITE_RPL status %u for entry %u\n",
	rpl->status, smtidx);
	spin_lock(&e->lock);
	e->state = SMT_STATE_ERROR;
	spin_unlock(&e->lock);
	return;
	}
	}

	static int write_smt_entry(struct adapter adapter, struct smt_entry e)
	{
	struct cpl_t6_smt_write_req *t6req;
	struct smt_data *s = adapter->smt;
	struct cpl_smt_write_req *req;
	struct sk_buff *skb;
	int size;
	u8 row;

	if (CHELSIO_CHIP_VERSION(adapter->params.chip) <= CHELSIO_T5) {
	size = sizeof(*req);
	skb = alloc_skb(size, GFP_ATOMIC);
	if (!skb)
	return -ENOMEM;
	/* Source MAC Table (SMT) contains 256 SMAC entries
	* organized in 128 rows of 2 entries each.
	*/
	req = (struct cpl_smt_write_req *)__skb_put(skb, size);
	INIT_TP_WR(req, 0);

	/* Each row contains an SMAC pair.
	* LSB selects the SMAC entry within a row
	*/
	row = (e->idx >> 1);
	if (e->idx & 1) {
	req->pfvf1 = 0x0;
	memcpy(req->src_mac1, e->src_mac, ETH_ALEN);

	/* fill pfvf0/src_mac0 with entry
	* at prev index from smt-tab.
	*/
	req->pfvf0 = 0x0;
	memcpy(req->src_mac0, s->smtab[e->idx - 1].src_mac,
	ETH_ALEN);
	} else {
	req->pfvf0 = 0x0;
	memcpy(req->src_mac0, e->src_mac, ETH_ALEN);

	/* fill pfvf1/src_mac1 with entry
	* at next index from smt-tab
	*/
	req->pfvf1 = 0x0;
	memcpy(req->src_mac1, s->smtab[e->idx + 1].src_mac,
	ETH_ALEN);
	}
	} else {
	size = sizeof(*t6req);
	skb = alloc_skb(size, GFP_ATOMIC);
	if (!skb)
	return -ENOMEM;
	/* Source MAC Table (SMT) contains 256 SMAC entries */
	t6req = (struct cpl_t6_smt_write_req *)__skb_put(skb, size);
	INIT_TP_WR(t6req, 0);
	req = (struct cpl_smt_write_req *)t6req;

	/* fill pfvf0/src_mac0 from smt-tab */
	req->pfvf0 = 0x0;
	memcpy(req->src_mac0, s->smtab[e->idx].src_mac, ETH_ALEN);
	row = e->idx;
	}

	OPCODE_TID(req) =
	htonl(MK_OPCODE_TID(CPL_SMT_WRITE_REQ, e->idx \|
	TID_QID_V(adapter->sge.fw_evtq.abs_id)));
	req->params = htonl(SMTW_NORPL_V(0) \|
	SMTW_IDX_V(row) \|
	SMTW_OVLAN_IDX_V(0));
	t4_mgmt_tx(adapter, skb);
	return 0;
	}

	static struct smt_entry t4_smt_alloc_switching(struct adapter adap, u16 pfvf,
	u8 *smac)
	{
	struct smt_data *s = adap->smt;
	struct smt_entry *e;

	write_lock_bh(&s->lock);
	e = find_or_alloc_smte(s, smac);
	if (e) {
	spin_lock(&e->lock);
	if (!e->refcnt) {
	e->refcnt = 1;
	e->state = SMT_STATE_SWITCHING;
	e->pfvf = pfvf;
	memcpy(e->src_mac, smac, ETH_ALEN);
	write_smt_entry(adap, e);
	} else {
	++e->refcnt;
	}
	spin_unlock(&e->lock);
	}
	write_unlock_bh(&s->lock);
	return e;
	}

	/**
	* @dev: net_device pointer
	* @smac: MAC address to add to SMT
	* Returns pointer to the SMT entry created
	*
	* Allocates an SMT entry to be used by switching rule of a filter.
	*/
	struct smt_entry cxgb4_smt_alloc_switching(struct net_device dev, u8 *smac)
	{
	struct adapter *adap = netdev2adap(dev);

	return t4_smt_alloc_switching(adap, 0x0, smac);
	}
	EXPORT_SYMBOL(cxgb4_smt_alloc_switching);