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Commit 28b38705 authored by Raju Rangoju's avatar Raju Rangoju Committed by David S. Miller
Browse files

cxgb4: Re-work the logic for mps refcounting 



Remove existing mps refcounting code which was
added only for encap filters and add necessary
data structures/functions to support mps reference
counting for all the mac filters. Also add wrapper
functions for allocating and freeing encap mac
filters.

Signed-off-by: default avatarRaju Rangoju <rajur@chelsio.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0fec7e72

drivers/net/ethernet/chelsio/cxgb4/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ obj-$(CONFIG_CHELSIO_T4) += cxgb4.o 


cxgb4-objs := cxgb4_main.o l2t.o smt.o t4_hw.o sge.o clip_tbl.o cxgb4_ethtool.o \

	      cxgb4_uld.o srq.o sched.o cxgb4_filter.o cxgb4_tc_u32.o \

	      cxgb4_ptp.o cxgb4_tc_flower.o cxgb4_cudbg.o \

	      cxgb4_ptp.o cxgb4_tc_flower.o cxgb4_cudbg.o cxgb4_mps.o \

	      cudbg_common.o cudbg_lib.o cudbg_zlib.o

cxgb4-$(CONFIG_CHELSIO_T4_DCB) +=  cxgb4_dcb.o

cxgb4-$(CONFIG_CHELSIO_T4_FCOE) +=  cxgb4_fcoe.o

drivers/net/ethernet/chelsio/cxgb4/cxgb4.h

+19 −5
Original line number Diff line number Diff line
@@ -905,10 +905,6 @@ struct mbox_list { 
	struct list_head list;

};



struct mps_encap_entry {

	atomic_t refcnt;

};



#if IS_ENABLED(CONFIG_THERMAL)

struct ch_thermal {

	struct thermal_zone_device *tzdev;
@@ -917,6 +913,14 @@ struct ch_thermal { 
};

#endif



struct mps_entries_ref {

	struct list_head list;

	u8 addr[ETH_ALEN];

	u8 mask[ETH_ALEN];

	u16 idx;

	refcount_t refcnt;

};



struct adapter {

	void __iomem *regs;

	void __iomem *bar2;
@@ -969,7 +973,6 @@ struct adapter { 
	unsigned int rawf_start;

	unsigned int rawf_cnt;

	struct smt_data *smt;

	struct mps_encap_entry *mps_encap;

	struct cxgb4_uld_info *uld;

	void *uld_handle[CXGB4_ULD_MAX];

	unsigned int num_uld;
@@ -977,6 +980,8 @@ struct adapter { 
	struct list_head list_node;

	struct list_head rcu_node;

	struct list_head mac_hlist; /* list of MAC addresses in MPS Hash */

	struct list_head mps_ref;

	spinlock_t mps_ref_lock; /* lock for syncing mps ref/def activities */



	void *iscsi_ppm;
@@ -1906,4 +1911,13 @@ int cxgb4_set_msix_aff(struct adapter *adap, unsigned short vec, 
		       cpumask_var_t *aff_mask, int idx);

void cxgb4_clear_msix_aff(unsigned short vec, cpumask_var_t aff_mask);



int cxgb4_init_mps_ref_entries(struct adapter *adap);

void cxgb4_free_mps_ref_entries(struct adapter *adap);

int cxgb4_alloc_encap_mac_filt(struct adapter *adap, unsigned int viid,

			       const u8 *addr, const u8 *mask,

			       unsigned int vni, unsigned int vni_mask,

			       u8 dip_hit, u8 lookup_type, bool sleep_ok);

int cxgb4_free_encap_mac_filt(struct adapter *adap, unsigned int viid,

			      int idx, bool sleep_ok);



#endif /* __CXGB4_H__ */

drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c

+2 −6
Original line number Diff line number Diff line
@@ -727,8 +727,6 @@ void clear_filter(struct adapter *adap, struct filter_entry *f) 
		cxgb4_smt_release(f->smt);



	if (f->fs.val.encap_vld && f->fs.val.ovlan_vld)

		if (atomic_dec_and_test(&adap->mps_encap[f->fs.val.ovlan &

							 0x1ff].refcnt))

		t4_free_encap_mac_filt(adap, pi->viid,

				       f->fs.val.ovlan & 0x1ff, 0);
@@ -1177,7 +1175,6 @@ static int cxgb4_set_hash_filter(struct net_device *dev, 
			if (ret < 0)

				goto free_atid;



			atomic_inc(&adapter->mps_encap[ret].refcnt);

			f->fs.val.ovlan = ret;

			f->fs.mask.ovlan = 0xffff;

			f->fs.val.ovlan_vld = 1;
@@ -1420,7 +1417,6 @@ int __cxgb4_set_filter(struct net_device *dev, int filter_id, 
			if (ret < 0)

				goto free_clip;



			atomic_inc(&adapter->mps_encap[ret].refcnt);

			f->fs.val.ovlan = ret;

			f->fs.mask.ovlan = 0x1ff;

			f->fs.val.ovlan_vld = 1;

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

+4 −10
Original line number Diff line number Diff line
@@ -3273,8 +3273,6 @@ static void cxgb_del_udp_tunnel(struct net_device *netdev, 
				    i);

			return;

		}

		atomic_dec(&adapter->mps_encap[adapter->rawf_start +

			   pi->port_id].refcnt);

	}

}
@@ -3363,7 +3361,6 @@ static void cxgb_add_udp_tunnel(struct net_device *netdev, 
			cxgb_del_udp_tunnel(netdev, ti);

			return;

		}

		atomic_inc(&adapter->mps_encap[ret].refcnt);

	}

}
@@ -5446,7 +5443,6 @@ static void free_some_resources(struct adapter *adapter) 
{

	unsigned int i;



	kvfree(adapter->mps_encap);

	kvfree(adapter->smt);

	kvfree(adapter->l2t);

	kvfree(adapter->srq);
@@ -5972,12 +5968,6 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent) 
		adapter->params.offload = 0;

	}



	adapter->mps_encap = kvcalloc(adapter->params.arch.mps_tcam_size,

				      sizeof(struct mps_encap_entry),

				      GFP_KERNEL);

	if (!adapter->mps_encap)

		dev_warn(&pdev->dev, "could not allocate MPS Encap entries, continuing\n");



#if IS_ENABLED(CONFIG_IPV6)

	if (chip_ver <= CHELSIO_T5 &&

	    (!(t4_read_reg(adapter, LE_DB_CONFIG_A) & ASLIPCOMPEN_F))) {
@@ -6053,6 +6043,8 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent) 
	/* check for PCI Express bandwidth capabiltites */

	pcie_print_link_status(pdev);



	cxgb4_init_mps_ref_entries(adapter);



	err = init_rss(adapter);

	if (err)

		goto out_free_dev;
@@ -6179,6 +6171,8 @@ static void remove_one(struct pci_dev *pdev) 


		disable_interrupts(adapter);



		cxgb4_free_mps_ref_entries(adapter);



		for_each_port(adapter, i)

			if (adapter->port[i]->reg_state == NETREG_REGISTERED)

				unregister_netdev(adapter->port[i]);

drivers/net/ethernet/chelsio/cxgb4/cxgb4_mps.c

0 → 100644
+108 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2019 Chelsio Communications, Inc. All rights reserved. */



#include "cxgb4.h"



static int cxgb4_mps_ref_dec(struct adapter *adap, u16 idx)

{

	struct mps_entries_ref *mps_entry, *tmp;

	int ret = -EINVAL;



	spin_lock(&adap->mps_ref_lock);

	list_for_each_entry_safe(mps_entry, tmp, &adap->mps_ref, list) {

		if (mps_entry->idx == idx) {

			if (!refcount_dec_and_test(&mps_entry->refcnt)) {

				spin_unlock(&adap->mps_ref_lock);

				return -EBUSY;

			}

			list_del(&mps_entry->list);

			kfree(mps_entry);

			ret = 0;

			break;

		}

	}

	spin_unlock(&adap->mps_ref_lock);

	return ret;

}



static int cxgb4_mps_ref_inc(struct adapter *adap, const u8 *mac_addr,

			     u16 idx, const u8 *mask)

{

	u8 bitmask[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

	struct mps_entries_ref *mps_entry;

	int ret = 0;



	spin_lock_bh(&adap->mps_ref_lock);

	list_for_each_entry(mps_entry, &adap->mps_ref, list) {

		if (mps_entry->idx == idx) {

			refcount_inc(&mps_entry->refcnt);

			goto unlock;

		}

	}

	mps_entry = kzalloc(sizeof(*mps_entry), GFP_ATOMIC);

	if (!mps_entry) {

		ret = -ENOMEM;

		goto unlock;

	}

	ether_addr_copy(mps_entry->mask, mask ? mask : bitmask);

	ether_addr_copy(mps_entry->addr, mac_addr);

	mps_entry->idx = idx;

	refcount_set(&mps_entry->refcnt, 1);

	list_add_tail(&mps_entry->list, &adap->mps_ref);

unlock:

	spin_unlock_bh(&adap->mps_ref_lock);

	return ret;

}



int cxgb4_free_encap_mac_filt(struct adapter *adap, unsigned int viid,

			      int idx, bool sleep_ok)

{

	int ret = 0;



	if (!cxgb4_mps_ref_dec(adap, idx))

		ret = t4_free_encap_mac_filt(adap, viid, idx, sleep_ok);



	return ret;

}



int cxgb4_alloc_encap_mac_filt(struct adapter *adap, unsigned int viid,

			       const u8 *addr, const u8 *mask,

			       unsigned int vni, unsigned int vni_mask,

			       u8 dip_hit, u8 lookup_type, bool sleep_ok)

{

	int ret;



	ret = t4_alloc_encap_mac_filt(adap, viid, addr, mask, vni, vni_mask,

				      dip_hit, lookup_type, sleep_ok);

	if (ret < 0)

		return ret;



	if (cxgb4_mps_ref_inc(adap, addr, ret, mask)) {

		ret = -ENOMEM;

		t4_free_encap_mac_filt(adap, viid, ret, sleep_ok);

	}

	return ret;

}



int cxgb4_init_mps_ref_entries(struct adapter *adap)

{

	spin_lock_init(&adap->mps_ref_lock);

	INIT_LIST_HEAD(&adap->mps_ref);



	return 0;

}



void cxgb4_free_mps_ref_entries(struct adapter *adap)

{

	struct mps_entries_ref *mps_entry, *tmp;



	if (!list_empty(&adap->mps_ref))

		return;



	spin_lock(&adap->mps_ref_lock);

	list_for_each_entry_safe(mps_entry, tmp, &adap->mps_ref, list) {

		list_del(&mps_entry->list);

		kfree(mps_entry);

	}

	spin_unlock(&adap->mps_ref_lock);

}