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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: Raju Rangoju <[email protected]> Signed-off-by: David S. Miller <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| // 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); | ||
|
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||
| return ret; | ||
| } | ||
|
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| 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; | ||
| } | ||
|
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||
| void cxgb4_free_mps_ref_entries(struct adapter *adap) | ||
| { | ||
| struct mps_entries_ref *mps_entry, *tmp; | ||
|
|
||
| if (!list_empty(&adap->mps_ref)) | ||
| return; | ||
|
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||
| 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); | ||
| } |