334 lines
8.4 KiB
C
334 lines
8.4 KiB
C
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/*
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* This file is part of the Chelsio T4 Ethernet driver for Linux.
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* Copyright (C) 2003-2014 Chelsio Communications. All rights reserved.
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*
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* Written by Deepak (deepak.s@chelsio.com)
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
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* release for licensing terms and conditions.
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*/
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/jhash.h>
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#include <linux/if_vlan.h>
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#include <net/addrconf.h>
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#include "cxgb4.h"
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#include "clip_tbl.h"
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static inline unsigned int ipv4_clip_hash(struct clip_tbl *c, const u32 *key)
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{
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unsigned int clipt_size_half = c->clipt_size / 2;
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return jhash_1word(*key, 0) % clipt_size_half;
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}
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static inline unsigned int ipv6_clip_hash(struct clip_tbl *d, const u32 *key)
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{
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unsigned int clipt_size_half = d->clipt_size / 2;
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u32 xor = key[0] ^ key[1] ^ key[2] ^ key[3];
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return clipt_size_half +
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(jhash_1word(xor, 0) % clipt_size_half);
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}
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static unsigned int clip_addr_hash(struct clip_tbl *ctbl, const u32 *addr,
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u8 v6)
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{
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return v6 ? ipv6_clip_hash(ctbl, addr) :
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ipv4_clip_hash(ctbl, addr);
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}
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static int clip6_get_mbox(const struct net_device *dev,
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const struct in6_addr *lip)
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{
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struct adapter *adap = netdev2adap(dev);
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struct fw_clip_cmd c;
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memset(&c, 0, sizeof(c));
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c.op_to_write = htonl(FW_CMD_OP_V(FW_CLIP_CMD) |
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FW_CMD_REQUEST_F | FW_CMD_WRITE_F);
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c.alloc_to_len16 = htonl(FW_CLIP_CMD_ALLOC_F | FW_LEN16(c));
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*(__be64 *)&c.ip_hi = *(__be64 *)(lip->s6_addr);
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*(__be64 *)&c.ip_lo = *(__be64 *)(lip->s6_addr + 8);
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return t4_wr_mbox_meat(adap, adap->mbox, &c, sizeof(c), &c, false);
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}
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static int clip6_release_mbox(const struct net_device *dev,
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const struct in6_addr *lip)
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{
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struct adapter *adap = netdev2adap(dev);
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struct fw_clip_cmd c;
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memset(&c, 0, sizeof(c));
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c.op_to_write = htonl(FW_CMD_OP_V(FW_CLIP_CMD) |
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FW_CMD_REQUEST_F | FW_CMD_READ_F);
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c.alloc_to_len16 = htonl(FW_CLIP_CMD_FREE_F | FW_LEN16(c));
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*(__be64 *)&c.ip_hi = *(__be64 *)(lip->s6_addr);
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*(__be64 *)&c.ip_lo = *(__be64 *)(lip->s6_addr + 8);
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return t4_wr_mbox_meat(adap, adap->mbox, &c, sizeof(c), &c, false);
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}
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int cxgb4_clip_get(const struct net_device *dev, const u32 *lip, u8 v6)
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{
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struct adapter *adap = netdev2adap(dev);
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struct clip_tbl *ctbl = adap->clipt;
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struct clip_entry *ce, *cte;
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u32 *addr = (u32 *)lip;
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int hash;
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int ret = -1;
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if (!ctbl)
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return 0;
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hash = clip_addr_hash(ctbl, addr, v6);
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read_lock_bh(&ctbl->lock);
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list_for_each_entry(cte, &ctbl->hash_list[hash], list) {
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if (cte->addr6.sin6_family == AF_INET6 && v6)
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ret = memcmp(lip, cte->addr6.sin6_addr.s6_addr,
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sizeof(struct in6_addr));
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else if (cte->addr.sin_family == AF_INET && !v6)
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ret = memcmp(lip, (char *)(&cte->addr.sin_addr),
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sizeof(struct in_addr));
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if (!ret) {
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ce = cte;
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read_unlock_bh(&ctbl->lock);
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goto found;
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}
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}
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read_unlock_bh(&ctbl->lock);
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write_lock_bh(&ctbl->lock);
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if (!list_empty(&ctbl->ce_free_head)) {
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ce = list_first_entry(&ctbl->ce_free_head,
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struct clip_entry, list);
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list_del(&ce->list);
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INIT_LIST_HEAD(&ce->list);
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spin_lock_init(&ce->lock);
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atomic_set(&ce->refcnt, 0);
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atomic_dec(&ctbl->nfree);
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list_add_tail(&ce->list, &ctbl->hash_list[hash]);
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if (v6) {
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ce->addr6.sin6_family = AF_INET6;
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memcpy(ce->addr6.sin6_addr.s6_addr,
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lip, sizeof(struct in6_addr));
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ret = clip6_get_mbox(dev, (const struct in6_addr *)lip);
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if (ret) {
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write_unlock_bh(&ctbl->lock);
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dev_err(adap->pdev_dev,
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"CLIP FW cmd failed with error %d, "
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"Connections using %pI6c wont be "
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"offloaded",
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ret, ce->addr6.sin6_addr.s6_addr);
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return ret;
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}
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} else {
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ce->addr.sin_family = AF_INET;
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memcpy((char *)(&ce->addr.sin_addr), lip,
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sizeof(struct in_addr));
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}
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} else {
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write_unlock_bh(&ctbl->lock);
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dev_info(adap->pdev_dev, "CLIP table overflow, "
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"Connections using %pI6c wont be offloaded",
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(void *)lip);
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return -ENOMEM;
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}
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write_unlock_bh(&ctbl->lock);
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found:
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atomic_inc(&ce->refcnt);
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return 0;
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}
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EXPORT_SYMBOL(cxgb4_clip_get);
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void cxgb4_clip_release(const struct net_device *dev, const u32 *lip, u8 v6)
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{
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struct adapter *adap = netdev2adap(dev);
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struct clip_tbl *ctbl = adap->clipt;
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struct clip_entry *ce, *cte;
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u32 *addr = (u32 *)lip;
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int hash;
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int ret = -1;
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if (!ctbl)
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return;
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hash = clip_addr_hash(ctbl, addr, v6);
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read_lock_bh(&ctbl->lock);
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list_for_each_entry(cte, &ctbl->hash_list[hash], list) {
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if (cte->addr6.sin6_family == AF_INET6 && v6)
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ret = memcmp(lip, cte->addr6.sin6_addr.s6_addr,
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sizeof(struct in6_addr));
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else if (cte->addr.sin_family == AF_INET && !v6)
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ret = memcmp(lip, (char *)(&cte->addr.sin_addr),
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sizeof(struct in_addr));
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if (!ret) {
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ce = cte;
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read_unlock_bh(&ctbl->lock);
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goto found;
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}
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}
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read_unlock_bh(&ctbl->lock);
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return;
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found:
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write_lock_bh(&ctbl->lock);
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spin_lock_bh(&ce->lock);
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if (atomic_dec_and_test(&ce->refcnt)) {
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list_del(&ce->list);
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INIT_LIST_HEAD(&ce->list);
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list_add_tail(&ce->list, &ctbl->ce_free_head);
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atomic_inc(&ctbl->nfree);
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if (v6)
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clip6_release_mbox(dev, (const struct in6_addr *)lip);
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}
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spin_unlock_bh(&ce->lock);
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write_unlock_bh(&ctbl->lock);
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}
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EXPORT_SYMBOL(cxgb4_clip_release);
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/* Retrieves IPv6 addresses from a root device (bond, vlan) associated with
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* a physical device.
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* The physical device reference is needed to send the actul CLIP command.
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*/
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static int cxgb4_update_dev_clip(struct net_device *root_dev,
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struct net_device *dev)
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{
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struct inet6_dev *idev = NULL;
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struct inet6_ifaddr *ifa;
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int ret = 0;
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idev = __in6_dev_get(root_dev);
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if (!idev)
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return ret;
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read_lock_bh(&idev->lock);
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list_for_each_entry(ifa, &idev->addr_list, if_list) {
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ret = cxgb4_clip_get(dev, (const u32 *)ifa->addr.s6_addr, 1);
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if (ret < 0)
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break;
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}
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read_unlock_bh(&idev->lock);
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return ret;
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}
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int cxgb4_update_root_dev_clip(struct net_device *dev)
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{
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struct net_device *root_dev = NULL;
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int i, ret = 0;
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/* First populate the real net device's IPv6 addresses */
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ret = cxgb4_update_dev_clip(dev, dev);
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if (ret)
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return ret;
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/* Parse all bond and vlan devices layered on top of the physical dev */
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root_dev = netdev_master_upper_dev_get_rcu(dev);
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if (root_dev) {
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ret = cxgb4_update_dev_clip(root_dev, dev);
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if (ret)
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return ret;
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}
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for (i = 0; i < VLAN_N_VID; i++) {
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root_dev = __vlan_find_dev_deep_rcu(dev, htons(ETH_P_8021Q), i);
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if (!root_dev)
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continue;
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ret = cxgb4_update_dev_clip(root_dev, dev);
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if (ret)
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break;
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}
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return ret;
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}
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EXPORT_SYMBOL(cxgb4_update_root_dev_clip);
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int clip_tbl_show(struct seq_file *seq, void *v)
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{
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struct adapter *adapter = seq->private;
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struct clip_tbl *ctbl = adapter->clipt;
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struct clip_entry *ce;
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char ip[60];
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int i;
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read_lock_bh(&ctbl->lock);
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seq_puts(seq, "IP Address Users\n");
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for (i = 0 ; i < ctbl->clipt_size; ++i) {
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list_for_each_entry(ce, &ctbl->hash_list[i], list) {
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ip[0] = '\0';
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sprintf(ip, "%pISc", &ce->addr);
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seq_printf(seq, "%-25s %u\n", ip,
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atomic_read(&ce->refcnt));
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}
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}
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seq_printf(seq, "Free clip entries : %d\n", atomic_read(&ctbl->nfree));
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read_unlock_bh(&ctbl->lock);
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return 0;
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}
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struct clip_tbl *t4_init_clip_tbl(unsigned int clipt_start,
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unsigned int clipt_end)
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{
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struct clip_entry *cl_list;
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struct clip_tbl *ctbl;
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unsigned int clipt_size;
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int i;
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if (clipt_start >= clipt_end)
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return NULL;
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clipt_size = clipt_end - clipt_start + 1;
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if (clipt_size < CLIPT_MIN_HASH_BUCKETS)
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return NULL;
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ctbl = t4_alloc_mem(sizeof(*ctbl) +
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clipt_size*sizeof(struct list_head));
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if (!ctbl)
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return NULL;
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ctbl->clipt_start = clipt_start;
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ctbl->clipt_size = clipt_size;
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INIT_LIST_HEAD(&ctbl->ce_free_head);
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atomic_set(&ctbl->nfree, clipt_size);
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rwlock_init(&ctbl->lock);
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for (i = 0; i < ctbl->clipt_size; ++i)
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INIT_LIST_HEAD(&ctbl->hash_list[i]);
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cl_list = t4_alloc_mem(clipt_size*sizeof(struct clip_entry));
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if (!cl_list) {
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t4_free_mem(ctbl);
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return NULL;
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}
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ctbl->cl_list = (void *)cl_list;
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for (i = 0; i < clipt_size; i++) {
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INIT_LIST_HEAD(&cl_list[i].list);
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list_add_tail(&cl_list[i].list, &ctbl->ce_free_head);
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}
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return ctbl;
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}
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void t4_cleanup_clip_tbl(struct adapter *adap)
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{
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struct clip_tbl *ctbl = adap->clipt;
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if (ctbl) {
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if (ctbl->cl_list)
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t4_free_mem(ctbl->cl_list);
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t4_free_mem(ctbl);
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}
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}
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EXPORT_SYMBOL(t4_cleanup_clip_tbl);
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