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![Gustavo A. R. Silva](/assets/img/avatar_default.png)
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
468 lines
12 KiB
C
468 lines
12 KiB
C
/*
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* Copyright (c) 2016 Citrix Systems Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Softare Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#define XEN_NETIF_DEFINE_TOEPLITZ
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#include "common.h"
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#include <linux/vmalloc.h>
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#include <linux/rculist.h>
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static void xenvif_add_hash(struct xenvif *vif, const u8 *tag,
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unsigned int len, u32 val)
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{
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struct xenvif_hash_cache_entry *new, *entry, *oldest;
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unsigned long flags;
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bool found;
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new = kmalloc(sizeof(*entry), GFP_ATOMIC);
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if (!new)
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return;
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memcpy(new->tag, tag, len);
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new->len = len;
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new->val = val;
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spin_lock_irqsave(&vif->hash.cache.lock, flags);
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found = false;
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oldest = NULL;
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list_for_each_entry_rcu(entry, &vif->hash.cache.list, link,
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lockdep_is_held(&vif->hash.cache.lock)) {
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/* Make sure we don't add duplicate entries */
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if (entry->len == len &&
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memcmp(entry->tag, tag, len) == 0)
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found = true;
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if (!oldest || entry->seq < oldest->seq)
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oldest = entry;
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}
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if (!found) {
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new->seq = atomic_inc_return(&vif->hash.cache.seq);
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list_add_rcu(&new->link, &vif->hash.cache.list);
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if (++vif->hash.cache.count > xenvif_hash_cache_size) {
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list_del_rcu(&oldest->link);
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vif->hash.cache.count--;
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kfree_rcu(oldest, rcu);
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}
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}
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spin_unlock_irqrestore(&vif->hash.cache.lock, flags);
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if (found)
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kfree(new);
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}
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static u32 xenvif_new_hash(struct xenvif *vif, const u8 *data,
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unsigned int len)
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{
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u32 val;
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val = xen_netif_toeplitz_hash(vif->hash.key,
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sizeof(vif->hash.key),
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data, len);
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if (xenvif_hash_cache_size != 0)
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xenvif_add_hash(vif, data, len, val);
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return val;
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}
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static void xenvif_flush_hash(struct xenvif *vif)
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{
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struct xenvif_hash_cache_entry *entry;
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unsigned long flags;
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if (xenvif_hash_cache_size == 0)
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return;
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spin_lock_irqsave(&vif->hash.cache.lock, flags);
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list_for_each_entry_rcu(entry, &vif->hash.cache.list, link,
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lockdep_is_held(&vif->hash.cache.lock)) {
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list_del_rcu(&entry->link);
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vif->hash.cache.count--;
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kfree_rcu(entry, rcu);
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}
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spin_unlock_irqrestore(&vif->hash.cache.lock, flags);
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}
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static u32 xenvif_find_hash(struct xenvif *vif, const u8 *data,
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unsigned int len)
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{
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struct xenvif_hash_cache_entry *entry;
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u32 val;
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bool found;
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if (len >= XEN_NETBK_HASH_TAG_SIZE)
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return 0;
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if (xenvif_hash_cache_size == 0)
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return xenvif_new_hash(vif, data, len);
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rcu_read_lock();
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found = false;
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list_for_each_entry_rcu(entry, &vif->hash.cache.list, link) {
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if (entry->len == len &&
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memcmp(entry->tag, data, len) == 0) {
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val = entry->val;
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entry->seq = atomic_inc_return(&vif->hash.cache.seq);
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found = true;
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break;
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}
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}
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rcu_read_unlock();
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if (!found)
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val = xenvif_new_hash(vif, data, len);
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return val;
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}
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void xenvif_set_skb_hash(struct xenvif *vif, struct sk_buff *skb)
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{
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struct flow_keys flow;
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u32 hash = 0;
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enum pkt_hash_types type = PKT_HASH_TYPE_NONE;
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u32 flags = vif->hash.flags;
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bool has_tcp_hdr;
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/* Quick rejection test: If the network protocol doesn't
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* correspond to any enabled hash type then there's no point
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* in parsing the packet header.
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*/
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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if (flags & (XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP |
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XEN_NETIF_CTRL_HASH_TYPE_IPV4))
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break;
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goto done;
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case htons(ETH_P_IPV6):
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if (flags & (XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP |
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XEN_NETIF_CTRL_HASH_TYPE_IPV6))
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break;
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goto done;
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default:
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goto done;
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}
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memset(&flow, 0, sizeof(flow));
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if (!skb_flow_dissect_flow_keys(skb, &flow, 0))
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goto done;
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has_tcp_hdr = (flow.basic.ip_proto == IPPROTO_TCP) &&
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!(flow.control.flags & FLOW_DIS_IS_FRAGMENT);
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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if (has_tcp_hdr &&
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(flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP)) {
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u8 data[12];
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memcpy(&data[0], &flow.addrs.v4addrs.src, 4);
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memcpy(&data[4], &flow.addrs.v4addrs.dst, 4);
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memcpy(&data[8], &flow.ports.src, 2);
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memcpy(&data[10], &flow.ports.dst, 2);
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hash = xenvif_find_hash(vif, data, sizeof(data));
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type = PKT_HASH_TYPE_L4;
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} else if (flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4) {
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u8 data[8];
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memcpy(&data[0], &flow.addrs.v4addrs.src, 4);
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memcpy(&data[4], &flow.addrs.v4addrs.dst, 4);
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hash = xenvif_find_hash(vif, data, sizeof(data));
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type = PKT_HASH_TYPE_L3;
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}
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break;
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case htons(ETH_P_IPV6):
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if (has_tcp_hdr &&
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(flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP)) {
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u8 data[36];
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memcpy(&data[0], &flow.addrs.v6addrs.src, 16);
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memcpy(&data[16], &flow.addrs.v6addrs.dst, 16);
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memcpy(&data[32], &flow.ports.src, 2);
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memcpy(&data[34], &flow.ports.dst, 2);
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hash = xenvif_find_hash(vif, data, sizeof(data));
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type = PKT_HASH_TYPE_L4;
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} else if (flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6) {
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u8 data[32];
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memcpy(&data[0], &flow.addrs.v6addrs.src, 16);
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memcpy(&data[16], &flow.addrs.v6addrs.dst, 16);
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hash = xenvif_find_hash(vif, data, sizeof(data));
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type = PKT_HASH_TYPE_L3;
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}
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break;
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}
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done:
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if (type == PKT_HASH_TYPE_NONE)
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skb_clear_hash(skb);
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else
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__skb_set_sw_hash(skb, hash, type == PKT_HASH_TYPE_L4);
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}
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u32 xenvif_set_hash_alg(struct xenvif *vif, u32 alg)
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{
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switch (alg) {
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case XEN_NETIF_CTRL_HASH_ALGORITHM_NONE:
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case XEN_NETIF_CTRL_HASH_ALGORITHM_TOEPLITZ:
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break;
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default:
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return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
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}
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vif->hash.alg = alg;
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return XEN_NETIF_CTRL_STATUS_SUCCESS;
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}
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u32 xenvif_get_hash_flags(struct xenvif *vif, u32 *flags)
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{
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if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
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return XEN_NETIF_CTRL_STATUS_NOT_SUPPORTED;
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*flags = XEN_NETIF_CTRL_HASH_TYPE_IPV4 |
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XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP |
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XEN_NETIF_CTRL_HASH_TYPE_IPV6 |
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XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP;
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return XEN_NETIF_CTRL_STATUS_SUCCESS;
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}
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u32 xenvif_set_hash_flags(struct xenvif *vif, u32 flags)
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{
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if (flags & ~(XEN_NETIF_CTRL_HASH_TYPE_IPV4 |
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XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP |
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XEN_NETIF_CTRL_HASH_TYPE_IPV6 |
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XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP))
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return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
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if (vif->hash.alg == XEN_NETIF_CTRL_HASH_ALGORITHM_NONE)
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return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
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vif->hash.flags = flags;
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return XEN_NETIF_CTRL_STATUS_SUCCESS;
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}
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u32 xenvif_set_hash_key(struct xenvif *vif, u32 gref, u32 len)
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{
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u8 *key = vif->hash.key;
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struct gnttab_copy copy_op = {
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.source.u.ref = gref,
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.source.domid = vif->domid,
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.dest.u.gmfn = virt_to_gfn(key),
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.dest.domid = DOMID_SELF,
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.dest.offset = xen_offset_in_page(key),
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.len = len,
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.flags = GNTCOPY_source_gref
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};
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if (len > XEN_NETBK_MAX_HASH_KEY_SIZE)
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return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
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if (copy_op.len != 0) {
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gnttab_batch_copy(©_op, 1);
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if (copy_op.status != GNTST_okay)
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return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
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}
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/* Clear any remaining key octets */
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if (len < XEN_NETBK_MAX_HASH_KEY_SIZE)
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memset(key + len, 0, XEN_NETBK_MAX_HASH_KEY_SIZE - len);
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xenvif_flush_hash(vif);
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return XEN_NETIF_CTRL_STATUS_SUCCESS;
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}
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u32 xenvif_set_hash_mapping_size(struct xenvif *vif, u32 size)
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{
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if (size > XEN_NETBK_MAX_HASH_MAPPING_SIZE)
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return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
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vif->hash.size = size;
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memset(vif->hash.mapping[vif->hash.mapping_sel], 0,
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sizeof(u32) * size);
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return XEN_NETIF_CTRL_STATUS_SUCCESS;
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}
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u32 xenvif_set_hash_mapping(struct xenvif *vif, u32 gref, u32 len,
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u32 off)
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{
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u32 *mapping = vif->hash.mapping[!vif->hash.mapping_sel];
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unsigned int nr = 1;
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struct gnttab_copy copy_op[2] = {{
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.source.u.ref = gref,
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.source.domid = vif->domid,
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.dest.domid = DOMID_SELF,
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.len = len * sizeof(*mapping),
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.flags = GNTCOPY_source_gref
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}};
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if ((off + len < off) || (off + len > vif->hash.size) ||
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len > XEN_PAGE_SIZE / sizeof(*mapping))
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return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
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copy_op[0].dest.u.gmfn = virt_to_gfn(mapping + off);
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copy_op[0].dest.offset = xen_offset_in_page(mapping + off);
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if (copy_op[0].dest.offset + copy_op[0].len > XEN_PAGE_SIZE) {
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copy_op[1] = copy_op[0];
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copy_op[1].source.offset = XEN_PAGE_SIZE - copy_op[0].dest.offset;
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copy_op[1].dest.u.gmfn = virt_to_gfn(mapping + off + len);
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copy_op[1].dest.offset = 0;
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copy_op[1].len = copy_op[0].len - copy_op[1].source.offset;
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copy_op[0].len = copy_op[1].source.offset;
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nr = 2;
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}
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memcpy(mapping, vif->hash.mapping[vif->hash.mapping_sel],
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vif->hash.size * sizeof(*mapping));
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if (copy_op[0].len != 0) {
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gnttab_batch_copy(copy_op, nr);
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if (copy_op[0].status != GNTST_okay ||
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copy_op[nr - 1].status != GNTST_okay)
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return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
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}
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while (len-- != 0)
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if (mapping[off++] >= vif->num_queues)
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return XEN_NETIF_CTRL_STATUS_INVALID_PARAMETER;
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vif->hash.mapping_sel = !vif->hash.mapping_sel;
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return XEN_NETIF_CTRL_STATUS_SUCCESS;
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}
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#ifdef CONFIG_DEBUG_FS
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void xenvif_dump_hash_info(struct xenvif *vif, struct seq_file *m)
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{
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unsigned int i;
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switch (vif->hash.alg) {
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case XEN_NETIF_CTRL_HASH_ALGORITHM_TOEPLITZ:
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seq_puts(m, "Hash Algorithm: TOEPLITZ\n");
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break;
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case XEN_NETIF_CTRL_HASH_ALGORITHM_NONE:
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seq_puts(m, "Hash Algorithm: NONE\n");
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fallthrough;
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default:
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return;
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}
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if (vif->hash.flags) {
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seq_puts(m, "\nHash Flags:\n");
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if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4)
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seq_puts(m, "- IPv4\n");
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if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV4_TCP)
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seq_puts(m, "- IPv4 + TCP\n");
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if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6)
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seq_puts(m, "- IPv6\n");
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if (vif->hash.flags & XEN_NETIF_CTRL_HASH_TYPE_IPV6_TCP)
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seq_puts(m, "- IPv6 + TCP\n");
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}
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seq_puts(m, "\nHash Key:\n");
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for (i = 0; i < XEN_NETBK_MAX_HASH_KEY_SIZE; ) {
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unsigned int j, n;
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n = 8;
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if (i + n >= XEN_NETBK_MAX_HASH_KEY_SIZE)
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n = XEN_NETBK_MAX_HASH_KEY_SIZE - i;
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seq_printf(m, "[%2u - %2u]: ", i, i + n - 1);
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for (j = 0; j < n; j++, i++)
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seq_printf(m, "%02x ", vif->hash.key[i]);
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seq_puts(m, "\n");
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}
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if (vif->hash.size != 0) {
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const u32 *mapping = vif->hash.mapping[vif->hash.mapping_sel];
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seq_puts(m, "\nHash Mapping:\n");
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for (i = 0; i < vif->hash.size; ) {
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unsigned int j, n;
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n = 8;
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if (i + n >= vif->hash.size)
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n = vif->hash.size - i;
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seq_printf(m, "[%4u - %4u]: ", i, i + n - 1);
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for (j = 0; j < n; j++, i++)
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seq_printf(m, "%4u ", mapping[i]);
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seq_puts(m, "\n");
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}
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}
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}
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#endif /* CONFIG_DEBUG_FS */
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void xenvif_init_hash(struct xenvif *vif)
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{
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if (xenvif_hash_cache_size == 0)
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return;
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BUG_ON(vif->hash.cache.count);
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spin_lock_init(&vif->hash.cache.lock);
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INIT_LIST_HEAD(&vif->hash.cache.list);
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}
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void xenvif_deinit_hash(struct xenvif *vif)
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{
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xenvif_flush_hash(vif);
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}
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