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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a83045292d
After the earlier commits ("tipc: remove 'links' list from tipc_bearer struct") and ("tipc: introduce new spinlock to protect struct link_req"), there is no longer any need to protect struct link_req or or any link list by use of bearer_lock. Furthermore, we have eliminated the need for using bearer_lock during downcalls (send) from the link to the bearer, since we have ensured that bearers always have a longer life cycle that their associated links, and always contain valid data. So, the only need now for a lock protecting bearers is for guaranteeing consistency of the bearer list itself. For this, it is sufficient, at least for the time being, to continue applying 'net_lock´ in write mode. By removing bearer_lock we also pre-empt introduction of issue b) descibed in the previous commit "tipc: remove 'links' list from tipc_bearer struct": "b) When the outer protection from net_lock is gone, taking bearer_lock and node_lock in opposite order of method 1) and 2) will become an obvious deadlock hazard". Therefore, we now eliminate the bearer_lock spinlock. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
608 lines
16 KiB
C
608 lines
16 KiB
C
/*
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* net/tipc/bearer.c: TIPC bearer code
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*
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* Copyright (c) 1996-2006, 2013, Ericsson AB
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* Copyright (c) 2004-2006, 2010-2013, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "config.h"
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#include "bearer.h"
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#include "discover.h"
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#define MAX_ADDR_STR 60
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static struct tipc_media * const media_info_array[] = {
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ð_media_info,
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#ifdef CONFIG_TIPC_MEDIA_IB
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&ib_media_info,
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#endif
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NULL
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};
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struct tipc_bearer tipc_bearers[MAX_BEARERS];
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static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down);
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/**
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* tipc_media_find - locates specified media object by name
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*/
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struct tipc_media *tipc_media_find(const char *name)
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{
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u32 i;
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for (i = 0; media_info_array[i] != NULL; i++) {
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if (!strcmp(media_info_array[i]->name, name))
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break;
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}
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return media_info_array[i];
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}
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/**
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* media_find_id - locates specified media object by type identifier
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*/
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static struct tipc_media *media_find_id(u8 type)
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{
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u32 i;
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for (i = 0; media_info_array[i] != NULL; i++) {
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if (media_info_array[i]->type_id == type)
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break;
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}
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return media_info_array[i];
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}
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/**
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* tipc_media_addr_printf - record media address in print buffer
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*/
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void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
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{
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char addr_str[MAX_ADDR_STR];
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struct tipc_media *m_ptr;
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int ret;
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m_ptr = media_find_id(a->media_id);
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if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
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ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
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else {
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u32 i;
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ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id);
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for (i = 0; i < sizeof(a->value); i++)
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ret += tipc_snprintf(buf - ret, len + ret,
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"-%02x", a->value[i]);
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}
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}
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/**
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* tipc_media_get_names - record names of registered media in buffer
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*/
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struct sk_buff *tipc_media_get_names(void)
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{
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struct sk_buff *buf;
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int i;
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buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
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if (!buf)
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return NULL;
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for (i = 0; media_info_array[i] != NULL; i++) {
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tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
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media_info_array[i]->name,
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strlen(media_info_array[i]->name) + 1);
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}
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return buf;
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}
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/**
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* bearer_name_validate - validate & (optionally) deconstruct bearer name
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* @name: ptr to bearer name string
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* @name_parts: ptr to area for bearer name components (or NULL if not needed)
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*
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* Returns 1 if bearer name is valid, otherwise 0.
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*/
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static int bearer_name_validate(const char *name,
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struct tipc_bearer_names *name_parts)
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{
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char name_copy[TIPC_MAX_BEARER_NAME];
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char *media_name;
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char *if_name;
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u32 media_len;
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u32 if_len;
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/* copy bearer name & ensure length is OK */
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name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
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/* need above in case non-Posix strncpy() doesn't pad with nulls */
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strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
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if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
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return 0;
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/* ensure all component parts of bearer name are present */
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media_name = name_copy;
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if_name = strchr(media_name, ':');
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if (if_name == NULL)
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return 0;
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*(if_name++) = 0;
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media_len = if_name - media_name;
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if_len = strlen(if_name) + 1;
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/* validate component parts of bearer name */
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if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
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(if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
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return 0;
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/* return bearer name components, if necessary */
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if (name_parts) {
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strcpy(name_parts->media_name, media_name);
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strcpy(name_parts->if_name, if_name);
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}
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return 1;
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}
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/**
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* tipc_bearer_find - locates bearer object with matching bearer name
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*/
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struct tipc_bearer *tipc_bearer_find(const char *name)
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{
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struct tipc_bearer *b_ptr;
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u32 i;
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for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
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if (b_ptr->active && (!strcmp(b_ptr->name, name)))
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return b_ptr;
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}
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return NULL;
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}
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/**
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* tipc_bearer_get_names - record names of bearers in buffer
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*/
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struct sk_buff *tipc_bearer_get_names(void)
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{
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struct sk_buff *buf;
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struct tipc_bearer *b;
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int i, j;
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buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
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if (!buf)
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return NULL;
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read_lock_bh(&tipc_net_lock);
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for (i = 0; media_info_array[i] != NULL; i++) {
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for (j = 0; j < MAX_BEARERS; j++) {
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b = &tipc_bearers[j];
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if (b->active && (b->media == media_info_array[i])) {
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tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
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b->name,
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strlen(b->name) + 1);
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}
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}
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}
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read_unlock_bh(&tipc_net_lock);
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return buf;
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}
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void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest)
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{
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tipc_nmap_add(&b_ptr->nodes, dest);
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tipc_bcbearer_sort();
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tipc_disc_add_dest(b_ptr->link_req);
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}
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void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest)
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{
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tipc_nmap_remove(&b_ptr->nodes, dest);
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tipc_bcbearer_sort();
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tipc_disc_remove_dest(b_ptr->link_req);
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}
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/**
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* tipc_enable_bearer - enable bearer with the given name
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*/
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int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
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{
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struct tipc_bearer *b_ptr;
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struct tipc_media *m_ptr;
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struct tipc_bearer_names b_names;
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char addr_string[16];
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u32 bearer_id;
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u32 with_this_prio;
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u32 i;
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int res = -EINVAL;
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if (!tipc_own_addr) {
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pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
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name);
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return -ENOPROTOOPT;
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}
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if (!bearer_name_validate(name, &b_names)) {
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pr_warn("Bearer <%s> rejected, illegal name\n", name);
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return -EINVAL;
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}
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if (tipc_addr_domain_valid(disc_domain) &&
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(disc_domain != tipc_own_addr)) {
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if (tipc_in_scope(disc_domain, tipc_own_addr)) {
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disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
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res = 0; /* accept any node in own cluster */
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} else if (in_own_cluster_exact(disc_domain))
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res = 0; /* accept specified node in own cluster */
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}
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if (res) {
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pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
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name);
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return -EINVAL;
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}
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if ((priority > TIPC_MAX_LINK_PRI) &&
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(priority != TIPC_MEDIA_LINK_PRI)) {
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pr_warn("Bearer <%s> rejected, illegal priority\n", name);
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return -EINVAL;
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}
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write_lock_bh(&tipc_net_lock);
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m_ptr = tipc_media_find(b_names.media_name);
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if (!m_ptr) {
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pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
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name, b_names.media_name);
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goto exit;
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}
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if (priority == TIPC_MEDIA_LINK_PRI)
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priority = m_ptr->priority;
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restart:
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bearer_id = MAX_BEARERS;
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with_this_prio = 1;
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for (i = MAX_BEARERS; i-- != 0; ) {
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if (!tipc_bearers[i].active) {
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bearer_id = i;
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continue;
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}
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if (!strcmp(name, tipc_bearers[i].name)) {
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pr_warn("Bearer <%s> rejected, already enabled\n",
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name);
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goto exit;
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}
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if ((tipc_bearers[i].priority == priority) &&
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(++with_this_prio > 2)) {
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if (priority-- == 0) {
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pr_warn("Bearer <%s> rejected, duplicate priority\n",
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name);
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goto exit;
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}
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pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
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name, priority + 1, priority);
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goto restart;
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}
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}
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if (bearer_id >= MAX_BEARERS) {
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pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
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name, MAX_BEARERS);
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goto exit;
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}
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b_ptr = &tipc_bearers[bearer_id];
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strcpy(b_ptr->name, name);
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b_ptr->media = m_ptr;
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res = m_ptr->enable_media(b_ptr);
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if (res) {
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pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
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name, -res);
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goto exit;
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}
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b_ptr->identity = bearer_id;
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b_ptr->tolerance = m_ptr->tolerance;
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b_ptr->window = m_ptr->window;
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b_ptr->net_plane = bearer_id + 'A';
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b_ptr->active = 1;
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b_ptr->priority = priority;
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res = tipc_disc_create(b_ptr, &b_ptr->bcast_addr, disc_domain);
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if (res) {
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bearer_disable(b_ptr, false);
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pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
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name);
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goto exit;
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}
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pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
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name,
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tipc_addr_string_fill(addr_string, disc_domain), priority);
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exit:
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write_unlock_bh(&tipc_net_lock);
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return res;
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}
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/**
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* tipc_reset_bearer - Reset all links established over this bearer
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*/
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static int tipc_reset_bearer(struct tipc_bearer *b_ptr)
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{
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read_lock_bh(&tipc_net_lock);
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pr_info("Resetting bearer <%s>\n", b_ptr->name);
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tipc_link_reset_list(b_ptr->identity);
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read_unlock_bh(&tipc_net_lock);
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return 0;
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}
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/**
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* bearer_disable
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*
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* Note: This routine assumes caller holds tipc_net_lock.
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*/
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static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down)
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{
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pr_info("Disabling bearer <%s>\n", b_ptr->name);
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b_ptr->media->disable_media(b_ptr);
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tipc_link_delete_list(b_ptr->identity, shutting_down);
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if (b_ptr->link_req)
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tipc_disc_delete(b_ptr->link_req);
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memset(b_ptr, 0, sizeof(struct tipc_bearer));
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}
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int tipc_disable_bearer(const char *name)
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{
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struct tipc_bearer *b_ptr;
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int res;
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write_lock_bh(&tipc_net_lock);
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b_ptr = tipc_bearer_find(name);
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if (b_ptr == NULL) {
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pr_warn("Attempt to disable unknown bearer <%s>\n", name);
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res = -EINVAL;
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} else {
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bearer_disable(b_ptr, false);
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res = 0;
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}
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write_unlock_bh(&tipc_net_lock);
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return res;
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}
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/* tipc_l2_media_addr_set - initialize Ethernet media address structure
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*
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* Media-dependent "value" field stores MAC address in first 6 bytes
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* and zeroes out the remaining bytes.
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*/
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void tipc_l2_media_addr_set(const struct tipc_bearer *b,
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struct tipc_media_addr *a, char *mac)
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{
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int len = b->media->hwaddr_len;
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if (unlikely(sizeof(a->value) < len)) {
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WARN_ONCE(1, "Media length invalid\n");
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return;
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}
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memcpy(a->value, mac, len);
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memset(a->value + len, 0, sizeof(a->value) - len);
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a->media_id = b->media->type_id;
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a->broadcast = !memcmp(mac, b->bcast_addr.value, len);
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}
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int tipc_enable_l2_media(struct tipc_bearer *b)
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{
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struct net_device *dev;
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char *driver_name = strchr((const char *)b->name, ':') + 1;
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/* Find device with specified name */
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dev = dev_get_by_name(&init_net, driver_name);
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if (!dev)
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return -ENODEV;
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/* Associate TIPC bearer with Ethernet bearer */
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b->media_ptr = dev;
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memset(b->bcast_addr.value, 0, sizeof(b->bcast_addr.value));
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memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
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b->bcast_addr.media_id = b->media->type_id;
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b->bcast_addr.broadcast = 1;
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b->mtu = dev->mtu;
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tipc_l2_media_addr_set(b, &b->addr, (char *)dev->dev_addr);
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rcu_assign_pointer(dev->tipc_ptr, b);
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return 0;
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}
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/* tipc_disable_l2_media - detach TIPC bearer from an Ethernet interface
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*
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* Mark Ethernet bearer as inactive so that incoming buffers are thrown away,
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* then get worker thread to complete bearer cleanup. (Can't do cleanup
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* here because cleanup code needs to sleep and caller holds spinlocks.)
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*/
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void tipc_disable_l2_media(struct tipc_bearer *b)
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{
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struct net_device *dev = (struct net_device *)b->media_ptr;
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RCU_INIT_POINTER(dev->tipc_ptr, NULL);
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dev_put(dev);
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}
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/**
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* tipc_l2_send_msg - send a TIPC packet out over an Ethernet interface
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* @buf: the packet to be sent
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* @b_ptr: the bearer through which the packet is to be sent
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* @dest: peer destination address
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*/
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int tipc_l2_send_msg(struct sk_buff *buf, struct tipc_bearer *b,
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struct tipc_media_addr *dest)
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{
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struct sk_buff *clone;
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int delta;
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struct net_device *dev = (struct net_device *)b->media_ptr;
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clone = skb_clone(buf, GFP_ATOMIC);
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if (!clone)
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return 0;
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delta = dev->hard_header_len - skb_headroom(buf);
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if ((delta > 0) &&
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pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
|
|
kfree_skb(clone);
|
|
return 0;
|
|
}
|
|
|
|
skb_reset_network_header(clone);
|
|
clone->dev = dev;
|
|
clone->protocol = htons(ETH_P_TIPC);
|
|
dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
|
|
dev->dev_addr, clone->len);
|
|
dev_queue_xmit(clone);
|
|
return 0;
|
|
}
|
|
|
|
/* tipc_bearer_send- sends buffer to destination over bearer
|
|
*
|
|
* IMPORTANT:
|
|
* The media send routine must not alter the buffer being passed in
|
|
* as it may be needed for later retransmission!
|
|
*/
|
|
void tipc_bearer_send(struct tipc_bearer *b, struct sk_buff *buf,
|
|
struct tipc_media_addr *dest)
|
|
{
|
|
b->media->send_msg(buf, b, dest);
|
|
}
|
|
|
|
/**
|
|
* tipc_l2_rcv_msg - handle incoming TIPC message from an interface
|
|
* @buf: the received packet
|
|
* @dev: the net device that the packet was received on
|
|
* @pt: the packet_type structure which was used to register this handler
|
|
* @orig_dev: the original receive net device in case the device is a bond
|
|
*
|
|
* Accept only packets explicitly sent to this node, or broadcast packets;
|
|
* ignores packets sent using interface multicast, and traffic sent to other
|
|
* nodes (which can happen if interface is running in promiscuous mode).
|
|
*/
|
|
static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct tipc_bearer *b_ptr;
|
|
|
|
if (!net_eq(dev_net(dev), &init_net)) {
|
|
kfree_skb(buf);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
b_ptr = rcu_dereference(dev->tipc_ptr);
|
|
if (likely(b_ptr)) {
|
|
if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
|
|
buf->next = NULL;
|
|
tipc_rcv(buf, b_ptr);
|
|
rcu_read_unlock();
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
kfree_skb(buf);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
/**
|
|
* tipc_l2_device_event - handle device events from network device
|
|
* @nb: the context of the notification
|
|
* @evt: the type of event
|
|
* @ptr: the net device that the event was on
|
|
*
|
|
* This function is called by the Ethernet driver in case of link
|
|
* change event.
|
|
*/
|
|
static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
|
|
void *ptr)
|
|
{
|
|
struct tipc_bearer *b_ptr;
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
|
|
if (!net_eq(dev_net(dev), &init_net))
|
|
return NOTIFY_DONE;
|
|
|
|
rcu_read_lock();
|
|
b_ptr = rcu_dereference(dev->tipc_ptr);
|
|
if (!b_ptr) {
|
|
rcu_read_unlock();
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
b_ptr->mtu = dev->mtu;
|
|
|
|
switch (evt) {
|
|
case NETDEV_CHANGE:
|
|
if (netif_carrier_ok(dev))
|
|
break;
|
|
case NETDEV_DOWN:
|
|
case NETDEV_CHANGEMTU:
|
|
case NETDEV_CHANGEADDR:
|
|
tipc_reset_bearer(b_ptr);
|
|
break;
|
|
case NETDEV_UNREGISTER:
|
|
case NETDEV_CHANGENAME:
|
|
tipc_disable_bearer(b_ptr->name);
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct packet_type tipc_packet_type __read_mostly = {
|
|
.type = __constant_htons(ETH_P_TIPC),
|
|
.func = tipc_l2_rcv_msg,
|
|
};
|
|
|
|
static struct notifier_block notifier = {
|
|
.notifier_call = tipc_l2_device_event,
|
|
.priority = 0,
|
|
};
|
|
|
|
int tipc_bearer_setup(void)
|
|
{
|
|
dev_add_pack(&tipc_packet_type);
|
|
return register_netdevice_notifier(¬ifier);
|
|
}
|
|
|
|
void tipc_bearer_cleanup(void)
|
|
{
|
|
unregister_netdevice_notifier(¬ifier);
|
|
dev_remove_pack(&tipc_packet_type);
|
|
}
|
|
|
|
void tipc_bearer_stop(void)
|
|
{
|
|
u32 i;
|
|
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
if (tipc_bearers[i].active)
|
|
bearer_disable(&tipc_bearers[i], true);
|
|
}
|
|
}
|