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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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ipmi: Add support for IPMB direct messages
An application has come up that has a device sitting right on the IPMB that would like to communicate with the BMC on the IPMB using normal IPMI commands. Sending these commands and handling the responses is easy enough, no modifications are needed to the IPMI infrastructure. But if this is an application that also needs to receive IPMB commands and respond, some way is needed to handle these incoming commands and send the responses. Currently, the IPMI message handler only sends commands to the interface and only receives responses from interface. This change extends the interface to receive commands/responses and send commands/responses. These are formatted differently in support of receiving/sending IPMB messages directly. Signed-off-by: Corey Minyard <minyard@acm.org> Tested-by: Andrew Manley <andrew.manley@sealingtech.com> Reviewed-by: Andrew Manley <andrew.manley@sealingtech.com>
This commit is contained in:
parent
1e4071f628
commit
059747c245
3 changed files with 328 additions and 33 deletions
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@ -653,6 +653,11 @@ static int is_ipmb_bcast_addr(struct ipmi_addr *addr)
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return addr->addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE;
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}
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static int is_ipmb_direct_addr(struct ipmi_addr *addr)
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{
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return addr->addr_type == IPMI_IPMB_DIRECT_ADDR_TYPE;
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}
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static void free_recv_msg_list(struct list_head *q)
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{
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struct ipmi_recv_msg *msg, *msg2;
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@ -805,6 +810,17 @@ ipmi_addr_equal(struct ipmi_addr *addr1, struct ipmi_addr *addr2)
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&& (ipmb_addr1->lun == ipmb_addr2->lun));
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}
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if (is_ipmb_direct_addr(addr1)) {
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struct ipmi_ipmb_direct_addr *daddr1
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= (struct ipmi_ipmb_direct_addr *) addr1;
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struct ipmi_ipmb_direct_addr *daddr2
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= (struct ipmi_ipmb_direct_addr *) addr2;
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return daddr1->slave_addr == daddr2->slave_addr &&
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daddr1->rq_lun == daddr2->rq_lun &&
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daddr1->rs_lun == daddr2->rs_lun;
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}
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if (is_lan_addr(addr1)) {
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struct ipmi_lan_addr *lan_addr1
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= (struct ipmi_lan_addr *) addr1;
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@ -843,6 +859,23 @@ int ipmi_validate_addr(struct ipmi_addr *addr, int len)
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return 0;
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}
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if (is_ipmb_direct_addr(addr)) {
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struct ipmi_ipmb_direct_addr *daddr = (void *) addr;
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if (addr->channel != 0)
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return -EINVAL;
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if (len < sizeof(struct ipmi_ipmb_direct_addr))
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return -EINVAL;
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if (daddr->slave_addr & 0x01)
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return -EINVAL;
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if (daddr->rq_lun >= 4)
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return -EINVAL;
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if (daddr->rs_lun >= 4)
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return -EINVAL;
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return 0;
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}
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if (is_lan_addr(addr)) {
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if (len < sizeof(struct ipmi_lan_addr))
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return -EINVAL;
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@ -862,6 +895,9 @@ unsigned int ipmi_addr_length(int addr_type)
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|| (addr_type == IPMI_IPMB_BROADCAST_ADDR_TYPE))
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return sizeof(struct ipmi_ipmb_addr);
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if (addr_type == IPMI_IPMB_DIRECT_ADDR_TYPE)
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return sizeof(struct ipmi_ipmb_direct_addr);
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if (addr_type == IPMI_LAN_ADDR_TYPE)
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return sizeof(struct ipmi_lan_addr);
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@ -2052,6 +2088,58 @@ static int i_ipmi_req_ipmb(struct ipmi_smi *intf,
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return rv;
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}
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static int i_ipmi_req_ipmb_direct(struct ipmi_smi *intf,
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struct ipmi_addr *addr,
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long msgid,
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struct kernel_ipmi_msg *msg,
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struct ipmi_smi_msg *smi_msg,
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struct ipmi_recv_msg *recv_msg,
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unsigned char source_lun)
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{
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struct ipmi_ipmb_direct_addr *daddr;
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bool is_cmd = !(recv_msg->msg.netfn & 0x1);
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if (!(intf->handlers->flags & IPMI_SMI_CAN_HANDLE_IPMB_DIRECT))
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return -EAFNOSUPPORT;
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/* Responses must have a completion code. */
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if (!is_cmd && msg->data_len < 1) {
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ipmi_inc_stat(intf, sent_invalid_commands);
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return -EINVAL;
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}
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if ((msg->data_len + 4) > IPMI_MAX_MSG_LENGTH) {
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ipmi_inc_stat(intf, sent_invalid_commands);
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return -EMSGSIZE;
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}
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daddr = (struct ipmi_ipmb_direct_addr *) addr;
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if (daddr->rq_lun > 3 || daddr->rs_lun > 3) {
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ipmi_inc_stat(intf, sent_invalid_commands);
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return -EINVAL;
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}
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smi_msg->type = IPMI_SMI_MSG_TYPE_IPMB_DIRECT;
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smi_msg->msgid = msgid;
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if (is_cmd) {
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smi_msg->data[0] = msg->netfn << 2 | daddr->rs_lun;
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smi_msg->data[2] = recv_msg->msgid << 2 | daddr->rq_lun;
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} else {
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smi_msg->data[0] = msg->netfn << 2 | daddr->rq_lun;
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smi_msg->data[2] = recv_msg->msgid << 2 | daddr->rs_lun;
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}
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smi_msg->data[1] = daddr->slave_addr;
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smi_msg->data[3] = msg->cmd;
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memcpy(smi_msg->data + 4, msg->data, msg->data_len);
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smi_msg->data_size = msg->data_len + 4;
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smi_msg->user_data = recv_msg;
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return 0;
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}
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static int i_ipmi_req_lan(struct ipmi_smi *intf,
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struct ipmi_addr *addr,
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long msgid,
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@ -2241,6 +2329,9 @@ static int i_ipmi_request(struct ipmi_user *user,
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rv = i_ipmi_req_ipmb(intf, addr, msgid, msg, smi_msg, recv_msg,
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source_address, source_lun,
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retries, retry_time_ms);
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} else if (is_ipmb_direct_addr(addr)) {
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rv = i_ipmi_req_ipmb_direct(intf, addr, msgid, msg, smi_msg,
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recv_msg, source_lun);
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} else if (is_lan_addr(addr)) {
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rv = i_ipmi_req_lan(intf, addr, msgid, msg, smi_msg, recv_msg,
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source_lun, retries, retry_time_ms);
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@ -3802,6 +3893,123 @@ static int handle_ipmb_get_msg_cmd(struct ipmi_smi *intf,
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return rv;
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}
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static int handle_ipmb_direct_rcv_cmd(struct ipmi_smi *intf,
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struct ipmi_smi_msg *msg)
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{
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struct cmd_rcvr *rcvr;
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int rv = 0;
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struct ipmi_user *user = NULL;
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struct ipmi_ipmb_direct_addr *daddr;
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struct ipmi_recv_msg *recv_msg;
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unsigned char netfn = msg->rsp[0] >> 2;
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unsigned char cmd = msg->rsp[3];
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rcu_read_lock();
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/* We always use channel 0 for direct messages. */
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rcvr = find_cmd_rcvr(intf, netfn, cmd, 0);
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if (rcvr) {
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user = rcvr->user;
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kref_get(&user->refcount);
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} else
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user = NULL;
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rcu_read_unlock();
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if (user == NULL) {
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/* We didn't find a user, deliver an error response. */
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ipmi_inc_stat(intf, unhandled_commands);
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msg->data[0] = ((netfn + 1) << 2) | (msg->rsp[4] & 0x3);
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msg->data[1] = msg->rsp[2];
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msg->data[2] = msg->rsp[4] & ~0x3;
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msg->data[3] = cmd;
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msg->data[4] = IPMI_INVALID_CMD_COMPLETION_CODE;
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msg->data_size = 5;
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rcu_read_lock();
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if (!intf->in_shutdown) {
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smi_send(intf, intf->handlers, msg, 0);
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/*
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* We used the message, so return the value
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* that causes it to not be freed or
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* queued.
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*/
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rv = -1;
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}
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rcu_read_unlock();
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} else {
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recv_msg = ipmi_alloc_recv_msg();
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if (!recv_msg) {
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/*
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* We couldn't allocate memory for the
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* message, so requeue it for handling
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* later.
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*/
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rv = 1;
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kref_put(&user->refcount, free_user);
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} else {
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/* Extract the source address from the data. */
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daddr = (struct ipmi_ipmb_direct_addr *)&recv_msg->addr;
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daddr->addr_type = IPMI_IPMB_DIRECT_ADDR_TYPE;
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daddr->channel = 0;
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daddr->slave_addr = msg->rsp[1];
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daddr->rs_lun = msg->rsp[0] & 3;
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daddr->rq_lun = msg->rsp[2] & 3;
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/*
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* Extract the rest of the message information
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* from the IPMB header.
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*/
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recv_msg->user = user;
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recv_msg->recv_type = IPMI_CMD_RECV_TYPE;
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recv_msg->msgid = (msg->rsp[2] >> 2);
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recv_msg->msg.netfn = msg->rsp[0] >> 2;
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recv_msg->msg.cmd = msg->rsp[3];
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recv_msg->msg.data = recv_msg->msg_data;
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recv_msg->msg.data_len = msg->rsp_size - 4;
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memcpy(recv_msg->msg_data, msg->rsp + 4,
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msg->rsp_size - 4);
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if (deliver_response(intf, recv_msg))
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ipmi_inc_stat(intf, unhandled_commands);
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else
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ipmi_inc_stat(intf, handled_commands);
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}
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}
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return rv;
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}
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static int handle_ipmb_direct_rcv_rsp(struct ipmi_smi *intf,
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struct ipmi_smi_msg *msg)
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{
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struct ipmi_recv_msg *recv_msg;
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struct ipmi_ipmb_direct_addr *daddr;
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recv_msg = (struct ipmi_recv_msg *) msg->user_data;
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if (recv_msg == NULL) {
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dev_warn(intf->si_dev,
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"IPMI message received with no owner. This could be because of a malformed message, or because of a hardware error. Contact your hardware vendor for assistance.\n");
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return 0;
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}
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recv_msg->recv_type = IPMI_RESPONSE_RECV_TYPE;
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recv_msg->msgid = msg->msgid;
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daddr = (struct ipmi_ipmb_direct_addr *) &recv_msg->addr;
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daddr->addr_type = IPMI_IPMB_DIRECT_ADDR_TYPE;
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daddr->channel = 0;
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daddr->slave_addr = msg->rsp[1];
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daddr->rq_lun = msg->rsp[0] & 3;
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daddr->rs_lun = msg->rsp[2] & 3;
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recv_msg->msg.netfn = msg->rsp[0] >> 2;
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recv_msg->msg.cmd = msg->rsp[3];
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memcpy(recv_msg->msg_data, &msg->rsp[4], msg->rsp_size - 4);
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recv_msg->msg.data = recv_msg->msg_data;
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recv_msg->msg.data_len = msg->rsp_size - 4;
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deliver_local_response(intf, recv_msg);
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return 0;
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}
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static int handle_lan_get_msg_rsp(struct ipmi_smi *intf,
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struct ipmi_smi_msg *msg)
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{
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@ -4227,18 +4435,40 @@ static int handle_bmc_rsp(struct ipmi_smi *intf,
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static int handle_one_recv_msg(struct ipmi_smi *intf,
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struct ipmi_smi_msg *msg)
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{
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int requeue;
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int requeue = 0;
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int chan;
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unsigned char cc;
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bool is_cmd = !((msg->rsp[0] >> 2) & 1);
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pr_debug("Recv: %*ph\n", msg->rsp_size, msg->rsp);
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if ((msg->data_size >= 2)
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if (msg->rsp_size < 2) {
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/* Message is too small to be correct. */
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dev_warn(intf->si_dev,
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"BMC returned too small a message for netfn %x cmd %x, got %d bytes\n",
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(msg->data[0] >> 2) | 1, msg->data[1], msg->rsp_size);
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return_unspecified:
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/* Generate an error response for the message. */
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msg->rsp[0] = msg->data[0] | (1 << 2);
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msg->rsp[1] = msg->data[1];
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msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
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msg->rsp_size = 3;
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} else if (msg->type == IPMI_SMI_MSG_TYPE_IPMB_DIRECT) {
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/* commands must have at least 3 bytes, responses 4. */
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if (is_cmd && (msg->rsp_size < 3)) {
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ipmi_inc_stat(intf, invalid_commands);
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goto out;
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}
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if (!is_cmd && (msg->rsp_size < 4))
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goto return_unspecified;
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} else if ((msg->data_size >= 2)
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&& (msg->data[0] == (IPMI_NETFN_APP_REQUEST << 2))
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&& (msg->data[1] == IPMI_SEND_MSG_CMD)
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&& (msg->user_data == NULL)) {
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if (intf->in_shutdown)
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goto free_msg;
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goto out;
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/*
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* This is the local response to a command send, start
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@ -4273,21 +4503,6 @@ static int handle_one_recv_msg(struct ipmi_smi *intf,
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} else
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/* The message was sent, start the timer. */
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intf_start_seq_timer(intf, msg->msgid);
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free_msg:
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requeue = 0;
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goto out;
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} else if (msg->rsp_size < 2) {
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/* Message is too small to be correct. */
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dev_warn(intf->si_dev,
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"BMC returned too small a message for netfn %x cmd %x, got %d bytes\n",
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(msg->data[0] >> 2) | 1, msg->data[1], msg->rsp_size);
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/* Generate an error response for the message. */
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msg->rsp[0] = msg->data[0] | (1 << 2);
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msg->rsp[1] = msg->data[1];
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msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
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msg->rsp_size = 3;
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} else if (((msg->rsp[0] >> 2) != ((msg->data[0] >> 2) | 1))
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|| (msg->rsp[1] != msg->data[1])) {
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/*
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@ -4299,39 +4514,46 @@ static int handle_one_recv_msg(struct ipmi_smi *intf,
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(msg->data[0] >> 2) | 1, msg->data[1],
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msg->rsp[0] >> 2, msg->rsp[1]);
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/* Generate an error response for the message. */
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msg->rsp[0] = msg->data[0] | (1 << 2);
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msg->rsp[1] = msg->data[1];
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msg->rsp[2] = IPMI_ERR_UNSPECIFIED;
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msg->rsp_size = 3;
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goto return_unspecified;
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}
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if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
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&& (msg->rsp[1] == IPMI_SEND_MSG_CMD)
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&& (msg->user_data != NULL)) {
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if (msg->type == IPMI_SMI_MSG_TYPE_IPMB_DIRECT) {
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if ((msg->data[0] >> 2) & 1) {
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/* It's a response to a sent response. */
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chan = 0;
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cc = msg->rsp[4];
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goto process_response_response;
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}
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if (is_cmd)
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requeue = handle_ipmb_direct_rcv_cmd(intf, msg);
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else
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requeue = handle_ipmb_direct_rcv_rsp(intf, msg);
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} else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
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&& (msg->rsp[1] == IPMI_SEND_MSG_CMD)
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&& (msg->user_data != NULL)) {
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/*
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* It's a response to a response we sent. For this we
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* deliver a send message response to the user.
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*/
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struct ipmi_recv_msg *recv_msg = msg->user_data;
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requeue = 0;
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if (msg->rsp_size < 2)
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/* Message is too small to be correct. */
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goto out;
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struct ipmi_recv_msg *recv_msg;
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chan = msg->data[2] & 0x0f;
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if (chan >= IPMI_MAX_CHANNELS)
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/* Invalid channel number */
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goto out;
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cc = msg->rsp[2];
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process_response_response:
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recv_msg = msg->user_data;
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requeue = 0;
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if (!recv_msg)
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goto out;
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recv_msg->recv_type = IPMI_RESPONSE_RESPONSE_TYPE;
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recv_msg->msg.data = recv_msg->msg_data;
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recv_msg->msg_data[0] = cc;
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recv_msg->msg.data_len = 1;
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recv_msg->msg_data[0] = msg->rsp[2];
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deliver_local_response(intf, recv_msg);
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} else if ((msg->rsp[0] == ((IPMI_NETFN_APP_REQUEST|1) << 2))
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&& (msg->rsp[1] == IPMI_GET_MSG_CMD)) {
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@ -38,6 +38,59 @@ struct ipmi_smi;
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#define IPMI_WATCH_MASK_CHECK_WATCHDOG (1 << 1)
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#define IPMI_WATCH_MASK_CHECK_COMMANDS (1 << 2)
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/*
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* SMI messages
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*
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* When communicating with an SMI, messages come in two formats:
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*
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* * Normal (to a BMC over a BMC interface)
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*
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* * IPMB (over a IPMB to another MC)
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*
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* When normal, commands are sent using the format defined by a
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* standard message over KCS (NetFn must be even):
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*
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* +-----------+-----+------+
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* | NetFn/LUN | Cmd | Data |
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* +-----------+-----+------+
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*
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* And responses, similarly, with an completion code added (NetFn must
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* be odd):
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*
|
||||
* +-----------+-----+------+------+
|
||||
* | NetFn/LUN | Cmd | CC | Data |
|
||||
* +-----------+-----+------+------+
|
||||
*
|
||||
* With normal messages, only commands are sent and only responses are
|
||||
* received.
|
||||
*
|
||||
* In IPMB mode, we are acting as an IPMB device. Commands will be in
|
||||
* the following format (NetFn must be even):
|
||||
*
|
||||
* +-------------+------+-------------+-----+------+
|
||||
* | NetFn/rsLUN | Addr | rqSeq/rqLUN | Cmd | Data |
|
||||
* +-------------+------+-------------+-----+------+
|
||||
*
|
||||
* Responses will using the following format:
|
||||
*
|
||||
* +-------------+------+-------------+-----+------+------+
|
||||
* | NetFn/rqLUN | Addr | rqSeq/rsLUN | Cmd | CC | Data |
|
||||
* +-------------+------+-------------+-----+------+------+
|
||||
*
|
||||
* This is similar to the format defined in the IPMB manual section
|
||||
* 2.11.1 with the checksums and the first address removed. Also, the
|
||||
* address is always the remote address.
|
||||
*
|
||||
* IPMB messages can be commands and responses in both directions.
|
||||
* Received commands are handled as received commands from the message
|
||||
* queue.
|
||||
*/
|
||||
|
||||
enum ipmi_smi_msg_type {
|
||||
IPMI_SMI_MSG_TYPE_NORMAL = 0,
|
||||
IPMI_SMI_MSG_TYPE_IPMB_DIRECT
|
||||
};
|
||||
|
||||
/*
|
||||
* Messages to/from the lower layer. The smi interface will take one
|
||||
* of these to send. After the send has occurred and a response has
|
||||
|
@ -54,6 +107,8 @@ struct ipmi_smi;
|
|||
struct ipmi_smi_msg {
|
||||
struct list_head link;
|
||||
|
||||
enum ipmi_smi_msg_type type;
|
||||
|
||||
long msgid;
|
||||
void *user_data;
|
||||
|
||||
|
@ -73,6 +128,10 @@ struct ipmi_smi_msg {
|
|||
struct ipmi_smi_handlers {
|
||||
struct module *owner;
|
||||
|
||||
/* Capabilities of the SMI. */
|
||||
#define IPMI_SMI_CAN_HANDLE_IPMB_DIRECT (1 << 0)
|
||||
unsigned int flags;
|
||||
|
||||
/*
|
||||
* The low-level interface cannot start sending messages to
|
||||
* the upper layer until this function is called. This may
|
||||
|
|
|
@ -80,6 +80,20 @@ struct ipmi_ipmb_addr {
|
|||
unsigned char lun;
|
||||
};
|
||||
|
||||
/*
|
||||
* Used for messages received directly from an IPMB that have not gone
|
||||
* through a MC. This is for systems that sit right on an IPMB so
|
||||
* they can receive commands and respond to them.
|
||||
*/
|
||||
#define IPMI_IPMB_DIRECT_ADDR_TYPE 0x81
|
||||
struct ipmi_ipmb_direct_addr {
|
||||
int addr_type;
|
||||
short channel;
|
||||
unsigned char slave_addr;
|
||||
unsigned char rs_lun;
|
||||
unsigned char rq_lun;
|
||||
};
|
||||
|
||||
/*
|
||||
* A LAN Address. This is an address to/from a LAN interface bridged
|
||||
* by the BMC, not an address actually out on the LAN.
|
||||
|
|
Loading…
Reference in a new issue