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Release 4.11 net/ncsi/ncsi-rsp.c

Directory: net/ncsi
/*
 * Copyright Gavin Shan, IBM Corporation 2016.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>

#include <net/ncsi.h>
#include <net/net_namespace.h>
#include <net/sock.h>

#include "internal.h"
#include "ncsi-pkt.h"




static int ncsi_validate_rsp_pkt(struct ncsi_request *nr,
				 unsigned short payload)
{
	struct ncsi_rsp_pkt_hdr *h;
	u32 checksum;
	__be32 *pchecksum;

	/* Check NCSI packet header. We don't need validate
         * the packet type, which should have been checked
         * before calling this function.
         */
	h = (struct ncsi_rsp_pkt_hdr *)skb_network_header(nr->rsp);
	if (h->common.revision != NCSI_PKT_REVISION)
		return -EINVAL;
	if (ntohs(h->common.length) != payload)
		return -EINVAL;

	/* Check on code and reason */
	if (ntohs(h->code) != NCSI_PKT_RSP_C_COMPLETED ||
	    ntohs(h->reason) != NCSI_PKT_RSP_R_NO_ERROR)
		return -EINVAL;

	/* Validate checksum, which might be zeroes if the
         * sender doesn't support checksum according to NCSI
         * specification.
         */
	pchecksum = (__be32 *)((void *)(h + 1) + payload - 4);
	if (ntohl(*pchecksum) == 0)
		return 0;

	checksum = ncsi_calculate_checksum((unsigned char *)h,
					   sizeof(*h) + payload - 4);
	if (*pchecksum != htonl(checksum))
		return -EINVAL;

	return 0;
}


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static int ncsi_rsp_handler_cis(struct ncsi_request *nr)
{
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_package *np;
	struct ncsi_channel *nc;
	unsigned char id;

	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel, &np, &nc);
	if (!nc) {
		if (ndp->flags & NCSI_DEV_PROBED)
			return -ENXIO;

		id = NCSI_CHANNEL_INDEX(rsp->rsp.common.channel);
		nc = ncsi_add_channel(np, id);
	}

	return nc ? 0 : -ENODEV;
}


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static int ncsi_rsp_handler_sp(struct ncsi_request *nr)
{
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_package *np;
	unsigned char id;

	/* Add the package if it's not existing. Otherwise,
         * to change the state of its child channels.
         */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      &np, NULL);
	if (!np) {
		if (ndp->flags & NCSI_DEV_PROBED)
			return -ENXIO;

		id = NCSI_PACKAGE_INDEX(rsp->rsp.common.channel);
		np = ncsi_add_package(ndp, id);
		if (!np)
			return -ENODEV;
	}

	return 0;
}


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static int ncsi_rsp_handler_dp(struct ncsi_request *nr)
{
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_package *np;
	struct ncsi_channel *nc;
	unsigned long flags;

	/* Find the package */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      &np, NULL);
	if (!np)
		return -ENODEV;

	/* Change state of all channels attached to the package */
	NCSI_FOR_EACH_CHANNEL(np, nc) {
		spin_lock_irqsave(&nc->lock, flags);
		nc->state = NCSI_CHANNEL_INACTIVE;
		spin_unlock_irqrestore(&nc->lock, flags);
	}

	return 0;
}


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static int ncsi_rsp_handler_ec(struct ncsi_request *nr)
{
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	ncm = &nc->modes[NCSI_MODE_ENABLE];
	if (ncm->enable)
		return -EBUSY;

	ncm->enable = 1;
	return 0;
}


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static int ncsi_rsp_handler_dc(struct ncsi_request *nr)
{
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;
	int ret;

	ret = ncsi_validate_rsp_pkt(nr, 4);
	if (ret)
		return ret;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	ncm = &nc->modes[NCSI_MODE_ENABLE];
	if (!ncm->enable)
		return -EBUSY;

	ncm->enable = 0;
	return 0;
}


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static int ncsi_rsp_handler_rc(struct ncsi_request *nr)
{
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	unsigned long flags;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	/* Update state for the specified channel */
	spin_lock_irqsave(&nc->lock, flags);
	nc->state = NCSI_CHANNEL_INACTIVE;
	spin_unlock_irqrestore(&nc->lock, flags);

	return 0;
}


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static int ncsi_rsp_handler_ecnt(struct ncsi_request *nr)
{
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	ncm = &nc->modes[NCSI_MODE_TX_ENABLE];
	if (ncm->enable)
		return -EBUSY;

	ncm->enable = 1;
	return 0;
}


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static int ncsi_rsp_handler_dcnt(struct ncsi_request *nr)
{
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	ncm = &nc->modes[NCSI_MODE_TX_ENABLE];
	if (!ncm->enable)
		return -EBUSY;

	ncm->enable = 1;
	return 0;
}


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static int ncsi_rsp_handler_ae(struct ncsi_request *nr)
{
	struct ncsi_cmd_ae_pkt *cmd;
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	/* Check if the AEN has been enabled */
	ncm = &nc->modes[NCSI_MODE_AEN];
	if (ncm->enable)
		return -EBUSY;

	/* Update to AEN configuration */
	cmd = (struct ncsi_cmd_ae_pkt *)skb_network_header(nr->cmd);
	ncm->enable = 1;
	ncm->data[0] = cmd->mc_id;
	ncm->data[1] = ntohl(cmd->mode);

	return 0;
}


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static int ncsi_rsp_handler_sl(struct ncsi_request *nr)
{
	struct ncsi_cmd_sl_pkt *cmd;
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	cmd = (struct ncsi_cmd_sl_pkt *)skb_network_header(nr->cmd);
	ncm = &nc->modes[NCSI_MODE_LINK];
	ncm->data[0] = ntohl(cmd->mode);
	ncm->data[1] = ntohl(cmd->oem_mode);

	return 0;
}


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static int ncsi_rsp_handler_gls(struct ncsi_request *nr)
{
	struct ncsi_rsp_gls_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;
	unsigned long flags;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_gls_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	ncm = &nc->modes[NCSI_MODE_LINK];
	ncm->data[2] = ntohl(rsp->status);
	ncm->data[3] = ntohl(rsp->other);
	ncm->data[4] = ntohl(rsp->oem_status);

	if (nr->flags & NCSI_REQ_FLAG_EVENT_DRIVEN)
		return 0;

	/* Reset the channel monitor if it has been enabled */
	spin_lock_irqsave(&nc->lock, flags);
	nc->monitor.state = NCSI_CHANNEL_MONITOR_START;
	spin_unlock_irqrestore(&nc->lock, flags);

	return 0;
}


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static int ncsi_rsp_handler_svf(struct ncsi_request *nr)
{
	struct ncsi_cmd_svf_pkt *cmd;
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_filter *ncf;
	unsigned short vlan;
	int ret;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	cmd = (struct ncsi_cmd_svf_pkt *)skb_network_header(nr->cmd);
	ncf = nc->filters[NCSI_FILTER_VLAN];
	if (!ncf)
		return -ENOENT;
	if (cmd->index >= ncf->total)
		return -ERANGE;

	/* Add or remove the VLAN filter */
	if (!(cmd->enable & 0x1)) {
		ret = ncsi_remove_filter(nc, NCSI_FILTER_VLAN, cmd->index);
	} else {
		vlan = ntohs(cmd->vlan);
		ret = ncsi_add_filter(nc, NCSI_FILTER_VLAN, &vlan);
	}

	return ret;
}


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static int ncsi_rsp_handler_ev(struct ncsi_request *nr)
{
	struct ncsi_cmd_ev_pkt *cmd;
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	/* Check if VLAN mode has been enabled */
	ncm = &nc->modes[NCSI_MODE_VLAN];
	if (ncm->enable)
		return -EBUSY;

	/* Update to VLAN mode */
	cmd = (struct ncsi_cmd_ev_pkt *)skb_network_header(nr->cmd);
	ncm->enable = 1;
	ncm->data[0] = ntohl(cmd->mode);

	return 0;
}


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static int ncsi_rsp_handler_dv(struct ncsi_request *nr)
{
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	/* Check if VLAN mode has been enabled */
	ncm = &nc->modes[NCSI_MODE_VLAN];
	if (!ncm->enable)
		return -EBUSY;

	/* Update to VLAN mode */
	ncm->enable = 0;
	return 0;
}


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static int ncsi_rsp_handler_sma(struct ncsi_request *nr)
{
	struct ncsi_cmd_sma_pkt *cmd;
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_filter *ncf;
	void *bitmap;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	/* According to NCSI spec 1.01, the mixed filter table
         * isn't supported yet.
         */
	cmd = (struct ncsi_cmd_sma_pkt *)skb_network_header(nr->cmd);
	switch (cmd->at_e >> 5) {
	case 0x0:	/* UC address */
		ncf = nc->filters[NCSI_FILTER_UC];
		break;
	case 0x1:	/* MC address */
		ncf = nc->filters[NCSI_FILTER_MC];
		break;
	default:
		return -EINVAL;
	}

	/* Sanity check on the filter */
	if (!ncf)
		return -ENOENT;
	else if (cmd->index >= ncf->total)
		return -ERANGE;

	bitmap = &ncf->bitmap;
	if (cmd->at_e & 0x1) {
		if (test_and_set_bit(cmd->index, bitmap))
			return -EBUSY;
		memcpy(ncf->data + 6 * cmd->index, cmd->mac, 6);
	} else {
		if (!test_and_clear_bit(cmd->index, bitmap))
			return -EBUSY;

		memset(ncf->data + 6 * cmd->index, 0, 6);
	}

	return 0;
}


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static int ncsi_rsp_handler_ebf(struct ncsi_request *nr)
{
	struct ncsi_cmd_ebf_pkt *cmd;
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	/* Find the package and channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel, NULL, &nc);
	if (!nc)
		return -ENODEV;

	/* Check if broadcast filter has been enabled */
	ncm = &nc->modes[NCSI_MODE_BC];
	if (ncm->enable)
		return -EBUSY;

	/* Update to broadcast filter mode */
	cmd = (struct ncsi_cmd_ebf_pkt *)skb_network_header(nr->cmd);
	ncm->enable = 1;
	ncm->data[0] = ntohl(cmd->mode);

	return 0;
}


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static int ncsi_rsp_handler_dbf(struct ncsi_request *nr)
{
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	/* Check if broadcast filter isn't enabled */
	ncm = &nc->modes[NCSI_MODE_BC];
	if (!ncm->enable)
		return -EBUSY;

	/* Update to broadcast filter mode */
	ncm->enable = 0;
	ncm->data[0] = 0;

	return 0;
}


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static int ncsi_rsp_handler_egmf(struct ncsi_request *nr)
{
	struct ncsi_cmd_egmf_pkt *cmd;
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	/* Find the channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	/* Check if multicast filter has been enabled */
	ncm = &nc->modes[NCSI_MODE_MC];
	if (ncm->enable)
		return -EBUSY;

	/* Update to multicast filter mode */
	cmd = (struct ncsi_cmd_egmf_pkt *)skb_network_header(nr->cmd);
	ncm->enable = 1;
	ncm->data[0] = ntohl(cmd->mode);

	return 0;
}


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static int ncsi_rsp_handler_dgmf(struct ncsi_request *nr)
{
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	/* Check if multicast filter has been enabled */
	ncm = &nc->modes[NCSI_MODE_MC];
	if (!ncm->enable)
		return -EBUSY;

	/* Update to multicast filter mode */
	ncm->enable = 0;
	ncm->data[0] = 0;

	return 0;
}


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static int ncsi_rsp_handler_snfc(struct ncsi_request *nr)
{
	struct ncsi_cmd_snfc_pkt *cmd;
	struct ncsi_rsp_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_mode *ncm;

	/* Find the channel */
	rsp = (struct ncsi_rsp_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	/* Check if flow control has been enabled */
	ncm = &nc->modes[NCSI_MODE_FC];
	if (ncm->enable)
		return -EBUSY;

	/* Update to flow control mode */
	cmd = (struct ncsi_cmd_snfc_pkt *)skb_network_header(nr->cmd);
	ncm->enable = 1;
	ncm->data[0] = cmd->mode;

	return 0;
}


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static int ncsi_rsp_handler_gvi(struct ncsi_request *nr)
{
	struct ncsi_rsp_gvi_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_version *ncv;
	int i;

	/* Find the channel */
	rsp = (struct ncsi_rsp_gvi_pkt *)skb_network_header(nr->rsp);
	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
				      NULL, &nc);
	if (!nc)
		return -ENODEV;

	/* Update to channel's version info */
	ncv = &nc->version;
	ncv->version = ntohl(rsp->ncsi_version);
	ncv->alpha2 = rsp->alpha2;
	memcpy(ncv->fw_name, rsp->fw_name, 12);
	ncv->fw_version = ntohl(rsp->fw_version);
	for (i = 0; i < ARRAY_SIZE(ncv->pci_ids); i++)
		ncv->pci_ids[i] = ntohs(rsp->pci_ids[i]);
	ncv->mf_id = ntohl(rsp->mf_id);

	return 0;
}


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static int ncsi_rsp_handler_gc(struct ncsi_request *nr)
{
	struct ncsi_rsp_gc_pkt *rsp;
	struct ncsi_dev_priv *ndp = nr->ndp;
	struct ncsi_channel *nc;
	struct ncsi_channel_filter *ncf;
	size_t size, entry_size;