net/ncsi: NCSI response packet handler

The NCSI response packets are sent to MC (Management Controller)
from the remote end. They are responses of NCSI command packets
for multiple purposes: completion status of NCSI command packets,
return NCSI channel's capability or configuration etc.

This defines struct to represent NCSI response packets and introduces
function ncsi_rcv_rsp() which will be used to receive NCSI response
packets and parse them.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1016 insertions, 0 deletions

diff --git a/net/ncsi/ncsi-rsp.c b/net/ncsi/ncsi-rsp.c
new file mode 100644
index 000000000000..6ec25cb2608c
--- /dev/null
+++ b/net/ncsi/ncsi-rsp.c
@@ -0,0 +1,1016 @@
+/*
+ * 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;
+}
+
+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) {
+		id = NCSI_CHANNEL_INDEX(rsp->rsp.common.channel);
+		nc = ncsi_add_channel(np, id);
+	}
+
+	return nc ? 0 : -ENODEV;
+}
+
+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) {
+		id = NCSI_PACKAGE_INDEX(rsp->rsp.common.channel);
+		np = ncsi_add_package(ndp, id);
+		if (!np)
+			return -ENODEV;
+	}
+
+	return 0;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+
+	/* 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);
+
+	return 0;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+	int cnt, i;
+
+	/* Find the channel */
+	rsp = (struct ncsi_rsp_gc_pkt *)skb_network_header(nr->rsp);
+	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
+				      NULL, &nc);
+	if (!nc)
+		return -ENODEV;
+
+	/* Update channel's capabilities */
+	nc->caps[NCSI_CAP_GENERIC].cap = ntohl(rsp->cap) &
+					 NCSI_CAP_GENERIC_MASK;
+	nc->caps[NCSI_CAP_BC].cap = ntohl(rsp->bc_cap) &
+				    NCSI_CAP_BC_MASK;
+	nc->caps[NCSI_CAP_MC].cap = ntohl(rsp->mc_cap) &
+				    NCSI_CAP_MC_MASK;
+	nc->caps[NCSI_CAP_BUFFER].cap = ntohl(rsp->buf_cap);
+	nc->caps[NCSI_CAP_AEN].cap = ntohl(rsp->aen_cap) &
+				     NCSI_CAP_AEN_MASK;
+	nc->caps[NCSI_CAP_VLAN].cap = rsp->vlan_mode &
+				      NCSI_CAP_VLAN_MASK;
+
+	/* Build filters */
+	for (i = 0; i < NCSI_FILTER_MAX; i++) {
+		switch (i) {
+		case NCSI_FILTER_VLAN:
+			cnt = rsp->vlan_cnt;
+			entry_size = 2;
+			break;
+		case NCSI_FILTER_MIXED:
+			cnt = rsp->mixed_cnt;
+			entry_size = 6;
+			break;
+		case NCSI_FILTER_MC:
+			cnt = rsp->mc_cnt;
+			entry_size = 6;
+			break;
+		case NCSI_FILTER_UC:
+			cnt = rsp->uc_cnt;
+			entry_size = 6;
+			break;
+		default:
+			continue;
+		}
+
+		if (!cnt || nc->filters[i])
+			continue;
+
+		size = sizeof(*ncf) + cnt * entry_size;
+		ncf = kzalloc(size, GFP_ATOMIC);
+		if (!ncf) {
+			pr_warn("%s: Cannot alloc filter table (%d)\n",
+				__func__, i);
+			return -ENOMEM;
+		}
+
+		ncf->index = i;
+		ncf->total = cnt;
+		ncf->bitmap = 0x0ul;
+		nc->filters[i] = ncf;
+	}
+
+	return 0;
+}
+
+static int ncsi_rsp_handler_gp(struct ncsi_request *nr)
+{
+	struct ncsi_rsp_gp_pkt *rsp;
+	struct ncsi_dev_priv *ndp = nr->ndp;
+	struct ncsi_channel *nc;
+	unsigned short enable, vlan;
+	unsigned char *pdata;
+	int table, i;
+
+	/* Find the channel */
+	rsp = (struct ncsi_rsp_gp_pkt *)skb_network_header(nr->rsp);
+	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
+				      NULL, &nc);
+	if (!nc)
+		return -ENODEV;
+
+	/* Modes with explicit enabled indications */
+	if (ntohl(rsp->valid_modes) & 0x1) {	/* BC filter mode */
+		nc->modes[NCSI_MODE_BC].enable = 1;
+		nc->modes[NCSI_MODE_BC].data[0] = ntohl(rsp->bc_mode);
+	}
+	if (ntohl(rsp->valid_modes) & 0x2)	/* Channel enabled */
+		nc->modes[NCSI_MODE_ENABLE].enable = 1;
+	if (ntohl(rsp->valid_modes) & 0x4)	/* Channel Tx enabled */
+		nc->modes[NCSI_MODE_TX_ENABLE].enable = 1;
+	if (ntohl(rsp->valid_modes) & 0x8)	/* MC filter mode */
+		nc->modes[NCSI_MODE_MC].enable = 1;
+
+	/* Modes without explicit enabled indications */
+	nc->modes[NCSI_MODE_LINK].enable = 1;
+	nc->modes[NCSI_MODE_LINK].data[0] = ntohl(rsp->link_mode);
+	nc->modes[NCSI_MODE_VLAN].enable = 1;
+	nc->modes[NCSI_MODE_VLAN].data[0] = rsp->vlan_mode;
+	nc->modes[NCSI_MODE_FC].enable = 1;
+	nc->modes[NCSI_MODE_FC].data[0] = rsp->fc_mode;
+	nc->modes[NCSI_MODE_AEN].enable = 1;
+	nc->modes[NCSI_MODE_AEN].data[0] = ntohl(rsp->aen_mode);
+
+	/* MAC addresses filter table */
+	pdata = (unsigned char *)rsp + 48;
+	enable = rsp->mac_enable;
+	for (i = 0; i < rsp->mac_cnt; i++, pdata += 6) {
+		if (i >= (nc->filters[NCSI_FILTER_UC]->total +
+			  nc->filters[NCSI_FILTER_MC]->total))
+			table = NCSI_FILTER_MIXED;
+		else if (i >= nc->filters[NCSI_FILTER_UC]->total)
+			table = NCSI_FILTER_MC;
+		else
+			table = NCSI_FILTER_UC;
+
+		if (!(enable & (0x1 << i)))
+			continue;
+
+		if (ncsi_find_filter(nc, table, pdata) >= 0)
+			continue;
+
+		ncsi_add_filter(nc, table, pdata);
+	}
+
+	/* VLAN filter table */
+	enable = ntohs(rsp->vlan_enable);
+	for (i = 0; i < rsp->vlan_cnt; i++, pdata += 2) {
+		if (!(enable & (0x1 << i)))
+			continue;
+
+		vlan = ntohs(*(__be16 *)pdata);
+		if (ncsi_find_filter(nc, NCSI_FILTER_VLAN, &vlan) >= 0)
+			continue;
+
+		ncsi_add_filter(nc, NCSI_FILTER_VLAN, &vlan);
+	}
+
+	return 0;
+}
+
+static int ncsi_rsp_handler_gcps(struct ncsi_request *nr)
+{
+	struct ncsi_rsp_gcps_pkt *rsp;
+	struct ncsi_dev_priv *ndp = nr->ndp;
+	struct ncsi_channel *nc;
+	struct ncsi_channel_stats *ncs;
+
+	/* Find the channel */
+	rsp = (struct ncsi_rsp_gcps_pkt *)skb_network_header(nr->rsp);
+	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
+				      NULL, &nc);
+	if (!nc)
+		return -ENODEV;
+
+	/* Update HNC's statistics */
+	ncs = &nc->stats;
+	ncs->hnc_cnt_hi         = ntohl(rsp->cnt_hi);
+	ncs->hnc_cnt_lo         = ntohl(rsp->cnt_lo);
+	ncs->hnc_rx_bytes       = ntohl(rsp->rx_bytes);
+	ncs->hnc_tx_bytes       = ntohl(rsp->tx_bytes);
+	ncs->hnc_rx_uc_pkts     = ntohl(rsp->rx_uc_pkts);
+	ncs->hnc_rx_mc_pkts     = ntohl(rsp->rx_mc_pkts);
+	ncs->hnc_rx_bc_pkts     = ntohl(rsp->rx_bc_pkts);
+	ncs->hnc_tx_uc_pkts     = ntohl(rsp->tx_uc_pkts);
+	ncs->hnc_tx_mc_pkts     = ntohl(rsp->tx_mc_pkts);
+	ncs->hnc_tx_bc_pkts     = ntohl(rsp->tx_bc_pkts);
+	ncs->hnc_fcs_err        = ntohl(rsp->fcs_err);
+	ncs->hnc_align_err      = ntohl(rsp->align_err);
+	ncs->hnc_false_carrier  = ntohl(rsp->false_carrier);
+	ncs->hnc_runt_pkts      = ntohl(rsp->runt_pkts);
+	ncs->hnc_jabber_pkts    = ntohl(rsp->jabber_pkts);
+	ncs->hnc_rx_pause_xon   = ntohl(rsp->rx_pause_xon);
+	ncs->hnc_rx_pause_xoff  = ntohl(rsp->rx_pause_xoff);
+	ncs->hnc_tx_pause_xon   = ntohl(rsp->tx_pause_xon);
+	ncs->hnc_tx_pause_xoff  = ntohl(rsp->tx_pause_xoff);
+	ncs->hnc_tx_s_collision = ntohl(rsp->tx_s_collision);
+	ncs->hnc_tx_m_collision = ntohl(rsp->tx_m_collision);
+	ncs->hnc_l_collision    = ntohl(rsp->l_collision);
+	ncs->hnc_e_collision    = ntohl(rsp->e_collision);
+	ncs->hnc_rx_ctl_frames  = ntohl(rsp->rx_ctl_frames);
+	ncs->hnc_rx_64_frames   = ntohl(rsp->rx_64_frames);
+	ncs->hnc_rx_127_frames  = ntohl(rsp->rx_127_frames);
+	ncs->hnc_rx_255_frames  = ntohl(rsp->rx_255_frames);
+	ncs->hnc_rx_511_frames  = ntohl(rsp->rx_511_frames);
+	ncs->hnc_rx_1023_frames = ntohl(rsp->rx_1023_frames);
+	ncs->hnc_rx_1522_frames = ntohl(rsp->rx_1522_frames);
+	ncs->hnc_rx_9022_frames = ntohl(rsp->rx_9022_frames);
+	ncs->hnc_tx_64_frames   = ntohl(rsp->tx_64_frames);
+	ncs->hnc_tx_127_frames  = ntohl(rsp->tx_127_frames);
+	ncs->hnc_tx_255_frames  = ntohl(rsp->tx_255_frames);
+	ncs->hnc_tx_511_frames  = ntohl(rsp->tx_511_frames);
+	ncs->hnc_tx_1023_frames = ntohl(rsp->tx_1023_frames);
+	ncs->hnc_tx_1522_frames = ntohl(rsp->tx_1522_frames);
+	ncs->hnc_tx_9022_frames = ntohl(rsp->tx_9022_frames);
+	ncs->hnc_rx_valid_bytes = ntohl(rsp->rx_valid_bytes);
+	ncs->hnc_rx_runt_pkts   = ntohl(rsp->rx_runt_pkts);
+	ncs->hnc_rx_jabber_pkts = ntohl(rsp->rx_jabber_pkts);
+
+	return 0;
+}
+
+static int ncsi_rsp_handler_gns(struct ncsi_request *nr)
+{
+	struct ncsi_rsp_gns_pkt *rsp;
+	struct ncsi_dev_priv *ndp = nr->ndp;
+	struct ncsi_channel *nc;
+	struct ncsi_channel_stats *ncs;
+
+	/* Find the channel */
+	rsp = (struct ncsi_rsp_gns_pkt *)skb_network_header(nr->rsp);
+	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
+				      NULL, &nc);
+	if (!nc)
+		return -ENODEV;
+
+	/* Update HNC's statistics */
+	ncs = &nc->stats;
+	ncs->ncsi_rx_cmds       = ntohl(rsp->rx_cmds);
+	ncs->ncsi_dropped_cmds  = ntohl(rsp->dropped_cmds);
+	ncs->ncsi_cmd_type_errs = ntohl(rsp->cmd_type_errs);
+	ncs->ncsi_cmd_csum_errs = ntohl(rsp->cmd_csum_errs);
+	ncs->ncsi_rx_pkts       = ntohl(rsp->rx_pkts);
+	ncs->ncsi_tx_pkts       = ntohl(rsp->tx_pkts);
+	ncs->ncsi_tx_aen_pkts   = ntohl(rsp->tx_aen_pkts);
+
+	return 0;
+}
+
+static int ncsi_rsp_handler_gnpts(struct ncsi_request *nr)
+{
+	struct ncsi_rsp_gnpts_pkt *rsp;
+	struct ncsi_dev_priv *ndp = nr->ndp;
+	struct ncsi_channel *nc;
+	struct ncsi_channel_stats *ncs;
+
+	/* Find the channel */
+	rsp = (struct ncsi_rsp_gnpts_pkt *)skb_network_header(nr->rsp);
+	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
+				      NULL, &nc);
+	if (!nc)
+		return -ENODEV;
+
+	/* Update HNC's statistics */
+	ncs = &nc->stats;
+	ncs->pt_tx_pkts        = ntohl(rsp->tx_pkts);
+	ncs->pt_tx_dropped     = ntohl(rsp->tx_dropped);
+	ncs->pt_tx_channel_err = ntohl(rsp->tx_channel_err);
+	ncs->pt_tx_us_err      = ntohl(rsp->tx_us_err);
+	ncs->pt_rx_pkts        = ntohl(rsp->rx_pkts);
+	ncs->pt_rx_dropped     = ntohl(rsp->rx_dropped);
+	ncs->pt_rx_channel_err = ntohl(rsp->rx_channel_err);
+	ncs->pt_rx_us_err      = ntohl(rsp->rx_us_err);
+	ncs->pt_rx_os_err      = ntohl(rsp->rx_os_err);
+
+	return 0;
+}
+
+static int ncsi_rsp_handler_gps(struct ncsi_request *nr)
+{
+	struct ncsi_rsp_gps_pkt *rsp;
+	struct ncsi_dev_priv *ndp = nr->ndp;
+	struct ncsi_package *np;
+
+	/* Find the package */
+	rsp = (struct ncsi_rsp_gps_pkt *)skb_network_header(nr->rsp);
+	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
+				      &np, NULL);
+	if (!np)
+		return -ENODEV;
+
+	return 0;
+}
+
+static int ncsi_rsp_handler_gpuuid(struct ncsi_request *nr)
+{
+	struct ncsi_rsp_gpuuid_pkt *rsp;
+	struct ncsi_dev_priv *ndp = nr->ndp;
+	struct ncsi_package *np;
+
+	/* Find the package */
+	rsp = (struct ncsi_rsp_gpuuid_pkt *)skb_network_header(nr->rsp);
+	ncsi_find_package_and_channel(ndp, rsp->rsp.common.channel,
+				      &np, NULL);
+	if (!np)
+		return -ENODEV;
+
+	memcpy(np->uuid, rsp->uuid, sizeof(rsp->uuid));
+
+	return 0;
+}
+
+static struct ncsi_rsp_handler {
+	unsigned char	type;
+	int             payload;
+	int		(*handler)(struct ncsi_request *nr);
+} ncsi_rsp_handlers[] = {
+	{ NCSI_PKT_RSP_CIS,     4, ncsi_rsp_handler_cis     },
+	{ NCSI_PKT_RSP_SP,      4, ncsi_rsp_handler_sp      },
+	{ NCSI_PKT_RSP_DP,      4, ncsi_rsp_handler_dp      },
+	{ NCSI_PKT_RSP_EC,      4, ncsi_rsp_handler_ec      },
+	{ NCSI_PKT_RSP_DC,      4, ncsi_rsp_handler_dc      },
+	{ NCSI_PKT_RSP_RC,      4, ncsi_rsp_handler_rc      },
+	{ NCSI_PKT_RSP_ECNT,    4, ncsi_rsp_handler_ecnt    },
+	{ NCSI_PKT_RSP_DCNT,    4, ncsi_rsp_handler_dcnt    },
+	{ NCSI_PKT_RSP_AE,      4, ncsi_rsp_handler_ae      },
+	{ NCSI_PKT_RSP_SL,      4, ncsi_rsp_handler_sl      },
+	{ NCSI_PKT_RSP_GLS,    16, ncsi_rsp_handler_gls     },
+	{ NCSI_PKT_RSP_SVF,     4, ncsi_rsp_handler_svf     },
+	{ NCSI_PKT_RSP_EV,      4, ncsi_rsp_handler_ev      },
+	{ NCSI_PKT_RSP_DV,      4, ncsi_rsp_handler_dv      },
+	{ NCSI_PKT_RSP_SMA,     4, ncsi_rsp_handler_sma     },
+	{ NCSI_PKT_RSP_EBF,     4, ncsi_rsp_handler_ebf     },
+	{ NCSI_PKT_RSP_DBF,     4, ncsi_rsp_handler_dbf     },
+	{ NCSI_PKT_RSP_EGMF,    4, ncsi_rsp_handler_egmf    },
+	{ NCSI_PKT_RSP_DGMF,    4, ncsi_rsp_handler_dgmf    },
+	{ NCSI_PKT_RSP_SNFC,    4, ncsi_rsp_handler_snfc    },
+	{ NCSI_PKT_RSP_GVI,    36, ncsi_rsp_handler_gvi     },
+	{ NCSI_PKT_RSP_GC,     32, ncsi_rsp_handler_gc      },
+	{ NCSI_PKT_RSP_GP,     -1, ncsi_rsp_handler_gp      },
+	{ NCSI_PKT_RSP_GCPS,  172, ncsi_rsp_handler_gcps    },
+	{ NCSI_PKT_RSP_GNS,   172, ncsi_rsp_handler_gns     },
+	{ NCSI_PKT_RSP_GNPTS, 172, ncsi_rsp_handler_gnpts   },
+	{ NCSI_PKT_RSP_GPS,     8, ncsi_rsp_handler_gps     },
+	{ NCSI_PKT_RSP_OEM,     0, NULL                     },
+	{ NCSI_PKT_RSP_PLDM,    0, NULL                     },
+	{ NCSI_PKT_RSP_GPUUID, 20, ncsi_rsp_handler_gpuuid  }
+};
+
+int ncsi_rcv_rsp(struct sk_buff *skb, struct net_device *dev,
+		 struct packet_type *pt, struct net_device *orig_dev)
+{
+	struct ncsi_rsp_handler *nrh = NULL;
+	struct ncsi_dev *nd;
+	struct ncsi_dev_priv *ndp;
+	struct ncsi_request *nr;
+	struct ncsi_pkt_hdr *hdr;
+	unsigned long flags;
+	int payload, i, ret;
+
+	/* Find the NCSI device */
+	nd = ncsi_find_dev(dev);
+	ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
+	if (!ndp)
+		return -ENODEV;
+
+	/* Find the handler */
+	hdr = (struct ncsi_pkt_hdr *)skb_network_header(skb);
+	for (i = 0; i < ARRAY_SIZE(ncsi_rsp_handlers); i++) {
+		if (ncsi_rsp_handlers[i].type == hdr->type) {
+			if (ncsi_rsp_handlers[i].handler)
+				nrh = &ncsi_rsp_handlers[i];
+			else
+				nrh = NULL;
+
+			break;
+		}
+	}
+
+	if (!nrh) {
+		netdev_err(nd->dev, "Received unrecognized packet (0x%x)\n",
+			   hdr->type);
+		return -ENOENT;
+	}
+
+	/* Associate with the request */
+	spin_lock_irqsave(&ndp->lock, flags);
+	nr = &ndp->requests[hdr->id];
+	if (!nr->used) {
+		spin_unlock_irqrestore(&ndp->lock, flags);
+		return -ENODEV;
+	}
+
+	nr->rsp = skb;
+	if (!nr->enabled) {
+		spin_unlock_irqrestore(&ndp->lock, flags);
+		ret = -ENOENT;
+		goto out;
+	}
+
+	/* Validate the packet */
+	spin_unlock_irqrestore(&ndp->lock, flags);
+	payload = nrh->payload;
+	if (payload < 0)
+		payload = ntohs(hdr->length);
+	ret = ncsi_validate_rsp_pkt(nr, payload);
+	if (ret)
+		goto out;
+
+	/* Process the packet */
+	ret = nrh->handler(nr);
+out:
+	ncsi_free_request(nr);
+	return ret;
+}