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-rw-r--r--net/ncsi/ncsi-cmd.c367
1 files changed, 367 insertions, 0 deletions
diff --git a/net/ncsi/ncsi-cmd.c b/net/ncsi/ncsi-cmd.c
new file mode 100644
index 000000000000..21057a8ceeac
--- /dev/null
+++ b/net/ncsi/ncsi-cmd.c
@@ -0,0 +1,367 @@
+/*
+ * 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/etherdevice.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"
+
+u32 ncsi_calculate_checksum(unsigned char *data, int len)
+{
+ u32 checksum = 0;
+ int i;
+
+ for (i = 0; i < len; i += 2)
+ checksum += (((u32)data[i] << 8) | data[i + 1]);
+
+ checksum = (~checksum + 1);
+ return checksum;
+}
+
+/* This function should be called after the data area has been
+ * populated completely.
+ */
+static void ncsi_cmd_build_header(struct ncsi_pkt_hdr *h,
+ struct ncsi_cmd_arg *nca)
+{
+ u32 checksum;
+ __be32 *pchecksum;
+
+ h->mc_id = 0;
+ h->revision = NCSI_PKT_REVISION;
+ h->reserved = 0;
+ h->id = nca->id;
+ h->type = nca->type;
+ h->channel = NCSI_TO_CHANNEL(nca->package,
+ nca->channel);
+ h->length = htons(nca->payload);
+ h->reserved1[0] = 0;
+ h->reserved1[1] = 0;
+
+ /* Fill with calculated checksum */
+ checksum = ncsi_calculate_checksum((unsigned char *)h,
+ sizeof(*h) + nca->payload);
+ pchecksum = (__be32 *)((void *)h + sizeof(struct ncsi_pkt_hdr) +
+ nca->payload);
+ *pchecksum = htonl(checksum);
+}
+
+static int ncsi_cmd_handler_default(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_pkt *cmd;
+
+ cmd = (struct ncsi_cmd_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static int ncsi_cmd_handler_sp(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_sp_pkt *cmd;
+
+ cmd = (struct ncsi_cmd_sp_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->hw_arbitration = nca->bytes[0];
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static int ncsi_cmd_handler_dc(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_dc_pkt *cmd;
+
+ cmd = (struct ncsi_cmd_dc_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->ald = nca->bytes[0];
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static int ncsi_cmd_handler_rc(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_rc_pkt *cmd;
+
+ cmd = (struct ncsi_cmd_rc_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static int ncsi_cmd_handler_ae(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_ae_pkt *cmd;
+
+ cmd = (struct ncsi_cmd_ae_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->mc_id = nca->bytes[0];
+ cmd->mode = htonl(nca->dwords[1]);
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static int ncsi_cmd_handler_sl(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_sl_pkt *cmd;
+
+ cmd = (struct ncsi_cmd_sl_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->mode = htonl(nca->dwords[0]);
+ cmd->oem_mode = htonl(nca->dwords[1]);
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static int ncsi_cmd_handler_svf(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_svf_pkt *cmd;
+
+ cmd = (struct ncsi_cmd_svf_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->vlan = htons(nca->words[0]);
+ cmd->index = nca->bytes[2];
+ cmd->enable = nca->bytes[3];
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static int ncsi_cmd_handler_ev(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_ev_pkt *cmd;
+
+ cmd = (struct ncsi_cmd_ev_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->mode = nca->bytes[0];
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static int ncsi_cmd_handler_sma(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_sma_pkt *cmd;
+ int i;
+
+ cmd = (struct ncsi_cmd_sma_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ for (i = 0; i < 6; i++)
+ cmd->mac[i] = nca->bytes[i];
+ cmd->index = nca->bytes[6];
+ cmd->at_e = nca->bytes[7];
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static int ncsi_cmd_handler_ebf(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_ebf_pkt *cmd;
+
+ cmd = (struct ncsi_cmd_ebf_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->mode = htonl(nca->dwords[0]);
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static int ncsi_cmd_handler_egmf(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_egmf_pkt *cmd;
+
+ cmd = (struct ncsi_cmd_egmf_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->mode = htonl(nca->dwords[0]);
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static int ncsi_cmd_handler_snfc(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_cmd_snfc_pkt *cmd;
+
+ cmd = (struct ncsi_cmd_snfc_pkt *)skb_put(skb, sizeof(*cmd));
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->mode = nca->bytes[0];
+ ncsi_cmd_build_header(&cmd->cmd.common, nca);
+
+ return 0;
+}
+
+static struct ncsi_cmd_handler {
+ unsigned char type;
+ int payload;
+ int (*handler)(struct sk_buff *skb,
+ struct ncsi_cmd_arg *nca);
+} ncsi_cmd_handlers[] = {
+ { NCSI_PKT_CMD_CIS, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_SP, 4, ncsi_cmd_handler_sp },
+ { NCSI_PKT_CMD_DP, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_EC, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_DC, 4, ncsi_cmd_handler_dc },
+ { NCSI_PKT_CMD_RC, 4, ncsi_cmd_handler_rc },
+ { NCSI_PKT_CMD_ECNT, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_DCNT, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_AE, 8, ncsi_cmd_handler_ae },
+ { NCSI_PKT_CMD_SL, 8, ncsi_cmd_handler_sl },
+ { NCSI_PKT_CMD_GLS, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_SVF, 4, ncsi_cmd_handler_svf },
+ { NCSI_PKT_CMD_EV, 4, ncsi_cmd_handler_ev },
+ { NCSI_PKT_CMD_DV, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_SMA, 8, ncsi_cmd_handler_sma },
+ { NCSI_PKT_CMD_EBF, 4, ncsi_cmd_handler_ebf },
+ { NCSI_PKT_CMD_DBF, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_EGMF, 4, ncsi_cmd_handler_egmf },
+ { NCSI_PKT_CMD_DGMF, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_SNFC, 4, ncsi_cmd_handler_snfc },
+ { NCSI_PKT_CMD_GVI, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_GC, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_GP, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_GCPS, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_GNS, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_GNPTS, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_GPS, 0, ncsi_cmd_handler_default },
+ { NCSI_PKT_CMD_OEM, 0, NULL },
+ { NCSI_PKT_CMD_PLDM, 0, NULL },
+ { NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default }
+};
+
+static struct ncsi_request *ncsi_alloc_command(struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_dev_priv *ndp = nca->ndp;
+ struct ncsi_dev *nd = &ndp->ndev;
+ struct net_device *dev = nd->dev;
+ int hlen = LL_RESERVED_SPACE(dev);
+ int tlen = dev->needed_tailroom;
+ int len = hlen + tlen;
+ struct sk_buff *skb;
+ struct ncsi_request *nr;
+
+ nr = ncsi_alloc_request(ndp, nca->driven);
+ if (!nr)
+ return NULL;
+
+ /* NCSI command packet has 16-bytes header, payload, 4 bytes checksum.
+ * The packet needs padding if its payload is less than 26 bytes to
+ * meet 64 bytes minimal ethernet frame length.
+ */
+ len += sizeof(struct ncsi_cmd_pkt_hdr) + 4;
+ if (nca->payload < 26)
+ len += 26;
+ else
+ len += nca->payload;
+
+ /* Allocate skb */
+ skb = alloc_skb(len, GFP_ATOMIC);
+ if (!skb) {
+ ncsi_free_request(nr);
+ return NULL;
+ }
+
+ nr->cmd = skb;
+ skb_reserve(skb, hlen);
+ skb_reset_network_header(skb);
+
+ skb->dev = dev;
+ skb->protocol = htons(ETH_P_NCSI);
+
+ return nr;
+}
+
+int ncsi_xmit_cmd(struct ncsi_cmd_arg *nca)
+{
+ struct ncsi_request *nr;
+ struct ethhdr *eh;
+ struct ncsi_cmd_handler *nch = NULL;
+ int i, ret;
+
+ /* Search for the handler */
+ for (i = 0; i < ARRAY_SIZE(ncsi_cmd_handlers); i++) {
+ if (ncsi_cmd_handlers[i].type == nca->type) {
+ if (ncsi_cmd_handlers[i].handler)
+ nch = &ncsi_cmd_handlers[i];
+ else
+ nch = NULL;
+
+ break;
+ }
+ }
+
+ if (!nch) {
+ netdev_err(nca->ndp->ndev.dev,
+ "Cannot send packet with type 0x%02x\n", nca->type);
+ return -ENOENT;
+ }
+
+ /* Get packet payload length and allocate the request */
+ nca->payload = nch->payload;
+ nr = ncsi_alloc_command(nca);
+ if (!nr)
+ return -ENOMEM;
+
+ /* Prepare the packet */
+ nca->id = nr->id;
+ ret = nch->handler(nr->cmd, nca);
+ if (ret) {
+ ncsi_free_request(nr);
+ return ret;
+ }
+
+ /* Fill the ethernet header */
+ eh = (struct ethhdr *)skb_push(nr->cmd, sizeof(*eh));
+ eh->h_proto = htons(ETH_P_NCSI);
+ eth_broadcast_addr(eh->h_dest);
+ eth_broadcast_addr(eh->h_source);
+
+ /* Start the timer for the request that might not have
+ * corresponding response. Given NCSI is an internal
+ * connection a 1 second delay should be sufficient.
+ */
+ nr->enabled = true;
+ mod_timer(&nr->timer, jiffies + 1 * HZ);
+
+ /* Send NCSI packet */
+ skb_get(nr->cmd);
+ ret = dev_queue_xmit(nr->cmd);
+ if (ret < 0) {
+ ncsi_free_request(nr);
+ return ret;
+ }
+
+ return 0;
+}
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