The checksum field of a NC-SI packet contains a value that may be included in each command and response. The verification is optional but the Linux driver does so when a non-zero value is provided. Let's extend the model to compute the checksum value and exercise a little more the Linux driver. See section "8.2.2.3 - 2's Complement Checksum Compensation" in the Network Controller Sideband Interface (NC-SI) Specification for more details. Signed-off-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Tested-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
168 lines
5.1 KiB
C
168 lines
5.1 KiB
C
/*
|
|
* NC-SI (Network Controller Sideband Interface) "echo" model
|
|
*
|
|
* Copyright (C) 2016-2018 IBM Corp.
|
|
*
|
|
* This code is licensed under the GPL version 2 or later. See the
|
|
* COPYING file in the top-level directory.
|
|
*/
|
|
#include "qemu/osdep.h"
|
|
#include "slirp.h"
|
|
|
|
#include "ncsi-pkt.h"
|
|
|
|
static uint32_t ncsi_calculate_checksum(uint16_t *data, int len)
|
|
{
|
|
uint32_t checksum = 0;
|
|
int i;
|
|
|
|
/*
|
|
* 32-bit unsigned sum of the NC-SI packet header and NC-SI packet
|
|
* payload interpreted as a series of 16-bit unsigned integer values.
|
|
*/
|
|
for (i = 0; i < len; i++) {
|
|
checksum += htons(data[i]);
|
|
}
|
|
|
|
checksum = (~checksum + 1);
|
|
return checksum;
|
|
}
|
|
|
|
/* Get Capabilities */
|
|
static int ncsi_rsp_handler_gc(struct ncsi_rsp_pkt_hdr *rnh)
|
|
{
|
|
struct ncsi_rsp_gc_pkt *rsp = (struct ncsi_rsp_gc_pkt *) rnh;
|
|
|
|
rsp->cap = htonl(~0);
|
|
rsp->bc_cap = htonl(~0);
|
|
rsp->mc_cap = htonl(~0);
|
|
rsp->buf_cap = htonl(~0);
|
|
rsp->aen_cap = htonl(~0);
|
|
rsp->vlan_mode = 0xff;
|
|
rsp->uc_cnt = 2;
|
|
return 0;
|
|
}
|
|
|
|
/* Get Link status */
|
|
static int ncsi_rsp_handler_gls(struct ncsi_rsp_pkt_hdr *rnh)
|
|
{
|
|
struct ncsi_rsp_gls_pkt *rsp = (struct ncsi_rsp_gls_pkt *) rnh;
|
|
|
|
rsp->status = htonl(0x1);
|
|
return 0;
|
|
}
|
|
|
|
/* Get Parameters */
|
|
static int ncsi_rsp_handler_gp(struct ncsi_rsp_pkt_hdr *rnh)
|
|
{
|
|
struct ncsi_rsp_gp_pkt *rsp = (struct ncsi_rsp_gp_pkt *) rnh;
|
|
|
|
/* no MAC address filters or VLAN filters on the channel */
|
|
rsp->mac_cnt = 0;
|
|
rsp->mac_enable = 0;
|
|
rsp->vlan_cnt = 0;
|
|
rsp->vlan_enable = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct ncsi_rsp_handler {
|
|
unsigned char type;
|
|
int payload;
|
|
int (*handler)(struct ncsi_rsp_pkt_hdr *rnh);
|
|
} ncsi_rsp_handlers[] = {
|
|
{ NCSI_PKT_RSP_CIS, 4, NULL },
|
|
{ NCSI_PKT_RSP_SP, 4, NULL },
|
|
{ NCSI_PKT_RSP_DP, 4, NULL },
|
|
{ NCSI_PKT_RSP_EC, 4, NULL },
|
|
{ NCSI_PKT_RSP_DC, 4, NULL },
|
|
{ NCSI_PKT_RSP_RC, 4, NULL },
|
|
{ NCSI_PKT_RSP_ECNT, 4, NULL },
|
|
{ NCSI_PKT_RSP_DCNT, 4, NULL },
|
|
{ NCSI_PKT_RSP_AE, 4, NULL },
|
|
{ NCSI_PKT_RSP_SL, 4, NULL },
|
|
{ NCSI_PKT_RSP_GLS, 16, ncsi_rsp_handler_gls },
|
|
{ NCSI_PKT_RSP_SVF, 4, NULL },
|
|
{ NCSI_PKT_RSP_EV, 4, NULL },
|
|
{ NCSI_PKT_RSP_DV, 4, NULL },
|
|
{ NCSI_PKT_RSP_SMA, 4, NULL },
|
|
{ NCSI_PKT_RSP_EBF, 4, NULL },
|
|
{ NCSI_PKT_RSP_DBF, 4, NULL },
|
|
{ NCSI_PKT_RSP_EGMF, 4, NULL },
|
|
{ NCSI_PKT_RSP_DGMF, 4, NULL },
|
|
{ NCSI_PKT_RSP_SNFC, 4, NULL },
|
|
{ NCSI_PKT_RSP_GVI, 40, NULL },
|
|
{ NCSI_PKT_RSP_GC, 32, ncsi_rsp_handler_gc },
|
|
{ NCSI_PKT_RSP_GP, 40, ncsi_rsp_handler_gp },
|
|
{ NCSI_PKT_RSP_GCPS, 172, NULL },
|
|
{ NCSI_PKT_RSP_GNS, 172, NULL },
|
|
{ NCSI_PKT_RSP_GNPTS, 172, NULL },
|
|
{ NCSI_PKT_RSP_GPS, 8, NULL },
|
|
{ NCSI_PKT_RSP_OEM, 0, NULL },
|
|
{ NCSI_PKT_RSP_PLDM, 0, NULL },
|
|
{ NCSI_PKT_RSP_GPUUID, 20, NULL }
|
|
};
|
|
|
|
/*
|
|
* packet format : ncsi header + payload + checksum
|
|
*/
|
|
#define NCSI_MAX_PAYLOAD 172
|
|
#define NCSI_MAX_LEN (sizeof(struct ncsi_pkt_hdr) + NCSI_MAX_PAYLOAD + 4)
|
|
|
|
void ncsi_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
|
|
{
|
|
struct ncsi_pkt_hdr *nh = (struct ncsi_pkt_hdr *)(pkt + ETH_HLEN);
|
|
uint8_t ncsi_reply[ETH_HLEN + NCSI_MAX_LEN];
|
|
struct ethhdr *reh = (struct ethhdr *)ncsi_reply;
|
|
struct ncsi_rsp_pkt_hdr *rnh = (struct ncsi_rsp_pkt_hdr *)
|
|
(ncsi_reply + ETH_HLEN);
|
|
const struct ncsi_rsp_handler *handler = NULL;
|
|
int i;
|
|
int ncsi_rsp_len = sizeof(*nh);
|
|
uint32_t checksum;
|
|
uint32_t *pchecksum;
|
|
|
|
memset(ncsi_reply, 0, sizeof(ncsi_reply));
|
|
|
|
memset(reh->h_dest, 0xff, ETH_ALEN);
|
|
memset(reh->h_source, 0xff, ETH_ALEN);
|
|
reh->h_proto = htons(ETH_P_NCSI);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ncsi_rsp_handlers); i++) {
|
|
if (ncsi_rsp_handlers[i].type == nh->type + 0x80) {
|
|
handler = &ncsi_rsp_handlers[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
rnh->common.mc_id = nh->mc_id;
|
|
rnh->common.revision = NCSI_PKT_REVISION;
|
|
rnh->common.id = nh->id;
|
|
rnh->common.type = nh->type + 0x80;
|
|
rnh->common.channel = nh->channel;
|
|
|
|
if (handler) {
|
|
rnh->common.length = htons(handler->payload);
|
|
rnh->code = htons(NCSI_PKT_RSP_C_COMPLETED);
|
|
rnh->reason = htons(NCSI_PKT_RSP_R_NO_ERROR);
|
|
|
|
if (handler->handler) {
|
|
/* TODO: handle errors */
|
|
handler->handler(rnh);
|
|
}
|
|
ncsi_rsp_len += handler->payload;
|
|
} else {
|
|
rnh->common.length = 0;
|
|
rnh->code = htons(NCSI_PKT_RSP_C_UNAVAILABLE);
|
|
rnh->reason = htons(NCSI_PKT_RSP_R_UNKNOWN);
|
|
}
|
|
|
|
/* Add the optional checksum at the end of the frame. */
|
|
checksum = ncsi_calculate_checksum((uint16_t *) rnh, ncsi_rsp_len);
|
|
pchecksum = (uint32_t *)((void *) rnh + ncsi_rsp_len);
|
|
*pchecksum = htonl(checksum);
|
|
ncsi_rsp_len += 4;
|
|
|
|
slirp_output(slirp->opaque, ncsi_reply, ETH_HLEN + ncsi_rsp_len);
|
|
}
|