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slirp: add a fake NC-SI backend

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NC-SI (Network Controller Sideband Interface) enables a BMC to manage
a set of NICs on a system. This model takes the simplest approach and
reverses the NC-SI packets to pretend a NIC is present and exercise
the Linux driver.

The NCSI header file <ncsi-pkt.h> comes from mainline Linux and was
untabified.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Cédric Le Goater 2017-04-14 10:35:03 +02:00 • committed by Jason Wang
parent ea337c6549
commit 47bb83cad4
6 changed files with 558 additions and 1 deletions
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130
slirp/ncsi.c Normal file
View file

@ -0,0 +1,130 @@
/*
* NC-SI (Network Controller Sideband Interface) "echo" model
*
* Copyright (C) 2016 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"
/* 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;
}
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, 36, NULL },
{ NCSI_PKT_RSP_GC, 32, ncsi_rsp_handler_gc },
{ NCSI_PKT_RSP_GP, -1, NULL },
{ 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;
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);
}
} else {
rnh->common.length = 0;
rnh->code = htons(NCSI_PKT_RSP_C_UNAVAILABLE);
rnh->reason = htons(NCSI_PKT_RSP_R_UNKNOWN);
}
/* TODO: add a checksum at the end of the frame but the specs
* allows it to be zero */
slirp_output(slirp->opaque, ncsi_reply, ETH_HLEN + sizeof(*nh) +
(handler ? handler->payload : 0) + 4);
}