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/*
* rss.c - netlink implementation of RSS context commands
*
* Implementation of "ethtool -x <dev>"
*/
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include "../internal.h"
#include "../common.h"
#include "netlink.h"
#include "strset.h"
#include "parser.h"
struct cb_args {
struct nl_context *nlctx;
u32 num_rings;
};
void dump_json_rss_info(struct cmd_context *ctx, u32 *indir_table,
u32 indir_size, u8 *hkey, u32 hkey_size,
const struct stringset *hash_funcs, u8 hfunc)
{
unsigned int i;
open_json_object(NULL);
print_string(PRINT_JSON, "ifname", NULL, ctx->devname);
if (indir_size) {
open_json_array("rss-indirection-table", NULL);
for (i = 0; i < indir_size; i++)
print_uint(PRINT_JSON, NULL, NULL, indir_table[i]);
close_json_array("\n");
}
if (hkey_size) {
open_json_array("rss-hash-key", NULL);
for (i = 0; i < hkey_size; i++)
print_uint(PRINT_JSON, NULL, NULL, (u8)hkey[i]);
close_json_array("\n");
}
if (hfunc) {
for (i = 0; i < get_count(hash_funcs); i++) {
if (hfunc & (1 << i)) {
print_string(PRINT_JSON, "rss-hash-function",
NULL, get_string(hash_funcs, i));
break;
}
}
}
close_json_object();
}
int get_channels_cb(const struct nlmsghdr *nlhdr, void *data)
{
const struct nlattr *tb[ETHTOOL_A_CHANNELS_MAX + 1] = {};
DECLARE_ATTR_TB_INFO(tb);
struct cb_args *args = data;
struct nl_context *nlctx = args->nlctx;
bool silent;
int err_ret;
int ret;
silent = nlctx->is_dump || nlctx->is_monitor;
err_ret = silent ? MNL_CB_OK : MNL_CB_ERROR;
ret = mnl_attr_parse(nlhdr, GENL_HDRLEN, attr_cb, &tb_info);
if (ret < 0)
return err_ret;
nlctx->devname = get_dev_name(tb[ETHTOOL_A_CHANNELS_HEADER]);
if (!dev_ok(nlctx))
return err_ret;
if (tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT])
args->num_rings = mnl_attr_get_u32(tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT]);
if (tb[ETHTOOL_A_CHANNELS_RX_COUNT])
args->num_rings += mnl_attr_get_u32(tb[ETHTOOL_A_CHANNELS_RX_COUNT]);
return MNL_CB_OK;
}
int rss_reply_cb(const struct nlmsghdr *nlhdr, void *data)
{
const struct nlattr *tb[ETHTOOL_A_RSS_MAX + 1] = {};
unsigned int indir_bytes = 0, hkey_bytes = 0;
DECLARE_ATTR_TB_INFO(tb);
struct cb_args *args = data;
struct nl_context *nlctx = args->nlctx;
const struct stringset *hash_funcs;
u32 rss_hfunc = 0, indir_size;
u32 *indir_table = NULL;
u8 *hkey = NULL;
bool silent;
int err_ret;
int ret;
silent = nlctx->is_dump || nlctx->is_monitor;
err_ret = silent ? MNL_CB_OK : MNL_CB_ERROR;
ret = mnl_attr_parse(nlhdr, GENL_HDRLEN, attr_cb, &tb_info);
if (ret < 0)
return err_ret;
nlctx->devname = get_dev_name(tb[ETHTOOL_A_RSS_HEADER]);
if (!dev_ok(nlctx))
return err_ret;
show_cr();
if (tb[ETHTOOL_A_RSS_HFUNC])
rss_hfunc = mnl_attr_get_u32(tb[ETHTOOL_A_RSS_HFUNC]);
if (tb[ETHTOOL_A_RSS_INDIR]) {
indir_bytes = mnl_attr_get_payload_len(tb[ETHTOOL_A_RSS_INDIR]);
indir_table = mnl_attr_get_payload(tb[ETHTOOL_A_RSS_INDIR]);
}
if (tb[ETHTOOL_A_RSS_HKEY]) {
hkey_bytes = mnl_attr_get_payload_len(tb[ETHTOOL_A_RSS_HKEY]);
hkey = mnl_attr_get_payload(tb[ETHTOOL_A_RSS_HKEY]);
}
/* Fetch RSS hash functions and their status and print */
if (!nlctx->is_monitor) {
ret = netlink_init_ethnl2_socket(nlctx);
if (ret < 0)
return MNL_CB_ERROR;
}
hash_funcs = global_stringset(ETH_SS_RSS_HASH_FUNCS,
nlctx->ethnl2_socket);
ret = mnl_attr_parse(nlhdr, GENL_HDRLEN, attr_cb, &tb_info);
if (ret < 0)
return silent ? MNL_CB_OK : MNL_CB_ERROR;
nlctx->devname = get_dev_name(tb[ETHTOOL_A_RSS_HEADER]);
if (!dev_ok(nlctx))
return MNL_CB_OK;
/* Fetch ring count info into args->num_rings */
ret = nlsock_prep_get_request(nlctx->ethnl2_socket,
ETHTOOL_MSG_CHANNELS_GET,
ETHTOOL_A_CHANNELS_HEADER, 0);
if (ret < 0)
return MNL_CB_ERROR;
ret = nlsock_sendmsg(nlctx->ethnl2_socket, NULL);
if (ret < 0)
return MNL_CB_ERROR;
ret = nlsock_process_reply(nlctx->ethnl2_socket, get_channels_cb, args);
if (ret < 0)
return MNL_CB_ERROR;
indir_size = indir_bytes / sizeof(u32);
if (is_json_context()) {
dump_json_rss_info(nlctx->ctx, (u32 *)indir_table, indir_size,
hkey, hkey_bytes, hash_funcs, rss_hfunc);
} else {
print_indir_table(nlctx->ctx, args->num_rings,
indir_size, (u32 *)indir_table);
print_rss_hkey(hkey, hkey_bytes);
printf("RSS hash function:\n");
if (!rss_hfunc) {
printf(" Operation not supported\n");
return 0;
}
for (unsigned int i = 0; i < get_count(hash_funcs); i++) {
printf(" %s: %s\n", get_string(hash_funcs, i),
(rss_hfunc & (1 << i)) ? "on" : "off");
}
}
return MNL_CB_OK;
}
/* RSS_GET */
static const struct param_parser grss_params[] = {
{
.arg = "context",
.type = ETHTOOL_A_RSS_CONTEXT,
.handler = nl_parse_direct_u32,
.min_argc = 1,
},
{}
};
int nl_grss(struct cmd_context *ctx)
{
struct nl_context *nlctx = ctx->nlctx;
struct nl_socket *nlsk = nlctx->ethnl_socket;
struct nl_msg_buff *msgbuff;
struct cb_args args = {};
int ret;
nlctx->cmd = "-x";
nlctx->argp = ctx->argp;
nlctx->argc = ctx->argc;
nlctx->devname = ctx->devname;
nlsk = nlctx->ethnl_socket;
msgbuff = &nlsk->msgbuff;
if (netlink_cmd_check(ctx, ETHTOOL_MSG_RSS_GET, true))
return -EOPNOTSUPP;
ret = msg_init(nlctx, msgbuff, ETHTOOL_MSG_RSS_GET,
NLM_F_REQUEST | NLM_F_ACK);
if (ret < 0)
return 1;
if (ethnla_fill_header(msgbuff, ETHTOOL_A_RSS_HEADER,
ctx->devname, 0))
return -EMSGSIZE;
ret = nl_parser(nlctx, grss_params, NULL, PARSER_GROUP_NONE, NULL);
if (ret < 0)
goto err;
ret = nlsock_sendmsg(nlsk, NULL);
if (ret < 0)
goto err;
args.nlctx = nlctx;
new_json_obj(ctx->json);
ret = nlsock_process_reply(nlsk, rss_reply_cb, &args);
delete_json_obj();
if (ret == 0)
return 0;
err:
return nlctx->exit_code ?: 1;
}
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