From: Govindarajulu Varadarajan <_gov...@gmx.com>
Add support for setting/getting driver's tx/rx_copybreak value.
Copybreak is handled through a new ethtool tunable interface.
The kernel support was added in 3.18, commit f0db9b07341 "ethtool:
Add generic options for tunables"
Signed-off-by: Govindarajulu Varadarajan <_gov...@gmx.com>
Signed-off-by: Hadar Hen Zion <had...@mellanox.com>
---
ethtool-copy.h | 1 +
ethtool.c | 227 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 228 insertions(+)
diff --git a/ethtool-copy.h b/ethtool-copy.h
index d23ffc4..f92743b 100644
--- a/ethtool-copy.h
+++ b/ethtool-copy.h
@@ -545,6 +545,7 @@ enum ethtool_stringset {
ETH_SS_NTUPLE_FILTERS,
ETH_SS_FEATURES,
ETH_SS_RSS_HASH_FUNCS,
+ ETH_SS_TUNABLES,
};
/**
diff --git a/ethtool.c b/ethtool.c
index 01b13a6..16b5c41 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -145,6 +145,12 @@ struct cmdline_info {
void *seen_val;
};
+struct ethtool_stunable {
+ cmdline_type_t type;
+ __u32 u32_val;
+ int seen_val;
+};
+
struct flag_info {
const char *name;
u32 value;
@@ -1800,6 +1806,223 @@ static int do_gring(struct cmd_context *ctx)
return 0;
}
+static int get_u32tunable(struct cmd_context *ctx, enum tunable_id id,
+ __u32 *value)
+{
+ struct ethtool_tunable *etuna;
+ int ret;
+
+ etuna = calloc(sizeof(*etuna) + sizeof(__u32), 1);
+ if (!etuna)
+ return 1;
+ etuna->cmd = ETHTOOL_GTUNABLE;
+ etuna->id = id;
+ etuna->type_id = ETHTOOL_TUNABLE_U32;
+ etuna->len = sizeof(__u32);
+ ret = send_ioctl(ctx, etuna);
+ *value = *(__u32 *)((void *)etuna + sizeof(*etuna));
+ free(etuna);
+
+ return ret;
+}
+
+static int print_u32tunable(int err, struct ethtool_gstrings *tunables,
+ enum tunable_id id, const __u32 value)
+{
+ char *tunable_name = (char *)tunables->data + id * ETH_GSTRING_LEN;
+
+ if (err) {
+ switch (errno) {
+ /* Driver does not support this particular tunable
+ * Usually displays 0
+ */
+ case EINVAL:
+ goto print;
+ /* Driver does not support get tunables ops or no such device
+ * No point in proceeding further
+ */
+ case EOPNOTSUPP:
+ case ENODEV:
+ perror("Cannot get device settings");
+ exit(err);
+ default:
+ perror(tunable_name);
+ return err;
+ }
+ }
+print:
+ fprintf(stdout, "%s: %u\n", tunable_name, value);
+
+ return 0;
+}
+
+static int do_gtunables(struct cmd_context *ctx)
+{
+ int err, anyerror = 0;
+ __u32 u32value = 0;
+ struct ethtool_gstrings *tunables;
+ int idx;
+ __u32 n_tunables;
+
+ if (ctx->argc != 0)
+ exit_bad_args();
+
+ tunables = get_stringset(ctx, ETH_SS_TUNABLES, 0, 1);
+ if (!tunables) {
+ perror("Cannot get tunables names");
+ return 1;
+ }
+ if (tunables->len == 0) {
+ fprintf(stderr, "No tunables defined\n");
+ return 1;
+ }
+ n_tunables = tunables->len;
+
+ fprintf(stdout, "Tunables settings for device %s\n", ctx->devname);
+
+ for (idx = 0; idx < n_tunables; idx++) {
+ switch(idx) {
+ case ETHTOOL_ID_UNSPEC:
+ break;
+ case ETHTOOL_RX_COPYBREAK:
+ case ETHTOOL_TX_COPYBREAK:
+ err = get_u32tunable(ctx, idx, &u32value);
+ err = print_u32tunable(err, tunables, idx, u32value);
+ if (err)
+ anyerror = err;
+ break;
+ default:
+ anyerror = EINVAL;
+ }
+ }
+ if (anyerror)
+ fprintf(stderr, "Failed to get all settings. displayed partial
settings\n");
+
+ free(tunables);
+ return anyerror;
+}
+
+static int set_u32tunable(struct cmd_context *ctx, enum tunable_id id,
+ const __u32 value)
+{
+ struct ethtool_tunable *etuna;
+ int ret;
+ __u32 *data;
+
+ etuna = malloc(sizeof(*etuna) + sizeof(__u32));
+ if (!etuna) {
+ perror("Set tunable:");
+ return 1;
+ }
+ data = (void *)etuna + sizeof(*etuna);
+ *data = value;
+ etuna->cmd = ETHTOOL_STUNABLE;
+ etuna->id = id;
+ etuna->type_id = ETHTOOL_TUNABLE_U32;
+ etuna->len = sizeof(__u32);
+ ret = send_ioctl(ctx, etuna);
+ free(etuna);
+
+ return ret;
+}
+
+static int check_set_u32tunable(int err, enum tunable_id id)
+{
+ if (err) {
+ switch (errno) {
+ /* Driver does not support get tunables ops or no such device
+ * No point in proceeding further
+ */
+ case EOPNOTSUPP:
+ case ENODEV:
+ perror("Cannot set device settings");
+ exit(err);
+ default:
+ perror("Check set tunable");
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int do_stunables(struct cmd_context *ctx)
+{
+ int err, anyerr = 0;
+ int tunable_changed = 0;
+ struct ethtool_gstrings *tunables;
+ struct cmdline_info *cmd_tunables = NULL;
+ struct ethtool_stunable *set_tunables = NULL;
+ int idx;
+ __u32 n_tunables;
+
+ tunables = get_stringset(ctx, ETH_SS_TUNABLES, 0, 1);
+ if (!tunables) {
+ perror("Cannot get tunables names");
+ return 1;
+ }
+ if (tunables->len == 0) {
+ fprintf(stderr, "No tunables defined\n");
+ return 1;
+ }
+ n_tunables = tunables->len;
+
+ cmd_tunables = calloc(n_tunables, sizeof(*cmd_tunables));
+ set_tunables = calloc(n_tunables, sizeof(*set_tunables));
+ if (!cmd_tunables || !set_tunables) {
+ anyerr = 1;
+ goto err;
+ }
+
+ for (idx = 0; idx < n_tunables; idx++) {
+ cmd_tunables[idx].name =
+ (char *)tunables->data + idx * ETH_GSTRING_LEN;
+ cmd_tunables[idx].seen_val = &set_tunables[idx].seen_val;
+
+ switch(idx) {
+ case ETHTOOL_ID_UNSPEC:
+ break;
+ case ETHTOOL_RX_COPYBREAK:
+ case ETHTOOL_TX_COPYBREAK:
+ cmd_tunables[idx].wanted_val =
&set_tunables[idx].u32_val;
+ cmd_tunables[idx].type = CMDL_U32;
+ break;
+ default:
+ anyerr = EINVAL;
+ goto err;
+ }
+ }
+
+ parse_generic_cmdline(ctx, &tunable_changed, cmd_tunables, n_tunables);
+
+ for (idx = 0; idx < n_tunables; idx++) {
+ if (set_tunables[idx].seen_val) {
+ switch(idx) {
+ case ETHTOOL_ID_UNSPEC:
+ break;
+ case ETHTOOL_RX_COPYBREAK:
+ case ETHTOOL_TX_COPYBREAK:
+ err = set_u32tunable(ctx, idx,
set_tunables[idx].u32_val);
+ err = check_set_u32tunable(err, idx);
+ if (err)
+ anyerr = err;
+ break;
+ default:
+ anyerr = EINVAL;
+ goto err;
+ }
+ }
+ }
+
+ if (anyerr)
+ fprintf(stderr, "Failed to set requested parameters\n");
+err:
+ free(tunables);
+ free(cmd_tunables);
+ free(set_tunables);
+ return anyerr;
+}
+
static int do_schannels(struct cmd_context *ctx)
{
struct ethtool_channels echannels;
@@ -4050,6 +4273,10 @@ static const struct option {
" [ rx-mini N ]\n"
" [ rx-jumbo N ]\n"
" [ tx N ]\n" },
+ { "-b|--show-tunable", 1, do_gtunables, "Show tunable values" },
+ { "-B|--set-tunable", 1, do_stunables, "Set tunable values",
+ " [ rx-copybreak N]\n"
+ " [ tx-copybreak N]\n" },
{ "-k|--show-features|--show-offload", 1, do_gfeatures,
"Get state of protocol offload and other features" },
{ "-K|--features|--offload", 1, do_sfeatures,
--
1.8.3.1
--
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