From: Vidya Sagar Ravipati <vi...@cumulusnetworks.com>
As FEC settings and different FEC modes are mandatory
and configurable across various interfaces of 25G/50G/100G/40G ,
the lack of FEC encoding control and reporting today is a source
for interoperability issues for many vendors
set-fec/show-fec option(s) are designed to provide control and report
the FEC encoding on the link.
root@tor: ethtool --set-fec swp1 encoding [off | RS | BaseR | auto] autoneg
[off | on]
Encoding: Types of encoding
Off : Turning off any encoding
RS : enforcing RS-FEC encoding on supported speeds
BaseR : enforcing Base R encoding on supported speeds
Auto : Default FEC settings for divers , and would represent
asking the hardware to essentially go into a best effort mode.
Here are a few examples of what we would expect if encoding=auto:
- if autoneg is on, we are expecting FEC to be negotiated as on or off
as long as protocol supports it
- if the hardware is capable of detecting the FEC encoding on it's
receiver it will reconfigure its encoder to match
- in absence of the above, the configuration would be set to IEEE
defaults.
>From our understanding , this is essentially what most hardware/driver
combinations are doing today in the absence of a way for users to
control the behavior.
root@tor: ethtool --show-fec swp1
FEC parameters for swp1:
Autonegotiate: off
FEC encodings: RS
ethtool devname output:
root@tor:~# ethtool swp1
Settings for swp1:
root@hpe-7712-03:~# ethtool swp18
Settings for swp18:
Supported ports: [ FIBRE ]
Supported link modes: 40000baseCR4/Full
40000baseSR4/Full
40000baseLR4/Full
100000baseSR4/Full
100000baseCR4/Full
100000baseLR4_ER4/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Supported FEC modes: [RS | BaseR | None | Not reported]
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: No
Advertised FEC modes: [RS | BaseR | None | Not reported]
Speed: 100000Mb/s
Duplex: Full
Port: FIBRE
PHYAD: 106
Transceiver: internal
Auto-negotiation: off
Link detected: yes
Signed-off-by: Vidya Sagar Ravipati <vi...@cumulusnetworks.com>
---
ethtool.c | 152 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 152 insertions(+)
diff --git a/ethtool.c b/ethtool.c
index 49ac94e..7fa058c 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -684,6 +684,7 @@ static void dump_link_caps(const char *prefix, const char
*an_prefix,
};
int indent;
int did1, new_line_pend, i;
+ int fecreported = 0;
/* Indent just like the separate functions used to */
indent = strlen(prefix) + 14;
@@ -735,6 +736,26 @@ static void dump_link_caps(const char *prefix, const char
*an_prefix,
fprintf(stdout, "Yes\n");
else
fprintf(stdout, "No\n");
+
+ fprintf(stdout, " %s FEC modes: ", prefix);
+ if (ethtool_link_mode_test_bit(
+ ETHTOOL_LINK_MODE_FEC_NONE_BIT, mask)) {
+ fprintf(stdout, "None\n");
+ fecreported = 1;
+ }
+ if (ethtool_link_mode_test_bit(
+ ETHTOOL_LINK_MODE_FEC_BASER_BIT, mask)) {
+ fprintf(stdout, "BaseR\n");
+ fecreported = 1;
+ }
+ if (ethtool_link_mode_test_bit(
+ ETHTOOL_LINK_MODE_FEC_RS_BIT, mask)) {
+ fprintf(stdout, "RS\n");
+ fecreported = 1;
+ }
+ if (!fecreported) {
+ fprintf(stdout, "Not reported\n");
+ }
}
}
@@ -1562,6 +1583,42 @@ static void dump_eeecmd(struct ethtool_eee *ep)
dump_link_caps("Link partner advertised EEE", "", link_mode, 1);
}
+static void dump_feccmd(struct ethtool_fecparam *ep)
+{
+ static char buf[300];
+
+ memset(buf, 0, sizeof(buf));
+
+ bool first = true;
+
+ fprintf(stdout,
+ "Auto-negotiation: %s\n",
+ ep->autoneg ? "on" : "off");
+ fprintf(stdout, "FEC encodings :");
+
+ if(ep->fec & ETHTOOL_FEC_NONE) {
+ strcat(buf, "NotSupported");
+ first = false;
+ }
+ if(ep->fec & ETHTOOL_FEC_OFF) {
+ strcat(buf, "None");
+ first = false;
+ }
+ if(ep->fec & ETHTOOL_FEC_BASER) {
+ if (!first)
+ strcat(buf, " | ");
+ strcat(buf, "BaseR");
+ first = false;
+ }
+ if(ep->fec & ETHTOOL_FEC_RS) {
+ if (!first)
+ strcat(buf, " | ");
+ strcat(buf, "RS");
+ first = false;
+ }
+ fprintf(stdout," %s\n", buf);
+}
+
#define N_SOTS 7
static char *so_timestamping_labels[N_SOTS] = {
@@ -4520,6 +4577,97 @@ static int do_seee(struct cmd_context *ctx)
return 0;
}
+static int fecmode_str_to_type(const char *str)
+{
+ int fecmode = 0;
+
+ if (str == NULL)
+ return fecmode;
+
+ if (!strcmp(str, "auto"))
+ fecmode |= ETHTOOL_FEC_AUTO;
+ else if (!strcmp(str, "off"))
+ fecmode |= ETHTOOL_FEC_OFF;
+ else if (!strcmp(str, "rs"))
+ fecmode |= ETHTOOL_FEC_RS;
+ else if (!strcmp(str, "baser"))
+ fecmode |= ETHTOOL_FEC_BASER;
+
+ return fecmode;
+}
+
+static int do_gfec(struct cmd_context *ctx)
+{
+ struct ethtool_fecparam feccmd;
+
+ if (ctx->argc != 0)
+ exit_bad_args();
+
+ fprintf(stdout, "FEC parameters for %s:\n", ctx->devname);
+
+ feccmd.cmd = ETHTOOL_GFECPARAM;
+ if (send_ioctl(ctx, &feccmd)) {
+ perror("Cannot get FEC settings");
+ return 1;
+ }
+
+ dump_feccmd(&feccmd);
+ return 0;
+}
+
+static int do_sfec(struct cmd_context *ctx)
+{
+ int fec_changed = -1;
+ int changed = 1;
+ struct ethtool_fecparam feccmd;
+ int autoneg_val = -1;
+ int fecmode;
+ char *fecmode_str = NULL;
+ struct cmdline_info cmdline_fec[] = {
+ { "autoneg", CMDL_BOOL, &autoneg_val,
+ &feccmd.autoneg },
+ { "encoding", CMDL_STR, &fecmode_str, &feccmd.fec},
+ };
+
+ parse_generic_cmdline(ctx, &fec_changed,
+ cmdline_fec, ARRAY_SIZE(cmdline_fec));
+
+ if(fecmode_str == NULL)
+ exit_bad_args();
+
+ fecmode = fecmode_str_to_type(fecmode_str);
+ if (!fecmode)
+ exit_bad_args();
+
+ /* Get current FEC parameters */
+ feccmd.cmd = ETHTOOL_GFECPARAM;
+ if (send_ioctl(ctx, &feccmd)) {
+ perror("Cannot get FEC settings");
+ return 1;
+ }
+
+ /* Compare autoneg and fec parameter and if they are same, reject it */
+ if (feccmd.fec == fecmode) {
+ if (feccmd.autoneg == autoneg_val) {
+ changed = 0;
+ }
+ }
+
+ if (!changed) {
+ fprintf(stderr, "no fec parameters changed, aborting\n");
+ return 93;
+ }
+
+ feccmd.cmd = ETHTOOL_SFECPARAM;
+ feccmd.fec = fecmode;
+ feccmd.autoneg = autoneg_val;
+ if (send_ioctl(ctx, &feccmd)) {
+ perror("Cannot set FEC settings");
+ return 1;
+ }
+ return 0;
+}
+
#ifndef TEST_ETHTOOL
int send_ioctl(struct cmd_context *ctx, void *cmd)
{
@@ -4681,6 +4829,10 @@ static const struct option {
" [ advertise %x ]\n"
" [ tx-lpi on|off ]\n"
" [ tx-timer %d ]\n"},
+ { "--show-fec", 1, do_gfec, "Show FEC settings"},
+ { "--set-fec", 1, do_sfec, "Set FEC settings",
+ " [ autoneg on|off ]\n"
+ " [ encoding on|off|RS|BaseR ]\n"},
{ "-h|--help", 0, show_usage, "Show this help" },
{ "--version", 0, do_version, "Show version number" },
{}
--
2.1.4
