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Date: Tue, 19 Dec 2017 13:39:43 -0500
From: "John W. Linville" <linville@...driver.com>
To: Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc: netdev@...r.kernel.org, oss-drivers@...ronome.com,
Dustin Byford <dustin@...ulusnetworks.com>,
Vidya Sagar Ravipati <vidya.chowdary@...il.com>,
Dirk van der Merwe <dirk.vandermerwe@...ronome.com>
Subject: Re: [PATCH ethtool v2] ethtool: Support for FEC encoding control
Applied, thanks!
On Mon, Dec 18, 2017 at 02:57:41PM -0800, Jakub Kicinski wrote:
> From: Dustin Byford <dustin@...ulusnetworks.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.
>
> $ethtool --set-fec swp1 encoding [off | RS | BaseR | auto]
>
> Encoding: Types of encoding
> Off : Turning off FEC
> RS : Force RS-FEC encoding
> BaseR : Force BaseR encoding
> Auto : Default FEC settings for drivers, 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.
>
> $ethtool --show-fec swp1
> FEC parameters for swp1:
> FEC encodings: RS
>
> ethtool devname output:
> $ethtool swp1
> Settings for swp1:
> root@...-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 <vidya.chowdary@...il.com>
> Signed-off-by: Dustin Byford <dustin@...ulusnetworks.com>
> [code style + man page edits + commit message update]
> Signed-off-by: Dirk van der Merwe <dirk.vandermerwe@...ronome.com>
> ---
> v2:
> - don't break lines after opening parnes.
>
> ethtool.8.in | 31 ++++++++++++++++
> ethtool.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 150 insertions(+)
>
> diff --git a/ethtool.8.in b/ethtool.8.in
> index 7ca8bfe43607..9573ffdc985d 100644
> --- a/ethtool.8.in
> +++ b/ethtool.8.in
> @@ -378,6 +378,13 @@ ethtool \- query or control network driver and hardware settings
> .RB [ ap-shared ]
> .RB [ dedicated ]
> .RB [ all ]
> +.HP
> +.B ethtool \-\-show\-fec
> +.I devname
> +.HP
> +.B ethtool \-\-set\-fec
> +.I devname
> +.B4 encoding auto off rs baser
> .
> .\" Adjust lines (i.e. full justification) and hyphenate.
> .ad
> @@ -1070,6 +1077,30 @@ All components dedicated to this interface
> .B all
> All components used by this interface, even if shared
> .RE
> +.TP
> +.B \-\-show\-fec
> +Queries the specified network device for its support of Forward Error Correction.
> +.TP
> +.B \-\-set\-fec
> +Configures Forward Error Correction for the specified network device.
> +
> +Forward Error Correction modes selected by a user are expected to be persisted
> +after any hotplug events. If a module is swapped that does not support the
> +current FEC mode, the driver or firmware must take the link down
> +administratively and report the problem in the system logs for users to correct.
> +.RS 4
> +.TP
> +.A4 encoding auto off rs baser
> +Sets the FEC encoding for the device.
> +.TS
> +nokeep;
> +lB l.
> +auto Use the driver's default encoding
> +off Turn off FEC
> +RS Force RS-FEC encoding
> +BaseR Force BaseR encoding
> +.TE
> +.RE
> .SH BUGS
> Not supported (in part or whole) on all network drivers.
> .SH AUTHOR
> diff --git a/ethtool.c b/ethtool.c
> index 488f6bfb8378..79c076e42c6e 100644
> --- a/ethtool.c
> +++ b/ethtool.c
> @@ -542,6 +542,9 @@ static void init_global_link_mode_masks(void)
> ETHTOOL_LINK_MODE_Pause_BIT,
> ETHTOOL_LINK_MODE_Asym_Pause_BIT,
> ETHTOOL_LINK_MODE_Backplane_BIT,
> + ETHTOOL_LINK_MODE_FEC_NONE_BIT,
> + ETHTOOL_LINK_MODE_FEC_RS_BIT,
> + ETHTOOL_LINK_MODE_FEC_BASER_BIT,
> };
> unsigned int i;
>
> @@ -689,6 +692,7 @@ 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;
> @@ -740,6 +744,26 @@ 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");
> + fecreported = 1;
> + }
> + if (ethtool_link_mode_test_bit(ETHTOOL_LINK_MODE_FEC_BASER_BIT,
> + mask)) {
> + fprintf(stdout, " BaseR");
> + fecreported = 1;
> + }
> + if (ethtool_link_mode_test_bit(ETHTOOL_LINK_MODE_FEC_RS_BIT,
> + mask)) {
> + fprintf(stdout, " RS");
> + fecreported = 1;
> + }
> + if (!fecreported)
> + fprintf(stdout, " Not reported");
> + fprintf(stdout, "\n");
> }
> }
>
> @@ -1562,6 +1586,20 @@ static void dump_eeecmd(struct ethtool_eee *ep)
> dump_link_caps("Link partner advertised EEE", "", link_mode, 1);
> }
>
> +static void dump_fec(u32 fec)
> +{
> + if (fec & ETHTOOL_FEC_NONE)
> + fprintf(stdout, " None");
> + if (fec & ETHTOOL_FEC_AUTO)
> + fprintf(stdout, " Auto");
> + if (fec & ETHTOOL_FEC_OFF)
> + fprintf(stdout, " Off");
> + if (fec & ETHTOOL_FEC_BASER)
> + fprintf(stdout, " BaseR");
> + if (fec & ETHTOOL_FEC_RS)
> + fprintf(stdout, " RS");
> +}
> +
> #define N_SOTS 7
>
> static char *so_timestamping_labels[N_SOTS] = {
> @@ -4812,6 +4850,84 @@ static int do_set_phy_tunable(struct cmd_context *ctx)
> return err;
> }
>
> +static int fecmode_str_to_type(const char *str)
> +{
> + int fecmode = 0;
> +
> + if (!str)
> + return fecmode;
> +
> + if (!strcasecmp(str, "auto"))
> + fecmode |= ETHTOOL_FEC_AUTO;
> + else if (!strcasecmp(str, "off"))
> + fecmode |= ETHTOOL_FEC_OFF;
> + else if (!strcasecmp(str, "rs"))
> + fecmode |= ETHTOOL_FEC_RS;
> + else if (!strcasecmp(str, "baser"))
> + fecmode |= ETHTOOL_FEC_BASER;
> +
> + return fecmode;
> +}
> +
> +static int do_gfec(struct cmd_context *ctx)
> +{
> + struct ethtool_fecparam feccmd = { 0 };
> + int rv;
> +
> + if (ctx->argc != 0)
> + exit_bad_args();
> +
> + feccmd.cmd = ETHTOOL_GFECPARAM;
> + rv = send_ioctl(ctx, &feccmd);
> + if (rv != 0) {
> + perror("Cannot get FEC settings");
> + return rv;
> + }
> +
> + fprintf(stdout, "FEC parameters for %s:\n", ctx->devname);
> + fprintf(stdout, "Configured FEC encodings:");
> + dump_fec(feccmd.fec);
> + fprintf(stdout, "\n");
> +
> + fprintf(stdout, "Active FEC encoding:");
> + dump_fec(feccmd.active_fec);
> + fprintf(stdout, "\n");
> +
> + return 0;
> +}
> +
> +static int do_sfec(struct cmd_context *ctx)
> +{
> + char *fecmode_str = NULL;
> + struct ethtool_fecparam feccmd;
> + struct cmdline_info cmdline_fec[] = {
> + { "encoding", CMDL_STR, &fecmode_str, &feccmd.fec},
> + };
> + int changed;
> + int fecmode;
> + int rv;
> +
> + parse_generic_cmdline(ctx, &changed, cmdline_fec,
> + ARRAY_SIZE(cmdline_fec));
> +
> + if (!fecmode_str)
> + exit_bad_args();
> +
> + fecmode = fecmode_str_to_type(fecmode_str);
> + if (!fecmode)
> + exit_bad_args();
> +
> + feccmd.cmd = ETHTOOL_SFECPARAM;
> + feccmd.fec = fecmode;
> + rv = send_ioctl(ctx, &feccmd);
> + if (rv != 0) {
> + perror("Cannot set FEC settings");
> + return rv;
> + }
> +
> + return 0;
> +}
> +
> #ifndef TEST_ETHTOOL
> int send_ioctl(struct cmd_context *ctx, void *cmd)
> {
> @@ -5000,6 +5116,9 @@ static const struct option {
> " [ ap-shared ]\n"
> " [ dedicated ]\n"
> " [ all ]\n"},
> + { "--show-fec", 1, do_gfec, "Show FEC settings"},
> + { "--set-fec", 1, do_sfec, "Set FEC settings",
> + " [ encoding auto|off|rs|baser ]\n"},
> { "-h|--help", 0, show_usage, "Show this help" },
> { "--version", 0, do_version, "Show version number" },
> {}
> --
> 2.15.1
>
>
--
John W. Linville Someday the world will need a hero, and you
linville@...driver.com might be all we have. Be ready.
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