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Date: Fri, 27 Mar 2020 11:51:08 +0100
From: Michal Kubecek <mkubecek@...e.cz>
To: netdev@...r.kernel.org
Cc: Tariq Toukan <tariqt@...lanox.com>,
"John W . Linville" <linville@...driver.com>,
Aya Levin <ayal@...lanox.com>,
Eran Ben Elisha <eranbe@...lanox.com>
Subject: Re: [PATCH V3 ethtool] ethtool: Add support for Low Latency Reed
Solomon
On Thu, Mar 26, 2020 at 01:09:29PM +0200, Tariq Toukan wrote:
> From: Aya Levin <ayal@...lanox.com>
>
> Introduce a new FEC mode LLRS: Low Latency Reed Solomon, update print
> and initialization functions accordingly. In addition, update related
> man page.
>
> Signed-off-by: Aya Levin <ayal@...lanox.com>
> Reviewed-by: Eran Ben Elisha <eranbe@...lanox.com>
> Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
> ---
Reviewed-by: Michal Kubecek <mkubecek@...e.cz>
The kernel counterpart is only in net-next at the moment so that,
technically, this should wait until after ethtool 5.6 is released.
On the other hand, having the entry in link_modes array would improve
compatibility with future kernels so that it would make sense to apply
this patch now.
Michal
> ethtool.8.in | 5 +++--
> ethtool.c | 14 ++++++++++++--
> netlink/settings.c | 2 ++
> uapi/linux/ethtool.h | 3 +++
> 4 files changed, 20 insertions(+), 4 deletions(-)
>
> v2 -> v3:
> - Removed dashes from ll-rs / LL-RS
> - Added missing llrs in .xhelp string
>
> diff --git a/ethtool.8.in b/ethtool.8.in
> index ba85cfe4f413..08cd01419ce0 100644
> --- a/ethtool.8.in
> +++ b/ethtool.8.in
> @@ -420,7 +420,7 @@ ethtool \- query or control network driver and hardware settings
> .B ethtool \-\-set\-fec
> .I devname
> .B encoding
> -.BR auto | off | rs | baser \ [...]
> +.BR auto | off | rs | baser | llrs \ [...]
> .HP
> .B ethtool \-Q|\-\-per\-queue
> .I devname
> @@ -1228,7 +1228,7 @@ 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
> -.BR encoding\ auto | off | rs | baser \ [...]
> +.BR encoding\ auto | off | rs | baser | llrs \ [...]
>
> Sets the FEC encoding for the device. Combinations of options are specified as
> e.g.
> @@ -1241,6 +1241,7 @@ auto Use the driver's default encoding
> off Turn off FEC
> RS Force RS-FEC encoding
> BaseR Force BaseR encoding
> +LLRS Force LLRS-FEC encoding
> .TE
> .RE
> .TP
> diff --git a/ethtool.c b/ethtool.c
> index 1b4e08b6e60f..854d2aa4e501 100644
> --- a/ethtool.c
> +++ b/ethtool.c
> @@ -502,6 +502,7 @@ static void init_global_link_mode_masks(void)
> ETHTOOL_LINK_MODE_FEC_NONE_BIT,
> ETHTOOL_LINK_MODE_FEC_RS_BIT,
> ETHTOOL_LINK_MODE_FEC_BASER_BIT,
> + ETHTOOL_LINK_MODE_FEC_LLRS_BIT,
> };
> unsigned int i;
>
> @@ -754,6 +755,12 @@ static void dump_link_caps(const char *prefix, const char *an_prefix,
> fprintf(stdout, " RS");
> fecreported = 1;
> }
> + if (ethtool_link_mode_test_bit(ETHTOOL_LINK_MODE_FEC_LLRS_BIT,
> + mask)) {
> + fprintf(stdout, " LLRS");
> + fecreported = 1;
> + }
> +
> if (!fecreported)
> fprintf(stdout, " Not reported");
> fprintf(stdout, "\n");
> @@ -1562,6 +1569,8 @@ static void dump_fec(u32 fec)
> fprintf(stdout, " BaseR");
> if (fec & ETHTOOL_FEC_RS)
> fprintf(stdout, " RS");
> + if (fec & ETHTOOL_FEC_LLRS)
> + fprintf(stdout, " LLRS");
> }
>
> #define N_SOTS 7
> @@ -5074,7 +5083,8 @@ static int fecmode_str_to_type(const char *str)
> return ETHTOOL_FEC_RS;
> if (!strcasecmp(str, "baser"))
> return ETHTOOL_FEC_BASER;
> -
> + if (!strcasecmp(str, "llrs"))
> + return ETHTOOL_FEC_LLRS;
> return 0;
> }
>
> @@ -5486,7 +5496,7 @@ static const struct option args[] = {
> .opts = "--set-fec",
> .func = do_sfec,
> .help = "Set FEC settings",
> - .xhelp = " [ encoding auto|off|rs|baser [...]]\n"
> + .xhelp = " [ encoding auto|off|rs|baser|llrs [...]]\n"
> },
> {
> .opts = "-Q|--per-queue",
> diff --git a/netlink/settings.c b/netlink/settings.c
> index c8a911d718b9..da821726e1b0 100644
> --- a/netlink/settings.c
> +++ b/netlink/settings.c
> @@ -207,6 +207,8 @@ static const struct link_mode_info link_modes[] = {
> { LM_CLASS_REAL, 400000, DUPLEX_FULL },
> [ETHTOOL_LINK_MODE_400000baseCR8_Full_BIT] =
> { LM_CLASS_REAL, 400000, DUPLEX_FULL },
> + [ETHTOOL_LINK_MODE_FEC_LLRS_BIT] =
> + { LM_CLASS_FEC },
> };
> const unsigned int link_modes_count = ARRAY_SIZE(link_modes);
>
> diff --git a/uapi/linux/ethtool.h b/uapi/linux/ethtool.h
> index 16198061d723..d3dcb459195c 100644
> --- a/uapi/linux/ethtool.h
> +++ b/uapi/linux/ethtool.h
> @@ -1328,6 +1328,7 @@ enum ethtool_fec_config_bits {
> ETHTOOL_FEC_OFF_BIT,
> ETHTOOL_FEC_RS_BIT,
> ETHTOOL_FEC_BASER_BIT,
> + ETHTOOL_FEC_LLRS_BIT,
> };
>
> #define ETHTOOL_FEC_NONE (1 << ETHTOOL_FEC_NONE_BIT)
> @@ -1335,6 +1336,7 @@ enum ethtool_fec_config_bits {
> #define ETHTOOL_FEC_OFF (1 << ETHTOOL_FEC_OFF_BIT)
> #define ETHTOOL_FEC_RS (1 << ETHTOOL_FEC_RS_BIT)
> #define ETHTOOL_FEC_BASER (1 << ETHTOOL_FEC_BASER_BIT)
> +#define ETHTOOL_FEC_LLRS (1 << ETHTOOL_FEC_LLRS_BIT)
>
> /* CMDs currently supported */
> #define ETHTOOL_GSET 0x00000001 /* DEPRECATED, Get settings.
> @@ -1519,6 +1521,7 @@ enum ethtool_link_mode_bit_indices {
> ETHTOOL_LINK_MODE_400000baseLR8_ER8_FR8_Full_BIT = 71,
> ETHTOOL_LINK_MODE_400000baseDR8_Full_BIT = 72,
> ETHTOOL_LINK_MODE_400000baseCR8_Full_BIT = 73,
> + ETHTOOL_LINK_MODE_FEC_LLRS_BIT = 74,
>
> /* must be last entry */
> __ETHTOOL_LINK_MODE_MASK_NBITS
> --
> 2.19.1
>
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