netdev - Re: [ethtool-next PATCH] rings: add support to set/get cqe size

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Date:   Tue, 14 Jun 2022 01:32:34 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Subbaraya Sundeep Bhatta <sbhatta@...vell.com>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        Hariprasad Kelam <hkelam@...vell.com>,
        Geethasowjanya Akula <gakula@...vell.com>
Subject: Re: [ethtool-next PATCH] rings: add support to set/get cqe size

On Mon, Jun 06, 2022 at 10:24:58AM +0000, Subbaraya Sundeep Bhatta wrote:
> Hi Michal Kubecek,
> 
> Any comments?

It's applied now, I just applied it to master before releasing 5.18
because the kernel counterpart is in v5.18.

Michal

> 
> Thanks,
> Sundeep
> 
> ________________________________________
> From: Subbaraya Sundeep <sbhatta@...vell.com>
> Sent: Thursday, May 26, 2022 4:48 PM
> To: mkubecek@...e.cz; davem@...emloft.net; kuba@...nel.org
> Cc: netdev@...r.kernel.org; Sunil Kovvuri Goutham; Hariprasad Kelam; Geethasowjanya Akula; Subbaraya Sundeep Bhatta
> Subject: [ethtool-next PATCH] rings: add support to set/get cqe size
> 
> After a packet is sent or received by NIC then NIC posts
> a completion queue event which consists of transmission status
> (like send success or error) and received status(like
> pointers to packet fragments). These completion events may
> also use a ring similar to rx and tx rings. This patch
> introduces cqe-size ethtool parameter to modify the size
> of the completion queue event if NIC hardware has that capability.
> With this patch in place, cqe size can be set via
> "ethtool -G <dev> cqe-size xxx" and get via "ethtool -g <dev>".
> 
> Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>
> ---
>  ethtool.8.in    | 4 ++++
>  ethtool.c       | 1 +
>  netlink/rings.c | 7 +++++++
>  3 files changed, 12 insertions(+)
> 
> diff --git a/ethtool.8.in b/ethtool.8.in
> index cbfe9cf..92ba229 100644
> --- a/ethtool.8.in
> +++ b/ethtool.8.in
> @@ -200,6 +200,7 @@ ethtool \- query or control network driver and hardware settings
>  .BN tx
>  .BN rx\-buf\-len
>  .BN tx\-push
> +.BN cqe\-size
>  .HP
>  .B ethtool \-i|\-\-driver
>  .I devname
> @@ -577,6 +578,9 @@ Changes the size of a buffer in the Rx ring.
>  .TP
>  .BI tx\-push \ on|off
>  Specifies whether TX push should be enabled.
> +.TP
> +.BI cqe\-size \ N
> +Changes the size of completion queue event.
>  .RE
>  .TP
>  .B \-i \-\-driver
> diff --git a/ethtool.c b/ethtool.c
> index c58c73b..ef4e4c6 100644
> --- a/ethtool.c
> +++ b/ethtool.c
> @@ -5734,6 +5734,7 @@ static const struct option args[] = {
>                           "             [ tx N ]\n"
>                           "             [ rx-buf-len N]\n"
>                           "             [ tx-push on|off]\n"
> +                         "             [ cqe-size N]\n"
>         },
>         {
>                 .opts   = "-k|--show-features|--show-offload",
> diff --git a/netlink/rings.c b/netlink/rings.c
> index 3718c10..5999247 100644
> --- a/netlink/rings.c
> +++ b/netlink/rings.c
> @@ -48,6 +48,7 @@ int rings_reply_cb(const struct nlmsghdr *nlhdr, void *data)
>         show_u32(tb[ETHTOOL_A_RINGS_TX], "TX:\t\t");
>         show_u32(tb[ETHTOOL_A_RINGS_RX_BUF_LEN], "RX Buf Len:\t\t");
>         show_bool("tx-push", "TX Push:\t%s\n", tb[ETHTOOL_A_RINGS_TX_PUSH]);
> +       show_u32(tb[ETHTOOL_A_RINGS_CQE_SIZE], "CQE Size:\t\t");
> 
>         return MNL_CB_OK;
>  }
> @@ -112,6 +113,12 @@ static const struct param_parser sring_params[] = {
>                 .handler        = nl_parse_u8bool,
>                 .min_argc       = 1,
>         },
> +       {
> +               .arg            = "cqe-size",
> +               .type           = ETHTOOL_A_RINGS_CQE_SIZE,
> +               .handler        = nl_parse_direct_u32,
> +               .min_argc       = 1,
> +       },
>         {}
>  };
> 
> --
> 2.7.4
> 

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