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Date: Wed, 05 Nov 2014 21:51:38 +0000
From: Ben Hutchings <ben@...adent.org.uk>
To: Amir Vadai <amirv@...lanox.com>
Cc: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
Or Gerlitz <ogerlitz@...lanox.com>,
Eyal Perry <eyalpe@...lanox.com>,
Yevgeny Petrilin <yevgenyp@...lanox.com>
Subject: Re: [PATCH net-next 1/2] ethtool: Support for configurable RSS hash
function
On Wed, 2014-11-05 at 13:59 +0200, Amir Vadai wrote:
> From: Eyal Perry <eyalpe@...lanox.com>
>
> This patch adds an RSS hash functions string-set, and two
> ethtool-options for set/get current RSS hash function. User-kernel API is done
> through the new hfunc mask field in the ethtool_rxfh struct. A bit set
> in the hfunc is corresponding to an index in the string-set.
>
> Signed-off-by: Eyal Perry <eyalpe@...lanox.com>
> Signed-off-by: Amir Vadai <amirv@...lanox.com>
> ---
> include/linux/ethtool.h | 28 ++++++++++++++++++++++++
> include/uapi/linux/ethtool.h | 6 ++++-
> net/core/ethtool.c | 52 ++++++++++++++++++++++++++++++--------------
> 3 files changed, 69 insertions(+), 17 deletions(-)
>
> diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
> index c1a2d60..61003b1 100644
> --- a/include/linux/ethtool.h
> +++ b/include/linux/ethtool.h
> @@ -59,6 +59,29 @@ enum ethtool_phys_id_state {
> ETHTOOL_ID_OFF
> };
>
> +enum {
> + RSS_HASH_TOP_BIT, /* Configurable RSS hash function - Toeplitz */
> + RSS_HASH_XOR_BIT, /* Configurable RSS hash function - Xor */
> +
> + /*
> + * Add your fresh new hash function bits above and remember to update
> + * rss_hash_func_strings[] below
> + */
> + RSS_HASH_FUNCS_COUNT
> +};
> +
> +#define __RSS_HASH_BIT(bit) ((u32)1 << (bit))
> +#define __RSS_HASH(name) __RSS_HASH_BIT(RSS_HASH_##name##_BIT)
> +
> +#define RSS_HASH_TOP __RSS_HASH(TOP)
> +#define RSS_HASH_XOR __RSS_HASH(XOR)
I think #define RSS_HASH_UNKNOWN 0 might also be useful.
And I think all of these names should get an ETH_ prefix.
> +static const char
> +rss_hash_func_strings[RSS_HASH_FUNCS_COUNT][ETH_GSTRING_LEN] = {
> + [RSS_HASH_TOP_BIT] = "toeplitz",
> + [RSS_HASH_XOR_BIT] = "xor",
> +};
This belongs in net/core/ethtool.c.
> struct net_device;
>
> /* Some generic methods drivers may use in their ethtool_ops */
> @@ -158,6 +181,9 @@ static inline u32 ethtool_rxfh_indir_default(u32 index, u32 n_rx_rings)
> * Returns zero if not supported for this specific device.
> * @get_rxfh_indir_size: Get the size of the RX flow hash indirection table.
> * Returns zero if not supported for this specific device.
> + * @get_rxfh_func: Get the hardware RX flow hash function.
> + * @set_rxfh_func: Set the hardware RX flow hash function. Returns a negative
> + * error code or zero.
> * @get_rxfh: Get the contents of the RX flow hash indirection table and hash
> * key.
> * Will only be called if one or both of @get_rxfh_indir_size and
> @@ -241,6 +267,8 @@ struct ethtool_ops {
> int (*reset)(struct net_device *, u32 *);
> u32 (*get_rxfh_key_size)(struct net_device *);
> u32 (*get_rxfh_indir_size)(struct net_device *);
> + u32 (*get_rxfh_func)(struct net_device *);
> + int (*set_rxfh_func)(struct net_device *, u32);
Why not another parameter to get_rxfh/set_rxfh? I know it's a pain to
update all the implementations, but changing algorithm potentially
changes the supported indirection table and key lengths. They have to
be validated together.
> int (*get_rxfh)(struct net_device *, u32 *indir, u8 *key);
> int (*set_rxfh)(struct net_device *, const u32 *indir,
> const u8 *key);
> diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
> index eb2095b..eb91da4 100644
> --- a/include/uapi/linux/ethtool.h
> +++ b/include/uapi/linux/ethtool.h
> @@ -534,6 +534,7 @@ struct ethtool_pauseparam {
> * @ETH_SS_NTUPLE_FILTERS: Previously used with %ETHTOOL_GRXNTUPLE;
> * now deprecated
> * @ETH_SS_FEATURES: Device feature names
> + * @ETH_SS_RSS_HASH_FUNCS: RSS hush function names
> */
> enum ethtool_stringset {
> ETH_SS_TEST = 0,
> @@ -541,6 +542,7 @@ enum ethtool_stringset {
> ETH_SS_PRIV_FLAGS,
> ETH_SS_NTUPLE_FILTERS,
> ETH_SS_FEATURES,
> + ETH_SS_RSS_HASH_FUNCS,
> };
>
> /**
> @@ -900,7 +902,9 @@ struct ethtool_rxfh {
> __u32 rss_context;
> __u32 indir_size;
> __u32 key_size;
> - __u32 rsvd[2];
> + __u8 hfunc;
Missing kernel-doc. This needs to be very clear about what the valid
values are.
> + __u8 rsvd8[3];
> + __u32 rsvd32;
> __u32 rss_config[0];
> };
> #define ETH_RXFH_INDIR_NO_CHANGE 0xffffffff
> diff --git a/net/core/ethtool.c b/net/core/ethtool.c
> index 06dfb29..4791c17 100644
> --- a/net/core/ethtool.c
> +++ b/net/core/ethtool.c
> @@ -185,6 +185,9 @@ static int __ethtool_get_sset_count(struct net_device *dev, int sset)
> if (sset == ETH_SS_FEATURES)
> return ARRAY_SIZE(netdev_features_strings);
>
> + if (sset == ETH_SS_RSS_HASH_FUNCS)
> + return ARRAY_SIZE(rss_hash_func_strings);
> +
> if (ops->get_sset_count && ops->get_strings)
> return ops->get_sset_count(dev, sset);
> else
[...]
> @@ -760,32 +769,43 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
> const struct ethtool_ops *ops = dev->ethtool_ops;
> struct ethtool_rxnfc rx_rings;
> struct ethtool_rxfh rxfh;
> - u32 dev_indir_size = 0, dev_key_size = 0, i;
> + u32 dev_indir_size = 0, dev_key_size = 0, dev_hfunc = 0, i;
> u32 *indir = NULL, indir_bytes = 0;
> u8 *hkey = NULL;
> u8 *rss_config;
> u32 rss_cfg_offset = offsetof(struct ethtool_rxfh, rss_config[0]);
>
> - if (!(ops->get_rxfh_indir_size || ops->get_rxfh_key_size) ||
> - !ops->get_rxnfc || !ops->set_rxfh)
> + if (!(ops->get_rxfh_indir_size || ops->get_rxfh_key_size ||
> + ops->get_rxfh_func) || !ops->get_rxnfc || !ops->set_rxfh)
> return -EOPNOTSUPP;
>
> + if (ops->get_rxfh_func)
> + dev_hfunc = ops->get_rxfh_func(dev);
> if (ops->get_rxfh_indir_size)
> dev_indir_size = ops->get_rxfh_indir_size(dev);
> if (ops->get_rxfh_key_size)
> dev_key_size = dev->ethtool_ops->get_rxfh_key_size(dev);
> - if ((dev_key_size + dev_indir_size) == 0)
> + if ((dev_key_size + dev_indir_size + dev_hfunc) == 0)
> return -EOPNOTSUPP;
>
> if (copy_from_user(&rxfh, useraddr, sizeof(rxfh)))
> return -EFAULT;
>
> /* Check that reserved fields are 0 for now */
> - if (rxfh.rss_context || rxfh.rsvd[0] || rxfh.rsvd[1])
> + if (rxfh.rss_context || rxfh.rsvd8[0] || rxfh.rsvd8[1] ||
> + rxfh.rsvd8[2] || rxfh.rsvd32)
> return -EINVAL;
>
> + if (rxfh.hfunc != dev_hfunc) {
> + if (!ops->set_rxfh_func)
> + return -EOPNOTSUPP;
> + ret = ops->set_rxfh_func(dev, rxfh.hfunc);
> + if (ret)
> + return ret;
> + }
> +
> /* If either indir or hash key is valid, proceed further.
> - * It is not valid to request that both be unchanged.
> + * Must request at least one change: indir size, hash key or function.
> */
> if ((rxfh.indir_size &&
> rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE &&
> @@ -793,7 +813,7 @@ static noinline_for_stack int ethtool_set_rxfh(struct net_device *dev,
> (rxfh.key_size && (rxfh.key_size != dev_key_size)) ||
> (rxfh.indir_size == ETH_RXFH_INDIR_NO_CHANGE &&
> rxfh.key_size == 0))
> - return -EINVAL;
> + return rxfh.hfunc ? 0 : -EINVAL;
Shouldn't the condition be rxfh.hfunc != dev_hfunc ?
Ben.
> if (rxfh.indir_size != ETH_RXFH_INDIR_NO_CHANGE)
> indir_bytes = dev_indir_size * sizeof(indir[0]);
--
Ben Hutchings
The program is absolutely right; therefore, the computer must be wrong.
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