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Date: Tue, 15 Mar 2016 16:42:23 -0700
From: David Decotigny <ddecotig@...il.com>
To: Ben Hutchings <ben@...adent.org.uk>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Jeff Garzik <jgarzik@...ox.com>,
David Miller <davem@...hat.com>,
Vidya Sagar Ravipati <vidya@...ulusnetworks.com>,
Joe Perches <joe@...ches.com>
Subject: Re: [ethtool PATCH v4 10/11] ethtool.c: add support for
ETHTOOL_xLINKSETTINGS ioctls
Just sent v5 of the series: now only this patch left. Applied all your
suggestions.
Many thanks for the 2 bugs you caught, path was not covered by my
tests. v5 was tested on a 10G nic with: ethtool -s eth1 msglvl 0x15
speed 10000 duplex full
On Sun, Mar 13, 2016 at 6:32 PM, Ben Hutchings <ben@...adent.org.uk> wrote:
> On Fri, 2016-03-11 at 09:58 -0800, David Decotigny wrote:
> [...]
>> +static int parse_hex_u32_bitmap(const char *s,
>> + unsigned int nbits, u32 *result)
>> +{
>> + const unsigned nwords = __KERNEL_DIV_ROUND_UP(nbits, 32);
>> + size_t slen = strlen(s);
>> + size_t i;
>> +
>> + /* ignore optional '0x' prefix */
>> + if ((slen > 2) && (
>> + (0 == memcmp(s, "0x", 2)
>> + || (0 == memcmp(s, "0X", 2))))) {
>
> memcmp() is a really poor tool for comparing strings. You should use
> strncasecmp() here.
done.
>
>> + slen -= 2;
>> + s += 2;
>> + }
>> +
>> + if (slen > 8*nwords) /* up to 2 digits per byte */
>
> The '*' operator should have spaces around it. Please run
> checkpatch.pl over your ethtool patches to catch style errors like this
> (there are many others in this one).
both done. a few new lines over 80 chars that I prefer to keep,
otherwise line break would make code harder to read imho.
>
> [...]
>> +static void dump_link_caps(const char *prefix, const char *an_prefix,
>> + const u32 *mask, int link_mode_only)
>> {
>> static const struct {
>> int same_line; /* print on same line as previous */
>> - u32 value;
>> + unsigned bit_indice;
>
> bit_index
done.
>
> [...]
>> @@ -558,51 +655,57 @@ dump_link_caps(const char *prefix, const char *an_prefix, u32 mask,
>> }
>> }
>> if (did1 == 0)
>> - fprintf(stdout, "Not reported");
>> + fprintf(stdout, "Not reported");
>
> Good catch, but whitespace fixes belong in another patch.
removed for now.
>
> [...]
>
>> @@ -2248,10 +2360,219 @@ static int do_sfeatures(struct cmd_context *ctx)
>> return 0;
>> }
>>
>> -static int do_gset(struct cmd_context *ctx)
>> +static struct ethtool_link_usettings *
>> +__do_ioctl_glinksettings(struct cmd_context * ctx)
>> +{
>> + int err;
>> + struct {
>> + struct ethtool_link_settings req;
>> + __u32 link_mode_data[3*__ETHTOOL_LINK_MODE_MASK_MAX_KERNEL_NU32];
>> + } ecmd;
>> + struct ethtool_link_usettings *link_usettings;
>> + unsigned u32_offs;
>> +
>> + /* handshake with kernel to determine number of words for link
>> + * mode bitmaps */
>> + memset(&ecmd, 0, sizeof(ecmd));
>> + ecmd.req.cmd = ETHTOOL_GLINKSETTINGS;
>> + err = send_ioctl(ctx, &ecmd);
>> + if (err < 0)
>> + return NULL;
>> +
>> + if (ecmd.req.link_mode_masks_nwords >= 0 || ecmd.req.cmd)
>> + return NULL;
>
> Oops, I missed the kernel side of this. Clearing the cmd field is a
> very strange thing to do and inconsistent with every other ethtool
> command, so I've just sent a patch to change the kernel side of that.
> You'll need to change this to match.
>
> (I also think the negative size is a bit weird, but don't feel so
> strongly about it.)
updated based on your patch. sent a suggestion
http://marc.info/?l=linux-netdev&m=145806871332416 , looks like it was
not added properly to the thread, because I don't see it as a reply to
your patch in patchwork. sorry about this.
>
> [...]
>> + link_usettings = malloc(sizeof(*link_usettings));
>> + if (NULL == link_usettings)
>
> Comparison is the wrong way round.
done.
>
>> + return NULL;
>> +
>> + memset(link_usettings, 0, sizeof(*link_usettings));
>
> Could use calloc() instead of malloc() + memset().
done.
>
>> + /* keep transceiver 0 */
>> + memcpy(&link_usettings->base, &ecmd.req, sizeof(link_usettings->base));
>> + /* remember that ETHTOOL_GLINKSETTINGS was used */
>> + link_usettings->base.cmd = ETHTOOL_GLINKSETTINGS;
>
> This is redundant as we know that ecmd.req.cmd ==
> ETHTOOL_GLINKSETTINGS.
done.
>
> [...]
>> +static struct ethtool_link_usettings *
>> +__do_ioctl_gset(struct cmd_context * ctx)
>> {
> [...]
>> + link_usettings->base.link_mode_masks_nwords = 1;
>> + link_usettings->link_modes.supported[0] = ecmd.supported;
>> + link_usettings->link_modes.advertising[0] = ecmd.advertising;
>> + link_usettings->link_modes.lp_advertising[0] = ecmd.lp_advertising;
>> + link_usettings->base.speed = ethtool_cmd_speed(&ecmd);
>> + link_usettings->base.duplex = ecmd.duplex;
>> + link_usettings->base.port = ecmd.port;
>> + link_usettings->base.phy_address = ecmd.phy_address;
>> + link_usettings->deprecated.transceiver = ecmd.transceiver;
>> + link_usettings->base.autoneg = ecmd.autoneg;
>> + link_usettings->base.mdio_support = ecmd.mdio_support;
>> + /* ignored (fully deprecated): maxrxpkt, maxtxpkt */
>> + link_usettings->base.eth_tp_mdix = ecmd.eth_tp_mdix;
>> + link_usettings->base.eth_tp_mdix_ctrl = ecmd.eth_tp_mdix_ctrl;
>> + link_usettings->deprecated.transceiver = ecmd.transceiver;
>
> Duplicate assignment.
done.
>
>> + return link_usettings;
>> +}
>> +
>> +static bool ethtool_link_mode_is_backward_compatible(
>> + const u32 *mask)
>
> Don't wrap function parameter lists or statements that are already
> under 80 characters.
done.
>
> [...]
>> +static void
>> +__free_link_usettings(struct ethtool_link_usettings *link_usettings) {
>> + free(link_usettings);
>> +}
>
> Is this function ever likely to do more than just free()? If not,
> don't bother abstracting that.
free() is likely to stay good enough. updated.
>
> [...]
>> @@ -2469,75 +2799,88 @@ static int do_sset(struct cmd_context *ctx)
>> }
>> }
>>
>> - if (full_advertising_wanted < 0) {
>> + if (NULL == full_advertising_wanted) {
>> /* User didn't supply a full advertisement bitfield:
>> * construct one from the specified speed and duplex.
>> */
>> + int adv_bit = -1;
>> +
>> if (speed_wanted == SPEED_10 && duplex_wanted == DUPLEX_HALF)
>> - advertising_wanted = ADVERTISED_10baseT_Half;
>> + adv_bit = ETHTOOL_LINK_MODE_10baseT_Half_BIT;
>> else if (speed_wanted == SPEED_10 &&
>> duplex_wanted == DUPLEX_FULL)
>> - advertising_wanted = ADVERTISED_10baseT_Full;
>> + adv_bit = ETHTOOL_LINK_MODE_10baseT_Full_BIT;
>> else if (speed_wanted == SPEED_100 &&
>> duplex_wanted == DUPLEX_HALF)
>> - advertising_wanted = ADVERTISED_100baseT_Half;
>> + adv_bit = ETHTOOL_LINK_MODE_100baseT_Half_BIT;
>> else if (speed_wanted == SPEED_100 &&
>> duplex_wanted == DUPLEX_FULL)
>> - advertising_wanted = ADVERTISED_100baseT_Full;
>> + adv_bit = ETHTOOL_LINK_MODE_100baseT_Full_BIT;
>> else if (speed_wanted == SPEED_1000 &&
>> duplex_wanted == DUPLEX_HALF)
>> - advertising_wanted = ADVERTISED_1000baseT_Half;
>> + adv_bit = ETHTOOL_LINK_MODE_1000baseT_Half_BIT;
>> else if (speed_wanted == SPEED_1000 &&
>> duplex_wanted == DUPLEX_FULL)
>> - advertising_wanted = ADVERTISED_1000baseT_Full;
>> + adv_bit = ETHTOOL_LINK_MODE_1000baseT_Full_BIT;
>> else if (speed_wanted == SPEED_2500 &&
>> duplex_wanted == DUPLEX_FULL)
>> - advertising_wanted = ADVERTISED_2500baseX_Full;
>> + adv_bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT;
>> else if (speed_wanted == SPEED_10000 &&
>> duplex_wanted == DUPLEX_FULL)
>> - advertising_wanted = ADVERTISED_10000baseT_Full;
>> - else
>> - /* auto negotiate without forcing,
>> - * all supported speed will be assigned below
>> - */
>> - advertising_wanted = 0;
>> + adv_bit = ETHTOOL_LINK_MODE_10000baseT_Full_BIT;
>> +
>> + if (adv_bit >= 0) {
>> + advertising_wanted = _mask_advertising_wanted;
>
> If I'm not mistaken, _mask_advertising_wanted is uninitialised at this
> point so you need to clear it before setting the one bit.
great catch! thanks.
>
>> + ethtool_link_mode_set_bit(
>> + adv_bit, advertising_wanted);
> [...]
>> @@ -2549,37 +2892,56 @@ static int do_sset(struct cmd_context *ctx)
>> fprintf(stderr, "\n");
>> }
>> if (autoneg_wanted == AUTONEG_ENABLE &&
>> - advertising_wanted == 0) {
>> + NULL == advertising_wanted) {
>> + unsigned int i;
>> +
>> /* Auto negotiation enabled, but with
>> * unspecified speed and duplex: enable all
>> * supported speeds and duplexes.
>> */
>> - ecmd.advertising =
>> - (ecmd.advertising &
>> - ~ALL_ADVERTISED_MODES) |
>> - (ALL_ADVERTISED_MODES & ecmd.supported);
>> + ethtool_link_mode_for_each_u32(i)
>> + {
>
> Brace belongs on the previous line (everywhere you use
> ethtool_link_mode_for_each_u32()).
done.
>
> [...]
>> - } else if (advertising_wanted > 0) {
>> + } else if (NULL != advertising_wanted) {
>> + unsigned int i;
>> +
>> /* Enable all requested modes */
>> - ecmd.advertising =
>> - (ecmd.advertising &
>> - ~ALL_ADVERTISED_MODES) |
>> - advertising_wanted;
>> - } else if (full_advertising_wanted > 0) {
>> - ecmd.advertising = full_advertising_wanted;
>> + ethtool_link_mode_for_each_u32(i)
>> + {
>> + u32 *adv = link_usettings->link_modes.advertising + i;
>> + *adv = ((*adv & all_advertised_modes[i])
> [...]
>
> Should be ~all_advertised_modes[i] rather than all_advertised_modes[i].
aouch! thanks.
>
> Ben.
>
> --
> Ben Hutchings
> If at first you don't succeed, you're doing about average.
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