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Date: Fri, 16 Dec 2011 11:19:27 -0800
From: "Matt Carlson" <mcarlson@...adcom.com>
To: "Ben Hutchings" <bhutchings@...arflare.com>
cc: "Matthew Carlson" <mcarlson@...adcom.com>,
"davem@...emloft.net" <davem@...emloft.net>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"Michael Chan" <mchan@...adcom.com>
Subject: Re: [PATCH] tg3: Make the RSS indir tbl admin configurable
On Thu, Dec 15, 2011 at 07:04:34PM -0800, Ben Hutchings wrote:
> On Thu, 2011-12-15 at 16:47 -0800, Matt Carlson wrote:
> > This patch adds the ethtool callbacks necessary to change the rss
> > indirection table from userspace. When setting the indirection table
> > through set_rxfh_indir, an indirection table size of zero is
> > interpreted to mean that the admin wants to relinquish control of the
> > table to the driver. Should the number of interrupts change (e.g.
> > across a close / open call, or through a reset), any indirection table
> > values that exceed the number of RSS queues or interrupt vectors will
> > be automatically scaled back to values within range.
> >
> > Signed-off-by: Matt Carlson <mcarlson@...adcom.com>
> > Signed-off-by: Michael Chan <mchan@...adcom.com>
> > Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
>
> No I didn't!
>
> Ben.
Sorry. This part of procedure I'm unsure about. I didn't want to lose
the ack of your contributions to this patch. The SOB does imply that
you are O.K. with it as-is though, which you may or may not be aligned
with. I apologize if I was putting words in your mouth.
What should I have done instead? Would Dave put the SOB on your behalf
as he accepts it?
> > Reviewed-by: Benjamin Li <benli@...adcom.com>
> > ---
> > drivers/net/ethernet/broadcom/tg3.c | 126 ++++++++++++++++++++++++++++++++++-
> > drivers/net/ethernet/broadcom/tg3.h | 1 +
> > 2 files changed, 126 insertions(+), 1 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
> > index 8bf11ca..87f70f6 100644
> > --- a/drivers/net/ethernet/broadcom/tg3.c
> > +++ b/drivers/net/ethernet/broadcom/tg3.c
> > @@ -8229,9 +8229,19 @@ void tg3_rss_init_indir_tbl(struct tg3 *tp)
> >
> > if (tp->irq_cnt <= 2)
> > memset(&tp->rss_ind_tbl[0], 0, sizeof(tp->rss_ind_tbl));
> > - else
> > + else if (tg3_flag(tp, USER_INDIR_TBL)) {
> > + /* Validate table against current IRQ count */
> > + for (i = 0; i < TG3_RSS_INDIR_TBL_SIZE; i++) {
> > + if (tp->rss_ind_tbl[i] >= tp->irq_cnt - 1) {
> > + /* Bring the index within range */
> > + tp->rss_ind_tbl[i] = tp->rss_ind_tbl[i] %
> > + (tp->irq_cnt - 1);
> > + }
> > + }
> > + } else {
> > for (i = 0; i < TG3_RSS_INDIR_TBL_SIZE; i++)
> > tp->rss_ind_tbl[i] = i % (tp->irq_cnt - 1);
> > + }
> > }
> >
> > void tg3_rss_write_indir_tbl(struct tg3 *tp)
> > @@ -10719,6 +10729,117 @@ static int tg3_get_sset_count(struct net_device *dev, int sset)
> > }
> > }
> >
> > +static int tg3_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
> > + u32 *rules __always_unused)
> > +{
> > + struct tg3 *tp = netdev_priv(dev);
> > +
> > + if (!tg3_flag(tp, SUPPORT_MSIX))
> > + return -EOPNOTSUPP;
> > +
> > + switch (info->cmd) {
> > + case ETHTOOL_GRXRINGS:
> > + if (netif_running(tp->dev))
> > + info->data = tp->irq_cnt;
> > + else {
> > + info->data = num_online_cpus();
> > + if (info->data > TG3_IRQ_MAX_VECS_RSS)
> > + info->data = TG3_IRQ_MAX_VECS_RSS;
> > + }
> > +
> > + /* The first interrupt vector only
> > + * handles link interrupts.
> > + */
> > + info->data -= 1;
> > + return 0;
> > +
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static int tg3_get_rxfh_indir(struct net_device *dev,
> > + struct ethtool_rxfh_indir *indir)
> > +{
> > + struct tg3 *tp = netdev_priv(dev);
> > + int i;
> > +
> > + if (!tg3_flag(tp, SUPPORT_MSIX))
> > + return -EOPNOTSUPP;
> > +
> > + if (!indir->size) {
> > + indir->size = TG3_RSS_INDIR_TBL_SIZE;
> > + return 0;
> > + }
> > +
> > + if (indir->size != TG3_RSS_INDIR_TBL_SIZE)
> > + return -EINVAL;
> > +
> > + for (i = 0; i < TG3_RSS_INDIR_TBL_SIZE; i++)
> > + indir->ring_index[i] = tp->rss_ind_tbl[i];
> > +
> > + return 0;
> > +}
> > +
> > +static int tg3_set_rxfh_indir(struct net_device *dev,
> > + const struct ethtool_rxfh_indir *indir)
> > +{
> > + struct tg3 *tp = netdev_priv(dev);
> > + size_t i;
> > +
> > + if (!tg3_flag(tp, SUPPORT_MSIX))
> > + return -EOPNOTSUPP;
> > +
> > + if (!indir->size) {
> > + tg3_flag_clear(tp, USER_INDIR_TBL);
> > + tg3_rss_init_indir_tbl(tp);
> > + } else {
> > + int limit;
> > +
> > + /* Validate size and indices */
> > + if (indir->size != TG3_RSS_INDIR_TBL_SIZE)
> > + return -EINVAL;
> > +
> > + if (netif_running(dev))
> > + limit = tp->irq_cnt;
> > + else {
> > + limit = num_online_cpus();
> > + if (limit > TG3_IRQ_MAX_VECS_RSS)
> > + limit = TG3_IRQ_MAX_VECS_RSS;
> > + }
> > +
> > + /* The first interrupt vector only
> > + * handles link interrupts.
> > + */
> > + limit -= 1;
> > +
> > + /* Check the indices in the table.
> > + * Leave the existing table unmodified
> > + * if an error is detected.
> > + */
> > + for (i = 0; i < TG3_RSS_INDIR_TBL_SIZE; i++)
> > + if (indir->ring_index[i] >= limit)
> > + return -EINVAL;
> > +
> > + tg3_flag_set(tp, USER_INDIR_TBL);
> > +
> > + for (i = 0; i < TG3_RSS_INDIR_TBL_SIZE; i++)
> > + tp->rss_ind_tbl[i] = indir->ring_index[i];
> > + }
> > +
> > + if (!netif_running(dev) || !tg3_flag(tp, ENABLE_RSS))
> > + return 0;
> > +
> > + /* It is legal to write the indirection
> > + * table while the device is running.
> > + */
> > + tg3_full_lock(tp, 0);
> > + tg3_rss_write_indir_tbl(tp);
> > + tg3_full_unlock(tp);
> > +
> > + return 0;
> > +}
> > +
> > static void tg3_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
> > {
> > switch (stringset) {
> > @@ -11949,6 +12070,9 @@ static const struct ethtool_ops tg3_ethtool_ops = {
> > .get_coalesce = tg3_get_coalesce,
> > .set_coalesce = tg3_set_coalesce,
> > .get_sset_count = tg3_get_sset_count,
> > + .get_rxnfc = tg3_get_rxnfc,
> > + .get_rxfh_indir = tg3_get_rxfh_indir,
> > + .set_rxfh_indir = tg3_set_rxfh_indir,
> > };
> >
> > static void __devinit tg3_get_eeprom_size(struct tg3 *tp)
> > diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
> > index aea8f72..4800595 100644
> > --- a/drivers/net/ethernet/broadcom/tg3.h
> > +++ b/drivers/net/ethernet/broadcom/tg3.h
> > @@ -2932,6 +2932,7 @@ enum TG3_FLAGS {
> > TG3_FLAG_APE_HAS_NCSI,
> > TG3_FLAG_4K_FIFO_LIMIT,
> > TG3_FLAG_RESET_TASK_PENDING,
> > + TG3_FLAG_USER_INDIR_TBL,
> > TG3_FLAG_5705_PLUS,
> > TG3_FLAG_IS_5788,
> > TG3_FLAG_5750_PLUS,
>
> --
> Ben Hutchings, Staff Engineer, Solarflare
> Not speaking for my employer; that's the marketing department's job.
> They asked us to note that Solarflare product names are trademarked.
>
>
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