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Date: Fri, 16 Dec 2011 03:04:34 +0000
From: Ben Hutchings <bhutchings@...arflare.com>
To: Matt Carlson <mcarlson@...adcom.com>
CC: <davem@...emloft.net>, <netdev@...r.kernel.org>,
Michael Chan <mchan@...adcom.com>
Subject: Re: [PATCH] tg3: Make the RSS indir tbl admin configurable
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.
> 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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