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Date: Wed, 14 Dec 2011 13:10:02 -0800
From: "Matt Carlson" <mcarlson@...adcom.com>
To: davem@...emloft.net
cc: netdev@...r.kernel.org, mcarlson@...adcom.com,
"Michael Chan" <mchan@...adcom.com>
Subject: [PATCH net-next 6/6] tg3: Make the RSS indir tbl admin
configurable
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>
Reviewed-by: Benjamin Li <benli@...adcom.com>
---
drivers/net/ethernet/broadcom/tg3.c | 128 ++++++++++++++++++++++++++++++++++-
drivers/net/ethernet/broadcom/tg3.h | 1 +
2 files changed, 128 insertions(+), 1 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 8bf11ca..f684be9 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -8229,9 +8229,18 @@ 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) {
+ /* Cap the vector index */
+ tp->rss_ind_tbl[i] = tp->irq_cnt - 2;
+ }
+ }
+ } 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 +10728,120 @@ 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 -EINVAL;
+
+ if (!netif_running(tp->dev))
+ return -EAGAIN;
+
+ 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 -EINVAL;
+
+ 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 -EINVAL;
+
+ 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 +12072,9 @@ 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,
--
1.7.3.4
--
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