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Subject[PATCH 5.4 35/37] ionic: keep users rss hash across lif reset
Date
From: Shannon Nelson <snelson@pensando.io>

[ Upstream commit ffac2027e18f006f42630f2e01a8a9bd8dc664b5 ]

If the user has specified their own RSS hash key, don't
lose it across queue resets such as DOWN/UP, MTU change,
and number of channels change. This is fixed by moving
the key initialization to a little earlier in the lif
creation.

Also, let's clean up the RSS config a little better on
the way down by setting it all to 0.

Fixes: aa3198819bea ("ionic: Add RSS support")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/pensando/ionic/ionic_lif.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)

--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -1364,12 +1364,9 @@ int ionic_lif_rss_config(struct ionic_li

static int ionic_lif_rss_init(struct ionic_lif *lif)
{
- u8 rss_key[IONIC_RSS_HASH_KEY_SIZE];
unsigned int tbl_sz;
unsigned int i;

- netdev_rss_key_fill(rss_key, IONIC_RSS_HASH_KEY_SIZE);
-
lif->rss_types = IONIC_RSS_TYPE_IPV4 |
IONIC_RSS_TYPE_IPV4_TCP |
IONIC_RSS_TYPE_IPV4_UDP |
@@ -1382,12 +1379,18 @@ static int ionic_lif_rss_init(struct ion
for (i = 0; i < tbl_sz; i++)
lif->rss_ind_tbl[i] = ethtool_rxfh_indir_default(i, lif->nxqs);

- return ionic_lif_rss_config(lif, lif->rss_types, rss_key, NULL);
+ return ionic_lif_rss_config(lif, lif->rss_types, NULL, NULL);
}

-static int ionic_lif_rss_deinit(struct ionic_lif *lif)
+static void ionic_lif_rss_deinit(struct ionic_lif *lif)
{
- return ionic_lif_rss_config(lif, 0x0, NULL, NULL);
+ int tbl_sz;
+
+ tbl_sz = le16_to_cpu(lif->ionic->ident.lif.eth.rss_ind_tbl_sz);
+ memset(lif->rss_ind_tbl, 0, tbl_sz);
+ memset(lif->rss_hash_key, 0, IONIC_RSS_HASH_KEY_SIZE);
+
+ ionic_lif_rss_config(lif, 0x0, NULL, NULL);
}

static void ionic_txrx_disable(struct ionic_lif *lif)
@@ -1710,6 +1713,7 @@ static struct ionic_lif *ionic_lif_alloc
dev_err(dev, "Failed to allocate rss indirection table, aborting\n");
goto err_out_free_qcqs;
}
+ netdev_rss_key_fill(lif->rss_hash_key, IONIC_RSS_HASH_KEY_SIZE);

list_add_tail(&lif->list, &ionic->lifs);


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