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eth: fbnic: support setting RSS configuration

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Let the user program the RSS indirection table and the RSS key.
Straightforward implementation. Track the changes and don't bother
poking the HW if user asked for a config identical to what's already
programmed. The device only supports Toeplitz hash.

Similarly to the GET support - all the real code that does the programming
was part of initial driver submission, already.

Signed-off-by: Alexander Duyck <alexanderduyck@fb.com>
Link: https://patch.msgid.link/20241220025241.1522781-5-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Alexander Duyck 2024-12-19 18:52:35 -08:00 committed by Jakub Kicinski
parent ef1c28817b
commit 31ab733e99
1 changed files with 55 additions and 0 deletions
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55
drivers/net/ethernet/meta/fbnic/fbnic_ethtool.c
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@ -201,6 +201,60 @@ fbnic_get_rxfh(struct net_device *netdev, struct ethtool_rxfh_param *rxfh)
return 0;
}
static unsigned int
fbnic_set_indir(struct fbnic_net *fbn, unsigned int idx, const u32 *indir)
{
unsigned int i, changes = 0;
for (i = 0; i < FBNIC_RPC_RSS_TBL_SIZE; i++) {
if (fbn->indir_tbl[idx][i] == indir[i])
continue;
fbn->indir_tbl[idx][i] = indir[i];
changes++;
}
return changes;
}
static int
fbnic_set_rxfh(struct net_device *netdev, struct ethtool_rxfh_param *rxfh,
struct netlink_ext_ack *extack)
{
struct fbnic_net *fbn = netdev_priv(netdev);
unsigned int i, changes = 0;
if (rxfh->hfunc != ETH_RSS_HASH_NO_CHANGE &&
rxfh->hfunc != ETH_RSS_HASH_TOP)
return -EINVAL;
if (rxfh->key) {
u32 rss_key = 0;
for (i = FBNIC_RPC_RSS_KEY_BYTE_LEN; i--;) {
rss_key >>= 8;
rss_key |= (u32)(rxfh->key[i]) << 24;
if (i % 4)
continue;
if (fbn->rss_key[i / 4] == rss_key)
continue;
fbn->rss_key[i / 4] = rss_key;
changes++;
}
}
if (rxfh->indir)
changes += fbnic_set_indir(fbn, 0, rxfh->indir);
if (changes && netif_running(netdev))
fbnic_rss_reinit_hw(fbn->fbd, fbn);
return 0;
}
static int
fbnic_get_ts_info(struct net_device *netdev,
struct kernel_ethtool_ts_info *tsinfo)
@ -312,6 +366,7 @@ static const struct ethtool_ops fbnic_ethtool_ops = {
.get_rxfh_key_size = fbnic_get_rxfh_key_size,
.get_rxfh_indir_size = fbnic_get_rxfh_indir_size,
.get_rxfh = fbnic_get_rxfh,
.set_rxfh = fbnic_set_rxfh,
.get_ts_info = fbnic_get_ts_info,
.get_ts_stats = fbnic_get_ts_stats,
.get_eth_mac_stats = fbnic_get_eth_mac_stats,