netdev - [PATCH v2 2/2] octeontx2-pf: Support setting ntuple rule count

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Message-ID: <1627064206-16032-3-git-send-email-sgoutham@marvell.com>
Date:   Fri, 23 Jul 2021 23:46:46 +0530
From:   Sunil Goutham <sgoutham@...vell.com>
To:     <netdev@...r.kernel.org>, <davem@...emloft.net>, <kuba@...nel.org>
CC:     Sunil Goutham <sgoutham@...vell.com>
Subject: [PATCH v2 2/2] octeontx2-pf: Support setting ntuple rule count

Added support for changing ethtool ntuple filter count.
Rule count change is supported only when there are no
ntuple filters installed.

Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
---
 .../ethernet/marvell/octeontx2/nic/otx2_common.h   |  1 +
 .../ethernet/marvell/octeontx2/nic/otx2_ethtool.c  |  3 +++
 .../ethernet/marvell/octeontx2/nic/otx2_flows.c    | 27 ++++++++++++++++++++--
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
index 8fd58cd..6fe2bf7 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
@@ -825,6 +825,7 @@ int otx2_get_all_flows(struct otx2_nic *pfvf,
 int otx2_add_flow(struct otx2_nic *pfvf,
 		  struct ethtool_rxnfc *nfc);
 int otx2_remove_flow(struct otx2_nic *pfvf, u32 location);
+int otx2_set_flow_rule_count(struct otx2_nic *pfvf, int count);
 int otx2_prepare_flow_request(struct ethtool_rx_flow_spec *fsp,
 			      struct npc_install_flow_req *req);
 void otx2_rss_ctx_flow_del(struct otx2_nic *pfvf, int ctx_id);
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
index 8df748e..753a8cf 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
@@ -690,6 +690,9 @@ static int otx2_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *nfc)
 		if (netif_running(dev) && ntuple)
 			ret = otx2_remove_flow(pfvf, nfc->fs.location);
 		break;
+	case ETHTOOL_SRXCLSRLCNT:
+		ret = otx2_set_flow_rule_count(pfvf, nfc->rule_cnt);
+		break;
 	default:
 		break;
 	}
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
index 4d9de52..ea2626c 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c
@@ -123,12 +123,29 @@ static int otx2_alloc_ntuple_mcam_entries(struct otx2_nic *pfvf, u16 count)
 
 	if (allocated != count)
 		netdev_info(pfvf->netdev,
-			    "Unable to allocate %d MCAM entries for ntuple, got %d\n",
-			    count, allocated);
+			    "Unable to allocate %d MCAM entries above default rules' "
+			    "start index %d, got only %d\n",
+			    count, flow_cfg->def_ent[0], allocated);
 
 	return allocated;
 }
 
+int otx2_set_flow_rule_count(struct otx2_nic *pfvf, int count)
+{
+	struct otx2_flow_config *flow_cfg = pfvf->flow_cfg;
+
+	if (!flow_cfg)
+		return 0;
+
+	if (flow_cfg->nr_flows) {
+		netdev_err(pfvf->netdev,
+			   "Cannot change count when there are active rules\n");
+		return 0;
+	}
+
+	return otx2_alloc_ntuple_mcam_entries(pfvf, count);
+}
+
 int otx2_alloc_mcam_entries(struct otx2_nic *pfvf)
 {
 	struct otx2_flow_config *flow_cfg = pfvf->flow_cfg;
@@ -923,6 +940,12 @@ int otx2_add_flow(struct otx2_nic *pfvf, struct ethtool_rxnfc *nfc)
 	int err = 0;
 	u32 ring;
 
+	if (!flow_cfg->ntuple_max_flows) {
+		netdev_err(pfvf->netdev,
+			   "Ntuple rule count is 0, allocate and retry\n");
+		return -EINVAL;
+	}
+
 	ring = ethtool_get_flow_spec_ring(fsp->ring_cookie);
 	if (!(pfvf->flags & OTX2_FLAG_NTUPLE_SUPPORT))
 		return -ENOMEM;
-- 
2.7.4