netdev - [PATCH net-next] cxgb4: Delete all hash and TCAM filters before resource cleanup

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Date:   Fri, 26 Apr 2019 13:58:48 +0530
From:   Vishal Kulkarni <vishal@...lsio.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     nirranjan@...lsio.com, indranil@...lsio.com, dt@...lsio.com,
        Vishal Kulkarni <vishal@...lsio.com>
Subject: [PATCH net-next] cxgb4: Delete all hash and TCAM filters before resource cleanup

During driver unload, hash/TCAM filter deletion doesn't wait for
completion.This patch deletes all the filters with completion before
clearing the resources.

Signed-off-by: Vishal Kulkarni <vishal@...lsio.com>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c | 34 +++++++++++++++++++----
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c   | 10 +++----
 2 files changed, 33 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
index 93ad4be..4107007 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_filter.c
@@ -524,8 +524,7 @@ static int del_filter_wr(struct adapter *adapter, int fidx)
 		return -ENOMEM;
 
 	fwr = __skb_put(skb, len);
-	t4_mk_filtdelwr(f->tid, fwr, (adapter->flags & CXGB4_SHUTTING_DOWN) ? -1
-			: adapter->sge.fw_evtq.abs_id);
+	t4_mk_filtdelwr(f->tid, fwr, adapter->sge.fw_evtq.abs_id);
 
 	/* Mark the filter as "pending" and ship off the Filter Work Request.
 	 * When we get the Work Request Reply we'll clear the pending status.
@@ -744,16 +743,40 @@ void clear_filter(struct adapter *adap, struct filter_entry *f)
 
 void clear_all_filters(struct adapter *adapter)
 {
+	struct net_device *dev = adapter->port[0];
 	unsigned int i;
 
 	if (adapter->tids.ftid_tab) {
 		struct filter_entry *f = &adapter->tids.ftid_tab[0];
 		unsigned int max_ftid = adapter->tids.nftids +
 					adapter->tids.nsftids;
-
+		/* Clear all TCAM filters */
 		for (i = 0; i < max_ftid; i++, f++)
 			if (f->valid || f->pending)
-				clear_filter(adapter, f);
+				cxgb4_del_filter(dev, i, &f->fs);
+	}
+
+	/* Clear all hash filters */
+	if (is_hashfilter(adapter) && adapter->tids.tid_tab) {
+		struct filter_entry *f;
+		unsigned int sb;
+
+		for (i = adapter->tids.hash_base;
+		     i <= adapter->tids.ntids; i++) {
+			f = (struct filter_entry *)
+				adapter->tids.tid_tab[i];
+
+			if (f && (f->valid || f->pending))
+				cxgb4_del_filter(dev, i, &f->fs);
+		}
+
+		sb = t4_read_reg(adapter, LE_DB_SRVR_START_INDEX_A);
+		for (i = 0; i < sb; i++) {
+			f = (struct filter_entry *)adapter->tids.tid_tab[i];
+
+			if (f && (f->valid || f->pending))
+				cxgb4_del_filter(dev, i, &f->fs);
+		}
 	}
 }
 
@@ -1568,9 +1591,8 @@ int cxgb4_del_filter(struct net_device *dev, int filter_id,
 	struct filter_ctx ctx;
 	int ret;
 
-	/* If we are shutting down the adapter do not wait for completion */
 	if (netdev2adap(dev)->flags & CXGB4_SHUTTING_DOWN)
-		return __cxgb4_del_filter(dev, filter_id, fs, NULL);
+		return 0;
 
 	init_completion(&ctx.completion);
 
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index 3339f1f..7487852 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -6024,6 +6024,11 @@ static void remove_one(struct pci_dev *pdev)
 		return;
 	}
 
+	/* If we allocated filters, free up state associated with any
+	 * valid filters ...
+	 */
+	clear_all_filters(adapter);
+
 	adapter->flags |= CXGB4_SHUTTING_DOWN;
 
 	if (adapter->pf == 4) {
@@ -6054,11 +6059,6 @@ static void remove_one(struct pci_dev *pdev)
 		if (IS_REACHABLE(CONFIG_THERMAL))
 			cxgb4_thermal_remove(adapter);
 
-		/* If we allocated filters, free up state associated with any
-		 * valid filters ...
-		 */
-		clear_all_filters(adapter);
-
 		if (adapter->flags & CXGB4_FULL_INIT_DONE)
 			cxgb_down(adapter);
 
-- 
1.8.3.1