[PATCH 5.15 073/244] octeontx2-af: Fix mcam entry resource leak

Greg Kroah-Hartman
2022-08-23T09:52:46Z

From: Subbaraya Sundeep <sbhatta@marvell.com>

commit 3f8fe40ab7730cf8eb6f8b8ff412012f7f6f8f48 upstream.

The teardown sequence in FLR handler returns if no NIX LF
is attached to PF/VF because it indicates that graceful
shutdown of resources already happened. But there is a
chance of all allocated MCAM entries not being freed by
PF/VF. Hence free mcam entries even in case of detached LF.

Fixes: c554f9c1574e ("octeontx2-af: Teardown NPA, NIX LF upon receiving FLR")
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/marvell/octeontx2/af/rvu.c | 6 ++++++
drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c | 6 ++++++
2 files changed, 12 insertions(+)

--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
@@ -2504,6 +2504,12 @@ static void __rvu_flr_handler(struct rvu
rvu_blklf_teardown(rvu, pcifunc, BLKADDR_NPA);
rvu_reset_lmt_map_tbl(rvu, pcifunc);
rvu_detach_rsrcs(rvu, NULL, pcifunc);
+ /* In scenarios where PF/VF drivers detach NIXLF without freeing MCAM
+ * entries, check and free the MCAM entries explicitly to avoid leak.
+ * Since LF is detached use LF number as -1.
+ */
+ rvu_npc_free_mcam_entries(rvu, pcifunc, -1);
+
mutex_unlock(&rvu->flr_lock);
}

--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc.c
@@ -1096,6 +1096,9 @@ static void npc_enadis_default_entries(s

void rvu_npc_disable_default_entries(struct rvu *rvu, u16 pcifunc, int nixlf)
{
+ if (nixlf < 0)
+ return;
+
npc_enadis_default_entries(rvu, pcifunc, nixlf, false);

/* Delete multicast and promisc MCAM entries */
@@ -1107,6 +1110,9 @@ void rvu_npc_disable_default_entries(str

void rvu_npc_enable_default_entries(struct rvu *rvu, u16 pcifunc, int nixlf)
{
+ if (nixlf < 0)
+ return;
+
/* Enables only broadcast match entry. Promisc/Allmulti are enabled
* in set_rx_mode mbox handler.
*/