netdev - [PATCH net-next 09/11] sfc: attach an MAE counter to TC actions that need it

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Date:   Tue, 8 Nov 2022 17:24:50 +0000
From:   <edward.cree@....com>
To:     <netdev@...r.kernel.org>, <linux-net-drivers@....com>
CC:     <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <edumazet@...gle.com>, <habetsm.xilinx@...il.com>,
        Edward Cree <ecree.xilinx@...il.com>
Subject: [PATCH net-next 09/11] sfc: attach an MAE counter to TC actions that need it

From: Edward Cree <ecree.xilinx@...il.com>

The only actions that expect stats (that sfc HW supports) are gact shot
 (drop), mirred redirect and mirred mirror.  Since these are 'deliverish'
 actions that end an action-set, we only require at most one counter per
 action-set.

Signed-off-by: Edward Cree <ecree.xilinx@...il.com>
---
 drivers/net/ethernet/sfc/mae.c |  8 ++++++--
 drivers/net/ethernet/sfc/tc.c  | 25 +++++++++++++++++++++++++
 drivers/net/ethernet/sfc/tc.h  |  1 +
 3 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/sfc/mae.c b/drivers/net/ethernet/sfc/mae.c
index f227b4f2a9a0..583baf69981c 100644
--- a/drivers/net/ethernet/sfc/mae.c
+++ b/drivers/net/ethernet/sfc/mae.c
@@ -501,8 +501,12 @@ int efx_mae_alloc_action_set(struct efx_nic *efx, struct efx_tc_action_set *act)
 		       MC_CMD_MAE_MAC_ADDR_ALLOC_OUT_MAC_ID_NULL);
 	MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_DST_MAC_ID,
 		       MC_CMD_MAE_MAC_ADDR_ALLOC_OUT_MAC_ID_NULL);
-	MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_COUNTER_ID,
-		       MC_CMD_MAE_COUNTER_ALLOC_OUT_COUNTER_ID_NULL);
+	if (act->count && !WARN_ON(!act->count->cnt))
+		MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_COUNTER_ID,
+			       act->count->cnt->fw_id);
+	else
+		MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_COUNTER_ID,
+			       MC_CMD_MAE_COUNTER_ALLOC_OUT_COUNTER_ID_NULL);
 	MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_COUNTER_LIST_ID,
 		       MC_CMD_MAE_COUNTER_LIST_ALLOC_OUT_COUNTER_LIST_ID_NULL);
 	MCDI_SET_DWORD(inbuf, MAE_ACTION_SET_ALLOC_IN_ENCAP_HEADER_ID,
diff --git a/drivers/net/ethernet/sfc/tc.c b/drivers/net/ethernet/sfc/tc.c
index 8ea7f5213049..1cfc50f2398e 100644
--- a/drivers/net/ethernet/sfc/tc.c
+++ b/drivers/net/ethernet/sfc/tc.c
@@ -77,6 +77,8 @@ static void efx_tc_free_action_set(struct efx_nic *efx,
 		 */
 		list_del(&act->list);
 	}
+	if (act->count)
+		efx_tc_flower_put_counter_index(efx, act->count);
 	kfree(act);
 }
 
@@ -376,6 +378,28 @@ static int efx_tc_flower_replace(struct efx_nic *efx,
 			goto release;
 		}
 
+		if ((fa->id == FLOW_ACTION_REDIRECT ||
+		     fa->id == FLOW_ACTION_MIRRED ||
+		     fa->id == FLOW_ACTION_DROP) && fa->hw_stats) {
+			struct efx_tc_counter_index *ctr;
+
+			if (!(fa->hw_stats & FLOW_ACTION_HW_STATS_DELAYED)) {
+				NL_SET_ERR_MSG_FMT_MOD(extack, "hw_stats_type %u not supported (only 'delayed')",
+						       fa->hw_stats);
+				rc = -EOPNOTSUPP;
+				goto release;
+			}
+
+			ctr = efx_tc_flower_get_counter_index(efx, tc->cookie,
+							      EFX_TC_COUNTER_TYPE_AR);
+			if (IS_ERR(ctr)) {
+				rc = PTR_ERR(ctr);
+				NL_SET_ERR_MSG_MOD(extack, "Failed to obtain a counter");
+				goto release;
+			}
+			act->count = ctr;
+		}
+
 		switch (fa->id) {
 		case FLOW_ACTION_DROP:
 			rc = efx_mae_alloc_action_set(efx, act);
@@ -412,6 +436,7 @@ static int efx_tc_flower_replace(struct efx_nic *efx,
 			if (fa->id == FLOW_ACTION_REDIRECT)
 				break; /* end of the line */
 			/* Mirror, so continue on with saved act */
+			save.count = NULL;
 			act = kzalloc(sizeof(*act), GFP_USER);
 			if (!act) {
 				rc = -ENOMEM;
diff --git a/drivers/net/ethernet/sfc/tc.h b/drivers/net/ethernet/sfc/tc.h
index 6c8ebb2d79c0..418ce8c13a06 100644
--- a/drivers/net/ethernet/sfc/tc.h
+++ b/drivers/net/ethernet/sfc/tc.h
@@ -20,6 +20,7 @@
 
 struct efx_tc_action_set {
 	u16 deliver:1;
+	struct efx_tc_counter_index *count;
 	u32 dest_mport;
 	u32 fw_id; /* index of this entry in firmware actions table */
 	struct list_head list;