net/mlx5e: Update TX ESN context for IPSec hardware offload

ESN context must be synced between software and hardware for both RX
and TX. As the call to xfrm_dev_state_advance_esn() is added for TX,
this patch add the missing logic for TX. So the update is also checked
on every packet sent, to see if need to trigger ESN update worker.

Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c

@@ -94,25 +94,14 @@ static bool mlx5e_ipsec_update_esn_state(struct mlx5e_ipsec_sa_entry *sa_entry)
 	u32 esn, esn_msb;
 	u8 overlap;
 
-	switch (x->xso.type) {
-	case XFRM_DEV_OFFLOAD_PACKET:
-		switch (x->xso.dir) {
-		case XFRM_DEV_OFFLOAD_IN:
-			esn = x->replay_esn->seq;
-			esn_msb = x->replay_esn->seq_hi;
-			break;
-		case XFRM_DEV_OFFLOAD_OUT:
-			esn = x->replay_esn->oseq;
-			esn_msb = x->replay_esn->oseq_hi;
-			break;
-		default:
-			WARN_ON(true);
-			return false;
-		}
-		break;
-	case XFRM_DEV_OFFLOAD_CRYPTO:
-		/* Already parsed by XFRM core */
+	switch (x->xso.dir) {
+	case XFRM_DEV_OFFLOAD_IN:
 		esn = x->replay_esn->seq;
+		esn_msb = x->replay_esn->seq_hi;
+		break;
+	case XFRM_DEV_OFFLOAD_OUT:
+		esn = x->replay_esn->oseq;
+		esn_msb = x->replay_esn->oseq_hi;
 		break;
 	default:
 		WARN_ON(true);
@@ -121,11 +110,15 @@ static bool mlx5e_ipsec_update_esn_state(struct mlx5e_ipsec_sa_entry *sa_entry)
 
 	overlap = sa_entry->esn_state.overlap;
 
-	if (esn >= x->replay_esn->replay_window)
-		seq_bottom = esn - x->replay_esn->replay_window + 1;
+	if (!x->replay_esn->replay_window) {
+		seq_bottom = esn;
+	} else {
+		if (esn >= x->replay_esn->replay_window)
+			seq_bottom = esn - x->replay_esn->replay_window + 1;
 
-	if (x->xso.type == XFRM_DEV_OFFLOAD_CRYPTO)
-		esn_msb = xfrm_replay_seqhi(x, htonl(seq_bottom));
+		if (x->xso.type == XFRM_DEV_OFFLOAD_CRYPTO)
+			esn_msb = xfrm_replay_seqhi(x, htonl(seq_bottom));
+	}
 
 	if (sa_entry->esn_state.esn_msb)
 		sa_entry->esn_state.esn = esn;
@@ -980,9 +973,6 @@ static void mlx5e_xfrm_advance_esn_state(struct xfrm_state *x)
 	struct mlx5e_ipsec_sa_entry *sa_entry_shadow;
 	bool need_update;
 
-	if (x->xso.dir != XFRM_DEV_OFFLOAD_IN)
-		return;
-
 	need_update = mlx5e_ipsec_update_esn_state(sa_entry);
 	if (!need_update)
 		return;