net/mlx5e: kTLS, Add kTLS RX stats

Add global and per-channel ethtool SW stats for the device
offload.
Document the new counters in tls-offload.rst.

Signed-off-by: Tariq Toukan <[e-mail]>
Signed-off-by: Saeed Mahameed <[e-mail]>

Documentation/networking/tls-offload.rst

···
    which were part of a TLS stream.
  * ``rx_tls_decrypted_bytes`` - number of TLS payload bytes in RX packets
    which were successfully decrypted.
+ * ``rx_tls_ctx`` - number of TLS RX HW offload contexts added to device for
+   decryption.
+ * ``rx_tls_del`` - number of TLS RX HW offload contexts deleted from device
+   (connection has finished).
+ * ``rx_tls_resync_req_pkt`` - number of received TLS packets with a resync
+    request.
+ * ``rx_tls_resync_req_start`` - number of times the TLS async resync request
+    was started.
+ * ``rx_tls_resync_req_end`` - number of times the TLS async resync request
+    properly ended with providing the HW tracked tcp-seq.
+ * ``rx_tls_resync_req_skip`` - number of times the TLS async resync request
+    procedure was started by not properly ended.
+ * ``rx_tls_resync_res_ok`` - number of times the TLS resync response call to
+    the driver was successfully handled.
+ * ``rx_tls_resync_res_skip`` - number of times the TLS resync response call to
+    the driver was terminated unsuccessfully.
+ * ``rx_tls_err`` - number of RX packets which were part of a TLS stream
+   but were not decrypted due to unexpected error in the state machine.
  * ``tx_tls_encrypted_packets`` - number of TX packets passed to the device
    for encryption of their TLS payload.
  * ``tx_tls_encrypted_bytes`` - number of TLS payload bytes in TX packets

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

···
 	struct tls12_crypto_info_aes_gcm_128 crypto_info;
 	struct accel_rule rule;
 	struct sock *sk;
+	struct mlx5e_rq_stats *stats;
 	struct completion add_ctx;
 	u32 tirn;
 	u32 key_id;
···
 	return err;
 
 err_out:
+	priv_rx->stats->tls_resync_req_skip++;
 	err = PTR_ERR(cseg);
 	complete(&priv_rx->add_ctx);
 	goto unlock;
···
 	return cseg;
 
 err_out:
+	priv_rx->stats->tls_resync_req_skip++;
 	return ERR_PTR(err);
 }
 
···
 
 	cseg = post_static_params(sq, priv_rx);
 	if (IS_ERR(cseg)) {
+		priv_rx->stats->tls_resync_res_skip++;
 		err = PTR_ERR(cseg);
 		goto unlock;
 	}
 	/* Do not increment priv_rx refcnt, CQE handling is empty */
 	mlx5e_notify_hw(&sq->wq, sq->pc, sq->uar_map, cseg);
+	priv_rx->stats->tls_resync_res_ok++;
 unlock:
 	spin_unlock(&c->async_icosq_lock);
 
···
 	tracker_state = MLX5_GET(tls_progress_params, ctx, record_tracker_state);
 	auth_state = MLX5_GET(tls_progress_params, ctx, auth_state);
 	if (tracker_state != MLX5E_TLS_PROGRESS_PARAMS_RECORD_TRACKER_STATE_TRACKING ||
-	    auth_state != MLX5E_TLS_PROGRESS_PARAMS_AUTH_STATE_NO_OFFLOAD)
+	    auth_state != MLX5E_TLS_PROGRESS_PARAMS_AUTH_STATE_NO_OFFLOAD) {
+		priv_rx->stats->tls_resync_req_skip++;
 		goto out;
+	}
 
 	hw_seq = MLX5_GET(tls_progress_params, ctx, hw_resync_tcp_sn);
 	tls_offload_rx_resync_async_request_end(priv_rx->sk, cpu_to_be32(hw_seq));
+	priv_rx->stats->tls_resync_req_end++;
 out:
 	refcount_dec(&resync->refcnt);
 	kfree(buf);
···
 	seq = th->seq;
 	datalen = skb->len - depth;
 	tls_offload_rx_resync_async_request_start(sk, seq, datalen);
+	rq->stats->tls_resync_req_start++;
 }
 
 void mlx5e_ktls_rx_resync(struct net_device *netdev, struct sock *sk,
···
 			      struct mlx5_cqe64 *cqe, u32 *cqe_bcnt)
 {
 	u8 tls_offload = get_cqe_tls_offload(cqe);
+	struct mlx5e_rq_stats *stats;
 
 	if (likely(tls_offload == CQE_TLS_OFFLOAD_NOT_DECRYPTED))
 		return;
 
+	stats = rq->stats;
+
 	switch (tls_offload) {
 	case CQE_TLS_OFFLOAD_DECRYPTED:
 		skb->decrypted = 1;
+		stats->tls_decrypted_packets++;
+		stats->tls_decrypted_bytes += *cqe_bcnt;
 		break;
 	case CQE_TLS_OFFLOAD_RESYNC:
+		stats->tls_resync_req_pkt++;
 		resync_update_sn(rq, skb);
 		break;
 	default: /* CQE_TLS_OFFLOAD_ERROR: */
+		stats->tls_err++;
 		break;
 	}
 }
···
 
 	priv_rx->crypto_info  =
 		*(struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
-	priv_rx->sk = sk;
-	priv_rx->rxq = mlx5e_accel_sk_get_rxq(sk);
 
+	rxq = mlx5e_accel_sk_get_rxq(sk);
+	priv_rx->rxq = rxq;
+	priv_rx->sk = sk;
+
+	priv_rx->stats = &priv->channel_stats[rxq].rq;
 	mlx5e_set_ktls_rx_priv_ctx(tls_ctx, priv_rx);
 
-	rxq = priv_rx->rxq;
 	rqtn = priv->direct_tir[rxq].rqt.rqtn;
 
 	err = mlx5e_ktls_create_tir(mdev, &priv_rx->tirn, rqtn);
···
 	err = post_rx_param_wqes(priv->channels.c[rxq], priv_rx, start_offload_tcp_sn);
 	if (err)
 		goto err_post_wqes;
+
+	priv_rx->stats->tls_ctx++;
 
 	return 0;
 
···
 		refcount_dec(&resync->refcnt);
 	wait_for_resync(netdev, resync);
 
+	priv_rx->stats->tls_del++;
 	if (priv_rx->rule.rule)
 		mlx5e_accel_fs_del_sk(priv_rx->rule.rule);
 

drivers/net/ethernet/mellanox/mlx5/core/en_stats.c

···
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_congst_umr) },
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_arfs_err) },
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_recover) },
+#ifdef CONFIG_MLX5_EN_TLS
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_decrypted_packets) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_decrypted_bytes) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_ctx) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_del) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_resync_req_pkt) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_resync_req_start) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_resync_req_end) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_resync_req_skip) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_resync_res_ok) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_resync_res_skip) },
+	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_err) },
+#endif
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, ch_events) },
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, ch_poll) },
 	{ MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, ch_arm) },
···
 		s->rx_congst_umr  += rq_stats->congst_umr;
 		s->rx_arfs_err    += rq_stats->arfs_err;
 		s->rx_recover     += rq_stats->recover;
+#ifdef CONFIG_MLX5_EN_TLS
+		s->rx_tls_decrypted_packets += rq_stats->tls_decrypted_packets;
+		s->rx_tls_decrypted_bytes   += rq_stats->tls_decrypted_bytes;
+		s->rx_tls_ctx               += rq_stats->tls_ctx;
+		s->rx_tls_del               += rq_stats->tls_del;
+		s->rx_tls_resync_req_pkt    += rq_stats->tls_resync_req_pkt;
+		s->rx_tls_resync_req_start  += rq_stats->tls_resync_req_start;
+		s->rx_tls_resync_req_end    += rq_stats->tls_resync_req_end;
+		s->rx_tls_resync_req_skip   += rq_stats->tls_resync_req_skip;
+		s->rx_tls_resync_res_ok     += rq_stats->tls_resync_res_ok;
+		s->rx_tls_resync_res_skip   += rq_stats->tls_resync_res_skip;
+		s->rx_tls_err               += rq_stats->tls_err;
+#endif
 		s->ch_events      += ch_stats->events;
 		s->ch_poll        += ch_stats->poll;
 		s->ch_arm         += ch_stats->arm;
···
 	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, congst_umr) },
 	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, arfs_err) },
 	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, recover) },
+#ifdef CONFIG_MLX5_EN_TLS
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_decrypted_packets) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_decrypted_bytes) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_ctx) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_del) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_resync_req_pkt) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_resync_req_start) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_resync_req_end) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_resync_req_skip) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_resync_res_ok) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_resync_res_skip) },
+	{ MLX5E_DECLARE_RX_STAT(struct mlx5e_rq_stats, tls_err) },
+#endif
 };
 
 static const struct counter_desc sq_stats_desc[] = {

drivers/net/ethernet/mellanox/mlx5/core/en_stats.h

···
 	u64 tx_tls_skip_no_sync_data;
 	u64 tx_tls_drop_no_sync_data;
 	u64 tx_tls_drop_bypass_req;
+
+	u64 rx_tls_decrypted_packets;
+	u64 rx_tls_decrypted_bytes;
+	u64 rx_tls_ctx;
+	u64 rx_tls_del;
+	u64 rx_tls_resync_req_pkt;
+	u64 rx_tls_resync_req_start;
+	u64 rx_tls_resync_req_end;
+	u64 rx_tls_resync_req_skip;
+	u64 rx_tls_resync_res_ok;
+	u64 rx_tls_resync_res_skip;
+	u64 rx_tls_err;
 #endif
 
 	u64 rx_xsk_packets;
···
 	u64 congst_umr;
 	u64 arfs_err;
 	u64 recover;
+#ifdef CONFIG_MLX5_EN_TLS
+	u64 tls_decrypted_packets;
+	u64 tls_decrypted_bytes;
+	u64 tls_ctx;
+	u64 tls_del;
+	u64 tls_resync_req_pkt;
+	u64 tls_resync_req_start;
+	u64 tls_resync_req_end;
+	u64 tls_resync_req_skip;
+	u64 tls_resync_res_ok;
+	u64 tls_resync_res_skip;
+	u64 tls_err;
+#endif
 };
 
 struct mlx5e_sq_stats {