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Date: Tue, 14 Nov 2023 12:42:52 +0000
From: Aurelien Aptel <aaptel@...dia.com>
To: linux-nvme@...ts.infradead.org,
	netdev@...r.kernel.org,
	sagi@...mberg.me,
	hch@....de,
	kbusch@...nel.org,
	axboe@...com,
	chaitanyak@...dia.com,
	davem@...emloft.net,
	kuba@...nel.org
Cc: aaptel@...dia.com,
	aurelien.aptel@...il.com,
	smalin@...dia.com,
	malin1024@...il.com,
	ogerlitz@...dia.com,
	yorayz@...dia.com,
	borisp@...dia.com,
	galshalom@...dia.com,
	mgurtovoy@...dia.com
Subject: [PATCH v19 18/20] net/mlx5e: NVMEoTCP, async ddp invalidation

From: Ben Ben-Ishay <benishay@...dia.com>

After the ULP consumed the buffers of the offloaded request, it calls the
ddp_teardown op to release the NIC mapping for them and allow the NIC to
reuse the HW contexts associated with offloading this IO. We do a
fast/async un-mapping via UMR WQE. In this case, the ULP does holds off
with completing the request towards the upper/application layers until the
HW unmapping is done.

When the corresponding CQE is received, a notification is done via the
the teardown_done ddp callback advertised by the ULP in the ddp context.

Signed-off-by: Ben Ben-Ishay <benishay@...dia.com>
Signed-off-by: Boris Pismenny <borisp@...dia.com>
Signed-off-by: Or Gerlitz <ogerlitz@...dia.com>
Signed-off-by: Yoray Zack <yorayz@...dia.com>
Signed-off-by: Aurelien Aptel <aaptel@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
---
 .../net/ethernet/mellanox/mlx5/core/en/txrx.h |  4 ++
 .../mellanox/mlx5/core/en_accel/nvmeotcp.c    | 66 ++++++++++++++++---
 .../mellanox/mlx5/core/en_accel/nvmeotcp.h    |  1 +
 .../net/ethernet/mellanox/mlx5/core/en_rx.c   |  6 ++
 4 files changed, 67 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
index c87dca17d5c8..3c124f708afc 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
@@ -52,6 +52,7 @@ enum mlx5e_icosq_wqe_type {
 #endif
 #ifdef CONFIG_MLX5_EN_NVMEOTCP
 	MLX5E_ICOSQ_WQE_UMR_NVMEOTCP,
+	MLX5E_ICOSQ_WQE_UMR_NVMEOTCP_INVALIDATE,
 	MLX5E_ICOSQ_WQE_SET_PSV_NVMEOTCP,
 #endif
 };
@@ -230,6 +231,9 @@ struct mlx5e_icosq_wqe_info {
 		struct {
 			struct mlx5e_nvmeotcp_queue *queue;
 		} nvmeotcp_q;
+		struct {
+			struct mlx5e_nvmeotcp_queue_entry *entry;
+		} nvmeotcp_qe;
 #endif
 	};
 };
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
index 8644021b8996..462e0d97f82c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
@@ -142,10 +142,11 @@ build_nvmeotcp_klm_umr(struct mlx5e_nvmeotcp_queue *queue, struct mlx5e_umr_wqe
 		       u16 ccid, int klm_entries, u32 klm_offset, u32 len,
 		       enum wqe_type klm_type)
 {
-	u32 id = (klm_type == KLM_UMR) ? queue->ccid_table[ccid].klm_mkey :
-		 (mlx5e_tir_get_tirn(&queue->tir) << MLX5_WQE_CTRL_TIR_TIS_INDEX_SHIFT);
-	u8 opc_mod = (klm_type == KLM_UMR) ? MLX5_CTRL_SEGMENT_OPC_MOD_UMR_UMR :
-		MLX5_OPC_MOD_TRANSPORT_TIR_STATIC_PARAMS;
+	u32 id = (klm_type == BSF_KLM_UMR) ?
+		 (mlx5e_tir_get_tirn(&queue->tir) << MLX5_WQE_CTRL_TIR_TIS_INDEX_SHIFT) :
+		 queue->ccid_table[ccid].klm_mkey;
+	u8 opc_mod = (klm_type == BSF_KLM_UMR) ? MLX5_OPC_MOD_TRANSPORT_TIR_STATIC_PARAMS :
+		     MLX5_CTRL_SEGMENT_OPC_MOD_UMR_UMR;
 	u32 ds_cnt = MLX5E_KLM_UMR_DS_CNT(ALIGN(klm_entries, MLX5_UMR_KLM_NUM_ENTRIES_ALIGNMENT));
 	struct mlx5_wqe_umr_ctrl_seg *ucseg = &wqe->uctrl;
 	struct mlx5_wqe_ctrl_seg *cseg = &wqe->ctrl;
@@ -158,6 +159,13 @@ build_nvmeotcp_klm_umr(struct mlx5e_nvmeotcp_queue *queue, struct mlx5e_umr_wqe
 	cseg->qpn_ds = cpu_to_be32((sqn << MLX5_WQE_CTRL_QPN_SHIFT) | ds_cnt);
 	cseg->general_id = cpu_to_be32(id);
 
+	if (!klm_entries) { /* this is invalidate */
+		ucseg->mkey_mask = cpu_to_be64(MLX5_MKEY_MASK_FREE);
+		ucseg->flags = MLX5_UMR_INLINE;
+		mkc->status = MLX5_MKEY_STATUS_FREE;
+		return;
+	}
+
 	if (klm_type == KLM_UMR && !klm_offset) {
 		ucseg->mkey_mask = cpu_to_be64(MLX5_MKEY_MASK_XLT_OCT_SIZE |
 					       MLX5_MKEY_MASK_LEN | MLX5_MKEY_MASK_FREE);
@@ -259,8 +267,8 @@ build_nvmeotcp_static_params(struct mlx5e_nvmeotcp_queue *queue,
 
 static void
 mlx5e_nvmeotcp_fill_wi(struct mlx5e_nvmeotcp_queue *nvmeotcp_queue,
-		       struct mlx5e_icosq *sq, u32 wqebbs, u16 pi,
-		       enum wqe_type type)
+		       struct mlx5e_icosq *sq, u32 wqebbs,
+		       u16 pi, u16 ccid, enum wqe_type type)
 {
 	struct mlx5e_icosq_wqe_info *wi = &sq->db.wqe_info[pi];
 
@@ -272,6 +280,10 @@ mlx5e_nvmeotcp_fill_wi(struct mlx5e_nvmeotcp_queue *nvmeotcp_queue,
 		wi->wqe_type = MLX5E_ICOSQ_WQE_SET_PSV_NVMEOTCP;
 		wi->nvmeotcp_q.queue = nvmeotcp_queue;
 		break;
+	case KLM_INV_UMR:
+		wi->wqe_type = MLX5E_ICOSQ_WQE_UMR_NVMEOTCP_INVALIDATE;
+		wi->nvmeotcp_qe.entry = &nvmeotcp_queue->ccid_table[ccid];
+		break;
 	default:
 		/* cases where no further action is required upon completion, such as ddp setup */
 		wi->wqe_type = MLX5E_ICOSQ_WQE_UMR_NVMEOTCP;
@@ -290,7 +302,7 @@ mlx5e_nvmeotcp_rx_post_static_params_wqe(struct mlx5e_nvmeotcp_queue *queue, u32
 	wqebbs = MLX5E_TRANSPORT_SET_STATIC_PARAMS_WQEBBS;
 	pi = mlx5e_icosq_get_next_pi(sq, wqebbs);
 	wqe = MLX5E_TRANSPORT_FETCH_SET_STATIC_PARAMS_WQE(sq, pi);
-	mlx5e_nvmeotcp_fill_wi(NULL, sq, wqebbs, pi, BSF_UMR);
+	mlx5e_nvmeotcp_fill_wi(NULL, sq, wqebbs, pi, 0, BSF_UMR);
 	build_nvmeotcp_static_params(queue, wqe, resync_seq, queue->crc_rx);
 	sq->pc += wqebbs;
 	mlx5e_notify_hw(&sq->wq, sq->pc, sq->uar_map, &wqe->ctrl);
@@ -307,7 +319,7 @@ mlx5e_nvmeotcp_rx_post_progress_params_wqe(struct mlx5e_nvmeotcp_queue *queue, u
 	wqebbs = MLX5E_NVMEOTCP_PROGRESS_PARAMS_WQEBBS;
 	pi = mlx5e_icosq_get_next_pi(sq, wqebbs);
 	wqe = MLX5E_NVMEOTCP_FETCH_PROGRESS_PARAMS_WQE(sq, pi);
-	mlx5e_nvmeotcp_fill_wi(queue, sq, wqebbs, pi, SET_PSV_UMR);
+	mlx5e_nvmeotcp_fill_wi(queue, sq, wqebbs, pi, 0, SET_PSV_UMR);
 	build_nvmeotcp_progress_params(queue, wqe, seq);
 	sq->pc += wqebbs;
 	mlx5e_notify_hw(&sq->wq, sq->pc, sq->uar_map, &wqe->ctrl);
@@ -330,7 +342,7 @@ post_klm_wqe(struct mlx5e_nvmeotcp_queue *queue,
 	wqebbs = DIV_ROUND_UP(wqe_sz, MLX5_SEND_WQE_BB);
 	pi = mlx5e_icosq_get_next_pi(sq, wqebbs);
 	wqe = MLX5E_NVMEOTCP_FETCH_KLM_WQE(sq, pi);
-	mlx5e_nvmeotcp_fill_wi(queue, sq, wqebbs, pi, wqe_type);
+	mlx5e_nvmeotcp_fill_wi(queue, sq, wqebbs, pi, ccid, wqe_type);
 	build_nvmeotcp_klm_umr(queue, wqe, ccid, cur_klm_entries, klm_offset,
 			       klm_length, wqe_type);
 	sq->pc += wqebbs;
@@ -345,7 +357,10 @@ mlx5e_nvmeotcp_post_klm_wqe(struct mlx5e_nvmeotcp_queue *queue, enum wqe_type wq
 	struct mlx5e_icosq *sq = &queue->sq;
 	u32 klm_offset = 0, wqes, i;
 
-	wqes = DIV_ROUND_UP(klm_length, queue->max_klms_per_wqe);
+	if (wqe_type == KLM_INV_UMR)
+		wqes = 1;
+	else
+		wqes = DIV_ROUND_UP(klm_length, queue->max_klms_per_wqe);
 
 	spin_lock_bh(&queue->sq_lock);
 
@@ -844,12 +859,43 @@ void mlx5e_nvmeotcp_ctx_complete(struct mlx5e_icosq_wqe_info *wi)
 	complete(&queue->static_params_done);
 }
 
+void mlx5e_nvmeotcp_ddp_inv_done(struct mlx5e_icosq_wqe_info *wi)
+{
+	struct mlx5e_nvmeotcp_queue_entry *q_entry = wi->nvmeotcp_qe.entry;
+	struct mlx5e_nvmeotcp_queue *queue = q_entry->queue;
+	struct mlx5_core_dev *mdev = queue->priv->mdev;
+	struct ulp_ddp_io *ddp = q_entry->ddp;
+	const struct ulp_ddp_ulp_ops *ulp_ops;
+
+	dma_unmap_sg(mdev->device, ddp->sg_table.sgl,
+		     q_entry->sgl_length, DMA_FROM_DEVICE);
+
+	q_entry->sgl_length = 0;
+
+	ulp_ops = inet_csk(queue->sk)->icsk_ulp_ddp_ops;
+	if (ulp_ops && ulp_ops->ddp_teardown_done)
+		ulp_ops->ddp_teardown_done(q_entry->ddp_ctx);
+}
+
 static void
 mlx5e_nvmeotcp_ddp_teardown(struct net_device *netdev,
 			    struct sock *sk,
 			    struct ulp_ddp_io *ddp,
 			    void *ddp_ctx)
 {
+	struct mlx5e_nvmeotcp_queue_entry *q_entry;
+	struct mlx5e_nvmeotcp_queue *queue;
+
+	queue = container_of(ulp_ddp_get_ctx(sk), struct mlx5e_nvmeotcp_queue, ulp_ddp_ctx);
+	q_entry  = &queue->ccid_table[ddp->command_id];
+	WARN_ONCE(q_entry->sgl_length == 0,
+		  "Invalidation of empty sgl (CID 0x%x, queue 0x%x)\n",
+		  ddp->command_id, queue->id);
+
+	q_entry->ddp_ctx = ddp_ctx;
+	q_entry->queue = queue;
+
+	mlx5e_nvmeotcp_post_klm_wqe(queue, KLM_INV_UMR, ddp->command_id, 0);
 }
 
 static void
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.h
index 8b29f3fde7f2..13817d8a0aae 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.h
@@ -109,6 +109,7 @@ void mlx5e_nvmeotcp_cleanup(struct mlx5e_priv *priv);
 struct mlx5e_nvmeotcp_queue *
 mlx5e_nvmeotcp_get_queue(struct mlx5e_nvmeotcp *nvmeotcp, int id);
 void mlx5e_nvmeotcp_put_queue(struct mlx5e_nvmeotcp_queue *queue);
+void mlx5e_nvmeotcp_ddp_inv_done(struct mlx5e_icosq_wqe_info *wi);
 void mlx5e_nvmeotcp_ctx_complete(struct mlx5e_icosq_wqe_info *wi);
 static inline void mlx5e_nvmeotcp_init_rx(struct mlx5e_priv *priv) {}
 void mlx5e_nvmeotcp_cleanup_rx(struct mlx5e_priv *priv);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index 1ed206b9d189..b0dabb349b7b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -968,6 +968,9 @@ void mlx5e_free_icosq_descs(struct mlx5e_icosq *sq)
 			break;
 #endif
 #ifdef CONFIG_MLX5_EN_NVMEOTCP
+		case MLX5E_ICOSQ_WQE_UMR_NVMEOTCP_INVALIDATE:
+			mlx5e_nvmeotcp_ddp_inv_done(wi);
+			break;
 		case MLX5E_ICOSQ_WQE_SET_PSV_NVMEOTCP:
 			mlx5e_nvmeotcp_ctx_complete(wi);
 			break;
@@ -1073,6 +1076,9 @@ int mlx5e_poll_ico_cq(struct mlx5e_cq *cq, int budget)
 #ifdef CONFIG_MLX5_EN_NVMEOTCP
 			case MLX5E_ICOSQ_WQE_UMR_NVMEOTCP:
 				break;
+			case MLX5E_ICOSQ_WQE_UMR_NVMEOTCP_INVALIDATE:
+				mlx5e_nvmeotcp_ddp_inv_done(wi);
+				break;
 			case MLX5E_ICOSQ_WQE_SET_PSV_NVMEOTCP:
 				mlx5e_nvmeotcp_ctx_complete(wi);
 				break;
-- 
2.34.1


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