Subject: [PATCH v5 net-next 16/36] net/mlx5e: NVMEoTCP async ddp invalidation

From: Boris Pismenny <[email-masked]>
Date: Thu, 22 Jul 2021 14:03:05 +0300

From: Ben Ben-Ishay <[email-masked]>

Teardown ddp contexts asynchronously by posting a WQE, and calling back
to nvme-tcp when the corresponding CQE is received.

Signed-off-by: Boris Pismenny <[email-masked]>
Signed-off-by: Ben Ben-Ishay <[email-masked]>
Signed-off-by: Or Gerlitz <[email-masked]>
Signed-off-by: Yoray Zack <[email-masked]>
---
 .../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, 69 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
index 497c49f28d8a..f0190ee6e42c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
@@ -43,6 +43,7 @@ enum mlx5e_icosq_wqe_type {
 #endif
 #ifdef CONFIG_MLX5_EN_NVMEOTCP
 	MLX5E_ICOSQ_WQE_UMR_NVME_TCP,
+	MLX5E_ICOSQ_WQE_UMR_NVME_TCP_INVALIDATE,
 	MLX5E_ICOSQ_WQE_SET_PSV_NVME_TCP,
 #endif
 };
@@ -191,6 +192,9 @@ struct mlx5e_icosq_wqe_info {
 		struct {
 			struct mlx5e_nvmeotcp_queue *queue;
 		} nvmeotcp_q;
+		struct {
+			struct 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 2283b2a799f8..864b080cc8fc 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
@@ -152,6 +152,7 @@ enum wqe_type {
 	BSF_KLM_UMR = 1,
 	SET_PSV_UMR = 2,
 	BSF_UMR = 3,
+	KLM_INV_UMR = 4,
 };
 
 static void
@@ -208,6 +209,13 @@ build_nvmeotcp_klm_umr(struct mlx5e_nvmeotcp_queue *queue,
 				   MLX5E_KLM_UMR_DS_CNT(ALIGN(klm_entries, KLM_ALIGNMENT)));
 	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);
@@ -309,8 +317,8 @@ 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 wqe_bbs, u16 pi,
-		       enum wqe_type type)
+		       struct mlx5e_icosq *sq, u32 wqe_bbs,
+		       u16 pi, u16 ccid, enum wqe_type type)
 {
 	struct mlx5e_icosq_wqe_info *wi = &sq->db.wqe_info[pi];
 
@@ -319,12 +327,17 @@ mlx5e_nvmeotcp_fill_wi(struct mlx5e_nvmeotcp_queue *nvmeotcp_queue,
 	case SET_PSV_UMR:
 		wi->wqe_type = MLX5E_ICOSQ_WQE_SET_PSV_NVME_TCP;
 		break;
+	case KLM_INV_UMR:
+		wi->wqe_type = MLX5E_ICOSQ_WQE_UMR_NVME_TCP_INVALIDATE;
+		break;
 	default:
 		wi->wqe_type = MLX5E_ICOSQ_WQE_UMR_NVME_TCP;
 		break;
 	}
 
-	if (type == SET_PSV_UMR)
+	if (type == KLM_INV_UMR)
+		wi->nvmeotcp_qe.entry = &nvmeotcp_queue->ccid_table[ccid];
+	else if (type == SET_PSV_UMR)
 		wi->nvmeotcp_q.queue = nvmeotcp_queue;
 }
 
@@ -340,7 +353,7 @@ mlx5e_nvmeotcp_rx_post_static_params_wqe(struct mlx5e_nvmeotcp_queue *queue,
 	wqe_bbs = MLX5E_NVMEOTCP_STATIC_PARAMS_WQEBBS;
 	pi = mlx5e_icosq_get_next_pi(sq, wqe_bbs);
 	wqe = MLX5E_NVMEOTCP_FETCH_STATIC_PARAMS_WQE(sq, pi);
-	mlx5e_nvmeotcp_fill_wi(NULL, sq, wqe_bbs, pi, BSF_UMR);
+	mlx5e_nvmeotcp_fill_wi(NULL, sq, wqe_bbs, pi, 0, BSF_UMR);
 	build_nvmeotcp_static_params(queue, wqe, resync_seq, queue->zerocopy, queue->crc_rx);
 	sq->pc += wqe_bbs;
 	mlx5e_notify_hw(&sq->wq, sq->pc, sq->uar_map, &wqe->ctrl);
@@ -358,7 +371,7 @@ mlx5e_nvmeotcp_rx_post_progress_params_wqe(struct mlx5e_nvmeotcp_queue *queue,
 	wqe_bbs = MLX5E_NVMEOTCP_PROGRESS_PARAMS_WQEBBS;
 	pi = mlx5e_icosq_get_next_pi(sq, wqe_bbs);
 	wqe = MLX5E_NVMEOTCP_FETCH_PROGRESS_PARAMS_WQE(sq, pi);
-	mlx5e_nvmeotcp_fill_wi(queue, sq, wqe_bbs, pi, SET_PSV_UMR);
+	mlx5e_nvmeotcp_fill_wi(queue, sq, wqe_bbs, pi, 0, SET_PSV_UMR);
 	build_nvmeotcp_progress_params(queue, wqe, seq);
 	sq->pc += wqe_bbs;
 	mlx5e_notify_hw(&sq->wq, sq->pc, sq->uar_map, &wqe->ctrl);
@@ -382,7 +395,8 @@ post_klm_wqe(struct mlx5e_nvmeotcp_queue *queue,
 	wqe_bbs = DIV_ROUND_UP(wqe_sz, MLX5_SEND_WQE_BB);
 	pi = mlx5e_icosq_get_next_pi(sq, wqe_bbs);
 	wqe = MLX5E_NVMEOTCP_FETCH_KLM_WQE(sq, pi);
-	mlx5e_nvmeotcp_fill_wi(queue, sq, wqe_bbs, pi, wqe_type);
+	mlx5e_nvmeotcp_fill_wi(queue, sq, wqe_bbs, pi, ccid,
+			       klm_length ? KLM_UMR : KLM_INV_UMR);
 	build_nvmeotcp_klm_umr(queue, wqe, ccid, cur_klm_entries, *klm_offset,
 			       klm_length, wqe_type);
 	*klm_offset += cur_klm_entries;
@@ -400,8 +414,13 @@ mlx5e_nvmeotcp_post_klm_wqe(struct mlx5e_nvmeotcp_queue *queue,
 	struct mlx5e_icosq *sq = &queue->sq->icosq;
 
 	/* TODO: set stricter wqe_sz; using max for now */
-	wqes = DIV_ROUND_UP(klm_length, queue->max_klms_per_wqe);
-	wqe_sz = MLX5E_KLM_UMR_WQE_SZ(queue->max_klms_per_wqe);
+	if (klm_length == 0) {
+		wqes = 1;
+		wqe_sz = MLX5E_NVMEOTCP_STATIC_PARAMS_WQEBBS;
+	} else {
+		wqes = DIV_ROUND_UP(klm_length, queue->max_klms_per_wqe);
+		wqe_sz = MLX5E_KLM_UMR_WQE_SZ(queue->max_klms_per_wqe);
+	}
 
 	max_wqe_bbs = DIV_ROUND_UP(wqe_sz, MLX5_SEND_WQE_BB);
 
@@ -746,6 +765,24 @@ mlx5e_nvmeotcp_ddp_setup(struct net_device *netdev,
 	return 0;
 }
 
+void mlx5e_nvmeotcp_ddp_inv_done(struct mlx5e_icosq_wqe_info *wi)
+{
+	struct 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);
+}
+
 void mlx5e_nvmeotcp_ctx_comp(struct mlx5e_icosq_wqe_info *wi)
 {
 	struct mlx5e_nvmeotcp_queue *queue = wi->nvmeotcp_q.queue;
@@ -762,6 +799,19 @@ mlx5e_nvmeotcp_ddp_teardown(struct net_device *netdev,
 			    struct ulp_ddp_io *ddp,
 			    void *ddp_ctx)
 {
+	struct mlx5e_nvmeotcp_queue *queue;
+	struct mlx5e_priv *priv = netdev_priv(netdev);
+	struct nvmeotcp_queue_entry *q_entry;
+
+	queue = container_of(ulp_ddp_get_ctx(sk), struct mlx5e_nvmeotcp_queue, ulp_ddp_ctx);
+	q_entry  = &queue->ccid_table[ddp->command_id];
+	WARN_ON(q_entry->sgl_length == 0);
+
+	q_entry->ddp_ctx = ddp_ctx;
+	q_entry->queue = queue;
+
+	mlx5e_nvmeotcp_post_klm_wqe(queue, KLM_UMR, ddp->command_id, 0);
+
 	return 0;
 }
 
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 20141010817d..b9642e130b97 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.h
@@ -105,6 +105,7 @@ 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_comp(struct mlx5e_icosq_wqe_info *wi);
 int 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 bc7b19974ed9..e92dd4666955 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -628,6 +628,9 @@ void mlx5e_free_icosq_descs(struct mlx5e_icosq *sq)
 #ifdef CONFIG_MLX5_EN_NVMEOTCP
 		case MLX5E_ICOSQ_WQE_UMR_NVME_TCP:
 			break;
+		case MLX5E_ICOSQ_WQE_UMR_NVME_TCP_INVALIDATE:
+			mlx5e_nvmeotcp_ddp_inv_done(wi);
+			break;
 		case MLX5E_ICOSQ_WQE_SET_PSV_NVME_TCP:
 			mlx5e_nvmeotcp_ctx_comp(wi);
 			break;
@@ -706,6 +709,9 @@ int mlx5e_poll_ico_cq(struct mlx5e_cq *cq)
 #ifdef CONFIG_MLX5_EN_NVMEOTCP
 			case MLX5E_ICOSQ_WQE_UMR_NVME_TCP:
 				break;
+			case MLX5E_ICOSQ_WQE_UMR_NVME_TCP_INVALIDATE:
+				mlx5e_nvmeotcp_ddp_inv_done(wi);
+				break;
 			case MLX5E_ICOSQ_WQE_SET_PSV_NVME_TCP:
 				mlx5e_nvmeotcp_ctx_comp(wi);
 				break;
-- 
2.24.1