netdev - [PATCH v5 net-next 17/36] net/mlx5e: NVMEoTCP ddp setup and resync

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Date:   Thu, 22 Jul 2021 14:03:06 +0300
From:   Boris Pismenny <borisp@...dia.com>
To:     <dsahern@...il.com>, <kuba@...nel.org>, <davem@...emloft.net>,
        <saeedm@...dia.com>, <hch@....de>, <sagi@...mberg.me>,
        <axboe@...com>, <kbusch@...nel.org>, <viro@...iv.linux.org.uk>,
        <edumazet@...gle.com>, <smalin@...vell.com>
CC:     <boris.pismenny@...il.com>, <linux-nvme@...ts.infradead.org>,
        <netdev@...r.kernel.org>, <benishay@...dia.com>,
        <ogerlitz@...dia.com>, <yorayz@...dia.com>,
        Boris Pismenny <borisp@...lanox.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Yoray Zack <yorayz@...lanox.com>
Subject: [PATCH v5 net-next 17/36] net/mlx5e: NVMEoTCP ddp setup and resync

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

NVMEoTCP offload uses buffer registration for every NVME request to
perform direct data placement, The registration is done via KLM UMR
WQE's.  The driver resync handler advertise the software resync response
via static params WQE.

Signed-off-by: Boris Pismenny <borisp@...lanox.com>
Signed-off-by: Ben Ben-Ishay <benishay@...dia.com>
Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
Signed-off-by: Yoray Zack <yorayz@...lanox.com>
---
 .../mellanox/mlx5/core/en_accel/nvmeotcp.c    | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

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 864b080cc8fc..4fdfbe4468ee 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
@@ -762,6 +762,30 @@ mlx5e_nvmeotcp_ddp_setup(struct net_device *netdev,
 			 struct sock *sk,
 			 struct ulp_ddp_io *ddp)
 {
+	struct mlx5e_priv *priv = netdev_priv(netdev);
+	struct scatterlist *sg = ddp->sg_table.sgl;
+	struct mlx5e_nvmeotcp_queue *queue;
+	struct mlx5_core_dev *mdev;
+	int i, size = 0, count = 0;
+
+	queue = container_of(ulp_ddp_get_ctx(sk), struct mlx5e_nvmeotcp_queue, ulp_ddp_ctx);
+
+	mdev = queue->priv->mdev;
+	count = dma_map_sg(mdev->device, ddp->sg_table.sgl, ddp->nents,
+			   DMA_FROM_DEVICE);
+
+	if (WARN_ON(count > mlx5e_get_max_sgl(mdev)))
+		return -ENOSPC;
+
+	for (i = 0; i < count; i++)
+		size += sg[i].length;
+
+	queue->ccid_table[ddp->command_id].size = size;
+	queue->ccid_table[ddp->command_id].ddp = ddp;
+	queue->ccid_table[ddp->command_id].sgl = sg;
+	queue->ccid_table[ddp->command_id].ccid_gen++;
+	queue->ccid_table[ddp->command_id].sgl_length = count;
+
 	return 0;
 }
 
@@ -819,6 +843,11 @@ static void
 mlx5e_nvmeotcp_dev_resync(struct net_device *netdev,
 			  struct sock *sk, u32 seq)
 {
+	struct mlx5e_nvmeotcp_queue *queue =
+		container_of(ulp_ddp_get_ctx(sk), struct mlx5e_nvmeotcp_queue, ulp_ddp_ctx);
+
+	queue->after_resync_cqe = 1;
+	mlx5e_nvmeotcp_rx_post_static_params_wqe(queue, seq);
 }
 
 static const struct ulp_ddp_dev_ops mlx5e_nvmeotcp_ops = {
-- 
2.24.1