netdev - [PATCH v3 net-next 18/21] net/mlx5e: NVMEoTCP ddp setup and resync

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Message-Id: <20210201100509.27351-19-borisp@mellanox.com>
Date:   Mon,  1 Feb 2021 12:05:06 +0200
From:   Boris Pismenny <borisp@...lanox.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, Or Gerlitz <ogerlitz@...lanox.com>,
        Yoray Zack <yorayz@...lanox.com>
Subject: [PATCH v3 net-next  18/21] 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    | 33 +++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

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 f30bfcb43701..4cbd86b9ed42 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/nvmeotcp.c
@@ -754,6 +754,30 @@ mlx5e_nvmeotcp_ddp_setup(struct net_device *netdev,
 			 struct sock *sk,
 			 struct tcp_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(tcp_ddp_get_ctx(sk), struct mlx5e_nvmeotcp_queue, tcp_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;
 }
 
@@ -791,11 +815,11 @@ mlx5e_nvmeotcp_ddp_teardown(struct net_device *netdev,
 			    struct tcp_ddp_io *ddp,
 			    void *ddp_ctx)
 {
-	struct mlx5e_nvmeotcp_queue *queue =
-		(struct mlx5e_nvmeotcp_queue *)tcp_ddp_get_ctx(sk);
+	struct mlx5e_nvmeotcp_queue *queue;
 	struct mlx5e_priv *priv = netdev_priv(netdev);
 	struct nvmeotcp_queue_entry *q_entry;
 
+	queue = container_of(tcp_ddp_get_ctx(sk), struct mlx5e_nvmeotcp_queue, tcp_ddp_ctx);
 	q_entry  = &queue->ccid_table[ddp->command_id];
 	WARN_ON(q_entry->sgl_length == 0);
 
@@ -811,6 +835,11 @@ static void
 mlx5e_nvmeotcp_dev_resync(struct net_device *netdev,
 			  struct sock *sk, u32 seq)
 {
+	struct mlx5e_nvmeotcp_queue *queue =
+		container_of(tcp_ddp_get_ctx(sk), struct mlx5e_nvmeotcp_queue, tcp_ddp_ctx);
+
+	queue->after_resync_cqe = 1;
+	mlx5e_nvmeotcp_rx_post_static_params_wqe(queue, seq);
 }
 
 static const struct tcp_ddp_dev_ops mlx5e_nvmeotcp_ops = {
-- 
2.24.1