Patch "nvmet-rdma: Fix missing dma sync to nvme data structures" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

nvmet-rdma: Fix missing dma sync to nvme data structures

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
nvmet-rdma-fix-missing-dma-sync-to-nvme-data-structures.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Parav Pandit <[email protected]>
Date: Thu, 19 Jan 2017 09:55:08 -0600
Subject: nvmet-rdma: Fix missing dma sync to nvme data structures

From: Parav Pandit <[email protected]>

[ Upstream commit 748ff8408f8e208f279ba221e5c12612fbb4dddb ]

This patch performs dma sync operations on nvme_command and nvme_completion.

nvme_command is synced
(a) on receiving of the recv queue completion for cpu access.
(b) before posting recv wqe back to rdma adapter for device access.

nvme_completion is synced
(a) on receiving of the recv queue completion of associated nvme_command for cpu access.
(b) before posting send wqe to rdma adapter for device access.

This patch is generated for git://git.infradead.org/nvme-fabrics.git
Branch: nvmf-4.10

---
 drivers/nvme/target/rdma.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

@@ -438,6 +438,10 @@ static int nvmet_rdma_post_recv(struct n
 {
 	struct ib_recv_wr *bad_wr;
 
+	ib_dma_sync_single_for_device(ndev->device,
+		cmd->sge[0].addr, cmd->sge[0].length,
+		DMA_FROM_DEVICE);
+
 	if (ndev->srq)
 		return ib_post_srq_recv(ndev->srq, &cmd->wr, &bad_wr);
 	return ib_post_recv(cmd->queue->cm_id->qp, &cmd->wr, &bad_wr);

@@ -538,6 +542,11 @@ static void nvmet_rdma_queue_response(st
 		first_wr = &rsp->send_wr;
 
 	nvmet_rdma_post_recv(rsp->queue->dev, rsp->cmd);
+
+	ib_dma_sync_single_for_device(rsp->queue->dev->device,
+		rsp->send_sge.addr, rsp->send_sge.length,
+		DMA_TO_DEVICE);
+
 	if (ib_post_send(cm_id->qp, first_wr, &bad_wr)) {
 		pr_err("sending cmd response failed\n");
 		nvmet_rdma_release_rsp(rsp);

@@ -698,6 +707,14 @@ static void nvmet_rdma_handle_command(st
 	cmd->n_rdma = 0;
 	cmd->req.port = queue->port;
 
+
+	ib_dma_sync_single_for_cpu(queue->dev->device,
+		cmd->cmd->sge[0].addr, cmd->cmd->sge[0].length,
+		DMA_FROM_DEVICE);
+	ib_dma_sync_single_for_cpu(queue->dev->device,
+		cmd->send_sge.addr, cmd->send_sge.length,
+		DMA_TO_DEVICE);
+
 	if (!nvmet_req_init(&cmd->req, &queue->nvme_cq,
 			&queue->nvme_sq, &nvmet_rdma_ops))
 		return;

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/nvmet-rdma-fix-missing-dma-sync-to-nvme-data-structures.patch