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

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[ Upstream commit 748ff8408f ]

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

Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Parav Pandit
2017-01-19 09:55:08 -06:00
committed by Greg Kroah-Hartman
parent 5a0d41409b
commit 6149abe7f4
1 changed files with 17 additions and 0 deletions
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17
drivers/nvme/target/rdma.c
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@@ -438,6 +438,10 @@ static int nvmet_rdma_post_recv(struct nvmet_rdma_device *ndev,
{
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(struct nvmet_req *req)
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(struct nvmet_rdma_queue *queue,
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;