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nvme-rdma: wait for local invalidation before completing a request 

We must not complete a request before the host memory region is
invalidated.  Luckily we have send with invalidate protocol support so
we usually don't need to execute it, but in case the target did not
invalidate a memory region for us, we must wait for the invalidation to
complete before unmapping host memory and completing the I/O.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
hifive-unleashed-5.1
Sagi Grimberg 2017-11-23 17:35:23 +02:00 committed by Christoph Hellwig
parent 4af7f7ff92
commit 2f122e4f51
1 changed files with 24 additions and 15 deletions
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39
drivers/nvme/host/rdma.c
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@ -1019,8 +1019,18 @@ static void nvme_rdma_memreg_done(struct ib_cq *cq, struct ib_wc *wc)
static void nvme_rdma_inv_rkey_done(struct ib_cq *cq, struct ib_wc *wc)
{
if (unlikely(wc->status != IB_WC_SUCCESS))
struct nvme_rdma_request *req =
container_of(wc->wr_cqe, struct nvme_rdma_request, reg_cqe);
struct request *rq = blk_mq_rq_from_pdu(req);
if (unlikely(wc->status != IB_WC_SUCCESS)) {
nvme_rdma_wr_error(cq, wc, "LOCAL_INV");
return;
}
if (refcount_dec_and_test(&req->ref))
nvme_end_request(rq, req->status, req->result);
}
static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
@ -1031,7 +1041,7 @@ static int nvme_rdma_inv_rkey(struct nvme_rdma_queue *queue,
.opcode = IB_WR_LOCAL_INV,
.next = NULL,
.num_sge = 0,
.send_flags = 0,
.send_flags = IB_SEND_SIGNALED,
.ex.invalidate_rkey = req->mr->rkey,
};
@ -1045,24 +1055,12 @@ static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue,
struct request *rq)
{
struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq);
struct nvme_rdma_ctrl *ctrl = queue->ctrl;
struct nvme_rdma_device *dev = queue->device;
struct ib_device *ibdev = dev->dev;
int res;
if (!blk_rq_bytes(rq))
return;
if (req->mr->need_inval && test_bit(NVME_RDMA_Q_LIVE, &req->queue->flags)) {
res = nvme_rdma_inv_rkey(queue, req);
if (unlikely(res < 0)) {
dev_err(ctrl->ctrl.device,
"Queueing INV WR for rkey %#x failed (%d)\n",
req->mr->rkey, res);
nvme_rdma_error_recovery(queue->ctrl);
}
}
ib_dma_unmap_sg(ibdev, req->sg_table.sgl,
req->nents, rq_data_dir(rq) ==
WRITE ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
@ -1337,8 +1335,19 @@ static int nvme_rdma_process_nvme_rsp(struct nvme_rdma_queue *queue,
req->result = cqe->result;
if ((wc->wc_flags & IB_WC_WITH_INVALIDATE) &&
wc->ex.invalidate_rkey == req->mr->rkey)
wc->ex.invalidate_rkey == req->mr->rkey) {
req->mr->need_inval = false;
} else if (req->mr->need_inval) {
ret = nvme_rdma_inv_rkey(queue, req);
if (unlikely(ret < 0)) {
dev_err(queue->ctrl->ctrl.device,
"Queueing INV WR for rkey %#x failed (%d)\n",
req->mr->rkey, ret);
nvme_rdma_error_recovery(queue->ctrl);
}
/* the local invalidation completion will end the request */
return 0;
}
if (refcount_dec_and_test(&req->ref)) {
if (rq->tag == tag)