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Re: [PATCH v2 14/20] nvme: allow multiple aios per command
From: |
Klaus Birkelund |
Subject: |
Re: [PATCH v2 14/20] nvme: allow multiple aios per command |
Date: |
Thu, 21 Nov 2019 12:57:51 +0100 |
User-agent: |
Mutt/1.12.2 (2019-09-21) |
On Tue, Nov 12, 2019 at 03:25:06PM +0000, Beata Michalska wrote:
> Hi Klaus,
>
> On Tue, 15 Oct 2019 at 11:55, Klaus Jensen <address@hidden> wrote:
> > @@ -341,19 +344,18 @@ static uint16_t nvme_dma_write_prp(NvmeCtrl *n,
> > uint8_t *ptr, uint32_t len,
> Any reason why the nvme_dma_write_prp is missing the changes applied
> to nvme_dma_read_prp ?
>
This was adressed by proxy through changes to the previous patch
(by combining the read/write functions).
> > + case NVME_AIO_OPC_WRITE_ZEROES:
> > + block_acct_start(stats, acct, aio->iov.size, BLOCK_ACCT_WRITE);
> > + aio->aiocb = blk_aio_pwrite_zeroes(aio->blk, aio->offset,
> > + aio->iov.size, BDRV_REQ_MAY_UNMAP, nvme_aio_cb, aio);
> Minor: aio->blk => blk
>
Thanks. Fixed this in a couple of other places as well.
> > @@ -621,8 +880,11 @@ static uint16_t nvme_del_sq(NvmeCtrl *n, NvmeCmd *cmd)
> > sq = n->sq[qid];
> > while (!QTAILQ_EMPTY(&sq->out_req_list)) {
> > req = QTAILQ_FIRST(&sq->out_req_list);
> > - assert(req->aiocb);
> > - blk_aio_cancel(req->aiocb);
> > + while (!QTAILQ_EMPTY(&req->aio_tailq)) {
> > + aio = QTAILQ_FIRST(&req->aio_tailq);
> > + assert(aio->aiocb);
> > + blk_aio_cancel(aio->aiocb);
> What about releasing memory associated with given aio ?
I believe the callback is still called when cancelled? That should take
care of it. Or have I misunderstood that? At least for the DMAAIOCBs it
is.
> > +struct NvmeAIO {
> > + NvmeRequest *req;
> > +
> > + NvmeAIOOp opc;
> > + int64_t offset;
> > + BlockBackend *blk;
> > + BlockAIOCB *aiocb;
> > + BlockAcctCookie acct;
> > +
> > + NvmeAIOCompletionFunc *cb;
> > + void *cb_arg;
> > +
> > + QEMUSGList *qsg;
> > + QEMUIOVector iov;
>
> There is a bit of inconsistency on the ownership of IOVs and SGLs.
> SGLs now seem to be owned by request whereas IOVs by the aio.
> WOuld be good to have that unified or documented at least.
>
Fixed this. The NvmeAIO only holds pointers now.
> > +#define NVME_REQ_TRANSFER_DMA 0x1
> This one does not seem to be used ....
>
I have dropped the flags and reverted to a simple req->is_cmb as that is
all that is really needed.