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Date: Thu, 22 Aug 2019 02:06:52 +0200 From: Christoph Hellwig <hch@....de> To: Marta Rybczynska <mrybczyn@...ray.eu> Cc: kbusch@...nel.org, axboe@...com, hch@....de, sagi@...mberg.me, linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org, Samuel Jones <sjones@...ray.eu>, Guillaume Missonnier <gmissonnier@...ray.eu> Subject: Re: [PATCH v2] nvme: allow 64-bit results in passthru commands On Fri, Aug 16, 2019 at 11:47:21AM +0200, Marta Rybczynska wrote: > It is not possible to get 64-bit results from the passthru commands, > what prevents from getting for the Capabilities (CAP) property value. > > As a result, it is not possible to implement IOL's NVMe Conformance > test 4.3 Case 1 for Fabrics targets [1] (page 123). > > This issue has been already discussed [2], but without a solution. > > This patch solves the problem by adding new ioctls with a new > passthru structure, including 64-bit results. The older ioctls stay > unchanged. Ok, with my idea not being suitable I think I'm fine with this approach, a little nitpick below: > +static bool is_admin_cmd(unsigned int cmd) > +{ > + if ((cmd == NVME_IOCTL_ADMIN_CMD) || (cmd == NVME_IOCTL_ADMIN64_CMD)) > + return true; > + return false; > +} No need for the inner braces. But I'm actually not sure the current code structure is very suitable for extending it. > + > static int nvme_ioctl(struct block_device *bdev, fmode_t mode, > unsigned int cmd, unsigned long arg) > { > @@ -1418,13 +1473,13 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode, > * seperately and drop the ns SRCU reference early. This avoids a > * deadlock when deleting namespaces using the passthrough interface. > */ > - if (cmd == NVME_IOCTL_ADMIN_CMD || is_sed_ioctl(cmd)) { > + if (is_admin_cmd(cmd) || is_sed_ioctl(cmd)) { So maybe for this check we should have a is_ctrl_iocl() helper instead that includes the is_sed_ioctl check. > struct nvme_ctrl *ctrl = ns->ctrl; > > nvme_get_ctrl(ns->ctrl); > nvme_put_ns_from_disk(head, srcu_idx); > > - if (cmd == NVME_IOCTL_ADMIN_CMD) > + if (is_admin_cmd(cmd)) > ret = nvme_user_cmd(ctrl, NULL, argp); > else > ret = sed_ioctl(ctrl->opal_dev, cmd, argp); And then we can move this whole branch into a helper function, which then switches on the ioctl cmd, with sed_ioctl as the fallback.
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