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Tue, 05 Jan 2021 16:35:39 -0800 (PST) Subject: Re: [PATCH 1/2] nvme: support fused nvme requests To: klayph@gmail.com, linux-nvme@lists.infradead.org References: <20210105224939.1336-1-clay.mayers@kioxia.com> <20210105224939.1336-2-clay.mayers@kioxia.com> From: James Smart Message-ID: Date: Tue, 5 Jan 2021 16:35:33 -0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <20210105224939.1336-2-clay.mayers@kioxia.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210105_193544_936747_92E08691 X-CRM114-Status: GOOD ( 20.04 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Keith Busch , Jens Axboe , Christoph Hellwig , Sagi Grimberg Content-Type: multipart/mixed; boundary="===============7735353418968851755==" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org --===============7735353418968851755== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000b52fd605b8308036" --000000000000b52fd605b8308036 Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: quoted-printable Content-Language: en-US On 1/5/2021 2:49 PM, klayph@gmail.com wrote: > From > =20 > /* > diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c > index 3be352403839..c24729e100bc 100644 > --- a/drivers/nvme/host/pci.c > +++ b/drivers/nvme/host/pci.c > @@ -491,6 +491,30 @@ static inline void nvme_write_sq_db(struct nvme_queu= e *nvmeq, bool write_sq) > nvmeq->last_sq_tail =3D nvmeq->sq_tail; > } > =20 > +/** > + * nvme_submit_cmd2() - Copy fused commands into a queue and ring the do= orbell > + * @nvmeq: The queue to use > + * @cmd: The first command to send > + * @cmd2: the second command to send > + * @write_sq: whether to write to the SQ doorbell > + */ > +static void nvme_submit_cmd2(struct nvme_queue *nvmeq, struct nvme_comma= nd *cmd, > + struct nvme_command *cmd2, bool write_sq) > +{ > + spin_lock(&nvmeq->sq_lock); > + memcpy(nvmeq->sq_cmds + (nvmeq->sq_tail << nvmeq->sqes), > + cmd, sizeof(*cmd)); > + if (++nvmeq->sq_tail =3D=3D nvmeq->q_depth) > + nvmeq->sq_tail =3D 0; > + memcpy(nvmeq->sq_cmds + (nvmeq->sq_tail << nvmeq->sqes), > + cmd2, sizeof(*cmd2)); > + if (++nvmeq->sq_tail =3D=3D nvmeq->q_depth) > + nvmeq->sq_tail =3D 0; > + nvme_write_sq_db(nvmeq, write_sq); > + spin_unlock(&nvmeq->sq_lock); > +} > + > + > /** > * nvme_submit_cmd() - Copy a command into a queue and ring the doorbel= l > * @nvmeq: The queue to use > @@ -918,7 +942,13 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_c= tx *hctx, > } > =20 > blk_mq_start_request(req); > - nvme_submit_cmd(nvmeq, &cmnd, bd->last); > + > + if (cmnd.common.flags & NVME_CMD_FUSE_FIRST) > + memcpy(&nvme_req(req)->nrq2->cmnd, &cmnd, sizeof(cmnd)); > + else if (cmnd.common.flags & NVME_CMD_FUSE_SECOND) > + nvme_submit_cmd2(nvmeq, &nvme_req(req)->cmnd, &cmnd, bd->last); > + else > + nvme_submit_cmd(nvmeq, &cmnd, bd->last); > return BLK_STS_OK; > out_unmap_data: > nvme_unmap_data(dev, req); I think Keith caught the most concerning issue. I've been thinking of=20 others but they mostly seem to work.=C2=A0 I assume recopies of the first= =20 fused cmd to the data structure don't hurt.=C2=A0 I would expect there to b= e=20 a couple of other odd issues if the two requests start working=20 independently. This is the pci transport only. You should either put something in to=20 not allow the ioctl on a non-pci transport, or add the support (or=20 rejection) to the fabric transports as well. -- james --=20 This electronic communication and the information and any files transmitted= =20 with it, or attached to it, are confidential and are intended solely for=20 the use of the individual or entity to whom it is addressed and may contain= =20 information that is confidential, legally privileged, protected by privacy= =20 laws, or otherwise restricted from disclosure to anyone else. If you are=20 not the intended recipient or the person responsible for delivering the=20 e-mail to the intended recipient, you are hereby notified that any use,=20 copying, distributing, dissemination, forwarding, printing, or copying of= =20 this e-mail is strictly prohibited. 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