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Mon, 05 Oct 2020 10:37:13 -0700 (PDT) Subject: Re: [PATCH 4/7] nvmet-fc: use feature flag for virtual LLDD To: Hannes Reinecke , Christoph Hellwig References: <20200922121501.32851-1-hare@suse.de> <20200922121501.32851-5-hare@suse.de> From: James Smart Message-ID: <990c02ea-0b84-5301-0d0d-e75556df02b7@broadcom.com> Date: Mon, 5 Oct 2020 10:37:11 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.2.2 MIME-Version: 1.0 In-Reply-To: <20200922121501.32851-5-hare@suse.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201005_133717_344516_AC8D8957 X-CRM114-Status: GOOD ( 26.47 ) 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: linux-nvme@lists.infradead.org, Sagi Grimberg , Keith Busch Content-Type: multipart/mixed; boundary="===============4071336743126489245==" Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org --===============4071336743126489245== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000e0aa9105b0efeec9" --000000000000e0aa9105b0efeec9 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US On 9/22/2020 5:14 AM, Hannes Reinecke wrote: > Virtual LLDDs like fcloop don't need to do DMA, but still > might want to expose a device. So add a new feature flag > to mark these LLDDs instead of relying on a non-existing > struct device. > > Signed-off-by: Hannes Reinecke > --- > drivers/nvme/target/fc.c | 93 +++++++++++++++++++++++------------------- > drivers/nvme/target/fcloop.c | 2 +- > include/linux/nvme-fc-driver.h | 2 + > 3 files changed, 55 insertions(+), 42 deletions(-) > > diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c > index 63f5deb3b68a..6f5784767d35 100644 > --- a/drivers/nvme/target/fc.c > +++ b/drivers/nvme/target/fc.c > @@ -273,41 +273,50 @@ static void nvmet_fc_xmt_ls_rsp(struct nvmet_fc_tgtport *tgtport, > * in the scatter list, setting all dma addresses to 0. > */ > > +static bool fc_lldd_is_virtual(struct nvmet_fc_tgtport *tgtport) > +{ > + return !!(tgtport->ops->target_features & NVMET_FCTGTFEAT_VIRTUAL_DMA); > +} > + > static inline dma_addr_t > -fc_dma_map_single(struct device *dev, void *ptr, size_t size, > +fc_dma_map_single(struct nvmet_fc_tgtport *tgtport, void *ptr, size_t size, > enum dma_data_direction dir) > { > - return dev ? dma_map_single(dev, ptr, size, dir) : (dma_addr_t)0L; > + if (fc_lldd_is_virtual(tgtport)) > + return (dma_addr_t)0L; > + return dma_map_single(tgtport->dev, ptr, size, dir); > } > > static inline int > -fc_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) > +fc_dma_mapping_error(struct nvmet_fc_tgtport *tgtport, dma_addr_t dma_addr) > { > - return dev ? dma_mapping_error(dev, dma_addr) : 0; > + if (fc_lldd_is_virtual(tgtport)) > + return 0; > + return dma_mapping_error(tgtport->dev, dma_addr); > } > > static inline void > -fc_dma_unmap_single(struct device *dev, dma_addr_t addr, size_t size, > - enum dma_data_direction dir) > +fc_dma_unmap_single(struct nvmet_fc_tgtport *tgtport, dma_addr_t addr, > + size_t size, enum dma_data_direction dir) > { > - if (dev) > - dma_unmap_single(dev, addr, size, dir); > + if (!fc_lldd_is_virtual(tgtport)) > + dma_unmap_single(tgtport->dev, addr, size, dir); > } > > static inline void > -fc_dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, > - enum dma_data_direction dir) > +fc_dma_sync_single_for_cpu(struct nvmet_fc_tgtport *tgtport, dma_addr_t addr, > + size_t size, enum dma_data_direction dir) > { > - if (dev) > - dma_sync_single_for_cpu(dev, addr, size, dir); > + if (!fc_lldd_is_virtual(tgtport)) > + dma_sync_single_for_cpu(tgtport->dev, addr, size, dir); > } > > static inline void > -fc_dma_sync_single_for_device(struct device *dev, dma_addr_t addr, size_t size, > - enum dma_data_direction dir) > +fc_dma_sync_single_for_device(struct nvmet_fc_tgtport *tgtport, dma_addr_t addr, > + size_t size, enum dma_data_direction dir) > { > - if (dev) > - dma_sync_single_for_device(dev, addr, size, dir); > + if (!fc_lldd_is_virtual(tgtport)) > + dma_sync_single_for_device(tgtport->dev, addr, size, dir); > } > > /* pseudo dma_map_sg call */ > @@ -329,18 +338,20 @@ fc_map_sg(struct scatterlist *sg, int nents) > } > > static inline int > -fc_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, > - enum dma_data_direction dir) > +fc_dma_map_sg(struct nvmet_fc_tgtport *tgtport, struct scatterlist *sg, > + int nents, enum dma_data_direction dir) > { > - return dev ? dma_map_sg(dev, sg, nents, dir) : fc_map_sg(sg, nents); > + if (fc_lldd_is_virtual(tgtport)) > + return fc_map_sg(sg, nents); > + return dma_map_sg(tgtport->dev, sg, nents, dir); > } > > static inline void > -fc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, > - enum dma_data_direction dir) > +fc_dma_unmap_sg(struct nvmet_fc_tgtport *tgtport, struct scatterlist *sg, > + int nents, enum dma_data_direction dir) > { > - if (dev) > - dma_unmap_sg(dev, sg, nents, dir); > + if (!fc_lldd_is_virtual(tgtport)) > + dma_unmap_sg(tgtport->dev, sg, nents, dir); > } > > > @@ -368,7 +379,7 @@ __nvmet_fc_finish_ls_req(struct nvmet_fc_ls_req_op *lsop) > > spin_unlock_irqrestore(&tgtport->lock, flags); > > - fc_dma_unmap_single(tgtport->dev, lsreq->rqstdma, > + fc_dma_unmap_single(tgtport, lsreq->rqstdma, > (lsreq->rqstlen + lsreq->rsplen), > DMA_BIDIRECTIONAL); > > @@ -391,10 +402,10 @@ __nvmet_fc_send_ls_req(struct nvmet_fc_tgtport *tgtport, > lsop->req_queued = false; > INIT_LIST_HEAD(&lsop->lsreq_list); > > - lsreq->rqstdma = fc_dma_map_single(tgtport->dev, lsreq->rqstaddr, > + lsreq->rqstdma = fc_dma_map_single(tgtport, lsreq->rqstaddr, > lsreq->rqstlen + lsreq->rsplen, > DMA_BIDIRECTIONAL); > - if (fc_dma_mapping_error(tgtport->dev, lsreq->rqstdma)) > + if (fc_dma_mapping_error(tgtport, lsreq->rqstdma)) > return -EFAULT; > > lsreq->rspdma = lsreq->rqstdma + lsreq->rqstlen; > @@ -420,7 +431,7 @@ __nvmet_fc_send_ls_req(struct nvmet_fc_tgtport *tgtport, > lsop->req_queued = false; > list_del(&lsop->lsreq_list); > spin_unlock_irqrestore(&tgtport->lock, flags); > - fc_dma_unmap_single(tgtport->dev, lsreq->rqstdma, > + fc_dma_unmap_single(tgtport, lsreq->rqstdma, > (lsreq->rqstlen + lsreq->rsplen), > DMA_BIDIRECTIONAL); > return ret; > @@ -555,10 +566,10 @@ nvmet_fc_alloc_ls_iodlist(struct nvmet_fc_tgtport *tgtport) > > iod->rspbuf = (union nvmefc_ls_responses *)&iod->rqstbuf[1]; > > - iod->rspdma = fc_dma_map_single(tgtport->dev, iod->rspbuf, > + iod->rspdma = fc_dma_map_single(tgtport, iod->rspbuf, > sizeof(*iod->rspbuf), > DMA_TO_DEVICE); > - if (fc_dma_mapping_error(tgtport->dev, iod->rspdma)) > + if (fc_dma_mapping_error(tgtport, iod->rspdma)) > goto out_fail; > } > > @@ -568,7 +579,7 @@ nvmet_fc_alloc_ls_iodlist(struct nvmet_fc_tgtport *tgtport) > kfree(iod->rqstbuf); > list_del(&iod->ls_rcv_list); > for (iod--, i--; i >= 0; iod--, i--) { > - fc_dma_unmap_single(tgtport->dev, iod->rspdma, > + fc_dma_unmap_single(tgtport, iod->rspdma, > sizeof(*iod->rspbuf), DMA_TO_DEVICE); > kfree(iod->rqstbuf); > list_del(&iod->ls_rcv_list); > @@ -586,7 +597,7 @@ nvmet_fc_free_ls_iodlist(struct nvmet_fc_tgtport *tgtport) > int i; > > for (i = 0; i < NVMET_LS_CTX_COUNT; iod++, i++) { > - fc_dma_unmap_single(tgtport->dev, > + fc_dma_unmap_single(tgtport, > iod->rspdma, sizeof(*iod->rspbuf), > DMA_TO_DEVICE); > kfree(iod->rqstbuf); > @@ -640,12 +651,12 @@ nvmet_fc_prep_fcp_iodlist(struct nvmet_fc_tgtport *tgtport, > list_add_tail(&fod->fcp_list, &queue->fod_list); > spin_lock_init(&fod->flock); > > - fod->rspdma = fc_dma_map_single(tgtport->dev, &fod->rspiubuf, > + fod->rspdma = fc_dma_map_single(tgtport, &fod->rspiubuf, > sizeof(fod->rspiubuf), DMA_TO_DEVICE); > - if (fc_dma_mapping_error(tgtport->dev, fod->rspdma)) { > + if (fc_dma_mapping_error(tgtport, fod->rspdma)) { > list_del(&fod->fcp_list); > for (fod--, i--; i >= 0; fod--, i--) { > - fc_dma_unmap_single(tgtport->dev, fod->rspdma, > + fc_dma_unmap_single(tgtport, fod->rspdma, > sizeof(fod->rspiubuf), > DMA_TO_DEVICE); > fod->rspdma = 0L; > @@ -666,7 +677,7 @@ nvmet_fc_destroy_fcp_iodlist(struct nvmet_fc_tgtport *tgtport, > > for (i = 0; i < queue->sqsize; fod++, i++) { > if (fod->rspdma) > - fc_dma_unmap_single(tgtport->dev, fod->rspdma, > + fc_dma_unmap_single(tgtport, fod->rspdma, > sizeof(fod->rspiubuf), DMA_TO_DEVICE); > } > } > @@ -730,7 +741,7 @@ nvmet_fc_free_fcp_iod(struct nvmet_fc_tgt_queue *queue, > struct nvmet_fc_defer_fcp_req *deferfcp; > unsigned long flags; > > - fc_dma_sync_single_for_cpu(tgtport->dev, fod->rspdma, > + fc_dma_sync_single_for_cpu(tgtport, fod->rspdma, > sizeof(fod->rspiubuf), DMA_TO_DEVICE); > > fcpreq->nvmet_fc_private = NULL; > @@ -1925,7 +1936,7 @@ nvmet_fc_xmt_ls_rsp_done(struct nvmefc_ls_rsp *lsrsp) > struct nvmet_fc_ls_iod *iod = lsrsp->nvme_fc_private; > struct nvmet_fc_tgtport *tgtport = iod->tgtport; > > - fc_dma_sync_single_for_cpu(tgtport->dev, iod->rspdma, > + fc_dma_sync_single_for_cpu(tgtport, iod->rspdma, > sizeof(*iod->rspbuf), DMA_TO_DEVICE); > nvmet_fc_free_ls_iod(tgtport, iod); > nvmet_fc_tgtport_put(tgtport); > @@ -1937,7 +1948,7 @@ nvmet_fc_xmt_ls_rsp(struct nvmet_fc_tgtport *tgtport, > { > int ret; > > - fc_dma_sync_single_for_device(tgtport->dev, iod->rspdma, > + fc_dma_sync_single_for_device(tgtport, iod->rspdma, > sizeof(*iod->rspbuf), DMA_TO_DEVICE); > > ret = tgtport->ops->xmt_ls_rsp(&tgtport->fc_target_port, iod->lsrsp); > @@ -2091,7 +2102,7 @@ nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod) > > fod->data_sg = sg; > fod->data_sg_cnt = nent; > - fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport->dev, sg, nent, > + fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport, sg, nent, > ((fod->io_dir == NVMET_FCP_WRITE) ? > DMA_FROM_DEVICE : DMA_TO_DEVICE)); > /* note: write from initiator perspective */ > @@ -2109,7 +2120,7 @@ nvmet_fc_free_tgt_pgs(struct nvmet_fc_fcp_iod *fod) > if (!fod->data_sg || !fod->data_sg_cnt) > return; > > - fc_dma_unmap_sg(fod->tgtport->dev, fod->data_sg, fod->data_sg_cnt, > + fc_dma_unmap_sg(fod->tgtport, fod->data_sg, fod->data_sg_cnt, > ((fod->io_dir == NVMET_FCP_WRITE) ? > DMA_FROM_DEVICE : DMA_TO_DEVICE)); > sgl_free(fod->data_sg); > @@ -2193,7 +2204,7 @@ nvmet_fc_prep_fcp_rsp(struct nvmet_fc_tgtport *tgtport, > fod->fcpreq->rsplen = sizeof(*ersp); > } > > - fc_dma_sync_single_for_device(tgtport->dev, fod->rspdma, > + fc_dma_sync_single_for_device(tgtport, fod->rspdma, > sizeof(fod->rspiubuf), DMA_TO_DEVICE); > } > > diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c > index e56f323fa7d4..2ccb941efb21 100644 > --- a/drivers/nvme/target/fcloop.c > +++ b/drivers/nvme/target/fcloop.c > @@ -1043,7 +1043,7 @@ static struct nvmet_fc_target_template tgttemplate = { > .max_dif_sgl_segments = FCLOOP_SGL_SEGS, > .dma_boundary = FCLOOP_DMABOUND_4G, > /* optional features */ > - .target_features = 0, > + .target_features = NVMET_FCTGTFEAT_VIRTUAL_DMA, > /* sizes of additional private data for data structures */ > .target_priv_sz = sizeof(struct fcloop_tport), > .lsrqst_priv_sz = sizeof(struct fcloop_lsreq), > diff --git a/include/linux/nvme-fc-driver.h b/include/linux/nvme-fc-driver.h > index 2a38f2b477a5..675c7ef6df17 100644 > --- a/include/linux/nvme-fc-driver.h > +++ b/include/linux/nvme-fc-driver.h > @@ -707,6 +707,8 @@ enum { > * sequence in one LLDD operation. Errors during Data > * sequence transmit must not allow RSP sequence to be sent. > */ > + NVMET_FCTGTFEAT_VIRTUAL_DMA = (1 << 1), > + /* Bit 1: Virtual LLDD with no DMA support */ > }; > > Ok. 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