diff options
| -rw-r--r-- | drivers/nvme/target/fc.c | 48 | ||||
| -rw-r--r-- | include/linux/nvme-fc-driver.h | 2 |
2 files changed, 11 insertions, 39 deletions
diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c index 309c84aa7595..421e43bf1dd7 100644 --- a/drivers/nvme/target/fc.c +++ b/drivers/nvme/target/fc.c @@ -58,7 +58,8 @@ struct nvmet_fc_ls_iod { struct work_struct work; } __aligned(sizeof(unsigned long long)); -#define NVMET_FC_MAX_KB_PER_XFR 256 +#define NVMET_FC_MAX_SEQ_LENGTH (256 * 1024) +#define NVMET_FC_MAX_XFR_SGENTS (NVMET_FC_MAX_SEQ_LENGTH / PAGE_SIZE) enum nvmet_fcp_datadir { NVMET_FCP_NODATA, @@ -74,9 +75,7 @@ struct nvmet_fc_fcp_iod { struct nvme_fc_ersp_iu rspiubuf; dma_addr_t rspdma; struct scatterlist *data_sg; - struct scatterlist *next_sg; int data_sg_cnt; - u32 next_sg_offset; u32 total_length; u32 offset; enum nvmet_fcp_datadir io_dir; @@ -112,6 +111,7 @@ struct nvmet_fc_tgtport { struct ida assoc_cnt; struct nvmet_port *port; struct kref ref; + u32 max_sg_cnt; }; struct nvmet_fc_defer_fcp_req { @@ -994,6 +994,8 @@ nvmet_fc_register_targetport(struct nvmet_fc_port_info *pinfo, INIT_LIST_HEAD(&newrec->assoc_list); kref_init(&newrec->ref); ida_init(&newrec->assoc_cnt); + newrec->max_sg_cnt = min_t(u32, NVMET_FC_MAX_XFR_SGENTS, + template->max_sgl_segments); ret = nvmet_fc_alloc_ls_iodlist(newrec); if (ret) { @@ -1866,51 +1868,23 @@ nvmet_fc_transfer_fcp_data(struct nvmet_fc_tgtport *tgtport, struct nvmet_fc_fcp_iod *fod, u8 op) { struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq; - struct scatterlist *sg, *datasg; unsigned long flags; - u32 tlen, sg_off; + u32 tlen; int ret; fcpreq->op = op; fcpreq->offset = fod->offset; fcpreq->timeout = NVME_FC_TGTOP_TIMEOUT_SEC; - tlen = min_t(u32, (NVMET_FC_MAX_KB_PER_XFR * 1024), + + tlen = min_t(u32, tgtport->max_sg_cnt * PAGE_SIZE, (fod->total_length - fod->offset)); - tlen = min_t(u32, tlen, NVME_FC_MAX_SEGMENTS * PAGE_SIZE); - tlen = min_t(u32, tlen, fod->tgtport->ops->max_sgl_segments - * PAGE_SIZE); fcpreq->transfer_length = tlen; fcpreq->transferred_length = 0; fcpreq->fcp_error = 0; fcpreq->rsplen = 0; - fcpreq->sg_cnt = 0; - - datasg = fod->next_sg; - sg_off = fod->next_sg_offset; - - for (sg = fcpreq->sg ; tlen; sg++) { - *sg = *datasg; - if (sg_off) { - sg->offset += sg_off; - sg->length -= sg_off; - sg->dma_address += sg_off; - sg_off = 0; - } - if (tlen < sg->length) { - sg->length = tlen; - fod->next_sg = datasg; - fod->next_sg_offset += tlen; - } else if (tlen == sg->length) { - fod->next_sg_offset = 0; - fod->next_sg = sg_next(datasg); - } else { - fod->next_sg_offset = 0; - datasg = sg_next(datasg); - } - tlen -= sg->length; - fcpreq->sg_cnt++; - } + fcpreq->sg = &fod->data_sg[fod->offset / PAGE_SIZE]; + fcpreq->sg_cnt = DIV_ROUND_UP(tlen, PAGE_SIZE); /* * If the last READDATA request: check if LLDD supports @@ -2225,8 +2199,6 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, fod->req.sg = fod->data_sg; fod->req.sg_cnt = fod->data_sg_cnt; fod->offset = 0; - fod->next_sg = fod->data_sg; - fod->next_sg_offset = 0; if (fod->io_dir == NVMET_FCP_WRITE) { /* pull the data over before invoking nvmet layer */ diff --git a/include/linux/nvme-fc-driver.h b/include/linux/nvme-fc-driver.h index 2591878c1d48..9c5cb4480806 100644 --- a/include/linux/nvme-fc-driver.h +++ b/include/linux/nvme-fc-driver.h @@ -624,7 +624,7 @@ struct nvmefc_tgt_fcp_req { u32 timeout; u32 transfer_length; struct fc_ba_rjt ba_rjt; - struct scatterlist sg[NVME_FC_MAX_SEGMENTS]; + struct scatterlist *sg; int sg_cnt; void *rspaddr; dma_addr_t rspdma; |