From: Sagi Grimberg Date: Tue, 13 Oct 2015 16:11:38 +0000 (+0300) Subject: IB/srp: Split srp_map_sg X-Git-Tag: firefly_0821_release~176^2~755^2~14 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=26630e8a09b72e8783e8963781d39e7edb2a60b9;p=firefly-linux-kernel-4.4.55.git IB/srp: Split srp_map_sg This is a preparation patch for the new registration API conversion. It splits srp_map_sg per registration strategy (srp_map_sg[fmr|fr|dma]. On its own it adds some code duplication, but it makes the API switch easier to comprehend. Signed-off-by: Sagi Grimberg Tested-by: Bart Van Assche Signed-off-by: Doug Ledford --- diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index 235f9b8b27f1..ef1575d11a4b 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -1286,6 +1286,17 @@ static int srp_map_finish_fmr(struct srp_map_state *state, if (state->fmr.next >= state->fmr.end) return -ENOMEM; + WARN_ON_ONCE(!dev->use_fmr); + + if (state->npages == 0) + return 0; + + if (state->npages == 1 && target->global_mr) { + srp_map_desc(state, state->base_dma_addr, state->dma_len, + target->global_mr->rkey); + goto reset_state; + } + fmr = ib_fmr_pool_map_phys(ch->fmr_pool, state->pages, state->npages, io_addr); if (IS_ERR(fmr)) @@ -1297,6 +1308,10 @@ static int srp_map_finish_fmr(struct srp_map_state *state, srp_map_desc(state, state->base_dma_addr & ~dev->mr_page_mask, state->dma_len, fmr->fmr->rkey); +reset_state: + state->npages = 0; + state->dma_len = 0; + return 0; } @@ -1309,10 +1324,22 @@ static int srp_map_finish_fr(struct srp_map_state *state, struct ib_fast_reg_wr wr; struct srp_fr_desc *desc; u32 rkey; + int err; if (state->fr.next >= state->fr.end) return -ENOMEM; + WARN_ON_ONCE(!dev->use_fast_reg); + + if (state->npages == 0) + return 0; + + if (state->npages == 1 && target->global_mr) { + srp_map_desc(state, state->base_dma_addr, state->dma_len, + target->global_mr->rkey); + goto reset_state; + } + desc = srp_fr_pool_get(ch->fr_pool); if (!desc) return -ENOMEM; @@ -1342,7 +1369,15 @@ static int srp_map_finish_fr(struct srp_map_state *state, srp_map_desc(state, state->base_dma_addr, state->dma_len, desc->mr->rkey); - return ib_post_send(ch->qp, &wr.wr, &bad_wr); + err = ib_post_send(ch->qp, &wr.wr, &bad_wr); + if (err) + return err; + +reset_state: + state->npages = 0; + state->dma_len = 0; + + return 0; } static int srp_finish_mapping(struct srp_map_state *state, @@ -1350,26 +1385,9 @@ static int srp_finish_mapping(struct srp_map_state *state, { struct srp_target_port *target = ch->target; struct srp_device *dev = target->srp_host->srp_dev; - int ret = 0; - WARN_ON_ONCE(!dev->use_fast_reg && !dev->use_fmr); - - if (state->npages == 0) - return 0; - - if (state->npages == 1 && target->global_mr) - srp_map_desc(state, state->base_dma_addr, state->dma_len, - target->global_mr->rkey); - else - ret = dev->use_fast_reg ? srp_map_finish_fr(state, ch) : - srp_map_finish_fmr(state, ch); - - if (ret == 0) { - state->npages = 0; - state->dma_len = 0; - } - - return ret; + return dev->use_fast_reg ? srp_map_finish_fr(state, ch) : + srp_map_finish_fmr(state, ch); } static int srp_map_sg_entry(struct srp_map_state *state, @@ -1415,47 +1433,79 @@ static int srp_map_sg_entry(struct srp_map_state *state, return ret; } -static int srp_map_sg(struct srp_map_state *state, struct srp_rdma_ch *ch, - struct srp_request *req, struct scatterlist *scat, - int count) +static int srp_map_sg_fmr(struct srp_map_state *state, struct srp_rdma_ch *ch, + struct srp_request *req, struct scatterlist *scat, + int count) { - struct srp_target_port *target = ch->target; - struct srp_device *dev = target->srp_host->srp_dev; struct scatterlist *sg; int i, ret; - state->desc = req->indirect_desc; - state->pages = req->map_page; - if (dev->use_fast_reg) { - state->fr.next = req->fr_list; - state->fr.end = req->fr_list + target->cmd_sg_cnt; - } else if (dev->use_fmr) { - state->fmr.next = req->fmr_list; - state->fmr.end = req->fmr_list + target->cmd_sg_cnt; + state->desc = req->indirect_desc; + state->pages = req->map_page; + state->fmr.next = req->fmr_list; + state->fmr.end = req->fmr_list + ch->target->cmd_sg_cnt; + + for_each_sg(scat, sg, count, i) { + ret = srp_map_sg_entry(state, ch, sg, i); + if (ret) + return ret; } - if (dev->use_fast_reg || dev->use_fmr) { - for_each_sg(scat, sg, count, i) { - ret = srp_map_sg_entry(state, ch, sg, i); - if (ret) - goto out; - } - ret = srp_finish_mapping(state, ch); + ret = srp_finish_mapping(state, ch); + if (ret) + return ret; + + req->nmdesc = state->nmdesc; + + return 0; +} + +static int srp_map_sg_fr(struct srp_map_state *state, struct srp_rdma_ch *ch, + struct srp_request *req, struct scatterlist *scat, + int count) +{ + struct scatterlist *sg; + int i, ret; + + state->desc = req->indirect_desc; + state->pages = req->map_page; + state->fmr.next = req->fmr_list; + state->fmr.end = req->fmr_list + ch->target->cmd_sg_cnt; + + for_each_sg(scat, sg, count, i) { + ret = srp_map_sg_entry(state, ch, sg, i); if (ret) - goto out; - } else { - for_each_sg(scat, sg, count, i) { - srp_map_desc(state, ib_sg_dma_address(dev->dev, sg), - ib_sg_dma_len(dev->dev, sg), - target->global_mr->rkey); - } + return ret; } + ret = srp_finish_mapping(state, ch); + if (ret) + return ret; + req->nmdesc = state->nmdesc; - ret = 0; -out: - return ret; + return 0; +} + +static int srp_map_sg_dma(struct srp_map_state *state, struct srp_rdma_ch *ch, + struct srp_request *req, struct scatterlist *scat, + int count) +{ + struct srp_target_port *target = ch->target; + struct srp_device *dev = target->srp_host->srp_dev; + struct scatterlist *sg; + int i; + + state->desc = req->indirect_desc; + for_each_sg(scat, sg, count, i) { + srp_map_desc(state, ib_sg_dma_address(dev->dev, sg), + ib_sg_dma_len(dev->dev, sg), + target->global_mr->rkey); + } + + req->nmdesc = state->nmdesc; + + return 0; } /* @@ -1563,7 +1613,12 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch, target->indirect_size, DMA_TO_DEVICE); memset(&state, 0, sizeof(state)); - srp_map_sg(&state, ch, req, scat, count); + if (dev->use_fast_reg) + srp_map_sg_fr(&state, ch, req, scat, count); + else if (dev->use_fmr) + srp_map_sg_fmr(&state, ch, req, scat, count); + else + srp_map_sg_dma(&state, ch, req, scat, count); /* We've mapped the request, now pull as much of the indirect * descriptor table as we can into the command buffer. If this