IB/srp: use IB_PD_UNSAFE_GLOBAL_RKEY

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 579b8ae..5ed1e88 100644 (file)
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1262,6 +1262,7 @@ static int srp_map_finish_fmr(struct srp_map_state *state,
 {
        struct srp_target_port *target = ch->target;
        struct srp_device *dev = target->srp_host->srp_dev;
+       struct ib_pd *pd = target->pd;
        struct ib_pool_fmr *fmr;
        u64 io_addr = 0;
 
@@ -1273,9 +1274,9 @@ static int srp_map_finish_fmr(struct srp_map_state *state,
        if (state->npages == 0)
                return 0;
 
-       if (state->npages == 1 && target->global_mr) {
+       if (state->npages == 1 && (pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)) {
                srp_map_desc(state, state->base_dma_addr, state->dma_len,
-                            target->global_mr->rkey);
+                            pd->unsafe_global_rkey);
                goto reset_state;
        }
 
@@ -1315,6 +1316,7 @@ static int srp_map_finish_fr(struct srp_map_state *state,
 {
        struct srp_target_port *target = ch->target;
        struct srp_device *dev = target->srp_host->srp_dev;
+       struct ib_pd *pd = target->pd;
        struct ib_send_wr *bad_wr;
        struct ib_reg_wr wr;
        struct srp_fr_desc *desc;
@@ -1326,12 +1328,12 @@ static int srp_map_finish_fr(struct srp_map_state *state,
 
        WARN_ON_ONCE(!dev->use_fast_reg);
 
-       if (sg_nents == 1 && target->global_mr) {
+       if (sg_nents == 1 && (pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)) {
                unsigned int sg_offset = sg_offset_p ? *sg_offset_p : 0;
 
                srp_map_desc(state, sg_dma_address(state->sg) + sg_offset,
                             sg_dma_len(state->sg) - sg_offset,
-                            target->global_mr->rkey);
+                            pd->unsafe_global_rkey);
                if (sg_offset_p)
                        *sg_offset_p = 0;
                return 1;
@@ -1491,7 +1493,7 @@ static int srp_map_sg_dma(struct srp_map_state *state, struct srp_rdma_ch *ch,
        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);
+                            target->pd->unsafe_global_rkey);
        }
 
        return 0;
@@ -1591,6 +1593,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
                        struct srp_request *req)
 {
        struct srp_target_port *target = ch->target;
+       struct ib_pd *pd = target->pd;
        struct scatterlist *scat;
        struct srp_cmd *cmd = req->cmd->buf;
        int len, nents, count, ret;
@@ -1626,7 +1629,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
        fmt = SRP_DATA_DESC_DIRECT;
        len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
 
-       if (count == 1 && target->global_mr) {
+       if (count == 1 && (pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)) {
                /*
                 * The midlayer only generated a single gather/scatter
                 * entry, or DMA mapping coalesced everything to a
@@ -1636,7 +1639,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
                struct srp_direct_buf *buf = (void *) cmd->add_data;
 
                buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
-               buf->key = cpu_to_be32(target->global_mr->rkey);
+               buf->key = cpu_to_be32(pd->unsafe_global_rkey);
                buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
 
                req->nmdesc = 0;
@@ -1709,14 +1712,14 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
        memcpy(indirect_hdr->desc_list, req->indirect_desc,
               count * sizeof (struct srp_direct_buf));
 
-       if (!target->global_mr) {
+       if (!(pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY)) {
                ret = srp_map_idb(ch, req, state.gen.next, state.gen.end,
                                  idb_len, &idb_rkey);
                if (ret < 0)
                        goto unmap;
                req->nmdesc++;
        } else {
-               idb_rkey = cpu_to_be32(target->global_mr->rkey);
+               idb_rkey = cpu_to_be32(pd->unsafe_global_rkey);
        }
 
        indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
@@ -3268,8 +3271,8 @@ static ssize_t srp_create_target(struct device *dev,
        target->io_class        = SRP_REV16A_IB_IO_CLASS;
        target->scsi_host       = target_host;
        target->srp_host        = host;
+       target->pd              = host->srp_dev->pd;
        target->lkey            = host->srp_dev->pd->local_dma_lkey;
-       target->global_mr       = host->srp_dev->global_mr;
        target->cmd_sg_cnt      = cmd_sg_entries;
        target->sg_tablesize    = indirect_sg_entries ? : cmd_sg_entries;
        target->allow_ext_sg    = allow_ext_sg;
@@ -3524,6 +3527,7 @@ static void srp_add_one(struct ib_device *device)
        struct srp_host *host;
        int mr_page_shift, p;
        u64 max_pages_per_mr;
+       unsigned int flags = 0;
 
        srp_dev = kzalloc(sizeof(*srp_dev), GFP_KERNEL);
        if (!srp_dev)
@@ -3558,6 +3562,10 @@ static void srp_add_one(struct ib_device *device)
                srp_dev->use_fmr = !srp_dev->use_fast_reg && srp_dev->has_fmr;
        }
 
+       if (never_register || !register_always ||
+           (!srp_dev->has_fmr && !srp_dev->has_fr))
+               flags |= IB_PD_UNSAFE_GLOBAL_RKEY;
+
        if (srp_dev->use_fast_reg) {
                srp_dev->max_pages_per_mr =
                        min_t(u32, srp_dev->max_pages_per_mr,
@@ -3573,19 +3581,10 @@ static void srp_add_one(struct ib_device *device)
        INIT_LIST_HEAD(&srp_dev->dev_list);
 
        srp_dev->dev = device;
-       srp_dev->pd  = ib_alloc_pd(device, 0);
+       srp_dev->pd  = ib_alloc_pd(device, flags);
        if (IS_ERR(srp_dev->pd))
                goto free_dev;
 
-       if (never_register || !register_always ||
-           (!srp_dev->has_fmr && !srp_dev->has_fr)) {
-               srp_dev->global_mr = ib_get_dma_mr(srp_dev->pd,
-                                                  IB_ACCESS_LOCAL_WRITE |
-                                                  IB_ACCESS_REMOTE_READ |
-                                                  IB_ACCESS_REMOTE_WRITE);
-               if (IS_ERR(srp_dev->global_mr))
-                       goto err_pd;
-       }
 
        for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
                host = srp_add_port(srp_dev, p);
@@ -3596,9 +3595,6 @@ static void srp_add_one(struct ib_device *device)
        ib_set_client_data(device, &srp_client, srp_dev);
        return;
 
-err_pd:
-       ib_dealloc_pd(srp_dev->pd);
-
 free_dev:
        kfree(srp_dev);
 }
@@ -3638,8 +3634,6 @@ static void srp_remove_one(struct ib_device *device, void *client_data)
                kfree(host);
        }
 
-       if (srp_dev->global_mr)
-               ib_dereg_mr(srp_dev->global_mr);
        ib_dealloc_pd(srp_dev->pd);
 
        kfree(srp_dev);

diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h
index 26bb9b0..21c6969 100644 (file)
--- a/drivers/infiniband/ulp/srp/ib_srp.h
+++ b/drivers/infiniband/ulp/srp/ib_srp.h
@@ -90,7 +90,6 @@ struct srp_device {
        struct list_head        dev_list;
        struct ib_device       *dev;
        struct ib_pd           *pd;
-       struct ib_mr           *global_mr;
        u64                     mr_page_mask;
        int                     mr_page_size;
        int                     mr_max_size;
@@ -179,7 +178,7 @@ struct srp_target_port {
        spinlock_t              lock;
 
        /* read only in the hot path */
-       struct ib_mr            *global_mr;
+       struct ib_pd            *pd;
        struct srp_rdma_ch      *ch;
        u32                     ch_count;
        u32                     lkey;