IB/srp: Re-enable FMR for non-page aligned buffers

During a discussion in 2011 nobody recalled why FMR was not used for
non-page aligned buffers (see also
http://thread.gmane.org/gmane.linux.drivers.rdma/7149). Re-enable FMR
for such buffers. For the reason why the srp_map_fmr() function needs
to be modified, see also patch "IB/srp: rework mapping engine to use
multiple FMR entries" (commit ID 8f26c9ff9cd0; January 2011).

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.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 b890367..6ed976d 100644 (file)
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1272,6 +1272,8 @@ static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
 static int srp_map_finish_fmr(struct srp_map_state *state,
                              struct srp_rdma_ch *ch)
 {
+       struct srp_target_port *target = ch->target;
+       struct srp_device *dev = target->srp_host->srp_dev;
        struct ib_pool_fmr *fmr;
        u64 io_addr = 0;
 
@@ -1283,7 +1285,8 @@ static int srp_map_finish_fmr(struct srp_map_state *state,
        *state->next_fmr++ = fmr;
        state->nmdesc++;
 
-       srp_map_desc(state, 0, state->dma_len, fmr->fmr->rkey);
+       srp_map_desc(state, state->base_dma_addr & ~dev->mr_page_mask,
+                    state->dma_len, fmr->fmr->rkey);
 
        return 0;
 }
@@ -1390,14 +1393,7 @@ static int srp_map_sg_entry(struct srp_map_state *state,
                return 0;
        }
 
-       /*
-        * Since not all RDMA HW drivers support non-zero page offsets for
-        * FMR, if we start at an offset into a page, don't merge into the
-        * current FMR mapping. Finish it out, and use the kernel's MR for
-        * this sg entry.
-        */
-       if ((!dev->use_fast_reg && dma_addr & ~dev->mr_page_mask) ||
-           dma_len > dev->mr_max_size) {
+       if (dma_len > dev->mr_max_size) {
                ret = srp_finish_mapping(state, ch);
                if (ret)
                        return ret;