Commit 564471d2 authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker

xprtrdma: Create common scatterlist fields in rpcrdma_mw

Clean up: FMR is about to replace the rpcrdma_map_one code with
scatterlists. Move the scatterlist fields out of the FRWR-specific
union and into the generic part of rpcrdma_mw.

One minor change: -EIO is now returned if FRWR registration fails.
The RPC is terminated immediately, since the problem is likely due
to a software bug, thus retrying likely won't help.
Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Tested-by: default avatarSteve Wise <swise@opengridcomputing.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent 38f1932e
......@@ -125,17 +125,16 @@ __frwr_reset_mr(struct rpcrdma_ia *ia, struct rpcrdma_mw *r)
}
static void
__frwr_reset_and_unmap(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw)
__frwr_reset_and_unmap(struct rpcrdma_mw *mw)
{
struct rpcrdma_xprt *r_xprt = mw->mw_xprt;
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct rpcrdma_frmr *f = &mw->frmr;
int rc;
rc = __frwr_reset_mr(ia, mw);
ib_dma_unmap_sg(ia->ri_device, f->fr_sg, f->fr_nents, f->fr_dir);
ib_dma_unmap_sg(ia->ri_device, mw->mw_sg, mw->mw_nents, mw->mw_dir);
if (rc)
return;
rpcrdma_put_mw(r_xprt, mw);
}
......@@ -152,8 +151,7 @@ __frwr_recovery_worker(struct work_struct *work)
struct rpcrdma_mw *r = container_of(work, struct rpcrdma_mw,
mw_work);
__frwr_reset_and_unmap(r->mw_xprt, r);
return;
__frwr_reset_and_unmap(r);
}
/* A broken MR was discovered in a context that can't sleep.
......@@ -167,8 +165,7 @@ __frwr_queue_recovery(struct rpcrdma_mw *r)
}
static int
__frwr_init(struct rpcrdma_mw *r, struct ib_pd *pd, struct ib_device *device,
unsigned int depth)
__frwr_init(struct rpcrdma_mw *r, struct ib_pd *pd, unsigned int depth)
{
struct rpcrdma_frmr *f = &r->frmr;
int rc;
......@@ -177,11 +174,11 @@ __frwr_init(struct rpcrdma_mw *r, struct ib_pd *pd, struct ib_device *device,
if (IS_ERR(f->fr_mr))
goto out_mr_err;
f->fr_sg = kcalloc(depth, sizeof(*f->fr_sg), GFP_KERNEL);
if (!f->fr_sg)
r->mw_sg = kcalloc(depth, sizeof(*r->mw_sg), GFP_KERNEL);
if (!r->mw_sg)
goto out_list_err;
sg_init_table(f->fr_sg, depth);
sg_init_table(r->mw_sg, depth);
init_completion(&f->fr_linv_done);
......@@ -210,7 +207,7 @@ __frwr_release(struct rpcrdma_mw *r)
if (rc)
dprintk("RPC: %s: ib_dereg_mr status %i\n",
__func__, rc);
kfree(r->frmr.fr_sg);
kfree(r->mw_sg);
}
static int
......@@ -350,7 +347,6 @@ static int
frwr_op_init(struct rpcrdma_xprt *r_xprt)
{
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
struct ib_device *device = r_xprt->rx_ia.ri_device;
unsigned int depth = r_xprt->rx_ia.ri_max_frmr_depth;
struct ib_pd *pd = r_xprt->rx_ia.ri_pd;
int i;
......@@ -372,7 +368,7 @@ frwr_op_init(struct rpcrdma_xprt *r_xprt)
if (!r)
return -ENOMEM;
rc = __frwr_init(r, pd, device, depth);
rc = __frwr_init(r, pd, depth);
if (rc) {
kfree(r);
return rc;
......@@ -386,7 +382,7 @@ frwr_op_init(struct rpcrdma_xprt *r_xprt)
return 0;
}
/* Post a FAST_REG Work Request to register a memory region
/* Post a REG_MR Work Request to register a memory region
* for remote access via RDMA READ or RDMA WRITE.
*/
static int
......@@ -394,8 +390,6 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
int nsegs, bool writing)
{
struct rpcrdma_ia *ia = &r_xprt->rx_ia;
struct ib_device *device = ia->ri_device;
enum dma_data_direction direction = rpcrdma_data_dir(writing);
struct rpcrdma_mr_seg *seg1 = seg;
struct rpcrdma_mw *mw;
struct rpcrdma_frmr *frmr;
......@@ -421,15 +415,14 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
if (nsegs > ia->ri_max_frmr_depth)
nsegs = ia->ri_max_frmr_depth;
for (i = 0; i < nsegs;) {
if (seg->mr_page)
sg_set_page(&frmr->fr_sg[i],
sg_set_page(&mw->mw_sg[i],
seg->mr_page,
seg->mr_len,
offset_in_page(seg->mr_offset));
else
sg_set_buf(&frmr->fr_sg[i], seg->mr_offset,
sg_set_buf(&mw->mw_sg[i], seg->mr_offset,
seg->mr_len);
++seg;
......@@ -440,26 +433,20 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
offset_in_page((seg-1)->mr_offset + (seg-1)->mr_len))
break;
}
frmr->fr_nents = i;
frmr->fr_dir = direction;
mw->mw_nents = i;
mw->mw_dir = rpcrdma_data_dir(writing);
dma_nents = ib_dma_map_sg(device, frmr->fr_sg, frmr->fr_nents, direction);
if (!dma_nents) {
pr_err("RPC: %s: failed to dma map sg %p sg_nents %u\n",
__func__, frmr->fr_sg, frmr->fr_nents);
return -ENOMEM;
}
dma_nents = ib_dma_map_sg(ia->ri_device,
mw->mw_sg, mw->mw_nents, mw->mw_dir);
if (!dma_nents)
goto out_dmamap_err;
n = ib_map_mr_sg(mr, frmr->fr_sg, frmr->fr_nents, NULL, PAGE_SIZE);
if (unlikely(n != frmr->fr_nents)) {
pr_err("RPC: %s: failed to map mr %p (%u/%u)\n",
__func__, frmr->fr_mr, n, frmr->fr_nents);
rc = n < 0 ? n : -EINVAL;
goto out_senderr;
}
n = ib_map_mr_sg(mr, mw->mw_sg, mw->mw_nents, NULL, PAGE_SIZE);
if (unlikely(n != mw->mw_nents))
goto out_mapmr_err;
dprintk("RPC: %s: Using frmr %p to map %u segments (%u bytes)\n",
__func__, mw, frmr->fr_nents, mr->length);
__func__, mw, mw->mw_nents, mr->length);
key = (u8)(mr->rkey & 0x000000FF);
ib_update_fast_reg_key(mr, ++key);
......@@ -484,13 +471,25 @@ frwr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
seg1->rl_mw = mw;
seg1->mr_rkey = mr->rkey;
seg1->mr_base = mr->iova;
seg1->mr_nsegs = frmr->fr_nents;
seg1->mr_nsegs = mw->mw_nents;
seg1->mr_len = mr->length;
return frmr->fr_nents;
return mw->mw_nents;
out_dmamap_err:
pr_err("rpcrdma: failed to dma map sg %p sg_nents %u\n",
mw->mw_sg, mw->mw_nents);
return -ENOMEM;
out_mapmr_err:
pr_err("rpcrdma: failed to map mr %p (%u/%u)\n",
frmr->fr_mr, n, mw->mw_nents);
rc = n < 0 ? n : -EIO;
__frwr_queue_recovery(mw);
return rc;
out_senderr:
dprintk("RPC: %s: ib_post_send status %i\n", __func__, rc);
pr_err("rpcrdma: ib_post_send status %i\n", rc);
__frwr_queue_recovery(mw);
return rc;
}
......@@ -582,8 +581,8 @@ frwr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req)
mw = seg->rl_mw;
seg->rl_mw = NULL;
ib_dma_unmap_sg(ia->ri_device, f->fr_sg, f->fr_nents,
f->fr_dir);
ib_dma_unmap_sg(ia->ri_device,
mw->mw_sg, mw->mw_nents, mw->mw_dir);
rpcrdma_put_mw(r_xprt, mw);
i += seg->mr_nsegs;
......@@ -630,7 +629,7 @@ frwr_op_unmap_safe(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req,
mw = seg->rl_mw;
if (sync)
__frwr_reset_and_unmap(r_xprt, mw);
__frwr_reset_and_unmap(mw);
else
__frwr_queue_recovery(mw);
......
......@@ -221,9 +221,6 @@ enum rpcrdma_frmr_state {
};
struct rpcrdma_frmr {
struct scatterlist *fr_sg;
int fr_nents;
enum dma_data_direction fr_dir;
struct ib_mr *fr_mr;
struct ib_cqe fr_cqe;
enum rpcrdma_frmr_state fr_state;
......@@ -240,13 +237,16 @@ struct rpcrdma_fmr {
};
struct rpcrdma_mw {
struct list_head mw_list;
struct scatterlist *mw_sg;
int mw_nents;
enum dma_data_direction mw_dir;
union {
struct rpcrdma_fmr fmr;
struct rpcrdma_frmr frmr;
};
struct work_struct mw_work;
struct rpcrdma_xprt *mw_xprt;
struct list_head mw_list;
struct list_head mw_all;
};
......
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