Instead of maintaining a fastreg page list, keep an sg table
and convert an array of pages to a sg list. Then call ib_map_mr_sg
and construct ib_reg_wr.
Signed-off-by: Sagi Grimberg <sagig@xxxxxxxxxxxx>
---
include/linux/sunrpc/svc_rdma.h | 6 +--
net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 76 ++++++++++++++++++--------------
net/sunrpc/xprtrdma/svc_rdma_transport.c | 34 +++++---------
3 files changed, 55 insertions(+), 61 deletions(-)
diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
index 83211bc9219e..e240d102a911 100644
--- a/include/linux/sunrpc/svc_rdma.h
+++ b/include/linux/sunrpc/svc_rdma.h
@@ -105,11 +105,9 @@ struct svc_rdma_chunk_sge {
};
struct svc_rdma_fastreg_mr {
struct ib_mr *mr;
- void *kva;
- struct ib_fast_reg_page_list *page_list;
- int page_list_len;
+ struct scatterlist *sg;
+ unsigned int sg_nents;
unsigned long access_flags;
- unsigned long map_len;
enum dma_data_direction direction;
struct list_head frmr_list;
};
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index 7be42d0da19e..303f194970f9 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -220,12 +220,12 @@ int rdma_read_chunk_frmr(struct svcxprt_rdma *xprt,
{
struct ib_rdma_wr read_wr;
struct ib_send_wr inv_wr;
- struct ib_fast_reg_wr fastreg_wr;
+ struct ib_reg_wr reg_wr;
u8 key;
- int pages_needed = PAGE_ALIGN(*page_offset + rs_length) >> PAGE_SHIFT;
+ unsigned int nents = PAGE_ALIGN(*page_offset + rs_length) >> PAGE_SHIFT;
struct svc_rdma_op_ctxt *ctxt = svc_rdma_get_context(xprt);
struct svc_rdma_fastreg_mr *frmr = svc_rdma_get_frmr(xprt);
- int ret, read, pno;
+ int ret, read, pno, dma_nents, n;
u32 pg_off = *page_offset;
u32 pg_no = *page_no;
@@ -234,16 +234,14 @@ int rdma_read_chunk_frmr(struct svcxprt_rdma *xprt,
ctxt->direction = DMA_FROM_DEVICE;
ctxt->frmr = frmr;
- pages_needed = min_t(int, pages_needed, xprt->sc_frmr_pg_list_len);
- read = min_t(int, pages_needed << PAGE_SHIFT, rs_length);
+ nents = min_t(unsigned int, nents, xprt->sc_frmr_pg_list_len);
+ read = min_t(int, nents << PAGE_SHIFT, rs_length);
- frmr->kva = page_address(rqstp->rq_arg.pages[pg_no]);
frmr->direction = DMA_FROM_DEVICE;
frmr->access_flags = (IB_ACCESS_LOCAL_WRITE|IB_ACCESS_REMOTE_WRITE);
- frmr->map_len = pages_needed << PAGE_SHIFT;
- frmr->page_list_len = pages_needed;
+ frmr->sg_nents = nents;
- for (pno = 0; pno < pages_needed; pno++) {
+ for (pno = 0; pno < nents; pno++) {
int len = min_t(int, rs_length, PAGE_SIZE - pg_off);
head->arg.pages[pg_no] = rqstp->rq_arg.pages[pg_no];
@@ -251,17 +249,12 @@ int rdma_read_chunk_frmr(struct svcxprt_rdma *xprt,
head->arg.len += len;
if (!pg_off)
head->count++;
+
+ sg_set_page(&frmr->sg[pno], rqstp->rq_arg.pages[pg_no],
+ len, pg_off);
+
rqstp->rq_respages = &rqstp->rq_arg.pages[pg_no+1];
rqstp->rq_next_page = rqstp->rq_respages + 1;
- frmr->page_list->page_list[pno] =
- ib_dma_map_page(xprt->sc_cm_id->device,
- head->arg.pages[pg_no], 0,
- PAGE_SIZE, DMA_FROM_DEVICE);
- ret = ib_dma_mapping_error(xprt->sc_cm_id->device,
- frmr->page_list->page_list[pno]);
- if (ret)
- goto err;
- atomic_inc(&xprt->sc_dma_used);
/* adjust offset and wrap to next page if needed */
pg_off += len;
@@ -277,28 +270,42 @@ int rdma_read_chunk_frmr(struct svcxprt_rdma *xprt,
else
clear_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags);
+ dma_nents = ib_dma_map_sg(xprt->sc_cm_id->device,
+ frmr->sg, frmr->sg_nents,
+ frmr->direction);
+ if (!dma_nents) {
+ pr_err("svcrdma: failed to dma map sg %p\n",
+ frmr->sg);
+ return -ENOMEM;
+ }
+ atomic_inc(&xprt->sc_dma_used);
+
+ n = ib_map_mr_sg(frmr->mr, frmr->sg, frmr->sg_nents, PAGE_SIZE);
+ if (unlikely(n != frmr->sg_nents)) {
+ pr_err("svcrdma: failed to map mr %p (%d/%d elements)\n",
+ frmr->mr, n, frmr->sg_nents);
+ return n < 0 ? n : -EINVAL;
+ }
+
/* Bump the key */
key = (u8)(frmr->mr->lkey & 0x000000FF);
ib_update_fast_reg_key(frmr->mr, ++key);
- ctxt->sge[0].addr = (unsigned long)frmr->kva + *page_offset;
+ ctxt->sge[0].addr = frmr->mr->iova;
ctxt->sge[0].lkey = frmr->mr->lkey;
- ctxt->sge[0].length = read;
+ ctxt->sge[0].length = frmr->mr->length;
ctxt->count = 1;
ctxt->read_hdr = head;
- /* Prepare FASTREG WR */
- memset(&fastreg_wr, 0, sizeof(fastreg_wr));
- fastreg_wr.wr.opcode = IB_WR_FAST_REG_MR;
- fastreg_wr.wr.send_flags = IB_SEND_SIGNALED;
- fastreg_wr.iova_start = (unsigned long)frmr->kva;
- fastreg_wr.page_list = frmr->page_list;
- fastreg_wr.page_list_len = frmr->page_list_len;
- fastreg_wr.page_shift = PAGE_SHIFT;
- fastreg_wr.length = frmr->map_len;
- fastreg_wr.access_flags = frmr->access_flags;
- fastreg_wr.rkey = frmr->mr->lkey;
- fastreg_wr.wr.next = &read_wr.wr;
+ /* Prepare REG WR */
+ reg_wr.wr.opcode = IB_WR_REG_MR;
+ reg_wr.wr.wr_id = 0;
+ reg_wr.wr.send_flags = IB_SEND_SIGNALED;
+ reg_wr.wr.num_sge = 0;
+ reg_wr.mr = frmr->mr;
+ reg_wr.key = frmr->mr->lkey;
+ reg_wr.access = frmr->access_flags;
+ reg_wr.wr.next = &read_wr.wr;
/* Prepare RDMA_READ */
memset(&read_wr, 0, sizeof(read_wr));
@@ -324,7 +331,7 @@ int rdma_read_chunk_frmr(struct svcxprt_rdma *xprt,
ctxt->wr_op = read_wr.wr.opcode;
/* Post the chain */
- ret = svc_rdma_send(xprt, &fastreg_wr.wr);
+ ret = svc_rdma_send(xprt, ®_wr.wr);
if (ret) {
pr_err("svcrdma: Error %d posting RDMA_READ\n", ret);
set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
@@ -338,7 +345,8 @@ int rdma_read_chunk_frmr(struct svcxprt_rdma *xprt,
atomic_inc(&rdma_stat_read);
return ret;
err:
- svc_rdma_unmap_dma(ctxt);
+ ib_dma_unmap_sg(xprt->sc_cm_id->device,
+ frmr->sg, frmr->sg_nents, frmr->direction);
svc_rdma_put_context(ctxt, 0);
svc_rdma_put_frmr(xprt, frmr);
return ret;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index b9fe134bb416..13d26a7ddee4 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -731,7 +731,7 @@ static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt)
{
struct ib_mr *mr;
- struct ib_fast_reg_page_list *pl;
+ struct scatterlist *sg;
struct svc_rdma_fastreg_mr *frmr;
u32 num_sg;
@@ -744,13 +744,14 @@ static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt)
if (IS_ERR(mr))
goto err_free_frmr;
- pl = ib_alloc_fast_reg_page_list(xprt->sc_cm_id->device,
- num_sg);
- if (IS_ERR(pl))
+ sg = kcalloc(sizeof(*sg), RPCSVC_MAXPAGES, GFP_KERNEL);
+ if (IS_ERR(sg))
goto err_free_mr;
+ sg_init_table(sg, RPCSVC_MAXPAGES);
+
frmr->mr = mr;
- frmr->page_list = pl;
+ frmr->sg = sg;
INIT_LIST_HEAD(&frmr->frmr_list);
return frmr;
@@ -770,8 +771,8 @@ static void rdma_dealloc_frmr_q(struct svcxprt_rdma *xprt)
frmr = list_entry(xprt->sc_frmr_q.next,
struct svc_rdma_fastreg_mr, frmr_list);
list_del_init(&frmr->frmr_list);
+ kfree(frmr->sg);
ib_dereg_mr(frmr->mr);
- ib_free_fast_reg_page_list(frmr->page_list);
kfree(frmr);
}
}
@@ -785,8 +786,7 @@ struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma)
frmr = list_entry(rdma->sc_frmr_q.next,
struct svc_rdma_fastreg_mr, frmr_list);
list_del_init(&frmr->frmr_list);
- frmr->map_len = 0;
- frmr->page_list_len = 0;
+ frmr->sg_nents = 0;
}
spin_unlock_bh(&rdma->sc_frmr_q_lock);
if (frmr)
@@ -795,25 +795,13 @@ struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma)
return rdma_alloc_frmr(rdma);
}
-static void frmr_unmap_dma(struct svcxprt_rdma *xprt,
- struct svc_rdma_fastreg_mr *frmr)
-{
- int page_no;
- for (page_no = 0; page_no < frmr->page_list_len; page_no++) {
- dma_addr_t addr = frmr->page_list->page_list[page_no];
- if (ib_dma_mapping_error(frmr->mr->device, addr))
- continue;
- atomic_dec(&xprt->sc_dma_used);
- ib_dma_unmap_page(frmr->mr->device, addr, PAGE_SIZE,
- frmr->direction);
- }
-}
-
void svc_rdma_put_frmr(struct svcxprt_rdma *rdma,
struct svc_rdma_fastreg_mr *frmr)
{
if (frmr) {
- frmr_unmap_dma(rdma, frmr);
+ ib_dma_unmap_sg(rdma->sc_cm_id->device,
+ frmr->sg, frmr->sg_nents, frmr->direction);
+ atomic_dec(&rdma->sc_dma_used);
spin_lock_bh(&rdma->sc_frmr_q_lock);
WARN_ON_ONCE(!list_empty(&frmr->frmr_list));
list_add(&frmr->frmr_list, &rdma->sc_frmr_q);
--
1.8.4.3
--
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