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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 05:04:00 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 05:04:00 -0300
commit273d4428f8c4cc94c9598f8bcc006ec2e8c654ea (patch)
treea453898167c5f6387e740a704a46b44b0a35b88a /drivers/infiniband/core
parent863981e96738983919de841ec669e157e6bdaeb0 (diff)
Linux-libre 4.7.2-gnupck-4.7.2-gnu
Diffstat (limited to 'drivers/infiniband/core')
-rw-r--r--drivers/infiniband/core/rw.c24
-rw-r--r--drivers/infiniband/core/verbs.c9
2 files changed, 20 insertions, 13 deletions
diff --git a/drivers/infiniband/core/rw.c b/drivers/infiniband/core/rw.c
index 1eb9b1294..dbfd854c3 100644
--- a/drivers/infiniband/core/rw.c
+++ b/drivers/infiniband/core/rw.c
@@ -58,19 +58,13 @@ static inline bool rdma_rw_io_needs_mr(struct ib_device *dev, u8 port_num,
return false;
}
-static inline u32 rdma_rw_max_sge(struct ib_device *dev,
- enum dma_data_direction dir)
-{
- return dir == DMA_TO_DEVICE ?
- dev->attrs.max_sge : dev->attrs.max_sge_rd;
-}
-
static inline u32 rdma_rw_fr_page_list_len(struct ib_device *dev)
{
/* arbitrary limit to avoid allocating gigantic resources */
return min_t(u32, dev->attrs.max_fast_reg_page_list_len, 256);
}
+/* Caller must have zero-initialized *reg. */
static int rdma_rw_init_one_mr(struct ib_qp *qp, u8 port_num,
struct rdma_rw_reg_ctx *reg, struct scatterlist *sg,
u32 sg_cnt, u32 offset)
@@ -114,6 +108,7 @@ static int rdma_rw_init_mr_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
u8 port_num, struct scatterlist *sg, u32 sg_cnt, u32 offset,
u64 remote_addr, u32 rkey, enum dma_data_direction dir)
{
+ struct rdma_rw_reg_ctx *prev = NULL;
u32 pages_per_mr = rdma_rw_fr_page_list_len(qp->pd->device);
int i, j, ret = 0, count = 0;
@@ -125,7 +120,6 @@ static int rdma_rw_init_mr_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
}
for (i = 0; i < ctx->nr_ops; i++) {
- struct rdma_rw_reg_ctx *prev = i ? &ctx->reg[i - 1] : NULL;
struct rdma_rw_reg_ctx *reg = &ctx->reg[i];
u32 nents = min(sg_cnt, pages_per_mr);
@@ -162,9 +156,13 @@ static int rdma_rw_init_mr_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
sg_cnt -= nents;
for (j = 0; j < nents; j++)
sg = sg_next(sg);
+ prev = reg;
offset = 0;
}
+ if (prev)
+ prev->wr.wr.next = NULL;
+
ctx->type = RDMA_RW_MR;
return count;
@@ -181,7 +179,8 @@ static int rdma_rw_init_map_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
u64 remote_addr, u32 rkey, enum dma_data_direction dir)
{
struct ib_device *dev = qp->pd->device;
- u32 max_sge = rdma_rw_max_sge(dev, dir);
+ u32 max_sge = dir == DMA_TO_DEVICE ? qp->max_write_sge :
+ qp->max_read_sge;
struct ib_sge *sge;
u32 total_len = 0, i, j;
@@ -205,11 +204,10 @@ static int rdma_rw_init_map_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
rdma_wr->wr.opcode = IB_WR_RDMA_READ;
rdma_wr->remote_addr = remote_addr + total_len;
rdma_wr->rkey = rkey;
+ rdma_wr->wr.num_sge = nr_sge;
rdma_wr->wr.sg_list = sge;
for (j = 0; j < nr_sge; j++, sg = sg_next(sg)) {
- rdma_wr->wr.num_sge++;
-
sge->addr = ib_sg_dma_address(dev, sg) + offset;
sge->length = ib_sg_dma_len(dev, sg) - offset;
sge->lkey = qp->pd->local_dma_lkey;
@@ -220,8 +218,8 @@ static int rdma_rw_init_map_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp,
offset = 0;
}
- if (i + 1 < ctx->nr_ops)
- rdma_wr->wr.next = &ctx->map.wrs[i + 1].wr;
+ rdma_wr->wr.next = i + 1 < ctx->nr_ops ?
+ &ctx->map.wrs[i + 1].wr : NULL;
}
ctx->type = RDMA_RW_MULTI_WR;
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 6298f54b4..e39a0b597 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -814,6 +814,15 @@ struct ib_qp *ib_create_qp(struct ib_pd *pd,
}
}
+ /*
+ * Note: all hw drivers guarantee that max_send_sge is lower than
+ * the device RDMA WRITE SGE limit but not all hw drivers ensure that
+ * max_send_sge <= max_sge_rd.
+ */
+ qp->max_write_sge = qp_init_attr->cap.max_send_sge;
+ qp->max_read_sge = min_t(u32, qp_init_attr->cap.max_send_sge,
+ device->attrs.max_sge_rd);
+
return qp;
}
EXPORT_SYMBOL(ib_create_qp);