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-rw-r--r--drivers/infiniband/core/rw.c24
-rw-r--r--drivers/infiniband/core/verbs.c9
-rw-r--r--drivers/infiniband/ulp/isert/ib_isert.c2
-rw-r--r--drivers/infiniband/ulp/isert/ib_isert.h1
-rw-r--r--drivers/infiniband/ulp/srpt/ib_srpt.c10
-rw-r--r--drivers/infiniband/ulp/srpt/ib_srpt.h6
-rw-r--r--include/rdma/ib_verbs.h6
7 files changed, 35 insertions, 23 deletions
diff --git a/drivers/infiniband/core/rw.c b/drivers/infiniband/core/rw.c
index 1eb9b1294a63..dbfd854c32c9 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 6298f54b4137..e39a0b597234 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);
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index a990c04208c9..ba6be060a476 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -137,8 +137,6 @@ isert_create_qp(struct isert_conn *isert_conn,
attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX;
attr.cap.max_send_sge = device->ib_device->attrs.max_sge;
- isert_conn->max_sge = min(device->ib_device->attrs.max_sge,
- device->ib_device->attrs.max_sge_rd);
attr.cap.max_recv_sge = 1;
attr.sq_sig_type = IB_SIGNAL_REQ_WR;
attr.qp_type = IB_QPT_RC;
diff --git a/drivers/infiniband/ulp/isert/ib_isert.h b/drivers/infiniband/ulp/isert/ib_isert.h
index e512ba941f2f..fc791efe3a10 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.h
+++ b/drivers/infiniband/ulp/isert/ib_isert.h
@@ -138,7 +138,6 @@ struct isert_conn {
u32 responder_resources;
u32 initiator_depth;
bool pi_support;
- u32 max_sge;
struct iser_rx_desc *login_req_buf;
char *login_rsp_buf;
u64 login_req_dma;
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index 4a4155640d51..dfa23b075a88 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -1601,6 +1601,7 @@ static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
struct ib_qp_init_attr *qp_init;
struct srpt_port *sport = ch->sport;
struct srpt_device *sdev = sport->sdev;
+ const struct ib_device_attr *attrs = &sdev->device->attrs;
u32 srp_sq_size = sport->port_attrib.srp_sq_size;
int ret;
@@ -1638,7 +1639,7 @@ retry:
*/
qp_init->cap.max_send_wr = srp_sq_size / 2;
qp_init->cap.max_rdma_ctxs = srp_sq_size / 2;
- qp_init->cap.max_send_sge = SRPT_DEF_SG_PER_WQE;
+ qp_init->cap.max_send_sge = min(attrs->max_sge, SRPT_MAX_SG_PER_WQE);
qp_init->port_num = ch->sport->port;
ch->qp = ib_create_qp(sdev->pd, qp_init);
@@ -2261,7 +2262,7 @@ static void srpt_queue_response(struct se_cmd *cmd)
container_of(cmd, struct srpt_send_ioctx, cmd);
struct srpt_rdma_ch *ch = ioctx->ch;
struct srpt_device *sdev = ch->sport->sdev;
- struct ib_send_wr send_wr, *first_wr = NULL, *bad_wr;
+ struct ib_send_wr send_wr, *first_wr = &send_wr, *bad_wr;
struct ib_sge sge;
enum srpt_command_state state;
unsigned long flags;
@@ -2302,11 +2303,8 @@ static void srpt_queue_response(struct se_cmd *cmd)
struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp,
- ch->sport->port, NULL,
- first_wr ? first_wr : &send_wr);
+ ch->sport->port, NULL, first_wr);
}
- } else {
- first_wr = &send_wr;
}
if (state != SRPT_STATE_MGMT)
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.h b/drivers/infiniband/ulp/srpt/ib_srpt.h
index 389030487da7..581878782854 100644
--- a/drivers/infiniband/ulp/srpt/ib_srpt.h
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.h
@@ -106,7 +106,11 @@ enum {
SRP_LOGIN_RSP_MULTICHAN_MAINTAINED = 0x2,
SRPT_DEF_SG_TABLESIZE = 128,
- SRPT_DEF_SG_PER_WQE = 16,
+ /*
+ * An experimentally determined value that avoids that QP creation
+ * fails due to "swiotlb buffer is full" on systems using the swiotlb.
+ */
+ SRPT_MAX_SG_PER_WQE = 16,
MIN_SRPT_SQ_SIZE = 16,
DEF_SRPT_SQ_SIZE = 4096,
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 7e440d41487a..e694f02d42e3 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1428,6 +1428,10 @@ struct ib_srq {
} ext;
};
+/*
+ * @max_write_sge: Maximum SGE elements per RDMA WRITE request.
+ * @max_read_sge: Maximum SGE elements per RDMA READ request.
+ */
struct ib_qp {
struct ib_device *device;
struct ib_pd *pd;
@@ -1449,6 +1453,8 @@ struct ib_qp {
void (*event_handler)(struct ib_event *, void *);
void *qp_context;
u32 qp_num;
+ u32 max_write_sge;
+ u32 max_read_sge;
enum ib_qp_type qp_type;
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 11:12:53 +0000