Concatination of send work requests benefits performance
by reducing the send queue lock contention (acquired in
ib_post_send) and saves us HW doorbells which is posted
only once.
Signed-off-by: Sagi Grimberg <sa...@mellanox.com>
---
drivers/infiniband/ulp/iser/iscsi_iser.c | 1 +
drivers/infiniband/ulp/iser/iscsi_iser.h | 34 +++++++++
drivers/infiniband/ulp/iser/iser_memory.c | 120 +++++++++++++-----------------
drivers/infiniband/ulp/iser/iser_verbs.c | 21 +++---
4 files changed, 99 insertions(+), 77 deletions(-)
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c
b/drivers/infiniband/ulp/iser/iscsi_iser.c
index 9eeefc8..ec87ce1 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.c
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -204,6 +204,7 @@ iser_initialize_task_headers(struct iscsi_task *task,
goto out;
}
+ tx_desc->wr_idx = 0;
tx_desc->mapped = true;
tx_desc->dma_addr = dma_addr;
tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h
b/drivers/infiniband/ulp/iser/iscsi_iser.h
index 8a32e20..4af1916 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.h
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -265,6 +265,14 @@ enum iser_desc_type {
ISCSI_TX_DATAOUT
};
+/* Maximum number of work requests per task:
+ * Data memory region local invalidate + fast registration
+ * Protection memory region local invalidate + fast registration
+ * Signature memory region local invalidate + fast registration
+ * PDU send
+ */
+#define ISER_MAX_WRS 7
+
/**
* struct iser_tx_desc - iSER TX descriptor (for send wr_id)
*
@@ -277,6 +285,11 @@ enum iser_desc_type {
* unsolicited data-out or control
* @num_sge: number sges used on this TX task
* @mapped: Is the task header mapped
+ * @wr_idx: Current WR index
+ * @wrs: Array of WRs per task
+ * @data_reg: Data buffer registration details
+ * @prot_reg: Protection buffer registration details
+ * @sig_attrs: Signature attributes
*/
struct iser_tx_desc {
struct iser_hdr iser_header;
@@ -286,6 +299,11 @@ struct iser_tx_desc {
struct ib_sge tx_sg[2];
int num_sge;
bool mapped;
+ u8 wr_idx;
+ struct ib_send_wr wrs[ISER_MAX_WRS];
+ struct iser_mem_reg data_reg;
+ struct iser_mem_reg prot_reg;
+ struct ib_sig_attrs sig_attrs;
};
#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
@@ -689,4 +707,20 @@ iser_reg_desc_get_fmr(struct ib_conn *ib_conn);
void
iser_reg_desc_put_fmr(struct ib_conn *ib_conn,
struct iser_fr_desc *desc);
+
+static inline struct ib_send_wr *
+iser_tx_next_wr(struct iser_tx_desc *tx_desc)
+{
+ struct ib_send_wr *cur_wr = &tx_desc->wrs[tx_desc->wr_idx];
+ struct ib_send_wr *last_wr;
+
+ if (tx_desc->wr_idx) {
+ last_wr = &tx_desc->wrs[tx_desc->wr_idx - 1];
+ last_wr->next = cur_wr;
+ }
+ tx_desc->wr_idx++;
+
+ return cur_wr;
+}
+
#endif
diff --git a/drivers/infiniband/ulp/iser/iser_memory.c
b/drivers/infiniband/ulp/iser/iser_memory.c
index 750f03f..2493cc7 100644
--- a/drivers/infiniband/ulp/iser/iser_memory.c
+++ b/drivers/infiniband/ulp/iser/iser_memory.c
@@ -664,10 +664,11 @@ iser_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
{
u32 rkey;
- memset(inv_wr, 0, sizeof(*inv_wr));
inv_wr->opcode = IB_WR_LOCAL_INV;
inv_wr->wr_id = ISER_FASTREG_LI_WRID;
inv_wr->ex.invalidate_rkey = mr->rkey;
+ inv_wr->send_flags = 0;
+ inv_wr->num_sge = 0;
rkey = ib_inc_rkey(mr->rkey);
ib_update_fast_reg_key(mr, rkey);
@@ -680,47 +681,38 @@ iser_reg_sig_mr(struct iscsi_iser_task *iser_task,
struct iser_mem_reg *prot_reg,
struct iser_mem_reg *sig_reg)
{
- struct ib_conn *ib_conn = &iser_task->iser_conn->ib_conn;
- struct ib_send_wr sig_wr, inv_wr;
- struct ib_send_wr *bad_wr, *wr = NULL;
- struct ib_sig_attrs sig_attrs;
+ struct iser_tx_desc *tx_desc = &iser_task->desc;
+ struct ib_sig_attrs *sig_attrs = &tx_desc->sig_attrs;
+ struct ib_send_wr *wr;
int ret;
- memset(&sig_attrs, 0, sizeof(sig_attrs));
- ret = iser_set_sig_attrs(iser_task->sc, &sig_attrs);
+ memset(sig_attrs, 0, sizeof(*sig_attrs));
+ ret = iser_set_sig_attrs(iser_task->sc, sig_attrs);
if (ret)
goto err;
- iser_set_prot_checks(iser_task->sc, &sig_attrs.check_mask);
+ iser_set_prot_checks(iser_task->sc, &sig_attrs->check_mask);
if (!pi_ctx->sig_mr_valid) {
- iser_inv_rkey(&inv_wr, pi_ctx->sig_mr);
- wr = &inv_wr;
+ wr = iser_tx_next_wr(tx_desc);
+ iser_inv_rkey(wr, pi_ctx->sig_mr);
}
- memset(&sig_wr, 0, sizeof(sig_wr));
- sig_wr.opcode = IB_WR_REG_SIG_MR;
- sig_wr.wr_id = ISER_FASTREG_LI_WRID;
- sig_wr.sg_list = &data_reg->sge;
- sig_wr.num_sge = 1;
- sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
- sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
+ wr = iser_tx_next_wr(tx_desc);
+ wr->opcode = IB_WR_REG_SIG_MR;
+ wr->wr_id = ISER_FASTREG_LI_WRID;
+ wr->sg_list = &data_reg->sge;
+ wr->num_sge = 1;
+ wr->send_flags = 0;
+ wr->wr.sig_handover.sig_attrs = sig_attrs;
+ wr->wr.sig_handover.sig_mr = pi_ctx->sig_mr;
if (scsi_prot_sg_count(iser_task->sc))
- sig_wr.wr.sig_handover.prot = &prot_reg->sge;
- sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE |
- IB_ACCESS_REMOTE_READ |
- IB_ACCESS_REMOTE_WRITE;
-
- if (!wr)
- wr = &sig_wr;
+ wr->wr.sig_handover.prot = &prot_reg->sge;
else
- wr->next = &sig_wr;
-
- ret = ib_post_send(ib_conn->qp, wr, &bad_wr);
- if (ret) {
- iser_err("reg_sig_mr failed, ret:%d\n", ret);
- goto err;
- }
+ wr->wr.sig_handover.prot = NULL;
+ wr->wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_READ |
+ IB_ACCESS_REMOTE_WRITE;
pi_ctx->sig_mr_valid = 0;
sig_reg->sge.lkey = pi_ctx->sig_mr->lkey;
@@ -744,9 +736,9 @@ static int iser_fast_reg_mr(struct iscsi_iser_task
*iser_task,
struct iser_device *device = ib_conn->device;
struct ib_mr *mr = rsc->mr;
struct ib_fast_reg_page_list *frpl = rsc->frpl;
- struct ib_send_wr fastreg_wr, inv_wr;
- struct ib_send_wr *bad_wr, *wr = NULL;
- int ret, offset, size, plen;
+ struct iser_tx_desc *tx_desc = &iser_task->desc;
+ struct ib_send_wr *wr;
+ int offset, size, plen;
plen = iser_sg_to_page_vec(mem, device->ib_device, frpl->page_list,
&offset, &size);
@@ -756,34 +748,23 @@ static int iser_fast_reg_mr(struct iscsi_iser_task
*iser_task,
}
if (!rsc->mr_valid) {
- iser_inv_rkey(&inv_wr, mr);
- wr = &inv_wr;
+ wr = iser_tx_next_wr(tx_desc);
+ iser_inv_rkey(wr, mr);
}
- /* Prepare FASTREG WR */
- memset(&fastreg_wr, 0, sizeof(fastreg_wr));
- fastreg_wr.wr_id = ISER_FASTREG_LI_WRID;
- fastreg_wr.opcode = IB_WR_FAST_REG_MR;
- fastreg_wr.wr.fast_reg.iova_start = frpl->page_list[0] + offset;
- fastreg_wr.wr.fast_reg.page_list = frpl;
- fastreg_wr.wr.fast_reg.page_list_len = plen;
- fastreg_wr.wr.fast_reg.page_shift = SHIFT_4K;
- fastreg_wr.wr.fast_reg.length = size;
- fastreg_wr.wr.fast_reg.rkey = mr->rkey;
- fastreg_wr.wr.fast_reg.access_flags = (IB_ACCESS_LOCAL_WRITE |
- IB_ACCESS_REMOTE_WRITE |
- IB_ACCESS_REMOTE_READ);
-
- if (!wr)
- wr = &fastreg_wr;
- else
- wr->next = &fastreg_wr;
-
- ret = ib_post_send(ib_conn->qp, wr, &bad_wr);
- if (ret) {
- iser_err("fast registration failed, ret:%d\n", ret);
- return ret;
- }
+ wr = iser_tx_next_wr(tx_desc);
+ wr->opcode = IB_WR_FAST_REG_MR;
+ wr->wr_id = ISER_FASTREG_LI_WRID;
+ wr->send_flags = 0;
+ wr->wr.fast_reg.iova_start = frpl->page_list[0] + offset;
+ wr->wr.fast_reg.page_list = frpl;
+ wr->wr.fast_reg.page_list_len = plen;
+ wr->wr.fast_reg.page_shift = SHIFT_4K;
+ wr->wr.fast_reg.length = size;
+ wr->wr.fast_reg.rkey = mr->rkey;
+ wr->wr.fast_reg.access_flags = (IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_WRITE |
+ IB_ACCESS_REMOTE_READ);
rsc->mr_valid = 0;
reg->sge.lkey = mr->lkey;
@@ -795,7 +776,7 @@ static int iser_fast_reg_mr(struct iscsi_iser_task
*iser_task,
" length=0x%x\n", reg->sge.lkey, reg->rkey,
reg->sge.addr, reg->sge.length);
- return ret;
+ return 0;
}
static int
@@ -853,6 +834,7 @@ int iser_reg_rdma_mem(struct iscsi_iser_task *task,
struct iser_device *device = ib_conn->device;
struct iser_data_buf *mem = &task->data[dir];
struct iser_mem_reg *reg = &task->rdma_reg[dir];
+ struct iser_mem_reg *data_reg;
struct iser_fr_desc *desc = NULL;
int err;
@@ -866,27 +848,31 @@ int iser_reg_rdma_mem(struct iscsi_iser_task *task,
reg->mem_h = desc;
}
- err = iser_reg_data_sg(task, mem, desc, reg);
+ if (scsi_get_prot_op(task->sc) == SCSI_PROT_NORMAL)
+ data_reg = reg;
+ else
+ data_reg = &task->desc.data_reg;
+
+ err = iser_reg_data_sg(task, mem, desc, data_reg);
if (unlikely(err))
goto err_reg;
if (scsi_get_prot_op(task->sc) != SCSI_PROT_NORMAL) {
- struct iser_mem_reg prot_reg;
+ struct iser_mem_reg *prot_reg = &task->desc.prot_reg;
- memset(&prot_reg, 0, sizeof(prot_reg));
if (scsi_prot_sg_count(task->sc)) {
mem = &task->prot[dir];
err = iser_handle_unaligned_buf(task, mem, dir);
if (unlikely(err))
goto err_reg;
- err = iser_reg_prot_sg(task, mem, desc, &prot_reg);
+ err = iser_reg_prot_sg(task, mem, desc, prot_reg);
if (unlikely(err))
goto err_reg;
}
- err = iser_reg_sig_mr(task, desc->pi_ctx, reg,
- &prot_reg, reg);
+ err = iser_reg_sig_mr(task, desc->pi_ctx, data_reg,
+ prot_reg, reg);
if (unlikely(err))
goto err_reg;
diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c
b/drivers/infiniband/ulp/iser/iser_verbs.c
index f69cee7..ad2d2b5 100644
--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -1116,23 +1116,24 @@ int iser_post_recvm(struct iser_conn *iser_conn, int
count)
int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
bool signal)
{
- int ib_ret;
- struct ib_send_wr send_wr, *send_wr_failed;
+ struct ib_send_wr *bad_wr, *wr = iser_tx_next_wr(tx_desc);
+ int ib_ret;
ib_dma_sync_single_for_device(ib_conn->device->ib_device,
tx_desc->dma_addr, ISER_HEADERS_LEN,
DMA_TO_DEVICE);
- send_wr.next = NULL;
- send_wr.wr_id = (uintptr_t)tx_desc;
- send_wr.sg_list = tx_desc->tx_sg;
- send_wr.num_sge = tx_desc->num_sge;
- send_wr.opcode = IB_WR_SEND;
- send_wr.send_flags = signal ? IB_SEND_SIGNALED : 0;
+ wr->next = NULL;
+ wr->wr_id = (uintptr_t)tx_desc;
+ wr->sg_list = tx_desc->tx_sg;
+ wr->num_sge = tx_desc->num_sge;
+ wr->opcode = IB_WR_SEND;
+ wr->send_flags = signal ? IB_SEND_SIGNALED : 0;
- ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
+ ib_ret = ib_post_send(ib_conn->qp, &tx_desc->wrs[0], &bad_wr);
if (ib_ret)
- iser_err("ib_post_send failed, ret:%d\n", ib_ret);
+ iser_err("ib_post_send failed, ret:%d opcode:%d\n",
+ ib_ret, bad_wr->opcode);
return ib_ret;
}
--
1.8.4.3
--
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