IB/iser: Use different CQ for send completions
Use a different CQ for send completions, where send completions are
polled by the interrupt-driven receive completion handler. Therefore,
interrupts aren't used for the send CQ.
Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
index 4491235..a314576 100644
--- a/drivers/infiniband/ulp/iser/iscsi_iser.h
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -247,7 +247,8 @@
struct iser_device {
struct ib_device *ib_device;
struct ib_pd *pd;
- struct ib_cq *cq;
+ struct ib_cq *rx_cq;
+ struct ib_cq *tx_cq;
struct ib_mr *mr;
struct tasklet_struct cq_tasklet;
struct list_head ig_list; /* entry in ig devices list */
diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
index 202c00d..218aa10 100644
--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -37,9 +37,8 @@
#include "iscsi_iser.h"
#define ISCSI_ISER_MAX_CONN 8
-#define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \
- ISER_QP_MAX_REQ_DTOS) * \
- ISCSI_ISER_MAX_CONN)
+#define ISER_MAX_RX_CQ_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN)
+#define ISER_MAX_TX_CQ_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN)
static void iser_cq_tasklet_fn(unsigned long data);
static void iser_cq_callback(struct ib_cq *cq, void *cq_context);
@@ -67,15 +66,23 @@
if (IS_ERR(device->pd))
goto pd_err;
- device->cq = ib_create_cq(device->ib_device,
+ device->rx_cq = ib_create_cq(device->ib_device,
iser_cq_callback,
iser_cq_event_callback,
(void *)device,
- ISER_MAX_CQ_LEN, 0);
- if (IS_ERR(device->cq))
- goto cq_err;
+ ISER_MAX_RX_CQ_LEN, 0);
+ if (IS_ERR(device->rx_cq))
+ goto rx_cq_err;
- if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP))
+ device->tx_cq = ib_create_cq(device->ib_device,
+ NULL, iser_cq_event_callback,
+ (void *)device,
+ ISER_MAX_TX_CQ_LEN, 0);
+
+ if (IS_ERR(device->tx_cq))
+ goto tx_cq_err;
+
+ if (ib_req_notify_cq(device->rx_cq, IB_CQ_NEXT_COMP))
goto cq_arm_err;
tasklet_init(&device->cq_tasklet,
@@ -93,8 +100,10 @@
dma_mr_err:
tasklet_kill(&device->cq_tasklet);
cq_arm_err:
- ib_destroy_cq(device->cq);
-cq_err:
+ ib_destroy_cq(device->tx_cq);
+tx_cq_err:
+ ib_destroy_cq(device->rx_cq);
+rx_cq_err:
ib_dealloc_pd(device->pd);
pd_err:
iser_err("failed to allocate an IB resource\n");
@@ -112,11 +121,13 @@
tasklet_kill(&device->cq_tasklet);
(void)ib_dereg_mr(device->mr);
- (void)ib_destroy_cq(device->cq);
+ (void)ib_destroy_cq(device->tx_cq);
+ (void)ib_destroy_cq(device->rx_cq);
(void)ib_dealloc_pd(device->pd);
device->mr = NULL;
- device->cq = NULL;
+ device->tx_cq = NULL;
+ device->rx_cq = NULL;
device->pd = NULL;
}
@@ -179,8 +190,8 @@
init_attr.event_handler = iser_qp_event_callback;
init_attr.qp_context = (void *)ib_conn;
- init_attr.send_cq = device->cq;
- init_attr.recv_cq = device->cq;
+ init_attr.send_cq = device->tx_cq;
+ init_attr.recv_cq = device->rx_cq;
init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS;
init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN;
@@ -772,18 +783,8 @@
static void iser_handle_comp_error(struct iser_desc *desc,
struct iser_conn *ib_conn)
{
- struct iser_rx_desc *rx = (struct iser_rx_desc *)desc;
- struct iser_rx_desc *rx_first = ib_conn->rx_descs;
- struct iser_rx_desc *rx_last = rx_first + (ISER_QP_MAX_RECV_DTOS - 1);
-
- if ((char *)desc == ib_conn->login_buf ||
- (rx_first <= rx && rx <= rx_last))
- ib_conn->post_recv_buf_count--;
- else { /* type is TX control/command/dataout */
- if (desc->type == ISCSI_TX_DATAOUT)
- kmem_cache_free(ig.desc_cache, desc);
- atomic_dec(&ib_conn->post_send_buf_count);
- }
+ if (desc && desc->type == ISCSI_TX_DATAOUT)
+ kmem_cache_free(ig.desc_cache, desc);
if (ib_conn->post_recv_buf_count == 0 &&
atomic_read(&ib_conn->post_send_buf_count) == 0) {
@@ -804,37 +805,74 @@
}
}
+static int iser_drain_tx_cq(struct iser_device *device)
+{
+ struct ib_cq *cq = device->tx_cq;
+ struct ib_wc wc;
+ struct iser_desc *tx_desc;
+ struct iser_conn *ib_conn;
+ int completed_tx = 0;
+
+ while (ib_poll_cq(cq, 1, &wc) == 1) {
+ tx_desc = (struct iser_desc *) (unsigned long) wc.wr_id;
+ ib_conn = wc.qp->qp_context;
+ if (wc.status == IB_WC_SUCCESS) {
+ if (wc.opcode == IB_WC_SEND)
+ iser_snd_completion(tx_desc);
+ else
+ iser_err("expected opcode %d got %d\n",
+ IB_WC_SEND, wc.opcode);
+ } else {
+ iser_err("tx id %llx status %d vend_err %x\n",
+ wc.wr_id, wc.status, wc.vendor_err);
+ atomic_dec(&ib_conn->post_send_buf_count);
+ iser_handle_comp_error(tx_desc, ib_conn);
+ }
+ completed_tx++;
+ }
+ return completed_tx;
+}
+
+
static void iser_cq_tasklet_fn(unsigned long data)
{
struct iser_device *device = (struct iser_device *)data;
- struct ib_cq *cq = device->cq;
+ struct ib_cq *cq = device->rx_cq;
struct ib_wc wc;
- struct iser_desc *desc;
+ struct iser_rx_desc *desc;
unsigned long xfer_len;
struct iser_conn *ib_conn;
+ int completed_tx, completed_rx;
+ completed_tx = completed_rx = 0;
while (ib_poll_cq(cq, 1, &wc) == 1) {
- desc = (struct iser_desc *) (unsigned long) wc.wr_id;
+ desc = (struct iser_rx_desc *) (unsigned long) wc.wr_id;
BUG_ON(desc == NULL);
ib_conn = wc.qp->qp_context;
-
if (wc.status == IB_WC_SUCCESS) {
if (wc.opcode == IB_WC_RECV) {
xfer_len = (unsigned long)wc.byte_len;
- iser_rcv_completion((struct iser_rx_desc *)desc,
- xfer_len, ib_conn);
- } else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */
- iser_snd_completion(desc);
+ iser_rcv_completion(desc, xfer_len, ib_conn);
+ } else
+ iser_err("expected opcode %d got %d\n",
+ IB_WC_RECV, wc.opcode);
} else {
if (wc.status != IB_WC_WR_FLUSH_ERR)
- iser_err("id %llx status %d vend_err %x\n",
+ iser_err("rx id %llx status %d vend_err %x\n",
wc.wr_id, wc.status, wc.vendor_err);
- iser_handle_comp_error(desc, ib_conn);
+ ib_conn->post_recv_buf_count--;
+ iser_handle_comp_error(NULL, ib_conn);
}
+ completed_rx++;
+ if (!(completed_rx & 63))
+ completed_tx += iser_drain_tx_cq(device);
}
/* #warning "it is assumed here that arming CQ only once its empty" *
* " would not cause interrupts to be missed" */
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
+
+ completed_tx += iser_drain_tx_cq(device);
+ iser_dbg("got %d rx %d tx completions\n", completed_rx, completed_tx);
}
static void iser_cq_callback(struct ib_cq *cq, void *cq_context)
