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IB/iser: Remove atomic counter for posted receive buffers

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Now that both the posting and reaping of receive buffers is done in
the completion path, the counter of outstanding buffers not be atomic.

Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Or Gerlitz 2010-02-08 13:18:39 +00:00 committed by Roland Dreier
parent bcc60c381d
commit 704315f082
3 changed files with 12 additions and 12 deletions
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2
drivers/infiniband/ulp/iser/iscsi_iser.h
View File

@ -266,7 +266,7 @@ struct iser_conn {
struct ib_fmr_pool *fmr_pool; /* pool of IB FMRs */
int disc_evt_flag; /* disconn event delivered */
wait_queue_head_t wait; /* waitq for conn/disconn */
atomic_t post_recv_buf_count; /* posted rx count */
int post_recv_buf_count; /* posted rx count */
atomic_t post_send_buf_count; /* posted tx count */
char name[ISER_OBJECT_NAME_SIZE];
struct iser_page_vec *page_vec; /* represents SG to fmr maps*

6
drivers/infiniband/ulp/iser/iser_initiator.c
View File

@ -268,7 +268,7 @@ int iser_conn_set_full_featured_mode(struct iscsi_conn *conn)
/* Check that there is no posted recv or send buffers left - */
/* they must be consumed during the login phase */
BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0);
BUG_ON(iser_conn->ib_conn->post_recv_buf_count != 0);
BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
if (iser_alloc_rx_descriptors(iser_conn->ib_conn))
@ -569,12 +569,12 @@ void iser_rcv_completion(struct iser_rx_desc *rx_desc,
* task eliminates the need to worry on tasks which are completed in *
* parallel to the execution of iser_conn_term. So the code that waits *
* for the posted rx bufs refcount to become zero handles everything */
atomic_dec(&conn->ib_conn->post_recv_buf_count);
conn->ib_conn->post_recv_buf_count--;
if (rx_dma == ib_conn->login_dma)
return;
outstanding = atomic_read(&ib_conn->post_recv_buf_count);
outstanding = ib_conn->post_recv_buf_count;
if (outstanding + ISER_MIN_POSTED_RX <= ISER_QP_MAX_RECV_DTOS) {
count = min(ISER_QP_MAX_RECV_DTOS - outstanding,
ISER_MIN_POSTED_RX);

16
drivers/infiniband/ulp/iser/iser_verbs.c
View File

@ -453,7 +453,7 @@ static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
ISCSI_ERR_CONN_FAILED);
/* Complete the termination process if no posts are pending */
if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) &&
if (ib_conn->post_recv_buf_count == 0 &&
(atomic_read(&ib_conn->post_send_buf_count) == 0)) {
ib_conn->state = ISER_CONN_DOWN;
wake_up_interruptible(&ib_conn->wait);
@ -500,7 +500,7 @@ void iser_conn_init(struct iser_conn *ib_conn)
{
ib_conn->state = ISER_CONN_INIT;
init_waitqueue_head(&ib_conn->wait);
atomic_set(&ib_conn->post_recv_buf_count, 0);
ib_conn->post_recv_buf_count = 0;
atomic_set(&ib_conn->post_send_buf_count, 0);
atomic_set(&ib_conn->refcount, 1);
INIT_LIST_HEAD(&ib_conn->conn_list);
@ -651,11 +651,11 @@ int iser_post_recvl(struct iser_conn *ib_conn)
rx_wr.num_sge = 1;
rx_wr.next = NULL;
atomic_inc(&ib_conn->post_recv_buf_count);
ib_conn->post_recv_buf_count++;
ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed);
if (ib_ret) {
iser_err("ib_post_recv failed ret=%d\n", ib_ret);
atomic_dec(&ib_conn->post_recv_buf_count);
ib_conn->post_recv_buf_count--;
}
return ib_ret;
}
@ -679,11 +679,11 @@ int iser_post_recvm(struct iser_conn *ib_conn, int count)
rx_wr--;
rx_wr->next = NULL; /* mark end of work requests list */
atomic_add(count, &ib_conn->post_recv_buf_count);
ib_conn->post_recv_buf_count += count;
ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed);
if (ib_ret) {
iser_err("ib_post_recv failed ret=%d\n", ib_ret);
atomic_sub(count, &ib_conn->post_recv_buf_count);
ib_conn->post_recv_buf_count -= count;
} else
ib_conn->rx_desc_head = my_rx_head;
return ib_ret;
@ -778,14 +778,14 @@ static void iser_handle_comp_error(struct iser_desc *desc,
if ((char *)desc == ib_conn->login_buf ||
(rx_first <= rx && rx <= rx_last))
atomic_dec(&ib_conn->post_recv_buf_count);
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 (atomic_read(&ib_conn->post_recv_buf_count) == 0 &&
if (ib_conn->post_recv_buf_count == 0 &&
atomic_read(&ib_conn->post_send_buf_count) == 0) {
/* getting here when the state is UP means that the conn is *
* being terminated asynchronously from the iSCSI layer's *