struct iser_regd_buf *regd_data;
struct iser_dto *recv_dto = NULL;
struct iser_device *device = iser_conn->ib_conn->device;
- int rx_data_size, err = 0;
-
- rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
- if (rx_desc == NULL) {
- iser_err("Failed to alloc desc for post recv\n");
- return -ENOMEM;
- }
- rx_desc->type = ISCSI_RX;
+ int rx_data_size, err;
+ int posts, outstanding_unexp_pdus;
/* for the login sequence we must support rx of upto 8K; login is done
* after conn create/bind (connect) and conn stop/bind (reconnect),
else /* FIXME till user space sets conn->max_recv_dlength correctly */
rx_data_size = 128;
- rx_desc->data = kmalloc(rx_data_size, GFP_NOIO);
- if (rx_desc->data == NULL) {
- iser_err("Failed to alloc data buf for post recv\n");
- err = -ENOMEM;
- goto post_rx_kmalloc_failure;
- }
+ outstanding_unexp_pdus =
+ atomic_xchg(&iser_conn->ib_conn->unexpected_pdu_count, 0);
- recv_dto = &rx_desc->dto;
- recv_dto->ib_conn = iser_conn->ib_conn;
- recv_dto->regd_vector_len = 0;
+ /*
+ * in addition to the response buffer, replace those consumed by
+ * unexpected pdus.
+ */
+ for (posts = 0; posts < 1 + outstanding_unexp_pdus; posts++) {
+ rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
+ if (rx_desc == NULL) {
+ iser_err("Failed to alloc desc for post recv %d\n",
+ posts);
+ err = -ENOMEM;
+ goto post_rx_cache_alloc_failure;
+ }
+ rx_desc->type = ISCSI_RX;
+ rx_desc->data = kmalloc(rx_data_size, GFP_NOIO);
+ if (rx_desc->data == NULL) {
+ iser_err("Failed to alloc data buf for post recv %d\n",
+ posts);
+ err = -ENOMEM;
+ goto post_rx_kmalloc_failure;
+ }
- regd_hdr = &rx_desc->hdr_regd_buf;
- memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
- regd_hdr->device = device;
- regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */
- regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
+ recv_dto = &rx_desc->dto;
+ recv_dto->ib_conn = iser_conn->ib_conn;
+ recv_dto->regd_vector_len = 0;
- iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE);
+ regd_hdr = &rx_desc->hdr_regd_buf;
+ memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
+ regd_hdr->device = device;
+ regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */
+ regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
- iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0);
+ iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE);
- regd_data = &rx_desc->data_regd_buf;
- memset(regd_data, 0, sizeof(struct iser_regd_buf));
- regd_data->device = device;
- regd_data->virt_addr = rx_desc->data;
- regd_data->data_size = rx_data_size;
+ iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0);
- iser_reg_single(device, regd_data, DMA_FROM_DEVICE);
+ regd_data = &rx_desc->data_regd_buf;
+ memset(regd_data, 0, sizeof(struct iser_regd_buf));
+ regd_data->device = device;
+ regd_data->virt_addr = rx_desc->data;
+ regd_data->data_size = rx_data_size;
- iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0);
+ iser_reg_single(device, regd_data, DMA_FROM_DEVICE);
- err = iser_post_recv(rx_desc);
- if (!err)
- return 0;
+ iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0);
- /* iser_post_recv failed */
+ err = iser_post_recv(rx_desc);
+ if (err) {
+ iser_err("Failed iser_post_recv for post %d\n", posts);
+ goto post_rx_post_recv_failure;
+ }
+ }
+ /* all posts successful */
+ return 0;
+
+post_rx_post_recv_failure:
iser_dto_buffs_release(recv_dto);
kfree(rx_desc->data);
post_rx_kmalloc_failure:
kmem_cache_free(ig.desc_cache, rx_desc);
+post_rx_cache_alloc_failure:
+ if (posts > 0) {
+ /*
+ * response buffer posted, but did not replace all unexpected
+ * pdu recv bufs. Ignore error, retry occurs next send
+ */
+ outstanding_unexp_pdus -= (posts - 1);
+ err = 0;
+ }
+ atomic_add(outstanding_unexp_pdus,
+ &iser_conn->ib_conn->unexpected_pdu_count);
+
return err;
}
struct iscsi_iser_conn *iser_conn = conn->dd_data;
int i;
- /* no need to keep it in a var, we are after login so if this should
- * be negotiated, by now the result should be available here */
+ /*
+ * FIXME this value should be declared to the target during login with
+ * the MaxOutstandingUnexpectedPDUs key when supported
+ */
int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS;
iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num);
int err = 0;
struct iser_regd_buf *regd_buf;
struct iser_device *device;
+ unsigned char opcode;
if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
data_seg_len);
}
- if (iser_post_receive_control(conn) != 0) {
- iser_err("post_rcv_buff failed!\n");
- err = -ENOMEM;
- goto send_control_error;
+ opcode = task->hdr->opcode & ISCSI_OPCODE_MASK;
+
+ /* post recv buffer for response if one is expected */
+ if (!(opcode == ISCSI_OP_NOOP_OUT && task->hdr->itt == RESERVED_ITT)) {
+ if (iser_post_receive_control(conn) != 0) {
+ iser_err("post_rcv_buff failed!\n");
+ err = -ENOMEM;
+ goto send_control_error;
+ }
}
err = iser_post_send(mdesc);
* 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);
+
+ /*
+ * if an unexpected PDU was received then the recv wr consumed must
+ * be replaced, this is done in the next send of a control-type PDU
+ */
+ if (opcode == ISCSI_OP_NOOP_IN && hdr->itt == RESERVED_ITT) {
+ /* nop-in with itt = 0xffffffff */
+ atomic_inc(&conn->ib_conn->unexpected_pdu_count);
+ }
+ else if (opcode == ISCSI_OP_ASYNC_EVENT) {
+ /* asyncronous message */
+ atomic_inc(&conn->ib_conn->unexpected_pdu_count);
+ }
+ /* a reject PDU consumes the recv buf posted for the response */
}
void iser_snd_completion(struct iser_desc *tx_desc)
projects / linux-block.git / commitdiff