qeth: exploit asynchronous delivery of storage blocks

This patch exploits the QDIO support for asynchronous delivery of storage
blocks for Hipersockets. The exploitation is not configured per default and
may be enabled via the function qeth_configure_cq.

Signed-off-by: Einar Lueck <elelueck@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/qeth_core.h

@@ -110,6 +110,10 @@ struct qeth_perf_stats {
 
 	unsigned int sc_dp_p;
 	unsigned int sc_p_dp;
+	/* qdio_cq_handler: number of times called, time spent in */
+	__u64 cq_start_time;
+	unsigned int cq_cnt;
+	unsigned int cq_time;
 	/* qdio_input_handler: number of times called, time spent in */
 	__u64 inbound_start_time;
 	unsigned int inbound_cnt;
@@ -376,6 +380,11 @@ enum qeth_qdio_buffer_states {
 	 * outbound: filled by driver; owned by hardware in order to be sent
 	 */
 	QETH_QDIO_BUF_PRIMED,
+	/*
+	 * inbound: not applicable
+	 * outbound: handled via transfer pending / completion queue
+	 */
+	QETH_QDIO_BUF_HANDLED_DELAYED,
 };
 
 enum qeth_qdio_info_states {
@@ -413,8 +422,11 @@ struct qeth_qdio_out_buffer {
 	atomic_t state;
 	int next_element_to_fill;
 	struct sk_buff_head skb_list;
-	struct list_head ctx_list;
 	int is_header[16];
+
+	struct qaob *aob;
+	struct qeth_qdio_out_q *q;
+	struct qeth_qdio_out_buffer *next_pending;
 };
 
 struct qeth_card;
@@ -427,7 +439,8 @@ enum qeth_out_q_states {
 
 struct qeth_qdio_out_q {
 	struct qdio_buffer qdio_bufs[QDIO_MAX_BUFFERS_PER_Q];
-	struct qeth_qdio_out_buffer bufs[QDIO_MAX_BUFFERS_PER_Q];
+	struct qeth_qdio_out_buffer *bufs[QDIO_MAX_BUFFERS_PER_Q];
+	struct qdio_outbuf_state *bufstates; /* convenience pointer */
 	int queue_no;
 	struct qeth_card *card;
 	atomic_t state;
@@ -448,7 +461,9 @@ struct qeth_qdio_out_q {
 struct qeth_qdio_info {
 	atomic_t state;
 	/* input */
+	int no_in_queues;
 	struct qeth_qdio_q *in_q;
+	struct qeth_qdio_q *c_q;
 	struct qeth_qdio_buffer_pool in_buf_pool;
 	struct qeth_qdio_buffer_pool init_pool;
 	int in_buf_size;
@@ -456,6 +471,7 @@ struct qeth_qdio_info {
 	/* output */
 	int no_out_queues;
 	struct qeth_qdio_out_q **out_qs;
+	struct qdio_outbuf_state *out_bufstates;
 
 	/* priority queueing */
 	int do_prio_queueing;
@@ -527,6 +543,12 @@ enum qeth_cmd_buffer_state {
 	BUF_STATE_PROCESSED,
 };
 
+enum qeth_cq {
+	QETH_CQ_DISABLED = 0,
+	QETH_CQ_ENABLED = 1,
+	QETH_CQ_NOTAVAILABLE = 2,
+};
+
 struct qeth_ipato {
 	int enabled;
 	int invert4;
@@ -651,6 +673,7 @@ struct qeth_card_options {
 	int rx_sg_cb;
 	enum qeth_ipa_isolation_modes isolation;
 	int sniffer;
+	enum qeth_cq cq;
 };
 
 /*
@@ -888,6 +911,7 @@ void qeth_dbf_longtext(debug_info_t *id, int level, char *text, ...);
 int qeth_core_ethtool_get_settings(struct net_device *, struct ethtool_cmd *);
 int qeth_set_access_ctrl_online(struct qeth_card *card);
 int qeth_hdr_chk_and_bounce(struct sk_buff *, int);
+int qeth_configure_cq(struct qeth_card *, enum qeth_cq);
 int qeth_hw_trap(struct qeth_card *, enum qeth_diags_trap_action);
 int qeth_query_ipassists(struct qeth_card *, enum qeth_prot_versions prot);