[patch 10/11] [PATCH] qeth: exploit asynchronous delivery of storage blocks

frank.blaschka
2011-07-27T16:12:52Z

[-- Attachment #1: net1117_qeth_cq.patch --]
[-- Type: text/plain, Size: 28254 bytes --]

From: Einar Lueck <elelueck@de.ibm.com>

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>
---
drivers/s390/net/qeth_core.h | 28 +-
drivers/s390/net/qeth_core_main.c | 495 ++++++++++++++++++++++++++++++++++----
2 files changed, 480 insertions(+), 43 deletions(-)

--- a/drivers/s390/net/qeth_core.h
+++ b/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 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);

--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -44,6 +44,7 @@ struct qeth_card_list_struct qeth_core_c
EXPORT_SYMBOL_GPL(qeth_core_card_list);
struct kmem_cache *qeth_core_header_cache;
EXPORT_SYMBOL_GPL(qeth_core_header_cache);
+static struct kmem_cache *qeth_qdio_outbuf_cache;

static struct device *qeth_core_root_dev;
static unsigned int known_devices[][6] = QETH_MODELLIST_ARRAY;
@@ -56,6 +57,10 @@ static struct qeth_cmd_buffer *qeth_get_
static void qeth_setup_ccw(struct qeth_channel *, unsigned char *, __u32);
static void qeth_free_buffer_pool(struct qeth_card *);
static int qeth_qdio_establish(struct qeth_card *);
+static void qeth_free_qdio_buffers(struct qeth_card *);
+static void qeth_clear_output_buffer(struct qeth_qdio_out_q *queue,
+ struct qeth_qdio_out_buffer *buf,
+ enum qeth_qdio_buffer_states newbufstate);

static inline const char *qeth_get_cardname(struct qeth_card *card)
@@ -239,6 +244,150 @@ int qeth_realloc_buffer_pool(struct qeth
}
EXPORT_SYMBOL_GPL(qeth_realloc_buffer_pool);

+static inline int qeth_cq_init(struct qeth_card *card)
+{
+ int rc;
+
+ if (card->options.cq == QETH_CQ_ENABLED) {
+ QETH_DBF_TEXT(SETUP, 2, "cqinit");
+ memset(card->qdio.c_q->qdio_bufs, 0,
+ QDIO_MAX_BUFFERS_PER_Q * sizeof(struct qdio_buffer));
+ card->qdio.c_q->next_buf_to_init = 127;
+ rc = do_QDIO(CARD_DDEV(card), QDIO_FLAG_SYNC_INPUT,
+ card->qdio.no_in_queues - 1, 0,
+ 127);
+ if (rc) {
+ QETH_DBF_TEXT_(SETUP, 2, "1err%d", rc);
+ goto out;
+ }
+ }
+ rc = 0;
+out:
+ return rc;
+}
+
+static inline int qeth_alloc_cq(struct qeth_card *card)
+{
+ int rc;
+
+ if (card->options.cq == QETH_CQ_ENABLED) {
+ int i;
+ struct qdio_outbuf_state *outbuf_states;
+
+ QETH_DBF_TEXT(SETUP, 2, "cqon");
+ card->qdio.c_q = kzalloc(sizeof(struct qeth_qdio_q),
+ GFP_KERNEL);
+ if (!card->qdio.c_q) {
+ rc = -1;
+ goto kmsg_out;
+ }
+ QETH_DBF_HEX(SETUP, 2, &card->qdio.c_q, sizeof(void *));
+
+ for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; ++i) {
+ card->qdio.c_q->bufs[i].buffer =
+ &card->qdio.c_q->qdio_bufs[i];
+ }
+
+ card->qdio.no_in_queues = 2;
+
+ card->qdio.out_bufstates = (struct qdio_outbuf_state *)
+ kzalloc(card->qdio.no_out_queues *
+ QDIO_MAX_BUFFERS_PER_Q *
+ sizeof(struct qdio_outbuf_state), GFP_KERNEL);
+ outbuf_states = card->qdio.out_bufstates;
+ if (outbuf_states == NULL) {
+ rc = -1;
+ goto free_cq_out;
+ }
+ for (i = 0; i < card->qdio.no_out_queues; ++i) {
+ card->qdio.out_qs[i]->bufstates = outbuf_states;
+ outbuf_states += QDIO_MAX_BUFFERS_PER_Q;
+ }
+ } else {
+ QETH_DBF_TEXT(SETUP, 2, "nocq");
+ card->qdio.c_q = NULL;
+ card->qdio.no_in_queues = 1;
+ }
+ QETH_DBF_TEXT_(SETUP, 2, "iqc%d", card->qdio.no_in_queues);
+ rc = 0;
+out:
+ return rc;
+free_cq_out:
+ kfree(card->qdio.c_q);
+ card->qdio.c_q = NULL;
+kmsg_out:
+ dev_err(&card->gdev->dev, "Failed to create completion queue\n");
+ goto out;
+}
+
+static inline void qeth_free_cq(struct qeth_card *card)
+{
+ if (card->qdio.c_q) {
+ --card->qdio.no_in_queues;
+ kfree(card->qdio.c_q);
+ card->qdio.c_q = NULL;
+ }
+ kfree(card->qdio.out_bufstates);
+ card->qdio.out_bufstates = NULL;
+}
+
+static inline void qeth_cleanup_handled_pending(struct qeth_qdio_out_q *q,
+ int bidx, int forced_cleanup)
+{
+ if (q->bufs[bidx]->next_pending != NULL) {
+ struct qeth_qdio_out_buffer *head = q->bufs[bidx];
+ struct qeth_qdio_out_buffer *c = q->bufs[bidx]->next_pending;
+
+ while (c) {
+ if (forced_cleanup ||
+ atomic_read(&c->state) ==
+ QETH_QDIO_BUF_HANDLED_DELAYED) {
+ struct qeth_qdio_out_buffer *f = c;
+ QETH_CARD_TEXT(f->q->card, 5, "fp");
+ QETH_CARD_TEXT_(f->q->card, 5, "%lx", (long) f);
+ c = f->next_pending;
+ BUG_ON(head->next_pending != f);
+ head->next_pending = c;
+ kmem_cache_free(qeth_qdio_outbuf_cache, f);
+ } else {
+ head = c;
+ c = c->next_pending;
+ }
+
+ }
+ }
+}
+
+
+static inline void qeth_qdio_handle_aob(struct qeth_card *card,
+ unsigned long phys_aob_addr) {
+ struct qaob *aob;
+ struct qeth_qdio_out_buffer *buffer;
+
+ aob = (struct qaob *) phys_to_virt(phys_aob_addr);
+ QETH_CARD_TEXT(card, 5, "haob");
+ QETH_CARD_TEXT_(card, 5, "%lx", phys_aob_addr);
+ buffer = (struct qeth_qdio_out_buffer *) aob->user1;
+ QETH_CARD_TEXT_(card, 5, "%lx", aob->user1);
+
+ BUG_ON(buffer == NULL);
+
+ buffer->aob = NULL;
+ qeth_clear_output_buffer(buffer->q, buffer,
+ QETH_QDIO_BUF_HANDLED_DELAYED);
+ /* from here on: do not touch buffer anymore */
+ qdio_release_aob(aob);
+}
+
+static inline int qeth_is_cq(struct qeth_card *card, unsigned int queue)
+{
+ return card->options.cq == QETH_CQ_ENABLED &&
+ card->qdio.c_q != NULL &&
+ queue != 0 &&
+ queue == card->qdio.no_in_queues - 1;
+}
+
+
static int qeth_issue_next_read(struct qeth_card *card)
{
int rc;
@@ -681,6 +830,7 @@ EXPORT_SYMBOL_GPL(qeth_do_run_thread);
void qeth_schedule_recovery(struct qeth_card *card)
{
QETH_CARD_TEXT(card, 2, "startrec");
+ WARN_ON(1);
if (qeth_set_thread_start_bit(card, QETH_RECOVER_THREAD) == 0)
schedule_work(&card->kernel_thread_starter);
}
@@ -884,7 +1034,8 @@ out:
}

static void qeth_clear_output_buffer(struct qeth_qdio_out_q *queue,
- struct qeth_qdio_out_buffer *buf)
+ struct qeth_qdio_out_buffer *buf,
+ enum qeth_qdio_buffer_states newbufstate)
{
int i;
struct sk_buff *skb;
@@ -912,21 +1063,36 @@ static void qeth_clear_output_buffer(str
buf->buffer->element[15].eflags = 0;
buf->buffer->element[15].sflags = 0;
buf->next_element_to_fill = 0;
- atomic_set(&buf->state, QETH_QDIO_BUF_EMPTY);
+ atomic_set(&buf->state, newbufstate);
+}
+
+static void qeth_clear_outq_buffers(struct qeth_qdio_out_q *q, int free)
+{
+ int j;
+
+ for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) {
+ if (!q->bufs[j])
+ continue;
+ qeth_cleanup_handled_pending(q, j, free);
+ qeth_clear_output_buffer(q, q->bufs[j], QETH_QDIO_BUF_EMPTY);
+ if (free) {
+ kmem_cache_free(qeth_qdio_outbuf_cache, q->bufs[j]);
+ q->bufs[j] = NULL;
+ }
+ }
}

void qeth_clear_qdio_buffers(struct qeth_card *card)
{
- int i, j;
+ int i;

QETH_CARD_TEXT(card, 2, "clearqdbf");
/* clear outbound buffers to free skbs */
- for (i = 0; i < card->qdio.no_out_queues; ++i)
+ for (i = 0; i < card->qdio.no_out_queues; ++i) {
if (card->qdio.out_qs[i]) {
- for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j)
- qeth_clear_output_buffer(card->qdio.out_qs[i],
- &card->qdio.out_qs[i]->bufs[j]);
+ qeth_clear_outq_buffers(card->qdio.out_qs[i], 0);
}
+ }
}
EXPORT_SYMBOL_GPL(qeth_clear_qdio_buffers);

@@ -945,11 +1111,14 @@ static void qeth_free_buffer_pool(struct

static void qeth_free_qdio_buffers(struct qeth_card *card)
{
- int i, j;
+ int i;

if (atomic_xchg(&card->qdio.state, QETH_QDIO_UNINITIALIZED) ==
QETH_QDIO_UNINITIALIZED)
return;
+
+ qeth_free_cq(card);
+
kfree(card->qdio.in_q);
card->qdio.in_q = NULL;
/* inbound buffer pool */
@@ -957,9 +1126,7 @@ static void qeth_free_qdio_buffers(struc
/* free outbound qdio_qs */
if (card->qdio.out_qs) {
for (i = 0; i < card->qdio.no_out_queues; ++i) {
- for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j)
- qeth_clear_output_buffer(card->qdio.out_qs[i],
- &card->qdio.out_qs[i]->bufs[j]);
+ qeth_clear_outq_buffers(card->qdio.out_qs[i], 1);
kfree(card->qdio.out_qs[i]);
}
kfree(card->qdio.out_qs);
@@ -1051,6 +1218,7 @@ static void qeth_set_intial_options(stru
card->options.performance_stats = 0;
card->options.rx_sg_cb = QETH_RX_SG_CB;
card->options.isolation = ISOLATION_MODE_NONE;
+ card->options.cq = QETH_CQ_DISABLED;
}

static int qeth_do_start_thread(struct qeth_card *card, unsigned long thread)
@@ -1180,6 +1348,7 @@ static int qeth_determine_card_type(stru
card->info.type = known_devices[i][QETH_DEV_MODEL_IND];
card->qdio.no_out_queues =
known_devices[i][QETH_QUEUE_NO_IND];
+ card->qdio.no_in_queues = 1;
card->info.is_multicast_different =
known_devices[i][QETH_MULTICAST_IND];
qeth_get_channel_path_desc(card);
@@ -2027,6 +2196,37 @@ static int qeth_ulp_setup(struct qeth_ca
return rc;
}

+static int qeth_init_qdio_out_buf(struct qeth_qdio_out_q *q, int bidx)
+{
+ int rc;
+ struct qeth_qdio_out_buffer *newbuf;
+
+ rc = 0;
+ newbuf = kmem_cache_zalloc(qeth_qdio_outbuf_cache, GFP_ATOMIC);
+ if (!newbuf) {
+ rc = -ENOMEM;
+ goto out;
+ }
+ newbuf->buffer = &q->qdio_bufs[bidx];
+ skb_queue_head_init(&newbuf->skb_list);
+ lockdep_set_class(&newbuf->skb_list.lock, &qdio_out_skb_queue_key);
+ newbuf->q = q;
+ newbuf->aob = NULL;
+ newbuf->next_pending = q->bufs[bidx];
+ atomic_set(&newbuf->state, QETH_QDIO_BUF_EMPTY);
+ q->bufs[bidx] = newbuf;
+ if (q->bufstates) {
+ q->bufstates[bidx].user = newbuf;
+ QETH_CARD_TEXT_(q->card, 2, "nbs%d", bidx);
+ QETH_CARD_TEXT_(q->card, 2, "%lx", (long) newbuf);
+ QETH_CARD_TEXT_(q->card, 2, "%lx",
+ (long) newbuf->next_pending);
+ }
+out:
+ return rc;
+}
+
+
static int qeth_alloc_qdio_buffers(struct qeth_card *card)
{
int i, j;
@@ -2038,7 +2238,7 @@ static int qeth_alloc_qdio_buffers(struc
return 0;

card->qdio.in_q = kmalloc(sizeof(struct qeth_qdio_q),
- GFP_KERNEL);
+ GFP_KERNEL);
if (!card->qdio.in_q)
goto out_nomem;
QETH_DBF_TEXT(SETUP, 2, "inq");
@@ -2051,6 +2251,7 @@ static int qeth_alloc_qdio_buffers(struc
/* inbound buffer pool */
if (qeth_alloc_buffer_pool(card))
goto out_freeinq;
+
/* outbound */
card->qdio.out_qs =
kmalloc(card->qdio.no_out_queues *
@@ -2068,21 +2269,30 @@ static int qeth_alloc_qdio_buffers(struc
card->qdio.out_qs[i]->queue_no = i;
/* give outbound qeth_qdio_buffers their qdio_buffers */
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) {
- card->qdio.out_qs[i]->bufs[j].buffer =
- &card->qdio.out_qs[i]->qdio_bufs[j];
- skb_queue_head_init(&card->qdio.out_qs[i]->bufs[j].
- skb_list);
- lockdep_set_class(
- &card->qdio.out_qs[i]->bufs[j].skb_list.lock,
- &qdio_out_skb_queue_key);
- INIT_LIST_HEAD(&card->qdio.out_qs[i]->bufs[j].ctx_list);
+ BUG_ON(card->qdio.out_qs[i]->bufs[j] != NULL);
+ if (qeth_init_qdio_out_buf(card->qdio.out_qs[i], j))
+ goto out_freeoutqbufs;
}
}
+
+ /* completion */
+ if (qeth_alloc_cq(card))
+ goto out_freeoutq;
+
return 0;

+out_freeoutqbufs:
+ while (j > 0) {
+ --j;
+ kmem_cache_free(qeth_qdio_outbuf_cache,
+ card->qdio.out_qs[i]->bufs[j]);
+ card->qdio.out_qs[i]->bufs[j] = NULL;
+ }
out_freeoutq:
- while (i > 0)
+ while (i > 0) {
kfree(card->qdio.out_qs[--i]);
+ qeth_clear_outq_buffers(card->qdio.out_qs[i], 1);
+ }
kfree(card->qdio.out_qs);
card->qdio.out_qs = NULL;
out_freepool:
@@ -2399,13 +2609,21 @@ int qeth_init_qdio_queues(struct qeth_ca
QETH_DBF_TEXT_(SETUP, 2, "1err%d", rc);
return rc;
}
+
+ /* completion */
+ rc = qeth_cq_init(card);
+ if (rc) {
+ return rc;
+ }
+
/* outbound queue */
for (i = 0; i < card->qdio.no_out_queues; ++i) {
memset(card->qdio.out_qs[i]->qdio_bufs, 0,
QDIO_MAX_BUFFERS_PER_Q * sizeof(struct qdio_buffer));
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) {
qeth_clear_output_buffer(card->qdio.out_qs[i],
- &card->qdio.out_qs[i]->bufs[j]);
+ card->qdio.out_qs[i]->bufs[j],
+ QETH_QDIO_BUF_EMPTY);
}
card->qdio.out_qs[i]->card = card;
card->qdio.out_qs[i]->next_buf_to_fill = 0;
@@ -2787,8 +3005,6 @@ void qeth_queue_input_buffer(struct qeth
qeth_get_micros() -
card->perf_stats.inbound_do_qdio_start_time;
if (rc) {
- dev_warn(&card->gdev->dev,
- "QDIO reported an error, rc=%i\n", rc);
QETH_CARD_TEXT(card, 2, "qinberr");
}
queue->next_buf_to_init = (queue->next_buf_to_init + count) %
@@ -2862,12 +3078,12 @@ static int qeth_switch_to_nonpacking_if_
queue->card->perf_stats.sc_p_dp++;
queue->do_pack = 0;
/* flush packing buffers */
- buffer = &queue->bufs[queue->next_buf_to_fill];
+ buffer = queue->bufs[queue->next_buf_to_fill];
if ((atomic_read(&buffer->state) ==
QETH_QDIO_BUF_EMPTY) &&
(buffer->next_element_to_fill > 0)) {
atomic_set(&buffer->state,
- QETH_QDIO_BUF_PRIMED);
+ QETH_QDIO_BUF_PRIMED);
flush_count++;
queue->next_buf_to_fill =
(queue->next_buf_to_fill + 1) %
@@ -2878,6 +3094,7 @@ static int qeth_switch_to_nonpacking_if_
return flush_count;
}

+
/*
* Called to flush a packing buffer if no more pci flags are on the queue.
* Checks if there is a packing buffer and prepares it to be flushed.
@@ -2887,7 +3104,7 @@ static int qeth_flush_buffers_on_no_pci(
{
struct qeth_qdio_out_buffer *buffer;

- buffer = &queue->bufs[queue->next_buf_to_fill];
+ buffer = queue->bufs[queue->next_buf_to_fill];
if ((atomic_read(&buffer->state) == QETH_QDIO_BUF_EMPTY) &&
(buffer->next_element_to_fill > 0)) {
/* it's a packing buffer */
@@ -2908,10 +3125,14 @@ static void qeth_flush_buffers(struct qe
unsigned int qdio_flags;

for (i = index; i < index + count; ++i) {
- buf = &queue->bufs[i % QDIO_MAX_BUFFERS_PER_Q];
+ int bidx = i % QDIO_MAX_BUFFERS_PER_Q;
+ buf = queue->bufs[bidx];
buf->buffer->element[buf->next_element_to_fill - 1].eflags |=
SBAL_EFLAGS_LAST_ENTRY;

+ if (queue->bufstates)
+ queue->bufstates[bidx].user = buf;
+
if (queue->card->info.type == QETH_CARD_TYPE_IQD)
continue;

@@ -2963,6 +3184,9 @@ static void qeth_flush_buffers(struct qe
if (rc == QDIO_ERROR_SIGA_TARGET)
return;
QETH_CARD_TEXT(queue->card, 2, "flushbuf");
+ QETH_CARD_TEXT_(queue->card, 2, " q%d", queue->queue_no);
+ QETH_CARD_TEXT_(queue->card, 2, " idx%d", index);
+ QETH_CARD_TEXT_(queue->card, 2, " c%d", count);
QETH_CARD_TEXT_(queue->card, 2, " err%d", rc);

/* this must not happen under normal circumstances. if it
@@ -3024,14 +3248,120 @@ void qeth_qdio_start_poll(struct ccw_dev
}
EXPORT_SYMBOL_GPL(qeth_qdio_start_poll);

+int qeth_configure_cq(struct qeth_card *card, enum qeth_cq cq)
+{
+ int rc;
+
+ if (card->options.cq == QETH_CQ_NOTAVAILABLE) {
+ rc = -1;
+ goto out;
+ } else {
+ if (card->options.cq == cq) {
+ rc = 0;
+ goto out;
+ }
+
+ if (card->state != CARD_STATE_DOWN &&
+ card->state != CARD_STATE_RECOVER) {
+ rc = -1;
+ goto out;
+ }
+
+ qeth_free_qdio_buffers(card);
+ card->options.cq = cq;
+ rc = 0;
+ }
+out:
+ return rc;
+
+}
+EXPORT_SYMBOL_GPL(qeth_configure_cq);
+
+
+static void qeth_qdio_cq_handler(struct qeth_card *card,
+ unsigned int qdio_err,
+ unsigned int queue, int first_element, int count) {
+ struct qeth_qdio_q *cq = card->qdio.c_q;
+ int i;
+ int rc;
+
+ if (!qeth_is_cq(card, queue))
+ goto out;
+
+ QETH_CARD_TEXT_(card, 5, "qcqhe%d", first_element);
+ QETH_CARD_TEXT_(card, 5, "qcqhc%d", count);
+ QETH_CARD_TEXT_(card, 5, "qcqherr%d", qdio_err);
+
+ if (qdio_err) {
+ netif_stop_queue(card->dev);
+ qeth_schedule_recovery(card);
+ goto out;
+ }
+
+ if (card->options.performance_stats) {
+ card->perf_stats.cq_cnt++;
+ card->perf_stats.cq_start_time = qeth_get_micros();
+ }
+
+ for (i = first_element; i < first_element + count; ++i) {
+ int bidx = i % QDIO_MAX_BUFFERS_PER_Q;
+ struct qdio_buffer *buffer = &cq->qdio_bufs[bidx];
+ int e;
+
+ e = 0;
+ while (buffer->element[e].addr) {
+ unsigned long phys_aob_addr;
+
+ phys_aob_addr = (unsigned long) buffer->element[e].addr;
+ qeth_qdio_handle_aob(card, phys_aob_addr);
+ buffer->element[e].addr = NULL;
+ buffer->element[e].eflags = 0;
+ buffer->element[e].sflags = 0;
+ buffer->element[e].length = 0;
+
+ ++e;
+ }
+
+ buffer->element[15].eflags = 0;
+ buffer->element[15].sflags = 0;
+ }
+ rc = do_QDIO(CARD_DDEV(card), QDIO_FLAG_SYNC_INPUT, queue,
+ card->qdio.c_q->next_buf_to_init,
+ count);
+ if (rc) {
+ dev_warn(&card->gdev->dev,
+ "QDIO reported an error, rc=%i\n", rc);
+ QETH_CARD_TEXT(card, 2, "qcqherr");
+ }
+ card->qdio.c_q->next_buf_to_init = (card->qdio.c_q->next_buf_to_init
+ + count) % QDIO_MAX_BUFFERS_PER_Q;
+
+ netif_wake_queue(card->dev);
+
+ if (card->options.performance_stats) {
+ int delta_t = qeth_get_micros();
+ delta_t -= card->perf_stats.cq_start_time;
+ card->perf_stats.cq_time += delta_t;
+ }
+out:
+ return;
+}
+
void qeth_qdio_input_handler(struct ccw_device *ccwdev, unsigned int qdio_err,
- unsigned int queue, int first_element, int count,
+ unsigned int queue, int first_elem, int count,
unsigned long card_ptr)
{
struct qeth_card *card = (struct qeth_card *)card_ptr;

- if (qdio_err)
+ QETH_CARD_TEXT_(card, 2, "qihq%d", queue);
+ QETH_CARD_TEXT_(card, 2, "qiec%d", qdio_err);
+
+ if (qeth_is_cq(card, queue))
+ qeth_qdio_cq_handler(card, qdio_err, queue, first_elem, count);
+ else if (qdio_err)
qeth_schedule_recovery(card);
+
+
}
EXPORT_SYMBOL_GPL(qeth_qdio_input_handler);

@@ -3057,9 +3387,26 @@ void qeth_qdio_output_handler(struct ccw
qeth_get_micros();
}
for (i = first_element; i < (first_element + count); ++i) {
- buffer = &queue->bufs[i % QDIO_MAX_BUFFERS_PER_Q];
+ int bidx = i % QDIO_MAX_BUFFERS_PER_Q;
+ buffer = queue->bufs[bidx];
qeth_handle_send_error(card, buffer, qdio_error);
- qeth_clear_output_buffer(queue, buffer);
+
+ if (queue->bufstates &&
+ (queue->bufstates[bidx].flags &
+ QDIO_OUTBUF_STATE_FLAG_PENDING) != 0) {
+ buffer->aob = queue->bufstates[bidx].aob;
+ QETH_CARD_TEXT_(queue->card, 5, "pel%d", bidx);
+ QETH_CARD_TEXT_(queue->card, 5, "aob");
+ QETH_CARD_TEXT_(queue->card, 5, "%lx",
+ virt_to_phys(buffer->aob));
+ BUG_ON(bidx < 0 || bidx >= QDIO_MAX_BUFFERS_PER_Q);
+ if (qeth_init_qdio_out_buf(queue, bidx))
+ qeth_schedule_recovery(card);
+ } else {
+ qeth_clear_output_buffer(queue, buffer,
+ QETH_QDIO_BUF_EMPTY);
+ }
+ qeth_cleanup_handled_pending(queue, bidx, 0);
}
atomic_sub(count, &queue->used_buffers);
/* check if we need to do something on this outbound queue */
@@ -3291,7 +3638,7 @@ int qeth_do_send_packet_fast(struct qeth
QETH_OUT_Q_LOCKED) != QETH_OUT_Q_UNLOCKED);
/* ... now we've got the queue */
index = queue->next_buf_to_fill;
- buffer = &queue->bufs[queue->next_buf_to_fill];
+ buffer = queue->bufs[queue->next_buf_to_fill];
/*
* check if buffer is empty to make sure that we do not 'overtake'
* ourselves and try to fill a buffer that is already primed
@@ -3325,7 +3672,7 @@ int qeth_do_send_packet(struct qeth_card
while (atomic_cmpxchg(&queue->state, QETH_OUT_Q_UNLOCKED,
QETH_OUT_Q_LOCKED) != QETH_OUT_Q_UNLOCKED);
start_index = queue->next_buf_to_fill;
- buffer = &queue->bufs[queue->next_buf_to_fill];
+ buffer = queue->bufs[queue->next_buf_to_fill];
/*
* check if buffer is empty to make sure that we do not 'overtake'
* ourselves and try to fill a buffer that is already primed
@@ -3347,7 +3694,7 @@ int qeth_do_send_packet(struct qeth_card
queue->next_buf_to_fill =
(queue->next_buf_to_fill + 1) %
QDIO_MAX_BUFFERS_PER_Q;
- buffer = &queue->bufs[queue->next_buf_to_fill];
+ buffer = queue->bufs[queue->next_buf_to_fill];
/* we did a step forward, so check buffer state
* again */
if (atomic_read(&buffer->state) !=
@@ -3925,6 +4272,20 @@ static void qeth_determine_capabilities(
if (rc)
QETH_DBF_TEXT_(SETUP, 2, "6err%d", rc);

+ QETH_DBF_TEXT_(SETUP, 2, "qfmt%d", card->ssqd.qfmt);
+ QETH_DBF_TEXT_(SETUP, 2, "%d", card->ssqd.qdioac1);
+ QETH_DBF_TEXT_(SETUP, 2, "%d", card->ssqd.qdioac3);
+ QETH_DBF_TEXT_(SETUP, 2, "icnt%d", card->ssqd.icnt);
+ if (!((card->ssqd.qfmt != QDIO_IQDIO_QFMT) ||
+ ((card->ssqd.qdioac1 & CHSC_AC1_INITIATE_INPUTQ) == 0) ||
+ ((card->ssqd.qdioac3 & CHSC_AC3_FORMAT2_CQ_AVAILABLE) == 0))) {
+ dev_info(&card->gdev->dev,
+ "Completion Queueing supported\n");
+ } else {
+ card->options.cq = QETH_CQ_NOTAVAILABLE;
+ }
+
+
out_offline:
if (ddev_offline == 1)
ccw_device_set_offline(ddev);
@@ -3932,6 +4293,24 @@ out:
return;
}

+static inline void qeth_qdio_establish_cq(struct qeth_card *card,
+ struct qdio_buffer **in_sbal_ptrs,
+ void (**queue_start_poll) (struct ccw_device *, int, unsigned long)) {
+ int i;
+
+ if (card->options.cq == QETH_CQ_ENABLED) {
+ int offset = QDIO_MAX_BUFFERS_PER_Q *
+ (card->qdio.no_in_queues - 1);
+ i = QDIO_MAX_BUFFERS_PER_Q * (card->qdio.no_in_queues - 1);
+ for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; ++i) {
+ in_sbal_ptrs[offset + i] = (struct qdio_buffer *)
+ virt_to_phys(card->qdio.c_q->bufs[i].buffer);
+ }
+
+ queue_start_poll[card->qdio.no_in_queues - 1] = NULL;
+ }
+}
+
static int qeth_qdio_establish(struct qeth_card *card)
{
struct qdio_initialize init_data;
@@ -3954,22 +4333,28 @@ static int qeth_qdio_establish(struct qe
qeth_create_qib_param_field(card, qib_param_field);
qeth_create_qib_param_field_blkt(card, qib_param_field);

- in_sbal_ptrs = kmalloc(QDIO_MAX_BUFFERS_PER_Q * sizeof(void *),
+ in_sbal_ptrs = kmalloc(card->qdio.no_in_queues *
+ QDIO_MAX_BUFFERS_PER_Q * sizeof(void *),
GFP_KERNEL);
if (!in_sbal_ptrs) {
rc = -ENOMEM;
goto out_free_qib_param;
}
- for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; ++i)
+ for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; ++i) {
in_sbal_ptrs[i] = (struct qdio_buffer *)
virt_to_phys(card->qdio.in_q->bufs[i].buffer);
+ }

- queue_start_poll = kmalloc(sizeof(void *) * 1, GFP_KERNEL);
+ queue_start_poll = kzalloc(sizeof(void *) * card->qdio.no_in_queues,
+ GFP_KERNEL);
if (!queue_start_poll) {
rc = -ENOMEM;
goto out_free_in_sbals;
}
- queue_start_poll[0] = card->discipline.start_poll;
+ for (i = 0; i < card->qdio.no_in_queues; ++i)
+ queue_start_poll[i] = card->discipline.start_poll;
+
+ qeth_qdio_establish_cq(card, in_sbal_ptrs, queue_start_poll);

out_sbal_ptrs =
kmalloc(card->qdio.no_out_queues * QDIO_MAX_BUFFERS_PER_Q *
@@ -3981,7 +4366,7 @@ static int qeth_qdio_establish(struct qe
for (i = 0, k = 0; i < card->qdio.no_out_queues; ++i)
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j, ++k) {
out_sbal_ptrs[k] = (struct qdio_buffer *)virt_to_phys(
- card->qdio.out_qs[i]->bufs[j].buffer);
+ card->qdio.out_qs[i]->bufs[j]->buffer);
}

memset(&init_data, 0, sizeof(struct qdio_initialize));
@@ -3989,7 +4374,7 @@ static int qeth_qdio_establish(struct qe
init_data.q_format = qeth_get_qdio_q_format(card);
init_data.qib_param_field_format = 0;
init_data.qib_param_field = qib_param_field;
- init_data.no_input_qs = 1;
+ init_data.no_input_qs = card->qdio.no_in_queues;
init_data.no_output_qs = card->qdio.no_out_queues;
init_data.input_handler = card->discipline.input_handler;
init_data.output_handler = card->discipline.output_handler;
@@ -3997,6 +4382,7 @@ static int qeth_qdio_establish(struct qe
init_data.int_parm = (unsigned long) card;
init_data.input_sbal_addr_array = (void **) in_sbal_ptrs;
init_data.output_sbal_addr_array = (void **) out_sbal_ptrs;
+ init_data.output_sbal_state_array = card->qdio.out_bufstates;
init_data.scan_threshold =
(card->info.type == QETH_CARD_TYPE_IQD) ? 8 : 32;

@@ -4013,6 +4399,17 @@ static int qeth_qdio_establish(struct qe
qdio_free(CARD_DDEV(card));
}
}
+
+ switch (card->options.cq) {
+ case QETH_CQ_ENABLED:
+ dev_info(&card->gdev->dev, "Completion Queue support enabled");
+ break;
+ case QETH_CQ_DISABLED:
+ dev_info(&card->gdev->dev, "Completion Queue support disabled");
+ break;
+ default:
+ break;
+ }
out:
kfree(out_sbal_ptrs);
out_free_queue_start_poll:
@@ -4191,6 +4588,8 @@ static inline int qeth_create_skb_frag(s
(*pskb)->truesize += data_len;
(*pfrag)++;
}
+
+
return 0;
}

@@ -4664,6 +5063,8 @@ static struct {
{"tx do_QDIO count"},
{"tx csum"},
{"tx lin"},
+ {"cq handler count"},
+ {"cq handler time"}
};

int qeth_core_get_sset_count(struct net_device *dev, int stringset)
@@ -4722,6 +5123,8 @@ void qeth_core_get_ethtool_stats(struct
data[32] = card->perf_stats.outbound_do_qdio_cnt;
data[33] = card->perf_stats.tx_csum;
data[34] = card->perf_stats.tx_lin;
+ data[35] = card->perf_stats.cq_cnt;
+ data[36] = card->perf_stats.cq_time;
}
EXPORT_SYMBOL_GPL(qeth_core_get_ethtool_stats);

@@ -4880,7 +5283,16 @@ static int __init qeth_core_init(void)
goto slab_err;
}

+ qeth_qdio_outbuf_cache = kmem_cache_create("qeth_buf",
+ sizeof(struct qeth_qdio_out_buffer), 0, 0, NULL);
+ if (!qeth_qdio_outbuf_cache) {
+ rc = -ENOMEM;
+ goto cqslab_err;
+ }
+
return 0;
+cqslab_err:
+ kmem_cache_destroy(qeth_core_header_cache);
slab_err:
root_device_unregister(qeth_core_root_dev);
register_err:
@@ -4905,6 +5317,7 @@ static void __exit qeth_core_exit(void)
&driver_attr_group);
ccwgroup_driver_unregister(&qeth_core_ccwgroup_driver);
ccw_driver_unregister(&qeth_ccw_driver);
+ kmem_cache_destroy(qeth_qdio_outbuf_cache);
kmem_cache_destroy(qeth_core_header_cache);
qeth_unregister_dbf_views();
pr_info("core functions removed\n");