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s390/qdio: allow for non-contiguous SBAL array in init_data

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Upper-layer drivers allocate their SBALs by calling qdio_alloc_buffers()
for each individual queue. But when later passing the SBAL addresses to
qdio_establish(), they need to be in a single array of pointers.
So if the driver uses multiple Input or Output queues, it needs to
allocate a temporary array just to present all its SBAL pointers in this
layout.

This patch slightly changes the format of the QDIO initialization data,
so that drivers can pass a per-queue array where each element points to
a queue's SBAL array.
zfcp doesn't use multiple queues, so the impact there is trivial.
For qeth this brings a nice reduction in complexity, and removes
a page-sized allocation.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Julian Wiedmann
2020-03-20 14:00:00 +01:00
committed by Vasily Gorbik
parent ad96401cdb
commit d8564e19da
5 changed files with 25 additions and 63 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/s390/net/qeth_core.h
View File

@@ -181,11 +181,12 @@ struct qeth_vnicc_info {
/*****************************************************************************/
/* QDIO queue and buffer handling */
/*****************************************************************************/
#define QETH_MAX_QUEUES 4
#define QETH_MAX_OUT_QUEUES 4
#define QETH_IQD_MIN_TXQ 2 /* One for ucast, one for mcast. */
#define QETH_IQD_MCAST_TXQ 0
#define QETH_IQD_MIN_UCAST_TXQ 1
#define QETH_MAX_IN_QUEUES 2
#define QETH_RX_COPYBREAK (PAGE_SIZE >> 1)
#define QETH_IN_BUF_SIZE_DEFAULT 65536
#define QETH_IN_BUF_COUNT_DEFAULT 64
@@ -539,7 +540,7 @@ struct qeth_qdio_info {
/* output */
int no_out_queues;
struct qeth_qdio_out_q *out_qs[QETH_MAX_QUEUES];
struct qeth_qdio_out_q *out_qs[QETH_MAX_OUT_QUEUES];
struct qdio_outbuf_state *out_bufstates;
/* priority queueing */

59
drivers/s390/net/qeth_core_main.c
View File

@@ -4812,28 +4812,13 @@ out:
return;
}
static void qeth_qdio_establish_cq(struct qeth_card *card,
struct qdio_buffer **in_sbal_ptrs)
{
int i;
if (card->options.cq == QETH_CQ_ENABLED) {
int offset = 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] =
card->qdio.c_q->bufs[i].buffer;
}
}
static int qeth_qdio_establish(struct qeth_card *card)
{
struct qdio_buffer **out_sbal_ptrs[QETH_MAX_OUT_QUEUES];
struct qdio_buffer **in_sbal_ptrs[QETH_MAX_IN_QUEUES];
struct qdio_initialize init_data;
char *qib_param_field;
struct qdio_buffer **in_sbal_ptrs;
struct qdio_buffer **out_sbal_ptrs;
int i, j, k;
unsigned int i;
int rc = 0;
QETH_CARD_TEXT(card, 2, "qdioest");
@@ -4847,32 +4832,12 @@ static int qeth_qdio_establish(struct qeth_card *card)
qeth_create_qib_param_field(card, qib_param_field);
qeth_create_qib_param_field_blkt(card, qib_param_field);
in_sbal_ptrs = kcalloc(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;
}
in_sbal_ptrs[0] = card->qdio.in_q->qdio_bufs;
if (card->options.cq == QETH_CQ_ENABLED)
in_sbal_ptrs[1] = card->qdio.c_q->qdio_bufs;
for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; i++)
in_sbal_ptrs[i] = card->qdio.in_q->bufs[i].buffer;
qeth_qdio_establish_cq(card, in_sbal_ptrs);
out_sbal_ptrs =
kcalloc(card->qdio.no_out_queues * QDIO_MAX_BUFFERS_PER_Q,
sizeof(void *),
GFP_KERNEL);
if (!out_sbal_ptrs) {
rc = -ENOMEM;
goto out_free_in_sbals;
}
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] =
card->qdio.out_qs[i]->bufs[j]->buffer;
for (i = 0; i < card->qdio.no_out_queues; i++)
out_sbal_ptrs[i] = card->qdio.out_qs[i]->qdio_bufs;
memset(&init_data, 0, sizeof(struct qdio_initialize));
init_data.cdev = CARD_DDEV(card);
@@ -4917,10 +4882,6 @@ static int qeth_qdio_establish(struct qeth_card *card)
break;
}
out:
kfree(out_sbal_ptrs);
out_free_in_sbals:
kfree(in_sbal_ptrs);
out_free_qib_param:
kfree(qib_param_field);
out_free_nothing:
return rc;
@@ -5986,7 +5947,7 @@ static struct net_device *qeth_alloc_netdev(struct qeth_card *card)
switch (card->info.type) {
case QETH_CARD_TYPE_IQD:
dev = alloc_netdev_mqs(sizeof(*priv), "hsi%d", NET_NAME_UNKNOWN,
ether_setup, QETH_MAX_QUEUES, 1);
ether_setup, QETH_MAX_OUT_QUEUES, 1);
break;
case QETH_CARD_TYPE_OSM:
dev = alloc_etherdev(sizeof(*priv));
@@ -5996,7 +5957,7 @@ static struct net_device *qeth_alloc_netdev(struct qeth_card *card)
ether_setup);
break;
default:
dev = alloc_etherdev_mqs(sizeof(*priv), QETH_MAX_QUEUES, 1);
dev = alloc_etherdev_mqs(sizeof(*priv), QETH_MAX_OUT_QUEUES, 1);
}
if (!dev)