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Fix NTBT_QP_LINKS negotiation.

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I believe it never worked correctly for more the one queue even in Linux.
This fixes case when one of consumer drivers is not loaded on one side,
but its queues still announced as ready if something else brought link up.

While there, remove some pointless NULL checks.
This commit is contained in:
Alexander Motin 2016-07-29 21:03:30 +00:00
parent adaf3c4906
commit 718e8abba9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=303514
1 changed files with 18 additions and 29 deletions
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47
sys/dev/ntb/ntb_transport.c
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@ -572,9 +572,6 @@ ntb_transport_free_queue(struct ntb_transport_qp *qp)
struct ntb_transport_ctx *nt = qp->transport;
struct ntb_queue_entry *entry;
if (qp == NULL)
return;
callout_drain(&qp->link_work);
ntb_db_set_mask(qp->dev, 1ull << qp->qp_num);
@ -694,7 +691,7 @@ ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
struct ntb_queue_entry *entry;
int rc;
if (qp == NULL || !qp->link_is_up || len == 0) {
if (!qp->link_is_up || len == 0) {
CTR0(KTR_NTB, "TX: link not up");
return (EINVAL);
}
@ -1059,11 +1056,9 @@ ntb_transport_link_work(void *arg)
size >> 32);
ntb_peer_spad_write(dev, NTBT_MW0_SZ_LOW + (i * 2), size);
}
ntb_peer_spad_write(dev, NTBT_NUM_MWS, nt->mw_count);
ntb_peer_spad_write(dev, NTBT_NUM_QPS, nt->qp_count);
ntb_peer_spad_write(dev, NTBT_QP_LINKS, 0);
ntb_peer_spad_write(dev, NTBT_VERSION, NTB_TRANSPORT_VERSION);
/* Query the remote side for its info */
@ -1245,16 +1240,18 @@ ntb_qp_link_work(void *arg)
struct ntb_transport_qp *qp = arg;
device_t dev = qp->dev;
struct ntb_transport_ctx *nt = qp->transport;
uint32_t val, dummy;
int i;
uint32_t val;
ntb_spad_read(dev, NTBT_QP_LINKS, &val);
ntb_peer_spad_write(dev, NTBT_QP_LINKS, val | (1ull << qp->qp_num));
/* query remote spad for qp ready bits */
ntb_peer_spad_read(dev, NTBT_QP_LINKS, &dummy);
/* Report queues that are up on our side */
for (i = 0, val = 0; i < nt->qp_count; i++) {
if (nt->qp_vec[i].client_ready)
val |= (1 << i);
}
ntb_peer_spad_write(dev, NTBT_QP_LINKS, val);
/* See if the remote side is up */
ntb_spad_read(dev, NTBT_QP_LINKS, &val);
if ((val & (1ull << qp->qp_num)) != 0) {
ntb_printf(2, "qp %d link up\n", qp->qp_num);
qp->link_is_up = true;
@ -1350,17 +1347,16 @@ ntb_qp_link_cleanup(struct ntb_transport_qp *qp)
void
ntb_transport_link_down(struct ntb_transport_qp *qp)
{
struct ntb_transport_ctx *nt = qp->transport;
int i;
uint32_t val;
if (qp == NULL)
return;
qp->client_ready = false;
ntb_spad_read(qp->dev, NTBT_QP_LINKS, &val);
ntb_peer_spad_write(qp->dev, NTBT_QP_LINKS,
val & ~(1 << qp->qp_num));
for (i = 0, val = 0; i < nt->qp_count; i++) {
if (nt->qp_vec[i].client_ready)
val |= (1 << i);
}
ntb_peer_spad_write(qp->dev, NTBT_QP_LINKS, val);
if (qp->link_is_up)
ntb_send_link_down(qp);
@ -1379,8 +1375,6 @@ ntb_transport_link_down(struct ntb_transport_qp *qp)
bool
ntb_transport_link_query(struct ntb_transport_qp *qp)
{
if (qp == NULL)
return (false);
return (qp->link_is_up);
}
@ -1479,8 +1473,6 @@ ntb_list_mv(struct mtx *lock, struct ntb_queue_list *from,
*/
unsigned char ntb_transport_qp_num(struct ntb_transport_qp *qp)
{
if (qp == NULL)
return 0;
return (qp->qp_num);
}
@ -1497,9 +1489,6 @@ unsigned int
ntb_transport_max_size(struct ntb_transport_qp *qp)
{
if (qp == NULL)
return (0);
return (qp->tx_max_frame - sizeof(struct ntb_payload_header));
}