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authorDavid S. Miller <davem@sunset.davemloft.net>2007-07-11 18:14:41 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-16 04:04:09 -0700
commitcb4812358423e7ea47d2b6471918d65238452cc5 (patch)
treebaa325ecdec9ee88542a5e2350ecf48c3dc88d05 /arch/sparc64
parent5a606b72a4309a656cd1a19ad137dc5557c4b8ea (diff)
downloadlinux-2.6.34-ux500-cb4812358423e7ea47d2b6471918d65238452cc5.tar.gz
[SPARC64]: Assorted LDC bug cures.
1) LDC_MODE_RELIABLE is deprecated an unused by anything, plus it and LDC_MODE_STREAM were mis-numbered. 2) read_stream() should try to read as much as possible into the per-LDC stream buffer area, so do not trim the read_nonraw() length by the caller's size parameter. 3) Send data ACKs when necessary in read_nonraw(). 4) In read_nonraw() when we get a pure ACK, advance the RX head unconditionally past it. 5) Provide the ACKID field in the ldcdgb() packet dump in read_nonraw(). This helps debugging stream mode LDC channel problems. 6) Decrease verbosity of rx_data_wait() so that it is more useful. A debugging message each loop iteration is too much. 7) In process_data_ack() stop the loop checking when we hit lp->tx_tail not lp->tx_head. 8) Set the seqid field properly in send_data_nack(). Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/kernel/ldc.c56
1 files changed, 38 insertions, 18 deletions
diff --git a/arch/sparc64/kernel/ldc.c b/arch/sparc64/kernel/ldc.c
index 0fa04d6f978..4cba2868596 100644
--- a/arch/sparc64/kernel/ldc.c
+++ b/arch/sparc64/kernel/ldc.c
@@ -239,8 +239,7 @@ static struct ldc_packet *handshake_get_tx_packet(struct ldc_channel *lp,
*/
static unsigned long head_for_data(struct ldc_channel *lp)
{
- if (lp->cfg.mode == LDC_MODE_RELIABLE ||
- lp->cfg.mode == LDC_MODE_STREAM)
+ if (lp->cfg.mode == LDC_MODE_STREAM)
return lp->tx_acked;
return lp->tx_head;
}
@@ -494,7 +493,7 @@ static int send_data_nack(struct ldc_channel *lp, struct ldc_packet *data_pkt)
p->type = data_pkt->type;
p->stype = LDC_NACK;
p->ctrl = data_pkt->ctrl & LDC_CTRL_MSK;
- p->seqid = lp->snd_nxt;
+ p->seqid = lp->snd_nxt + 1;
p->u.r.ackid = lp->rcv_nxt;
ldcdbg(HS, "SEND DATA NACK type[0x%x] ctl[0x%x] seq[0x%x] ack[0x%x]\n",
@@ -765,7 +764,7 @@ static int process_data_ack(struct ldc_channel *lp,
lp->tx_acked = head;
return 0;
}
- if (head == lp->tx_head)
+ if (head == lp->tx_tail)
return ldc_abort(lp);
}
@@ -1093,11 +1092,6 @@ struct ldc_channel *ldc_alloc(unsigned long id,
mss = LDC_PACKET_SIZE - 8;
break;
- case LDC_MODE_RELIABLE:
- mops = &nonraw_ops;
- mss = LDC_PACKET_SIZE - 8 - 8;
- break;
-
case LDC_MODE_STREAM:
mops = &stream_ops;
mss = LDC_PACKET_SIZE - 8 - 8;
@@ -1579,15 +1573,14 @@ static int rx_data_wait(struct ldc_channel *lp, unsigned long cur_head)
if (hv_err)
return ldc_abort(lp);
- ldcdbg(DATA, "REREAD head[%lx] tail[%lx] chan_state[%lx]\n",
- dummy, lp->rx_tail, lp->chan_state);
-
if (lp->chan_state == LDC_CHANNEL_DOWN ||
lp->chan_state == LDC_CHANNEL_RESETTING)
return -ECONNRESET;
if (cur_head != lp->rx_tail) {
- ldcdbg(DATA, "DATA WAIT DONE\n");
+ ldcdbg(DATA, "DATA WAIT DONE "
+ "head[%lx] tail[%lx] chan_state[%lx]\n",
+ dummy, lp->rx_tail, lp->chan_state);
return 0;
}
@@ -1607,6 +1600,28 @@ static int rx_set_head(struct ldc_channel *lp, unsigned long head)
return 0;
}
+static void send_data_ack(struct ldc_channel *lp)
+{
+ unsigned long new_tail;
+ struct ldc_packet *p;
+
+ p = data_get_tx_packet(lp, &new_tail);
+ if (likely(p)) {
+ int err;
+
+ memset(p, 0, sizeof(*p));
+ p->type = LDC_DATA;
+ p->stype = LDC_ACK;
+ p->ctrl = 0;
+ p->seqid = lp->snd_nxt + 1;
+ p->u.r.ackid = lp->rcv_nxt;
+
+ err = send_tx_packet(lp, p, new_tail);
+ if (!err)
+ lp->snd_nxt++;
+ }
+}
+
static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size)
{
struct ldc_packet *first_frag;
@@ -1637,13 +1652,14 @@ static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size)
BUG_ON(new == lp->rx_tail);
p = lp->rx_base + (new / LDC_PACKET_SIZE);
- ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x] "
+ ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] "
"rcv_nxt[%08x]\n",
p->type,
p->stype,
p->ctrl,
p->env,
p->seqid,
+ p->u.r.ackid,
lp->rcv_nxt);
if (unlikely(!rx_seq_ok(lp, p->seqid))) {
@@ -1672,6 +1688,9 @@ static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size)
}
if (!(p->stype & LDC_INFO)) {
new = rx_advance(lp, new);
+ err = rx_set_head(lp, new);
+ if (err)
+ break;
goto no_data;
}
@@ -1748,8 +1767,11 @@ no_data:
if (err && first_frag)
lp->rcv_nxt = first_frag->seqid - 1;
- if (!err)
+ if (!err) {
err = copied;
+ if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE)
+ send_data_ack(lp);
+ }
return err;
}
@@ -1770,9 +1792,7 @@ static int write_stream(struct ldc_channel *lp, const void *buf,
static int read_stream(struct ldc_channel *lp, void *buf, unsigned int size)
{
if (!lp->mssbuf_len) {
- int err = read_nonraw(lp, lp->mssbuf,
- (size > lp->cfg.mtu ?
- lp->cfg.mtu : size));
+ int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu);
if (err < 0)
return err;