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cxgb4: Deal with wrap-around of queue for Work request 

The WR headers  may not fit within one descriptor.
So we need to deal with wrap-around here.

Based on original patch by Pranjal Joshi <pjoshi@chelsio.com>

Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hariprasad Shenai 2015-12-08 10:09:15 +05:30 committed by David S. Miller
parent 126fca643e
commit 8d0557d27d
1 changed files with 53 additions and 4 deletions
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57
drivers/net/ethernet/chelsio/cxgb4/sge.c
View File

@ -1029,6 +1029,30 @@ static void inline_tx_skb(const struct sk_buff *skb, const struct sge_txq *q,
*p = 0;
}
static void *inline_tx_skb_header(const struct sk_buff *skb,
const struct sge_txq *q, void *pos,
int length)
{
u64 *p;
int left = (void *)q->stat - pos;
if (likely(length <= left)) {
memcpy(pos, skb->data, length);
pos += length;
} else {
memcpy(pos, skb->data, left);
memcpy(q->desc, skb->data + left, length - left);
pos = (void *)q->desc + (length - left);
}
/* 0-pad to multiple of 16 */
p = PTR_ALIGN(pos, 8);
if ((uintptr_t)p & 8) {
*p = 0;
return p + 1;
}
return p;
}
/*
* Figure out what HW csum a packet wants and return the appropriate control
* bits.
@ -1561,9 +1585,11 @@ static void ofldtxq_stop(struct sge_ofld_txq *q, struct sk_buff *skb)
*/
static void service_ofldq(struct sge_ofld_txq *q)
{
u64 *pos;
u64 *pos, *before, *end;
int credits;
struct sk_buff *skb;
struct sge_txq *txq;
unsigned int left;
unsigned int written = 0;
unsigned int flits, ndesc;
@ -1607,9 +1633,32 @@ static void service_ofldq(struct sge_ofld_txq *q)
} else {
int last_desc, hdr_len = skb_transport_offset(skb);
memcpy(pos, skb->data, hdr_len);
write_sgl(skb, &q->q, (void *)pos + hdr_len,
pos + flits, hdr_len,
/* The WR headers may not fit within one descriptor.
* So we need to deal with wrap-around here.
*/
before = (u64 *)pos;
end = (u64 *)pos + flits;
txq = &q->q;
pos = (void *)inline_tx_skb_header(skb, &q->q,
(void *)pos,
hdr_len);
if (before > (u64 *)pos) {
left = (u8 *)end - (u8 *)txq->stat;
end = (void *)txq->desc + left;
}
/* If current position is already at the end of the
* ofld queue, reset the current to point to
* start of the queue and update the end ptr as well.
*/
if (pos == (u64 *)txq->stat) {
left = (u8 *)end - (u8 *)txq->stat;
end = (void *)txq->desc + left;
pos = (void *)txq->desc;
}
write_sgl(skb, &q->q, (void *)pos,
end, hdr_len,
(dma_addr_t *)skb->head);
#ifdef CONFIG_NEED_DMA_MAP_STATE
skb->dev = q->adap->port[0];