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enic: make vnic_wq_buf doubly linked

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This patch makes vnic_wq_buf doubly liked list. This is needed for dma_mapping
error check, in case some frag's dma map fails, we need to move back and remove
previously queued buffers.

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Govindarajulu Varadarajan 2014-12-24 15:59:36 +05:30 committed by David S. Miller
parent 5164172f33
commit 5e32066d00
2 changed files with 4 additions and 0 deletions
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3
drivers/net/ethernet/cisco/enic/vnic_wq.c
View file

@ -47,11 +47,14 @@ static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
wq->ring.desc_size * buf->index;
if (buf->index + 1 == count) {
buf->next = wq->bufs[0];
buf->next->prev = buf;
break;
} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
buf->next = wq->bufs[i + 1];
buf->next->prev = buf;
} else {
buf->next = buf + 1;
buf->next->prev = buf;
buf++;
}
}

1
drivers/net/ethernet/cisco/enic/vnic_wq.h
View file

@ -62,6 +62,7 @@ struct vnic_wq_buf {
uint8_t cq_entry; /* Gets completion event from hw */
uint8_t desc_skip_cnt; /* Num descs to occupy */
uint8_t compressed_send; /* Both hdr and payload in one desc */
struct vnic_wq_buf *prev;
};
/* Break the vnic_wq_buf allocations into blocks of 32/64 entries */