[PATCH net-next 1/3] enic: make vnic_wq_buf doubly linked
From: Govindarajulu Varadarajan <hidden>
Date: 2014-12-24 10:30:24
Subsystem:
cisco vic ethernet nic driver, networking drivers, the rest · Maintainers:
Satish Kharat, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted> --- drivers/net/ethernet/cisco/enic/vnic_wq.c | 3 +++ drivers/net/ethernet/cisco/enic/vnic_wq.h | 1 + 2 files changed, 4 insertions(+)
diff --git a/drivers/net/ethernet/cisco/enic/vnic_wq.c b/drivers/net/ethernet/cisco/enic/vnic_wq.c
index 3e6b8d5..b5a1c93 100644
--- a/drivers/net/ethernet/cisco/enic/vnic_wq.c
+++ b/drivers/net/ethernet/cisco/enic/vnic_wq.c@@ -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++; } }
diff --git a/drivers/net/ethernet/cisco/enic/vnic_wq.h b/drivers/net/ethernet/cisco/enic/vnic_wq.h
index 816f1ad..2961543 100644
--- a/drivers/net/ethernet/cisco/enic/vnic_wq.h
+++ b/drivers/net/ethernet/cisco/enic/vnic_wq.h@@ -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 */
--
2.2.1