be2net: support TX batching using skb->xmit_more flag
This patch uses skb->xmit_more flag to batch TX requests.
TX is flushed either when xmit_more is false or there is
no more space in the TXQ.
Skyhawk-R and BEx chips require an even number of wrbs to be posted.
So, when a batch of TX requests is accumulated, the last header wrb
may need to be fixed with an extra dummy wrb.
This patch refactors be_xmit() routine as a sequence of be_xmit_enqueue()
and be_xmit_flush() calls. The Tx completion code is also
updated to be able to unmap/free a batch of skbs rather than a single
skb.
Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index 712e7f8..9fa2569 100644
--- a/drivers/net/ethernet/emulex/benet/be.h
+++ b/drivers/net/ethernet/emulex/benet/be.h
@@ -243,7 +243,6 @@
u64 tx_bytes;
u64 tx_pkts;
u64 tx_reqs;
- u64 tx_wrbs;
u64 tx_compl;
ulong tx_jiffies;
u32 tx_stops;
@@ -266,6 +265,9 @@
/* Remember the skbs that were transmitted */
struct sk_buff *sent_skb_list[TX_Q_LEN];
struct be_tx_stats stats;
+ u16 pend_wrb_cnt; /* Number of WRBs yet to be given to HW */
+ u16 last_req_wrb_cnt; /* wrb cnt of the last req in the Q */
+ u16 last_req_hdr; /* index of the last req's hdr-wrb */
} ____cacheline_aligned_in_smp;
/* Struct to remember the pages posted for rx frags */
