From: Ron Mercer Date: Mon, 23 Feb 2009 10:42:16 +0000 (+0000) Subject: qlge: Optimize rx buffer refill process. X-Git-Tag: v2.6.30-rc1~662^2~564 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=49f2186d36a88ae6f7dd8261aff2cf80409af28d;p=~shefty%2Frdma-dev.git qlge: Optimize rx buffer refill process. RX Buffers are refilled in chunks of 16 at a time before notifying the hardware with a register write. This can cause several writes to take place in a given napi poll call. This change causes the write to take place only once at the end of the call. Signed-off-by: Ron Mercer Signed-off-by: David S. Miller --- diff --git a/drivers/net/qlge/qlge_main.c b/drivers/net/qlge/qlge_main.c index 16c056a62fc..17198459918 100644 --- a/drivers/net/qlge/qlge_main.c +++ b/drivers/net/qlge/qlge_main.c @@ -863,7 +863,8 @@ static void ql_write_cq_idx(struct rx_ring *rx_ring) /* Process (refill) a large buffer queue. */ static void ql_update_lbq(struct ql_adapter *qdev, struct rx_ring *rx_ring) { - int clean_idx = rx_ring->lbq_clean_idx; + u32 clean_idx = rx_ring->lbq_clean_idx; + u32 start_idx = clean_idx; struct bq_desc *lbq_desc; u64 map; int i; @@ -910,19 +911,23 @@ static void ql_update_lbq(struct ql_adapter *qdev, struct rx_ring *rx_ring) rx_ring->lbq_prod_idx += 16; if (rx_ring->lbq_prod_idx == rx_ring->lbq_len) rx_ring->lbq_prod_idx = 0; + rx_ring->lbq_free_cnt -= 16; + } + + if (start_idx != clean_idx) { QPRINTK(qdev, RX_STATUS, DEBUG, "lbq: updating prod idx = %d.\n", rx_ring->lbq_prod_idx); ql_write_db_reg(rx_ring->lbq_prod_idx, rx_ring->lbq_prod_idx_db_reg); - rx_ring->lbq_free_cnt -= 16; } } /* Process (refill) a small buffer queue. */ static void ql_update_sbq(struct ql_adapter *qdev, struct rx_ring *rx_ring) { - int clean_idx = rx_ring->sbq_clean_idx; + u32 clean_idx = rx_ring->sbq_clean_idx; + u32 start_idx = clean_idx; struct bq_desc *sbq_desc; u64 map; int i; @@ -972,13 +977,15 @@ static void ql_update_sbq(struct ql_adapter *qdev, struct rx_ring *rx_ring) rx_ring->sbq_prod_idx += 16; if (rx_ring->sbq_prod_idx == rx_ring->sbq_len) rx_ring->sbq_prod_idx = 0; + rx_ring->sbq_free_cnt -= 16; + } + + if (start_idx != clean_idx) { QPRINTK(qdev, RX_STATUS, DEBUG, "sbq: updating prod idx = %d.\n", rx_ring->sbq_prod_idx); ql_write_db_reg(rx_ring->sbq_prod_idx, rx_ring->sbq_prod_idx_db_reg); - - rx_ring->sbq_free_cnt -= 16; } }