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Commit 49f2186d authored by Ron Mercer's avatar Ron Mercer Committed by David S. Miller
Browse files

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: default avatarRon Mercer <ron.mercer@qlogic.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8587ea35

drivers/net/qlge/qlge_main.c

+12 −5
Original line number Diff line number Diff line
@@ -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;

	}

}