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qlge: Optimize rx buffer refill process.

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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 <ron.mercer@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ron Mercer 2009-02-23 10:42:16 +00:00 committed by David S. Miller
parent 8587ea35ca
commit 49f2186d36
1 changed files with 12 additions and 5 deletions
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17
drivers/net/qlge/qlge_main.c
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@ -863,7 +863,8 @@ static void ql_write_cq_idx(struct rx_ring *rx_ring)
/* Process (refill) a large buffer queue. */ /* Process (refill) a large buffer queue. */
static void ql_update_lbq(struct ql_adapter *qdev, struct rx_ring *rx_ring) 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; struct bq_desc *lbq_desc;
u64 map; u64 map;
int i; 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; rx_ring->lbq_prod_idx += 16;
if (rx_ring->lbq_prod_idx == rx_ring->lbq_len) if (rx_ring->lbq_prod_idx == rx_ring->lbq_len)
rx_ring->lbq_prod_idx = 0; rx_ring->lbq_prod_idx = 0;
rx_ring->lbq_free_cnt -= 16;
}
if (start_idx != clean_idx) {
QPRINTK(qdev, RX_STATUS, DEBUG, QPRINTK(qdev, RX_STATUS, DEBUG,
"lbq: updating prod idx = %d.\n", "lbq: updating prod idx = %d.\n",
rx_ring->lbq_prod_idx); rx_ring->lbq_prod_idx);
ql_write_db_reg(rx_ring->lbq_prod_idx, ql_write_db_reg(rx_ring->lbq_prod_idx,
rx_ring->lbq_prod_idx_db_reg); rx_ring->lbq_prod_idx_db_reg);
rx_ring->lbq_free_cnt -= 16;
} }
} }
/* Process (refill) a small buffer queue. */ /* Process (refill) a small buffer queue. */
static void ql_update_sbq(struct ql_adapter *qdev, struct rx_ring *rx_ring) 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; struct bq_desc *sbq_desc;
u64 map; u64 map;
int i; 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; rx_ring->sbq_prod_idx += 16;
if (rx_ring->sbq_prod_idx == rx_ring->sbq_len) if (rx_ring->sbq_prod_idx == rx_ring->sbq_len)
rx_ring->sbq_prod_idx = 0; rx_ring->sbq_prod_idx = 0;
rx_ring->sbq_free_cnt -= 16;
}
if (start_idx != clean_idx) {
QPRINTK(qdev, RX_STATUS, DEBUG, QPRINTK(qdev, RX_STATUS, DEBUG,
"sbq: updating prod idx = %d.\n", "sbq: updating prod idx = %d.\n",
rx_ring->sbq_prod_idx); rx_ring->sbq_prod_idx);
ql_write_db_reg(rx_ring->sbq_prod_idx, ql_write_db_reg(rx_ring->sbq_prod_idx,
rx_ring->sbq_prod_idx_db_reg); rx_ring->sbq_prod_idx_db_reg);
rx_ring->sbq_free_cnt -= 16;
} }
} }