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Date: Thu, 5 Sep 2013 22:13:09 +0200
From: Michal Schmidt <mschmidt@...hat.com>
To: netdev@...r.kernel.org
Cc: Ariel Elior <ariele@...adcom.com>,
Eilon Greenstein <eilong@...adcom.com>,
David Miller <davem@...emloft.net>
Subject: [PATCH] bnx2x: avoid atomic allocations during initialization
During initialization bnx2x allocates significant amounts of memory
(for rx data, rx SGEs, TPA pool) using atomic allocations.
I received a report where bnx2x failed to allocate SGEs and it had
to fall back to TPA-less operation.
Let's use GFP_KERNEL allocations during initialization, which runs
in process context. Add gfp_t parameters to functions that are used
both in initialization and in the receive path.
Use an unlikely branch in bnx2x_frag_alloc() to avoid atomic allocation
by netdev_alloc_frag(). The branch is taken several thousands of times
during initialization, but then never more. Note that fp->rx_frag_size
is never greater than PAGE_SIZE, so __get_free_page() can be used here.
Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
---
drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 38 +++++++++++++++----------
1 file changed, 23 insertions(+), 15 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 8d726f6..884e8ad 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -484,10 +484,10 @@ static void bnx2x_set_gro_params(struct sk_buff *skb, u16 parsing_flags,
NAPI_GRO_CB(skb)->count = num_of_coalesced_segs;
}
-static int bnx2x_alloc_rx_sge(struct bnx2x *bp,
- struct bnx2x_fastpath *fp, u16 index)
+static int bnx2x_alloc_rx_sge(struct bnx2x *bp, struct bnx2x_fastpath *fp,
+ u16 index, gfp_t gfp_mask)
{
- struct page *page = alloc_pages(GFP_ATOMIC, PAGES_PER_SGE_SHIFT);
+ struct page *page = alloc_pages(gfp_mask, PAGES_PER_SGE_SHIFT);
struct sw_rx_page *sw_buf = &fp->rx_page_ring[index];
struct eth_rx_sge *sge = &fp->rx_sge_ring[index];
dma_addr_t mapping;
@@ -566,7 +566,7 @@ static int bnx2x_fill_frag_skb(struct bnx2x *bp, struct bnx2x_fastpath *fp,
/* If we fail to allocate a substitute page, we simply stop
where we are and drop the whole packet */
- err = bnx2x_alloc_rx_sge(bp, fp, sge_idx);
+ err = bnx2x_alloc_rx_sge(bp, fp, sge_idx, GFP_ATOMIC);
if (unlikely(err)) {
bnx2x_fp_qstats(bp, fp)->rx_skb_alloc_failed++;
return err;
@@ -610,12 +610,17 @@ static void bnx2x_frag_free(const struct bnx2x_fastpath *fp, void *data)
kfree(data);
}
-static void *bnx2x_frag_alloc(const struct bnx2x_fastpath *fp)
+static void *bnx2x_frag_alloc(const struct bnx2x_fastpath *fp, gfp_t gfp_mask)
{
- if (fp->rx_frag_size)
+ if (fp->rx_frag_size) {
+ /* GFP_KERNEL allocations are used only during initialization */
+ if (unlikely(gfp_mask & __GFP_WAIT))
+ return (void *)__get_free_page(gfp_mask);
+
return netdev_alloc_frag(fp->rx_frag_size);
+ }
- return kmalloc(fp->rx_buf_size + NET_SKB_PAD, GFP_ATOMIC);
+ return kmalloc(fp->rx_buf_size + NET_SKB_PAD, gfp_mask);
}
#ifdef CONFIG_INET
@@ -695,7 +700,7 @@ static void bnx2x_tpa_stop(struct bnx2x *bp, struct bnx2x_fastpath *fp,
goto drop;
/* Try to allocate the new data */
- new_data = bnx2x_frag_alloc(fp);
+ new_data = bnx2x_frag_alloc(fp, GFP_ATOMIC);
/* Unmap skb in the pool anyway, as we are going to change
pool entry status to BNX2X_TPA_STOP even if new skb allocation
fails. */
@@ -746,15 +751,15 @@ drop:
bnx2x_fp_stats(bp, fp)->eth_q_stats.rx_skb_alloc_failed++;
}
-static int bnx2x_alloc_rx_data(struct bnx2x *bp,
- struct bnx2x_fastpath *fp, u16 index)
+static int bnx2x_alloc_rx_data(struct bnx2x *bp, struct bnx2x_fastpath *fp,
+ u16 index, gfp_t gfp_mask)
{
u8 *data;
struct sw_rx_bd *rx_buf = &fp->rx_buf_ring[index];
struct eth_rx_bd *rx_bd = &fp->rx_desc_ring[index];
dma_addr_t mapping;
- data = bnx2x_frag_alloc(fp);
+ data = bnx2x_frag_alloc(fp, gfp_mask);
if (unlikely(data == NULL))
return -ENOMEM;
@@ -947,7 +952,8 @@ int bnx2x_rx_int(struct bnx2x_fastpath *fp, int budget)
memcpy(skb->data, data + pad, len);
bnx2x_reuse_rx_data(fp, bd_cons, bd_prod);
} else {
- if (likely(bnx2x_alloc_rx_data(bp, fp, bd_prod) == 0)) {
+ if (likely(bnx2x_alloc_rx_data(bp, fp, bd_prod,
+ GFP_ATOMIC) == 0)) {
dma_unmap_single(&bp->pdev->dev,
dma_unmap_addr(rx_buf, mapping),
fp->rx_buf_size,
@@ -1307,7 +1313,8 @@ void bnx2x_init_rx_rings(struct bnx2x *bp)
struct sw_rx_bd *first_buf =
&tpa_info->first_buf;
- first_buf->data = bnx2x_frag_alloc(fp);
+ first_buf->data =
+ bnx2x_frag_alloc(fp, GFP_KERNEL);
if (!first_buf->data) {
BNX2X_ERR("Failed to allocate TPA skb pool for queue[%d] - disabling TPA on this queue!\n",
j);
@@ -1329,7 +1336,8 @@ void bnx2x_init_rx_rings(struct bnx2x *bp)
for (i = 0, ring_prod = 0;
i < MAX_RX_SGE_CNT*NUM_RX_SGE_PAGES; i++) {
- if (bnx2x_alloc_rx_sge(bp, fp, ring_prod) < 0) {
+ if (bnx2x_alloc_rx_sge(bp, fp, ring_prod,
+ GFP_KERNEL) < 0) {
BNX2X_ERR("was only able to allocate %d rx sges\n",
i);
BNX2X_ERR("disabling TPA for queue[%d]\n",
@@ -4214,7 +4222,7 @@ static int bnx2x_alloc_rx_bds(struct bnx2x_fastpath *fp,
* fp->eth_q_stats.rx_skb_alloc_failed = 0
*/
for (i = 0; i < rx_ring_size; i++) {
- if (bnx2x_alloc_rx_data(bp, fp, ring_prod) < 0) {
+ if (bnx2x_alloc_rx_data(bp, fp, ring_prod, GFP_KERNEL) < 0) {
failure_cnt++;
continue;
}
--
1.8.3.1
--
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