Hi Christophe,
Thanks for the patch.
Just a question, As per [1], former can be allocated from interrupt context.
But nothing mentioned for the allocation using the patch you mentioned[2]. I agree GFP_KERNEL
gives more opportunities of successful allocation.
Q1) Here it allocates 8K instead of 1K on each loop, Is there any limitation for netdev_alloc_skb for allocating 8K size?
Q2) In terms of allocation performance which is better netdev_alloc_skb or __netdev_alloc_skb?
[1] https://www.kernel.org/doc/htmldocs/networking/API-netdev-alloc-skb.html
[2] https://www.kernel.org/doc/htmldocs/networking/API---netdev-alloc-skb.html
Regards,
Biju
Subject: [PATCH] ravb: Use GFP_KERNEL instead of GFP_ATOMIC when possible
'max_rx_len' can be up to GBETH_RX_BUFF_MAX (i.e. 8192) (see
'gbeth_hw_info').
The default value of 'num_rx_ring' can be BE_RX_RING_SIZE (i.e. 1024).
So this loop can allocate 8 Mo of memory.
Previous memory allocations in this function already use GFP_KERNEL, so
use __netdev_alloc_skb() and an explicit GFP_KERNEL instead of a implicit
GFP_ATOMIC.
This gives more opportunities of successful allocation.
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
drivers/net/ethernet/renesas/ravb_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/renesas/ravb_main.c
b/drivers/net/ethernet/renesas/ravb_main.c
index 24e2635c4c80..525d66f71f02 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -475,7 +475,7 @@ static int ravb_ring_init(struct net_device *ndev, int
q)
goto error;
for (i = 0; i < priv->num_rx_ring[q]; i++) {
- skb = netdev_alloc_skb(ndev, info->max_rx_len);
+ skb = __netdev_alloc_skb(ndev, info->max_rx_len, GFP_KERNEL);
if (!skb)
goto error;
ravb_set_buffer_align(skb);
--
2.32.0