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net: thunderx: Set recevie buffer page usage count in bulk 

Instead of calling get_page() for every receive buffer carved out
of page, set page's usage count at the end, to reduce no of atomic
calls.

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sunil Goutham 2016-03-14 16:36:14 +05:30 committed by David S. Miller
parent 9bd160bfa2
commit 5c2e26f6f6
2 changed files with 24 additions and 8 deletions
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1
drivers/net/ethernet/cavium/thunder/nic.h
View File

@ -294,6 +294,7 @@ struct nicvf {
u32 speed;
struct page *rb_page;
u32 rb_page_offset;
u16 rb_pageref;
bool rb_alloc_fail;
bool rb_work_scheduled;
struct delayed_work rbdr_work;

31
drivers/net/ethernet/cavium/thunder/nicvf_queues.c
View File

@ -18,6 +18,15 @@
#include "q_struct.h"
#include "nicvf_queues.h"
static void nicvf_get_page(struct nicvf *nic)
{
if (!nic->rb_pageref || !nic->rb_page)
return;
atomic_add(nic->rb_pageref, &nic->rb_page->_count);
nic->rb_pageref = 0;
}
/* Poll a register for a specific value */
static int nicvf_poll_reg(struct nicvf *nic, int qidx,
u64 reg, int bit_pos, int bits, int val)
@ -81,16 +90,15 @@ static inline int nicvf_alloc_rcv_buffer(struct nicvf *nic, gfp_t gfp,
int order = (PAGE_SIZE <= 4096) ? PAGE_ALLOC_COSTLY_ORDER : 0;
/* Check if request can be accomodated in previous allocated page */
if (nic->rb_page) {
if ((nic->rb_page_offset + buf_len + buf_len) >
(PAGE_SIZE << order)) {
nic->rb_page = NULL;
} else {
nic->rb_page_offset += buf_len;
get_page(nic->rb_page);
}
if (nic->rb_page &&
((nic->rb_page_offset + buf_len) < (PAGE_SIZE << order))) {
nic->rb_pageref++;
goto ret;
}
nicvf_get_page(nic);
nic->rb_page = NULL;
/* Allocate a new page */
if (!nic->rb_page) {
nic->rb_page = alloc_pages(gfp | __GFP_COMP | __GFP_NOWARN,
@ -102,7 +110,9 @@ static inline int nicvf_alloc_rcv_buffer(struct nicvf *nic, gfp_t gfp,
nic->rb_page_offset = 0;
}
ret:
*rbuf = (u64 *)((u64)page_address(nic->rb_page) + nic->rb_page_offset);
nic->rb_page_offset += buf_len;
return 0;
}
@ -158,6 +168,9 @@ static int nicvf_init_rbdr(struct nicvf *nic, struct rbdr *rbdr,
desc = GET_RBDR_DESC(rbdr, idx);
desc->buf_addr = virt_to_phys(rbuf) >> NICVF_RCV_BUF_ALIGN;
}
nicvf_get_page(nic);
return 0;
}
@ -241,6 +254,8 @@ refill:
new_rb++;
}
nicvf_get_page(nic);
/* make sure all memory stores are done before ringing doorbell */
smp_wmb();