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Date: Sat, 6 Jul 2019 03:36:18 -0400
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net, gospo@...adcom.com
Cc: netdev@...r.kernel.org, hawk@...nel.org, ast@...nel.org
Subject: [PATCH net-next 4/4] bnxt_en: add page_pool support
From: Andy Gospodarek <gospo@...adcom.com>
This removes contention over page allocation for XDP_REDIRECT actions by
adding page_pool support per queue for the driver. The performance for
XDP_REDIRECT actions scales linearly with the number of cores performing
redirect actions when using the page pools instead of the standard page
allocator.
Signed-off-by: Andy Gospodarek <gospo@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
drivers/net/ethernet/broadcom/Kconfig | 1 +
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 40 +++++++++++++++++++++++----
drivers/net/ethernet/broadcom/bnxt/bnxt.h | 3 ++
drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c | 3 +-
4 files changed, 41 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/Kconfig b/drivers/net/ethernet/broadcom/Kconfig
index 2e4a8c7..e9017ca 100644
--- a/drivers/net/ethernet/broadcom/Kconfig
+++ b/drivers/net/ethernet/broadcom/Kconfig
@@ -199,6 +199,7 @@ config BNXT
select FW_LOADER
select LIBCRC32C
select NET_DEVLINK
+ select PAGE_POOL
---help---
This driver supports Broadcom NetXtreme-C/E 10/25/40/50 gigabit
Ethernet cards. To compile this driver as a module, choose M here:
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index d8f0846..b6777e5 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -54,6 +54,7 @@
#include <net/pkt_cls.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
+#include <net/page_pool.h>
#include "bnxt_hsi.h"
#include "bnxt.h"
@@ -668,19 +669,20 @@ static void bnxt_tx_int(struct bnxt *bp, struct bnxt_napi *bnapi, int nr_pkts)
}
static struct page *__bnxt_alloc_rx_page(struct bnxt *bp, dma_addr_t *mapping,
+ struct bnxt_rx_ring_info *rxr,
gfp_t gfp)
{
struct device *dev = &bp->pdev->dev;
struct page *page;
- page = alloc_page(gfp);
+ page = page_pool_dev_alloc_pages(rxr->page_pool);
if (!page)
return NULL;
*mapping = dma_map_page_attrs(dev, page, 0, PAGE_SIZE, bp->rx_dir,
DMA_ATTR_WEAK_ORDERING);
if (dma_mapping_error(dev, *mapping)) {
- __free_page(page);
+ page_pool_recycle_direct(rxr->page_pool, page);
return NULL;
}
*mapping += bp->rx_dma_offset;
@@ -716,7 +718,8 @@ int bnxt_alloc_rx_data(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
dma_addr_t mapping;
if (BNXT_RX_PAGE_MODE(bp)) {
- struct page *page = __bnxt_alloc_rx_page(bp, &mapping, gfp);
+ struct page *page =
+ __bnxt_alloc_rx_page(bp, &mapping, rxr, gfp);
if (!page)
return -ENOMEM;
@@ -2360,7 +2363,7 @@ static void bnxt_free_rx_skbs(struct bnxt *bp)
dma_unmap_page_attrs(&pdev->dev, mapping,
PAGE_SIZE, bp->rx_dir,
DMA_ATTR_WEAK_ORDERING);
- __free_page(data);
+ page_pool_recycle_direct(rxr->page_pool, data);
} else {
dma_unmap_single_attrs(&pdev->dev, mapping,
bp->rx_buf_use_size,
@@ -2497,6 +2500,8 @@ static void bnxt_free_rx_rings(struct bnxt *bp)
if (xdp_rxq_info_is_reg(&rxr->xdp_rxq))
xdp_rxq_info_unreg(&rxr->xdp_rxq);
+ rxr->page_pool = NULL;
+
kfree(rxr->rx_tpa);
rxr->rx_tpa = NULL;
@@ -2511,6 +2516,26 @@ static void bnxt_free_rx_rings(struct bnxt *bp)
}
}
+static int bnxt_alloc_rx_page_pool(struct bnxt *bp,
+ struct bnxt_rx_ring_info *rxr)
+{
+ struct page_pool_params pp = { 0 };
+
+ pp.pool_size = bp->rx_ring_size;
+ pp.nid = dev_to_node(&bp->pdev->dev);
+ pp.dev = &bp->pdev->dev;
+ pp.dma_dir = DMA_BIDIRECTIONAL;
+
+ rxr->page_pool = page_pool_create(&pp);
+ if (IS_ERR(rxr->page_pool)) {
+ int err = PTR_ERR(rxr->page_pool);
+
+ rxr->page_pool = NULL;
+ return err;
+ }
+ return 0;
+}
+
static int bnxt_alloc_rx_rings(struct bnxt *bp)
{
int i, rc, agg_rings = 0, tpa_rings = 0;
@@ -2530,12 +2555,17 @@ static int bnxt_alloc_rx_rings(struct bnxt *bp)
ring = &rxr->rx_ring_struct;
+ rc = bnxt_alloc_rx_page_pool(bp, rxr);
+ if (rc)
+ return rc;
+
rc = xdp_rxq_info_reg(&rxr->xdp_rxq, bp->dev, i);
if (rc < 0)
return rc;
rc = xdp_rxq_info_reg_mem_model(&rxr->xdp_rxq,
- MEM_TYPE_PAGE_SHARED, NULL);
+ MEM_TYPE_PAGE_POOL,
+ rxr->page_pool);
if (rc) {
xdp_rxq_info_unreg(&rxr->xdp_rxq);
return rc;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 8ac51fa..16694b7 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -26,6 +26,8 @@
#include <net/xdp.h>
#include <linux/dim.h>
+struct page_pool;
+
struct tx_bd {
__le32 tx_bd_len_flags_type;
#define TX_BD_TYPE (0x3f << 0)
@@ -799,6 +801,7 @@ struct bnxt_rx_ring_info {
struct bnxt_ring_struct rx_ring_struct;
struct bnxt_ring_struct rx_agg_ring_struct;
struct xdp_rxq_info xdp_rxq;
+ struct page_pool *page_pool;
};
struct bnxt_cp_ring_info {
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
index 12489d2..c6f6f20 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_xdp.c
@@ -15,6 +15,7 @@
#include <linux/bpf.h>
#include <linux/bpf_trace.h>
#include <linux/filter.h>
+#include <net/page_pool.h>
#include "bnxt_hsi.h"
#include "bnxt.h"
#include "bnxt_xdp.h"
@@ -191,7 +192,7 @@ bool bnxt_rx_xdp(struct bnxt *bp, struct bnxt_rx_ring_info *rxr, u16 cons,
if (xdp_do_redirect(bp->dev, &xdp, xdp_prog)) {
trace_xdp_exception(bp->dev, xdp_prog, act);
- __free_page(page);
+ page_pool_recycle_direct(rxr->page_pool, page);
return true;
}
--
2.5.1
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