xdp: introduce bulking for page_pool tx return path

---
 include/net/xdp.h | 17 +++++++++++++-
 net/core/xdp.c    | 59 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 1 deletion(-)

include/net/xdp.h +16 -1

index 3814fb631d52..7d48b2ae217a 100644
@@ -104,6 +104,18 @@ struct xdp_frame {
 	struct net_device *dev_rx; /* used by cpumap */
 };
 
+#define XDP_BULK_QUEUE_SIZE	16
+struct xdp_frame_bulk {
+	int count;
+	void *xa;
+	void *q[XDP_BULK_QUEUE_SIZE];
+};
+
+static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq)
+{
+	/* bq->count will be zero'ed when bq->xa gets updated */
+	bq->xa = NULL;
+}
 
 static inline struct skb_shared_info *
 xdp_get_shared_info_from_frame(struct xdp_frame *frame)

@@ -194,6 +206,9 @@ struct xdp_frame *xdp_convert_buff_to_frame(struct xdp_buff *xdp)
 void xdp_return_frame(struct xdp_frame *xdpf);
 void xdp_return_frame_rx_napi(struct xdp_frame *xdpf);
 void xdp_return_buff(struct xdp_buff *xdp);
+void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq);
+void xdp_return_frame_bulk(struct xdp_frame *xdpf,
+			   struct xdp_frame_bulk *bq);
 
 /* When sending xdp_frame into the network stack, then there is no
  * return point callback, which is needed to release e.g. DMA-mapping

@@ -245,6 +260,6 @@ bool xdp_attachment_flags_ok(struct xdp_attachment_info *info,
 void xdp_attachment_setup(struct xdp_attachment_info *info,
 			  struct netdev_bpf *bpf);
 
-#define DEV_MAP_BULK_SIZE 16
+#define DEV_MAP_BULK_SIZE XDP_BULK_QUEUE_SIZE
 
 #endif /* __LINUX_NET_XDP_H__ */

net/core/xdp.c +59 -0

65 lines not on this page · raw message

Signature · 1 line

2.26.2

John Fastabend

maintainer Acked-by on v6 1/5

2020-11-13 20:03 UTC #2 lore raw

RE: [PATCH v6 net-nex 1/5] net: xdp: introduce bulking for xdp tx return path

Quoted 12 lines · Lorenzo Bianconi

XDP bulk APIs introduce a defer/flush mechanism to return pages belonging to the same xdp_mem_allocator object (identified via the mem.id field) in bulk to optimize I-cache and D-cache since xdp_return_frame is usually run inside the driver NAPI tx completion loop.
The bulk queue size is set to 16 to be aligned to how XDP_REDIRECT bulking works. The bulk is flushed when it is full or when mem.id changes.
xdp_frame_bulk is usually stored/allocated on the function call-stack to avoid locking penalties.
Current implementation considers only page_pool memory model.

Quoted 9 lines

Suggested-by Jesper Dangaard Brouer <[email protected]>
Co-developed-by Jesper Dangaard Brouer <[email protected]>
Signed-off-by Jesper Dangaard Brouer <[email protected]>
Signed-off-by Lorenzo Bianconi <[email protected]>
---
 include/net/xdp.h | 17 +++++++++++++-
 net/core/xdp.c    | 59 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 1 deletion(-)

Ilias Apalodimas

maintainer Acked-by on v6 1/5

2020-11-13 20:58 UTC #3 lore raw

Re: [PATCH v6 net-nex 1/5] net: xdp: introduce bulking for xdp tx return path

Quoted 135 lines · Lorenzo Bianconi

Co-developed-by Jesper Dangaard Brouer <[email protected]>

Signed-off-by Jesper Dangaard Brouer <[email protected]>

---
 include/net/xdp.h | 17 +++++++++++++-
 net/core/xdp.c    | 59 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 1 deletion(-)

include/net/xdp.h +16 -1

index 3814fb631d52..7d48b2ae217a 100644
@@ -104,6 +104,18 @@ struct xdp_frame {
 	struct net_device *dev_rx; /* used by cpumap */
 };
 
+#define XDP_BULK_QUEUE_SIZE	16
+struct xdp_frame_bulk {
+	int count;
+	void *xa;
+	void *q[XDP_BULK_QUEUE_SIZE];
+};
+
+static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq)
+{
+	/* bq->count will be zero'ed when bq->xa gets updated */
+	bq->xa = NULL;
+}
 
 static inline struct skb_shared_info *
 xdp_get_shared_info_from_frame(struct xdp_frame *frame)

@@ -194,6 +206,9 @@ struct xdp_frame *xdp_convert_buff_to_frame(struct xdp_buff *xdp)
 void xdp_return_frame(struct xdp_frame *xdpf);
 void xdp_return_frame_rx_napi(struct xdp_frame *xdpf);
 void xdp_return_buff(struct xdp_buff *xdp);
+void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq);
+void xdp_return_frame_bulk(struct xdp_frame *xdpf,
+			   struct xdp_frame_bulk *bq);
 
 /* When sending xdp_frame into the network stack, then there is no
  * return point callback, which is needed to release e.g. DMA-mapping

@@ -245,6 +260,6 @@ bool xdp_attachment_flags_ok(struct xdp_attachment_info *info,
 void xdp_attachment_setup(struct xdp_attachment_info *info,
 			  struct netdev_bpf *bpf);
 
-#define DEV_MAP_BULK_SIZE 16
+#define DEV_MAP_BULK_SIZE XDP_BULK_QUEUE_SIZE
 
 #endif /* __LINUX_NET_XDP_H__ */

net/core/xdp.c +59 -0

index 48aba933a5a8..bbaee7fdd44f 100644
@@ -380,6 +380,65 @@ void xdp_return_frame_rx_napi(struct xdp_frame *xdpf)
 }
 EXPORT_SYMBOL_GPL(xdp_return_frame_rx_napi);
 
+/* XDP bulk APIs introduce a defer/flush mechanism to return
+ * pages belonging to the same xdp_mem_allocator object
+ * (identified via the mem.id field) in bulk to optimize
+ * I-cache and D-cache.
+ * The bulk queue size is set to 16 to be aligned to how
+ * XDP_REDIRECT bulking works. The bulk is flushed when
+ * it is full or when mem.id changes.
+ * xdp_frame_bulk is usually stored/allocated on the function
+ * call-stack to avoid locking penalties.
+ */
+void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq)
+{
+	struct xdp_mem_allocator *xa = bq->xa;
+	int i;
+
+	if (unlikely(!xa))
+		return;
+
+	for (i = 0; i < bq->count; i++) {
+		struct page *page = virt_to_head_page(bq->q[i]);
+
+		page_pool_put_full_page(xa->page_pool, page, false);
+	}
+	/* bq->xa is not cleared to save lookup, if mem.id same in next bulk */
+	bq->count = 0;
+}
+EXPORT_SYMBOL_GPL(xdp_flush_frame_bulk);
+
+/* Must be called with rcu_read_lock held */
+void xdp_return_frame_bulk(struct xdp_frame *xdpf,
+			   struct xdp_frame_bulk *bq)
+{
+	struct xdp_mem_info *mem = &xdpf->mem;
+	struct xdp_mem_allocator *xa;
+
+	if (mem->type != MEM_TYPE_PAGE_POOL) {
+		__xdp_return(xdpf->data, &xdpf->mem, false);
+		return;
+	}
+
+	xa = bq->xa;
+	if (unlikely(!xa)) {
+		xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
+		bq->count = 0;
+		bq->xa = xa;
+	}
+
+	if (bq->count == XDP_BULK_QUEUE_SIZE)
+		xdp_flush_frame_bulk(bq);
+
+	if (unlikely(mem->id != xa->mem.id)) {
+		xdp_flush_frame_bulk(bq);
+		bq->xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
+	}
+
+	bq->q[bq->count++] = xdpf->data;
+}
+EXPORT_SYMBOL_GPL(xdp_return_frame_bulk);
+
 void xdp_return_buff(struct xdp_buff *xdp)
 {
 	__xdp_return(xdp->data, &xdp->rxq->mem, true);

Signature · 1 line

2.26.2

Could you add the changes in the Documentation as well (which can do in later)

Acked-by Ilias Apalodimas <[email protected]>

Lorenzo Bianconi

author

2020-11-13 11:59 UTC #4 lore raw

PATCH v6 2/5 net: page_pool: add bulk support for ptr_ring

Introduce the capability to batch page_pool ptr_ring refill since it is usually run inside the driver NAPI tx completion loop.

Co-developed-by Jesper Dangaard Brouer <[email protected]>

Signed-off-by Jesper Dangaard Brouer <[email protected]>

---
 include/net/page_pool.h | 26 +++++++++++++++
 net/core/page_pool.c    | 70 +++++++++++++++++++++++++++++++++++------
 net/core/xdp.c          |  9 ++----
 3 files changed, 88 insertions(+), 17 deletions(-)

include/net/page_pool.h +26 -0

index 81d7773f96cd..b5b195305346 100644
@@ -152,6 +152,8 @@ struct page_pool *page_pool_create(const struct page_pool_params *params);
 void page_pool_destroy(struct page_pool *pool);
 void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *));
 void page_pool_release_page(struct page_pool *pool, struct page *page);
+void page_pool_put_page_bulk(struct page_pool *pool, void **data,
+			     int count);
 #else
 static inline void page_pool_destroy(struct page_pool *pool)
 {

@@ -165,6 +167,11 @@ static inline void page_pool_release_page(struct page_pool *pool,
 					  struct page *page)
 {
 }
+
+static inline void page_pool_put_page_bulk(struct page_pool *pool, void **data,
+					   int count)
+{
+}
 #endif
 
 void page_pool_put_page(struct page_pool *pool, struct page *page,

@@ -215,4 +222,23 @@ static inline void page_pool_nid_changed(struct page_pool *pool, int new_nid)
 	if (unlikely(pool->p.nid != new_nid))
 		page_pool_update_nid(pool, new_nid);
 }
+
+static inline void page_pool_ring_lock(struct page_pool *pool)
+	__acquires(&pool->ring.producer_lock)
+{
+	if (in_serving_softirq())
+		spin_lock(&pool->ring.producer_lock);
+	else
+		spin_lock_bh(&pool->ring.producer_lock);
+}
+
+static inline void page_pool_ring_unlock(struct page_pool *pool)
+	__releases(&pool->ring.producer_lock)
+{
+	if (in_serving_softirq())
+		spin_unlock(&pool->ring.producer_lock);
+	else
+		spin_unlock_bh(&pool->ring.producer_lock);
+}
+
 #endif /* _NET_PAGE_POOL_H */

net/core/page_pool.c +60 ~~-10~~

98 lines not on this page · raw message

net/core/xdp.c +2 -7

index bbaee7fdd44f..3d330ebda893 100644
@@ -393,16 +393,11 @@ EXPORT_SYMBOL_GPL(xdp_return_frame_rx_napi);
 void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq)
 {
 	struct xdp_mem_allocator *xa = bq->xa;
-	int i;
 
-	if (unlikely(!xa))
+	if (unlikely(!xa || !bq->count))
 		return;
 
-	for (i = 0; i < bq->count; i++) {
-		struct page *page = virt_to_head_page(bq->q[i]);
-
-		page_pool_put_full_page(xa->page_pool, page, false);
-	}
+	page_pool_put_page_bulk(xa->page_pool, bq->q, bq->count);
 	/* bq->xa is not cleared to save lookup, if mem.id same in next bulk */
 	bq->count = 0;
 }

Signature · 1 line

2.26.2

John Fastabend

maintainer Acked-by on v6 2/5

2020-11-13 20:06 UTC #5 lore raw

RE: [PATCH v6 net-nex 2/5] net: page_pool: add bulk support for ptr_ring

include/net/page_pool.h

Quoted 15 lines · Lorenzo Bianconi

Introduce the capability to batch page_pool ptr_ring refill since it is usually run inside the driver NAPI tx completion loop.
Suggested-by Jesper Dangaard Brouer <[email protected]>
Co-developed-by Jesper Dangaard Brouer <[email protected]>
Signed-off-by Jesper Dangaard Brouer <[email protected]>
Signed-off-by Lorenzo Bianconi <[email protected]>
---
 include/net/page_pool.h | 26 +++++++++++++++
 net/core/page_pool.c    | 70 +++++++++++++++++++++++++++++++++++------
 net/core/xdp.c          |  9 ++----
 3 files changed, 88 insertions(+), 17 deletions(-)
include/net/page_pool.h +0 -0
index 81d7773f96cd..b5b195305346 100644

Ilias Apalodimas

maintainer Acked-by on v6 2/5

2020-11-13 20:59 UTC #6 lore raw

Re: [PATCH v6 net-nex 2/5] net: page_pool: add bulk support for ptr_ring

Quoted 194 lines · Lorenzo Bianconi

Introduce the capability to batch page_pool ptr_ring refill since it is usually run inside the driver NAPI tx completion loop.

Co-developed-by Jesper Dangaard Brouer <[email protected]>

Signed-off-by Jesper Dangaard Brouer <[email protected]>

---
 include/net/page_pool.h | 26 +++++++++++++++
 net/core/page_pool.c    | 70 +++++++++++++++++++++++++++++++++++------
 net/core/xdp.c          |  9 ++----
 3 files changed, 88 insertions(+), 17 deletions(-)

include/net/page_pool.h +26 -0

index 81d7773f96cd..b5b195305346 100644
@@ -152,6 +152,8 @@ struct page_pool *page_pool_create(const struct page_pool_params *params);
 void page_pool_destroy(struct page_pool *pool);
 void page_pool_use_xdp_mem(struct page_pool *pool, void (*disconnect)(void *));
 void page_pool_release_page(struct page_pool *pool, struct page *page);
+void page_pool_put_page_bulk(struct page_pool *pool, void **data,
+			     int count);
 #else
 static inline void page_pool_destroy(struct page_pool *pool)
 {

@@ -165,6 +167,11 @@ static inline void page_pool_release_page(struct page_pool *pool,
 					  struct page *page)
 {
 }
+
+static inline void page_pool_put_page_bulk(struct page_pool *pool, void **data,
+					   int count)
+{
+}
 #endif
 
 void page_pool_put_page(struct page_pool *pool, struct page *page,

@@ -215,4 +222,23 @@ static inline void page_pool_nid_changed(struct page_pool *pool, int new_nid)
 	if (unlikely(pool->p.nid != new_nid))
 		page_pool_update_nid(pool, new_nid);
 }
+
+static inline void page_pool_ring_lock(struct page_pool *pool)
+	__acquires(&pool->ring.producer_lock)
+{
+	if (in_serving_softirq())
+		spin_lock(&pool->ring.producer_lock);
+	else
+		spin_lock_bh(&pool->ring.producer_lock);
+}
+
+static inline void page_pool_ring_unlock(struct page_pool *pool)
+	__releases(&pool->ring.producer_lock)
+{
+	if (in_serving_softirq())
+		spin_unlock(&pool->ring.producer_lock);
+	else
+		spin_unlock_bh(&pool->ring.producer_lock);
+}
+
 #endif /* _NET_PAGE_POOL_H */

net/core/page_pool.c +60 ~~-10~~

index ef98372facf6..f3c690b8c8e3 100644
@@ -11,6 +11,8 @@
 #include <linux/device.h>
 
 #include <net/page_pool.h>
+#include <net/xdp.h>
+
 #include <linux/dma-direction.h>
 #include <linux/dma-mapping.h>
 #include <linux/page-flags.h>

@@ -362,8 +364,9 @@ static bool pool_page_reusable(struct page_pool *pool, struct page *page)
  * If the page refcnt != 1, then the page will be returned to memory
  * subsystem.
  */
-void page_pool_put_page(struct page_pool *pool, struct page *page,
-			unsigned int dma_sync_size, bool allow_direct)
+static __always_inline struct page *
+__page_pool_put_page(struct page_pool *pool, struct page *page,
+		     unsigned int dma_sync_size, bool allow_direct)
 {
 	/* This allocator is optimized for the XDP mode that uses
 	 * one-frame-per-page, but have fallbacks that act like the

@@ -379,15 +382,12 @@ void page_pool_put_page(struct page_pool *pool, struct page *page,
 			page_pool_dma_sync_for_device(pool, page,
 						      dma_sync_size);
 
-		if (allow_direct && in_serving_softirq())
-			if (page_pool_recycle_in_cache(page, pool))
-				return;
+		if (allow_direct && in_serving_softirq() &&
+		    page_pool_recycle_in_cache(page, pool))
+			return NULL;
 
-		if (!page_pool_recycle_in_ring(pool, page)) {
-			/* Cache full, fallback to free pages */
-			page_pool_return_page(pool, page);
-		}
-		return;
+		/* Page found as candidate for recycling */
+		return page;
 	}
 	/* Fallback/non-XDP mode: API user have elevated refcnt.
 	 *

@@ -405,9 +405,59 @@ void page_pool_put_page(struct page_pool *pool, struct page *page,
 	/* Do not replace this with page_pool_return_page() */
 	page_pool_release_page(pool, page);
 	put_page(page);
+
+	return NULL;
+}
+
+void page_pool_put_page(struct page_pool *pool, struct page *page,
+			unsigned int dma_sync_size, bool allow_direct)
+{
+	page = __page_pool_put_page(pool, page, dma_sync_size, allow_direct);
+	if (page && !page_pool_recycle_in_ring(pool, page)) {
+		/* Cache full, fallback to free pages */
+		page_pool_return_page(pool, page);
+	}
 }
 EXPORT_SYMBOL(page_pool_put_page);
 
+/* Caller must not use data area after call, as this function overwrites it */
+void page_pool_put_page_bulk(struct page_pool *pool, void **data,
+			     int count)
+{
+	int i, bulk_len = 0;
+
+	for (i = 0; i < count; i++) {
+		struct page *page = virt_to_head_page(data[i]);
+
+		page = __page_pool_put_page(pool, page, -1, false);
+		/* Approved for bulk recycling in ptr_ring cache */
+		if (page)
+			data[bulk_len++] = page;
+	}
+
+	if (unlikely(!bulk_len))
+		return;
+
+	/* Bulk producer into ptr_ring page_pool cache */
+	page_pool_ring_lock(pool);
+	for (i = 0; i < bulk_len; i++) {
+		if (__ptr_ring_produce(&pool->ring, data[i]))
+			break; /* ring full */
+	}
+	page_pool_ring_unlock(pool);
+
+	/* Hopefully all pages was return into ptr_ring */
+	if (likely(i == bulk_len))
+		return;
+
+	/* ptr_ring cache full, free remaining pages outside producer lock
+	 * since put_page() with refcnt == 1 can be an expensive operation
+	 */
+	for (; i < bulk_len; i++)
+		page_pool_return_page(pool, data[i]);
+}
+EXPORT_SYMBOL(page_pool_put_page_bulk);
+
 static void page_pool_empty_ring(struct page_pool *pool)
 {
 	struct page *page;

net/core/xdp.c +2 -7

index bbaee7fdd44f..3d330ebda893 100644
@@ -393,16 +393,11 @@ EXPORT_SYMBOL_GPL(xdp_return_frame_rx_napi);
 void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq)
 {
 	struct xdp_mem_allocator *xa = bq->xa;
-	int i;
 
-	if (unlikely(!xa))
+	if (unlikely(!xa || !bq->count))
 		return;
 
-	for (i = 0; i < bq->count; i++) {
-		struct page *page = virt_to_head_page(bq->q[i]);
-
-		page_pool_put_full_page(xa->page_pool, page, false);
-	}
+	page_pool_put_page_bulk(xa->page_pool, bq->q, bq->count);
 	/* bq->xa is not cleared to save lookup, if mem.id same in next bulk */
 	bq->count = 0;
 }

Signature · 1 line

2.26.2

Acked-by Ilias Apalodimas <[email protected]>

Lorenzo Bianconi

author

2020-11-13 12:03 UTC #7 lore raw

PATCH v6 3/5 net: mvneta: add xdp tx return bulking support

Convert mvneta driver to xdp_return_frame_bulk APIs.

XDP_REDIRECT (upstream codepath): 275Kpps XDP_REDIRECT (upstream codepath + bulking APIs): 284Kpps

Co-developed-by Jesper Dangaard Brouer <[email protected]>

Signed-off-by Jesper Dangaard Brouer <[email protected]>

---
 drivers/net/ethernet/marvell/mvneta.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

drivers/net/ethernet/marvell/mvneta.c +9 -1

index 54b0bf574c05..183530ed4d1d 100644
@@ -1834,8 +1834,13 @@ static void mvneta_txq_bufs_free(struct mvneta_port *pp,
 				 struct netdev_queue *nq, bool napi)
 {
 	unsigned int bytes_compl = 0, pkts_compl = 0;
+	struct xdp_frame_bulk bq;
 	int i;
 
+	xdp_frame_bulk_init(&bq);
+
+	rcu_read_lock(); /* need for xdp_return_frame_bulk */
+
 	for (i = 0; i < num; i++) {
 		struct mvneta_tx_buf *buf = &txq->buf[txq->txq_get_index];
 		struct mvneta_tx_desc *tx_desc = txq->descs +

@@ -1857,9 +1862,12 @@ static void mvneta_txq_bufs_free(struct mvneta_port *pp,
 			if (napi && buf->type == MVNETA_TYPE_XDP_TX)
 				xdp_return_frame_rx_napi(buf->xdpf);
 			else
-				xdp_return_frame(buf->xdpf);
+				xdp_return_frame_bulk(buf->xdpf, &bq);
 		}
 	}
+	xdp_flush_frame_bulk(&bq);
+
+	rcu_read_unlock();
 
 	netdev_tx_completed_queue(nq, pkts_compl, bytes_compl);
 }

Signature · 1 line

2.26.2

John Fastabend

maintainer Acked-by on v6 3/5

2020-11-13 20:06 UTC #8 lore raw

RE: [PATCH v6 net-nex 3/5] net: mvneta: add xdp tx return bulking support

Quoted 47 lines · Lorenzo Bianconi

Convert mvneta driver to xdp_return_frame_bulk APIs.

XDP_REDIRECT (upstream codepath): 275Kpps XDP_REDIRECT (upstream codepath + bulking APIs): 284Kpps

Co-developed-by Jesper Dangaard Brouer <[email protected]>

Signed-off-by Jesper Dangaard Brouer <[email protected]>

---
 drivers/net/ethernet/marvell/mvneta.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

drivers/net/ethernet/marvell/mvneta.c +9 -1

index 54b0bf574c05..183530ed4d1d 100644
@@ -1834,8 +1834,13 @@ static void mvneta_txq_bufs_free(struct mvneta_port *pp,
 				 struct netdev_queue *nq, bool napi)
 {
 	unsigned int bytes_compl = 0, pkts_compl = 0;
+	struct xdp_frame_bulk bq;
 	int i;
 
+	xdp_frame_bulk_init(&bq);
+
+	rcu_read_lock(); /* need for xdp_return_frame_bulk */
+
 	for (i = 0; i < num; i++) {
 		struct mvneta_tx_buf *buf = &txq->buf[txq->txq_get_index];
 		struct mvneta_tx_desc *tx_desc = txq->descs +

@@ -1857,9 +1862,12 @@ static void mvneta_txq_bufs_free(struct mvneta_port *pp,
 			if (napi && buf->type == MVNETA_TYPE_XDP_TX)
 				xdp_return_frame_rx_napi(buf->xdpf);
 			else
-				xdp_return_frame(buf->xdpf);
+				xdp_return_frame_bulk(buf->xdpf, &bq);
 		}
 	}
+	xdp_flush_frame_bulk(&bq);
+
+	rcu_read_unlock();
 
 	netdev_tx_completed_queue(nq, pkts_compl, bytes_compl);
 }

Signature · 1 line

2.26.2

Lorenzo Bianconi

author

2020-11-13 12:03 UTC #9 lore raw

PATCH v6 4/5 net: mvpp2: add xdp tx return bulking support

Convert mvpp2 driver to xdp_return_frame_bulk APIs.

XDP_REDIRECT (upstream codepath): 1.79Mpps XDP_REDIRECT (upstream codepath + bulking APIs): 1.93Mpps

Tested-by Matteo Croce <[email protected]>

Co-developed-by Jesper Dangaard Brouer <[email protected]>

Signed-off-by Jesper Dangaard Brouer <[email protected]>

---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c +9 -1

index f6616c8933ca..3069e192d773 100644
@@ -2440,8 +2440,13 @@ static void mvpp2_txq_bufs_free(struct mvpp2_port *port,
 				struct mvpp2_tx_queue *txq,
 				struct mvpp2_txq_pcpu *txq_pcpu, int num)
 {
+	struct xdp_frame_bulk bq;
 	int i;
 
+	xdp_frame_bulk_init(&bq);
+
+	rcu_read_lock(); /* need for xdp_return_frame_bulk */
+
 	for (i = 0; i < num; i++) {
 		struct mvpp2_txq_pcpu_buf *tx_buf =
 			txq_pcpu->buffs + txq_pcpu->txq_get_index;

@@ -2454,10 +2459,13 @@ static void mvpp2_txq_bufs_free(struct mvpp2_port *port,
 			dev_kfree_skb_any(tx_buf->skb);
 		else if (tx_buf->type == MVPP2_TYPE_XDP_TX ||
 			 tx_buf->type == MVPP2_TYPE_XDP_NDO)
-			xdp_return_frame(tx_buf->xdpf);
+			xdp_return_frame_bulk(tx_buf->xdpf, &bq);
 
 		mvpp2_txq_inc_get(txq_pcpu);
 	}
+	xdp_flush_frame_bulk(&bq);
+
+	rcu_read_unlock();
 }
 
 static inline struct mvpp2_rx_queue *mvpp2_get_rx_queue(struct mvpp2_port *port,

Signature · 1 line

2.26.2

John Fastabend

maintainer Acked-by on v6 4/5

2020-11-13 20:09 UTC #10 lore raw

RE: [PATCH v6 net-nex 4/5] net: mvpp2: add xdp tx return bulking support

Quoted 49 lines · Lorenzo Bianconi

Convert mvpp2 driver to xdp_return_frame_bulk APIs.

XDP_REDIRECT (upstream codepath): 1.79Mpps XDP_REDIRECT (upstream codepath + bulking APIs): 1.93Mpps

Tested-by Matteo Croce <[email protected]>

Co-developed-by Jesper Dangaard Brouer <[email protected]>

Signed-off-by Jesper Dangaard Brouer <[email protected]>

---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c +9 -1

index f6616c8933ca..3069e192d773 100644
@@ -2440,8 +2440,13 @@ static void mvpp2_txq_bufs_free(struct mvpp2_port *port,
 				struct mvpp2_tx_queue *txq,
 				struct mvpp2_txq_pcpu *txq_pcpu, int num)
 {
+	struct xdp_frame_bulk bq;
 	int i;
 
+	xdp_frame_bulk_init(&bq);
+
+	rcu_read_lock(); /* need for xdp_return_frame_bulk */
+
 	for (i = 0; i < num; i++) {
 		struct mvpp2_txq_pcpu_buf *tx_buf =
 			txq_pcpu->buffs + txq_pcpu->txq_get_index;

@@ -2454,10 +2459,13 @@ static void mvpp2_txq_bufs_free(struct mvpp2_port *port,
 			dev_kfree_skb_any(tx_buf->skb);
 		else if (tx_buf->type == MVPP2_TYPE_XDP_TX ||
 			 tx_buf->type == MVPP2_TYPE_XDP_NDO)
-			xdp_return_frame(tx_buf->xdpf);
+			xdp_return_frame_bulk(tx_buf->xdpf, &bq);
 
 		mvpp2_txq_inc_get(txq_pcpu);
 	}
+	xdp_flush_frame_bulk(&bq);
+
+	rcu_read_unlock();
 }
 
 static inline struct mvpp2_rx_queue *mvpp2_get_rx_queue(struct mvpp2_port *port,

Signature · 1 line

2.26.2

Lorenzo Bianconi

author

2020-11-13 12:02 UTC #11 lore raw

PATCH v6 5/5 net: mlx5: add xdp tx return bulking support

Convert mlx5 driver to xdp_return_frame_bulk APIs.

XDP_REDIRECT (upstream codepath): 8.9Mpps XDP_REDIRECT (upstream codepath + bulking APIs): 10.2Mpps

Tested-by Jesper Dangaard Brouer <[email protected]>

Co-developed-by Jesper Dangaard Brouer <[email protected]>

Signed-off-by Jesper Dangaard Brouer <[email protected]>

---
 .../net/ethernet/mellanox/mlx5/core/en/xdp.c  | 22 +++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c +18 -4

index ae90d533a350..2e3e78b0f333 100644
@@ -366,7 +366,8 @@ mlx5e_xmit_xdp_frame(struct mlx5e_xdpsq *sq, struct mlx5e_xmit_data *xdptxd,
 static void mlx5e_free_xdpsq_desc(struct mlx5e_xdpsq *sq,
 				  struct mlx5e_xdp_wqe_info *wi,
 				  u32 *xsk_frames,
-				  bool recycle)
+				  bool recycle,
+				  struct xdp_frame_bulk *bq)
 {
 	struct mlx5e_xdp_info_fifo *xdpi_fifo = &sq->db.xdpi_fifo;
 	u16 i;

@@ -379,7 +380,7 @@ static void mlx5e_free_xdpsq_desc(struct mlx5e_xdpsq *sq,
 			/* XDP_TX from the XSK RQ and XDP_REDIRECT */
 			dma_unmap_single(sq->pdev, xdpi.frame.dma_addr,
 					 xdpi.frame.xdpf->len, DMA_TO_DEVICE);
-			xdp_return_frame(xdpi.frame.xdpf);
+			xdp_return_frame_bulk(xdpi.frame.xdpf, bq);
 			break;
 		case MLX5E_XDP_XMIT_MODE_PAGE:
 			/* XDP_TX from the regular RQ */

@@ -397,12 +398,15 @@ static void mlx5e_free_xdpsq_desc(struct mlx5e_xdpsq *sq,
 
 bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
 {
+	struct xdp_frame_bulk bq;
 	struct mlx5e_xdpsq *sq;
 	struct mlx5_cqe64 *cqe;
 	u32 xsk_frames = 0;
 	u16 sqcc;
 	int i;
 
+	xdp_frame_bulk_init(&bq);
+
 	sq = container_of(cq, struct mlx5e_xdpsq, cq);
 
 	if (unlikely(!test_bit(MLX5E_SQ_STATE_ENABLED, &sq->state)))

@@ -434,7 +438,7 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
 
 			sqcc += wi->num_wqebbs;
 
-			mlx5e_free_xdpsq_desc(sq, wi, &xsk_frames, true);
+			mlx5e_free_xdpsq_desc(sq, wi, &xsk_frames, true, &bq);
 		} while (!last_wqe);
 
 		if (unlikely(get_cqe_opcode(cqe) != MLX5_CQE_REQ)) {

@@ -447,6 +451,8 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
 		}
 	} while ((++i < MLX5E_TX_CQ_POLL_BUDGET) && (cqe = mlx5_cqwq_get_cqe(&cq->wq)));
 
+	xdp_flush_frame_bulk(&bq);
+
 	if (xsk_frames)
 		xsk_tx_completed(sq->xsk_pool, xsk_frames);

@@ -463,8 +469,13 @@ bool mlx5e_poll_xdpsq_cq(struct mlx5e_cq *cq)
 
 void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq)
 {
+	struct xdp_frame_bulk bq;
 	u32 xsk_frames = 0;
 
+	xdp_frame_bulk_init(&bq);
+
+	rcu_read_lock(); /* need for xdp_return_frame_bulk */
+
 	while (sq->cc != sq->pc) {
 		struct mlx5e_xdp_wqe_info *wi;
 		u16 ci;

@@ -474,9 +485,12 @@ void mlx5e_free_xdpsq_descs(struct mlx5e_xdpsq *sq)
 
 		sq->cc += wi->num_wqebbs;
 
-		mlx5e_free_xdpsq_desc(sq, wi, &xsk_frames, false);
+		mlx5e_free_xdpsq_desc(sq, wi, &xsk_frames, false, &bq);
 	}
 
+	xdp_flush_frame_bulk(&bq);
+	rcu_read_unlock();
+
 	if (xsk_frames)
 		xsk_tx_completed(sq->xsk_pool, xsk_frames);
 }

Signature · 1 line

2.26.2

John Fastabend

maintainer Acked-by on v6 5/5

2020-11-13 20:11 UTC #12 lore raw

RE: [PATCH v6 net-nex 5/5] net: mlx5: add xdp tx return bulking support

Quoted 4 lines · Lorenzo Bianconi

Convert mlx5 driver to xdp_return_frame_bulk APIs.
XDP_REDIRECT (upstream codepath): 8.9Mpps XDP_REDIRECT (upstream codepath + bulking APIs): 10.2Mpps

Hard to argue an extra 1+mpps.

Quoted 8 lines

Tested-by Jesper Dangaard Brouer <[email protected]>
Co-developed-by Jesper Dangaard Brouer <[email protected]>
Signed-off-by Jesper Dangaard Brouer <[email protected]>
Signed-off-by Lorenzo Bianconi <[email protected]>
---
 .../net/ethernet/mellanox/mlx5/core/en/xdp.c  | 22 +++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

LGTM.