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Message-Id: <20200514083710.143394-14-bjorn.topel@gmail.com>
Date: Thu, 14 May 2020 10:37:09 +0200
From: Björn Töpel <bjorn.topel@...il.com>
To: ast@...nel.org, daniel@...earbox.net, davem@...emloft.net,
kuba@...nel.org, hawk@...nel.org, john.fastabend@...il.com,
netdev@...r.kernel.org, bpf@...r.kernel.org,
magnus.karlsson@...el.com, jonathan.lemon@...il.com,
jeffrey.t.kirsher@...el.com
Cc: Björn Töpel <bjorn.topel@...el.com>,
maximmi@...lanox.com, maciej.fijalkowski@...el.com
Subject: [PATCH bpf-next v2 13/14] xsk: explicitly inline functions and move definitions
From: Björn Töpel <bjorn.topel@...el.com>
In order to reduce the number of function calls, the struct
xsk_buff_pool definition is moved to xsk_buff_pool.h. The functions
xp_get_dma(), xp_dma_sync_for_cpu(), xp_dma_sync_for_device(),
xp_validate_desc() and various helper functions are explicitly
inlined.
Further, move xp_get_handle() and xp_release() to xsk.c, to allow for
the compiler to perform inlining.
rfc->v1: Make sure xp_validate_desc() is inlined for Tx perf. (Maxim)
Signed-off-by: Björn Töpel <bjorn.topel@...el.com>
---
include/net/xsk_buff_pool.h | 92 +++++++++++++++++++++--
net/xdp/xsk.c | 15 ++++
net/xdp/xsk_buff_pool.c | 142 ++----------------------------------
net/xdp/xsk_queue.h | 45 ++++++++++++
4 files changed, 151 insertions(+), 143 deletions(-)
diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h
index 9abef166441d..029522696ccb 100644
--- a/include/net/xsk_buff_pool.h
+++ b/include/net/xsk_buff_pool.h
@@ -4,6 +4,7 @@
#ifndef XSK_BUFF_POOL_H_
#define XSK_BUFF_POOL_H_
+#include <linux/if_xdp.h>
#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <net/xdp.h>
@@ -24,6 +25,27 @@ struct xdp_buff_xsk {
struct list_head free_list_node;
};
+struct xsk_buff_pool {
+ struct xsk_queue *fq;
+ struct list_head free_list;
+ dma_addr_t *dma_pages;
+ struct xdp_buff_xsk *heads;
+ u64 chunk_mask;
+ u64 addrs_cnt;
+ u32 free_list_cnt;
+ u32 dma_pages_cnt;
+ u32 heads_cnt;
+ u32 free_heads_cnt;
+ u32 headroom;
+ u32 chunk_size;
+ u32 frame_len;
+ bool cheap_dma;
+ bool unaligned;
+ void *addrs;
+ struct device *dev;
+ struct xdp_buff_xsk *free_heads[];
+};
+
/* AF_XDP core. */
struct xsk_buff_pool *xp_create(struct page **pages, u32 nr_pages, u32 chunks,
u32 chunk_size, u32 headroom, u64 size,
@@ -31,8 +53,6 @@ struct xsk_buff_pool *xp_create(struct page **pages, u32 nr_pages, u32 chunks,
void xp_set_fq(struct xsk_buff_pool *pool, struct xsk_queue *fq);
void xp_destroy(struct xsk_buff_pool *pool);
void xp_release(struct xdp_buff_xsk *xskb);
-u64 xp_get_handle(struct xdp_buff_xsk *xskb);
-bool xp_validate_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc);
/* AF_XDP, and XDP core. */
void xp_free(struct xdp_buff_xsk *xskb);
@@ -46,9 +66,69 @@ struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool);
bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count);
void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr);
dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr);
-dma_addr_t xp_get_dma(struct xdp_buff_xsk *xskb);
-void xp_dma_sync_for_cpu(struct xdp_buff_xsk *xskb);
-void xp_dma_sync_for_device(struct xsk_buff_pool *pool, dma_addr_t dma,
- size_t size);
+static inline dma_addr_t xp_get_dma(struct xdp_buff_xsk *xskb)
+{
+ return xskb->dma;
+}
+
+void xp_dma_sync_for_cpu_slow(struct xdp_buff_xsk *xskb);
+static inline void xp_dma_sync_for_cpu(struct xdp_buff_xsk *xskb)
+{
+ if (xskb->pool->cheap_dma)
+ return;
+
+ xp_dma_sync_for_cpu_slow(xskb);
+}
+
+void xp_dma_sync_for_device_slow(struct xsk_buff_pool *pool, dma_addr_t dma,
+ size_t size);
+static inline void xp_dma_sync_for_device(struct xsk_buff_pool *pool,
+ dma_addr_t dma, size_t size)
+{
+ if (pool->cheap_dma)
+ return;
+
+ xp_dma_sync_for_device_slow(pool, dma, size);
+}
+
+/* Masks for xdp_umem_page flags.
+ * The low 12-bits of the addr will be 0 since this is the page address, so we
+ * can use them for flags.
+ */
+#define XSK_NEXT_PG_CONTIG_SHIFT 0
+#define XSK_NEXT_PG_CONTIG_MASK BIT_ULL(XSK_NEXT_PG_CONTIG_SHIFT)
+
+static inline bool xp_desc_crosses_non_contig_pg(struct xsk_buff_pool *pool,
+ u64 addr, u32 len)
+{
+ bool cross_pg = (addr & (PAGE_SIZE - 1)) + len > PAGE_SIZE;
+
+ if (pool->dma_pages_cnt && cross_pg) {
+ return !(pool->dma_pages[addr >> PAGE_SHIFT] &
+ XSK_NEXT_PG_CONTIG_MASK);
+ }
+ return false;
+}
+
+static inline u64 xp_aligned_extract_addr(struct xsk_buff_pool *pool, u64 addr)
+{
+ return addr & pool->chunk_mask;
+}
+
+static inline u64 xp_unaligned_extract_addr(u64 addr)
+{
+ return addr & XSK_UNALIGNED_BUF_ADDR_MASK;
+}
+
+static inline u64 xp_unaligned_extract_offset(u64 addr)
+{
+ return addr >> XSK_UNALIGNED_BUF_OFFSET_SHIFT;
+}
+
+static inline u64 xp_unaligned_add_offset_to_addr(u64 addr)
+{
+ return xp_unaligned_extract_addr(addr) +
+ xp_unaligned_extract_offset(addr);
+}
#endif /* XSK_BUFF_POOL_H_ */
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 3f2ab732ab8b..b6c0f08bd80d 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -99,6 +99,21 @@ bool xsk_umem_uses_need_wakeup(struct xdp_umem *umem)
}
EXPORT_SYMBOL(xsk_umem_uses_need_wakeup);
+void xp_release(struct xdp_buff_xsk *xskb)
+{
+ xskb->pool->free_heads[xskb->pool->free_heads_cnt++] = xskb;
+}
+
+static u64 xp_get_handle(struct xdp_buff_xsk *xskb)
+{
+ u64 offset = xskb->xdp.data - xskb->xdp.data_hard_start;
+
+ offset += xskb->pool->headroom;
+ if (!xskb->pool->unaligned)
+ return xskb->orig_addr + offset;
+ return xskb->orig_addr + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT);
+}
+
static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
{
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index 365bdb5749cc..20ea583133de 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -8,34 +8,6 @@
#include "xsk_queue.h"
-/* Masks for xdp_umem_page flags.
- * The low 12-bits of the addr will be 0 since this is the page address, so we
- * can use them for flags.
- */
-#define XSK_NEXT_PG_CONTIG_SHIFT 0
-#define XSK_NEXT_PG_CONTIG_MASK BIT_ULL(XSK_NEXT_PG_CONTIG_SHIFT)
-
-struct xsk_buff_pool {
- struct xsk_queue *fq;
- struct list_head free_list;
- dma_addr_t *dma_pages;
- struct xdp_buff_xsk *heads;
- u64 chunk_mask;
- u64 addrs_cnt;
- u32 free_list_cnt;
- u32 dma_pages_cnt;
- u32 heads_cnt;
- u32 free_heads_cnt;
- u32 headroom;
- u32 chunk_size;
- u32 frame_len;
- bool cheap_dma;
- bool unaligned;
- void *addrs;
- struct device *dev;
- struct xdp_buff_xsk *free_heads[];
-};
-
static void xp_addr_unmap(struct xsk_buff_pool *pool)
{
vunmap(pool->addrs);
@@ -227,50 +199,12 @@ int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
}
EXPORT_SYMBOL(xp_dma_map);
-static bool xp_desc_crosses_non_contig_pg(struct xsk_buff_pool *pool,
- u64 addr, u32 len)
-{
- bool cross_pg = (addr & (PAGE_SIZE - 1)) + len > PAGE_SIZE;
-
- if (pool->dma_pages_cnt && cross_pg) {
- return !(pool->dma_pages[addr >> PAGE_SHIFT] &
- XSK_NEXT_PG_CONTIG_MASK);
- }
- return false;
-}
-
static bool xp_addr_crosses_non_contig_pg(struct xsk_buff_pool *pool,
u64 addr)
{
return xp_desc_crosses_non_contig_pg(pool, addr, pool->chunk_size);
}
-void xp_release(struct xdp_buff_xsk *xskb)
-{
- xskb->pool->free_heads[xskb->pool->free_heads_cnt++] = xskb;
-}
-
-static u64 xp_aligned_extract_addr(struct xsk_buff_pool *pool, u64 addr)
-{
- return addr & pool->chunk_mask;
-}
-
-static u64 xp_unaligned_extract_addr(u64 addr)
-{
- return addr & XSK_UNALIGNED_BUF_ADDR_MASK;
-}
-
-static u64 xp_unaligned_extract_offset(u64 addr)
-{
- return addr >> XSK_UNALIGNED_BUF_OFFSET_SHIFT;
-}
-
-static u64 xp_unaligned_add_offset_to_addr(u64 addr)
-{
- return xp_unaligned_extract_addr(addr) +
- xp_unaligned_extract_offset(addr);
-}
-
static bool xp_check_unaligned(struct xsk_buff_pool *pool, u64 *addr)
{
*addr = xp_unaligned_extract_addr(*addr);
@@ -368,60 +302,6 @@ void xp_free(struct xdp_buff_xsk *xskb)
}
EXPORT_SYMBOL(xp_free);
-static bool xp_aligned_validate_desc(struct xsk_buff_pool *pool,
- struct xdp_desc *desc)
-{
- u64 chunk, chunk_end;
-
- chunk = xp_aligned_extract_addr(pool, desc->addr);
- chunk_end = xp_aligned_extract_addr(pool, desc->addr + desc->len);
- if (chunk != chunk_end)
- return false;
-
- if (chunk >= pool->addrs_cnt)
- return false;
-
- if (desc->options)
- return false;
- return true;
-}
-
-static bool xp_unaligned_validate_desc(struct xsk_buff_pool *pool,
- struct xdp_desc *desc)
-{
- u64 addr, base_addr;
-
- base_addr = xp_unaligned_extract_addr(desc->addr);
- addr = xp_unaligned_add_offset_to_addr(desc->addr);
-
- if (desc->len > pool->chunk_size)
- return false;
-
- if (base_addr >= pool->addrs_cnt || addr >= pool->addrs_cnt ||
- xp_desc_crosses_non_contig_pg(pool, addr, desc->len))
- return false;
-
- if (desc->options)
- return false;
- return true;
-}
-
-bool xp_validate_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc)
-{
- return pool->unaligned ? xp_unaligned_validate_desc(pool, desc) :
- xp_aligned_validate_desc(pool, desc);
-}
-
-u64 xp_get_handle(struct xdp_buff_xsk *xskb)
-{
- u64 offset = xskb->xdp.data - xskb->xdp.data_hard_start;
-
- offset += xskb->pool->headroom;
- if (!xskb->pool->unaligned)
- return xskb->orig_addr + offset;
- return xskb->orig_addr + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT);
-}
-
void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
{
addr = pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr;
@@ -438,32 +318,20 @@ dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr)
}
EXPORT_SYMBOL(xp_raw_get_dma);
-dma_addr_t xp_get_dma(struct xdp_buff_xsk *xskb)
-{
- return xskb->dma;
-}
-EXPORT_SYMBOL(xp_get_dma);
-
-void xp_dma_sync_for_cpu(struct xdp_buff_xsk *xskb)
+void xp_dma_sync_for_cpu_slow(struct xdp_buff_xsk *xskb)
{
size_t size;
- if (xskb->pool->cheap_dma)
- return;
-
size = xskb->xdp.data_end - xskb->xdp.data;
dma_sync_single_range_for_cpu(xskb->pool->dev, xskb->dma, 0,
size, DMA_BIDIRECTIONAL);
}
-EXPORT_SYMBOL(xp_dma_sync_for_cpu);
+EXPORT_SYMBOL(xp_dma_sync_for_cpu_slow);
-void xp_dma_sync_for_device(struct xsk_buff_pool *pool, dma_addr_t dma,
- size_t size)
+void xp_dma_sync_for_device_slow(struct xsk_buff_pool *pool, dma_addr_t dma,
+ size_t size)
{
- if (pool->cheap_dma)
- return;
-
dma_sync_single_range_for_device(pool->dev, dma, 0,
size, DMA_BIDIRECTIONAL);
}
-EXPORT_SYMBOL(xp_dma_sync_for_device);
+EXPORT_SYMBOL(xp_dma_sync_for_device_slow);
diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h
index 16bf15864788..5b5d24d2dd37 100644
--- a/net/xdp/xsk_queue.h
+++ b/net/xdp/xsk_queue.h
@@ -118,6 +118,51 @@ static inline bool xskq_cons_read_addr_unchecked(struct xsk_queue *q, u64 *addr)
return false;
}
+static inline bool xp_aligned_validate_desc(struct xsk_buff_pool *pool,
+ struct xdp_desc *desc)
+{
+ u64 chunk, chunk_end;
+
+ chunk = xp_aligned_extract_addr(pool, desc->addr);
+ chunk_end = xp_aligned_extract_addr(pool, desc->addr + desc->len);
+ if (chunk != chunk_end)
+ return false;
+
+ if (chunk >= pool->addrs_cnt)
+ return false;
+
+ if (desc->options)
+ return false;
+ return true;
+}
+
+static inline bool xp_unaligned_validate_desc(struct xsk_buff_pool *pool,
+ struct xdp_desc *desc)
+{
+ u64 addr, base_addr;
+
+ base_addr = xp_unaligned_extract_addr(desc->addr);
+ addr = xp_unaligned_add_offset_to_addr(desc->addr);
+
+ if (desc->len > pool->chunk_size)
+ return false;
+
+ if (base_addr >= pool->addrs_cnt || addr >= pool->addrs_cnt ||
+ xp_desc_crosses_non_contig_pg(pool, addr, desc->len))
+ return false;
+
+ if (desc->options)
+ return false;
+ return true;
+}
+
+static inline bool xp_validate_desc(struct xsk_buff_pool *pool,
+ struct xdp_desc *desc)
+{
+ return pool->unaligned ? xp_unaligned_validate_desc(pool, desc) :
+ xp_aligned_validate_desc(pool, desc);
+}
+
static inline bool xskq_cons_is_valid_desc(struct xsk_queue *q,
struct xdp_desc *d,
struct xdp_umem *umem)
--
2.25.1
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