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xsk: Replace the cheap_dma flag with a dma_need_sync flag

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Invert the polarity and better name the flag so that the use case is
properly documented.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200629130359.2690853-3-hch@lst.de
This commit is contained in:
Christoph Hellwig 2020-06-29 15:03:57 +02:00 committed by Daniel Borkmann
parent 3aa9162500
commit 91d5b70273
2 changed files with 5 additions and 6 deletions
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6
include/net/xsk_buff_pool.h
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@ -40,7 +40,7 @@ struct xsk_buff_pool {
u32 headroom;
u32 chunk_size;
u32 frame_len;
bool cheap_dma;
bool dma_need_sync;
bool unaligned;
void *addrs;
struct device *dev;
@ -80,7 +80,7 @@ static inline dma_addr_t xp_get_frame_dma(struct xdp_buff_xsk *xskb)
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)
if (!xskb->pool->dma_need_sync)
return;
xp_dma_sync_for_cpu_slow(xskb);
@ -91,7 +91,7 @@ void xp_dma_sync_for_device_slow(struct xsk_buff_pool *pool, dma_addr_t dma,
static inline void xp_dma_sync_for_device(struct xsk_buff_pool *pool,
dma_addr_t dma, size_t size)
{
if (pool->cheap_dma)
if (!pool->dma_need_sync)
return;
xp_dma_sync_for_device_slow(pool, dma, size);

5
net/xdp/xsk_buff_pool.c
View File

@ -55,7 +55,6 @@ struct xsk_buff_pool *xp_create(struct page **pages, u32 nr_pages, u32 chunks,
pool->free_heads_cnt = chunks;
pool->headroom = headroom;
pool->chunk_size = chunk_size;
pool->cheap_dma = true;
pool->unaligned = unaligned;
pool->frame_len = chunk_size - headroom - XDP_PACKET_HEADROOM;
INIT_LIST_HEAD(&pool->free_list);
@ -195,7 +194,7 @@ int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
xp_check_dma_contiguity(pool);
pool->dev = dev;
pool->cheap_dma = xp_check_cheap_dma(pool);
pool->dma_need_sync = !xp_check_cheap_dma(pool);
return 0;
}
EXPORT_SYMBOL(xp_dma_map);
@ -280,7 +279,7 @@ struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool)
xskb->xdp.data = xskb->xdp.data_hard_start + XDP_PACKET_HEADROOM;
xskb->xdp.data_meta = xskb->xdp.data;
if (!pool->cheap_dma) {
if (pool->dma_need_sync) {
dma_sync_single_range_for_device(pool->dev, xskb->dma, 0,
pool->frame_len,
DMA_BIDIRECTIONAL);