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io_uring/zcrx: split common area map/unmap parts 

Extract area type depedent parts of io_zcrx_[un]map_area from the
generic path. It'll be helpful once there are more area memory types
and not only user pages.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/50f6e893e2d20f937e628196cbf528d15f81c289.1746097431.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
pull/1250/head
Pavel Begunkov 2025-05-01 13:17:17 +01:00 committed by Jens Axboe
parent 782dfa329a
commit 8a62804248
1 changed files with 31 additions and 15 deletions
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46
io_uring/zcrx.c
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@ -82,20 +82,29 @@ static int io_import_area(struct io_zcrx_ifq *ifq,
return 0;
}
static void io_zcrx_unmap_umem(struct io_zcrx_ifq *ifq,
struct io_zcrx_area *area, int nr_mapped)
{
int i;
for (i = 0; i < nr_mapped; i++) {
netmem_ref netmem = net_iov_to_netmem(&area->nia.niovs[i]);
dma_addr_t dma = page_pool_get_dma_addr_netmem(netmem);
dma_unmap_page_attrs(ifq->dev, dma, PAGE_SIZE,
DMA_FROM_DEVICE, IO_DMA_ATTR);
}
}
static void __io_zcrx_unmap_area(struct io_zcrx_ifq *ifq,
struct io_zcrx_area *area, int nr_mapped)
{
int i;
for (i = 0; i < nr_mapped; i++) {
struct net_iov *niov = &area->nia.niovs[i];
dma_addr_t dma;
io_zcrx_unmap_umem(ifq, area, nr_mapped);
dma = page_pool_get_dma_addr_netmem(net_iov_to_netmem(niov));
dma_unmap_page_attrs(ifq->dev, dma, PAGE_SIZE,
DMA_FROM_DEVICE, IO_DMA_ATTR);
net_mp_niov_set_dma_addr(niov, 0);
}
for (i = 0; i < area->nia.num_niovs; i++)
net_mp_niov_set_dma_addr(&area->nia.niovs[i], 0);
}
static void io_zcrx_unmap_area(struct io_zcrx_ifq *ifq, struct io_zcrx_area *area)
@ -107,14 +116,10 @@ static void io_zcrx_unmap_area(struct io_zcrx_ifq *ifq, struct io_zcrx_area *are
area->is_mapped = false;
}
static int io_zcrx_map_area(struct io_zcrx_ifq *ifq, struct io_zcrx_area *area)
static int io_zcrx_map_area_umem(struct io_zcrx_ifq *ifq, struct io_zcrx_area *area)
{
int i;
guard(mutex)(&ifq->dma_lock);
if (area->is_mapped)
return 0;
for (i = 0; i < area->nia.num_niovs; i++) {
struct net_iov *niov = &area->nia.niovs[i];
dma_addr_t dma;
@ -129,9 +134,20 @@ static int io_zcrx_map_area(struct io_zcrx_ifq *ifq, struct io_zcrx_area *area)
break;
}
}
return i;
}
if (i != area->nia.num_niovs) {
__io_zcrx_unmap_area(ifq, area, i);
static int io_zcrx_map_area(struct io_zcrx_ifq *ifq, struct io_zcrx_area *area)
{
unsigned nr;
guard(mutex)(&ifq->dma_lock);
if (area->is_mapped)
return 0;
nr = io_zcrx_map_area_umem(ifq, area);
if (nr != area->nia.num_niovs) {
__io_zcrx_unmap_area(ifq, area, nr);
return -EINVAL;
}