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gem: use an explicit dsb sy in the polling RX path #173

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Merged
danielinux merged 1 commit into from
Sep 22, 2026
Merged

gem: use an explicit dsb sy in the polling RX path #173

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4 changes: 2 additions & 2 deletions src/port/amd/ip/gem_rx_poll.c
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Original file line number Diff line number Diff line change
Expand Up @@ -50,10 +50,10 @@ int gem_eth_poll(struct wolfIP_ll_dev *ll, void *buf, uint32_t len)
if (gem_rx_next == RX_RING_LEN - 1)
addr |= RXBUF_WRAP;
gem_rx_ring[gem_rx_next].status = 0;
__asm__ volatile ("dsb" ::: "memory");
__asm__ volatile ("dsb sy" ::: "memory");
gem_rx_ring[gem_rx_next].addr = addr; /* OWN=0 -> hardware can write */
cache_clean(&gem_rx_ring[gem_rx_next], sizeof(gem_rx_ring[gem_rx_next]));
__asm__ volatile ("dsb" ::: "memory");
__asm__ volatile ("dsb sy" ::: "memory");
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dgarske marked this conversation as resolved.

gem_rx_next = (gem_rx_next + 1) % RX_RING_LEN;
return (int)copy;
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