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b88b826ec5
xp_assign_dev() sets XDP_UMEM_SG_FLAG before checking whether the
device supports multibuffer zero-copy. If assignment fails, xsk_bind()
destroys the pool but retains the registered UMEM. A subsequent bind
without XDP_USE_SG inherits the stale flag.
The flag also changes RX buffer sizing after DMA mapping. On igc, a
failed SG bind followed by a non-SG retry with 4096-byte chunks and
1792 bytes of headroom passes admission with 2048 bytes, but programs
a 1024-byte RX buffer. On I225-V hardware, an ordinary 1514-byte frame
is truncated to 1024 bytes or 1008 with RX timestamps enabled.
Restoring the original flags eliminates the truncation in both cases.
Save the UMEM flags before assignment and restore them on failure.
Discovered during development of AF_XDP changes for igc.
Fixes:
|
||
|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| xdp_umem.c | ||
| xdp_umem.h | ||
| xsk_buff_pool.c | ||
| xsk_diag.c | ||
| xsk_queue.c | ||
| xsk_queue.h | ||
| xsk.c | ||
| xsk.h | ||
| xskmap.c | ||