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64050b5b87
On the Rx side, the next_to_use index points to the next item in the
HW ring to be refilled/allocated, and next_to_clean points to the next
item to potentially be processed.
When the HW Rx ring is fully refilled, i.e. no packets has been
processed, the next_to_use will be next_to_clean - 1. When the ring is
fully processed next_to_clean will be equal to next_to_use. The latter
case is where a bug is triggered.
If the next_to_use bits are not cleared, and the "fully processed"
state is entered, a stale descriptor can be processed.
The skb-path correctly clear the status bit for the next_to_use
descriptor, but the AF_XDP zero-copy path did not do that.
This change adds the status bits clearing of the next_to_use
descriptor.
Fixes:
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|---|---|---|
| .. | ||
| i40e.h | ||
| i40e_adminq.c | ||
| i40e_adminq.h | ||
| i40e_adminq_cmd.h | ||
| i40e_alloc.h | ||
| i40e_client.c | ||
| i40e_common.c | ||
| i40e_dcb.c | ||
| i40e_dcb.h | ||
| i40e_dcb_nl.c | ||
| i40e_ddp.c | ||
| i40e_debugfs.c | ||
| i40e_devids.h | ||
| i40e_diag.c | ||
| i40e_diag.h | ||
| i40e_ethtool.c | ||
| i40e_hmc.c | ||
| i40e_hmc.h | ||
| i40e_lan_hmc.c | ||
| i40e_lan_hmc.h | ||
| i40e_main.c | ||
| i40e_nvm.c | ||
| i40e_osdep.h | ||
| i40e_prototype.h | ||
| i40e_ptp.c | ||
| i40e_register.h | ||
| i40e_status.h | ||
| i40e_trace.h | ||
| i40e_txrx.c | ||
| i40e_txrx.h | ||
| i40e_txrx_common.h | ||
| i40e_type.h | ||
| i40e_virtchnl_pf.c | ||
| i40e_virtchnl_pf.h | ||
| i40e_xsk.c | ||
| i40e_xsk.h | ||
| Makefile | ||