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MFC r271784 - Fix the handling of EOP in status descriptors for if_igb(4)

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and don't double-free mbufs.

Like ixgbe(4) chipsets, EOP is only set on the final descriptor
in a chain of descriptors.  So, to free the whole list of descriptors,
we should free the current slot _and_ the assembled list of descriptors
that make up the fragment list.

The existing code was setting discard once it saw EOP + an error status;
it then freed all the subsequent descriptors until the next EOP. That's
totally the wrong order.
This commit is contained in:
adrian 2014-10-11 22:13:24 +00:00
parent 5995ee9a98
commit 7f559d779a
2 changed files with 8 additions and 9 deletions
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16
sys/dev/e1000/if_igb.c
View File

@ -4397,7 +4397,6 @@ igb_setup_receive_ring(struct rx_ring *rxr)
rxr->fmp = NULL;
rxr->lmp = NULL;
rxr->discard = FALSE;
bus_dmamap_sync(rxr->rxdma.dma_tag, rxr->rxdma.dma_map,
BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
@ -4873,15 +4872,16 @@ igb_rxeof(struct igb_queue *que, int count, int *done)
hdr = le16toh(cur->wb.lower.lo_dword.hs_rss.hdr_info);
eop = ((staterr & E1000_RXD_STAT_EOP) == E1000_RXD_STAT_EOP);
/* Make sure all segments of a bad packet are discarded */
if (((staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) != 0) ||
(rxr->discard)) {
/*
* Free the frame (all segments) if we're at EOP and
* it's an error.
*
* The datasheet states that EOP + status is only valid for
* the final segment in a multi-segment frame.
*/
if (eop && ((staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) != 0)) {
adapter->dropped_pkts++;
++rxr->rx_discarded;
if (!eop) /* Catch subsequent segs */
rxr->discard = TRUE;
else
rxr->discard = FALSE;
igb_rx_discard(rxr, i);
goto next_desc;
}

1
sys/dev/e1000/if_igb.h
View File

@ -336,7 +336,6 @@ struct rx_ring {
struct lro_ctrl lro;
bool lro_enabled;
bool hdr_split;
bool discard;
struct mtx rx_mtx;
char mtx_name[16];
u32 next_to_refresh;