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qcacmn: WAR to avoid SG process with wrong continuation bit

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If a continuation bit is set in msdu desc info and reported
length can fit in single buffer avoid SG processing

Change-Id: I6e8c3e1e657c372d5d915450dda20ba26bac495f
This commit is contained in:
Chaithanya Garrepalli
2020-11-28 10:41:22 +05:30
committed by snandini
parent 2f09a8e245
commit 3888d0824e
5 changed files with 24 additions and 5 deletions
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17
dp/wifi3.0/dp_rx.c
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@@ -1177,6 +1177,7 @@ static inline bool dp_rx_adjust_nbuf_len(qdf_nbuf_t nbuf, uint16_t *mpdu_len)
/**
* dp_rx_sg_create() - create a frag_list for MSDUs which are spread across
* multiple nbufs.
* @soc: DP SOC handle
* @nbuf: pointer to the first msdu of an amsdu.
*
* This function implements the creation of RX frag_list for cases
@@ -1184,7 +1185,7 @@ static inline bool dp_rx_adjust_nbuf_len(qdf_nbuf_t nbuf, uint16_t *mpdu_len)
*
* Return: returns the head nbuf which contains complete frag_list.
*/
qdf_nbuf_t dp_rx_sg_create(qdf_nbuf_t nbuf)
qdf_nbuf_t dp_rx_sg_create(struct dp_soc *soc, qdf_nbuf_t nbuf)
{
qdf_nbuf_t parent, frag_list, next = NULL;
uint16_t frag_list_len = 0;
@@ -1230,6 +1231,18 @@ qdf_nbuf_t dp_rx_sg_create(qdf_nbuf_t nbuf)
qdf_nbuf_set_rx_chfrag_start(parent, 1);
last_nbuf = dp_rx_adjust_nbuf_len(parent, &mpdu_len);
/*
* HW issue: MSDU cont bit is set but reported MPDU length can fit
* in to single buffer
*
* Increment error stats and avoid SG list creation
*/
if (last_nbuf) {
DP_STATS_INC(soc, rx.err.msdu_continuation_err, 1);
qdf_nbuf_pull_head(parent, RX_PKT_TLVS_LEN);
return parent;
}
/*
* this is where we set the length of the fragments which are
* associated to the parent nbuf. We iterate through the frag_list
@@ -2668,7 +2681,7 @@ done:
qdf_nbuf_pull_head(nbuf, RX_PKT_TLVS_LEN);
} else if (qdf_nbuf_is_rx_chfrag_cont(nbuf)) {
msdu_len = QDF_NBUF_CB_RX_PKT_LEN(nbuf);
nbuf = dp_rx_sg_create(nbuf);
nbuf = dp_rx_sg_create(soc, nbuf);
next = nbuf->next;
if (qdf_nbuf_is_raw_frame(nbuf)) {