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| author | Alexander Motin <mav@FreeBSD.org> | 2021-02-22 22:21:05 +0000 |
|---|---|---|
| committer | Alexander Motin <mav@FreeBSD.org> | 2021-02-25 01:40:56 +0000 |
| commit | 2eb9b105f3e473e1438944cc95e36d7912b3296e (patch) | |
| tree | 69759aa8104cc8a39cdaf9dd4efc5014e2850b69 | |
| parent | 64809c763b0c73fe488b61601670067056b07780 (diff) | |
| download | src-2eb9b105f3e473e1438944cc95e36d7912b3296e.tar.gz src-2eb9b105f3e473e1438944cc95e36d7912b3296e.zip | |
cxgb(4): Rework my commit 9dc7c250.
The previous implementation was reported to try to coalesce packets
in situations when it should not, that resulted in assertion later.
This implementation better checks the first packet of the chain for
the coallescing elligibility.
(cherry picked from commit d510bf133d045d6c83742aeda6949bec150f6cbf)
| -rw-r--r-- | sys/dev/cxgb/cxgb_sge.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/sys/dev/cxgb/cxgb_sge.c b/sys/dev/cxgb/cxgb_sge.c index 489d74459ae1..07eb91a4d04c 100644 --- a/sys/dev/cxgb/cxgb_sge.c +++ b/sys/dev/cxgb/cxgb_sge.c @@ -312,20 +312,22 @@ set_wr_hdr(struct work_request_hdr *wrp, uint32_t wr_hi, uint32_t wr_lo) struct coalesce_info { int count; int nbytes; + int noncoal; }; static int coalesce_check(struct mbuf *m, void *arg) { struct coalesce_info *ci = arg; - int *count = &ci->count; - int *nbytes = &ci->nbytes; - - if ((*nbytes == 0) || ((*nbytes + m->m_len <= 10500) && - (*count < 7) && (m->m_next == NULL) && - ((mtod(m, vm_offset_t) & PAGE_MASK) + m->m_len <= PAGE_SIZE))) { - *count += 1; - *nbytes += m->m_len; + + if ((m->m_next != NULL) || + ((mtod(m, vm_offset_t) & PAGE_MASK) + m->m_len > PAGE_SIZE)) + ci->noncoal = 1; + + if ((ci->count == 0) || (ci->noncoal == 0 && (ci->count < 7) && + (ci->nbytes + m->m_len <= 10500))) { + ci->count++; + ci->nbytes += m->m_len; return (1); } return (0); @@ -342,7 +344,7 @@ cxgb_dequeue(struct sge_qset *qs) return TXQ_RING_DEQUEUE(qs); m_head = m_tail = NULL; - ci.count = ci.nbytes = 0; + ci.count = ci.nbytes = ci.noncoal = 0; do { m = TXQ_RING_DEQUEUE_COND(qs, coalesce_check, &ci); if (m_head == NULL) { |