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iw_cxgb4: limit IRD/ORD advertised to ULP by device max.

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The i40iw initiator sends an MPA-request with ird = 63, ord = 63. The
cxgb4 responder sends a RST.  Since the inbound ord=63 and it exceeds
the max_ird/c4iw_max_read_depth (=32 default), chelsio decides to abort.

Instead, cxgb4 should adjust the ord/ird down before presenting it to
the ULP.

Reported-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Steve Wise 2016-08-19 07:29:07 -07:00 committed by Doug Ledford
parent e0cf75deab
commit 7f446abf12
1 changed files with 4 additions and 0 deletions
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4
drivers/infiniband/hw/cxgb4/cm.c
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@ -1827,8 +1827,12 @@ static int process_mpa_request(struct c4iw_ep *ep, struct sk_buff *skb)
(ep->mpa_pkt + sizeof(*mpa));
ep->ird = ntohs(mpa_v2_params->ird) &
MPA_V2_IRD_ORD_MASK;
ep->ird = min_t(u32, ep->ird,
cur_max_read_depth(ep->com.dev));
ep->ord = ntohs(mpa_v2_params->ord) &
MPA_V2_IRD_ORD_MASK;
ep->ord = min_t(u32, ep->ord,
cur_max_read_depth(ep->com.dev));
PDBG("%s initiator ird %u ord %u\n", __func__, ep->ird,
ep->ord);
if (ntohs(mpa_v2_params->ird) & MPA_V2_PEER2PEER_MODEL)