From b6f8eaece6d5f0247931b6dac140e6cf876f48de Mon Sep 17 00:00:00 2001
From: Kumar Sanghvi <kumaras@chelsio.com>
Date: Wed, 18 Dec 2013 16:38:19 +0530
Subject: [PATCH] cxgb4: Reserve stid 0 for T4/T5 adapters

When creating offload server entries, an IPv6 passive connection request
can trigger a reply with a null STID, whereas the driver would expect
the reply 'STID to match the value used for the request.
This happens due to h/w limitation on T4 and T5.

This patch ensures that STID 0 is never used if the stid range starts
from zero.

Based on original work by Santosh Rastapur <santosh@chelsio.com>

Signed-off-by: Kumar Sanghvi <kumaras@chelsio.com>
Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index d6b12e035a7d..f36f8e1a101c 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -3134,6 +3134,7 @@ static int tid_init(struct tid_info *t)
 	size_t size;
 	unsigned int stid_bmap_size;
 	unsigned int natids = t->natids;
+	struct adapter *adap = container_of(t, struct adapter, tids);
 
 	stid_bmap_size = BITS_TO_LONGS(t->nstids + t->nsftids);
 	size = t->ntids * sizeof(*t->tid_tab) +
@@ -3167,6 +3168,11 @@ static int tid_init(struct tid_info *t)
 		t->afree = t->atid_tab;
 	}
 	bitmap_zero(t->stid_bmap, t->nstids + t->nsftids);
+	/* Reserve stid 0 for T4/T5 adapters */
+	if (!t->stid_base &&
+	    (is_t4(adap->params.chip) || is_t5(adap->params.chip)))
+		__set_bit(0, t->stid_bmap);
+
 	return 0;
 }
 
-- 
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