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>

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index d6b12e0..f36f8e1 100644 (file)
--- 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;
 }