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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>
This commit is contained in:
Kumar Sanghvi 2013-12-18 16:38:19 +05:30 committed by David S. Miller
parent 6eb3c2822e
commit b6f8eaece6
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
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@ -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;
}