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cxgb4: Account for stid entries properly in case of IPv6 

IPv6 uses 2 TIDs with CLIP enabled and 4 TIDs without CLIP.
Currently we are incrementing STIDs in use by 1 for both IPv4 and IPv6 which
is wrong.

Further, driver currently does not have interface to query if CLIP is programmed
for particular IPv6 address. So, in this patch we increment/decrement TIDs in use
by 4 for IPv6 assuming absence of CLIP. Such assumption keeps us on safe side and
we don't end up allocating more stids for IPv6 than actually supported.

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 16:38:22 +05:30 committed by David S. Miller
parent 470c60c47a
commit 15f63b74c2
1 changed files with 12 additions and 2 deletions
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14
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
View File

@ -2986,7 +2986,14 @@ int cxgb4_alloc_stid(struct tid_info *t, int family, void *data)
if (stid >= 0) {
t->stid_tab[stid].data = data;
stid += t->stid_base;
t->stids_in_use++;
/* IPv6 requires max of 520 bits or 16 cells in TCAM
* This is equivalent to 4 TIDs. With CLIP enabled it
* needs 2 TIDs.
*/
if (family == PF_INET)
t->stids_in_use++;
else
t->stids_in_use += 4;
}
spin_unlock_bh(&t->stid_lock);
return stid;
@ -3039,7 +3046,10 @@ void cxgb4_free_stid(struct tid_info *t, unsigned int stid, int family)
else
bitmap_release_region(t->stid_bmap, stid, 2);
t->stid_tab[stid].data = NULL;
t->stids_in_use--;
if (family == PF_INET)
t->stids_in_use--;
else
t->stids_in_use -= 4;
spin_unlock_bh(&t->stid_lock);
}
EXPORT_SYMBOL(cxgb4_free_stid);