From: Kumar Sanghvi Date: Wed, 18 Dec 2013 11:08:22 +0000 (+0530) Subject: cxgb4: Account for stid entries properly in case of IPv6 X-Git-Tag: v3.13-rc7~13^2~18^2~4 X-Git-Url: http://git.cascardo.eti.br/?a=commitdiff_plain;h=15f63b74c25797f9246b1738f0cfabd5febe226e;p=cascardo%2Flinux.git 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 Signed-off-by: Kumar Sanghvi Signed-off-by: Hariprasad Shenai Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c index f4f46fcea7b7..f9ca36c25677 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c @@ -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);