linux-kernel - [PATCH] cxgb4: allow large buffer size to have page size

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Message-Id: <1387820069-13623-1-git-send-email-cascardo@linux.vnet.ibm.com>
Date:	Mon, 23 Dec 2013 15:34:29 -0200
From:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
To:	netdev@...r.kernel.org
Cc:	dm@...lsio.com, linux-kernel@...r.kernel.org, davem@...emloft.net,
	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
Subject: [PATCH] cxgb4: allow large buffer size to have page size

Since commit 52367a763d8046190754ab43743e42638564a2d1
("cxgb4/cxgb4vf: Code cleanup to enable T4 Configuration File support"),
we have failures like this during cxgb4 probe:

cxgb4 0000:01:00.4: bad SGE FL page buffer sizes [65536, 65536]
cxgb4: probe of 0000:01:00.4 failed with error -22

This happens whenever software parameters are used, without a
configuration file. That happens when the hardware was already
initialized (after kexec, or after csiostor is loaded).

It happens that these values are acceptable, rendering fl_pg_order equal
to 0, which is the case of a hard init when the page size is equal or
larger than 65536.

Accepting fl_large_pg equal to fl_small_pg solves the issue, and
shouldn't cause any trouble besides a possible performance reduction
when smaller pages are used. And that can be fixed by a configuration
file.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
---
 drivers/net/ethernet/chelsio/cxgb4/sge.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c
index cc380c3..cc3511a 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c
@@ -2581,7 +2581,7 @@ static int t4_sge_init_soft(struct adapter *adap)
 	#undef READ_FL_BUF
 
 	if (fl_small_pg != PAGE_SIZE ||
-	    (fl_large_pg != 0 && (fl_large_pg <= fl_small_pg ||
+	    (fl_large_pg != 0 && (fl_large_pg < fl_small_pg ||
 				  (fl_large_pg & (fl_large_pg-1)) != 0))) {
 		dev_err(adap->pdev_dev, "bad SGE FL page buffer sizes [%d, %d]\n",
 			fl_small_pg, fl_large_pg);
-- 
1.7.1

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