cxgb4vf: Fix SGE FL buffer initialization logic for 64K pages

[ Upstream commit ea0a42109aee7b92e631c4eb3f2219fadf58acdd ]

We'd come in with SGE_FL_BUFFER_SIZE[0] and [1] both equal to 64KB and
the extant logic would flag that as an error. This was already fixed in
cxgb4 driver with "92ddcc7 cxgb4: Fix some small bugs in
t4_sge_init_soft() when our Page Size is 64KB".

Original Work by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: Arjun Vynipadath <arjun@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/chelsio/cxgb4vf/sge.c b/drivers/net/ethernet/chelsio/cxgb4vf/sge.c
index 05498e7f284034d86a8f8531de95cf7f59ec4890..6246003f9922f1a6fce43fca209afc525183ef7a 100644 (file)
--- a/drivers/net/ethernet/chelsio/cxgb4vf/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4vf/sge.c
@@ -2619,8 +2619,8 @@ void t4vf_sge_stop(struct adapter *adapter)
 int t4vf_sge_init(struct adapter *adapter)
 {
        struct sge_params *sge_params = &adapter->params.sge;
-       u32 fl0 = sge_params->sge_fl_buffer_size[0];
-       u32 fl1 = sge_params->sge_fl_buffer_size[1];
+       u32 fl_small_pg = sge_params->sge_fl_buffer_size[0];
+       u32 fl_large_pg = sge_params->sge_fl_buffer_size[1];
        struct sge *s = &adapter->sge;
 
        /*
@@ -2628,9 +2628,20 @@ int t4vf_sge_init(struct adapter *adapter)
         * the Physical Function Driver.  Ideally we should be able to deal
         * with _any_ configuration.  Practice is different ...
         */
-       if (fl0 != PAGE_SIZE || (fl1 != 0 && fl1 <= fl0)) {
+
+       /* We only bother using the Large Page logic if the Large Page Buffer
+        * is larger than our Page Size Buffer.
+        */
+       if (fl_large_pg <= fl_small_pg)
+               fl_large_pg = 0;
+
+       /* The Page Size Buffer must be exactly equal to our Page Size and the
+        * Large Page Size Buffer should be 0 (per above) or a power of 2.
+        */
+       if (fl_small_pg != PAGE_SIZE ||
+           (fl_large_pg & (fl_large_pg - 1)) != 0) {
                dev_err(adapter->pdev_dev, "bad SGE FL buffer sizes [%d, %d]\n",
-                       fl0, fl1);
+                       fl_small_pg, fl_large_pg);
                return -EINVAL;
        }
        if ((sge_params->sge_control & RXPKTCPLMODE_F) !=
@@ -2642,8 +2653,8 @@ int t4vf_sge_init(struct adapter *adapter)
        /*
         * Now translate the adapter parameters into our internal forms.
         */
-       if (fl1)
-               s->fl_pg_order = ilog2(fl1) - PAGE_SHIFT;
+       if (fl_large_pg)
+               s->fl_pg_order = ilog2(fl_large_pg) - PAGE_SHIFT;
        s->stat_len = ((sge_params->sge_control & EGRSTATUSPAGESIZE_F)
                        ? 128 : 64);
        s->pktshift = PKTSHIFT_G(sge_params->sge_control);