linux-kernel - RE: [RFC PATCH 3/7] Enable pause frame support

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Message-ID: <DM5PR07MB28423DB384D388B4B9F9C6FB8D960@DM5PR07MB2842.namprd07.prod.outlook.com>
Date:   Mon, 26 Dec 2016 14:21:57 +0000
From:   "Koteshwar Rao, Satha" <Satha.Rao@...ium.com>
To:     "Goutham, Sunil" <Sunil.Goutham@...ium.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "rric@...nel.org" <rric@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "Daney, David" <David.Daney@...ium.com>,
        "Vatsavayi, Raghu" <Raghu.Vatsavayi@...ium.com>,
        "Chickles, Derek" <Derek.Chickles@...ium.com>,
        "Romanov, Philip" <Philip.Romanov@...ium.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [RFC PATCH 3/7] Enable pause frame support

Thanks Sunil, will fix this in next version

Thanks,
Satha

From: Goutham, Sunil 
Sent: Wednesday, December 21, 2016 1:20 AM
To: Koteshwar Rao, Satha; linux-kernel@...r.kernel.org
Cc: rric@...nel.org; davem@...emloft.net; Daney, David; Vatsavayi, Raghu; Chickles, Derek; Romanov, Philip; netdev@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH 3/7] Enable pause frame support

>>+#define  BGX_SMUX_CBFC_CTL             0x20218

These macros are already defined.

if you check 'net-next ' branch pause frame support has already been
added. You should send patch on top it if you have further changes
to the existing.

Thanks,
Sunil.

________________________________________
From: Koteshwar Rao, Satha
Sent: Wednesday, December 21, 2016 2:16 PM
To: linux-kernel@...r.kernel.org
Cc: Goutham, Sunil; rric@...nel.org; davem@...emloft.net; Daney, David; Vatsavayi, Raghu; Chickles, Derek; Koteshwar Rao, Satha; Romanov, Philip; netdev@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
Subject: [RFC PATCH 3/7] Enable pause frame support 
 
---
 drivers/net/ethernet/cavium/thunder/thunder_bgx.c | 25 +++++++++++++++++++++++
 drivers/net/ethernet/cavium/thunder/thunder_bgx.h |  7 +++++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
index 050e21f..92d7e04 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.c
@@ -121,6 +121,31 @@ static int bgx_poll_reg(struct bgx *bgx, u8 lmac, u64 reg, u64 mask, bool zero)
         return 1;
 }
 
+void enable_pause_frames(int node, int bgx_idx, int lmac)
+{
+       u64 reg_value = 0;
+       struct bgx *bgx = bgx_vnic[(node * MAX_BGX_PER_NODE) + bgx_idx];
+
+       reg_value =  bgx_reg_read(bgx, lmac, BGX_SMUX_TX_CTL);
+       /* Enable BGX()_SMU()_TX_CTL */
+       if (!(reg_value & L2P_BP_CONV))
+               bgx_reg_write(bgx, lmac, BGX_SMUX_TX_CTL,
+                             (reg_value | (L2P_BP_CONV)));
+
+       reg_value =  bgx_reg_read(bgx, lmac, BGX_SMUX_HG2_CTL);
+       /* Clear if BGX()_SMU()_HG2_CONTROL[HG2TX_EN] is set */
+       if (reg_value & SMUX_HG2_CTL_HG2TX_EN)
+               bgx_reg_write(bgx, lmac, BGX_SMUX_HG2_CTL,
+                             (reg_value & (~SMUX_HG2_CTL_HG2TX_EN)));
+
+       reg_value =  bgx_reg_read(bgx, lmac, BGX_SMUX_CBFC_CTL);
+       /* Clear if BGX()_SMU()_CBFC_CTL[TX_EN] is set */
+       if (reg_value & CBFC_CTL_TX_EN)
+               bgx_reg_write(bgx, lmac, BGX_SMUX_CBFC_CTL,
+                             (reg_value & (~CBFC_CTL_TX_EN)));
+}
+EXPORT_SYMBOL(enable_pause_frames);
+
 /* Return number of BGX present in HW */
 unsigned bgx_get_map(int node)
 {
diff --git a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
index 01cc7c8..5b57bd1 100644
--- a/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
+++ b/drivers/net/ethernet/cavium/thunder/thunder_bgx.h
@@ -131,6 +131,11 @@
 #define BGX_SMUX_TX_CTL                 0x20178
 #define  SMU_TX_CTL_DIC_EN                      BIT_ULL(0)
 #define  SMU_TX_CTL_UNI_EN                      BIT_ULL(1)
+#define  L2P_BP_CONV                           BIT_ULL(7)
+#define  BGX_SMUX_CBFC_CTL             0x20218
+#define  CBFC_CTL_TX_EN                                BIT_ULL(1)
+#define  BGX_SMUX_HG2_CTL              0x20210
+#define SMUX_HG2_CTL_HG2TX_EN                  BIT_ULL(18)
 #define  SMU_TX_CTL_LNK_STATUS                  (3ull << 4)
 #define BGX_SMUX_TX_THRESH              0x20180
 #define BGX_SMUX_CTL                    0x20200
@@ -212,6 +217,8 @@ void bgx_lmac_internal_loopback(int node, int bgx_idx,
 
 u64 bgx_get_rx_stats(int node, int bgx_idx, int lmac, int idx);
 u64 bgx_get_tx_stats(int node, int bgx_idx, int lmac, int idx);
+void enable_pause_frames(int node, int bgx_idx, int lmac);
+
 #define BGX_RX_STATS_COUNT 11
 #define BGX_TX_STATS_COUNT 18
 
-- 
1.8.3.1