netdev - [PATCH v3 net-next 03/12] qed: Add ll2 option for dropping a tx packet

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Date:   Mon, 9 Oct 2017 12:37:45 +0300
From:   Michal Kalderon <Michal.Kalderon@...ium.com>
To:     <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        <dledford@...hat.com>,
        Michal Kalderon <Michal.Kalderon@...ium.com>,
        "Ariel Elior" <Ariel.Elior@...ium.com>
Subject: [PATCH v3 net-next 03/12] qed: Add ll2 option for dropping a tx packet

The option of sending a packet on the ll2 and dropping it exists in
hardware and was not used until now, thus not exposed.
The iWARP unaligned MPA flow requires this functionality for
flushing the tx queue.

Signed-off-by: Michal Kalderon <Michal.Kalderon@...ium.com>
Signed-off-by: Ariel Elior <Ariel.Elior@...ium.com>
---
 drivers/net/ethernet/qlogic/qed/qed_ll2.c | 16 ++++++++++++++--
 include/linux/qed/qed_ll2_if.h            |  1 +
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_ll2.c b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
index 3c695da..ad67d36 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_ll2.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_ll2.c
@@ -1597,8 +1597,20 @@ static void qed_ll2_prepare_tx_packet_set(struct qed_hwfn *p_hwfn,
 	roce_flavor = (pkt->qed_roce_flavor == QED_LL2_ROCE) ? CORE_ROCE
 							     : CORE_RROCE;
 
-	tx_dest = (pkt->tx_dest == QED_LL2_TX_DEST_NW) ? CORE_TX_DEST_NW
-						       : CORE_TX_DEST_LB;
+	switch (pkt->tx_dest) {
+	case QED_LL2_TX_DEST_NW:
+		tx_dest = CORE_TX_DEST_NW;
+		break;
+	case QED_LL2_TX_DEST_LB:
+		tx_dest = CORE_TX_DEST_LB;
+		break;
+	case QED_LL2_TX_DEST_DROP:
+		tx_dest = CORE_TX_DEST_DROP;
+		break;
+	default:
+		tx_dest = CORE_TX_DEST_LB;
+		break;
+	}
 
 	start_bd = (struct core_tx_bd *)qed_chain_produce(p_tx_chain);
 	start_bd->nw_vlan_or_lb_echo = cpu_to_le16(pkt->vlan);
diff --git a/include/linux/qed/qed_ll2_if.h b/include/linux/qed/qed_ll2_if.h
index d7cca59..95fdf02 100644
--- a/include/linux/qed/qed_ll2_if.h
+++ b/include/linux/qed/qed_ll2_if.h
@@ -64,6 +64,7 @@ enum qed_ll2_roce_flavor_type {
 enum qed_ll2_tx_dest {
 	QED_LL2_TX_DEST_NW, /* Light L2 TX Destination to the Network */
 	QED_LL2_TX_DEST_LB, /* Light L2 TX Destination to the Loopback */
+	QED_LL2_TX_DEST_DROP, /* Light L2 Drop the TX packet */
 	QED_LL2_TX_DEST_MAX
 };
 
-- 
1.8.3.1