[thunderx] Fix hardware deinitialization

It is required to reset BGX context state for the LMAC using
BGX_CMR_CONFIG register.

This solves problem with network connectivity in Linux booted from
iPXE.

Signed-off-by: Bartosz Szczepanek <bartosz.szczepanek@cavium.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/drivers/net/thunderx.c b/src/drivers/net/thunderx.c
index 306adc459db6d60f734c0c4657d8e6ebffb49ab0..901ecba11247f2c6d2e688dd46f71bfb00510893 100644 (file)
--- a/src/drivers/net/thunderx.c
+++ b/src/drivers/net/thunderx.c
@@ -1146,10 +1146,17 @@ static int txnic_lmac_probe ( struct txnic_lmac *lmac ) {
  * @v lmac             Logical MAC
  */
 static void txnic_lmac_remove ( struct txnic_lmac *lmac ) {
+       uint64_t config;
 
        /* Sanity check */
        assert ( lmac->vnic != NULL );
 
+       /* Disable packet receive and transmit */
+       config = readq ( lmac->regs + BGX_CMR_CONFIG );
+       config &= ~( BGX_CMR_CONFIG_DATA_PKT_TX_EN |
+                    BGX_CMR_CONFIG_DATA_PKT_RX_EN );
+       writeq ( config, ( lmac->regs + BGX_CMR_CONFIG ) );
+
        /* Unregister network device */
        unregister_netdev ( lmac->vnic->netdev );