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authorJon Mason <jon.mason@intel.com>2013-02-01 15:45:16 -0700
committerJon Mason <jon.mason@intel.com>2013-05-15 10:57:59 -0700
commitc9d534c8cbaedbb522a1d2cb037c6c394f610317 (patch)
treeeaea8a1c31a0a0a0d850b07590704a3b57fdbca5 /drivers/ntb/ntb_transport.c
parent90f9e934647e652a69396e18c779215a493271cf (diff)
downloadlinux-linaro-stable-c9d534c8cbaedbb522a1d2cb037c6c394f610317.tar.gz
NTB: Correctly handle receive buffers of the minimal size
The ring logic of the NTB receive buffer/transmit memory window requires there to be at least 2 payload sized allotments. For the minimal size case, split the buffer into two and set the transport_mtu to the appropriate size. Signed-off-by: Jon Mason <jon.mason@intel.com>
Diffstat (limited to 'drivers/ntb/ntb_transport.c')
-rw-r--r--drivers/ntb/ntb_transport.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 73a000ed7a9f..cd9745b062e4 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -490,11 +490,12 @@ static void ntb_transport_setup_qp_mw(struct ntb_transport *nt,
rx_size -= sizeof(struct ntb_rx_info);
qp->rx_buff = qp->remote_rx_info + 1;
- qp->rx_max_frame = min(transport_mtu, rx_size);
+ /* Due to housekeeping, there must be atleast 2 buffs */
+ qp->rx_max_frame = min(transport_mtu, rx_size / 2);
qp->rx_max_entry = rx_size / qp->rx_max_frame;
qp->rx_index = 0;
- qp->remote_rx_info->entry = qp->rx_max_entry;
+ qp->remote_rx_info->entry = qp->rx_max_entry - 1;
/* setup the hdr offsets with 0's */
for (i = 0; i < qp->rx_max_entry; i++) {
@@ -818,7 +819,8 @@ static void ntb_transport_init_queue(struct ntb_transport *nt,
tx_size -= sizeof(struct ntb_rx_info);
qp->tx_mw = qp->rx_info + 1;
- qp->tx_max_frame = min(transport_mtu, tx_size);
+ /* Due to housekeeping, there must be atleast 2 buffs */
+ qp->tx_max_frame = min(transport_mtu, tx_size / 2);
qp->tx_max_entry = tx_size / qp->tx_max_frame;
if (nt->debugfs_dir) {