From 31c37a6f21d86e6bca095b71d603ed543ae070ad Mon Sep 17 00:00:00 2001 From: Neerav Parikh Date: Mon, 24 Sep 2012 11:52:45 -0700 Subject: [PATCH] [SCSI] fcoe: Fix write errors on NPIV ports SCSI errors were generated while writing to LUNs connected via NPIV ports. Debugging this it was found that the FCoE packets transmitted via the NPIV ports were not tagged with correct user priority as negotiated with peer by DCB agent. This resulted in FCoE traffic going with priority zero(0) that did not have priority flow control (PFC) enabled for it. The initiator after transferring data to the target never saw any reply indicating the transfer was complete. This resulted in error recovery (ABTS) and SCSI command retries by the scsi-mid layer; eventually resulting in I/O errors. This patch fixes this issue by keeping the FCoE user priority information in the fcoe_interface instance that is common for both the physical port as well as NPIV ports connected to that physical port; instead of storing it in fcoe_port structure that has a per port instance. Signed-off-by: Neerav Parikh Acked-by: Yi Zou Acked-by: John Fastabend Tested-by: Marcus Dennis Signed-off-by: Robert Love Signed-off-by: James Bottomley --- drivers/scsi/fcoe/fcoe.c | 14 +++++--------- drivers/scsi/fcoe/fcoe.h | 2 ++ include/scsi/libfcoe.h | 2 -- 3 files changed, 7 insertions(+), 11 deletions(-) diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c index 078d262..666b7ac 100644 --- a/drivers/scsi/fcoe/fcoe.c +++ b/drivers/scsi/fcoe/fcoe.c @@ -1643,7 +1643,7 @@ static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp) skb_reset_network_header(skb); skb->mac_len = elen; skb->protocol = htons(ETH_P_FCOE); - skb->priority = port->priority; + skb->priority = fcoe->priority; if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN && fcoe->realdev->features & NETIF_F_HW_VLAN_TX) { @@ -1917,7 +1917,6 @@ static int fcoe_dcb_app_notification(struct notifier_block *notifier, struct fcoe_ctlr *ctlr; struct fcoe_interface *fcoe; struct net_device *netdev; - struct fcoe_port *port; int prio; if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE) @@ -1946,10 +1945,8 @@ static int fcoe_dcb_app_notification(struct notifier_block *notifier, entry->app.protocol == ETH_P_FCOE) ctlr->priority = prio; - if (entry->app.protocol == ETH_P_FCOE) { - port = lport_priv(ctlr->lp); - port->priority = prio; - } + if (entry->app.protocol == ETH_P_FCOE) + fcoe->priority = prio; return NOTIFY_OK; } @@ -2180,7 +2177,6 @@ static void fcoe_dcb_create(struct fcoe_interface *fcoe) u8 fup, up; struct net_device *netdev = fcoe->realdev; struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe); - struct fcoe_port *port = lport_priv(ctlr->lp); struct dcb_app app = { .priority = 0, .protocol = ETH_P_FCOE @@ -2202,8 +2198,8 @@ static void fcoe_dcb_create(struct fcoe_interface *fcoe) fup = dcb_getapp(netdev, &app); } - port->priority = ffs(up) ? ffs(up) - 1 : 0; - ctlr->priority = ffs(fup) ? ffs(fup) - 1 : port->priority; + fcoe->priority = ffs(up) ? ffs(up) - 1 : 0; + ctlr->priority = ffs(fup) ? ffs(fup) - 1 : fcoe->priority; } #endif } diff --git a/drivers/scsi/fcoe/fcoe.h b/drivers/scsi/fcoe/fcoe.h index a624add4..b42dc32c 100644 --- a/drivers/scsi/fcoe/fcoe.h +++ b/drivers/scsi/fcoe/fcoe.h @@ -71,6 +71,7 @@ do { \ * @oem: The offload exchange manager for all local port * instances associated with this port * @removed: Indicates fcoe interface removed from net device + * @priority: Priority for the FCoE packet (DCB) * This structure is 1:1 with a net device. */ struct fcoe_interface { @@ -81,6 +82,7 @@ struct fcoe_interface { struct packet_type fip_packet_type; struct fc_exch_mgr *oem; u8 removed; + u8 priority; }; #define fcoe_to_ctlr(x) \ diff --git a/include/scsi/libfcoe.h b/include/scsi/libfcoe.h index 22b07cc..8742d85 100644 --- a/include/scsi/libfcoe.h +++ b/include/scsi/libfcoe.h @@ -327,7 +327,6 @@ struct fcoe_percpu_s { * @lport: The associated local port * @fcoe_pending_queue: The pending Rx queue of skbs * @fcoe_pending_queue_active: Indicates if the pending queue is active - * @priority: Packet priority (DCB) * @max_queue_depth: Max queue depth of pending queue * @min_queue_depth: Min queue depth of pending queue * @timer: The queue timer @@ -343,7 +342,6 @@ struct fcoe_port { struct fc_lport *lport; struct sk_buff_head fcoe_pending_queue; u8 fcoe_pending_queue_active; - u8 priority; u32 max_queue_depth; u32 min_queue_depth; struct timer_list timer; -- 2.7.4