From f5980d099295d4113635ded88425834a38d17125 Mon Sep 17 00:00:00 2001 From: Dmitry Kravkov Date: Thu, 24 Jul 2014 18:54:47 +0300 Subject: [PATCH] bnx2x: fix crash during TSO tunneling [ Upstream commit fe26566d8a05151ba1dce75081f6270f73ec4ae1 ] When TSO packet is transmitted additional BD w/o mapping is used to describe the packed. The BD needs special handling in tx completion. kernel: Call Trace: kernel: [] dump_stack+0x19/0x1b kernel: [] warn_slowpath_common+0x61/0x80 kernel: [] warn_slowpath_fmt+0x5c/0x80 kernel: [] ? find_iova+0x4d/0x90 kernel: [] intel_unmap_page.part.36+0x142/0x160 kernel: [] intel_unmap_page+0x26/0x30 kernel: [] bnx2x_free_tx_pkt+0x157/0x2b0 [bnx2x] kernel: [] bnx2x_tx_int+0xac/0x220 [bnx2x] kernel: [] ? read_tsc+0x9/0x20 kernel: [] bnx2x_poll+0xbb/0x3c0 [bnx2x] kernel: [] net_rx_action+0x15a/0x250 kernel: [] __do_softirq+0xf7/0x290 kernel: [] call_softirq+0x1c/0x30 kernel: [] do_softirq+0x55/0x90 kernel: [] irq_exit+0x115/0x120 kernel: [] do_IRQ+0x58/0xf0 kernel: [] common_interrupt+0x6d/0x6d kernel: [] ? clockevents_notify+0x127/0x140 kernel: [] ? cpuidle_enter_state+0x4f/0xc0 kernel: [] cpuidle_idle_call+0xc5/0x200 kernel: [] arch_cpu_idle+0xe/0x30 kernel: [] cpu_startup_entry+0xf5/0x290 kernel: [] start_secondary+0x265/0x27b kernel: ---[ end trace 11aa7726f18d7e80 ]--- Fixes: a848ade408b ("bnx2x: add CSUM and TSO support for encapsulation protocols") Reported-by: Yulong Pei Cc: Michal Schmidt Signed-off-by: Dmitry Kravkov Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/broadcom/bnx2x/bnx2x.h | 1 + drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c | 9 +++++++++ 2 files changed, 10 insertions(+) diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h index 3dba2a70a00e..ec86177be1df 100644 --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x.h @@ -312,6 +312,7 @@ struct sw_tx_bd { u8 flags; /* Set on the first BD descriptor when there is a split BD */ #define BNX2X_TSO_SPLIT_BD (1<<0) +#define BNX2X_HAS_SECOND_PBD (1<<1) }; struct sw_rx_page { diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c index b04f7f128f49..372a7557e1fa 100644 --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c @@ -180,6 +180,12 @@ static u16 bnx2x_free_tx_pkt(struct bnx2x *bp, struct bnx2x_fp_txdata *txdata, --nbd; bd_idx = TX_BD(NEXT_TX_IDX(bd_idx)); + if (tx_buf->flags & BNX2X_HAS_SECOND_PBD) { + /* Skip second parse bd... */ + --nbd; + bd_idx = TX_BD(NEXT_TX_IDX(bd_idx)); + } + /* TSO headers+data bds share a common mapping. See bnx2x_tx_split() */ if (tx_buf->flags & BNX2X_TSO_SPLIT_BD) { tx_data_bd = &txdata->tx_desc_ring[bd_idx].reg_bd; @@ -3755,6 +3761,9 @@ netdev_tx_t bnx2x_start_xmit(struct sk_buff *skb, struct net_device *dev) /* set encapsulation flag in start BD */ SET_FLAG(tx_start_bd->general_data, ETH_TX_START_BD_TUNNEL_EXIST, 1); + + tx_buf->flags |= BNX2X_HAS_SECOND_PBD; + nbd++; } else if (xmit_type & XMIT_CSUM) { /* Set PBD in checksum offload case w/o encapsulation */ -- 2.20.1