From: Tushar Dave <tushar.n.dave@oracle.com> To: jeffrey.t.kirsher@intel.com, intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org Subject: [PATCH] i40e: Check for skb->queue_mapping Date: Wed, 29 Mar 2017 16:57:54 -0700 [thread overview] Message-ID: <1490831874-6396-1-git-send-email-tushar.n.dave@oracle.com> (raw) There are events seen where skb->queue_mapping value is greater than vsi->num_queue_pairs. In such cases, vsi->tx_ring becomes invalid (null) and xmit results in kernel panic. One such event is running netconsole and enabling VF on the same device. Or running netconsole and changing number of tx queues via ethtool on same device. This patch adds check for skb->queue_mapping and uses simple arithmetic to select available tx queue from driver. Signed-off-by: Tushar Dave <tushar.n.dave@oracle.com> --- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index 97d4605..af73675 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -3008,6 +3008,16 @@ static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb, return NETDEV_TX_OK; } +static inline struct i40e_ring *i40e_get_txq(struct i40e_vsi *vsi, + struct sk_buff *skb) +{ + unsigned int txq = skb->queue_mapping; + + if (txq >= vsi->num_queue_pairs) + txq = txq % vsi->num_queue_pairs; + + return vsi->tx_rings[txq]; +} /** * i40e_lan_xmit_frame - Selects the correct VSI and Tx queue to send buffer * @skb: send buffer @@ -3019,7 +3029,6 @@ netdev_tx_t i40e_lan_xmit_frame(struct sk_buff *skb, struct net_device *netdev) { struct i40e_netdev_priv *np = netdev_priv(netdev); struct i40e_vsi *vsi = np->vsi; - struct i40e_ring *tx_ring = vsi->tx_rings[skb->queue_mapping]; /* hardware can't handle really short frames, hardware padding works * beyond this point @@ -3027,5 +3036,5 @@ netdev_tx_t i40e_lan_xmit_frame(struct sk_buff *skb, struct net_device *netdev) if (skb_put_padto(skb, I40E_MIN_TX_LEN)) return NETDEV_TX_OK; - return i40e_xmit_frame_ring(skb, tx_ring); + return i40e_xmit_frame_ring(skb, i40e_get_txq(vsi, skb)); } -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Tushar Dave <tushar.n.dave@oracle.com> To: intel-wired-lan@osuosl.org Subject: [Intel-wired-lan] [PATCH] i40e: Check for skb->queue_mapping Date: Wed, 29 Mar 2017 16:57:54 -0700 [thread overview] Message-ID: <1490831874-6396-1-git-send-email-tushar.n.dave@oracle.com> (raw) There are events seen where skb->queue_mapping value is greater than vsi->num_queue_pairs. In such cases, vsi->tx_ring becomes invalid (null) and xmit results in kernel panic. One such event is running netconsole and enabling VF on the same device. Or running netconsole and changing number of tx queues via ethtool on same device. This patch adds check for skb->queue_mapping and uses simple arithmetic to select available tx queue from driver. Signed-off-by: Tushar Dave <tushar.n.dave@oracle.com> --- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c index 97d4605..af73675 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c @@ -3008,6 +3008,16 @@ static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb, return NETDEV_TX_OK; } +static inline struct i40e_ring *i40e_get_txq(struct i40e_vsi *vsi, + struct sk_buff *skb) +{ + unsigned int txq = skb->queue_mapping; + + if (txq >= vsi->num_queue_pairs) + txq = txq % vsi->num_queue_pairs; + + return vsi->tx_rings[txq]; +} /** * i40e_lan_xmit_frame - Selects the correct VSI and Tx queue to send buffer * @skb: send buffer @@ -3019,7 +3029,6 @@ netdev_tx_t i40e_lan_xmit_frame(struct sk_buff *skb, struct net_device *netdev) { struct i40e_netdev_priv *np = netdev_priv(netdev); struct i40e_vsi *vsi = np->vsi; - struct i40e_ring *tx_ring = vsi->tx_rings[skb->queue_mapping]; /* hardware can't handle really short frames, hardware padding works * beyond this point @@ -3027,5 +3036,5 @@ netdev_tx_t i40e_lan_xmit_frame(struct sk_buff *skb, struct net_device *netdev) if (skb_put_padto(skb, I40E_MIN_TX_LEN)) return NETDEV_TX_OK; - return i40e_xmit_frame_ring(skb, tx_ring); + return i40e_xmit_frame_ring(skb, i40e_get_txq(vsi, skb)); } -- 1.9.1
next reply other threads:[~2017-03-30 0:01 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-03-29 23:57 Tushar Dave [this message] 2017-03-29 23:57 ` [Intel-wired-lan] [PATCH] i40e: Check for skb->queue_mapping Tushar Dave 2017-03-30 0:31 ` Eric Dumazet 2017-03-30 0:31 ` [Intel-wired-lan] " Eric Dumazet
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=1490831874-6396-1-git-send-email-tushar.n.dave@oracle.com \ --to=tushar.n.dave@oracle.com \ --cc=intel-wired-lan@lists.osuosl.org \ --cc=jeffrey.t.kirsher@intel.com \ --cc=netdev@vger.kernel.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.