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igb: Limit maximum frame Rx based on MTU

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In order to support the use of build_skb going forward it will be necessary
to place a maximum limit on the amount of data we can receive when jumbo
frames is not enabled.  In order to do this I am adding a new upper limit
for receive based on the size of a 2K buffer minus padding.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2017-02-06 18:26:15 -08:00 • committed by Jeff Kirsher
parent 7cc6fd4c60
commit cfbc871c21
2 changed files with 26 additions and 5 deletions
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10
drivers/net/ethernet/intel/igb/igb.h
View file

@ -143,8 +143,17 @@ struct vf_data_storage {
#define IGB_RXBUFFER_256 256
#define IGB_RXBUFFER_2048 2048
#define IGB_RX_HDR_LEN IGB_RXBUFFER_256
#define IGB_TS_HDR_LEN 16
#define IGB_RX_BUFSZ IGB_RXBUFFER_2048
#define IGB_SKB_PAD (NET_SKB_PAD + NET_IP_ALIGN)
#if (PAGE_SIZE < 8192)
#define IGB_MAX_FRAME_BUILD_SKB \
(SKB_WITH_OVERHEAD(IGB_RXBUFFER_2048) - IGB_SKB_PAD - IGB_TS_HDR_LEN)
#else
#define IGB_MAX_FRAME_BUILD_SKB (IGB_RXBUFFER_2048 - IGB_TS_HDR_LEN)
#endif
/* How many Rx Buffers do we bundle into one write to the hardware ? */
#define IGB_RX_BUFFER_WRITE 16 /* Must be power of 2 */
@ -561,7 +570,6 @@ struct igb_adapter {
#define IGB_DMCTLX_DCFLUSH_DIS 0x80000000 /* Disable DMA Coal Flush */
#define IGB_82576_TSYNC_SHIFT 19
#define IGB_TS_HDR_LEN 16
enum e1000_state_t {
__IGB_TESTING,
__IGB_RESETTING,

21
drivers/net/ethernet/intel/igb/igb_main.c
View file

@ -4250,7 +4250,7 @@ static void igb_set_rx_mode(struct net_device *netdev)
struct igb_adapter *adapter = netdev_priv(netdev);
struct e1000_hw *hw = &adapter->hw;
unsigned int vfn = adapter->vfs_allocated_count;
u32 rctl = 0, vmolr = 0;
u32 rctl = 0, vmolr = 0, rlpml = MAX_JUMBO_FRAME_SIZE;
int count;
/* Check for Promiscuous and All Multicast modes */
@ -4308,6 +4308,14 @@ static void igb_set_rx_mode(struct net_device *netdev)
E1000_RCTL_VFE);
wr32(E1000_RCTL, rctl);
#if (PAGE_SIZE < 8192)
if (!adapter->vfs_allocated_count) {
if (adapter->max_frame_size <= IGB_MAX_FRAME_BUILD_SKB)
rlpml = IGB_MAX_FRAME_BUILD_SKB;
}
#endif
wr32(E1000_RLPML, rlpml);
/* In order to support SR-IOV and eventually VMDq it is necessary to set
* the VMOLR to enable the appropriate modes. Without this workaround
* we will have issues with VLAN tag stripping not being done for frames
@ -4322,12 +4330,17 @@ static void igb_set_rx_mode(struct net_device *netdev)
vmolr |= rd32(E1000_VMOLR(vfn)) &
~(E1000_VMOLR_ROPE | E1000_VMOLR_MPME | E1000_VMOLR_ROMPE);
/* enable Rx jumbo frames, no need for restriction */
/* enable Rx jumbo frames, restrict as needed to support build_skb */
vmolr &= ~E1000_VMOLR_RLPML_MASK;
vmolr |= MAX_JUMBO_FRAME_SIZE | E1000_VMOLR_LPE;
#if (PAGE_SIZE < 8192)
if (adapter->max_frame_size <= IGB_MAX_FRAME_BUILD_SKB)
vmolr |= IGB_MAX_FRAME_BUILD_SKB;
else
#endif
vmolr |= MAX_JUMBO_FRAME_SIZE;
vmolr |= E1000_VMOLR_LPE;
wr32(E1000_VMOLR(vfn), vmolr);
wr32(E1000_RLPML, MAX_JUMBO_FRAME_SIZE);
igb_restore_vf_multicasts(adapter);
}