diff options
Diffstat (limited to 'drivers/net/ixgbe/ixgbe_fcoe.c')
| -rw-r--r-- | drivers/net/ixgbe/ixgbe_fcoe.c | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/drivers/net/ixgbe/ixgbe_fcoe.c b/drivers/net/ixgbe/ixgbe_fcoe.c index e20facd1f2df..a11c6207b748 100644 --- a/drivers/net/ixgbe/ixgbe_fcoe.c +++ b/drivers/net/ixgbe/ixgbe_fcoe.c @@ -36,6 +36,311 @@ #include <scsi/libfcoe.h> /** + * ixgbe_rx_is_fcoe - check the rx desc for incoming pkt type + * @rx_desc: advanced rx descriptor + * + * Returns : true if it is FCoE pkt + */ +static inline bool ixgbe_rx_is_fcoe(union ixgbe_adv_rx_desc *rx_desc) +{ + u16 p; + + p = le16_to_cpu(rx_desc->wb.lower.lo_dword.hs_rss.pkt_info); + if (p & IXGBE_RXDADV_PKTTYPE_ETQF) { + p &= IXGBE_RXDADV_PKTTYPE_ETQF_MASK; + p >>= IXGBE_RXDADV_PKTTYPE_ETQF_SHIFT; + return p == IXGBE_ETQF_FILTER_FCOE; + } + return false; +} + +/** + * ixgbe_fcoe_clear_ddp - clear the given ddp context + * @ddp - ptr to the ixgbe_fcoe_ddp + * + * Returns : none + * + */ +static inline void ixgbe_fcoe_clear_ddp(struct ixgbe_fcoe_ddp *ddp) +{ + ddp->len = 0; + ddp->err = 0; + ddp->udl = NULL; + ddp->udp = 0UL; + ddp->sgl = NULL; + ddp->sgc = 0; +} + +/** + * ixgbe_fcoe_ddp_put - free the ddp context for a given xid + * @netdev: the corresponding net_device + * @xid: the xid that corresponding ddp will be freed + * + * This is the implementation of net_device_ops.ndo_fcoe_ddp_done + * and it is expected to be called by ULD, i.e., FCP layer of libfc + * to release the corresponding ddp context when the I/O is done. + * + * Returns : data length already ddp-ed in bytes + */ +int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid) +{ + int len = 0; + struct ixgbe_fcoe *fcoe; + struct ixgbe_adapter *adapter; + struct ixgbe_fcoe_ddp *ddp; + + if (!netdev) + goto out_ddp_put; + + if (xid >= IXGBE_FCOE_DDP_MAX) + goto out_ddp_put; + + adapter = netdev_priv(netdev); + fcoe = &adapter->fcoe; + ddp = &fcoe->ddp[xid]; + if (!ddp->udl) + goto out_ddp_put; + + len = ddp->len; + /* if there an error, force to invalidate ddp context */ + if (ddp->err) { + spin_lock_bh(&fcoe->lock); + IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLT, 0); + IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLTRW, + (xid | IXGBE_FCFLTRW_WE)); + IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCBUFF, 0); + IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW, + (xid | IXGBE_FCDMARW_WE)); + spin_unlock_bh(&fcoe->lock); + } + if (ddp->sgl) + pci_unmap_sg(adapter->pdev, ddp->sgl, ddp->sgc, + DMA_FROM_DEVICE); + pci_pool_free(fcoe->pool, ddp->udl, ddp->udp); + ixgbe_fcoe_clear_ddp(ddp); + +out_ddp_put: + return len; +} + +/** + * ixgbe_fcoe_ddp_get - called to set up ddp context + * @netdev: the corresponding net_device + * @xid: the exchange id requesting ddp + * @sgl: the scatter-gather list for this request + * @sgc: the number of scatter-gather items + * + * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup + * and is expected to be called from ULD, e.g., FCP layer of libfc + * to set up ddp for the corresponding xid of the given sglist for + * the corresponding I/O. + * + * Returns : 1 for success and 0 for no ddp + */ +int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid, + struct scatterlist *sgl, unsigned int sgc) +{ + struct ixgbe_adapter *adapter; + struct ixgbe_hw *hw; + struct ixgbe_fcoe *fcoe; + struct ixgbe_fcoe_ddp *ddp; + struct scatterlist *sg; + unsigned int i, j, dmacount; + unsigned int len; + static const unsigned int bufflen = 4096; + unsigned int firstoff = 0; + unsigned int lastsize; + unsigned int thisoff = 0; + unsigned int thislen = 0; + u32 fcbuff, fcdmarw, fcfltrw; + dma_addr_t addr; + + if (!netdev || !sgl) + return 0; + + adapter = netdev_priv(netdev); + if (xid >= IXGBE_FCOE_DDP_MAX) { + DPRINTK(DRV, WARNING, "xid=0x%x out-of-range\n", xid); + return 0; + } + + fcoe = &adapter->fcoe; + if (!fcoe->pool) { + DPRINTK(DRV, WARNING, "xid=0x%x no ddp pool for fcoe\n", xid); + return 0; + } + + ddp = &fcoe->ddp[xid]; + if (ddp->sgl) { + DPRINTK(DRV, ERR, "xid 0x%x w/ non-null sgl=%p nents=%d\n", + xid, ddp->sgl, ddp->sgc); + return 0; + } + ixgbe_fcoe_clear_ddp(ddp); + + /* setup dma from scsi command sgl */ + dmacount = pci_map_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE); + if (dmacount == 0) { + DPRINTK(DRV, ERR, "xid 0x%x DMA map error\n", xid); + return 0; + } + + /* alloc the udl from our ddp pool */ + ddp->udl = pci_pool_alloc(fcoe->pool, GFP_KERNEL, &ddp->udp); + if (!ddp->udl) { + DPRINTK(DRV, ERR, "failed allocated ddp context\n"); + goto out_noddp_unmap; + } + ddp->sgl = sgl; + ddp->sgc = sgc; + + j = 0; + for_each_sg(sgl, sg, dmacount, i) { + addr = sg_dma_address(sg); + len = sg_dma_len(sg); + while (len) { + /* get the offset of length of current buffer */ + thisoff = addr & ((dma_addr_t)bufflen - 1); + thislen = min((bufflen - thisoff), len); + /* + * all but the 1st buffer (j == 0) + * must be aligned on bufflen + */ + if ((j != 0) && (thisoff)) + goto out_noddp_free; + /* + * all but the last buffer + * ((i == (dmacount - 1)) && (thislen == len)) + * must end at bufflen + */ + if (((i != (dmacount - 1)) || (thislen != len)) + && ((thislen + thisoff) != bufflen)) + goto out_noddp_free; + + ddp->udl[j] = (u64)(addr - thisoff); + /* only the first buffer may have none-zero offset */ + if (j == 0) + firstoff = thisoff; + len -= thislen; + addr += thislen; + j++; + /* max number of buffers allowed in one DDP context */ + if (j > IXGBE_BUFFCNT_MAX) { + DPRINTK(DRV, ERR, "xid=%x:%d,%d,%d:addr=%llx " + "not enough descriptors\n", + xid, i, j, dmacount, (u64)addr); + goto out_noddp_free; + } + } + } + /* only the last buffer may have non-full bufflen */ + lastsize = thisoff + thislen; + + fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT); + fcbuff |= (j << IXGBE_FCBUFF_BUFFCNT_SHIFT); + fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT); + fcbuff |= (IXGBE_FCBUFF_VALID); + + fcdmarw = xid; + fcdmarw |= IXGBE_FCDMARW_WE; + fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT); + + fcfltrw = xid; + fcfltrw |= IXGBE_FCFLTRW_WE; + + /* program DMA context */ + hw = &adapter->hw; + spin_lock_bh(&fcoe->lock); + IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_32BIT_MASK); + IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32); + IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff); + IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw); + /* program filter context */ + IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0); + IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID); + IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw); + spin_unlock_bh(&fcoe->lock); + + return 1; + +out_noddp_free: + pci_pool_free(fcoe->pool, ddp->udl, ddp->udp); + ixgbe_fcoe_clear_ddp(ddp); + +out_noddp_unmap: + pci_unmap_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE); + return 0; +} + +/** + * ixgbe_fcoe_ddp - check ddp status and mark it done + * @adapter: ixgbe adapter + * @rx_desc: advanced rx descriptor + * @skb: the skb holding the received data + * + * This checks ddp status. + * + * Returns : 0 for success and skb will not be delivered to ULD + */ +int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter, + union ixgbe_adv_rx_desc *rx_desc, + struct sk_buff *skb) +{ + u16 xid; + u32 sterr, fceofe, fcerr, fcstat; + int rc = -EINVAL; + struct ixgbe_fcoe *fcoe; + struct ixgbe_fcoe_ddp *ddp; + struct fc_frame_header *fh; + + if (!ixgbe_rx_is_fcoe(rx_desc)) + goto ddp_out; + + skb->ip_summed = CHECKSUM_UNNECESSARY; + sterr = le32_to_cpu(rx_desc->wb.upper.status_error); + fcerr = (sterr & IXGBE_RXDADV_ERR_FCERR); + fceofe = (sterr & IXGBE_RXDADV_ERR_FCEOFE); + if (fcerr == IXGBE_FCERR_BADCRC) + skb->ip_summed = CHECKSUM_NONE; + + skb_reset_network_header(skb); + skb_set_transport_header(skb, skb_network_offset(skb) + + sizeof(struct fcoe_hdr)); + fh = (struct fc_frame_header *)skb_transport_header(skb); + xid = be16_to_cpu(fh->fh_ox_id); + if (xid >= IXGBE_FCOE_DDP_MAX) + goto ddp_out; + + fcoe = &adapter->fcoe; + ddp = &fcoe->ddp[xid]; + if (!ddp->udl) + goto ddp_out; + + ddp->err = (fcerr | fceofe); + if (ddp->err) + goto ddp_out; + + fcstat = (sterr & IXGBE_RXDADV_STAT_FCSTAT); + if (fcstat) { + /* update length of DDPed data */ + ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss); + /* unmap the sg list when FCP_RSP is received */ + if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_FCPRSP) { + pci_unmap_sg(adapter->pdev, ddp->sgl, + ddp->sgc, DMA_FROM_DEVICE); + ddp->sgl = NULL; + ddp->sgc = 0; + } + /* return 0 to bypass going to ULD for DDPed data */ + if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_DDP) + rc = 0; + } + +ddp_out: + return rc; +} + +/** * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO) * @adapter: ixgbe adapter * @tx_ring: tx desc ring @@ -178,7 +483,20 @@ int ixgbe_fso(struct ixgbe_adapter *adapter, void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter) { struct ixgbe_hw *hw = &adapter->hw; + struct ixgbe_fcoe *fcoe = &adapter->fcoe; + + /* create the pool for ddp if not created yet */ + if (!fcoe->pool) { + /* allocate ddp pool */ + fcoe->pool = pci_pool_create("ixgbe_fcoe_ddp", + adapter->pdev, IXGBE_FCPTR_MAX, + IXGBE_FCPTR_ALIGN, PAGE_SIZE); + if (!fcoe->pool) + DPRINTK(DRV, ERR, + "failed to allocated FCoE DDP pool\n"); + spin_lock_init(&fcoe->lock); + } /* L2 filter for FCoE: default to queue 0 */ IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE), (ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN)); @@ -190,3 +508,25 @@ void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter) IXGBE_FCRXCTRL_FCCRCBO | (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT)); } + +/** + * ixgbe_cleanup_fcoe - release all fcoe ddp context resources + * @adapter : ixgbe adapter + * + * Cleans up outstanding ddp context resources + * + * Returns : none + */ +void ixgbe_cleanup_fcoe(struct ixgbe_adapter *adapter) +{ + int i; + struct ixgbe_fcoe *fcoe = &adapter->fcoe; + + /* release ddp resource */ + if (fcoe->pool) { + for (i = 0; i < IXGBE_FCOE_DDP_MAX; i++) + ixgbe_fcoe_ddp_put(adapter->netdev, i); + pci_pool_destroy(fcoe->pool); + fcoe->pool = NULL; + } +} |
