From: "Dupuis, Chad" <chad.dupuis@xxxxxxxxxx>
This patch adds handling for FIP requests and responses that are handled by
the driver itself and not by libfcoe.
Signed-off-by: Nilesh Javali <nilesh.javali@xxxxxxxxxx>
Signed-off-by: Manish Rangankar <manish.rangankar@xxxxxxxxxx>
Signed-off-by: Saurav Kashyap <saurav.kashyap@xxxxxxxxxx>
Signed-off-by: Chad Dupuis <chad.dupuis@xxxxxxxxxx>
---
drivers/scsi/qedf/qedf_fip.c | 267 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 267 insertions(+)
create mode 100644 drivers/scsi/qedf/qedf_fip.c
diff --git a/drivers/scsi/qedf/qedf_fip.c b/drivers/scsi/qedf/qedf_fip.c
new file mode 100644
index 0000000..4f185c6
--- /dev/null
+++ b/drivers/scsi/qedf/qedf_fip.c
@@ -0,0 +1,267 @@
+/*
+ * QLogic FCoE Offload Driver
+ * Copyright (c) 2016 Cavium Inc.
+ *
+ * This software is available under the terms of the GNU General Public License
+ * (GPL) Version 2, available from the file COPYING in the main directory of
+ * this source tree.
+ */
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include "qedf.h"
+
+extern const struct qed_fcoe_ops *qed_ops;
+/*
+ * FIP VLAN functions that will eventually move to libfcoe.
+ */
+
+void qedf_fcoe_send_vlan_req(struct qedf_ctx *qedf)
+{
+ struct sk_buff *skb;
+ char *eth_fr;
+ int fr_len;
+ struct fip_vlan *vlan;
+#define MY_FIP_ALL_FCF_MACS ((__u8[6]) { 1, 0x10, 0x18, 1, 0, 2 })
+ static u8 my_fcoe_all_fcfs[ETH_ALEN] = MY_FIP_ALL_FCF_MACS;
+
+ skb = dev_alloc_skb(sizeof(struct fip_vlan));
+ if (!skb)
+ return;
+
+ fr_len = sizeof(*vlan);
+ eth_fr = (char *)skb->data;
+ vlan = (struct fip_vlan *)eth_fr;
+
+ memset(vlan, 0, sizeof(*vlan));
+ ether_addr_copy(vlan->eth.h_source, qedf->mac);
+ ether_addr_copy(vlan->eth.h_dest, my_fcoe_all_fcfs);
+ vlan->eth.h_proto = htons(ETH_P_FIP);
+
+ vlan->fip.fip_ver = FIP_VER_ENCAPS(FIP_VER);
+ vlan->fip.fip_op = htons(FIP_OP_VLAN);
+ vlan->fip.fip_subcode = FIP_SC_VL_REQ;
+ vlan->fip.fip_dl_len = htons(sizeof(vlan->desc) / FIP_BPW);
+
+ vlan->desc.mac.fd_desc.fip_dtype = FIP_DT_MAC;
+ vlan->desc.mac.fd_desc.fip_dlen = sizeof(vlan->desc.mac) / FIP_BPW;
+ ether_addr_copy(vlan->desc.mac.fd_mac, qedf->mac);
+
+ vlan->desc.wwnn.fd_desc.fip_dtype = FIP_DT_NAME;
+ vlan->desc.wwnn.fd_desc.fip_dlen = sizeof(vlan->desc.wwnn) / FIP_BPW;
+ put_unaligned_be64(qedf->lport->wwnn, &vlan->desc.wwnn.fd_wwn);
+
+ skb_put(skb, sizeof(*vlan));
+ skb->protocol = htons(ETH_P_FIP);
+ skb_reset_mac_header(skb);
+ skb_reset_network_header(skb);
+
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Sending FIP VLAN "
+ "request.");
+
+ if (atomic_read(&qedf->link_state) != QEDF_LINK_UP) {
+ QEDF_WARN(&(qedf->dbg_ctx), "Cannot send vlan request "
+ "because link is not up.\n");
+
+ kfree_skb(skb);
+ return;
+ }
+ qed_ops->ll2->start_xmit(qedf->cdev, skb);
+}
+
+static void qedf_fcoe_process_vlan_resp(struct qedf_ctx *qedf,
+ struct sk_buff *skb)
+{
+ struct fip_header *fiph;
+ struct fip_desc *desc;
+ u16 vid = 0;
+ ssize_t rlen;
+ size_t dlen;
+
+ fiph = (struct fip_header *)(((void *)skb->data) + 2 * ETH_ALEN + 2);
+
+ rlen = ntohs(fiph->fip_dl_len) * 4;
+ desc = (struct fip_desc *)(fiph + 1);
+ while (rlen > 0) {
+ dlen = desc->fip_dlen * FIP_BPW;
+ switch (desc->fip_dtype) {
+ case FIP_DT_VLAN:
+ vid = ntohs(((struct fip_vlan_desc *)desc)->fd_vlan);
+ break;
+ }
+ desc = (struct fip_desc *)((char *)desc + dlen);
+ rlen -= dlen;
+ }
+
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "VLAN response, "
+ "vid=0x%x.\n", vid);
+
+ if (vid > 0 && qedf->vlan_id != vid) {
+ qedf_set_vlan_id(qedf, vid);
+
+ /* Inform waiter that it's ok to call fcoe_ctlr_link up() */
+ complete(&qedf->fipvlan_compl);
+ }
+}
+
+void qedf_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
+{
+ struct qedf_ctx *qedf = container_of(fip, struct qedf_ctx, ctlr);
+ struct ethhdr *eth_hdr;
+ struct vlan_ethhdr *vlan_hdr;
+ struct fip_header *fiph;
+ u16 op, vlan_tci = 0;
+ u8 sub;
+
+ if (!test_bit(QEDF_LL2_STARTED, &qedf->flags)) {
+ QEDF_WARN(&(qedf->dbg_ctx), "LL2 not started\n");
+ kfree_skb(skb);
+ return;
+ }
+
+ fiph = (struct fip_header *) ((void *)skb->data + 2 * ETH_ALEN + 2);
+ eth_hdr = (struct ethhdr *)skb_mac_header(skb);
+ op = ntohs(fiph->fip_op);
+ sub = fiph->fip_subcode;
+
+ if (!qedf->vlan_hw_insert) {
+ vlan_hdr = (struct vlan_ethhdr *)skb_push(skb, sizeof(*vlan_hdr)
+ - sizeof(*eth_hdr));
+ memcpy(vlan_hdr, eth_hdr, 2 * ETH_ALEN);
+ vlan_hdr->h_vlan_proto = htons(ETH_P_8021Q);
+ vlan_hdr->h_vlan_encapsulated_proto = eth_hdr->h_proto;
+ vlan_hdr->h_vlan_TCI = vlan_tci = htons(qedf->vlan_id);
+ }
+
+ /* Update eth_hdr since we added a VLAN tag */
+ eth_hdr = (struct ethhdr *)skb_mac_header(skb);
+
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, "FIP frame send: "
+ "dest=%pM op=%x sub=%x vlan=%04x.", eth_hdr->h_dest, op, sub,
+ ntohs(vlan_tci));
+ if (qedf_dump_frames)
+ print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1,
+ skb->data, skb->len, false);
+
+ qed_ops->ll2->start_xmit(qedf->cdev, skb);
+}
+
+/* Process incoming FIP frames. */
+void qedf_fip_recv(struct qedf_ctx *qedf, struct sk_buff *skb)
+{
+ struct ethhdr *eth_hdr;
+ struct fip_header *fiph;
+ struct fip_desc *desc;
+ struct fip_mac_desc *mp;
+ struct fip_wwn_desc *wp;
+ struct fip_vn_desc *vp;
+ size_t rlen, dlen;
+ uint32_t cvl_port_id;
+ __u8 cvl_mac[ETH_ALEN];
+ u16 op;
+ u8 sub;
+
+ eth_hdr = (struct ethhdr *)skb_mac_header(skb);
+ fiph = (struct fip_header *) ((void *)skb->data + 2 * ETH_ALEN + 2);
+ op = ntohs(fiph->fip_op);
+ sub = fiph->fip_subcode;
+
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2, "FIP frame received: "
+ "skb=%p fiph=%p source=%pM op=%x sub=%x", skb, fiph,
+ eth_hdr->h_source, op, sub);
+ if (qedf_dump_frames)
+ print_hex_dump(KERN_WARNING, "fip ", DUMP_PREFIX_OFFSET, 16, 1,
+ skb->data, skb->len, false);
+
+ /* Handle FIP VLAN resp in the driver */
+ if (op == FIP_OP_VLAN && sub == FIP_SC_VL_NOTE) {
+ qedf_fcoe_process_vlan_resp(qedf, skb);
+ qedf->vlan_hw_insert = 0;
+ } else if (op == FIP_OP_CTRL && sub == FIP_SC_CLR_VLINK) {
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Clear virtual "
+ "link received.\n");
+
+ /* Check that an FCF has been selected by fcoe */
+ if (qedf->ctlr.sel_fcf == NULL) {
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
+ "Dropping CVL since FCF has not been selected "
+ "yet.");
+ return;
+ }
+
+ cvl_port_id = 0;
+ memset(cvl_mac, 0, ETH_ALEN);
+ /*
+ * We need to loop through the CVL descriptors to determine
+ * if we want to reset the fcoe link
+ */
+ rlen = ntohs(fiph->fip_dl_len) * FIP_BPW;
+ desc = (struct fip_desc *)(fiph + 1);
+ while (rlen >= sizeof(*desc)) {
+ dlen = desc->fip_dlen * FIP_BPW;
+ switch (desc->fip_dtype) {
+ case FIP_DT_MAC:
+ mp = (struct fip_mac_desc *)desc;
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
+ "fd_mac=%pM.\n", __func__, mp->fd_mac);
+ ether_addr_copy(cvl_mac, mp->fd_mac);
+ break;
+ case FIP_DT_NAME:
+ wp = (struct fip_wwn_desc *)desc;
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
+ "fc_wwpn=%016llx.\n",
+ get_unaligned_be64(&wp->fd_wwn));
+ break;
+ case FIP_DT_VN_ID:
+ vp = (struct fip_vn_desc *)desc;
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
+ "fd_fc_id=%x.\n", ntoh24(vp->fd_fc_id));
+ cvl_port_id = ntoh24(vp->fd_fc_id);
+ break;
+ default:
+ /* Ignore anything else */
+ break;
+ }
+ desc = (struct fip_desc *)((char *)desc + dlen);
+ rlen -= dlen;
+ }
+
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_LL2,
+ "cvl_port_id=%06x cvl_mac=%pM.\n", cvl_port_id,
+ cvl_mac);
+ if (cvl_port_id == qedf->lport->port_id &&
+ ether_addr_equal(cvl_mac,
+ qedf->ctlr.sel_fcf->fcf_mac)) {
+ fcoe_ctlr_link_down(&qedf->ctlr);
+ qedf_wait_for_upload(qedf);
+ fcoe_ctlr_link_up(&qedf->ctlr);
+ }
+ } else {
+ /* Everything else is handled by libfcoe */
+ __skb_pull(skb, ETH_HLEN);
+ fcoe_ctlr_recv(&qedf->ctlr, skb);
+ }
+}
+
+void qedf_update_src_mac(struct fc_lport *lport, u8 *addr)
+{
+ struct qedf_ctx *qedf = lport_priv(lport);
+
+ QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
+ "Setting data_src_addr=%pM.\n", addr);
+ ether_addr_copy(qedf->data_src_addr, addr);
+}
+
+u8 *qedf_get_src_mac(struct fc_lport *lport)
+{
+ u8 mac[ETH_ALEN];
+ u8 port_id[3];
+ struct qedf_ctx *qedf = lport_priv(lport);
+
+ /* We need to use the lport port_id to create the data_src_addr */
+ if (is_zero_ether_addr(qedf->data_src_addr)) {
+ hton24(port_id, lport->port_id);
+ fc_fcoe_set_mac(mac, port_id);
+ qedf->ctlr.update_mac(lport, mac);
+ }
+ return qedf->data_src_addr;
+}
--
1.8.5.6
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